Carbon sequestration effect and economic benefit evaluation of light-dark combined fermentation based microalgae biological hydrogen production
Microalgae energy is the most potential third-generation biomass energy.Applying the microalgae generated from waste treatment to hydrogen production can enhance the resource utilization of waste while improving the economic and environmental benefits of biological hydrogen production.In order to optimize the microalgae biological hydrogen production mode and improve the production efficiency,this paper carries out microalgae biological hydrogen production by combining light fermentation with dark fermentation,based on the scenario of photovoltaic energy supply.Then,the hydrogen production and carbon sequestration and emission reduction effects of microalgae at different light-dark combinations are analyzed.Finally,the economic benefit of waste treatment and the production potential of biological hydrogen production are calculated.And the following research results are obtained.First,the light-fermentation hydrogen production exhibits better carbon sequestration and emission reduction effects.To produce 1 kg of hydrogen,the carbon sequestration and emission reduction through light fermentation amounts to 0.89 kg of CO2,surpassing dark fermentation by 0.46 kg of CO2.Second,the dark-fermentation hydrogen production is better in economic benefit.To produce 1 kg of hydrogen,the economic benefit through dark fermentation is CNY 61.56,surpassing light fermentation by CNY 61.01.Third,the combination of light fermentation and dark fermentation allows for the production of 41.23 kg of hydrogen,the carbon sequestration and emission reduction of 54.61 kg of CO2 and the economic benefit of CNY 2 560.52 in a single cycle.In conclusion,the light-dark combined fermentation based hydrogen production with TP5(autotrophic time:7 d,heterotrophic time:9 d,and ultimate microalgae concentration:54 g/L)cyclic microalgae proliferation rate achieves carbon sequestration and emission reduction and economic benefit simultaneously,and compared with other combinations,it has a better production effect and is more suitable for large-scale production expansion.What's more,the light-dark fermentation based hydrogen production is on the basis of microalgae proliferation,so the hydrogen production environment shall be optimized according to the characteristics of algae,and the hydrogen production proportions and modes shall be adjusted,so as to strengthen the development of microalgae biomass energy and expand the development prospect of microalgae biological hydrogen production.
MicroalgaeLight-dark fermentationBiological hydrogen productionEnergyCarbon sequestration and emission reductionEconomic benefitWaste disposal
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