碳磷比对厌氧/好氧/缺氧-序批式反应器工艺脱氮除磷性能的影响

Effects of C/P on nitrogen and phosphorus removal performance by AOA-SBR process

研究了不同碳磷比(C/P)条件下厌氧/好氧/缺氧(AOA)-序批式反应器(SBR)工艺的脱氮除磷特性,主要考察了C/P(以质量比计)分别为40、24、17的情况。结果显示,C/P对化学需氧量和氨氮的去除几乎没有影响,对总氮的去除有一定影响,对总磷(TP)的去除影响较大。适当降低C/P有利于提升释磷量,但可能会降低最终的TP去除量。在好氧段,氨氮会大量转化为硝态氮;在缺氧段,硝态氮被反硝化去除。AOA-SBR工艺中存在着明显的聚磷菌和反硝化聚磷菌聚集现象,但随着C/P的降低聚糖菌会增加,除磷方式会由聚磷菌单一除磷演替为聚磷菌与反硝化聚磷菌协同除磷。

The nitrogen and phosphorus removal characteristics by AOA-SBR process under different C/P was studied with C/P(taken as mass ratio)of 40,24 and 17,respectively.Results showed that C/P had little effect on COD and ammonia nitrogen removal,slight effect on TN removal,and great effect on TP removal.An approriate reduction of C/P was beneficial to phosphorus releasing,but unbeneficial to fianl TP removal amount.During aerobic stage,large amount of ammonia nitrogen transferred into nitrate nitrogen,and nitrate nitrogen was removed by denitrification during anoxia stage.Phosphate accumulating bacteria and denitrifying phosphorus accumulating bacteria were gathered in AOA-SBR process,but glycogen accumulating bacteria increased as C/P declining.Thus,phosphorus removal mechanism was collaboration by phosphate accumulating bacteria and denitrifying phosphorus accumulating bacteria instead of single phosphate accumulating bacteria.