Multi-Regional Delta-Tracking Method for Neutron Transport Tracking in Monte Carlo Criticality Calculation
作者：
Guo, Qian;Chen, Zhenping*
期刊：
Sustainability ,2018年10(7) ISSN：2071-1050
通讯作者：
Chen, Zhenping
作者机构：
[Guo, Qian] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Chen, Zhenping] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Chen, Zhenping] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
Monte Carlo;neutron tracking;multi-regional;delta-tracking;criticality calculation
摘要：
The Monte Carlo method has been widely used as a standard method to perform neutron transport simulations in reactor physics. In conventional Monte Carlo codes corresponding to the neutron transport tracking with ray-tracing method, the distances to material boundaries must be computed frequently when the neutron changes its kinetic energy or moving into new material regions to determine the neutron transport length. However, if the neutron's mean free path length, to some extent, is greater than the macro size of the model, a huge amount of distances need to be computed. As a result, the computational efficiency of the neutron transport tracking will be degraded. An improved multi-regional delta-tracking method based on domain decomposition was introduced to solve this problem, in which the original heterogeneous model would be decomposed into many sub-regions and each sub-region was tracked using a local delta-tracking method. Consequently, the computational efficiency of the neutron transport tracking can be improved theoretically without the unnecessary distance calculations. The improved multi-regional delta-tracking method was incorporated into the MOSRT system, which is a multi-objective modeling and simulation platform for radiation transport system. Finally, the method was validated using the criticality benchmarks and its accuracy and efficiency were demonstrated in Monte Carlo criticality calculation. The results indicated that the new method was consistent with the conventional methods, but with a more competitive run-time performance. © 2018 by the authors.
语种：
英文
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Preparation of a Phosphate-Modified Flower-Like alpha-FeOOH Composite and Its Application for Aqueous U(VI) Removal
作者：
Zhang, Xiaowen* ;Jiang, Tianjiao;Xie, Chao;Peng, Ying;Li, Mi;...
期刊：
WATER AIR AND SOIL POLLUTION ,2018年229(3):1-11 ISSN：0049-6979
通讯作者：
Zhang, Xiaowen
作者机构：
[Li, Mi; Zhong, Yongming; Zhang, Xiaowen] Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Hunan, Peoples R China.;[Peng, Ying; Xie, Chao; Jiang, Tianjiao] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Zhang, Xiaowen] U;Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Hunan, Peoples R China.
关键词：
Uranium;α-FeOOH;Phosphate;Sorption;Mechanism
摘要：
AbstractGoethite is a stable and widespread mineral in soil, which affects the transportation and immobilization of heavy metals in soil. Here, the three-dimensional flower-like goethite (TDFLG) was synthesized by refluxing precipitation method. The modified three-dimensional flower-like goethite (MTDFLG) was prepared by NaH2PO4 with dipping method. The obtained samples were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) analysis, N2 adsorption–desorption (BET), and X-ray diffraction (XRD). SEM images showed that the modification of phosphate had no major changes on the morphology of the original sample and the morphology of MTDFLG after adsorbed U(VI) had clearly change. For the goethite and modified goethite, the BET-specific surface area was 229.96 and 203.17m2/g, respectively. Moreover, the effects of adsorption time, sorbent dose, solution pH, and initial uranium concentration on the uranium adsorption behaviors were investigated using the two materials as adsorbent for the treatment of uranium-containing wastewater. The results showed that MTDFLG had better adsorption capacity than TDFLG on uranium. The increase in uranium removal on MTDFLG was due to the formation of ternary surface complexes (≡FePO4UO2). TDFLG and MTDFLG followed the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model, which indicated that uranium adsorption on TDFLG or MTDFLG is mainly based on chemisorption, and the maximum adsorption capacity of two adsorbents is 48.24 and 112.36mg/g, respectively.
语种：
英文
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High efficiency microwave-assisted synthesis of quinoline from acrolein diethyl acetal and aniline utilizing Ni/Beta catalyst
作者：
Li, An;Yang, Zan;Yang, Tao;Luo, Cai-Wu;Chao, Zi-Sheng* ;...
期刊：
Catalysis Communications ,2018年115:21-25 ISSN：1566-7367
通讯作者：
Zhou, Cong-Shan;Chao, Zi-Sheng
作者机构：
[Li, An; Yang, Tao; Zhou, Cong-Shan; Yang, Zan] Hunan Inst Sci & Technol, Coll Chem & Chem Engn, Yueyang 414000, Peoples R China.;[Luo, Cai-Wu] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Chao, Zi-Sheng] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.
通讯机构：
[Zhou, Cong-Shan] H;[Chao, Zi-Sheng] C;Hunan Inst Sci & Technol, Coll Chem & Chem Engn, Yueyang 414000, Peoples R China.;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.
关键词：
Acrolein diethyl acetal;Beta zeolite;Microwave-assisted;Quinolines
摘要：
A facile and solvent-free microwave-assisted approach to quinoline was developed by utilizing both acrolein diethyl acetal and aniline as reagents, firstly employing Ni/Beta zeolite as mild, ecofriendly and low-cost solid catalyst. As high as 83% yield of quinoline was quickly achieved at a short microwave time. The results indicated that the effect of Ni on Beta zeolite not only significantly promoted conversion of acrolein diethyl acetal to effective intermediate but also dramatically accelerated dehydrogenation rate of tetrahydroquinoline/dihydroquinoline to quinoline. © 2018 Elsevier B.V.
语种：
英文
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Preparation of hydrogel beads based on sodium alginate and aqueous extract from pomegranate peel and its cyanobacteria removal performance
作者：
Wang, Hongqiang;Zhang, Lieyu*
期刊：
ENVIRONMENT PROTECTION ENGINEERING ,2018年44(2):159-167 ISSN：0324-8828
通讯作者：
Zhang, Lieyu
作者机构：
[Wang, Hongqiang] Univ South China, Sch Environm & Safety Engn, Changsheng West Rd, Hengyang City 421001, Hunan, Peoples R China.;[Zhang, Lieyu] Chinese Res Inst Environm Sci, Lab Water Environm Syst Engn, Dayangfang Beiyuan Rd 8, Beijing 100012, Peoples R China.
通讯机构：
[Zhang, Lieyu] C;Chinese Res Inst Environm Sci, Lab Water Environm Syst Engn, Dayangfang Beiyuan Rd 8, Beijing 100012, Peoples R China.
摘要：
In recent years, harmful cyanobacterial blooms frequently occurred all over the world, causing great damage to ecosystems, fishery resources, and recreational facilities. Therefore, the removal of harmful cyanobacterial blooms is a crucial step for the maintenance of safe water supplies and for the safety of aquatic products. Hydrogel beads based on sodium alginate and an aqueous extract from pomegranate peel were prepared, and used for removing Microcystin aeruginosa. The removal efficiencies of hydrogel beads to M. Aeruginosa and the factors affecting its removal from solutions (the ratio of material to solvent, the dosage of hydrogel beads, and the density of M. Aeruginosa cells) were investigated. The optimum ratio of material to solvent, the dosage of hydrogel beads and the density of M aeruginosa cells were 0.03 g/cm, 100 g/dm and less than 8.68 106 cells/cm, respectively. When the density of M. Aeruginosa cells was below 8.68 106cells/cm, the removal efficiency of cyanobac-teria was above 99.21% at the dose of 100 g/dm. The pomegranate peel and sodium alginate, as natural materials, were safe and innocuous, providing simple operation, low cost and high availability. Therefore, the hydrogel beads offer favorable characteristics in M. Aeruginosa removal. © 2018 Technical University of Wroclaw. All rights reserved.
语种：
英文
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Healing multimodal confident information coverage holes in NB-IoT-enabled networks
作者：
Deng, Xianjun;Tang, Zujun;Yi, Lingzhi* ;Yang, Laurence T.
期刊：
IEEE INTERNET OF THINGS JOURNAL ,2018年5(3):1463-1473 ISSN：2327-4662
通讯作者：
Yi, Lingzhi
作者机构：
[Tang, Zujun; Deng, Xianjun] Univ South China, Dept Commun Engn, Hengyang 421001, Peoples R China.;[Yi, Lingzhi] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Yang, Laurence T.] St Francis Xavier Univ, Dept Comp Sci, Antigonish, NS B2G2W5, Canada.
通讯机构：
[Yi, Lingzhi] U;Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.
关键词：
Confident information coverage (CIC);hole healing;Internet of Things (IoT);narrowband IoT (NB-IoT)
摘要：
The Internet of Things (IoT) evolving from the conventional wireless sensor networks (WSNs) with more smart sensors has attracted significant attention. As one of the most crucial metrics for evaluating the quality of service (QoS) of both IoT and WSNs, sensing coverage characterizes the monitoring status of a sensing field of interest. However, the existence of coverage holes will remarkably degrade the QoS of the IoT. Based on the novel confident information coverage (CIC) model, this paper provides an in-depth study on how to energy-efficiently heal the multimodal CIC holes (MCICH) in a narrowband IoT (NB-IoT)-enabled hybrid IoT deployed for radiological pollution monitoring, where both mobile and stationary sensors equip multimodal sensing units for sensing dissimilar multimodal physical attributes and the NB-IoT provides satisfied network connectivity. We pinpoint the MCICH healing (MCICHH) problem with the objective of energy-efficiently dispatching a series of multimodal mobile IoT sensors to the CIC holes such that the MCIC holes can be headed and the CIC performance can be satisfied. After proving the NP-completeness of MCICHH by reducing it to the set partition problem, we develop a family of effective heuristic schemes including the centralized-MCICHH, the distributed-MCICHH and random CIC hole healing, all of which target for efficiently healing the MCIC holes while minimizing the total moving energy consumption of the dispatched multimodal mobile sensors or maximizing the average remaining energy of the multimodal mobile sensors. Extensive experiments verify the effectiveness and practicality of the proposed schemes. © 2017 IEEE.
语种：
英文
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Performance assessment of circular economy for phosphorus chemical firms based on VIKOR-QUALIFLEX method
作者：
Liang, Wei-zhang;Zhao, Guo-yan* ;Hong, Chang-shou
期刊：
Journal of Cleaner Production ,2018年196:1365-1378 ISSN：0959-6526
通讯作者：
Zhao, Guo-yan
作者机构：
[Liang, Wei-zhang; Zhao, Guo-yan] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.;[Hong, Chang-shou] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Zhao, Guo-yan] C;Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.
关键词：
Circular economy (CE);Phosphorus chemical firm (PCF);Performance evaluation;Vlsekriterijumska optimizacija I;kompromisno resenje (VIKOR) method;Qualitative flexible (QUALIFLEX) method;Linguistic neutrosophic number (LNN)
摘要：
Confronting the dilemma of resource shortage and environmental pollution, the idea of circular economy (CE) has attracted widespread attentions. To address these problems, several industrial companies have incorporated the CE in their operation or design. In this sense, the phosphorus chemical firms (PCFs) are promoting CE to achieve sustainable development goals since phosphorus is a non-renewable resource and one of the nutrient elements essential for crop growth. Thus, this paper aims to find a suitable way to assess the performance of CE for PCFs. Firstly, the evaluation index system of CE is designed according to the characteristics of CE for PCFs. Then, a new framework based on the qualitative flexible (QUALIFLEX) and Vlsekriterijumska Optimizacija I Kompromisno Resenje (VIKOR) methods is established to pick out the best enterprise. The linguistic neutrosophic number (LNN) is advised to describe decision making information with linguistic true, hesitant and false membership degree. Moreover, an entropy-based approach is used to determine the index weights, and the VIKOR method is presented to determine the concordance index. After that, all possible permutations are itemized, and the ranking result is obtained according to the general concordance index values of each permutation: Finally, an example of assessing the performance of CE for PCFs in China is given to illustrate the proposed method, and its feasibility is demonstrated. The robustness and advantage of this approach are also indicated with sensitivity and comparison analysis. The results show that the proposed VIKOR-QUALIFLEX method is reliable and stable for assessing the performance of CE for PCFs, and provides references for the construction and management of CE for PCFs. (C) 2018 Elsevier Ltd. All rights reserved.
语种：
英文
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Comparative study of Fisch-Boozer and Ohkawa current drive mechanisms for electron cyclotron waves
作者：
Zheng, P. W.;Gong, X. Y.* ;Lu, X. Q.;Cao, J. J.;He, L. H.;...
期刊：
PHYSICS OF PLASMAS ,2018年25(7):072501 ISSN：1070-664X
通讯作者：
Gong, X. Y.
作者机构：
[Huang, Q. H.; Deng, S.; Zheng, P. W.; He, L. H.; Cao, J. J.; Lin, J. F.; Gong, X. Y.; Lu, X. Q.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Zheng, P. W.] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Zhong, Y. J.] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Gong, X. Y.] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
plasma radiofrequency heating, plasma simulation, plasma toroidal confinement, tearing instability, Tokamak devices
摘要：
Localized current drive by electron cyclotron (EC) waves is of significant importance in the outer half region of tokamak plasmas. Using the coupled GENRAY/CQL3D suite codes, a systematic comparative study between Ohkawa current drive (OKCD) and electron cyclotron current drive (ECCD) is performed. The results show that OKCD has more advantages than ECCD for far off-axis localized current drive in tokamaks with large inverse aspect ratios, while ECCD is more efficient than OKCD in tokamaks with low inverse aspect ratios. The results of local current driving on the q = 2 rational surface show that both OKCD and ECCD are effective for control of the m = 2/n = 1 tearing mode or neoclassical tearing mode (NTM). It seems that efficient Ohkawa current can be driven in a specific far off-axis radial position as long as the local inverse aspect ratio is large enough. The effect of collisionality imposes a significant impact on OKCD and results in reduction of the net current driven by unit EC power. The dimensionless current drive efficiency of OKCD increases with increasing electron beta β<inf>e</inf>in a medium range. The results further confirm that OKCD can be a valuable alternative localized current drive method to replace ECCD in large inverse aspect ratio tokamaks or in the radial position where the local inverse aspect ratio is large enough.<br/> ©2018 Author(s).
语种：
英文
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Preparation of p-carboxyphenyl azo calix[4]arene phosphate derivative and its extraction properties toward uranium(VI)
作者：
Wang, Cheng;Xiao, Fang-zhu;Pu, Yi-qiu;Xu, Yu-li;Xu, Dong-yang;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2018年317(3):1235-1241 ISSN：0236-5731
通讯作者：
Peng, Guo-wen
作者机构：
[Xu, Dong-yang; Peng, Guo-wen; Xu, Yu-li; Wang, Cheng; Pu, Yi-qiu] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Xiao, Fang-zhu] Univ South China, Sch Publ Hlth, Hengyang 421001, Hunan, Peoples R China.;[Peng, Guo-wen; Zhang, Kang] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Peng, Guo-wen; Liu, Yong] Univ South China, Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Peng, Guo-wen] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Hunan, Peoples R China.
关键词：
Calix[4]arene;Functionalized modification;Extraction;Uranium(VI)
摘要：
P-carboxyphenyl azo calix[4]arene phosphate derivative (P-CACPD) was successfully synthesized using calix[4]arene as raw material. The P-CACPD was characterized by FT-IR and 1H-NMR. The effects of pH, extraction time and temperature on the extraction of U(VI) by P-CACPD were investigated. The results show that pH value, extraction time and temperature have an effect on the extraction of U(VI) by P-CACPD. When the initial pH is 5, temperature is 25 °C, extraction time is 2 h, the extraction rate of U(VI) by P-CACPD reaches the maximum. Both kinetics parameters and thermodynamic parameters of the extraction process were calculated. The calculated data indicate that the extraction process of uranium by P-CACPD is an exothermic spontaneous process, which well fits with the pseudo-second-order kinetic model. © 2018, Akadémiai Kiadó, Budapest, Hungary.
语种：
英文
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Transformation of uranium species in soil during redox oscillations
作者：
Fu, Haiying;Zhang, Hui;Sui, Yang;Hu, Nan;Ding, Dexin* ;...
期刊：
Chemosphere ,2018年208(Oct.):846-853 ISSN：0045-6535
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zhang, Hui; Ye, Yongjun; Li, Guangyue; Dai, Zhongran; Hu, Nan; Wang, Yongdong; Fu, Haiying] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Ding, Dexin; Ye, Yongjun; Sui, Yang; Fu, Haiying] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Sui, Yang] Hunan Taohuajiang Nucl Power Co Ltd, Yiyang 413000, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Redox cycling;Uranium speciation;Stable U(IV);Chemical extraction;Paddy soil
摘要：
Redox oscillation is commonly found in near-surface environment, where soils are often polluted with many redox active contaminants, including uranium (U). In order to investigate the transformation of U species in near-surface soil under redox oscillations conditions, redox oscillations and reduction experiments were performed, biogeochemical parameters and native microbial community composition were monitored, main elements on the surface of solid-phase were analyzed by XPS, and labile U(IV) species and stable U(IV) species in solid-phase were provisionally defined using an anoxic 1 M sodium bicarbonate extraction. It was found that redox oscillations slightly increased the water-soluble U but significantly increased the stable U(IV) species (P < 0.05) in soil. In reduction experiment, there was upper limit value for percentage of stable U(IV) species, and the labile U(IV) species could not transform to stable U(IV) species in a short period of time under reduction conditions. The redox transition of Fe enriched on the surface of soil and the conversion of microbial community composition played a major role in speciation transformation of U under redox oscillations conditions. In addition, sequential extraction revealed that the increase of stable U(IV) species content reflected the U speciation transition from acetate extract to more recalcitrant hydroxylamine extract. The finding provides a potential method for improving the stability of U when bio-reduction is used to remediate the U-contaminated soils. © 2018 Elsevier Ltd
语种：
英文
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Localized Confident Information Coverage Hole Detection in Internet of Things for Radioactive Pollution Monitoring
作者：
Yi, Lingzhi;Deng, Xianjun* ;Wang, Minghua;Ding, Dexin;Wang, Yan
期刊：
IEEE ACCESS ,2017年5:18665-18674 ISSN：2169-3536
通讯作者：
Deng, Xianjun
作者机构：
[Ding, Dexin; Yi, Lingzhi] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Wang, Minghua; Deng, Xianjun; Wang, Yan] Univ South China, Dept Commun Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Deng, Xianjun] U;Univ South China, Dept Commun Engn, Hengyang 421001, Peoples R China.
关键词：
Confident information coverage hole detection;cyber-physical-social networking;internet of things
摘要：
As a novel cyber-physical-social network paradigm, the Internet of Things (IoT) provides a powerful tool to monitor the hazardous fields of interest. Due to the uneven random deployment, sensor energy depletion, and external attacks, the emergence of coverage holes would remarkably degrade the network performance and quality of service. For overcoming the drawbacks resulting from the coverage holes, this paper focuses on how to locally detect coverage holes by exploiting one-hop neighboring sensors' cooperation based on the novel confident information coverage model (CIC), which is formulated as the localized confident information coverage hole detection (LCICHD) problem. For handling the CICHD problem, we devise a family of heuristic CIC holes detection schemes including the LCHD, LCHDRL, random and randomRL. Both the LCHD and LCHDRL schemes locally determine coverage status of each subregion and take the sensor communication ability into consideration. While the LCHDRL considers not only the sensor remaining energy but also the residual lifetime during the CIC hole detection. After acquiring the coverage status of each partitioned local subregion, the coverage hole boundary will be extracted by image processing techniques. For comparison, both the Random and RandomRL schemes arbitrarily select sensors within the sensing field to detect CIC holes, and the RandomRL scheme takes the sensors' residual lifetime into consideration during the hole detection process. Experimental simulations show that the proposed schemes can efficiently detect the emerged coverage holes including the locations and the number, and the LCHDRL algorithm is more practical and efficient compared with the other three peer solutions. © 2013 IEEE.
语种：
英文
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Modified water treatment residual as flocculant for Microcystis aeruginosa removal and water purification
作者：
Wang, H-Q.;Zhang, L-Y.* ;Fang, X-M;Zhang, A-N.
期刊：
International Journal of Environmental Science and Technology ,2017年14(11):2543-2550 ISSN：1735-1472
通讯作者：
Zhang, L-Y.
作者机构：
[Wang, H-Q.] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Zhang, L-Y.] Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China.;[Fang, X-M; Zhang, A-N.] Henan Univ Urban Construct, Sch Municipal & Environm Engn, Pingdingshan 467036, Peoples R China.
通讯机构：
[Zhang, L-Y.] C;Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China.
关键词：
Water treatment residual;Flocculant;Microcystis aeruginosa removal;Water purification;Orthogonal design
摘要：
Based on previous research, muriatic modification parameters (including the volume of hydrochloric acid, modification temperature and reaction time) were optimized by L<inf>9</inf>(3<sup>3</sup>) orthogonal design using the removal efficiency of unicellular M. aeruginosa as an index. The results showed that the optimized modification conditions consisted of a hydrochloric acid volume of 4 mL, a modification temperature of 200 °C and a reaction time of 3 h. Under the above conditions, the removal rate for unicellular and colonial M. aeruginosa was 89.26 and 75.53%, respectively. In addition, the flocculation process caused no cell damage, and the cells remained intact after use of the modified water treatment residuals (WTRs) flocculant. TP and TN in water were reduced by 63.37 and 19.03%, respectively. Therefore, the modified WTR flocculant was a technically viable method to remove unicellular and colonial M. aeruginosa. ©2017, Islamic Azad University (IAU).
语种：
英文
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Numerical simulation to quantify the leakage risk in a multi-layer aquifer system of pure brine recovery and CO2 -enhanced brine recovery: a case study of potassium-rich brine recovery in Jianghan Basin of China
作者：
Fang, Qi;Lv, Junwen;Peng, Guojian* ;Luo, Caiwu;Li, Mi;...
期刊：
Environmental Earth Sciences ,2017年76(13):1-11 ISSN：1866-6280
通讯作者：
Peng, Guojian
作者机构：
[Li, Mi; Fang, Qi; Lv, Junwen; Tan, Wenfa; Luo, Caiwu; Luo, Yingfeng] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Peng, Guojian] Univ South China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Peng, Guojian] U;Univ South China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
Pure brine recovery (PBR);CO2-enhanced brine recovery (CO2-EBR);A multi-layer aquifer;Leakage risk;Pressure control
摘要：
Deep brine recovery enhanced by supercritical CO2 injection is proposed to be a win–win method for the enhancement of brine production and CO2 storage capacity and security. However, the cross-flow through interlayers under different permeability conditions is not well investigated for a multi-layer aquifer system. In this work, a multi-layer aquifer system with different permeability conditions was built up to quantify the brine production yield and the leakage risk under both schemes of pure brine recovery and enhanced by supercritical CO2. Numerical simulation results show that the permeability conditions of the interlayers have a significant effect on the brine production and the leakage risk as well as the regional pressure. Brine recovery enhanced by supercritical CO2 injection can improve the brine production yield by a factor of 2–3.5 compared to the pure brine recovery. For the pure brine recovery, strong cross-flow through interlayers occurs due to the drastic and extensive pressure drop, even for the relative low permeability (k=10−20m2) mudstone interlayers. Brine recovery enhanced by supercritical CO2 can successfully manage the regional pressure and decrease the leakage risk, even for the relative high permeability (k=10−17m2) mudstone interlayers. In addition, since the leakage of brine mainly occurs in the early stage of brine production, it is possible to minimize the leakage risk by gradually decreasing the brine production pressure at the early stage. Since the leakage of CO2 occurs in the whole production period and is significantly influenced by the buoyancy force, it may be more effective by adopting horizontal wells and optimizing well placement to reduce the CO2 leakage risk. © 2017, Springer-Verlag GmbH Germany.
语种：
英文
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REMOVAL OF MICROCYSTIS AERUGINOSA BY CHITOSAN AND ILLITE
作者：
Wang, H. Q.;Zhang, L. Y.*
期刊：
VIE ET MILIEU-LIFE AND ENVIRONMENT ,2017年67(3-4):173-177 ISSN：0240-8759
通讯作者：
Zhang, L. Y.
作者机构：
[Wang, H. Q.] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Zhang, L. Y.] Chinese Res Inst Environm Sci, Lab Water Environm Syst Engn, Beijing 100012, Peoples R China.
通讯机构：
[Zhang, L. Y.] C;Chinese Res Inst Environm Sci, Lab Water Environm Syst Engn, Beijing 100012, Peoples R China.
关键词：
Chitosan;Cyanobacteria;Illite;Microcystis aeruginosa
摘要：
In recent years, massive water blooms of cyanobacteria occurred in many freshwater lakes and reservoirs, and cause severe water quality problems including scum formation, toxin production, taste and odors, and hypoxia generation. Therefore, a new environmental friendly method was proposed for cyanobacterial bloom mitigation using chitosan and illite. The effects of particle size of illite, addition of illite, addition of chitosan on Microcystis aeruginosa removal was examined through batch experiments. The results showed that the removal efficiency of cyanobacteria had a strong dependence on the changes of particle size of illite, addition of illite, addition of chitosan. The highest removal efficiency, 97.42 %, was obtained under the optimal conditions. This study demonstrated that there were technically viable methods using chitosan and illite to remove M. Aeruginosa cells. © 2017 Universite de Paris VI (Pierre et Marie Curie). All rights reserved.
语种：
英文
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Cyanobacteria bloom mitigation using calcium hydroxide and an Illite composite Algicide
作者：
Wang, Hongqiang;Zhang, Anna;Zhang, Lieyu*
期刊：
Fresenius Environmental Bulletin ,2017年25(12):7801-7805 ISSN：1018-4619
通讯作者：
Zhang, Lieyu
作者机构：
[Wang, Hongqiang] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Zhang, Lieyu] Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China.;[Zhang, Anna] Tianjin Chengjian Univ, Sch Environm & Municipal Engn, Tianjin 300384, Peoples R China.
通讯机构：
[Zhang, Lieyu] C;Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China.
关键词：
Calcium hydroxide;Colonial m. aeruginosa;Cyanobacteria blooms;Illite;Unicellular m. aeruginosa
摘要：
A method was developed for cyanobacteria bloom (unicellular and colonial Microcystis aeruginosa) mitigation using calcium hydroxide and an illite composite algicide. The maximum cell removal efficiency was 84.72% when calcium hydroxide was used alone. When illite and calcium hydroxide were used together, the removal efficiency increased to 90.43% within 9 h. In addition, the results also showed that the composite algicide could remove total nitrogen (TN) and total phosphorus (TP) in eutrophic water. However, the removal efficiency of TP is more evident than that of TN under the same composite algicide doses. Thus, the method would provide an alternative composite algicide to mitigate cyanobacteria blooms using calcium hydroxide and illite in eutrophic water. © by PSP.
语种：
英文
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Composition of the ethyl acetate extracts from Portulaca oleracea and determination of their antialgal activity
作者：
Liang, Feng;Wang, Hongqiang*
期刊：
Fresenius Environmental Bulletin ,2017年26(12):7101-7104 ISSN：1018-4619
通讯作者：
Wang, Hongqiang
作者机构：
[Liang, Feng] Henan Univ Urban Construct, Sch Municipal & Environm Engn, Pingdingshan 467036, Henan, Peoples R China.;[Wang, Hongqiang] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Wang, Hongqiang] U;Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.
关键词：
Algae;Allelopathic activity;Fatty acid;Portulaca oleracea
摘要：
In order to identify these allelochemicals of ethyl acetate extracts from Portulacaceae and seeds, the chemical components of the extracts were analyzed by gas chromatography-mass spectrometry (GC-MS). The algal inhibitory effects of the extracts were determined by bioassays using Microcystis aeruginosa. 15 kinds of compounds, including fatty acid, ester, ketone, sterol were obtained and 8 identified fatty acids and N-phenyl-2-Naphthalenamine were found to be significantly active against some harmful algae. The inhibitory ratios of the ethyl acetate extracts for M. aeruginosa were 56.1% and 49.4% when the algae were exposed to 20.0 mg/L of the extracts, respectively. The results suggested that these ethyl acetate extracts from Portulacaceae and seeds may serve as environmentally friendly agents for controlling the growth of M. aeruginosa. © by PSP.
语种：
英文
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Optimization of demulsification-coagulation-adsorption parameters for the treatment of wastewater with fluorescent permeating agent from a Chinese machinery plant
作者：
Zhang, Xiaowen* ;Wang, Beibei* ;Wu, Xiao Yan;Li, Mi;Tan, Wenfa
期刊：
Desalination and Water Treatment ,2017年100:46-54 ISSN：1944-3994
通讯作者：
Zhang, Xiaowen;Wang, Beibei
作者机构：
[Li, Mi; Zhang, Xiaowen; Tan, Wenfa; Wu, Xiao Yan; Wang, Beibei] Univ South China, Sch Environm & Safety Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhang, XW; Wang, BB] U;Univ South China, Sch Environm & Safety Engn, Hengyang, Hunan, Peoples R China.
关键词：
Demulsification-coagulation-adsorbtion;Emulsifying wastewater;Fluorescent penetrant
摘要：
Fluorescent penetrant is used for the cleaning process of precision machine parts in non-destruc-tive testing (NDT). Wastewater will be produced in that course with high chemical oxygen demand (COD) (1000–15,000 mg/L), high mineral oil (300–3000 mg/L) and high chroma (600–2000). This liquid waste has a serious influence on the environment due to its’ stronger biological toxicity and higher virulence. When the oil content exceeds 0.01 mg/L in water, the water will lack oxygen and lead aquatic plants and animals to die, thus create badly water pollution. How to treat this polluted water is a difficult task in sewage treatment. The demulsification-coagulation-adsorption process was adapted for conducting this emulsifying wastewater. This research has compared the demulsification effects between the nonionic surfactant demulsifier of AR and the electrolyte demulsifier of CaCl2 and MgCl2 as well as the coagulation performance between the polymeric aluminum chloride (PAC) and the polyaluminium chloride sulfate (PACS). Effects of the types of demulsifier and coagulant, dosage, pH, static duration, absorbing time and other process parameters have been investigated. Based on this, the process parameters have been optimized. The results shown that the best treatment condition was using AR as demulsifier, PACS as flocculant, and vermiculite as adsorbent, which resulted in higher quality and efficiency in removal of 97.87% COD, 99.62% oil and 99.22% colority. This could meet the first grade standard of the national integrated wastewater discharge standard (GB8978-1996). Thus, the integration method of demulsification-coagulation-adsorbtion is a practicable way to solve this kind of sewage. © 2017 Desalination Publications. All rights reserved.
语种：
英文
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A universal laboratory method for determining physical parameters of radon migration in dry granulated porous media
作者：
Ye, Yong-jun* ;Zhang, Yun-feng;Dai, Xin-tao;Ding, De-xin
期刊：
Journal of Environmental Radioactivity ,2017年177:135-141 ISSN：0265-931X
通讯作者：
Ye, Yong-jun
作者机构：
[Ye, Yong-jun; Ding, De-xin] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;[Dai, Xin-tao; Ye, Yong-jun; Zhang, Yun-feng] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ye, Yong-jun] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
关键词：
Free radon production rate;Granulated porous media;Permeability;Porosity;Radon diffusion coefficient
摘要：
The particle size and heaped methods of exhalation media have important effects on physical parameters, such as the free radon production rate, porosity, permeability, and radon diffusion coefficient. However, existing methods for determining those parameters are too complex, and time-consuming. In this study, a novel, systematic determining method was proposed based on nuclide decay, radon diffusion migration theory, and the mass conservation law, and an associated experimental device was designed and manufactured. The parameters of uranium ore heap and sandy soil of radon diffusion coefficient (D), free radon production rate (alpha), media permeability (k), and porosity (epsilon) were obtained. At the same time, the practicality of the novel determining method was improved over other methods, with the results showing that accuracy was within the acceptable range of experimental error. This novel method will be of significance for the study of radon migration and exhalation in granulated porous media. (C) 2017 Elsevier Ltd. All rights reserved.
语种：
英文
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A Nonlinear Approach for Time-Dependent Settlement Analysis of a Single Pile and Pile Groups
作者：
Feng, Shengyang* ;Li, Xiangyang;Jiang, Fuliang;Lei, Lin;Chen, Zhi
期刊：
Soil Mechanics and Foundation Engineering ,2017年54(1):7-16 ISSN：0038-0741
通讯作者：
Feng, Shengyang
作者机构：
[Chen, Zhi; Feng, Shengyang; Lei, Lin; Jiang, Fuliang; Li, Xiangyang] Univ South China, Sch Environm Protect & Safety Engn, Hengyang, Peoples R China.
通讯机构：
[Feng, Shengyang] U;Univ South China, Sch Environm Protect & Safety Engn, Hengyang, Peoples R China.
摘要：
The settlement of piles in soft soil can last for several decades because of the creep or viscoelastic behavior of soft soil around the pile. This paper proposes nonlinear viscoelastic pile shaft and pile base load transfer (t −z) models based on the modified Burgers model in which the spring is substituted by a hyperbolic model. Using these models, we developed a nonlinear approach to calculate the time-dependent settlement of a vertically loaded single pile and pile groups in layered soft soil. Parametric studies were conducted to investigate the influence of the calculation parameters on the time-dependent settlement of a single pile. The time-dependent settlement of a well-instrumented pile loading test was calculated. Theoretical results were in close agreement with measured results and demonstrate the effectiveness and accuracy of the proposed approach. ©2017, Springer Science+Business Media New York.
语种：
英文
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PREPARATION OF SODIUM ALGINATE/ GRAPHENE OXIDE /GALLIC ACID COMPLEX GEL BEADS AND THEIR ALGAE REMOVAL PERFORMANCE
作者：
Xiong, Ying;Wang, Hongqiang;Zhang, Lieyu* ;Wang, Lei;Che, Wu
期刊：
Fresenius Environmental Bulletin ,2017年26(4):2925-2929 ISSN：1018-4619
通讯作者：
Zhang, Lieyu
作者机构：
[Xiong, Ying; Che, Wu] Beijing Univ Civil Engn & Architecture, Key Lab Urban Stormwater Syst & Water Environm, Minist Educ, Beijing 100044, Peoples R China.;[Wang, Hongqiang] Univ South China, Coll Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Wang, Lei; Zhang, Lieyu] Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China.
通讯机构：
[Zhang, Lieyu] C;Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China.
关键词：
sodium alginate;graphene oxide;gallic acid;gel bead;Microcystis aeruginosa
摘要：
Sodium alginate / graphene oxide/ gallic acid (SA/GO/GA) complex gel beads were prepared and were characterized. Removal efficiency of algae onto SA/GO/GA complex gel beads were investigated with different GO and GA content. The results showed that the removal efficiency of algae from aqueous solutions using SA gel beads were very low, but introduction of GO and GA of complex gel beads could sharply increase the removal efficiency of algae onto by 3 times. The amounts of SA/ GO/GA complex gel beads have significant effect on removal of algae. In addition, for the density algae in the range of 2.17-17.36 cells/mL, there was a linear relation between the removal efficiency of algae and the density algae. This stoichiometric linear relation has directed significance to engineering application in eutrophic waters.
语种：
英文
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Predictive analysis of shaft station radon concentrations in underground uranium mine: A case study
作者：
Zhao, Guoyan;Hong, Changshou* ;Li, Xiangyang;Lin, Chunping;Hu, Penghua
期刊：
Journal of Environmental Radioactivity ,2016年158-159:129-137 ISSN：0265-931X
通讯作者：
Hong, Changshou
作者机构：
[Lin, Chunping; Zhao, Guoyan; Hong, Changshou] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.;[Li, Xiangyang] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Hu, Penghua] China Natl Nucl Corp, Beijing Res Inst Chem Engn & Met, Beijing 101149, Peoples R China.
通讯机构：
[Hong, Changshou] C;Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.
关键词：
Predictive model;Queuing theory;Radon contamination;Shaft station;Underground uranium mine
摘要：
This paper presented a method for predicting shaft station radon concentrations in a uranium mine of China through theoretical analysis, mathematical derivation and Monte-Carlo simulation. Based upon the queuing model for tramcars, the average waiting time of tramcars and average number of waiting tramcars were determined, which were further used in developing the predictive model for calculating shaft station radon concentrations. The results exhibit that the extent of variation of shaft station radon concentration in the case study mine is not significantly affected by the queuing process of tramcars, and is always within the allowable limit of 200 Bq m(-3). Thus, the empirical limit of 100,000 T annual ore hoisting yields has no value in ensuring radiation safety for this mine. Moreover, the developed model has been validated and proved useful in assessing shaft station radon levels for any uranium mine with similar situations. (C) 2016 Elsevier Ltd. All rights reserved.
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英文
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