One setback of mono-digestion for biogas production is low methane (CH4) content, the core
energy calorific value. Catalyst and nutrient supplementation are the option to improve biogas
both in quantity and quality by reducing carbon dioxide (CO2) back to methane (CH4). Using
CSTRs, this study attempted to enhance bio-methane from cassava pulp and its wastewater by
readily available reducing agent, Zero Valent Iron, Fe0 (ZVI). M100 iron in micromillimeter
size particle was verified and characterized by synchrotron lights (XPS) whether it is in state of
valency 0 for optimum reactional kinetic. Introduced ZVI in 0-0.25-0.5-1-2 g/L dosage, it was
discovered that 1 g/L ZVI microparticle concentration resulted maximized SCOD removal (up to
95%) generating biogas for 900 ml/day/OLR with highest methane content (85%). Although the
presence of ZVI is stimulatory, inhibition started when iron concentration exceeds 1 g/L ending
digestion failure by iron toxicity after 5 days along comparative study for 30 days HRT. Meanwhile,
the performance of CSTRs in remaining doses functioned stably among which ZVI microparticle
in 1 g/L supplemented CSTR processed in ideal bio-methanation. This study inspires the possibility
of enriching more bio-methane by cutting hefty cost and chemicals consumption in subsequent
gas upgrading processes.
Keywords
biogas, cassava pulp, microparticle, ZVI, CSTR.
ENIVRONMENT ASIA
Published by : Thai Society of Higher Education Institutes on Environment Contributions welcome at : http://www.tshe.org/en/
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