REGENERATE DOMESTIC WASTEWATER TO CITY GREEN LAND

采用生活污水为水源,经过混凝、过滤强化一级处理制得再生水,浇灌模拟城市绿化草地。经过近6个月的试验,结果表明:草地对混凝过滤处理后的再生水中的污染物有很强的处理能力,对COD、氨氮和无机磷的平均去除率分别达到69.2%、99%、87.5%。同样土壤层厚度条件下,污水浇灌和自来水浇灌的草地出水的硝酸盐含量相当,符合淋洗规律,并没有受浇灌水中氮素的影响。生活污水中含有的少量营养元素(如氮、磷)促进植物的生长。因此采用此方法制得的水浇灌绿地是可行的。Irrigate lawn with domestic wastewater was treated by the way of coagulation-filtration. The result of experiment for nearly six months showed that: the lawn has the strong ability to remove the pollutant in sewage. Its COD, ammonia nitrogen and inorganic phosphorus removing rate achieves 69.2%, 97%, 87.5% in average. The concentration of nitrate in extravasate increases with the thickness of soil increasing. There was not evident difference between lawn extravasate irrigated with tap water and treated domestic wastewater under the condition of same soil thickness. Nitrate in treated domestic wastewater has little influence on the concentration of nitrate of extravasate. Some nutrition like N、P contained in sewage promote the growth of lawn. Therefore, it is feasible to irrigate lawn with domestic wastewater treated by this way