期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 24, 期 16, 页码 14387-14395出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-017-9022-5
关键词
Cellulosic ethanol wastewater; Sulfate; Two-phase anaerobic digestion; Aerobic treatment; High-throughput sequencing
资金
- National Key Research and Development Program of China [2016YFC0401101]
- National Natural Science Foundation of China [51308150, 41405130]
- National Science Technology Pillar Program, China [2015BAD15B0502]
- Heilongjiang Postdoctoral Fund in China [LBH-Z12132]
- State Key Laboratory of Urban Water Resource and Environment [2015DX08]
- Fundamental Research Funds for the Central Universities [HIT.MKSTISP.2016 14]
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)/SO42- 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/(m(3).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 sulfatereducing 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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