以低C/N比污水为处理对象、基于物料平衡分析,研究了在MUCT工艺中硝化液内循环比与COD降解转化、PHA的代谢、磷的转移以及氮的转化等4个过程的关系.进水COD浓度恒定为(290±10)mg/L,TN浓度恒定为(55±0.5)mg/L,TP浓度恒定为(7.0±0.5)mg/L,改变硝化液内循环比,测定各反应段及出水COD、TN、TP浓度以及污泥中的PHA含量.试验结果表明:厌氧段去除的COD的63％～67％左右转化为PHA,在第二缺氧段和好氧段,PHA被消耗用于吸收污水中的磷,硝化液内循环比对第二缺氧段的消耗量有较明显的影响；硝化液内循环比对磷的释放过程影响较小,是第二缺氧段的吸磷过程的主要影响因素.%Based on mass balances, relationships between the nitrified liquor recycling condition and COD removal, phosphorus release, phosphorus uptake, nitration, denitrification were discussed by using low C/N rate wastewater as the research object, in which the influent chemical oxygen demand concentration was stabilized at (290±10)mg/L, the influent total nitrogen (TN) concentration was stabilized at (55±0.5)mg/L, the influent total phosphorus (TP) concentration was stabilized at (7.0±0.5)mg/L. The nitrified liquor recycling condition was changed to compare the effluent total nitrogen and total phosphorus concentration. The experimental results show that 63%~67% of the COD removed in the anaerobic zone can be identified as PHA; in the second anoxic and aerobic zone, the PHA has been consumed for phosphate uptake, consumption of PHA is significantly affected by nitrified liquor recycling condition in second anoxic zone; nitrified liquor recycling condition has little effect on phosphorus release, but it is a key factor affecting phosphorus uptake in the second anoxic zone.
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