污水生物除磷若干影响因素分析

Influencing factors of biological phosphorus removal in sewage treatment

在系统阐述污水生物除磷机理的基础上,深入分析了微生物群体平衡、城市污水水质、环境因子以及工艺运行参数和运行方式等方面对生物除磷效果的影响。分析结果表明:生物除磷系统的溶解氧浓度不宜太高,一般好氧区DO<2 mg/L,厌氧区DO<0.2 mg/L;厌氧段存在硝酸盐对生物释磷有负面影响,缺氧段存在一定浓度的硝酸盐有利于生物聚磷;碳源必须充分、易降解;TKN/COD<0.1的城市污水有利于生物除磷;pH偏碱性可提高生物除磷效率;低温对生物除磷效果影响不明显。

Based on the introduction of mechanism of biological phosphorus removal, the influences of microorganisms＇ population balance, wastewater quality, environmental factors, operating parameters and manner on phosphorus removal effect were adequately analyzed in this paper. Among all influencing factors, too high dissolved oxygen （DO） concentration must be avoided, which in aerobic zone should be less than 2 mg/L and which in anaerobic zone less 0. 2 mg/L. Nitrate in anaerobic zone exhibited negative effect on phosphorus release, but certain concentration of nitrate in anoxic zone was beneficial to phosphorus accumulation. Carbon source must be adequate and easily degraded. Municipal wastewater with TKN/COD 〈 0. 1 was helpful to biological phosphorus removal. Alkalescent environment could increase the effect of phosphorus removal. The influence of low temperature on phosphorus removal was not evident.