摘要：
Wastewater produced in beryllium mining seriously affects ecological balance and causes great environmental pressure. We designed a novel porous lotus leaf biochar modified with PO43-/NH4+ multifunctional groups (MLLB) and used it for beryllium(Be) removal from beryllium mining wastewater. Kinetic and thermodynamic experiments showed that the adsorption capacity (Q(e)) of Be with MLLB from the simulated beryllium mining wastewater could reach 40.38 g kg(-1) (35 degrees C, pH = 5.5), and the adsorption process was spontaneous and endothermic. The dispersion coefficient K-d of Be with MLLB was 2.6 x 10(4) mL g(-1), which proved that MLLB had strong selective adsorption capacity for Be. Phosphoric acid, ammonia, and hydroxyl groups on the MLLB surface would complex with Be to form Be(OH)(2) and Be(NH4)PO4 complexation products, which implied that surface complexation and precipitation reactions might co-existed in the adsorption process. The above results showed that MLLB could effectively adsorb Be and prevent beryllium exposure in a beryllium mining process.
作者机构：
[于涛] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[邓话; 黄永春] China National Nuclear Corporation Jianzhong Nuclear Fuel Co. Ltd., Yibin, 644000, China;[王清良] School of Nuclear Resource Engineering, University of South China, Hengyang, 421001, China;[王孟] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China<&wdkj&>China National Nuclear Corporation Jianzhong Nuclear Fuel Co. Ltd., Yibin, 644000, China
作者机构：
[王清良; 陈鹏; 胡鄂明; 李乾] Nuclear Resources Engineering College, University of South China, Hengyang;Hunan;421001, China;Coorperative Innovation Center of Hunan Province for Nuclear Fuel Cycle Technology & Equipment, Hengyang;[王红强] Environmental and Safety Engineering College, University of south China, Hengyang
摘要：
The aqueous extract from pomegranate peel (AEPP) was used to remove Microcystis aeruginosa. The flocculating properties of the natural flocculant from pomegranate peel to M. aeruginosa were investigated, which included the factors (i.e., the particle size of the pomegranate peel, the ratio of the material to the solvent, the addition of the natural flocculant, membrane pore size and density algae) influencing the removal of the algae from solutions. The removal efficiencies of algae were found to be significantly different with the pore sizes of the used membranes for filtration. The particulate matter in the aqueous extract had good effect of aid to the coagulation. In addition, the addition of AEPP pronouncedly influenced the algae removal, giving rise to the removal efficiency up to 13.99%, 26.55%, 63.84%. and 94.63% at the addition amount of 0.5, 0.7, 1.0, and 3.0 mL, respectively. Therefore, the natural flocculant from pomegranate peel was strongly confirmed to offer the favorable characteristics in M. aeruginosa removal.
摘要：
In order to develop and apply mixed iron- and sulfur-oxidizers in uranium bioleaching, the characteristics of a mixed iron- and sulfur-oxidizing consortium (Consortium ISO) were comparatively investigated versus an iron-oxidizing consortium (Consortium IO). The results showed, the Consortium ISO exerted stronger oxidative ability and acid-producing ability than Consortium IO did. The synergy of sulfur-oxidizers and iron-oxidizers could change the structure and properties of the passivation substance, and work positively for eliminating the accumulation of passivation substance. In the bioleaching process, the uranium bioleaching experiments showed the recovery percentage of uranium reached 99.5% with Consortium ISO, 6.3% more than that of Consortium IO.
作者机构：
[王清良; 李乾; 胡鄂明; 李中; 冯志刚] School of Nuclear Resource Engineering, University of South China, Hengyang, China;[成泉辉] No. 6 Smelting Plant, Hunan Shuikoushan Nonferrous Metals Group Co., Ltd., Hengyang, China
作者机构：
[熊骁; 王清良; 李乾; 胡鄂明; 冯志钢; 李中; 王星星] School of Nuclear Resource Engineering, University of South China, Hengyang;421001, China;[熊骁; 王清良; 李乾; 胡鄂明; 冯志钢; 李中; 王星星] 421001, China
通讯机构：
School of Nuclear Resource Engineering, University of South China, Hengyang, China
摘要：
A defined mixed bioleaching consortium (constructed by Acidithiobacills ferrooxidans ATCC 23270, Leptospirillum ferriphilum YSK, Sulfobacillus thermosulfidooxidans ST, Acidithiobacills thiooxidans A01 and Acidithiobacills caldus S1) was used to investigate the fluoride stress response. The results showed that its growth and iron oxidation rate were obviously inhibited, while the sulphur oxidation was only barely restrained. Furthermore, the community dynamics and gene expression were assayed respectively by using real-time quantitative polymerase chain reaction assay (RT-PCR) and functional gene arrays (FGAs). From the analysis of community dynamics, the most obviously inhibited strains were S. thermosulfidooxidans ST, while L. ferriphilum YSK still maintained stable growth. After 4.8 mM of fluoride stress for 28 h, the S. thermosulfidooxidans cell concentration was decreased by about 517.8 times more than in non-stress state. From the analysis of gene expression, fluoride stress was seen to exert pleiotropic effects on different species in the consortium. The dominant species played the pivotal role in resisting fluoride stress and maintaining activities in the system, yet the inferior species also had a critical function of assisting the survival of the dominant species.
