Rapid acclimation of methanogenic granular sludge into denitrifying sulfide removal granules |
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Authors: | Zhou Xu Chen Chuan Wang Aijie Liu Li-Hong Ho Kuo-Ling Ren Nanqi Lee Duu-Jong |
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Institution: | a State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China b Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan |
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Abstract: | Rapid formation of denitrifying sulfide removal granules is of practical interest to start up an expanded granular sludge bed reactor for wastewater treatment. This study demonstrates that methanogenic granules can be easily acclimated into DSR granules in one day, removing all 1.30 kg m−3 d−1 sulfide and converting >90% of 0.56 kg-N m−3d−1 nitrate into di-nitrogen gas. Under high loadings, reactor performance, however, declined. Under high loading rates, sulfide first inhibited the heterotrophic denitrifier (Caldithrix sp.), thereby accumulating nitrite in the system; the autotrophic denitrifier (Pseudomonas sp. C23) was then inhibited by accumulated nitrite, leading to breakdown of the entire DSR process. |
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Keywords: | Denitrifying sulfide removal Methanogenic granules Pseudomonas sp C23 |
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