作　　者： (王惠）; (王芳）; (白海霞）;

机构地区： 兰州兴蓉环境发展有限责任公司,甘肃兰州730070

出　　处： 《中国给水排水》 2017年第16期114-116,共3页

摘　　要： 西北某城市污水处理厂提标改造工程,在不新建反应池、不改变主体结构的前提下,在好氧池中改造出第二缺氧区,拆除好氧池中微孔曝气管,改为微孔曝气盘,提高了好氧池的曝气充氧效率。好氧池中污泥浓度控制在6 000 mg/L,污泥外回流比为200%左右,内回流为100%左右,运行稳定,出水COD、氨氮、TN和TP等指标由《污水综合排放标准》(GB 8978—1996)的一级标准提升到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级B标准。 In northwestern China, a municipal wastewater treatment plant was renovated and updated under the prerequisite of no more reactor construction and no modification of main structures. In the modification process, a part of the aerobic tank was converted to the second anoxic zone. To improve the aeration performance in aerobic tank, the microporous aeration pipe were replaced by the microporous aeration plate. Sludge concentration in aerobic tank was controlled at around 6 000 mg/L, the external and internal reflux ratios were respectively 200% and 100%. The performance of the treatment process was steadily, and the concentrations of COD, NH3 - N, TN and TP in the effluent were improved from the first level criteria of Integrated Wastewater Discharge Standard （GB 8978 -1996） to the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918 - 2002）.

关 键 词： 污水处理厂 提标改造 一级 标准