六箱一体化活性污泥工艺对脱氮除磷处理的强化

Enhanced Treatment for Nitrogen and Phosphorus Removal by Six-Tank Integrative Activated Sludge Process(STIASP)

通过调整进水碳氮比(C/N)和进水端厌氧池和缺氧池的进水流量配比,重点考察了六箱一体化活性污泥工艺脱氮除磷效果。结果表明:在试验条件下,C/N的提高可增强脱氮除磷效果,C/N比值为4时,碳源明显不足,出水TN和IP的质量浓度分别为15.52mg/L和1.02mg/L;C/N比值增加至5时,TN出水效果较好,质量浓度为12.87mg/L,而出水TP的质量浓度仍然在0.5~0.6mg/L左右;当C/N比值≥6时,出水氮磷浓度均能达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准。控制C/N比值为5,优化工艺进水碳源分配可以提高碳源利用率,当厌氧池和缺氧池进水流量比为2时,出水TN质量浓度保持在13.5mg/L以下,出水TP质量浓度降低至0.36mg/L,整体出水水质优于GB 18918一2002一级A标准,强化了脱氮除磷效果。

The effect of nitrogen and phosphorus removal of STIASP is investigated by regulating C/N radio in influent and distribution ratio of influent in the anaerobic and anoxic tanks. Results indicate that there is a positive correlation between C/N radio and removal efficiency of nitrogen and phosphorus under experimental conditions. The concentrations of TN and TP in the effluent are 15.52 mg/L and 1.02 mg/L when C/N radio is 4, which carbon source is obviously insufficient. By adding C/N radio to 5 concentrations of TN is decreased to 12.87 mg/L while the concentrations of TP in the effluent is still 0.5-0.6 mg/L. When the C/N radio is higher than 7, the effluent of the system can stably meet the first grade A standards of Urban Sewage Disposal Plant Contamination Integrated Discharge Standard. Utilization efficiency of carbon source can be improved by adjusting C/N radio to 5 and optimizing influent flow rate distribution ratio. The quality of effluent water is better than Standard A of the first class in GB 18918-2002, which the concentration of TN and TP in the effluent are lower than 13.5 mg/L and 0.36 mg/L. Effect of nitrogen and phosphorus removal would be strength when the influent distribution ratio is 2 in anaerobic and anoxic tanks.