摘要
为了解冬季低温对河北省污水处理厂的总氮去除效果的影响,对河北省沿海三市污水处理厂的除氮工艺和措施进行了调查统计,并对污水处理厂实际出水中总氮浓度进行了季节变化分析.结果表明:冬季河北省沿海三市中秦皇岛市污水处理厂除氮效率较其他季节有明显下降,各季节实际出水的总氮浓度均值分别为8.44 mg/L(冬季)、7.55 mg/L(春季)、5.94 mg/L(夏季)、7.33 mg/L(秋季),唐山市(各季节实际出水的总氮浓度均值分别为冬季7.76 mg/L、春季7.21 mg/L、夏季7.64 mg/L、秋季7.31 mg/L)、沧州市(各季节实际出的总氮浓度均值分别为水冬季7.04 mg/L、春季6.82 mg/L、夏季6.90 mg/L、秋季7.11 mg/L)污水处理厂除氮效率受季节温度变化影响较小;污水处理厂一般采用保温或工艺优化调整来尽量降低低温对活性污泥系统的影响,基本保证出水水质达到《城镇污水处理厂污染物排放标准》(GB18918-2002)中一级A的排放标准要求.
Abstract
In order to understand the effect of low temperature in winter on the total nitrogen removal efficiency of wastewater treatment plants in Hebei Province,the nitrogen removal process and measures of wastewater treatment plants in three coastal cities of Hebei Province were investigated and analyzed.The results showed the nitrogen removal efficiency of wastewater treatment plants in Qinhuangdao City,three coastal cities of Hebei Province,de-creased significantly in winter compared with other seasons.The average nitrogen concentration of the effluent in each season was 8.44 mg/L(winter),7.55 mg/L(spring),5.94 mg/L(summer)and 7.33 mg/L(autumn),respectively.Tangshan City(the actual mean total nitrogen concentration in each season was 7.76 mg/L in winter,7.21 mg/L in spring,7.64 mg/L in summer and 7.31 mg/L in autumn),and Cangzhou City(the actual mean total nitrogen con-centration in each season was 7.04 mg/L in winter and 6.82 in spring)mg/L,6.90 mg/L in summer,7.11 mg/L in autumn)nitrogen removal efficiency of wastewater treatment plants was little affected by seasonal temperature changes.Sewage treatment plants generally adopt thermal insulation or process optimization adjustment to mini-mize the impact of low temperature on the activated sludge system,and basically ensure that the effluent quality meets the discharge standard requirements of Grade A in the Pollutant Discharge Standard for Urban Sewage Treatment Plants(GB18918-2002).
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