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Untreated wastewater (containing high concentrations of COD, heavy metals, toxic and harmful substances) discharged directly can lead to eutrophication of surface water, groundwater pollution, disrupt ecological balance of rivers, lakes and seas, and threaten safety of drinking water sources. Pathogenic microorganisms, heavy metals, and persistent organic pollutants in wastewater can pose threat to human health and cause diseases through infiltration into drinking water, food chains, or soil. The Environmental Protection Law, Water Pollution Prevention and Control Law, and various discharge standards (such as GB 18918-2002) clearly stipulate that sewage and wastewater must be discharged in compliance with standards. Untreated or excessive discharge will face severe penalties such as fines and production shutdowns for rectification.
Core Objectives for Wastewater Treatment
1. Remove major pollutants from wastewater, including COD, BOD₅, SS, ammonia nitrogen, total phosphorus, heavy metals (if applicable), chromaticity, etc.
2. The effluent quality meets the preset requirements: Meet the standards and discharge into surface water / municipal pipelines, or recycled water standards used for greening, cooling, flushing, etc.
3. Reduce processing energy and drug consumption, decrease sludge production, and balance economy and environmental protection.
