A^2O-MBR工艺处理城市污水作农业灌溉用水中试研究

Treatment of urban wastewater for agricultural irrigation by A^2O-MBR

为开发一种污水再生利用于农田灌溉领域的新型技术,本实验以城市污水为研究对象,采用A2O-MBR工艺进行中试研究,并将系统出水水质与《农田灌溉水质标准(GB5084-2005)》的主要水质指标进行对比分析。结果表明,系统COD和BOD5出水浓度范围分别为3.2~59.6 mg/L、1.0~7.6 mg/L,系统出水pH为7.16~7.54,悬浮物浓度几乎为0,上述指标均符合标准;TP、TN和氨氮的出水范围分别为0.03~0.79 mg/L、1.6~17.7 mg/L和0.8~10.3 mg/L。《农田灌溉水质标准》没有对上述3个指标提出具体要求,且少量的氮磷是植物生长的营养元素。该系统出水的主要水质指标符合标准要求。

Abstract To develop a kind of new technology on wastewater reuse in irrigation areas, we used A20 - membrane bioreaetor to conduct pilot study, and also did comparative analysis between the effluent water quality of membrane process and Water Quality Standard for Agricultural Irrigation （GB5084-2005）. The result indicated that the effluent concentration ranges of COD, BOD5 of the system were 3.2 - 59.6 nag/L, 1.0 - 7.6 rag/L, re- spectively, the effluent pH was 7.16 -7.54, and the effluent of SS was hardly 0, above index all followed the standard. The effluent concentration ranges of TP, TN, NH3-N were 0.03 -0. 79 mg/L, 1.6 - 17.7 mg/L and 0.8 - 10.3 mg/L, respectively. There is no limit on them in the standard, and small amounts of nitrogen and phosphorus are nutrient elements for plant growth . The main water quality objectives of the effluent in the system conform to the standard.