Experimental Investigation of Biogas Production from Kitchen Waste Mixed with Chicken Manure

Abstract

ogas produced from solid kitchen waste (KW) mixed with chicken manure (M) at different mass ratios was investigated. The effect of the ratio of the amount of water to the mixed solid waste on the amount of biogas produced was studied. The results showed that at a fixed ratio of water-to-solid waste, the amount of biogas increased as the amount of chicken M increased. At a fixed M-to-KW ratio, the amount of biogas produced increased as the solid content increased and then decreased, reaching its maximum value at a solid waste-to-water ratio of 1:1. The pH of the bioreactor containing the KW-M mixture dropped with time, resulting in a decrease in the amount of biogas produced. Controlling the pH value by titrating with NaOH solution improved the production of biogas. Investigating biogas produced from sludge showed that the pH of the reactor slightly decreased and then increased slightly. The results also showed that the amount of biogas produced from sludge containing 3% solid waste was larger than the amount produced from sludge containing 6% solid waste.

Anaerobic co-digestion of food waste, goat and chicken manure for sustainable biogas production

“…Biogas yield of mono digestion of food waste was11.2 ml/gVS which is very low. Lower methane yield could be due to high biodegradability of FW which causes problems in the progress of the digestion process because the production of VFA was faster than their conversion into methane [22]. As a result, the pH got reduced to a range of 4-5 which eventually slower down the gas production.…”

“…Co-digestion of food waste with manure up to 60% of the initial volatile solids (VS) significantly increase the methane yield at mesophilic condition in 20 days HRT [21]. Co-digestion of solid kitchen waste with chicken manure increased biogas production while increasing the solid content to solid to water ratio 1:1 and then starts decreasing the biogas production [22]. This paper intends to contribute to the literature in two ways.…”