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Anaerobic digestion performance of sweet potato vine and animal manure under wet semi-dry and dry conditions

机译：湿半干和干燥条件下甘薯藤和动物粪便的厌氧消化性能

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Sweet potato vine (SPV) is an abundant agricultural waste, which is easy to obtain at low cost and has the potential to produce clean energy via anaerobic digestion (AD). The main objectives of this study were to reveal methane production and process stability of SPV and the mixtures with animal manure under various total solid conditions, to verify synergetic effect in co-digestion of SPV and manure in AD systems, and to determine the kinetics characteristics during the full AD process. The results showed that SPV was desirable feedstock for AD with 200.22 mL/g VSadded of methane yield in wet anaerobic digestion and 12.20 Lmethane/Lworking volume in dry anaerobic digestion (D-AD). Synergistic effects were found in semi-dry anaerobic digestion and D-AD with each two mixing feedstock. In contrast with SPV mono-digestion, co-digestion with manure increased methane yield within the range of 14.34–49.11% in different AD digesters. The values of final volatile fatty acids to total alkalinity (TA) were below 0.4 and the values of final pH were within the range of 7.4–8.2 in all the reactors, which supported a positive relationship between carbohydrate hydrolysis and methanogenesis during AD process. The mathematical modified first order model was applied to estimate substrate biodegradability and methane production potential well with conversion constant ranged from 0.0003 to 0.0953 1/day, which indicated that co-digestion increased hydrolysis efficiency and metabolic activity. This work provides useful information to improve the utilization and stability of digestion using SPV and livestock or poultry manure as substrates.
机译：甘薯藤（SPV）是一种农业废料，很容易以低成本获得，并具有通过厌氧消化（AD）产生清洁能源的潜力。这项研究的主要目的是揭示在各种总固体条件下SPV以及甲烷与动物粪便的混合物的甲烷生产和工艺稳定性，以验证AD系统中SPV和粪便共同消化的协同作用，并确定动力学特征。在整个广告过程中。结果表明，SPV是AD的理想原料，在湿式厌氧消化中添加200.22 mL / g VS的甲烷产量，在干式厌氧消化（D-AD）中添加12.20 L / L的工作量。在每两种混合原料的半干厌氧消化和D-AD中发现了协同作用。与SPV单消化相比，在不同的AD消化器中，与粪肥共消化在14.34–49.11％的范围内提高了甲烷产量。在所有反应器中，最终挥发性脂肪酸相对于总碱度（TA）的值均低于0.4，且最终pH值在7.4–8.2的范围内，这支持了AD过程中碳水化合物水解与甲烷生成之间的正相关关系。应用数学修正的一阶模型很好地估计了底物的生物降解性和甲烷生产潜力，其转化常数为0.0003至0.0953 1 /天，表明共消化提高了水解效率和代谢活性。这项工作提供了有用的信息，以提高以SPV和牲畜或家禽粪便为底物的消化的利用率和稳定性。

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