Abstract
Aerobic granulation is a novel biotechnique for the treatment of coloured wastewater containing toxic xenobiotics in sequencing batch reactor (SBR). The aerobic granules were investigated as a potential biomaterial for biodegradation of p-nitrophenol. The removal efficiency of p-nitrophenol was 93 % after 65 days of operation at 8 hr hydraulic retention time (HRT). The aerobic granules were cultivated at a p-nitrophenol loading rate of 0.9 kg m-3 day-1, with sodium acetate as co-substrate to accelerate the growth of p-nitrophenol degrading biomass. SBR was inoculated with activated sludge that was initially conditioned as a batch culture for a period of 30 days by supplying p-nitrophenol. Optimal pH of 9 was maintained throughout the experimental setup. This study clearly demonstrates that aerobic granules are efficient to degrade up to 300 mgL-1 of p-nitrophenol to tolerate the toxicity in high-strength wastewater.
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