Fe3+对活性污泥系统的影响

通过小试研究了微量Fe3+对活性污泥系统的影响.将浓度为3 mg/L,5 mg/L,10 mg/L,20 mg/L,30 mg/L,50 mg/L和80 mg/L的Fe3+分别投加到活性污泥系统中,反应4 h后测定系统出水COD、活性污泥的SVI、脱氢酶活性及其EPS组分.结果表明,Fe3+浓度小于50 mg/L时对活性污泥的脱氢酶活性具有促进作用,浓度为10 mg/L时促进作用最强;Fe3+浓度在80 mg/L以下均具有良好的絮凝作用,浓度在30 mg/L以下时絮凝作用最强.两种作用的共同结果影响系统对COD的去除效果.对活性污泥EPS组分的测定表明,Fe3+的絮凝作用对SVI的影响是主要的.

Fe3+ effect on activated sludge system

The effect of microcontent of Fe3 + on activated sludge system (ASS) was researched by bench-scale experiment. Fe3 + in dosages of 3 mg/L, 5 mg/L, 10 mg/L, 20 mg/L, 30 mg/L, 50 mg/L and 80 mg/L was dropped into ASS and four hours latter the effluent was examined for COD, SVI, dehydrogenase activity and EPS content. The results show that the acceleration to dehydrogenase activity of the activated sludge begins in case when Fe 3+ concentration less than 50 mg/L, and it is maximum when Fe3+ =10 mg/L. Fair coagulation was observed at Fe3+ less than 80 mg/L, best at Fe3+=30 mg/L. The combined action of above mentioned two has effect on the COD removal. This has been approved by EPS examination of activated sludge.