低负荷运行对城市污水生物除磷的影响

Impact of Loading on Biological Phosphorus Removal from Municipal Sewage

针对目前国内较多的城市污水处理厂长期处于低负荷运转的状态,进行了现场生产性与静态模型的试验研究。结果表明,长期低负荷运行是导致生物除磷效率下降的主要原因。长期低负荷运行使聚磷菌微生物细胞内储存物质(PHB、Glycogen、poly-P等)含量下降,使生物除磷能力丧失。为了保证生物脱氮除磷处理系统的除磷效率,可通过调节生化反应容积、控制好氧区的曝气等手段,使处理系统的负荷控制在适合的范围内。

Aimed at the status of long-time operation under low loading in the municipal sewage treatment plant, the full-scale and static-model tests have been investigated. The test results showed that the deterioration of biological phosphorus removal has been attributed to long-time operation under low loading, which led to the depletion of the deposited substrates(PHB, Glycogen,poly-P) in the cell of bio-P and the deterioration of biological phosphorus removal capacity. In order to keep the efficiency of P-removal in the biological nitrogen and phosphorus removal system, an adequate and flexible controlling volume of biochemical reactor and the aeration in the aerobic have been done,which will control the treatment system in compatible range.