Fe2（SO4）3对活性污泥微生物活性的影响

摘要

为了解Fe2（SO4）3作为絮凝剂对活性污泥中微生物活性的影响,向活性污泥系统中投加质量浓度为20、40、60、80,100 mg.L-1的Fe2（SO4）3,反应4 h后测定活性污泥的脱氢酶活性、比耗氧速率（RSOU）、胞外聚合物（EPS）及各组分含量,同时测定系统出水的COD等各项指标.结果表明：Fe2（SO4）3质量浓度在20～60 mg.L-1时对活性污泥的脱氢酶活性、RSOU、EPS及各组分含量影响均不大,此时污水中COD、TP、UV254等污染物随Fe2（SO4）3质量浓度增加而有较大幅度去除.Fe2（SO4）3质量浓度为80 mg.L-1时,污泥的脱氢酶活性、RSOU、总EPS含量均明显下降.当Fe2（SO4）3质量浓度增加到100 mg.L-1时,污泥的脱氢酶活性、RSOU进一步受到抑制,而总EPS含量则大幅度提升.此时污水中COD、TP、UV254等污染物去除率增加幅度变缓,SCOD及NH3-N去除作用有所下降.%To study the effect of Fe2（SO4）3 as flocculant on microbial activity of activated sludge,Fe2（SO4）3 in dosages of 20,40,60,80,100 mg·L-1 was dropped into ASS and four hours latter DHA,RSOU and EPS content were examined as well as COD et al.The results showed that DHA,RSOU and EPS content were insensitive to Fe2（SO4）3 in range of 20-60 mg·L-1,and the removal rates of COD,TP and UV254 in effluent increased greatly with the concentration of Fe2（SO4）3increased.When the concentration of Fe2（SO4）3 was 80 mg·L-1,DHA,RSOU and EPS content decreased distinctly.When the concentration of Fe2（SO4）3 was 100 mg·L-1,DHA and RSOU were inhibited further,whereas total EPS content increased greatly.Meanwhile the removal rates of COD,TP and UV254 in effluent increased slowly,and the removal rates of SCOD and NH3-N tended to decline.