摘要
建立微氧连续通入沼气厌氧发酵中试装置,实现H2S原位脱除的目的。以水稻秸秆为原料进行高温(55℃)发酵,探究沼气微氧发酵过程中通氧量对H2S原位脱除及微生物群落特征的影响。结果表明,微量O2的通入使得发酵平稳期沼气产气量、甲烷产量及甲烷体积分数明显增加,但与O2通入量不成正比;通氧量以150 mL·L^-1·d^-1为宜,此时沼气产气量高出对照组约23%,甲烷产量也最大,并高出对照组约27%。H2S的去除率随通氧量的增加而提高,通氧量为150 mL·L^-1·d^-1时,H2S脱除效率达98.0%,且沼气中残留的O2体积分数可控制在0.5%以下;微量O2的通入可明显促进挥发性脂肪酸的降解,pH可维持在7.0~8.5,有效提高了沼液中化学需氧量及总固体的降解率。微氧条件下发酵液中微生物多样性仅有轻微变化,古菌和细菌的群落结构也未受明显影响。
A pilot experimental system was set up for biogas fermentation with continuous microaerobic input to fulfill in situ desulfurization. Effects of oxygen quantity on in-situ H2 S removal and microbial community characteristics were studied using rice straw as the substrate under thermophilic condition(55 ℃). The results show that biogas production, methane production and methane content increase significantly with the introduction of trace oxygen, and the values are not directly proportional to oxygen supply. When studied under the optimal oxygen supply of 150 m L×L^-1×d^-1, the biogas production was about 23% higher and methane production was 27% higher than those of control. The removal rate of H2 S was gradually improved with the increase of oxygen supply. When the oxygen supply was 150 mL×L^-1×d^-1, the removal efficiency reached 98.0%and the residual oxygen content in biogas was controlled below 0.5%. The degradation of volatile fatty acids was significantly promoted by the introduction of micro-oxygen, and pH was maintained in the range of 7.0~8.5.The degradation rates of chemical oxygen demand and total solid in biogas slurry were effectively increased.Under microaerobic condition, the microbial diversity in biogas slurry changed slightly and the community structures of archaea and bacteria were not obviously affected.
作者
程玉娥
邓小宁
楼毕觉
林春绵
CHENG Yu-e;DENG Xiao-ning;LOU Bi-jue;LIN Chun-mian(College of Environment,Zhejiang University of Technology,Hangzhou 310014,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2019年第4期980-988,共9页
Journal of Chemical Engineering of Chinese Universities
基金
中德合作项目-德国罗伯特·博世基金会(Robert Bosch Stiftung)基金(32.5.8003.0078.0)
关键词
秸秆
微氧发酵
硫化氢
微生物群落
straw
microaerobic fermentation
hydrogen sulfide
microbial community
