固定化微生物抗Cr^6＋毒性能力及其去除特性研究  

Experimental Study on Cr^(6+) Removal Mechanism and Ability Using Immobilized Microbes

作　　者：李杰[1] 王志盈[1] 毛玉红[2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710048 [2]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《中国给水排水》2008年第1期98-101,共4页China Water & Wastewater

基　　金：兰州市科技局科技攻关项目(03-1-49)

摘　　要：采用固定化微生物SBR反应器和普通活性污泥SBR反应器处理投加了Cr6+的生活污水,考察了固定化微生物去除COD及Cr6+的能力及抗毒性,并对除铬机理作了初步探讨。结果表明:在保证对COD的去除率较稳定的条件下,固定化微生物与普通活性污泥所能承受的Cr6+浓度分别为70mg/L和1.9mg/L;污泥对Cr6+有很强的吸附及还原能力,反应器中的Cr6+最终主要以Cr3+的形式通过排放剩余污泥而被去除;在进水Cr6+浓度<70mg/L时,两个反应器中的微生物对铬的吸附基本符合Langmuir吸附等温式,这种吸附作用和微生物的量有关,而和微生物活性的关系不大。该方法为重金属废水的生物处理开辟了新思路。Microbially immobilized SBR reactor and conventional activated sludge SBR reactor were used to treat domestic sewage with Cr^6＋ addition. The removal efficiencies of COD and Cr^6＋ by immobilized microbes and their antitoxic ability were investigated, and the removal mechanism of Cr ions was discussed preliminarily. The results indicate that at stable COD removal efficiency, Cr^6＋ concentrations endured by immobilized microbes and conventional activated sludge can reach 70 mg/L and 1.9 mg/L. The sludge has stronger adsorption and reduction abilities of Cr^6＋ , and Cr^6＋ is removed with discharge of excess sludge in form of Cr^3＋. Before the influent Cr^6＋ concentration reaches 70 mg/L, the adsorption of Cr^6＋ by the microbes in the two reactors accords with Langmuir adsorption isotherm equation. The adsorption actions have relation with microbial quantities. The microbial activity has little effect on adsorption actions. This process provides a new way for the biological treatment of sewage containing heavy metals.

关 键 词：CR^6+ SBR 普通活性污泥 固定化 吸附 

分 类 号：X703[环境科学与工程—环境工程]