某工业园区污水处理厂工艺诊断和优化运行研究

Study on the Process Diagnosis and Optimizing Operation of a WWTP in Industrial Park

针对某工业园区污水处理厂出水COD、TN、NH_3-N和TP超标问题,采用标准化污水处理厂工艺运行诊断方法,结合工业废水特征,对污水处理厂二期运行现状进行评估分析,发现存在的问题主要为进水量超负荷运行、进水TP波动大且溶解性有机磷浓度高,预处理单元转鼓细格栅故障频繁、水解酸化池堵塞以及跌水复氧现象显著,生物处理单元生物除磷能力丧失、内回流混合液DO浓度高及温度对脱氮能力影响大。针对上述问题,提出三期工程扩建、预处理段设施改造、预处理段跌水复氧控制、化学除磷药剂投加点优化、内回流混合液DO控制和强化脱氮措施的季节性调整6项优化运行措施,保障出水稳定达标的同时实现节能降耗。

The effluent COD、TN、NH3-N and TP of a WWTP in industrial park could not stably reach the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).By using a standardized process operation diagnosis method of WWTP and combining with the characteristics of industrial wastewater,the paper evaluated operation status of the second phase of the WWTP.There were some problems such as water quantity overloading,great TP fluctuation and high dissolved organic phosphorus concentration in the influent,frequent faults of rotary drum fine screen,blocking of hydrolytic acidizing tank and waterfall oxygenation in pretreatment system,the deterioration of biological phosphorus removal capacity,high DO concentration in internal reflux mixture and temperature affecting nitrogen removal in biological treatment system.In view of the above problems,six measures including extension of the third phase project,facility transformation of pretreatment system,control of waterfall oxygenation,optimization of phosphorus removal chemical,establishing oxygen consumption zone and enhancing nitrogen removal in winter,were put forward to ensure the effluent quality stably up to the drainage control standard and energy saving and consumption reduction.