Industry cases - Industrial wastewater treatment and reuse

—— Challenges of “high concentration, high volatility, and high load”

Food processing wastewater is typically characterized by “high organic load, high fat content, fine solids, concentrated nutrients, and strong volatility”:
High organic load: COD is often 1,000–8,000 mg/L, BOD₅ is 500–3,000 mg/L, and ordinary biochemical pools are prone to shock loads.
High fat and oil content: Oil (FOG) can reach 100–300 mg/L, which is easy to scale and clog in pipe networks and equipment.
Small suspended solids: SS is generally 200–800 mg/L, mostly protein, starch, and fiber residues, and the removal efficiency of traditional sedimentation tanks is limited.
Rich in nitrogen and phosphorus nutrients: Ammonia nitrogen can reach 50–200 mg/L, and total phosphorus is 10–30 mg/L, providing a “natural habitat” for eutrophication at the back end.
Water volume fluctuates significantly: With different production batches, washing and cleaning cycles, daily water consumption often fluctuates by 30%-60%, and water consumption per ton of product is about 10-50m³.