摘要
利用酵母融合菌RJ与活性污泥曝气处理含镍废水。实验结果表明,融合菌对废水中的镍具有很强的富集性能,投加10g/L菌体,处理20mg/L含镍废水,去除率可达70.10%;同时投加6g/L活性污泥,去除率上升到80.73%,出水固液分离效果得到改善;且融合菌的pH值适用范围较广,当pH=3～9时,去除率均在75%以上;溶解氧是影响曝气生物吸附的重要因素,在缺氧或富氧环境下,生物吸附会受到抑制,DO为2.5～4.5mg/L时吸附效果较好;融合菌-活性污泥曝气处理不同浓度Ni2+的吸附等温线符合Freundlich模型,相关系数为0.9975。
The present paper is aimed at studying the capability of aeration treatment of nickel-contained wastewater by yeast fused strain-activated sludge. In recent years, biosorption has been widely used for treating heavy metal sewage for its extensive strains source for its simple operation and high reaction rate compared with the conventional methods such as chemical precipitation, biosorption on activated carbon, ion exchange and membrane processing. But, as is known, it is very difficult to separate biomass from the treated solution for most of the ordinary biological adsorbing materials accumulate nickel inefficiently. To solve the problems, it is suggested to fuse the yeast with strain RJ and combine the activated sludge for nickel-contained sewage treating. The experimental results indicate that RJ can accumulate nickel effectively from aqueous solution： the removal ratio of 20 mg/L nickel is 70.10% when the strain dosage is 10 g/L. With 6 g/L activated sludge added in the solution the ratio has increased to 80.73% . This is due to the steady and favored environment for biosorption created by the activated sludge. Then, 5 rain effluent settling is clarified as a result of sludge flocculation. A pH assay shows that the yeast fused strain can accumulate Ni^2＋ effectively over a broad range of pH = 3-9 with the removing rate well over 75%. The paper has also studied the performance of aeration biosorption under different DO. Experimental results show that the biosorption of Ni^2＋ is constrained in the oxygen-deficient and oxygen-affluent environment, with the optimal DO being 2.5 - 4.5 mg/L. The paper has also studied the kinetic process of aeration biosorption of Ni^2＋ by using the classical Langmuir and Freundlich kinetic models simultaneously to describe the process. The result shows that the aeration biosorption of Ni^2＋ by fusing yeast into the strain-activated sludge is a complex bioaccumulation process and the saturation capacity of nickel （Ⅱ） ion of the biosorption is in far excess of that of monomolecular physical adsorption.
出处
《安全与环境学报》
CAS
CSCD
2005年第4期8-10,共3页
Journal of Safety and Environment
基金
国家自然科学基金资助项目(50278040)
广东省科技计划项目资助项目(2003C32103)
广东省科技计划重大专项(2004A30308002)
关键词
环境工程
酵母融合菌
活性污泥
镍
曝气
生物吸附
environmental engineering
yeast fused strain
activated sludge
nickel
aeration
biosorption
