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The combined effect of benzalkonium chloride (BAC) and prolonged exposure to low temperature on nitrification was investigated. Ammonia oxidation at 22–24°C by an enriched nitrifying culture was inhibited at increasing BAC concentrations and ceased at 15mg BAC/L. The non-competitive inhibition coefficient was 1.5±0.9mg BAC/L. Nitrification tests were conducted without and with BAC at 5mg/L using an...
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