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Sewage zero discharge is generally aimed at the treatment of heavy industrial sewage or domestic sewage. In some areas, environmental protection requirements must be achieved zero discharge, so as not to cause pollution to the surface water.

General industrial waste water zero discharge is divided into the following situations:

1. The wastewater to be treated has good biochemical properties, and the reuse water does not require high water quality, such as papermaking, coal mine yellow mud grouting, coke quenching, etc. The main treatment process is "pretreatment + coagulation and sedimentation + biochemical treatment";

2. The biochemical properties of the wastewater to be treated are good or good, and the reuse water has higher requirements on water quality and ion content, such as: greening, underground fire fighting, process reuse, etc. The main treatment process is "pretreatment + coagulation sedimentation + biochemical treatment + membrane treatment process";

3. The biochemistry of the treated wastewater is poor, and the reuse water requires high water quality and ion content. The main treatment process is "pretreatment + advanced oxidation + membrane treatment process" or "pretreatment + membrane treatment process".