Batch mesophilic anaerobic co-digestion of spent goat batch mesophilic anaerobic co-digestion of spent goat straw bedding and goat cheese whey: Comparison with the mono-digestion of the two sole substrates

Spent livestock bedding is a valuable resource for the production of green energy (methane) in rural areas. Comparison and evaluation batch anaerobic digestion co-digestion different mixtures goat straw (SGSB) cheese whey were carried out. Biochemical methane potential (BMP) tests 100% SGSB, 95% SGSB-5% whey, 90% SGSB-10% 85% SGSB-15% found to be 423 ± 7, 354 9, 371 2, 293 1, 274 2 mL CH4 g?1 VS. Two kinetic models evaluated. The logistic model revealed decrease maximum rate (Rm) from 34.7 1.5 14.1 0.9 VS·d?1 when percentage mixture increased 0 15% as consequence ammonia released during concentrations whey. lowest value predicted by (P) was (274 10 VS). A two-substrate applied describe evident existence rapid slowly degradable material. Regarding hydrolysis constants this model, considerable increases biodegradation stage (krapid) observed comparing values slow (kslow) all cases tested. between both rose 5 42% increased.