期刊
INDUSTRIAL CROPS AND PRODUCTS
卷 160, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.indcrop.2020.113097
关键词
Corn stover; Acidogenesis; Methanogenesis; Volatile fatty acids; Microbial community
资金
- National Key Research and Development Program of China [2018YFE0106400]
- Shandong Provincial Natural Science Foundation [ZR2018LB031]
- Youth Science and Technology Innovation Team of Shandong Colleges and Universities [2019KJD002]
- Key Technology Research of Harmlessness, Reduction and Recycling of Solid Waste [2020KJC-ZD12]
- Jinan Science and Technology Program [201913013]
This study investigated the methanogenic performance and microbial communities in UASB reactors treating acidogenic metabolites from ensiled corn stover, focusing on the conversion of volatile fatty acids and the effects of different organic loading rates. The removal rate of chemical oxygen demand reached above 80.0% at an OLR of 8 g/L.d, with a significant improvement in volumetric methane production rate. However, when the OLR reached 10 g COD/L.d, the accumulation of acetic and propionic acids led to methane production failure. The study also compared microbial communities in anaerobic sludge at OLR of 8 g COD/L.d and analyzed the shift of bacteria and archaea.
Methanogenic performance and microbial communities including both bacteria and archaea in UASB reactor treating acidogenic metabolites from acidification of ensiled corn stover (ECS) were investigated. Gradient organic loading rates (OLRs) were adopted to study the conversion of volatile fatty acids (VFAs) characterized by high concentration of acetic acid and propionic acid. The removal rate of chemical oxygen demand (COD) reached above 80.0 % at OLR of 8 g/L.d and volumetric methane production rate improved significantly as the OLR increased. When OLR was 10 g COD/L.d, acetic and propionic acids in effluent were accumulated and failure of methane production occurred. Compared with the control, the methanogenic inhibition was caused by the presence of high concentration of propionic acid. The profile of conversion of individual VFAs in UASB reactors was investigated at different OLRs. Furthermore, microbial communities in anaerobic sludge at OLR of 8 g COD/L.d were compared with those in inoculum and the shift of bacteria and archaea were analyzed. The abundances of some representative acetogenic bacteria such as Proteobacteria (14.18 %) and Bacteroidetes (11.16 %) increased obviously, which contributed to the oxidation and decomposition of organic acids. Acetotrophic methanogen (Methanosaeta) and hydrogenotrophic methanogen (Methanobacterium) played synergistic roles with acetogens to efficiently complete the VFAs conversion. This study will be of great importance to guide the application of two-phase AD of agricultural waste in full-scale plant.
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