Abstract: A laboratory-scale sequencing batch reactor (SBR) is used to treat landfill leachate containing high concentration of ammonium nitrogen with municipal fecal supernatant. The SBR system is operated in the following sequential phases: fill period, anoxic period, aeration period, settling period, decant and idle period. The results indicated that the average removal efficiencies of COD, BOD₅, TN, NH₄⁺-N were 93.76%, 98.28%, 84.74% and 99.21%, respectively. The average sludge removal loading rates of COD, BOD₅, TN and NH₄⁺-N were 0.24 kg/(kg SS∙d), 0.08 kg/(kg SS∙d), 0.04 kg/(kg SS∙d) and 0.036 kg/(kg SS∙d), respectively. Highly effective simultaneous nitrification and denitrification was achieved in the SBR system. The ratio of nitrification and denitrification was 99% and 84%, respectively. There was partial NO₂⁻ denitrification in the system.

Key words: Sequencing batch reactor (SBR), Leachate, Fecal supernatant, Simultaneous nitrification, Denitrification

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