热处理对猪粪高固厌氧消化产甲烷能力的影响

Impact of Thermal Treatment on Biogas Production by Anaerobic Digestion of High-solid-content Swine Manure

畜禽粪便属于有机物含量高、卫生风险大的污染物.本研究探寻不同热处理时间下,猪粪(含固率27.6%)不稀释直接进行70℃热处理的情况及热处理对中温高固厌氧消化的影响.结果表明,热处理能够去除猪粪的部分有机物,并能明显提高高固厌氧消化的产甲烷能力和产甲烷速率.热处理时间为1、2、3和4 d时,热处理对猪粪的VS去除率分别为15.1%、15.5%、17.8%、20.0%,甲烷产率(以CH4/VSadd计)分别为284.4、296.3、309.2、264.4 m L·g-1,相比原粪的甲烷产率分别提高49.7%、55.9%、62.7%、39.2%.热处理时间为3 d时,猪粪的甲烷产率最高.热处理对猪粪产甲烷的促进效果显著,能耗适中,并能够起到巴氏消毒的作用,具有较好的工程价值.

Livestock manure is a kind of waste with high organic content and sanitation risk. In order to investigate the impact of thermal treatment on the anaerobic digestion of high-solid-content swine manure,70℃ thermal treatment was conducted to treat raw manure( solid content 27. 6%) without any dilution. The results indicated that thermal treatment could reduce the organic matters and improve the performance of anaerobic digestion. When the thermal treatment time was 1d,2d,3d,4d,the VS removal rates were15. 1%,15. 5%,17. 8% and 20. 0%,respectively. The methane production rates( CH4/ VSadd) were 284. 4,296. 3,309. 2 and264. 4 m L·g-1,which was enhanced by 49. 7%,55. 9%,62. 7% and 39. 2%,respectively. The highest methane production rate occurred when the thermal treatment time was 3d. The thermal treatment had an efficient impact on promoting the performance of methane production rate with a suitable energy consumption. On the other hand,thermal treatment could act as pasteurization. This showed that thermal treatment would be of great practical importance.