A model of reaeration rates driven by shear flows
作者:
Duan, Zhiyong*
期刊:
Water and Environment Journal ,2019年33(4):582-588 ISSN:1747-6585
通讯作者:
Duan, Zhiyong
作者机构:
[Duan, Zhiyong] Univ South China, Sch Civil Engn, Hengyang 421000, Hunan, Peoples R China.
通讯机构:
[Duan, Zhiyong] U;Univ South China, Sch Civil Engn, Hengyang 421000, Hunan, Peoples R China.
关键词:
two-phase interface;reaeration rate;shear flows
摘要:
The reaeration rate determines the speed that the dissolved oxygen is restored to the saturation level. The reaeration rate is determined by the surface renewal rates from the friction interfaces in the water bodies, including the water/bed interface, the shear-flow interface and the air/water interface. The formulae of reaeration rate for the air/water interface and the water/bed interface were developed in prior studies. However, no formula of the reaeration rate driven by the shear flows was developed. In this study, a mechanic model of the reaeration rate driven by the shear flows is developed to fill in the gap. The flow velocity profile in the shear flows and the Surface Renewal Theory are employed to derive the corresponding model. The predictions of the formulae for these three types of friction interfaces are compared for the same phase velocity to investigate the reasonability of the reaeration rate model for the shear-flow interface. The predictions of the model for the shear-flow interface are between those for the air/water interface and for the water/bed interface. The model in this study is also verified to have reasonable agreements with the experimental data. The model developed in this study can be applied for the prediction of the low soluble gases’ transfer rate between air and water in shear flows. © 2018 CIWEM
语种:
英文
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气液接触蒸发高盐废水试验研究与能耗分析
作者:
王艳辉;黄仕元;李青青;黄筱
期刊:
现代盐化工 ,2019年46(1):37-38,41 ISSN:2095-9710
作者机构:
南华大学 土木工程学院 市政工程系,湖南 衡阳,421001;[王艳辉; 李青青; 黄仕元; 黄筱] 南华大学
关键词:
高盐废水;污水浓缩;气液接触;能耗分析
摘要:
开发设计气液接触蒸发高盐废水实验装置进行现场试验,研究不同的影响因素对系统水量蒸发的影响,并对该技术进行能耗分析。实验结果表明:初始水温和循环流量能促进系统水量蒸发,水温越高蒸发效率增速越大,循环流量过大时蒸发速率反而逐渐下降;系统电能耗量随温度的升高而降低,当初始水温为45℃时,系统能节约2/3的电能耗量。
语种:
中文
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粉煤灰地聚物反应机理及各组分作用的研究进展
作者:
付彬
期刊:
百科论坛电子杂志 ,2019年(20):194 ISSN:2096-3661
作者机构:
南华大学土木工程学院 湖南 衡阳 421000;[付彬] 南华大学
关键词:
粉煤灰;地聚物;反应机理
摘要:
地聚物亦称地聚合物或地质聚合物,是一种由硅铝四面体单元组成三维立体网状结构的无机聚合物.粉煤灰地聚物是以粉煤灰为主原料,与其他固体废弃物或天然硅铝材料在一定条件下生成的地聚物.地聚物具备陶瓷、水泥等材料的优点,是当前粉煤灰应用中的绿色新型材料.本文介绍了地聚物反应机理模型和地聚合体系各组分的作用.
语种:
中文
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浅析实验与可视化教学在高校土木工程力学教学中的应用
作者:
方耀楚
期刊:
当代教育实践与教学研究 ,2019年(22):183-184 ISSN:2095-6711
作者机构:
南华大学土木工程学院
关键词:
土木工程;实验教学;可视化教学;实践能力;创新能力
摘要:
伴随着国内教育改革进程的不断推进,国家和教育部进一步地对培养学生的综合素养和创新能力进行了强调。高校在进行人才的培养和教学时,不能用过去重理论轻应用的态度进行教学。尤其对于土木工程专业来说,其学科内容包括甚广并且很细致,对于土木工程力学这样的基础课程,就更加需要专业教师对教学方式进行革新,从在结合实践的基础上进行有效教学。通过实验教学和可视化教学的应用,培养学生实践能力和科学探索精神,帮助他们提高创新能力。本文从土木工程力学的教学现状入手展开分析,分别阐述实验教学和可视化教学的应用。
语种:
中文
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基于线性插值法的年径流总量控制率与设计降雨量快速估算
作者:
刘慧;孙波;曾凡勇;谢水波
期刊:
水利规划与设计 ,2019年(10):41-43+148 ISSN:1672-2469
作者机构:
南华大学建筑学院,湖南衡阳421001;南华大学土木工程学院,湖南衡阳421001;[曾凡勇; 谢水波; 孙波; 刘慧] 南华大学
关键词:
线性插值法;设计降雨量;年径流总量控制率
摘要:
各城市5%步长年径流总量控制率与设计降雨量无法完全满足海绵城市专项规划编制及相关科研工作的需求。因此,本研究以萍乡市莲花县为例借助线性插值法对1%步长年径流总量控制率与设计降雨量进行估算,并将10958条降雨数据统计得出的实际值与估算值做误差分析,结果表明,该方法具有准确率高、快速、简便且无需重新统计萍乡市近30年日值降雨数据等优点,具有较好的可推广性。
语种:
中文
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Analysis of the Spatial Distribution Characteristics of Urban Resilience and Its Influencing Factors: A Case Study of 56 Cities in China
作者:
Zhang, Maomao;Chen, Weigang;Cai, Kui;Gao, Xin;Zhang, Xuesong* ;...
期刊:
International Journal of Environmental Research and Public Health ,2019年16(22) ISSN:1661-7827
通讯作者:
Zhang, Xuesong;Liu, Jinxiang
作者机构:
[Zhang, Xuesong; Zhang, Maomao; Li, Deshou] Hubei Prov Key Lab Geog Proc Anal & Simulat, Wuhan 430079, Hubei, Peoples R China.;[Zhang, Xuesong; Zhang, Maomao; Li, Deshou] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Hubei, Peoples R China.;[Wang, Zhiyuan; Chen, Weigang] Univ South China, Sch Architecture, Hengyang 421001, Peoples R China.;[Cai, Kui] Hebei GEO Univ, Inst Geol Survey, Shijiazhuang 050031, Hebei, Peoples R China.;[Gao, Xin] Hohai Univ, Business Sch, Nanjing 211100, Jiangsu, Peoples R China.
通讯机构:
[Zhang, Xuesong] H;[Zhang, Xuesong] C;[Liu, Jinxiang] U;Hubei Prov Key Lab Geog Proc Anal & Simulat, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Hubei, Peoples R China.
关键词:
56 cities;influencing factor;spatial distribution;spatial regression model;urban resilience
摘要:
The healthy development of the city has received widespread attention in the world, and urban resilience is an important issue in the study of urban development. In order to better provide a useful reference for urban resilience and urban health development, this paper takes 56 cities in China as the research object, and selects 29 indicators from urban infrastructure, economy, ecology and society. The combination weight method, exploratory spatial data analysis (ESDA) and spatial measurement model are used to explore the spatial distribution of urban resilience and its influencing factors. From 2006 to 2017, the urban resilience of prefecture-level cities in the four provinces showed a wave-like rise. During the study period, the urban resilience values, measured as Moran’s Is, were greater than 0.3300, showing a significantly positive correlation in regard to their spatial distribution. Regarding the local spatial correlation, the urban resilience of the study area had spatial agglomeration characteristics within the province, with a significant distribution of “cold hot spots” in the spatial distribution. From the perspective of the factors that affected urban resilience, the proportion of the actual use of foreign capital in GDP and carbon emissions per 10,000 CNY of GDP had a negative impact and GDP per square kilometer, the proportion of urban pension insurance coverage, the proportion of the population with higher education, and expenditure to maintain and build cities had a positive impact. The development strategy of urban resilience must be combined with the actual situation of the region, and the rational resilience performance evaluation system and the top-level design of urban resilience improvement should be formulated to comprehensively improve urban resilience. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
语种:
英文
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顶板辐射供冷下不同姿态人体的热舒适性
作者:
刘剑桥;刘泽华;朱辉;陈拼
期刊:
科学技术与工程 ,2019年19(5):278-283 ISSN:1671-1815
作者机构:
南华大学土木工程学院,衡阳 421001;南华大学建筑环境控制技术湖南省工程实验室,衡阳 421001;南华大学土木工程学院,衡阳,421001;[刘剑桥; 朱辉; 陈拼; 刘泽华] 南华大学
关键词:
热舒适;热感觉;皮肤温度;卧姿人体
摘要:
为了探究辐射供冷环境下人体姿态对热舒适的影响,采用主观调查问卷与生理指标测试的方法对夏季顶板辐射供冷下坐姿人体和卧姿人体的热舒适性进行了实验研究。结果表明:人体卧姿状态与坐姿状态皮肤温度的分布有一定差异,两种姿态下热感觉在-0. 5~0. 5范围内时,卧姿人体所需要的操作温度比坐姿人体高0. 5℃左右;最佳热舒适点的操作温度,卧姿状态比坐姿状态高0. 7℃。
语种:
中文
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灭活与非灭活条件下植物乳杆菌去除U(VI)的机理
作者:
刘金香;蒲亚帅;谢水波;刘迎九;陈子庚;...
期刊:
中国环境科学 ,2019年39(7):2880-2888 ISSN:1000-6923
作者机构:
南华大学土木工程学院,湖南衡阳 421001;南华大学污染控制与资源化技术湖南省高校重点实验室,湖南衡阳 421001;南华大学土木工程学院,湖南衡阳,421001;南华大学污染控制与资源化技术湖南省高校重点实验室,湖南衡阳,421001;[陈子庚; 蒲亚帅; 刘金香; 李仕友; 谢水波; 刘迎九] 南华大学
关键词:
植物乳杆菌;生物吸附;矿化机理;生物还原
摘要:
在不同时间,pH值和生物量浓度条件下,进行了灭活与非灭活植物乳杆菌去除水中铀的对比试验,探讨了二者去除水中铀的机理,通过SEM-EDS、 FTIR、XPS及XRD分析了铀与菌体表面的微观作用机理以及菌体表面沉积物的特征.结果表明:植物乳杆菌经灭活后,其吸附铀的能力得到显著的提高,当U(VI)初始浓度为10mg/L、pH值为6.0、37℃条件下,120min内灭活菌体对U(VI)的去除率为94.7%,而活菌体的去除率为88.9%.灭活菌体具有更高的铀吸附容量,在生物量浓度为0.06~0.24mg/L,pH值(3.0~7.0)条件下,灭活菌体与活菌体的U(VI)累积容量比W均大于1. SEM-EDS、FTIR分析结果表明,活细胞和灭活细胞都可通过细胞表面的羟基、酰基及羧基等官能团吸附、配位络合U(VI). XRD分析表明,活菌体可生物磷酸矿化水中的U(VI).活菌体的XRD谱图在2θ(18.023,25.492,27.343,40.813°处)有4个明显的磷酸铀酰晶体峰,而灭活菌体的XRD谱图显示为非晶态.XPS结果表明,活菌体可生物还原U(VI).活菌体能谱图中U4f7/2和U4f5/2轨道出现了结合能为380.20eV和390.65eV的U(VI)分裂峰,而灭活菌体的能谱图中没有出现U(IV)的分裂峰.
语种:
中文
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Dynamic responses of high-speed railway transition zone with various subgrade fillings
作者:
Hu, Ping;Zhang, Chunshun* ;Wen, Sen;Wang, Yonghe
期刊:
Computers and Geotechnics ,2019年108:17-26 ISSN:0266-352X
通讯作者:
Zhang, Chunshun
作者机构:
[Hu, Ping] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Zhang, Chunshun; Hu, Ping] Monash Univ, Dept Civil Engn, Melbourne, Vic 3800, Australia.;[Wen, Sen] Henan Univ, Sch Civil Engn & Architecture, Kaifeng 475004, Peoples R China.;[Wang, Yonghe] Cent S Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China.
通讯机构:
[Zhang, Chunshun] M;Monash Univ, Dept Civil Engn, Melbourne, Vic 3800, Australia.
关键词:
Dynamic analysis;High-speed railway;Subgrade fillings;Transition zone
摘要:
In order to explore more economic filling alternatives than typically used graded gravel + 5% cement in a high-speed railway transition zone, engineering properties of graded gravel (without cement) and A, B group filling (well graded coarse-grained soil with less than 30% of fine-grained soil) were tested. This is followed by the establishment of a 3D vertical coupling dynamic model of a tunnel-culvert-tunnel transition section based on the D'Alembert's principle of energy weak variation and the Lagrange scheme. The model results have been validated against the in situ measurements. The analysis from the model show that both graded gravel and A, B group filling are well-graded with high strengths, and the dynamic responses of the roadbed supported by the two fillings are both less than allowable values at the speed of 350 km/h. However, the curves of vertical displacement along the longitudinal transition section are great like a shape of “W” with the A, B group filling in the transition zone. Therefore, the graded gravel is recommended to be more suitable than the A, B group filling for the studied tunnel-culvert-tunnel transition zone. This recommendation may be applicable to the case with a rock subgrade underneath to support the transition zone. Comparatively, for a soil subgrade under the transition zone, our results indicate that graded gravel + 5% cement is still the best filling material, while the other two less stiffer filling materials would result in considerable fluctuations to the roadbed surface. © 2018 Elsevier Ltd
语种:
英文
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A wind-driven gas exchange rate model
作者:
Duan, Zhiyong*
期刊:
ENVIRONMENTAL ENGINEERING SCIENCE ,2019年36(3):344-349 ISSN:1092-8758
通讯作者:
Duan, Zhiyong
作者机构:
[Duan, Zhiyong] Univ South China, Sch Civil Engn, Hengyang 421000, Hunan, Peoples R China.
通讯机构:
[Duan, Zhiyong] U;Univ South China, Sch Civil Engn, Hengyang 421000, Hunan, Peoples R China.
关键词:
gas exchange rate;water quality modeling;wind-driven
摘要:
The dissolved oxygen is a major factor influencing the water quality of a water body. The gas exchange rate determines the speed that the low soluble gases, including dissolved oxygen, transfer from atmosphere to water. The wind-driven gas exchange rate model is important for the water quality modeling in water bodies such as lakes and estuaries when the wind is the predominant factor. Although empirical formulae have been developed for wind-driven gas exchange rate, they cannot explain the mechanisms of wind-driven gas exchange rate. The empirical formulae are normally limited in their applicability due to the specific experimental conditions under which they were established. This study is to develop a mechanistic wind-driven gas exchange rate model for the general application ranges. This mechanistic wind-driven gas exchange rate model correlates the gas exchange rate with the hydrodynamic parameters based on the surface renewal mechanism and the two-film transfer mechanism. The gas exchange rate values predicted with this model show reasonable agreements with the experimental data in the wind-driven gas exchange systems. This model can be applied for water bodies with wind blowing over the water surface as the predominant factor influencing the exchange rate of the low soluble gases. © 2019 Mary Ann Liebert, Inc., publishers.
语种:
英文
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耐热材料防护服厚度优化研究
作者:
黄新运;索昊;刘彩美;杨睿
期刊:
价值工程 ,2019年38(1):174-176 ISSN:1006-4311
作者机构:
南华大学土木工程学院,衡阳,421001;南华大学电气工程学院,衡阳,421001;南华大学核科学技术学院,衡阳,421001;[索昊; 杨睿; 刘彩美; 黄新运] 南华大学
关键词:
耐热材料;防护服;厚度;优化设计
摘要:
针对耐热材料的厚度优化问题,通过调研耐热防护服的应用及热防护原理,设计出一套最优化不等式方程组作为约束条件,求解出不同厚度材料的合理优化区间,考虑到材料成本及防护服本身防护性能,特别的引入热阻,得到耐热材料的最优厚度解,为今后研究耐热防护材料厚度优化问题的研究提供了一种分析思路。
语种:
中文
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Fuzzy Optimization Design of Disc Brakes Based on Genetic Algorithm
作者:
Jianbin Wang;Jishu Yin
作者机构:
School of Mechanical Engineering,University of South China,Hengyang,Hunan Province,China;School of Civil Engineering,University of South China,Hengyang,Hunan Province,China
会议名称:
2019机械设计国际会议暨第20届机械设计学术年会
会议时间:
2019-08-12
会议地点:
浙江湖州
会议论文集名称:
2019机械设计国际会议暨第20届机械设计学术年会论文集
关键词:
Disc brakes;Optimization design;Fuzzy analysis
摘要:
The braking torque and the temperature rise of the brake are the two key indexes in the design of a disc brake for motor vehicles and have great effects on the safety of brakes.In the present study,by using the maximum braking torque and the minimum temperature rise as the objective functions and by considering the fuzziness of all the constrained boundaries,we established the mathematical model for fuzzy optimization design of disc brakes.The parameters,including the inside and outside radius of the friction plate,the diameter(D)and thickness(a)of the brake disc,the piston diameter,and the oil pressure(p)in the cylinder,were determined by Genetic Algorithm(GA)in the Matlab optimum tool box.This study provides an optimized solution for the design of disc brakes.
语种:
英文
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植物乳杆菌吸附水中U(VI)的特性与机理研究
作者:
刘金香;蒲亚帅;谢水波;刘迎九;陈子庚;...
期刊:
水处理技术 ,2019年45(2):61-66 ISSN:1000-3770
作者机构:
南华大学土木工程学院 湖南衡阳421001;南华大学污染控制与资源化技术湖南省高校重点实验室 湖南衡阳421001;[陈子庚; 蒲亚帅; 刘金香; 李仕友; 谢水波; 刘迎九] 南华大学
关键词:
植物乳杆菌;吸附;机理
摘要:
以热灭活的植物乳杆菌为生物吸附剂,探讨了吸附U(VI)的影响,并采用扫描电镜-能谱、红外光谱等手段研究了U(VI)的吸附机理。结果表明,植物乳杆菌对U(VI)具有良好的吸附效果。在pH为6.0,温度30℃,灭活乳杆菌投加量为120 mg/L,初始U(VI)的质量浓度为10 mg/L时,植物乳杆菌对U(VI)的去除率可达94.28%,吸附平衡时间为4 h。吸附过程较好符合准2级动力学吸附模型和Freundlich模型。经过灭活的植物乳杆菌的菌体比表面积增加,能更好的吸附U(VI),配位络合是菌体吸附U(VI)的主要机理,参与吸附的官能团有细胞表面多糖与蛋白质羟基、蛋白质酰胺基、羧基与磷酸酯基等。此外菌体表面的静电作用也是吸附的方式之一。
语种:
中文
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无纺布纤维汽车过滤器过滤效率及阻力特性研究
作者:
陈拼;刘泽华;刘剑桥;黄玲玲;王凤予;...
期刊:
流体机械 ,2019年47(9):27-32 ISSN:1005-0329
作者机构:
南华大学土木工程学院,湖南衡阳,421000;[刘剑桥; 黄玲玲; 王凤予; 谭子豪; 陈拼; 刘泽华] 南华大学
关键词:
多孔介质;过滤效率;压损;填充率;过滤面积
摘要:
以无纺布纤维为材料,利用多孔介质结构脱除颗粒物。试验研究表观风速对过滤效率的影响,不同填充率下过滤面积和风速对压损的影响,不同填充率下风速对速度损失率的影响,分析多孔介质过滤机理。结果表明:汽车过滤器过滤效率随表观过滤风量增加而减小至一定值,效率曲线可由y=exp(a+bx+cx~2)表示;随过滤面积增加,材料阻力会降低,结构阻力会增加,压损呈现先降低再增加;风速增加,压损增加;填充率增加,压损增加;风速从0.54 m/s增至2 m/s时,经过过滤器后速度减少量在8%~12%,实测值与模拟值吻合度高。
语种:
中文
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单层玻璃幕墙建筑空调运行策略的实验研究全文替换
作者:
丁伟;谢东;王汉青;李铖骏
期刊:
建筑热能通风空调 ,2019年38(1):23-27+54 ISSN:1003-0344
作者机构:
南华大学土木工程学院;建筑环境控制技术湖南省工程实验室;[王汉青; 李铖骏; 谢东; 丁伟] 南华大学
关键词:
夏热冬冷地区;单层玻璃幕墙;分体空调;室内热环境;运行策略
摘要:
以夏热冬冷地区某一单层玻璃幕墙+分体空调制冷送风办公用房为对象, 采用实验测试的方式, 设置3种不同实验工况, 分析11种空调运行模式下室内热环境特性, 讨论空调季高温月份单层玻璃幕墙建筑分体空调运行策略, 以对单层玻璃幕墙建筑空调节能运行提供一定指导.
语种:
中文
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建筑热桥研究进展与展望
作者:
王汉青;邝福军
期刊:
建筑热能通风空调 ,2019年38(8):59-63+71 ISSN:1003-0344
作者机构:
[王汉青; 邝福军] 建筑环境控制技术湖南省工程实验室;装配式建筑节能技术湖南省重点实验室;南华大学土木工程学院
关键词:
建筑热桥;建筑节能;研究方法;热桥防范
摘要:
本文首先介绍了热桥的定义、热桥在建筑中的主要表现形式以及热桥对建筑能耗和墙体结露的影响。接着,就建筑热桥的数学建模、数值分析、实验方法等不同研究手段进行了回顾总结,同时对国内外关于建筑热桥的防范解决措施及研究难点的现状进行了阐述。最后,针对多因素作用下的热桥分析、新形式热桥研究、计算模型简化、热桥防护等领域的新方向及突破点进行了展望。
语种:
中文
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基于响应曲面法小型旋风分离器的多目标优化
作者:
梁文龙;戴石良;田伶
期刊:
建筑热能通风空调 ,2019年38(3):91-95 ISSN:1003-0344
作者机构:
南华大学土木工程学院;湖南核三力技术工程有限公司;[田伶; 梁文龙; 戴石良] 南华大学
关键词:
旋风分离器;响应曲面法;优化设计;预测模型
摘要:
本文采用RSM湍流模型对不同尺寸参数的旋风分离器气固两相流场进行数值模拟,基于响应曲面法建立旋风分离器的欧拉数和分割粒径的预测模型。结果表明:排气管直径对欧拉数及分割粒径的影响极其显著,随着排气管直径的增大,欧拉数先迅速减小后缓慢增大,分割粒径增大。入口高度和入口宽度对欧拉数及分割粒径的影响极其显著,随着入口高度和入口宽度的增大,欧拉数增大,分割粒径增大。总高对分割粒径的影响显著,随着总高的增大,分割粒径减小。优化模型相比于Stairmand基准模型,欧拉数降低58%,分割粒径降低41%。
语种:
中文
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装配式辐射供暖供冷系统的应用前景
作者:
刘金芝;谢东(指导);王汉青;巫洋茜
期刊:
建筑节能(中英文) ,2019年47(6):122-127 ISSN:2096-9422
作者机构:
[王汉青; 刘金芝; 巫洋茜; 谢东(指导)] 建筑环境控制技术湖南省工程实验室;装配式建筑节能技术湖南省重点实验室;南华大学土木工程学院
关键词:
装配式;辐射供暖/供冷系统;发展方向
摘要:
辐射供暖供冷(RHC)系统作为保持室内热舒适的重要手段已经被广泛应用于建筑当中.通过结合装配式建筑发展的趋势,综述了装配式建筑和辐射供暖、供冷系统的研究与发展现状,并提出了装配式辐射供暖、供冷系统的概念,进一步探讨了辐射供暖供冷系统装配化技术的发展前景和未来方向.
语种:
中文
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纳米零价铁对铀尾矿库土壤中铀形态分布及固定效果的影响
作者:
周书葵;李智东;刘迎九;方丰荣;张建;...
期刊:
环境工程学报 ,2019年13(7):1727-1734 ISSN:1673-9108
通讯作者:
Zhou, S.
作者机构:
[刘迎九; 方丰荣; 田林玉; 李智东; 张建; 周书葵; 马煜琦] School of Civil Engineering, University of South China, Hengyang, 421001, China
通讯机构:
[Zhou, S.] S;School of Civil Engineering, University of South China, Hengyang, China
关键词:
铀尾矿库;污染土壤;纳米零价铁;铀固定;形态分布
摘要:
针对纳米零价铁(nZVI)对铀尾矿库土壤中铀形态分布和U(Ⅵ)固定效果影响问题,采用逐级化学提取、毒性浸出(TCLP)和磁性分离实验,利用SEM-EDS和XRD对nZVI固定前后的铀尾矿土壤进行表征;研究了nZVI在不同投加量和pH条件下,对尾矿库土壤固定前后铀的形态分布和固定效果的影响,并对nZVI的固定机理进行了探讨.结果 表明:当nZVI的投加量为8%、pH为5时,土壤中U(Ⅵ)的固定效果最好,固定后土壤中铀的毒性浸出值仅为13.98%;对经过nZVI处理后的铀尾矿土壤进行磁性分离发现,磁性和非磁性土壤重量占比分别为32.87%和67.13%,其铀含量分别达到55.05%和44.95%,说明nZVI对土壤中的U(Ⅵ)有较好的富集作用.nZVI对铀尾矿库土壤中的U(Ⅵ)有较好的原位固定和富集效果,并能减少土壤中铀的析出.
语种:
中文
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Workability and mechanical property of metakaolin phosphate acid based geopolymer
作者:
Dong, Teng;Zhang, Ying* ;Jiang, Yixuan;Zhao, Guodong;Yu, Xingyu
期刊:
IOP Conference Series: Earth and Environmental Science ,2019年267(2) ISSN:1755-1307
通讯作者:
Zhang, Ying
作者机构:
[Dong, Teng; Yu, Xingyu; Jiang, Yixuan] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Ying] Univ South China, Sch Design & Art, Hengyang 421001, Hunan, Peoples R China.;[Zhao, Guodong] Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构:
[Zhang, Ying] U;Univ South China, Sch Design & Art, Hengyang 421001, Hunan, Peoples R China.
会议名称:
3rd International Workshop on Renewable Energy and Development (IWRED)
会议时间:
MAR 08-10, 2019
会议地点:
Guangzhou, PEOPLES R CHINA
会议主办单位:
[Dong, Teng;Jiang, Yixuan;Yu, Xingyu] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.^[Zhang, Ying] Univ South China, Sch Design & Art, Hengyang 421001, Hunan, Peoples R China.^[Zhao, Guodong] Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称:
IOP Conference Series-Earth and Environmental Science
摘要:
Metakaolin and different molarity of H3PO4 were used to synthesis metakaolin phosphate acid based geopolymer (PAG) at 45°C and humidity more than 98%. The fluidity of fresh PAG decreases from 15.2 mm to 13.1 mm according to the increasing molarity of H3PO4. Initial setting time and final setting time of fresh PAG increases from 21 h to 62 h and 35 h to 87 h with the molarity of H3PO4 increase from 6 mol/L to 12 mol/L respectively. PAG is an early strength material, and the highest strength of PAG is 120.7 MPa at 28 day and strength at 7day is up to 90.8 MPa. Porosity decreases and pore size increases with the increasing molarity of H3PO4, Pore size between 50 nm and 100 nm is dominated in PAG. Some cracks was observed in hardened PAG. © Published under licence by IOP Publishing Ltd.
语种:
英文
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