城镇污水处理厂氮磷去除潜力评估

Potential Assessment of Nitrogen and Phosphorus Removal for Municipal Wastewater Treatment Plant

为城镇污水厂提标改造提供技术支持,以12家太湖流域城镇污水厂为研究对象,对其出水数据进行统计分析,评估各厂氮磷去除潜力。结果表明:(1)各污水厂在氮磷去除方面的潜力值分别如下,出水TP为0. 30 mg/L,出水NH3-N为1. 00mg/L,出水TN为8. 00 mg/L,但难度偏大;(2)进水BOD5/TN普遍不足,影响生物脱氮;(3)缺氧池中有反硝化除磷作用,磷酸盐去除率最低76%,最高84%;(4)污泥浓度MLSS多数稳定在3 000～4 000 mg/L,ORP在厌氧池约-400 m V、缺氧池约-100m V,在污水厂达到满负荷、水量稳定前提下,精细化管理到位,充分发挥前置预缺氧的反硝化和缺氧池的反硝化除磷潜能,对提高脱氮除磷的效率起到推动作用。

To provide technical support for the upgrading of nmnicipal wastewater treatment plants （WWTPs）, the potentials of nitrogen and phosphorus removal for 12 WWTPs in Taihu River Basin were evaluated by analysing their effluent data. The results showed that, （ 1 ） the potential values of nitrogen and phosphorus removal in each WWTPs were as follows ： the mininmnl values of effluent TP, NH3-N and TN were 0. 30, 1 mg/L and 8 mg/L, respectively, but 8 mg/L of TN was difficult in maintaining. （2） The influent BOD5/ TN was generally insufficient, which affected biological nitrogen removal. （3） The appearance of denitrifying phosphorus removal are existed in anoxie tank, and the mininmnl removal rate of phosphate was 76% with the maxinmnl of 84%. （4） The sludge concentrations MLSS were mostly stable at 3 000-4 000 mg/L, while ORP value was about -400 mV in anaerobic tank and -100 mV in anoxie tank. Under the condition of full load and stable ilffluent wastewater quantity- with fine management, potential roles of denitrifieation and phosphorus removal in pre-anoxie and anoxie tanks were benefit to removal efficiency of nitrogen and phosphorus.