Abstract
The burgeoning organic waste and continuously increasing energy demands have resulted in significant environmental pollution concerns. To address this issue, the potential of different bacteria to produce biogas/biohydrogen from organic waste can be utilized as a source of renewable energy, however these pathogenic bacteria are not safe to use without strict contact isolation. In this study the role of safe food grade lactic acid bacteria (Lactobacillus spp.) was investigated for production of biogas from cheese waste with starting hexose concentration 32 g/L. The bacterium Lactobacillus acidophilus was identified as one of the major biogas producers at optimum pH of 6.5. Further the optimum inoculum conditions were found to be 12.5% at inoculum age of 18 h. During the investigation the maximum biogas production was observed to be 1665 mL after 72 hours of incubation at pH 6.5. The biogas production was accompanied with production of other valuable metabolites in the form of organic acids including pyruvate, propionate, acetate, lactate, formate and butyrate. Thus this research is paving way for nonpathogenic production of biohydrogen from food waste.
Highlights
Exhaustion of conventional energy reserves, global warming and elevated environmental pollution have necessitated the utilization of alternative energy sources[1,2]
In comparison to the lipid, protein and cellulose components, the carbohydrate fraction in food waste plays a significant role in the hydrolysis step during anaerobic degradation
In present study the role of Lactobacillus was observed for biogas production in fed batch reactor using anaerobic fermentation
Summary
Exhaustion of conventional energy reserves, global warming and elevated environmental pollution have necessitated the utilization of alternative energy sources[1,2]. The utmost challenge today is the substitution of conventional fuels with renewable and carbon neutral energy sources. The wasted food can be utilised, along with other combustible municipal wastes, for energy production Despite this relatively simple means to harness energy from waste, combustion of food waste results in air pollution and loss of chemical values of organic materials. Hydrogen is regarded as a substitute energy carrier owing to its greater energy yield (122 kJ/g) i.e. 2.75 times higher than that of common hydrocarbon based fuels and non-polluting emissions. Hydrogen gas exerts an important position due to its noncarcinogenic character resulting in cleaner and sustainable energy system. It can be produced from fossil fuels or any other source which is carbon free leading to reduce the emission of greenhouse gases[14]. More than 90% of hydrogen production worldwide is being executed www.nature.com/scientificreports/
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