Abstract
Global warming caused by energy generation from fossil fuel has accelerated the deployment of renewable fuels such as biogas. In this study, batch fermentation (5L) was studied to observe the effect of natural water, cow dung, rice straw and water hyacinth ratio on the biogas and methane production at ambient temperature (31°C), 7.1-7.4 of pH for 52 days. The five types of co-digestion were 2:1:1:1 (digester A), 1:1:1:1 (digester B), 0.5:1:1:1 (digester C), 1:1:1:0 (digester D) and 1:1:0:1 (digester E), respectively. The result showed that the biogas production increased progressively with amount of natural water to raw material. The maximum biogas production and methane concentration was 1650 mL/days and 61.47% was obtained at substrate mixture 2:1:1:1 (digester A), which there are suitable of C:N ratio at 31.1:1. Natural water, cow dung, rice straw and water hyacinth was mixed for biogas production, have been found to improve highest biogas production compared to those of without rice straw and water hyacinth. Therefore, the mixing natural water, cow dung, rice straw and water hyacinth can improve both biogas production and content of methane in biogas.
Highlights
The environment-friendly biogas produced from increased, while fossil fuel supplies are depleting and anaerobic digestion can help for utilizing of wastes, such oil prices are rising
This study aims to achieving the following: (i) chemical content of raw materials are carried out by CHNS analysis, (ii) biogas production by co-digestion on small batch reactors using agricultural wastes and an undefined bacterial consortium derived from anaerobic cow dung compost as inoculum and (iii) analysis of methane content and biogas production are performed by the gas chromatography
The raw materials used for this experiment were natural water, cow dung, rice straw and water hyacinth, which were collected from LopburiProvice, Thailand
Summary
The environment-friendly biogas produced from increased, while fossil fuel supplies are depleting and anaerobic digestion can help for utilizing of wastes, such oil prices are rising. NaponKeanoi et al / American Journal of Environmental Science 9 (6): 529-536, 2013 plant and animal origin waste materials, which consist mainly of carbohydrates, lipids and proteins, in releasing extracellular enzyme by bacteria. This stage is known as polymer breakdown stage. Acideogenesis and acetogenesis produced in stage 1 is fermented under anaerobic condition into various acids with the help of enzymes produced by the acid forming bacteria. At this stage, the acid-forming bacteria break down molecules of six atoms of carbon (glucose) into less atoms of carbon (acids) molecules. The above equations showed that many products, byproducts and intermediate products are produced in the process of digestion in an anaerobic condition before the final product (methane) is produced
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