城市雨水处理工艺与技术

Technique and technology on rainwater treatment in urban area

城市化的快速发展使不透水地面面积迅速增长,雨水径流量也随之增加,由于降水淋洗大气污染物及其对地表污染物的冲刷,其污染威胁不能再被忽视。雨水径流有明显的初期冲刷作用,污染物集中在初期的数毫米雨量中,因此,控制初期雨水成为雨水利用系统和城市径流污染控制的一项主要举措。初雨弃流装置主要有优先流法弃流池、切换式或小管弃流井、旋流分离式初雨弃流设备、自动翻板式初雨分离器等多种型式。弃除初雨的径流建议采用物化方法进行处理,宜采用筛网格栅、混凝沉淀及过滤等工艺。

The area of impermeable ground increases rapidly with the development of urbanization, and the amount of runoff increase accordingly. As the rainfall washes the pollutants in the air and on the ground, its threat of pollution can not be ignored anymore. Runoff has obvious effect of flushing pollutants and most pollutants centralize on the first flush, so pollution control of the first flush becomes very important. Technology of pollution control of the first flush mainly includes pond of wastewater abandoning firstly, switching well of wastewater abandoning, revolving separator and separator of reversing automatically etc. The runoff except the first flush is suggested to be disposed by physic and chemic measures, including grid, coagulation, sedimentation and filtration etc.