Separation of rainwater and wastewater issues
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Hello everyone, I’m new here. I’m facing a tricky problem right now and would like to ask for your advice. If a chemical plant shuts down for over 40 days, and then heavy rains wash water from the mountains near the plant as well as from the main roads leading to the plant into the plant’s rainwater drainage system, the plant has measures in place to collect water 15 minutes before rain starts. However, due to the intensity of the rain, the water discharged is very turbid. Tests have shown that the chemical oxygen demand level is slightly above the allowed limit. I would like to know what criteria the environmental protection authorities will use to impose fines in such cases. Are there any regulations regarding the discharge of rainwater? Thank you all!
Rainwater discharge methods include direct discharge, infiltration, pipeline collection and discharge, and clarified discharge. The initial rainwater entering the municipal sewer network must meet the requirements of the \"Quality Standards for Wastewater Discharged into Urban Sewers\" CJ343-2010. The discharge to the plant’s wastewater treatment station is determined according to the requirements of the treatment process. The standards for rainwater discharge are based on the first-level standards for Category 2 pollutants in Phase 2 as specified in the \"DB4426-2001 Water Pollution Discharge Standards\".
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This can only be considered industrial wastewater; penalties are still imposed if the levels of rainwater exceed the limits. If the heavy metal content in rainwater exceeds the allowed level by three times, it constitutes a criminal offense. In recent years, there have been many cases in Zhejiang where companies were caught discharging industrial rainwater containing excessive levels of heavy metals