Simultaneous production of biomethane and food grade CO2 from biogas: an industrial case study†,Energy & Environmental Science

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Simultaneous production of biomethane and food grade CO2 from biogas: an industrial case study†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-11-21 00:00:00 , DOI: 10.1039/c8ee02897d
Elisa Esposito _{1,

2,

3,

4} , Loredana Dellamuzia _{4,

5,

6} , Ugo Moretti _{4,

5,

6} , Alessio Fuoco _{1,

2,

3,

4} , Lidietta Giorno _{1,

2,

3,

4} , Johannes C. Jansen _{1,

2,

3,

4}

Affiliation

This work presents a case study on the first large-scale industrial biogas upgrading process with simultaneous purification of methane and CO₂ in one of Europe's largest biogas production and purification plants in Northern Italy. A preliminary study was performed on a pilot plant, constructed as a model of the industrial plant where the final experiments were performed. The full-scale anaerobic digestion plant has a digestive capacity of 400 000 tonnes of biomass per year and it can treat 6250 m³ h⁻¹ of biogas. The first objective was a biogas upgrading process that achieves distribution grid-quality methane via different purification steps. The second objective and most innovative aspect is the further purification of CO₂ from a useless waste product to a high purity gas for the food and beverage industry. The chemical purity of different process streams was analysed by a certified laboratory and was compared with the guidelines of the European Industrial Gas Association and International Society of Beverage Technologists (EIGA/ISBT) for CO₂ used in the food industry. The microbiological purity was found to be far below the limit values defined in the European Collaborative Action. With a purity of 96.3 vol%, methane respects the purity requirement for the household network. With a purity of 98.1 vol% before, and 99.9 vol% after the final distillation process, CO₂ proves to be chemically and microbiologically suitable for food applications, thus closing the CO₂ loop in biogas production. An evaluation of the economic and energetic aspects and a comparison with alternative purification processes highlights the profitability of the process.

中文翻译：

同时利用沼气生产生物甲烷和食品级CO ₂：工业案例研究†

这项工作提供了一个案例研究，该案例是在意大利北部欧洲最大的沼气生产和净化工厂之一中，同时净化甲烷和CO ₂的首个大规模工业沼气提纯工艺。对中试工厂进行了初步研究，该工厂被构建为进行最终实验的工业工厂的模型。大型厌氧消化厂每年的消化能力为40万吨生物质，可处理6250 m ³ h ^-1的沼气。第一个目标是沼气提纯工艺，该工艺可通过不同的纯化步骤获得配气网状甲烷。第二个目标也是最具创新性的方面是进一步纯化一氧化碳₂从无用的废物到食品和饮料行业的高纯度气体。由认证实验室对不同工艺流程的化学纯度进行了分析，并与欧洲工业气体协会和国际饮料技术专家协会（EIGA / ISBT）针对食品工业中使用的CO₂的指南进行了比较。发现微生物纯度远低于欧洲合作行动中规定的极限值。甲烷的纯度为96.3％（体积），符合家用网络的纯度要求。最终蒸馏过程之前的纯度为98.1体积％，最终蒸馏后的纯度为99.9体积％，事实证明CO₂在化学和微生物学上适用于食品，因此可以封闭CO₂沼气生产中的循环。对经济和能源方面的评估以及与其他提纯工艺的比较突出了该工艺的盈利能力。

更新日期：2018-11-21

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