X. Zhen, Miao Luo, Haiying Dong, L. Fang, Weiwei Wang, Lei Feng, Qin Yu
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引用次数: 4
摘要
在太阳能辅助加热厌氧消化反应器上进行了餐厨废弃物的半连续消化实验。研究了有机负荷调节(OLR为2.0、4.0、6.0和7.0 kg m−3 d−1 VS(挥发性固体))对甲烷产量、物理化学参数和微生物群落结构的影响。结果表明,6.0 kg m−3 d−1 VS可达到餐厨垃圾厌氧消化极限OLR的最佳甲烷产量。在此阶段,有机酸在反应器中的积累导致pH值的大幅波动。人工碱调节可以恢复反应器的稳定运行,但反应器无法承受7.0 kg m−3 d−1 VS的OLR冲击。此外,高通测序结果表明,在低OLR条件下,微生物表现出较高的功能浓度和较差的群落丰富度,增加OLR可以促进微生物丰富度。同时,乙酸产甲烷菌的甲烷菌在低OLR阶段相对丰富,而氢营养产甲烷菌Methanogula和Methanospirillum在高OLR阶段表现出较高的活性,但当OLR过高时,产酸菌在消化系统中的过度繁殖会影响古菌群落的稳定。
Effect of organic load regulation on anaerobic digestion performance and microbial community of solar-assisted system of food waste
The semi-continuous digestion experiment of food waste was carried out based on a solar-assisted heat anaerobic digestion reactor. The effects of organic load regulation (OLR of 2.0, 4.0, 6.0 and 7.0 kg m−3 d−1 VS (volatile solid)) on methane production, physical and chemical parameters, and microbial community structure were studied. The results showed that 6.0 kg m−3 d−1 VS could achieve the optimal methane production as the anaerobic digestion limit OLR of kitchen waste. At this stage, the accumulation of organic acids in the reactor led to a great fluctuation of pH. Artificial alkali regulation could restore the stable operation of the reactor, but the reactor could not withstand the OLR shock of 7.0 kg m−3 d−1 VS. In addition, Qualcomm sequencing results showed that microorganisms showed high functional concentration and poor community richness under low OLR, and increasing OLR could promote microbial richness. At the same time, the Methanosaeta of acetic acid methanogens was relatively abundant in the low OLR stage, while the hydrogen trophic methanogenic bacteria Methanoregula and Methanospirillum showed high activity in the high OLR stage, but the excessive reproduction of acidogenic bacteria in the digestive system would affect the stability of the archaea community when the OLR was too high.
期刊介绍:
Journal of Water Reuse and Desalination publishes refereed review articles, theoretical and experimental research papers, new findings and issues of unplanned and planned reuse. The journal welcomes contributions from developing and developed countries.