两级A/O工艺处理生活污水脱氮除磷试验

Nitrogen and phosphorus removal from domestic sewage by two-stage A/O process

针对传统A2/O工艺存在的泥龄矛盾,将脱氮和除磷分置于前后2套不同的A/O系统中,第一级A/O采用活性污泥法除磷;第二级A/O采用生物膜法脱氮。以生活污水为处理对象进行试验研究。结果表明,在泥龄为6 d、水温为22～28℃,进水NH3-N、TP、COD的质量浓度分别为40～70、2.0～6.0、150～320 mg/L条件下,出水NH3-N、TP、COD的平均质量浓度分别为5.9、1.0、40 mg/L,均达到了城镇污水处理厂污染物排放标准(GB18918-2002)中的一级排放标准,其去除率分别为82.5%、69.7%、83.1%。

To solve the SRT contradiction existed in the traditional A^2/U process, tecnnologies for nitrogen removal and phosphorus removal were used separately in two different A/O systems, Phosphorus was removed in the first A/O process with activated sludge technology, and then, nitrogen was removed in the second A/O process with biological film technology. A study＂ was carried out with domestic sewage as treatment object, the results showed that, under the condition that, the SRT was 6 d, the temperature was 22 - 28℃ the mass concentration of NH3-N, TP, COD in influent water were 40 - 70, 2.0 - 6.0, 150 - 320 mg/L respectively, the mass concentration of NH3-N, TP, COD in effluent water were 5.9, 1.0, 40 mg/L in average respectively, which met the specification for grade 1 in Discharge standard of pollutants for municipal wastewate r treatment plant （ GB 18918-2002）, the removal rate of the above three pollutants were 82.5%, 69.7%, 83.1% respectively.