兼氧/厌氧条件下pH和温度对活性污泥异化还原Fe(Ⅲ)的影响  

Effects of pH and Temperature on the Dissimilatory Reduction of Fe(Ⅲ) by Activated Sludge under Anoxic/anaerobic Condition

作　　者：翟思媛[1] 王亚娥[1] 魏志勇[1] 李杰[1] 

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070

出　　处：《应用与环境生物学报》2013年第6期1040-1045,共6页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(51068015)资助~~

摘　　要：采用兼性厌氧/严格厌氧恒温培养,投加Fe2O3粉为Fe(Ⅲ)源对铁还原菌富集培养,考察活性污泥体系中不同的初始pH和温度条件下异化Fe(Ⅲ)还原特性的变化.结果表明:(1)活性污泥体系的初始pH中性偏碱性时,Fe(Ⅲ)的异化还原性能较好,且体系的pH值最终达到平衡(pH=8左右);(2)在15℃、25℃和35℃控温条件下,活性污泥体系内异化Fe(Ⅲ)还原过程的Fe(Ⅱ)累积量和Fe(Ⅱ)的累积速率均与温度成正相关,兼氧时Fe(Ⅱ)的累积速率分别为15.62、28.11和2 8.52 mg L-1 d-1,厌氧时分别为19.65、28.57和35.17 mg L-1 d-1;(3)综合整体试验,兼氧/厌氧条件下异化Fe(Ⅲ)还原特性无明显差异.研究为强化污水治理工艺的异化铁还原过程提供了理论依据.This research aimed to study the dissimilatory Fe（Ⅲ） reduction characteristics by conventional activated sludge under different initial pH and temperature conditions. The static cultivation experiments were conducted under a constant temperature at anoxic/anaerobic condition, with Fe2O3 added as Fe （Ⅲ） source for enrichment culture of iron reducing bacteria. The results showed that： （1） The initial pH value of neutral by alkaline in the activated sludge system was favorable to Fe（Ⅲ） dissimilatory reducing process of activated sludge microorganism, with the pH value reaching final balance at around 8; （2） At the controlled temperatures of 15 ℃, 25 ℃ and 35 ℃, the cumulative amount and rate of Fe（Ⅱ） were positively correlated with temperature, with the corresponding Fe（Ⅱ） accumulation rates as 15.62, 28.11 and 28.52 mg L-1 d-1, respectively under anoxic condition, and 19.65, 28.57 and 35.17 mg L-1 d-1 under anaerobic condition; （3） From the overall experiment, the difference of the IRB reduction characteristics was not obvious under anoxic/anaerobic conditions. This research provided a theoretical basis for strengthening dissimilatory reduction of Fe（Ⅲ） of sewage treatment process.

关 键 词：活性污泥 铁还原菌 富集培养 还原特性 影响因素 

分 类 号：X172[环境科学与工程—环境科学] X703