Keywords: BCOF, biochemical contact oxidation film, wastewater reuse, nitrification, denitrification, COD removal, complex chemical wastewater, chemical oxygen demand, wastewater treatment, secondary effluent, washwater, sludge dewatering, nitrogen removal
Nitrogen removal in tertiary wastewater treatment plant of a chemical complex
A Biochemical Contact Oxidation Film (BCOF) technique was piloted for the treatment of a secondary effluent of the Jilin Chemical Industry Corporation (JCIC). The original pulse contact flocculation clarifier used for the tertiary treatment was not performing to the discharge standards. Results show that NH3-N concentration was decreased from 30 mg/L to 15 mg/L, COD concentration was decreased from 133 mg/L to 100 mg/L. The treated effluent from the new process can be reused as washwater for the sludge dewatering belt presses. It is estimated that 876 thousand tons of clean water and 2,156,000 RMB can be saved per year.