High-solids anaerobic digestion of organic fraction of municipal solid waste: Effects of feedstock to inoculum ratio and percolate recirculation time

被引:27
作者
Dastyar, Wafa [1 ]
Azizi, Seyed Mohammad Mirsoleimani [1 ]
Dhadwal, Mayank [1 ]
Dhar, Bipro Ranjan [1 ]
机构
[1] Univ Alberta, Civil & Environm Engn, 116 St NW, Edmonton, AB T6G 1H9, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
High-solids anaerobic digestion; Feedstock to inoculum ratio; Percolate recirculation time; Organic fraction of municipal solid waste; Biomethane; FOOD WASTE; CO-DIGESTION; AMMONIA; SLUDGE; BIOAUGMENTATION; DEGRADATION; PROPIONATE; STRAW;
D O I
10.1016/j.biortech.2021.125335
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
The effects of feedstock to inoculum (F:I) ratio and percolate recirculation time (PRT) were studied for the highsolids anaerobic digestion (HSAD) of the organic fraction of municipal solid waste (OFMSW). Six mesophilic HSAD systems were operated at different F:I ratios (1 to 3 kg VS/kg VS; PRT = 2.5 h/d) and PRTs (1.5 to 3.5 h/d; F:I = 2 kg VS/kg VS). The F:I ratio of 1 provided up to 86% of the theoretical methane potential of OFMSW. In contrast, F:I ratio of 3 provided only 34% methane recovery due to volatile fatty acids (VFAs) accumulation and pH drop. Despite F:I ratio of 2 could provide 70% methane recovery, it could enable almost 45% higher organics processing capacity (VS basis) and lower solids washout during percolate recirculation, as compared to the F:I ratio of 1. However, different examined PRTs showed marginal impacts on methane yields with comparable changes in profiles of percolate characteristics.
引用
收藏
页数:9
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