Zhang Enlan, Li Jiajia, Zhang Keqiang, Wang Feng, Yang Houhua, Zhi Suli, Liu Guangqing
Biomass Energy and Environmental Engineering Research Center, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Innovation Team of Animal Husbandry Pollution Prevention and Control, Agro-Environmental Protection Institute, Chinese Academy of Agricultural Sciences, 504 Zonghe Building, No.31 Fukang Road, Nankai District, Tianjin, 300191, People's Republic of China.
AMB Express. 2018 Mar 22;8(1):45. doi: 10.1186/s13568-018-0572-9.
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 VS of methane yield in wet anaerobic digestion and 12.20 L/L 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.
甘薯藤（SPV）是一种丰富的农业废弃物，易于低成本获取，并且具有通过厌氧消化（AD）生产清洁能源的潜力。本研究的主要目的是揭示在不同总固体条件下，SPV以及与动物粪便混合物的甲烷产量和过程稳定性，验证AD系统中SPV与粪便共消化的协同效应，并确定整个AD过程中的动力学特征。结果表明，SPV是AD的理想原料，湿式厌氧消化中甲烷产量为200.22 mL/g VS，干式厌氧消化（D-AD）中为12.20 L/L。在半干式厌氧消化和D-AD中，每两种混合原料都发现了协同效应。与SPV单消化相比，在不同的AD消化器中，与粪便共消化使甲烷产量提高了14.34-49.11%。所有反应器中最终挥发性脂肪酸与总碱度（TA）的值均低于0.4，最终pH值在7.4-8.2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。应用数学修正的一级模型能够很好地估计底物生物降解性和甲烷生产潜力，转化常数范围为0.0003至0.0953 1/天，这表明共消化提高了水解效率和代谢活性。这项工作为提高以SPV和畜禽粪便为底物的消化利用和稳定性提供了有用信息。
