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首页> 美国卫生研究院文献>Microbial Biotechnology >Assessing the potential for up‐cycling recovered resources from anaerobic digestion through microbial protein production
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Assessing the potential for up‐cycling recovered resources from anaerobic digestion through microbial protein production

机译：通过微生物蛋白质生产评估从厌氧消化中回收资源的潜力

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Anaerobic digesters produce biogas, a mixture of predominantly CH4 and CO2, which is typically incinerated to recover electrical and/or thermal energy. In a context of circular economy, the CH4 and CO2 could be used as chemical feedstock in combination with ammonium from the digestate. Their combination into protein‐rich bacterial, used as animal feed additive, could contribute to the ever growing global demand for nutritive protein sources and improve the overall nitrogen efficiency of the current agro‐ feed/food chain. In this concept, renewable CH4 and H2 can serve as carbon‐neutral energy sources for the production of protein‐rich cellular biomass, while assimilating and upgrading recovered ammonia from the digestate. This study evaluated the potential of producing sustainable high‐quality protein additives in a decentralized way through coupling anaerobic digestion and microbial protein production using methanotrophic and hydrogenotrophic bacteria in an on‐farm bioreactor. We show that a practical case digester handling liquid piggery manure, of which the energy content is supplemented for 30% with co‐substrates, provides sufficient biogas to allow the subsequent microbial protein as feed production for about 37% of the number of pigs from which the manure was derived. Overall, producing microbial protein on the farm from available methane and ammonia liberated by anaerobic digesters treating manure appears economically and technically feasible within the current range of market prices existing for high‐quality protein. The case of producing biomethane for grid injection and upgrading the CO2 with electrolytic hydrogen to microbial protein by means of hydrogen‐oxidizing bacteria was also examined but found less attractive at the current production prices of renewable hydrogen. Our calculations show that this route is only of commercial interest if the protein value equals the value of high‐value protein additives like fishmeal and if the avoided costs for nutrient removal from the digestate are taken into consideration.
机译：厌氧消化器产生沼气，主要是CH4和CO 2的混合物，其通常焚烧以回收电气和/或热能。在循环经济的背景下，CH 4和CO 2可以用作来自消化物的铵的化学原料。它们与富含蛋白质的细菌组合，用作动物饲料添加剂，可以有助于不断增长的全球对营养蛋白质来源的需求，并提高目前农产品/食物链的整体氮效率。在这种概念中，可再生CH4和H2可以用作生产富含蛋白质的细胞生物质的碳中性能源，同时从消化物中同时同化和升级回收的氨。本研究评估了通过在农场生物反应器中使用甲脂蛋白和氢养细菌偶联的厌氧消化和微生物蛋白质产生，以分散的方式产生可持续高质量蛋白添加剂的潜力。我们表明，一种实际的挖掘机处理液体猪肉粪便，其中能量含量用共衬底补充30％，提供足够的沼气，以允许随后的微生物蛋白为饲料产生约37％的猪数量粪肥是衍生的。总的来说，从可用的甲烷和由Anaerobic Digesters治疗粪便中释放的可用甲烷和氨的农场生产微生物蛋白在现有的高质量蛋白质的市场价格范围内经济和技术上可行。还研究了通过氧化细菌的制备用于网格注射的生物甲烷和用电解氢升高到微生物蛋白的CO 2的情况，但在可再生氢的目前生产价格上发现了更少的吸引力。我们的计算表明，如果蛋白质值等于鱼粉等高价值蛋白添加剂的价值，则该路线仅具有商业兴趣，并且考虑到从消化物中的避免成本从消化物中除去。

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