Abstract
AbstractAn 80 m3 pilot‐scale gas–liquid–solid three‐phase flow airlift loop bioreactor (ALR) with a low ratio of height to diameter, in which a biological membrane replaced the activated sludge, was used in the nitrifying treatment of a real effluent from a fertilizer plant. The influences of pH value, air influx (Qg) and hydraulic residence time (HRT) on the reductions in chemical oxygen demand (COD) and ammonia nitrogen (NH4‐N) were investigated and are discussed herein. The optimum operating conditions were obtained at a pH value of 7.0–8.0, air influx of 500 m3 h−1 and an HRT of 10 h. Under these optimum conditions, the effluent COD and NH4‐N were less than 50 mg L−1 and 10 mg L−1 for a 40‐day run, which were far below the primary discharge standard for the chemical fertilizer industry in the People's Republic of China (COD ≤ 100 mg L−1 and NH4‐N ≤ 40 mg L−1). Furthermore, this pilot‐scale airlift loop bioreactor generated only one‐quarter of the sludge waste compared with the traditional activated sludge process. Copyright © 2006 Society of Chemical Industry
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