【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。更多还原

【Abstract】 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.更多还原