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1. Open loop systems that draw water from a well and drain to the surface may contribute to aquifer depletion, water shortages, groundwater contamination, and subsidence of the soil.
开环系统，吸引流失的水和良好的表面可能会导致含水层耗竭，水资源短缺，地下水污染，土壤下陷的。
2. The utility model can effectively avoid foreign odor and harmful gas emitted by the contamination of the drain.
能有效避免排污管被污染而散发异味和有害气体。
3. Control reconstruction of air purification system drain contamination
空气净化系统排污的控制改造
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4. 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。
5. 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。