Mo^(6+)对活性污泥系统反硝化性能的影响  

Effects of molybdenum(Ⅵ) on denitrification performance of the activated sludge process

作　　者：孟雪征[1] 曹相生[2] 曹磊 

机构地区：[1]重庆大学城市建设与环境工程学院,重庆400045 [2]北京工业大学建工学院水质科学与水环境恢复工程北京市重点实验室,北京100022 [3]山东省莱州市建筑工程质量监督站,山东莱州261400

出　　处：《生态环境》2006年第2期216-218,共3页Ecology and Environmnet

摘　　要：采用对比实验的方法,在不同初始硝酸盐氮和COD质量浓度的条件下,对人工模拟的活性污泥系统投加不同质量浓度的Mo6+,以此考察Mo6+对活性污泥系统反硝化性能的影响。结果发现,Mo6+的质量浓度小于5mg?L-1以下时能够促进硝酸盐氮的去除,质量浓度为1mg?L-1时促进效果最好。Mo6+的质量浓度在4mg?L-1以下时,可以使COD去除效率增加,质量浓度为2mg?L-1时有最佳促进作用。Mo6+的质量浓度小于1g?L-1时可提高反硝化活性污泥的TTC-脱氢酶活性,过高质量浓度则表现出抑制作用。综合Mo6+的对硝酸盐氮和COD去除的影响规律以及对活性污泥TTC-脱氢酶活性的影响,认为Mo6+在质量浓度为1mg?L-1时对反硝化的促进作用最强。Effects of molybdenum（Ⅵ） on denitrification performance of activated sludge process were investigated by a lab-scale once-though activated sludge unit treating synthetic wastewater with different influent strengths [20-60 mg · L^-1 nitrate with 150-500 mg ·L^-1 chemical oxygen command （COD）] and containing 0-5 mg ·L^-1 Mo （Ⅵ）. Nitrate and COD varieties during the reaction were studied with 2,3,5-triphenyl tetrazoliumchloride dehydrogenase activity （TTC-DHA） of activated sludge analyses. All results showed that, molybdenum could accelerate nitrate removal within 5 mg ·L^-1 concentration with the best stimulation effect appear at 1 mg ·L^-1. Within 4 mg ·L^-1 concentration, molybdenum has beneficial effect on COD removal with the best stimulation effect appear at 2 mg·L^-1. Within 1 mg·L^-1, TTC-DHA of activated sludge is enhanced while higher concentration of molybdenum shows inhibition effect. Based on the integrated effect of molybdenum on nitrate and COD removal, 1 mg ·L^-1 concentration of molybdenum is put forward as the best quantity for denitrification of activated sludge.

关 键 词：反硝化 六价钼 TTC-脱氢酶活性 活性污泥 

分 类 号：X703.1[环境科学与工程—环境工程]