Abstract
Anaerobic digestion (AD) has been used widely as a form of energy recovery by biogas production from the organic fraction of municipal solid wastes (OFMSW). The aim of this study was to evaluate the effect of the introduction of co-substrates (restaurant wastes, corn whole stillage, effluents from the cleaning of chocolate transportation tanks) on the thermophilic anaerobic digestion process of the mechanically separated organic fraction of municipal solid wastes in a full-scale mechanical-biological treatment (MBT) plant. Based on the results, it can be seen that co-digestion might bring benefits and process efficiency improvement, compared to mono-substrate digestion. The 15% addition of effluents from the cleaning of chocolate transportation tanks resulted in an increase in biogas yield by 31.6%, followed by a 68.5 kWh electricity production possibility. The introduction of 10% corn stillage as the feedstock resulted in a biogas yield increase by 27.0%. The 5% addition of restaurant wastes contributed to a biogas yield increase by 21.8%. The introduction of additional raw materials, in fixed proportions in relation to the basic substrate, increases biogas yield compared to substrates with a lower content of organic matter. In regard to substrates with high organic loads, such as restaurant waste, it allows them to be digested. Therefore, determining the proportion of different feedstocks to achieve the highest efficiency with stability is necessary.
Highlights
IntroductionAnaerobic digestion (AD) is a naturally occurring process in which organic matter is converted into a biogas (a combination of methane and carbon dioxide) and a digestate (semi-solid residue), by microorganisms in the absence of oxygen [1,2,3,4]
Anaerobic digestion (AD) is a naturally occurring process in which organic matter is converted into a biogas and a digestate, by microorganisms in the absence of oxygen [1,2,3,4]
The full-scale pilot plant was evaluated according to single substrate AD with the OFMSW
Summary
Anaerobic digestion (AD) is a naturally occurring process in which organic matter is converted into a biogas (a combination of methane and carbon dioxide) and a digestate (semi-solid residue), by microorganisms in the absence of oxygen [1,2,3,4]. The process can be engineered and optimized in dedicated plants to maximize the biogas production. The process can be conditioned by various operating factors. The most impacting process performance factors are feed rate, solid content, temperature, and retention time [1,2,4,5,6]. Conventional municipal solid wastes (MSW) management is based on disposal to land-fill, where AD occurs naturally. A system of wells and pipes collects the biogas which can be burnt in Combined Heat and Power (CHP) units to produce heat and electricity or burnt directly in a flare
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