ENHANCEMENT OF BIO-METHANE PRODUCTION BY LIGNOCELLULOSE SUBSTRATES

摘要

In this study, water hyacinth, sweet sorghum bagasse and amaranth stems were used in a pig manurernmatrix to produce biogas with a high methane content. The anaerobic digestion was monitored over a period of 40rndays, after which the biogas production significantly decreased. Samples were taken of the gas and the leachaternevery 5 days to monitor the production of gas and to evaluate the formation of volatile fatty acids in the leachate. ThernpH of the leachate was monitored using a pH meter and the cell growth in the leachate was monitored usingrnultraviolet spectrometry. The biogas composition was determined using gas chromatography and the volatile fattyrnacids in the leachate was quantified using HPLC. It was found that the addition of lignocellulose to a pig manurernmatrix resulted in a significant increase in the methane content and a decrease in the carbon dioxide content of thernbiogas. The leachate contained high amounts of volatile fatty acids such as acetic acid, lactic acid, succinic acids andrnbutyric acid. The research showed that co-digestion in an anaerobic digester can be used to manipulate therncomposition of both the produced biogas and the leachate obtained after digestion.