同步化学除磷对A^(2)O性能影响及微生物特性研究

Study on Effect of Simultaneous Chemical Phosphorus Removal on A^(2)O Performance and Microbial Characteristics

为强化厌氧-缺氧-好氧(A^(2)O)工艺深度处理城市污水中的TP,满足GB 3838-2002的地表IV水体要求(TP的质量浓度<0.3 mg/L),采用FeSO_(4)作为同步除磷研究,考察Fe盐同步化学除磷对A^(2)O工艺脱氮除磷性能和污泥沉降性能的影响,并解析该过程的微生物群落特性。结果表明,Fe2+投加可保证出水TP的质量浓度<0.3 mg/L,且对COD的去除效果和去除速率影响较小;且同步化学除磷可改善脱氮性能和污泥沉降性能。Fe盐投加对Bacteroidetes的影响较小,Saccharibacteria和Acidobacteria的丰度在Fe盐投加后显著下降,Actinobacteria菌群随着Fe盐投加组运行时间的增加。

In order to strengthen the advanced treatment of total phosphorus(TP) in municipal wastewater by anaerobic/anoxic/aerobic(A^(2)O) process,and meet the requirements of surface water class IV standard of GB 3838-2002(mass concentration of TP < 0.3 mg/L), FeSO_(4) was used as simultaneous phosphorus removal, the effect of Fe salt simultaneous chemical phosphorus removal on the nitrogen and phosphorus removal performance and sludge settling performance of the A^(2)O process were investigated, and the microbial community characteristics of the process was analyzed. The results showed that the addition of Fe2+could guarantee the mass concentration of TP in effluent was lower than 0.3 mg/L, And it had little effect on the removal effect and removal rate of COD. Meanwhile, simultaneous chemical phosphorus removal could improve the nitrogen removal and sludge settling performances. Fe salt dosing had little effect on Bacteroidetes, and the abundance of Saccharacteria and Acidobacteria decreased significantly after adding Fe salt. The Actinobacteria flora increased with the running time of the Fe salt dosing group.