摘要：
Anthraquinone-2-sulfonate (AQS) was employed in humus substitutes to evaluate the effects and influencing factors of U(VI) reduction-by Shewanella oneidensis MR-1 (S. oneidensis MR-1) under anaerobic-condition. The removal rate of U(VI) at 30 ℃ reaches 99.0% afterd 96 h with the pH value of 7.0 and AQS concentration of 1.0 mmol/L. The effective concentrations of AQS as the accelerator for U(VI) bioreduction are approximately 0.5-1.0 mmol/L. The bioreduction of U(VI) is inhibited when the concentration of AQS exceeds 2.0 mmol/L. The coexistence of ions, such as Cu~(2+), Cr~(6+), Mn~(2+), shows a remarkable negative effect on the U(VI) reduction, and Zn~(2+) shows less influence on the process compared with other tested ions. The U(VI) reduction is remarkably inhibited when the concentration of nitrate ion exceeds 1.0-mmol/L. Otherwise, no difference is found when the nitrate ion concentration is less than 0.5 mmol/L. Sulfate ion (<5.0 mmol/L) slightly promotes the U(VI) reduction. Zero-valent iron (ZVI) promotes the U(VI) reduction by S. oneidensis, and the reduction rate improves with increasing the amount of ZVI in the range of 0-2.0 g/L. The XPS result indicates that uranium deposits on the cell surface are in U(VI) and U(IV) forms, and the majority of uranium in the solution is stable UO_2.
作者机构：
[刘迎九; 蔡婷; 谢水波; 吴宇琦; 凌辉] Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China;[罗志平] Hunan Provincial Nuclear Agriculture Sciences and Space Mutation Breeding Research Institute, Changsha, 410125, China
作者机构：
[江海浩; 刘迎九; 康丽; 方良; 邓文静; 周书葵] School of Urban Construction, University of South China, Hengyang, China;[Zeng, Guang-Ming; 周书葵] School of Environment Science and Engineering, Hunan University, Changsha, China
通讯机构：
School of Urban Construction, University of South China, Hengyang, China
期刊：
Water Science and Technology,2015年71(5):725-733 ISSN：0273-1223
通讯作者：
Li Dong
作者机构：
[Xie Shuibo; Liu Yingjiu; Zeng Taotao] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.;[Zhang Jie; Zeng Huiping; Li Dong] Beijing Univ Technol, Key Lab Beijing Water Qual Sci & Water Environm R, Beijing 100124, Peoples R China.;[Qiu Wenxin] Beijing Gen Municipal Engn Design & Res Inst Co L, Beijing 100082, Peoples R China.;[Zhang Jie] Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China.
通讯机构：
[Li Dong] B;Beijing Univ Technol, Key Lab Beijing Water Qual Sci & Water Environm R, Beijing 100124, Peoples R China.
摘要：
An upflow anaerobic biofilter (AF) was developed to investigate anaerobic ammonium-oxidizing (ANAMMOX) efficiency in treating low-strength wastewater at ambient temperature (15.3-23.2 degrees C). Denaturing gradient gel electrophoresis (DGGE) and fluorescence in situ hybridization were used to investigate treatment effects on the microbial community. Stepwise decreases in influent ammonia concentration could help ANAMMOX bacteria selectively acclimate to low-ammonia conditions. With an influent ammonia concentration of 46.5 mg/L, the AF reactor obtained an average nitrogen removal rate of 2.26 kg/(m(3) day), and a removal efficiency of 75.9%. polymerase chain reaction-DGGE results showed that microbial diversity in the low matrix was greater than in the high matrix. Microbial community structures changed when the influent ammonia concentration decreased. The genus of functional ANAMMOX bacteria was Candidatus Kuenenia stuttgartiensis, which remained stationary across study phases. Visual observation revealed that the relative proportions of ANAMMOX bacteria decreased from 41.6 to 36.3% across three study phases. The AF bioreactor successfully maintained high activity due to the ANAMMOX bacteria adaptation to low temperature and substrate conditions.
作者机构：
[唐振平; 苑士超; 刘迎九] Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang 421001, China;Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China;[刘金香; 谢水波; 李仕友] Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang 421001, China, Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China
通讯机构：
[Xie, S.] H;Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, China
作者机构：
[Jiang H.; Liu Y.] School of Urban Construction, University of south China, Hengyang, 421001, China;[Zeng G.] School of Environment Science and Engineering, Hunan University, Changsha, 410082, China;[Zhou S.] School of Urban Construction, University of south China, Hengyang, 421001, China, School of Environment Science and Engineering, Hunan University, Changsha, 410082, China
通讯机构：
[Zhou, S.] S;School of Urban Construction, , Hengyang, 421001, China
会议名称：
2012 International Conference on Advances in Materials Science and Engineering(AMSE 2012)
会议时间：
2012-12-09
会议地点：
Seoul,Korea
关键词：
Adsorption mechanism;Modified CMC;U(VI)
摘要：
The modified carboxymethyl cellulose(CMC) was prepared and explored to adsorb uranium(Ⅵ) ions from aqueous solution in a batch system. The experimental results showed that on the condition of reaction temperature 70~80°C, CMC 30%-35% (w/w), CMC to AA (w/w) of 10:2.5 and reaction time 3.5-4 h, the modification effect was the best. High removal efficient of U(Ⅵ) was obtained 97.1% at temperature of 25°C, pH value of 5.0, dosage of modified CMC 0.1 g/L and contact time of 60 min. It was found that the adsorption process was best described by Freundlich model and pseudo-first-order kinetic model (R2=0.9618), indicating that the adsorption is mainly on the surface of the modified CMC. Thermodynamics parameters of negative value of ΔG0 and positive value of ΔH0 revealed the spontaneity and endothermic nature of the adsorption. The adsorption is primarily due to physical adsorption.
作者机构：
[刘金香; 刘迎九; 王劲松; 段毅; 谢水波] Key Laboratory of Pollution Control and Resources Reuse Technology of Hunan Province, University of South China, Hengyang 421001, Hunan, China;[谢水波] Key Discipline Lab. of National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, Hunan, China
通讯机构：
Key Laboratory of Pollution Control and Resources Reuse Technology of Hunan Province, University of South China, China
作者机构：
[张亚萍1; 刘海燕1; 刘迎九1; 谢水波1,2; 王劲松1] School of Urban Construction, University of South China, Hengyang 421001, China;[李仕友2; 谢水波1,2; 刘金香2] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China
通讯机构：
School of Urban Construction, University of South China, China
