Characterization and Thermophilic Anaerobic Digestion of Organic Fraction of Municipal Solid Waste
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To investigate the characteristics, pretreatment effects and methane production potential of organic fraction of municipal solid waste (OFMSW), machine-separated OFMSW (MS-OFMSW) and machine-with floating-separated OFMSW (MFS-OFMSW) were digested under batch thermophilic anaerobic digestion conditions in this assay.
The MS-OFMSW and MFS-OFMSW samples were digested in four 1 L batch digesters at initial volatile solids (VS) loadings of 3 g VS/L, each in duplicate, and at a thermophilic temperature (50 ± 2 °C). The effective volume of each digester was 0.5 L and the corresponding substrate to inoculum (S/I) ratio was 0.5. The digestion time for biochemical methane potential test was 30 days.
Results showed that 76.5 % of OFMSW was made up of papers and small organics. The volatile solids to total solids (VS/TS) ratios of MS-OFMSW and MFS-OFMSW were approximately 50 and 80 %, respectively. The C/N ratios for MS-OFMSW and MFS-OFMSW were found to be 18.3 and 15.5, respectively. For biogas and methane yields, on the basis of VS, there were no significant differences (p > 0.05) between MS-OFMSW and MFS-OFMSW, respectively. However, on a TS basis, the biogas and methane yields of MFS-OFMSW were 534.8 and 325.9 mL/g TS, respectively, which were 49.8 and 48.3 % higher than those of MS-OFMSW.
Mechanical separation combined with floating separation could be an efficient way to increase the biodegradability of OFMSW.
KeywordsOrganic fraction of municipal solid waste (OFMSW) Machine and floating pretreatment Thermophilic anaerobic digestion Biochemical methane potential (BMP)
Biochemical methane potential
Experimental biogas yield
Experimental methane yield
Hydraulic retention time
Organic fraction of municipal solid waste
Machine- and floating-separated OFMSW
Specific methanogenic activity
This work was partly supported by Science Foundation of China University of Petroleum, Beijing (No. 2462014YJRC034). The authors also acknowledge financial support from China Scholarship Council. We appreciate assistance provided by Ruihong Zhang, Steve Zicari, Natthiporn Aramrueang, Asato Caitlin, Mianfeng Zhang, and Xiaoying Liu, Department of Biological and Agricultural Engineering, University of California, Davis, USA.
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