Biogas generation through co-digestion of jatropha seed cake, husk, and cow dung for biomethane potential assessment
DOI:
https://doi.org/10.35208/ert.1717454Keywords:
Jatropha straw, Jatropha seed cake, cow dung, biogas productionAbstract
Much biogas comes from agricultural and agro-industrial waste in places where farming is very important. This research explored how biogas can be generated from Jatropha seed cake (JSC), Jatropha straw (JS) and cow dung (CD) by altering (Total Solids) TS contents and C:N ratios in batch digesters. Fifteen glass jars (1000 mL capacity each) were used as batch digesters for a Hydraulic Retention Time (HRT) of 41 days at 32°C. In total, five reactors were installed: Reactor 1 (6% TS JSC), Reactor 2 (6%TS JS), Reactor 3 (4% TS JSC + 2% TS JS), Reactor 4 (4% TS JSC + 2% TS CD) and Reactor 5 (4% TS JS + 2% TS CD). A liquid displacement method measured biogas production daily and gas composition was examined each day using a 7820A gas chromatograph. The highest biogas yield was 340 mL/g Volatile Solids (VS) from Reactor 1 which also had 62.5% methane, while Reactor 4 had 310 mL/g VS and a methane content of 58.3%. Reactor 5 gave the smallest yield, recording only 180 mL/g VS. The pH of JSC slurry (6.2–6.96) supported methanogens well, but both JS and CD slurries had pHs below 6.96 (5.9 and 5.5–6.4, respectively). More than six in ten ions (62%) were removed in Reactor 1 and the levels of NH3-N were generally low, except in Reactor 2 at 480 mg/L. Study creates global framework for co-digestion of agro-wastes, boosts biogas yield, mitigates toxicity, advances sustainable energy.
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