Metabolic performance of anaerobic digestion of chicken manure under wet, high solid, and dry conditions

• Published in: Bioresource technology 2020-01, Vol.296, p.122342-122342, Article 122342
• Main Authors: Bi, Shaojie, Westerholm, Maria, Qiao, Wei, Xiong, Linpeng, Mahdy, Ahmed, Yin, Dongmin, Song, Yunlong, Dong, Renjie
• Format: Article
• Language: English
• Subjects: Anaerobic digestion; Anaerobiosis; Animals; Bioenergi; Bioenergy; Biofuels; Bioreactors; Chicken manure; Chickens; Manure; Methane; Methanogenic pathway; Microbial community; Organic loading rate
• ISSN: 0960-8524; 1873-2976; 1873-2976
• DOI: 10.1016/j.biortech.2019.122342

•AD of chicken manure was investigated under wet, high solid and dry conditions.•Wet system work well, high solid system was challenged, dry system failed.•The methanogenic pathway shift towards to SAO-HM under higher ammonia and OLR.•Hydrogenotrophic methanogen tend to dominate under stressed environment. The anaerobic digestion (AD) of chicken manure as a solo substrate has been challenging due to the ammonium inhibition effects when adopting a high organic loading rate (OLR). In this study, through increasing both the total solid in the feeding materials from 5% to 20%, and the OLR from 1.7 to 7.1 g-volatile solids (VS)/(L·d), the AD of chicken manure under wet, high solid, and dry conditions, with a fixed hydraulic retention time of 20 days, was investigated. The results obtained indicated that the wet AD system could achieve a methane yield of 0.28 L/g-VS and a low volatile fatty acid level. However, the process deteriorated under dry conditions, and methane formed mainly through acetate oxidation and methanogenesis. Methanosarcina and Methanoplasma were found to be more tolerant But, whether the dry AD of chicken manure can survive an ammonia-stressed environment when the OLR is lowered, still needs investigation.