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Evaluation of the Effect of Total Solids Concentration on Biogas Yields of Agricultural Wastes

Author Affiliations

  • 1 Chemistry Department, Taraba State University, P.M.B 1167, Jalingo – Taraba State

Int. Res. J. Environment Sci., Volume 3, Issue (2), Pages 70-75, February,22 (2014)

Abstract

Agricultural wastes (groundnut shell, maize cobs and rice straw) which are relatively found in abundance due to increase agricultural activities contain mainly of organic content, which decomposes under anaerobic conditions. Various total solids (TS) concentrations of these wastes influence on the amount of biogas generated was studied in order to determine the conditions for optimum gas generation. Five (5) sets of bio-digesters were utilized, each contains varying amount of the total solids, and biogas production was measured indirectly by the saline water displacement method. It was observed that, the amount of gas generated from these substrates decreases with decreasing and increasing the percentage total solid concentration below and above the optimum value of 9% Total Solids which gave the maximum volume of biogas generated for the three substrates to be 325ml, 468ml and 680ml respectively. The result shows that bio-digester C (Rice Straw) at PTS concentration 9% had the highest yield of biogas with cumulative volume of 680ml. Therefore, the efficiency of gas production could be seen decreased with increasing total solid concentration yielding approximately 43.2% more gas/gTS at 9% TS than 12% TS.

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