微藻光—暗联合发酵制氢固碳效果及经济效益评价

Carbon sequestration effect and economic benefit evaluation of light-dark combined fermentation based microalgae biological hydrogen production

微藻能源是最具潜力的第三代生物质能源,将废物处理的微藻用于制氢,能够在增强废物资源化利用的同时提升生物制氢的经济效益与环境效益。为优化微藻生物制氢的方式并提升生产效益,基于光伏供能情境,采用光—暗发酵相结合的方式进行了微藻生物氢的制取,并分析了不同光—暗联合下微藻的制氢效果和固碳减排效果,最后核算了废物处理产生的经济效益和生物制氢的生产潜力。研究结果表明:①微藻光发酵制氢具有较好的固碳减排效果,每生产1 kg氢气,光发酵的固碳减排量为0.89 kgCO_(2),相较于暗发酵高0.46 kgCO_(2);②暗发酵制氢具有较好的经济效益,每生产1 kg氢气,暗发酵制氢的经济效益为61.56元,相较于光发酵高61.01元;③将光—暗发酵相结合,单个周期可生产41.23 kg氢气,实现固碳减排54.61 kgCO_(2),产生经济效益为2560.52元。结论认为:①采用TP5类(自养时间7 d、异养时间9 d,微藻最终浓度为54 g/L)周期下微藻增殖量进行的光—暗发酵制氢,实现了固碳减排与经济效益并存,相比于其他组合具有更好的生产效果,更适合用于规模化扩大生产;②光—暗发酵联合制氢是基于微藻增殖所进行的,应依据藻种特性优化制氢环境,对制氢比例与制氢方式做出调整,以加强微藻生物质能源开发,不断扩展微藻生物制氢的发展前景。

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 lightfermentation 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 CO_(2),surpassing dark fermentation by 0.46 kg of CO_(2).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 CO_(2)and the economic benefit of CNY 2560.52 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.