染料属生物难降解有机物，染料和印染废水已成为当前最重要的水体污染源之一。
Dyes and their effluent have become one of the main sources of water pollution, and are difficulty to be degraded by organism.
焦化废水组分复杂、生物难降解有机物含量高，是国内外废水处理领域的难题之一。
The coking wastewater has complex component and highly biology difficult to degrade the organic matter.
近年来利用绿色化学过程来处理难生物降解有机物是一个非常活跃的研究课题。
Treatment of non biodegradable toxic organic pollutants by green chemical process is a very active field in recent years.
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