"Zero discharge" of industrial wastewater does not mean "no discharge at all" in the absolute sense, but refers to the environmental protection goal of removing pollutants in industrial wastewater to the greatest extent through technical means such as source reduction, process control, terminal deep treatment and resource recovery, recycling water resources, and finally disposing only in the form of solid waste (such as crystalline salt and sludge) and not discharging liquid wastewater into the environment. It is an advanced stage for industrial enterprises to achieve efficient utilization of water resources and pollution reduction, especially suitable for water-scarce areas or highly polluting industries (such as coal chemical industry, electric power, electronics, metallurgy, etc.).
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