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Optimization and Modeling of Biogas Production From Green Waste/Biowaste Co‐Digestion Using Leachate and Sludge
Author(s) -
Abdelhay Arwa,
Albsoul Abeer,
Hadidi Fatimeh,
Abuothman Abeer
Publication year - 2016
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201500514
Subject(s) - leachate , biogas , anaerobic digestion , methane , sewage sludge , waste management , volume (thermodynamics) , municipal solid waste , environmental science , biogas production , green waste , pulp and paper industry , environmental engineering , chemistry , sewage , engineering , physics , organic chemistry , quantum mechanics , compost
In most countries, green waste (GW) is abundant throughout the year and it is usually mixed with the organic fraction of municipal solid waste, which is called in this paper municipal biowaste (MBW). GW is characterized by a slow biodegradability, which minimizes its biogas revenues. The goal of this work was to determine optimal GW/MBW mixing ratios and old landfill leachate/sewage sludge inoculum ratios for optimal biogas production. Co‐digestion tests of GW and MBW were conducted at MBW/GW of 0:100, 30:70, 50:50, and 60:40 based on dry volatile solids (VS). A maximum biogas production yield of (318 mL/g VS) was attained at MBW/GW ratio of 60:40 using leachate as inoculum. The effect of landfill leachate/sewage sludge ratio on GW digestion was evaluated at four different ratios. The peak biogas yield was obtained at leachate/sludge ratios of 50:50 and 30:70. The design of experiment (DOE) was used to optimize and model the methane content and the biogas cumulative volume produced from co‐digestion at different VS and leachate percentages. An empirical model was obtained for the biogas cumulative volume and methane content with R 2 ‐values of 0.90 and 0.72, respectively. The optimal biogas volume of 3416 mL and the maximum methane content (73%) were both obtained at 37% leachate and 9.5 g/L as VS which corresponds to an MBW/GW ratio of 60:40.