Coking waste water, which is hardly degradable due to high organic content, is difficult to treat and its water quality varies with the raw coal composition and coking method.

• 焦化废水是一种氨氮和有机物浓度较高的难降解有机废水,且其水质随原煤组成和炼焦工艺的不同而变化,较难处理。