Abstract
The aim of this study was to treat food waste containing 25% total solids (TS) through dry anaerobic digestion (dry AD) process at various pressures (0.5 to 2.5 kg/cm2) and different time duration (20 to 100 min) to understand the impact of pretreatment in enhancing the methane generation potential along with insights on scale up. The findings revealed that vs. reduction and methane yield of 60% and 0.25 L CH4/(g VSadded) can be achieved with pretreated food waste at two kilograms per square centimeter, while pretreatment of food waste at 2 kg/cm2 for 100 min enhanced the vs. reduction from 60% to 85% and methane yield from 0.25 to 0.368 L CH4/(g VSadded). However, the net energy indicated that 40 min of pre -treatment at two kilograms per square centimeter can be a suitable option as methane yield and vs. reduction of 0.272 L CH4/(g VSadded) and 70%, respectively was achieved. The vs. reduction and the methane yield of 45% and 0.14 L CH4/(g VSadded), respectively was obtained from untreated food waste which illustrated that pretreatment had significantly impacted on the enhancement of methane generation and organic matter removal which can make the dry AD process more attractive and feasible at commercial scale.
Highlights
Huge quantities of municipal solid waste (MSW) are accumulating in most of the developed and developing countries due to rapid industrialization and urbanization, which needs a sustainable treatment solution [1,2,3]
Biologic pretreatment of food waste for the production of methane in an up flow anaerobic sludge blanket reactor was studied and the results showed that 95% more soluble chemical oxygen demand (COD) removal efficiency was obtained with a methane yield of 0.35 L-CH4 /g-soluble COD [24]
The food waste and pretreated food waste was initially characterized for pH, total solids (TS), volatile solids (VS), moisture content (MC), chemical oxygen demand (COD), soluble COD, alkalinity (Alk) and biologic oxygen demand (BOD) as per the standard procedures mentioned in APHA [28]
Summary
Huge quantities of municipal solid waste (MSW) are accumulating in most of the developed and developing countries due to rapid industrialization and urbanization, which needs a sustainable treatment solution [1,2,3]. Questions related to the final disposal and treatment of municipal solid waste (MSW) constitutes one of the most serious problems of contemporary societies. Food waste—a part of the OFMSW which includes cooked and uncooked food—is generated from various sources, such as canteens, hotels, households, gated communities, function halls and various food processing industries, etc [7] If this is treated in a decentralized manner at source using best possible AD technology, it becomes remunerative [1]
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