Abstract
Performance and microbial community composition were evaluated in a two-phase anaerobic and aerobic system treating sulfate-rich cellulosic ethanol wastewater (CEW). The system was operated at five different chemical oxygen demand (COD)/SO4 2− ratios (63.8, 26.3, 17.8, 13.7, and 10.7). Stable performance was obtained for total COD removal efficiency (94.5%), sulfate removal (89.3%), and methane production rate (11.5 L/day) at an organic loading rate of 32.4 kg COD/(m3·day). The acidogenic reactor made a positive contribution to net VFAs production (2318.1 mg/L) and sulfate removal (60.9%). Acidogenic bacteria (Megasphaera, Parabacteroides, unclassified Ruminococcaceae spp., and Prevotella) and sulfate-reducing bacteria (Butyrivibrio, Megasphaera) were rich in the acidogenic reactor. In the methanogenic reactor, high diversity of microorganisms corresponded with a COD removal contribution of 83.2%. Moreover, methanogens (Methanosaeta) were predominant, suggesting that these organisms played an important role in the acetotrophic methanogenesis pathway. The dominant aerobic bacteria (Truepera) appeared to have been responsible for the COD removal of the SBR. These results indicate that dividing the sulfate reduction process could effectively minimize sulfide toxicity, which is important for the successful operation of system treating sulfate-rich CEW.
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Acknowledgements
This research was supported by the National Key Research and Development Program of China (2016YFC0401101) and the National Natural Science Foundation of China (51308150, 41405130). The research also got the support from the National Science Technology Pillar Program, China (2015BAD15B0502) and the Heilongjiang Postdoctoral Fund (LBH-Z12132) in China. The authors also acknowledge the support from the State Key Laboratory of Urban Water Resource and Environment (2015DX08), and support from the Fundamental Research Funds for the Central Universities (grant no. HIT.MKSTISP.2016 14).
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Shan, L., Zhang, Z., Yu, Y. et al. Performance of CSTR–EGSB–SBR system for treating sulfate-rich cellulosic ethanol wastewater and microbial community analysis. Environ Sci Pollut Res 24, 14387–14395 (2017). https://doi.org/10.1007/s11356-017-9022-5
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DOI: https://doi.org/10.1007/s11356-017-9022-5