Enhancement anaerobic digestion and methane production from kitchen waste by thermal and thermo-chemical pretreatments in batch leach bed reactor with down flow

Seyed Abbas Radmard, Hossein Haji Agha Alizadeh and Rahman Seifi
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Seyed Abbas Radmard: Department of Biosystem, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran
Hossein Haji Agha Alizadeh: Department of Biosystem, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran
Rahman Seifi: Department of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran

Research in Agricultural Engineering, 2018, vol. 64, issue 3, 128-135

Abstract: The effects of thermal (autoclave and microwave irradiation (MW)) and thermo-chemical (autoclave and microwave irradiation - assisted NaOH 5N) pretreatments on the chemical oxygen demand (COD) solubilisation, biogas and methane production of anaerobic digestion kitchen waste (KW) were investigated in this study. The modified Gompertz equation was fitted to accurately assess and compare the biogas and methane production from KW under the different pretreatment conditions and to attain representative simulations and predictions. In present study, COD solubilisation was demonstrated as an effective effect of pretreatment. Thermo-chemical pretreatments could improve biogas and methane production yields from KW. A comprehensive evaluation indicated that the thermo-chemical pretreatments (microwave irradiation and autoclave- assisted NaOH 5N, respectively) provided the best conditions to increase biogas and methane production from KW. The most effective enhancement of biogas and methane production (68.37 and 36.92 l, respectively) was observed from MW pretreated KW along with NaOH 5N, with the shortest lag phase of 1.79 day, the max. rate of 2.38 l.day-1 and ultimate biogas production of 69.8 l as the modified Gompertz equation predicted.

Keywords: autoclave; microwave irradiation; kitchen waste; methane; modified Gompertz equation (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlrae:v:64:y:2018:i:3:id:16-2017-rae

DOI: 10.17221/16/2017-RAE

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