取代允许这种气体自由挥发并污染空气的是，一些废物处理公司采用收集净化系统，使得他们可以把这种气体(LFG)转化成能量。
Instead of letting this gas escape and pollute the air, some waste management companies are employing a capture and purification system that allows them to convert the landfill gas (LFG) into energy.
根据锅炉除尘废水循环回用的水质要求，提出将循环水净化与锅炉烟气脱硫除尘联合进行以及应因地制宜，利用各种废物处理锅炉废水和废气。
According to the quality requirement for the recycle water a treatment scheme combining the purification of circulating wastewater and the desulfurization process of stack gas treatment is proposed.
随着大量污水、废物源源不断地排放入海，红树林湿地的水体净化功能正日益受到重视。
With a great deal of sewage and garbage being increasingly drained into the sea, great attentions have been paid to the effect of mangrove wetland system on water purification.
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