Because coke sewage contains lots of hard-biodegraded and toxicant substances, it is considered one of the industrial waste water which is difficult to purify.
焦化废水由于含有大量的难生物降解与有毒物质，因而成为公认难处理工业废水之一。
Because coke sewage contains lots of hard-biodegraded and toxicant substances, It is considered to be one of the most difficult industrial wastewater to purify.
由于焦化废水中含有大量的难生物降解以及一些有毒还对微生物有害的物质，而且其可生化性差，因而焦化废水成为公认难处理工业废水之一。
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