Potential Greenhouse Gas Mitigation from Utilising Pig Manure and Grass for Hydrothermal Carbonisation and Anaerobic Digestion in the UK, EU, and China
Potential Greenhouse Gas Mitigation from Utilising Pig Manure and Grass for Hydrothermal Carbonisation and Anaerobic Digestion in the UK, EU, and China
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DOI：
10.3390/agriculture13020479
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发表时间：
2023-02
期刊：
影响因子：
--
通讯作者：
Nicholas Davison;Aaron E. Brown;A. Ross
中科院分区：
文献类型：
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作者：
Nicholas Davison;Aaron E. Brown;A. Ross
目前，猪粪便在储存和传播到土地的过程中会导致相当大的温室气体排放。厌氧消化和水热碳化可以提供显着的温室气体减排，以及产生可再生的热量和电力（厌氧消化），或类似泥炭的土壤改良产品（水热碳化）。本文确定了与避免英国、欧盟和中国的猪粪储存和传播相关的温室气体减排潜力，以及通过厌氧消化和水热碳化提供热量和电力的潜力。在每种情况下，将猪粪的单一转化与猪粪与草的50：50混合物的共转化进行比较。在所有情况下，厌氧消化比水热碳化显示出更大的温室气体减排潜力，与草共处理大大提高了温室气体减排潜力。中国的温室气体减排潜力最大（1.29亿吨CO2当量），每千克猪粪的减排量最大（1.8千克CO2/千克猪粪挥发性固体）。能源网碳强度对不同区域不同方法的温室气体减排潜力有显著影响。中国大量产生猪粪，沼气产生的能量抵消了较高的碳强度电网。通过计算，猪粪和草厌氧消化产生的温室气体减排量在中国（1.05%）、欧盟（0.92%）和英国（0.19%）的温室气体总排放量中具有显著的减排潜力。总的来说，利用猪粪可以带来大量的温室气体减排，特别是通过在拥有大型养猪业和碳密集型能源混合的国家将猪粪与草共同消化。
Pig manure currently results in sizeable greenhouse gas emissions, during storage and spreading to land. Anaerobic digestion and hydrothermal carbonisation could provide significant greenhouse gas mitigation, as well as generate renewable heat and power (with anaerobic digestion), or a peat-like soil amendment product (with hydrothermal carbonisation). The greenhouse gas mitigation potential associated with avoidance of pig manure storage and spreading in the UK, EU, and China, as well as the potential to provide heat and power by anaerobic digestion and soil amendment products by hydrothermal carbonisation was herein determined. In each case, the mono-conversion of pig manure is compared to co-conversion with a 50:50 mixture of pig manure with grass. Anaerobic digestion displayed a greater greenhouse gas mitigation potential than hydrothermal carbonisation in all cases, and co-processing with grass greatly enhances greenhouse gas mitigation potential. China has the largest greenhouse gas mitigation potential (129 MT CO2 eq), and greatest mitigation per kg of pig manure (1.8 kgCO2/kg pig manure volatile solids). The energy grid carbon intensity has a significant impact on the greenhouse gas mitigation potential of the different approaches in the different regions. Pig manure is generated in large amounts in China, and the energy generated from biogas offsets a higher carbon intensity grid. Greenhouse gas savings from the anaerobic digestion of pig manure and grass have been calculated to provide a significant potential for reducing total greenhouse gas emissions representation in China (1.05%), the EU (0.92%), and the UK (0.19%). Overall, the utilisation of pig manure could bring about substantial greenhouse savings, especially through co-digestion of pig manure with grass in countries with large pig farming industries and carbon intense energy mixes.