改良型多级A/O-MBR组合工艺对低C/N比生活污水的强化除磷

doi:10.16085/j.issn.1000-6613.2020-0874

摘要/Abstract

摘要：

采用多级厌氧/耗氧膜生物反应器（A/O-MBR）组合工艺对低C/N比生活污水进行处理时，存在总磷（TP）处理不达标的问题。通过改变污泥回流位置并增加内回流的改良型多级A/O-MBR组合工艺强化除磷，探究该工艺对低C/N比生活污水中TP的去除效果，并通过污泥静态分析研究其污泥反硝化除磷机理。结果表明，改良型多级A/O-MBR组合工艺对TP去除效果良好，平均去除率达到了86.36%，同时对化学需氧量（COD）、总氮（TN）及氨氮去除效果良好，均达到一级A排放标准。该工艺提高了聚磷菌及反硝化聚磷菌的比例，有效强化了对TP的去除。

关键词: 多级厌氧/耗氧膜生物反应器, 生活污水, 低C/N比, 反硝化除磷

Abstract:

When the low-C/N ratio domestic sewage is treated by the multi-stage A/O-MBR combination process, there is a problem that the TP removal rate is low. The removal of the phosphorus is enhanced by the improved multi-stage A/O-MBR combination process of increasing internal reflux. The removal effect of modified multi-stage A/O-MBR combination process on TP in low C/N ratio domestic sewage was studied. The mechanism of removal of modified multi-stage A/O-MBR combined process sludge denitrifying phosphorus was investigated by static analysis of sludge. The results showed that the improved multi-stage A/O-MBR combination process had good TP removal efficiency with the average removal rate of 86.36%. At the same time, the effects of COD, TN and nitrogen removal were good, and all reached the first-class A emission standard. The proportion of polyphosphate bacteria and denitrifying phosphorus accumulating bacteria were increased by the improved multi-stage A/O-MBR combination process, and the removal effect of TP by the combined process was strengthened.

Key words: multi-level A/O-MBR, domestic sewage, low C/N ratio, denitrifying phosphorus removal

中图分类号:

X703

郑凯, 张子贤, 吴勇, 王万红, 武福平. 改良型多级A/O-MBR组合工艺对低C/N比生活污水的强化除磷[J]. 化工进展, 2021, 40(3): 1675-1680.

ZHENG Kai, ZHANG Zixian, WU Yong, WANG Wanhong, WU Fuping. Improved multi-stage A/O-MBR combination process for removal of phosphorus of low C/N ratio domestic sewage[J]. Chemical Industry and Engineering Progress, 2021, 40(3): 1675-1680.

图/表 7

图1 多级A/O-MBR组合工艺流程

图2 改良型多级A/O-MBR组合工艺流程

表1 原水水质

项目

COD

/mg·L^-1

氨氮

/mg·L^-1

总氮

/mg·L^-1

总磷

/mg·L^-1

溶解氧

/mg·L^-1

范围

214.5~

369.4

35.79~

51.71

40.24~

59.45

2.680~

6.620

7.23~

7.86

0.2~

0.4

图3 各阶段对总磷的去除效果

图4 各处理单元正磷酸盐的沿程变化情况

图5 各阶段对COD、TN、氨氮的去除效果

图6 不同阶段污泥厌氧释磷、缺氧吸磷及好氧吸磷特征

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