Mesophilic temperature range effect on anaerobic digestion of residential grass cuttings using simple batch digester Online publication date: Wed, 03-Jan-2018
by Ishmael M. Ramatsa; Esther T. Akinlabi; Robert Huberts
International Journal of Renewable Energy Technology (IJRET), Vol. 8, No. 3/4, 2017
Abstract: In the current study the main objective was to look into how the temperature and other resulting parameters impact on the stability of a biogas reactor during digestion of the residential grass cuttings in an oxygen deficient environment over a period of ten days. During this period of digestion ammonia nitrogen was found to be below inhibitory limits. N/C ratio of the grass was found to be 20.54 and total solids about 87.88%. pH levels for temperatures close to optimum fluctuated between 6.99 and 7.2. Concentration of ammonia nitrogen recorded for all temperatures were all below inhibiting range. A high constant acetic acid concentration was recorded for 40°C, indicating that metanogenesis was stopped, causing a cessation of biogas production. This was accompanied by a low pH level. The highest daily methane compositions produced during the digestion at the temperature of 32, 34, 36 38 and 40°C were 49, 52, 56.2, 53 and 26% respectively.
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