Coal distillation processes, such as coal gasification and coal coking produce complex wastewaters. the coking process involves the destructive distillation of coal in an anoxic environment. The volatile componds released during the coking process are either condensed or scrubbed out in the gas main or primary coolers.Tar is decanted from the condensate and the remaining aqueous waste, known as the flushing liquor or weak ammonia liquor (WAL), is the major source of coking plant wastewater.
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