Overview
Zhejiang wastewater treatment plant serves Yiwu City, Zhejiang Province, China, with a population equivalent of 125,000. It operates under China's national wastewater discharge standards.
The Zhejiang wastewater treatment plant is located in Yiwu City, part of Jinhua Prefecture in Zhejiang Province, China. It serves a population of approximately 125,000 people, classifying it as a medium-to-large agglomeration under Chinese municipal wastewater management. The plant is situated in the inland region of eastern China, away from the coast. As a facility serving over 100,000 people, the plant is expected to meet China's Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), which mandates secondary treatment with nutrient removal for sensitive water bodies. Typical plants of this scale in Zhejiang employ activated sludge processes with biological nitrogen and phosphorus removal. The plant discharges treated effluent into local waterways that ultimately drain into the East China Sea via the Qiantang River system. The receiving water bodies support diverse aquatic life and are important for regional water resources. The plant plays a key role in protecting downstream water quality and public health in the densely populated Yangtze River Delta region.
Environmental context
The plant's treated effluent flows into local rivers within the Qiantang River basin, which drains into Hangzhou Bay and the East China Sea. This watershed supports important fisheries and provides water for agricultural and industrial use downstream. The region experiences a subtropical monsoon climate with heavy rainfall, making effective wastewater treatment crucial to prevent eutrophication and protect aquatic ecosystems in the coastal zone.
Frequently asked questions
The plant is located in Yiwu City, Jinhua Prefecture, Zhejiang Province, China, at latitude 29.339000 and longitude 120.035000.
The plant serves approximately 125,000 people, classifying it as a medium-to-large municipal wastewater treatment facility.
The plant discharges treated effluent into local waterways that are part of the Qiantang River basin, which ultimately flows into Hangzhou Bay and the East China Sea.
The plant operates under China's national standard GB 18918-2002, which sets discharge limits for pollutants including COD, BOD, ammonia, and phosphorus. For plants serving over 100,000 people, secondary treatment with nutrient removal is typically required.
For a plant of this scale in China, typical treatment includes primary sedimentation followed by activated sludge biological treatment with nitrogen and phosphorus removal, often using processes like A2O or oxidation ditch, and disinfection before discharge.
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