Preventing such pollution will require waste water companies to have a responsibility for sludge quality and powers to know about and control toxic discharges to the sewers that run to their works.
为了预防类似土壤污染的发生，废水处理公司在进行工作时必须负起责任，了解污泥的质量所将带来的影响和管制废水中有毒物质的排放。
The results indicated that, along with application of normal fertilizers, application of sludge organic fertilizer could significantly increase potato yield, commercial class and quality.
结果表明，在施化肥的基础上，施用污泥有机肥可显著提高马铃薯产量、等级和品质；
The key reasons of lowing of cleaned ratio coal were bad coal quality and large increase in sludge.
经分析发现，煤质变差，煤泥量大幅度增加是影响精煤产率的关键。
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