Degradation of guar in an up-flow anaerobic sludge blanket reactor: Impacts of salinity on performance robustness, granulation and microbial community
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China Univ Petr, State Key Lab Heavy Oil Proc, State Key Lab Petr Pollut Control, Beijing 102249, Peoples R China;China Univ Petr, State Key Lab Heavy Oil Proc, State Key Lab Petr Pollut Control, Beijing 102249, Peoples R China;Univ Hawaii Manoa, Hawaii Nat Energy Inst, Honolulu, HI 96822 USA;Univ Hawaii Manoa, Dept Mol Biosci & Bioengn, Honolulu, HI 96822 USA;China Univ Petr, State Key Lab Heavy Oil Proc, State Key Lab Petr Pollut Control, Beijing 102249, Peoples R China;China Univ Petr, State Key Lab Heavy Oil Proc, State Key Lab Petr Pollut Control, Beijing 102249, Peoples R China;
Guar is extensively used during shale gas exploitation and is a major component in the flowback water. The viscosity of guar has adverse effects for the treatment of flowback water. This study investigated the degradation of guar at different salinities with an up-flow anaerobic sludge blanket (UASB) reactor. The effects of salinity on guar degradation, granular characteristics and microbial community were also studied. Results showed that more than 79% of guar was removed at hydraulic retention time (HRT) of 10 h, even at a concentration of 10000 mg L-1 of NaCl. Increasing salinity decreased granular size and hydrophobicity, but improved the secretion of EPS (especially for protein). Low salt condition 2500 mg L-1 presented faster degradation rate of guar. Salinity resulted in insignificant difference on bacterial community, but decreased the abundance of methanogens. Bacteroides, Prolixibacter and Pelolinea are essential genera in guar degradation. The results demonstrated the potential of UASB in the treatment of flowback water. (C) 2019 Elsevier Ltd. All rights reserved.
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