东京协议对其成员在排放物净化的计划、测量、监测等方面有严格规定。它允许富裕国家从贫穷国家购买排放权以达到净化标准。但是对于志愿净化行为，目前还没有统一的执行标准。
The Kyoto protocol includes strict rules on the design, measurement and monitoring of the offsets it permits rich countries to buy from poor ones to meet their targeted cuts in emissions.
城市污泥是城市污水处理厂经各级处理净化污水而产生的沉积物，主要来自初沉池和剩余污泥的排放。
Sewage sludge which mainly comes from the primary settling tank and discharge of surplus sludge is the deposit produced in each operating unit in municipal wastewater treatment plant.
本文从数学方面论证了微型生物在污染的环境中起净化作用的前提是：必须对污染物的排放量加以限制；
This paper has proved mathematically that the prerequisite for mini-orhan- isms to be able to purify polluted environment is that the amount of pollutant should he limited.
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