摘要：
Abstract: In recent years, domestic and foreign researchers have used lead and zinc tailings to prepare green building materials for analysis. The preparation of geopolymers and foamed ceramics from lead-zinc tailings is discussed; and the reduction of heavy metal solidification and radiation pro-tection of lead-zinc tailings-based building materials is introduced. Research indicates that the lead-zinc tailings-based green building materials have high strength, heavy metal curing and radi-ation protection. Finally, the application and prospect of lead-zinc tailings in the field of building materials are analyzed, which provides a theoretical basis for the researchers in the field.#@#@#摘要: 对近几年国内外科研人员利用铅锌尾矿制备绿色建筑材料进行分析。从利用铅锌尾矿制备地聚物、发泡陶瓷进行主要论述；并简单介绍了铅锌尾矿基建筑材料的重金属固化及防辐射能力；研究结果表明：铅锌尾矿基绿色建筑材料具有高强、重金属固化以及防辐射等性能。最后对铅锌尾矿在建筑材料领域的应用进行了分析与前景展望，为后期在该领域探索的科研工作者提供理论依据。
作者：
Zeng, Taotao*;Rene, Eldon R.;Zhang, Shiqi;Lens, Piet N. L.
期刊：
Process Safety and Environmental Protection,2019年126:150-159 ISSN：0957-5820
通讯作者：
Zeng, Taotao
作者机构：
[Zeng, Taotao; Zhang, Shiqi] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang, Peoples R China.;[Rene, Eldon R.; Zeng, Taotao; Lens, Piet N. L.] UNESCO IHE Inst Water Educ, NL-2601 DA Delft, Netherlands.
通讯机构：
[Zeng, Taotao] U;Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang, Peoples R China.
关键词：
Selenate;Cadmium;Anaerobic granular sludge;Autoclaved biomass;Microbial community
摘要：
The main aim of this work was to evaluate the simultaneous removal of Se(VI) and Cd(II) by anaerobic granular sludge in batch tests. The anaerobic sludge completely removed 10 mg/L Se(VI) and 20 mM (1800 mg/L) lactate within 1.5 d of batch incubation. After 7 d of incubation, 90.7% and 87.7% of 5 mg/L Cd(II) were removed by the sludge in, respectively, the absence or presence of Se(VI). Compared to experiments with autoclaved biomass, Se(VI) and total Se removal 98% and 70 was mainly due to bioreduction instead of adsorption onto anaerobic granular sludge. The increase in the protein and polysaccharide content of the extracellular polymeric substances (EPS) contributed to the adsorption of total Se and Cd(II). The predominant bacterial composition of the samples from the different treatments was similar. However, the abundance of genera in the microbial community gradually changed over the treatment time depending on the Se and/or Cd exposure. Se, as an environmental factor, had a positive impact on the dominance of the Methanosaeta, Syntrophobacter and Methanobacterium genera, while Cd had a positive impact on the dominance of the Methanosaeta genus. (C) 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
期刊：
Numerical Heat Transfer, Part B: Fundamentals,2019年75(4):265-288 ISSN：1040-7790
通讯作者：
Zhao, Fu-Yun
作者机构：
[Wang, Lei; Zhang, Dong-Dong; Zhao, Fu-Yun] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China;[Wang, Lei; Zhang, Dong-Dong; Zhao, Fu-Yun] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China;[Wang, Lei; Zhang, Dong-Dong; Zhao, Fu-Yun] Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Hubei, Peoples R China;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Hubei, Peoples R China.
摘要：
In former theoretical researches of nanofluid flows, numerical investigations could not agree with experimental observations, particularly regarding whether the mixing nanoparticles will enhance or deteriorate the heat transfer. In the present work, thermal driven buoyancy flows of nanofluids in a square enclosure were modeled by the use of homogeneous assumptions and the effective kinematic viscosity and thermal conductivity formulas. Thoroughly developed heat transfer coefficient is subsequently proposed, aiming to critically evaluate the performance of nanofluid heat transport. Numerical results are presented over a wide range of thermal Rayleigh number (10(3) <= Ra <= 10(6)) and nanoparticles volume fraction (0.001 <= phi <= 0.04). Present modeling results accurately predict both the enhancement and deterioration of the natural convection heat transfer, fully validated by former experimental observations. Overall, mathematical models and Nusselt number definitions proposed in the present work effectively enhance the reliability of numerical modeling researches on the nanofluid heat transfer. Present clarification research on the Nusselt unifications could benefit future development of thermal carrier fluid enhanced by nano-particles.
摘要：
This paper presents a study on the impact of incoming wind velocity magnitudes and horizontal aperture separations on natural ventilation flows in a single-sided wind-driven naturally ventilated building with two apertures (SS2) on the rear wall or the front wall. Both the velocity fields and the contaminant concentration fields were simulated and investigated. The present study is based on CFD simulations with unsteady Reynolds-averaged Navier-Stokes (URANS) SST k-ω model. A vortex shedding flow mechanism has been identified when the two apertures are mounted either on the rear wall or on the front wall, through which the air flow oscillates at a certain rate. CFD results further demonstrate that the oscillating frequency increases with the incoming wind magnitude and is nearly independent of the horizontal aperture separations. For the same building configuration, the root mean square (r.m.s) of the non-dimensional ventilation flow rate is independent of the incoming wind speed, whereas it decreases when the horizontal aperture separation is reduced. The time-averaged contaminant concentration fields also validated the different ventilation performance of different aperture configurations. This novel ventilation mechanism could be applied to alleviate the poor ventilation performance of buildings with single-sided apertures.
