微氧预处理对有机废水厌氧消化产甲烷的影响

Effect of micro-aerobic pretreatment on anaerobic digestion of organic wastewaters for methane production

为了考察微氧预处理对有机废物厌氧消化产甲烷过程的影响,论文以合成废水为试验材料进行了试验研究。结果表明,在厌氧消化反应前进行一定时间的微氧预处理,可以强化水解产酸菌的作用,促进有机底物的水解酸化,从而有效促进甲烷的产生。微氧预处理4h可以提高甲烷产量28%,提高最大产甲烷速率57.5%。10h的预处理则对产甲烷菌具有毒害作用,甲烷产量显著降低,预处理时间过短,促进效果不明显。最佳的预处理时间为4～6h。微氧预处理在控制好处理时间时可促进有机物水解酸化,因此可应用于复杂有机物如厨余垃圾等的厌氧发酵。

Taking synthetic wastewaters as materials,the effects of micro-aerobic pretreatment on anaerobic digestion of organic waste for methane production were investigated in this paper by experiments. The results indicated that micro-aerobic pretreatment before anaerobic digestion could stimulate the activity of the hydrolysis bacteria,thus enhance the acidification of organic substrate and methane fermentation. Methane production was increased by 28% when the wastewater was pretreated for 4 hours under micro-aerobic condition and the maximal methane production rate was also increased by 57.5%. However when the pretreated time was 10 hours,methane production bacteria（MPB） could be poisoned and methane production was greatly decreased. Methane production could not also be increased evidently if the pretreated time was too short. The optimal pretreatment time was 4–6 h. So the micro-aerobic pretreatment process can stimulate the acidification of organic substrate and it may be applied in the anaerobic digestion of complex wastes such as kitchen wastes if the pretreatment time is well controlled.