好氧颗粒污泥处理城市污水的农田适灌性

利用好氧颗粒污泥处理城市污水,探讨城市污水用于农田灌溉的可行性.研究表明:经过好氧颗粒污泥处理过的污水,污水中的化学需氧量为130 mg/L,悬浮物为50 mg/L,总氮20 mg/L,总磷只有1.5 mg/L,出水中的COD_Cr和BOD₅去除率达到60%和55%;好氧颗粒污泥对污水中的氮、磷去除效果一般,去除率分别为50%和53%;出水中重金属去除率比较高,镉质量=浓度1.0×10^-5 mg/L,小于《农田灌溉水质标准》镉的标准值0.006 mg/L,出水中铅质量=浓度0.02 mg/L,小于标准值0.1 mg/L,出水中锌、铜、汞、铬的质量=浓度也远远低于标准中的质量=浓度值.结果表明,好氧颗粒污泥处理过的城市污水的出水可以用于农田灌溉,出水中COD_Cr和BOD₅、氮、磷、重金属等指标完全达到《农田灌溉水质标准》要求.

Farmland irrigation of city sewage treated by aerobic granular sludge

The irrigation possibility of city sewage treated by aerobic granular sludge was explored. Results show that after the sewage was treated by aerobic granular sludge, the removal rates of COD_cr and BOD₅ in its effluents were 60% and 55% respectively; the removal rates of nitrogen and phosphorus were 50% and 53% separately;the removal rate of heavy metal was very high. The content of cadmium in the effluents was less than 1.0?10^-5 mg/L. The Farmland Irrigation Water Quality Standard, whose value is less than 0.006 mg/L. Pb content in the effluents is 0.02 mg/L, less than the standard value of 0.1 mg/L. And the contents of other heavy metals, such as zinc, copper, mercury, chromium in the effluents were also much lower than the content values in the standard. So, the effluents of city sewage treated by aerobic granular sludge could be applied to farmland irrigation, and the indexes of COD_Cr,BOD₅ nitregen,phosphorus,and other heavy metals in the effluents fully meet the requirements of the standard of the Farmland Irrigation Water Quality.