• 关键词：活性污泥2号模型  活性污泥法  生物脱氮除磷改造

• 基金项目：重庆市科委“十五”重点科技项目

• 张代钧
• 1. 重庆大学环境科学系,重庆 400044; 2. 重庆大学西南资源开发及环境灾害控制工程教育部重点实验室

• 卢培利
• 重庆大学环境科学系,重庆 400044

• 严晨敏
• 重庆大学环境科学系,重庆 400044

• 龙腾锐
• 重庆大学城市与环境工程学院

• 摘要：利用自行开发的活性污泥2号模型ASMNO.2计算机模拟程序对重庆市某污水厂三种脱氮除磷改造方案(A/O,A₂/O,倒置A₂/O)进行了模拟研究,寻求了每一种方案的最佳运行控制参数.结果表明:(1)将现有曝气池前端14控制为缺氧而形成A/O工艺,缺氧区溶解氧浓度为0.10mgL,混合液内回流比为100%,可以使TN去除率达到58.6%,提高24个百分点,TP基本不受影响;(2)将现有曝气池前端12%控制为厌氧区,24%控制为缺氧区,缺氧区溶解氧浓度为0.10mgL,混合液内回流比为100%,可以使TN去除率达到62.1%,提高约28个百分点,TP去除率达到78.3%,提高37个百分点;(3)倒置A₂/O工艺与常规A₂/O工艺的出水水质基本相当,但倒置A₂/O工艺在工程实践中更易于实现;(4)三种工艺出水COD和氨氮均能达到国家规定的一级排放标准.

• Abstract：The performance of three schemes(A/O,A₂/O,reverse A₂/O) of upgrading for biological nitrogen and phosphorus removal in some WWTP in Chongqing were predicted and the optimum operational parameters of each scheme were sought through the computer simulation program based on IWA ASM No.2. The results showed that: (1) The efficiency of TN removal could be increased from 34.2% to 58.6% by A/O process, if 1/4 of the existing aeration pond was converted to anoxic zone with dissolved oxygen concentration of 0.10 mg/L in the anoxic zone and the inner cycle mixed liquid ratio of 100%. Meanwhile, the TP was hardly influenced. (2) The efficiency of the TN removal could be increased from 34.2% to 62.3% and the TP from 41.7% to 78.3% in A₂/O process, if 12% of the existing aeration pond was converted of anaerobic zone and 24% to anoxic zone, with dissolved oxygen concentration of 0.10 mg/L in the anoxic zone and the inner cycle mixed liquid ratio of 100%. (3)The effect of the reverse A₂/O process was almost same to the A₂/O process, but the former was more feasible in practice. (4)The effluent COD and NH₄⁺-N concentrations could meet the standard.

• Key words：activated sludge model No.2  activated sludge process  upgrading for biological nitrogen and phosphorus removals

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