COUPLING H2-RICH SYNGAS BIOMETHANATION WITH ANAEROBIC DIGESTION OF FOOD WASTE:A PERFORMANCE ANALYSIS
This paper proposed utilizing light fractions of food waste(FW)to produce H2-rich syngas,followed by coupling of H2-rich syngas biomethanation with FW anaerobic digestion.A feasibility study was conducted to evaluate the long-term performance of the coupled system of H2-rich syngas biomethanation and FW anaerobic digestion,as well as its potential in increasing methane production.Both FW anaerobic digestion and H2-rich syngas biomethanation showed stable performance under conditions of FW organic load(in volatile solids)of 0.5 to 2.0 g/(L·d)and H2-rich syngas flow rate of 0 to 5.28 L/d.Moreover,the biogas was upgraded,particularly when the FW organic load was 0.5 g/(L·d)and 1.0 g/(L·d),as the average CH4 content in the product gas reached 96.4％and 86.6％,respectively.Increasing the biomethanation rate in H2-rich syngas and regulating the pH value,effective alkalinity,and organic acid accumulation in the reactor would further improve the treatment capacity and operational stability of the coupled system.The coupling system was expected to increase methane production by 94.5％at a 300 t/d FW treatment plant.A cost-benefit analysis is required to further evaluate the industrial application potential of this coupling process.
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