Simultaneous biological removal of sulfur, nitrogen and carbon using EGSB reactor |
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Authors: | Chuan Chen Nanqi Ren Aijie Wang Zhenguo Yu Duu-Jong Lee |
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Affiliation: | (1) School of Municipal & Environmental Engineering, Harbin Institute of Technology, P. O. Box 2614, 202 Haihe Road, Harbin, 150090, China;(2) Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan |
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Abstract: | High-rate biological conversion of sulfide and nitrate in synthetic wastewater to, respectively, elemental sulfur (S0) and nitrogen-containing gas (such as N2) was achieved in an expanded granular sludge bed (EGSB) reactor. A novel strategy was adopted to first cultivate mature granules using anaerobic sludge as seed sludge in sulfate-laden medium. The cultivated granules were then incubated in sulfide-laden medium to acclimate autotrophic denitrifiers. The incubated granules converted sulfide, nitrate, and acetate simultaneously in the same EGSB reactor to S0, N-containing gases and CO2 at loading rates of 3.0 kg S m−3 d−1, 1.45 kg N m−3 d−1, and 2.77 kg Ac m−1 d−1, respectively, and was not inhibited by sulfide concentrations up to 800 mg l−1. Effects of the C/N ratio on granule performance were identified. The granules cultivated in the sulfide-laden medium have Pseudomonas spp. and Azoarcus sp. presenting the heterotrophs and autotrophs that co-work in the high-rate EGSB-SDD (simultaneous desulfurization and denitrification) reactor. |
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Keywords: | Desulfurization Denitrification EGSB Granules |
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