摘要
为提高沼气中CH^4的含量,对餐厨垃圾采用高固态厌氧发酵,并利用嗜氢产甲烷菌的代谢作用,在外源通入H2的情况下对沼气进行异位生物提纯,并分析了耦联反应中的气体组分。结果表明:厌氧发酵产生的沼气中CH4浓度为52.4%,CO^2浓度为22.8%;经过生物提纯,CH^4提高了36.3%,而CO^2下降了42.1%;在生物提纯相,H2全部消耗,但仍有13.2%的CO^2剩余。进一步研究了提纯阶段的最适通气比例(H^2∶CO^2),分析了反应过程中的CH^4产率,气体组分,H^2转化率和挥发性脂肪酸(VFA)。结果表明:H^2和CO^2比例为5∶1是沼气提纯的最佳通气比例,该条件下CH^4产率、CH^4体积分数和H2转化率最高,分别为693.7 mL·(L·d)^-1、69.4%和98.7%;将最佳通气比例应用到耦联实验中,CH^4体积分数达到96.1%,H^2和CO^2分别为0.3%和1.8%。通过分析可知,当H^2和CO^2通气比为5∶1时,厌氧发酵产生的沼气经生物提纯后,可达到生物甲烷的品质。
In order to increase the CH^4 content in the biogas,the food waste was treated by high-solid anaerobic digestion,and the biogas was ex-suit upgraded through the metabolism of hydrogenotrophic methanogens by exogenous H^2 injection.The gas composition in the coupling reaction was analyzed,the results showed that the content of CH^4 and CO^2 was 52.4%and 22.8%in the biogas produced from anaerobic digestion,respectively.The CH^4 increased by 36.3%after biological upgrading,while CO^2 decreased of 42.1%.H^2 was consumed completely at the biogas upgrading stage,but 13.2%of CO^2 was remained.The optimal injection gas ratio(H^2∶CO^2)in the upgrading stage was further studied.The CH^4 yield,gas composition,H^2 conversion rate and volatile fatty acids during the reaction process were indicated.The results showed that the H^2∶CO^2 injection gas ratio of 5∶1 was the optimum rate for biogas upgrading,the CH^4 yield,CH^4 content and H^2 conversion rate were the highest of 693.7 mL·(L·d)^-1,69.4%and 98.7%,respectively.The optimum injection gas ratio was utilized to the coupling experiment,the volume rate of CH^4,H^2 and CO^2 was 96.1%,0.3%and 1.8%,respectively.The experiment results showed that biogas produced from anaerobic digestion can be upgraded to the biomethane when H^2 and CO^2 injection gas ratio was 5∶1.
作者
汤晴
徐锦
徐利锋
赵兴树
赵明星
阮文权
TANG Qing;XU Jin;XU Lifeng;ZHAO Xingshu;ZHAO Mingxing;RUAN Wenquan(School of Environment and Civil Engineering,Jiangnan University,Wuxi 214122,China;Jiangsu Key Laboratory of Anaerobic Biotechnology,Jiangnan University,Wuxi 214122,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2019年第11期2701-2710,共10页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金青年科学基金资助项目(51508230)
国家自然科学基金资助项目(51678279).
关键词
餐厨垃圾
厌氧发酵
沼气
生物提纯
通气比例
food waste
anaerobic digestion
biogas
biological upgrading
injection gas ratio
