We measured the biogas and methane yield from two types of paper sludge and three types of organic waste (food waste, vegetable scraps, and pruning branches) by anaerobic digestion. Batch digestion was carried out under mesophilic and thermophilic conditions at volatile solid loads between 0.18 and 0.60 w/v% per reactor. The volume of methane produced from paper sludge from virgin paper pulp (PS-1) was comparable to that from vegetable scraps. However, the other type of paper sludge, from recycled paper (PS-2) was barely digested, owing to the high aluminum content. A kinetic analysis of the gas yields from PS-1 and food waste was carried out using a first-order kinetics model. The gas production rates were constant at a temperature adequate for the inoculum used. Consequently, co-digestion at the mesophilic temperature might be possible, and the deficiency of nitrogen could be compensated for by the addition of food waste to PS-1.
A measuring apparatus for biogas using the gravimetric method was developed and evaluated. The apparatus in this study measured biogas by the catalytic combustion of methane and measurement of the volume of CO 2 . The amount of methane was determined by measuring the amount of CO 2 . Sample biogas mixture was prepared using carbon dioxide and methane in a fixed ratio. The relationship between accuracy of measurement and combustion temperature and premixing air ratio was investigated. Results show that the measurement of carbon dioxide was highly accurate under either experimental condition. However, the measurement of methane was influenced by combustion conditions. At a temperature of 320℃ and a ratio of methane to air of 1.5-8.0 v/v%, measurement of methane was achieved with an accuracy of over 97% (within a coefficient of variation of 2.7 %). Our results also showed that nearly 500ml biogas was necessary to maintain the accuracy of determination.Improved hydrogen sulfide removal is necessary for this apparatus to be applied to measurement of biogas produced by anaerobic digestion, since hydrogen sulfide influences catalysis. However, the determination of biogas after the desulfurization processing is possible if the sample contains 14.3~81.7% methane.
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