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.
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