BMW厌氧消化过程中产气性能影响因素研究

研究了农贸市场生物废弃物进行不同接种物浓度、颗粒度及pH值的厌氧发酵产气特性。结果表明:适宜的接种物浓度有利于微生物的生长、产气速率加快、产气量增大,接种物浓度为5/3和5/4在反应13天日产气量达到1400ml,甲烷含量超过50%以上;不同粒径下生物气体产量和甲烷气含量均有差异,颗粒度对发酵产气有一定影响,颗粒粒径的减小可使得表面积增大,提高气体产量,同时粒径的减小可以提高消化速率,可以促进生物过程,尤其是对起始的水解反应的促进,1cm大小的粒径在日产气量居最高水平达到1290ml,甲烷气体含量高达到51%;上料前初始pH值的调节有利于厌氧反应产生甲烷,碱度的作用主要是提供体系保持中性pH所需要的缓冲能力,将发酵液初始pH值调节至弱碱性,有利于厌氧发酵产气,增加甲烷含量,发酵罐中初始pH值调控为7.5的发酵罐产气量大且甲烷含量超过57%。

Effect of Factors on the Capability of Biogas Production in Anaerobic Fermentation for BMW

The effect of factors, like the ratio of material and sludge, the degree of granule and different pH in anaerobic fermentation, on the production of biogas was studied. The result showed that a good ratio of material and sludge was beneficial to the growth of microorganism, the velocity of the volume and biogas production daily. It was also said the volume of biogas was up to 1400ml and the content of methane was more than 50% on the thirteenth day when the ratio of material and sludge was 5/3 or 5/4. There was a great difference in the volume of biogas and the content of methane in different size. It was beneficial to improve the volume and the velocity of biogas production, especially the hydrolyzing reaction and the digesting process by decreasing the size. It was shown that the content of methane was up to 51% and the volume of biogas was to 1290ml daily when the granule size was lcm. It was also propitious to produce the biogas and enhance the content of methane, When the pH was 7,5, the volume of biogas production was much more and the content of methane was more than 51%.