微生物燃料电池回收氨氮合成微生物蛋白研究

Microbial protein production by using nitrogen extracted from microbial fuel cells

基于微生物燃料电池(MFC)对有机废水中的氨氮进行回收,回收效率可达41.3%,同时产生95.5J的电能;在MFC体系中,氨氮迁移规律符合Levenberg-Marquardt方程(R^(2)>0.95).进一步将回收的氨氮协同CO_(2)通过氢氧化细菌合成微生物蛋白,固碳效率为1.1LCO_(2)/(L·d),细胞干重产量为2.41g/L,蛋白质含量为49.4%,氨基酸的产量为1.19g/L.本实验产出的微生物蛋白的氨基酸含量高于斑鰶鱼,氨基酸种类多于市场植物蛋白饲料,具有较强的市场竞争力和实际应用潜力.本系统可协同转化CO_(2)和氨氮合成蛋白,提供绿色可持续的蛋白供应源,助力实现碳中和的目标,对有机废水资源化利用产生积极的推动作用.

In this experiment,ammonium nitrogen in organic wastewater was recovered via microbial fuel cell(MFC).In MFC system,the recovery efficiency of ammonium nitrogen could reach 41.3%,along with electric energy of about 95.5J.The migration tendency of ammonium nitrogen matched well with Levenberg-Marquardt equation(R^(2)>0.95).Subsequently,microbial protein(MP)was synthesized by hydrogen oxidizing bacteria(HOB),using CO_(2)and the extracted nitrogen from MFC.The CO_(2)sequestration rate was about 1.1LCO_(2)/(L·d)and dry cell weight in HOB system was 2.41g/L.The protein content was 49.4%,and the production of amino acids was 1.19g/L.The amino acid content of MP produced in this experiment was higher than that of the Clupanodom punchtatus.Also,the amino acid species were more abundant than that of the plant protein feeds.Thus,MP performs the potential on market competitiveness and practical application.In this experiment,CO_(2)and nitrogen from wastes could be used for providing green and sustainable protein supply source,which played a positive role in promoting the resource utilization of organic wastewater.