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Biodrying of biogas residue: Maturity and microbial diversity assessment

2022; Elsevier BV; Volume: 10; Issue: 6 Linguagem: Inglês

10.1016/j.jece.2022.108757

2213-3437

Mingyue Xu, Min Yang, Na Song, Dong Xie, Jie Meng, Ming Gao, Qunhui Wang, Chuanfu Wu,

Wastewater Treatment and Nitrogen Removal

Anaerobic digestion has developed as a mainstream method for the treatment of municipal and agricultural solid waste, which is beneficial to long-term development. Simultaneously, a large amount of biogas residue (BR) has been produced. If not correctly processed, it will pollute the environment and waste resources. However, the high moisture content of BR makes transportation and future use difficult. Biodrying can be utilized to cure BR with high moisture content, however few research has been published. The effect of a microbial agent (MA) inoculation on the biodrying of BR was investigated in this work, with a particular focus on maturation performance, material balance computation and microbial community alterations. The inoculation of MA had a significant impact on BR biodrying performance. First, MA inoculation caused 81.0% water loss, which was 46.6% higher than the control group (i.e. without MA inoculation); second, excitation-emission matrix fluorescence spectroscopy analysis revealed that MA inoculation stimulated humic compound formation; third, MA inoculation increased microbial diversity and functional bacteria abundance (e.g. Proteobacteria and Thermotogota), which may be beneficial for nitrogen migration and organic matter maturation. Therefore, biodrying through MA inoculation has the potential to be exploited in the resource use of high-moisture-content BR.