In this study, an innovative integrated two-stage (ITS) anaerobic bioreactor was designed and constructed in pilot scale. The integrated reactor used the dual-cylinder configuration to separate the acidogenic stage in inner cylinder with the methanogenic stage in outer cylinder. The reactor was operated for 184days treating food waste with elevated organic loading rates (OLR). The ITS reactor showed high efficiency and stability. In the stable operation phases, the organic load was 3.0kgVS/(m3·d), volumetric gas production rate reached an average of 1.69m3/(m3·d), and highest value is up to 2.72m3/(m3·d); the gas production rate was 0.57m3/(kgVS·d), and the organic solids removal rate was 77.2%. Due to phase separation effect, pH value of outer cylinder was about 0.3~0.4unit higher than that of inner cylinder, the average volatile fatty acids (VFAs) and soluble chemical oxygen demand (sCOD) concentration of outer cylinder was 25% and 23% lower than that of inner cylinder, respectively. The integrated two-stage (ITS) anaerobic reactor realized the separation of acidogenic and methanogenic phases in one reactor. The inner acidogenic phase performed the hydrolysis and acidogenic steps and reduces the impact of acid accumulation on the outer methanogenic phase, which played a key role in the stable operation of the reactor.
史绪川, 左剑恶, 阎中, 甘海南, 王凯军. 新型两相一体厌氧消化反应器处理餐厨垃圾中试研究[J]. 中国环境科学, 2018, 38(9): 3447-3454.
SHI Xu-chuan, ZUO Jian-e, YAN Zhong, GAN Hai-nan, WANG Kai-jun. A pilot study on integrated two-stage anaerobic digestion of food waste in an innovative dual-cylinder reactor. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3447-3454.
Zhang C, Su H, Baeyens J, et al. Reviewing the anaerobic digestion of food waste for biogas production[J]. Renewable and Sustainable Energy Reviews, 2014,38:383-392.
[4]
Capson-Tojo G, Rouez M, Crest M, et al. Food waste valorization via anaerobic processes:a review[J]. Reviews in Environmental Science and Bio/Technology, 2016,15(3):499-547.
[5]
Li L, Peng X, Wang X, et al. Anaerobic digestion of food waste:A review focusing on process stability[J]. Bioresource Technology, 2017,248:20-28.
[6]
Chen Y, Cheng J J, Creamer K S. Inhibition of anaerobic digestion process:A review[J]. Bioresource Technology, 2008,99(10):4044-4064.
[7]
Shi X, Lin J, Zuo J, et al. Effects of free ammonia on volatile fatty acid accumulation and process performance in the anaerobic digestion of two typical bio-wastes[J]. Journal of Environmental Sciences, 2017, 55:49-57.
[8]
Yuan H, Zhu N. Progress in inhibition mechanisms and process control of intermediates and by-products in sewage sludge anaerobic digestion[J]. Renewable and Sustainable Energy Reviews, 2016,58:429-438.
Lin J, Zuo J, Gan L, et al. Effects of mixture ratio on anaerobic co-digestion with fruit and vegetable waste and food waste of China. Journal of Environmental Sciences, 2011,23(8):1403-1408.
Wang J Y, Zhang H, Stabnikova O, et al. Comparison of lab-scale and pilot-scale hybrid anaerobic solid-liquid systems operated in batch and semi-continuous modes[J]. Process Biochemistry, 2005,40(11):3580-3586.
[26]
De Gioannis G, Muntoni A, Polettini A, et al. Energy recovery from one-and two-stage anaerobic digestion of food waste[J]. Waste Management, 2017,68:595-602.