Material balance in biogas plant and fertilizer characteristics of digested liquid and digested liquid supernatant
2007
Nakamura, M.(National Inst. of Rural Engineering, Tsukuba, Ibaraki (Japan)) | Yuyama, Y. | Yamaoka, M. | Fujikawa, T.
The balance of materials in a biogas plant was estimated from the operating records of the plant and results of analysis of feedstock and products. Fertilizer characteristics of digested liquid and digested liquid supernatant produced as residues of methane fermentation were evaluated. The results indicated that only 9.8% of C in the feedstock was converted into the C in CH4 during the methane fermentation process. The reason for this was that the feedstock, cattle manure slurry, contained much sawdust derived from bedding material. The-biogas plant and livestock farmer need to cooperate to improve CH4 production efficiency. Digested liquid and digested liquid supernatant were considered to be readily available fertilizer because they contain large amounts of ammoniac nitrogen and potassium. Digested liquid supernatant is easier to handle because suspended solids are removed from the digested liquid.
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