钻井污水处理中存在着混凝剂效力不高，处理费用较高并易造成二次污染等问题。
There exist many problems such as inefficient coagulant more expensive treatment the secondary pollution in treating drilling waste water.
三叶型罗茨鼓风机具有低噪声的特点，解决了污水处理设备中应用罗茨鼓风机进行曝气带来的二次嗓声污染的难题。
This type blower has been successfully developed to solve the secondary noise pollution, the difficult problem caused by Roots blowers which are used for the aeration of wastewater.
吸泥机是给水工程中平流式沉淀池和污水处理工程中，二次平流式沉淀池等专用排泥设备。
Suction Dredger: it is special mud disposal equipment designed for flat flow sedimentary pond, sewage disposal project, and secondary flat flow sedimentary pond.
本研究对城市生活污水处理厂二次处理水，采用周期逆洗型静态过滤方式进行了精密膜过滤。
The secondary treating water from urban domestic sewage treatment plant was treated by fine membrane with the way of periodic counter-flow static type.
污泥是污水处理厂污水处理过程中的二次产物，如何有效处置污泥及对其进行合理利用，已成为当今环境工程界最为关注的课题之一。
Sludge is a by-product in the course of sewage treatment. Nowadays, how to treat and use sludge effectively and economically has become one of the most concerned subjects in environment engineering.
来自污水处理厂的污泥产量大，成分复杂，含有多种病菌，处置不当势必造成二次污染。
Sewage treatment plants yield lots of sewage sludge. The sludge has complex composition, containing a variety of bacteria, and then the improper disposal is bound to cause secondary pollution.
来自污水处理厂的污泥产量大，成分复杂，含有多种病菌，处置不当势必造成二次污染。
Sewage treatment plants yield lots of sewage sludge. The sludge has complex composition, containing a variety of bacteria, and then the improper disposal is bound to cause secondary pollution.
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