微曝气预处理对高固污泥厌氧消化产甲烷的影响

Effects of Microaeration Pretreatment on Methane Production of High-Solid Sludge Anaerobic Digestion

以高固污泥为研究对象,探究额微曝气预处理对污泥厌氧消化产甲烷的影响。实验结果表明微曝气预处理能够强化高固污泥厌氧产甲烷,并且最佳的微曝气强度为0.4 vvm,相应的甲烷产量为312 m L/g挥发性悬浮固体。此外,微曝气有助于溶解性有机物的释放,当曝气强度为0.4 vvm时,溶解性COD与总COD的比值为0.31,溶解性蛋白质和多糖的含量分别为2.5、1.2 g/L,进一步研究发现微曝气能够促进挥发性脂肪酸(VFA)的积累和VSS的减量。微生物种群研究表明微好氧曝气能够促进Firmicutes的相对丰度,并且在0.4 vvm曝气强度作用下,Firmicutes的相对丰度为40.6%。

Methane production of anaerobic digestion influenced by pretreatment of high-solid sludge was studied by using micro-aeration technology. The bench-scale experimental study showed that the pretreatment using micro-aeration could enhance the methane production of high-solid sludge anaerobic digestion; the optimum micro-aeration intensity was 0.4 vvm（volume per volume minute）; and correspondingly, methane yield was 312 m L/g VSS（volatile suspended solids）. In addition,microaeration was conducive to the release of soluble organic matter, when the aeration intensity was as high as 0.4 vvm the ratio of soluble COD to total COD was 0.31, and the content of soluble protein and polysaccharide was 2.5 and 1.2 g/L, respectively. Furthermore, it proved that microaeration accelerated VFA（volatile fatty acids） accumulation and VSS reduction;and the investigation of microbial population suggested that micro-aerobic aeration improved the relative abundance of Firmicutes, the relative abundance of Firmicutes being 40.6% under the aeration intensity of 0.4 vvm.