110 / 2023-07-20 20:51:19

Biohydrogen production from recycle fermentative residue: A roadmap to sustainable development though zero waste production

Biofules; fermentation; biomass,biochar,catalytic pyrolysis,Biohydrogen

To overcome energy security and climate change issues researchers are finding ways for efficient conversion of bio resources to harvest their full potential. Currently, fermentation is the most economical and environment friendly option to convert biomass to hydrogen. Along with large amount of fermentative bioH₂ production it gives fermentative residues (FRs) as byproduct which considered as waste management issue. Normally, these FRs are burned, composted, dumped or used inefficiently due to the lack of knowledge and absence of sustainable and cheaper conversion methods. This study dealt with this issue and gave most economical and environment friendly route to harvest maximum potential of these waste considering FRs. In 1^st fermentation run maximum conversion of corn stover sugars into biohydrogen 33.6 ml/g CS was take placed and further no hydrogen production observed after 72 hrs. For maximum resource harvesting these fermentative residues are washed and overnight dried then again fermented and surprisingly they gave satisfactory results 31.09 ml H₂/gFR₁ and same procedure revised and in 3^rd run fermentation process observed a sharp decline in hydrogen yield 5.31 ml H₂/gFR₂ which shows almost all sugars are converted into hydrogen. This hypothesis then confirmed with FTIR and TG analysis which shows the presence of extra peak of double carbonyl bond (O=C=O) at 2300-2400 in FTIR also temperature shift of 10-20 °C in DTGA curve pattern shows a strong bonded material is left in FRs which is further confirm the GC measurement which showed that CO₂ concentrations increases with FR. The leftover residue is thermochemically cracked to bio-oil along with biochar production which has potential applications in energy storage, environmental remediation, and waste water treatment etc.