The Influence of Organic Loading Rates on Hydrolysis and Acidification Rates of Fruit and Vegetable Waste Anaerobic Fermentation

Abstract:

Continuous flow anaerobic fermentation experiments of fruit and vegetable waste were carried out in four laboratory-scale anaerobic acidification reactors with pH controlling system. The organic loading rate (OLR) were 13, 20, 30 kg COD/m³ d gradually and a hydraulic retention time (HRT) of 3 days were constantly. The results, obtained from the three stages operation, showed that hydrolysis rate increased along with the rising of OLR, to the highest of 79.3%, and acidification rate decreased on the contrary, showing that the activity of acidification bacteria was inhibited by high OLR. High pH value contributed to the process of hydrolysis and acidification especially under high OLR in the acidogenic phase of the fruit and vegetable waste.

• Periodical: Advanced Materials Research (Volumes 779-780)
• Pages: 1242-1245
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.779-780.1242
• Online since: September 2013
• Authors: Dan Han, Ming Yue Zheng, Ming Xia Zheng, Qun Hui Wang, Kai Jun Wang
• Keywords: Acidification Rate, Fruit Waste, Hydrolysis Rate, OLR, Vegetable Waste

References

[1] SHI Hong-zuan, ZHANG Bo, CAI Wei-min. Effects of Acidity on Fermentation of Kitchen Wastes[J]. Journal of Agro-Environment Science. 2005(04): 809-811.

[2] HE Pin-jing, PAN Xiu-jiang, LU Fan, et al. The influence of pH value on anaerobic hydrolysis and acidification rates of biodergradable organic waste[J]. China Environmental Science. 2006(1): 57-61.

[3] LI Yang, DUAN Xiao-rui, YUAN Hong-ying, et al. Effect of pH on Anaerobic Acidification of Excess Sludge[J]. China Water & Wastew Ater. 2010(17): 8-11.

[4] ZHANG Bo, SHI Hongzuan, ZHANG Lili, et al. The influence of pH on hydrolysis and acidification of kitchen wastes in two-phase anaerobic digestion[J]. Acta Scientiae Circumstantiae. 2005(05): 665-669.

[5] ZHENG Ming-yue, ZHENG Ming-xia, WANG Kai-jun, et al. Effect of t emperature, pH and OLR on anaerobic acidification pathway of fruit and vegetable waste[J]. Renewable Energy Resources. 2012(04): 75-79.

[6] REN Nan-qi, WANG Ai-jie, MA-Fang. Physiological Ecology of Acidogens in Anaerobic Biotreatment Process. Science Press. (2005).

[7] GAO Yong-qing, ZHANG Jing-yu, PENG Yong-zhen, et al. The Characteristics of Activated Sludge Hydrolysis and Acidification Products at Different pH [J]. Journal of Beijing University of Technology. 2011(01): 139-145.

[8] BAO Lixin, LI Jian-zheng, LIU Qian-liang, et al. Effect of OLR on continuous flow anaerobic activated sludge fermentation system for bio-hydrogen production[J]. Journal of Harbin Institute of Technology. 2007(08): 1266-1269.

[9] Babel S, Fukushi K, Sitanrassamee B. Effect of acid speciat ion on solid waste liquefaction in anaerobic acid digest er[J] . Water Research, 2004, 38: 2417-2423.

DOI: 10.1016/j.watres.2004.02.005