drain contamination

Study on Environmental Pollution Control and Licence for Drain Contamination Trade

浅论环境污染控制与排污许可证交易

Control reconstruction of air purification system drain contamination

空气净化系统排污的控制改造

This paper introduced in brief on the principle of air purification and existing problems of drain contamination system , and this paper explained the effects and energy saving of automatic drain contamination system .

本文简要介绍了华北铝业有限公司空气净化系统的原理及排污系统存在的问题，叙述了自动排污控制系统的使用效果和节能情况。

Corporations that drain contamination into Huai River drainage area tributaries must implement a treatment deadline , and by the end of 1997 , at the latest , stop draining contamination into tributaries .

对所有向淮河流域河流排污的企业，要进行限期治理，最迟于一九九七年底停止向河流排污。