Anaerobic Co-Digestion of Water Hyacinth and Sheep Waste
Abstract
Water hyacinth (WH) and sheep waste (SW) can be used to generate energy which could save on the fossil fuels
conventionally used as source of energy. In this study, the possibility was explored to mix water hyacinth with sheep
waste in different combinations for anaerobic co-digestion, so that energy can be generated as biogas and at the same
time digested sludge can be used as fertilizer for agricultural applications. Pretreatment of water hyacinth was done
by alkali method. Anaerobic co-digestion was carried out in mesophilic temperature range of 30°C to 37°C with
different fermentation slurries of 8% total solids. Co-digestion was carried for a retention period of 60 days. The gas
produced was collected by the downward displacement of water, and was subsequently measured and analyzed.
Fermentation slurry SW3 (mixing ratio of 4: 12.01:83.90 for Water Hyacinth: Sheep Waste: Water) was found to be
optimum, which gave the highest biogas yield of 0.36 l/gVS. with composition 60.84% % CH4, 21.53% CO2 and
17.63% others (H2, N2, H20 and H2S). The overall results showed that blending water hyacinth with Sheep waste had
significant improvement on the biogas yield.
© 2013 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of the Research
Center in Energy and Environment, Thaksin University.
Key words: Anaerobic Co-Digestion; Cumulative Biogas Production; Water Hyacinth; Sheep waste; Inoculums
Anaerobic Co-Digestion of Water Hyacinth and Sheep WasteAbstractWater hyacinth (WH) and sheep waste (SW) can be used to generate energy which could save on the fossil fuelsconventionally used as source of energy. In this study, the possibility was explored to mix water hyacinth with sheepwaste in different combinations for anaerobic co-digestion, so that energy can be generated as biogas and at the sametime digested sludge can be used as fertilizer for agricultural applications. Pretreatment of water hyacinth was doneby alkali method. Anaerobic co-digestion was carried out in mesophilic temperature range of 30°C to 37°C withdifferent fermentation slurries of 8% total solids. Co-digestion was carried for a retention period of 60 days. The gasproduced was collected by the downward displacement of water, and was subsequently measured and analyzed.Fermentation slurry SW3 (mixing ratio of 4: 12.01:83.90 for Water Hyacinth: Sheep Waste: Water) was found to beoptimum, which gave the highest biogas yield of 0.36 l/gVS. with composition 60.84% % CH4, 21.53% CO2 and17.63% others (H2, N2, H20 and H2S). The overall results showed that blending water hyacinth with Sheep waste hadsignificant improvement on the biogas yield.© 2013 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of the ResearchCenter in Energy and Environment, Thaksin University.Key words: Anaerobic Co-Digestion; Cumulative Biogas Production; Water Hyacinth; Sheep waste; Inoculums
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