黑暗条件下不同接种比菌藻共生处理污水性能

Consortium of Chlorella-Activated Sludge with Different Inoculum Ratios for Wastewater Treatment under Dark Condition

采用黑暗异养模拟小球藻(Chlorella sorokiniana)和活性污泥共生在光线不足时的异养代谢,评估两者是否仍能发挥协同作用。结果表明,通过调控菌藻比,初始菌藻比1:2时(R2),与活性污泥(R0)相比,R2对NH4+-N和磷的去除率分别提高了6和10百分点,对COD无协同效果。菌藻共生使絮体粒径增大,从而改善了沉降性和出水浊度。藻类对MLSS的增长没有影响,且菌藻共生的有机物含量(ρ(MLVSS)/ρ(MLSS))高于活性污泥,藻类持留的叶绿素a使其在光线恢复时进行光合作用。表明菌藻共生在光线不足时仍具备强化去除氮磷的能力,对其他指标无不利影响。

Dark heterotrophic of Chlorella sorokiniana and activated sludge were used to simulate the heterotrophic metabolism of the consortium under light-limited condition,so as to evaluate whether synergistic effect of the both was still existed.Results showed that,compared with the activated sludge(R0),R2 with initial bacteria/algae ratio of 1:2 increased the removal rate of ammonia nitrogen and phosphorus by 6%and 10%,respectively,and R2 had no synergistic effect on COD.The increase of flocs particle size guaranteed the sedimentation and turbidity of effluent.Algae had no effect on the growth of MLSS,and ratio ofρ(MLVSS)/ρ(MLSS)in the consortium was higher than that of activated sludge.The chlorophyll a retained in algae made it possible to switch to photosynthesis when light was available.Overall,consortium of bacteria and algae still had the ability to enhance the removal of nitrogen and phosphorus when light was insufficient,with no adverse effect on other indices.