干旱地区城市污水回用对地下水和地表水的影响

本文针对城市污水处理厂尾水回用对地下水、地表水的影响进行了分析研究。结果为 :在污染物CODcr、BOD5、SS、NH3-N和TPpo4排放量大量削减的情况下 ,在洪积扇的前缘 ,第四纪堆积物有很厚的亚粘土层和粘土层 ,渗透性能很弱 ,污染物很难渗入到下部含水层 ,尾水回用对地下水无影响 ;当尾水部分回用部分外排时会对地表水造成影响。若将非农灌期剩余尾水 1 849万m3/a通过架空渠穿越山丹河后 ,再修渠引入红沙窝农灌或林灌 ,不但解决了对山丹河水水质的影响 ,而且可扩大灌溉面积 8.0万亩。

Influence of Sewage Recycle on Ground Water and Under Ground Water of City in Arid Region

Ihis research is to study the influence of sewage recycle on under ground water and ground water of city in arid region.The results show that when pollutions of COD crBOD 5SSNH 3-N and TP po4is decreasing largely,at the frontal of diluvial fan there are very thick sub-clay pan and clay pan formed in the fourth century which has poor penetrability,so it is difficult for sewage to permeate and reach containing level,sewage reuse has no influence on under ground water,but the draining out of sewage will influence ground water.If 184900 thousand m3/a of residual sewage was drain to Shandan river during non-farming irrigation period,then into red sand for farming irrigation or woods irrigation,it will advantage to Shandan river water quality,and also to enlarging irrigation area of 32.4 thousand hectare.