A large quantity of waste acid is discharged from titanium dioxide production by sulfuric acid method that must be treated for preventing the environment.

硫酸法钛白生产中产生大量高浓度的废硫酸，必须治理，否则将对环境造成巨大污染。

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A great quantity of acid wastewater is discharged from the production process of sulfuric acid, single superphosphate and ammonium phosphate, causing serious pollution of water bodies.

硫酸、普钙和磷铵生产过程中排放大量酸性废水，对水体造成严重污染。

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The large quantity of toxic and harmful sewage with complex components and high density, which is discharged in the course of the coal gas production, is a kind of hard-treated industrial sewage.

在煤气生产过程中排出大量有毒有害污水，其水量大、成分复杂、浓度高，是一种很难处理的工业污水。

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