The rapid development of the urban economy is inseparable from the support of various heavy industries. Although heavy industry can provide many economic benefits in the process of development, it will inevitably produce a lot of pollution. Water is essential in the process of industrial production. In addition to the waste gas that is discharged into the atmosphere, a lot of wastewater will also be discharged in industrial production (Iurchenko et al., 2016). Heavy industrial production is also related to metals; therefore, there are a lot of heavy metals in wastewater. If left untreated, the wastewater will inevitably...
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