title: Evaluation of single vs. staged mesophilic anaerobic digestion of kitchen waste with and without microwave pretreatment.
abstract: Effects of single and dual stage (acidogenic-methanogenic) mesophilic anaerobic digestion (AD) of kitchen waste (KW) was evaluated at hydraulic retention times (HRTs) of 20, 15, 12 and 9 d with and without thermal microwave (MW) pretreatment (145 °C). Anaerobic acidification in terms of acid accumulation was superior compared to microaerophilic acidification. Maximum anaerobic acidification of KW was determined to occur with an HRT of 2 d which was then selected for the acidification stage. The dual stage AD system fed with untreated KW produced the maximum biogas and volatile solids (VS) stabilization efficiencies at the shortest HRT of 9 d. Conversely, for free liquid resulting from MW pretreatment of KW the two stage reactor at 20 d HRT produced three fold more methane compared with the untreated free liquid control. However, MW pretreatment and AD of the free liquid fraction only, was not a sustainable treatment option. For KW, staging of the AD process had a greater positive impact on waste stabilization and methane yield compared to single stage reactors or MW pretreatment. KW can be characterized as being a readily biodegradable solid waste; concomitantly it is recommended that digester staging without MW pretreatment be employed to maximize methane yield and production.
authors: Department of Civil Engineering, University of Ottawa, 161 Louis Pasteur Pvt., CBY A106, Ottawa, Ontario K1N 5B4, Canada. haleh.shahriari@gmail.com
authors: Haleh
authors: H
authors: Shahriari
authors: Mostafa
authors: M
authors: Warith
authors: Mohamed
authors: M
authors: Hamoda
authors: Kevin
authors: K
authors: Kennedy
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D056804:Biofuels / Q000032:analysis; D005502:Food; D008697:Methane / Q000032:analysis; D008872:Microwaves; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage
chemical_list: D056804:Biofuels; D012722:Sewage; D008697:Methane