Industry cases - Industrial wastewater treatment and reuse

—— "High toxicity, difficult to degrade, and cannot be directly discharged" high-risk water source

The wastewater in the medical and pharmaceutical industry has the significant characteristics of "many types of pollutants, toxic and difficult to degrade, difficult to treat, and high compliance requirements", and is one of the high-risk wastewater types in environmental protection management:
High toxicity and high difficulty to degrade: The wastewater contains a large number of organic pollutants such as antibiotics, hormones, cytotoxins, solvent residues, API intermediates, etc., which are difficult to effectively degrade by conventional biochemical methods. COD is usually 2,000-10,000mg/L, and BOD₅ is only 20-40% of COD, with poor biodegradability.
Complex and changeable: Water quality and water volume fluctuate violently with frequent changes in product types and processes, the pH range can reach 2-11, the instantaneous pollutant concentration fluctuates by more than 3-5 times, and the shock load is extremely strong.
High nitrogen and high salt: Contains a large amount of ammonia nitrogen (NH₃-N) and salt (Cl⁻, SO₄²⁻), with ammonia nitrogen as high as 200–800 mg/L and conductivity exceeding 10,000 μS/cm, which seriously inhibits microbial activity.
Extremely strict standards: must meet the "Medical Institution Water Pollutant Emission Standard" (GB18466-2005), "Pharmaceutical Industry Water Pollutant Emission Standard" (GB21903-2008) and other regulations, and some projects must also implement local surface water standards or direct reuse requirements, with as many as 20 to 30 control indicators.