◆Process introduction

Dairy wastewater is wastewater discharged from the production process of condensed milk, cheese, cream, dairy soft drinks, ice cream and dairy snacks. Wastewater mainly comes from the cleaning water of containers and equipment, and the main component contains raw materials for products. Among them, milk processing plants contain 0.2% of processed raw milk, BOD 20-300mg/L, and low pollution, while cheese and butter processing wastewater have a high degree of pollution, with COD reaching 3000 mg/L, BOD reaching 2400 mg/L and total nitrogen ( N) up to 90mg/L, total phosphorus (P) up to 16mg/L, oil content up to 200 mg/L, suspended solids up to 600 mg/L, raw materials in wastewater such as butter and condensed milk should be recovered as by-products and in production Reduce its loss in the process.

The discharged sewage is collected by the drainage system, and then enters the grid well of sewage treatment. After removing floating objects and particles, it enters the pre-sedimentation and adjustment tank for the settlement of large sewage particles and the average value of sewage, and then controls the liquid level. The instrument transmits the signal, which is sent from the lifting pump to the Class A biological tank. In anoxic state, the denitrification process uses the sewage organic matter as the carbon source for denitrification, removes nitrate nitrogen and reduces the concentration of organic matter, and then flows into the Class O biological contact oxidation tank for good Oxygen biochemical reaction, where most of the organic pollutants are degraded through biological assimilation, synthesis and dissimilation, and the harmful bacteria in the water are filtered before reuse.