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Dairy wastewater is the wastewater discharged from the production of condensed milk, cheese, cream, milk beverage, ice cream and dairy snacks. The waste water mainly comes from the cleaning water of containers and equipment, and the main component contains raw materials of products.Dairy wastewater has high chroma, COD and BOD content in 2000-3000ppm. The raw water has strong biodegradability and is suitable for biochemical treatment. The conventional process of dairy wastewater is "grid + hydrolysis acidification + contact oxidation + coagulation sedimentation / air flotation". The treated wastewater can meet the comprehensive wastewater discharge standard or industry discharge standard.