Optimization of micro-aeration intensity in acidogenic reactor of a two-phase anaerobic digester treating food waste

被引:122
作者
Xu, Suyun [1 ,2 ]
Selvam, Ammaiyappan [2 ]
Wong, Jonathan W. C. [2 ]
机构
[1] Univ Shanghai Sci & Technol, Dept Environm & Low Carbon Sci, Sch Environm & Architecture, Shanghai, Peoples R China
[2] Hong Kong Baptist Univ, Sinoforest Appl Res Ctr Pearl River Delta Environ, Dept Biol, Kowloon Tong, Hong Kong, Peoples R China
关键词
Micro-aeration; Acetic acid; Butyric acid; Methane production; Protein hydrolysis; MUNICIPAL SOLID-WASTE; FERMENTATIVE HYDROGEN; WATER; HYDROLYSIS; PH; MICROAERATION; INTERMITTENT; LANDFILL; FRACTION; METHANE;
D O I
10.1016/j.wasman.2013.10.038
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Micro-aeration is known to promote the activities of hydrolytic exo-enzymes and used as a strategy to improve the hydrolysis of particulate substrate. The effect of different micro-aeration rates, 0, 129, 258, and 387 L-air/kg TS/d (denoted as LBR-AN, LBR-6h, LBR-3h and LBR-2h, respectively) on the solubilization of food waste was evaluated at 35 degrees C in four leach bed reactors (LBR) coupled with methanogenic upflow anaerobic sludge blanket (UASB) reactor. Results indicate that the intensity of micro-aeration influenced the hydrolysis and methane yield. Adequate micro-aeration intensity in LBR-3h and LBR-2h significantly enhanced the carbohydrate and protein hydrolysis by 21-27% and 38-64% respectively. Due to the accelerated acidogenesis, more than 3-fold of acetic acid and butyric acid were produced in LBR-3h as compared to the anaerobic treatment LBR-AN resulting in the maximum methane yield of 0.27 L cH4/g VSadded in the UASB. The performance of LBR-6h with inadequate aeration was similar to that of LBR-AN with a comparable hydrolysis degree. Nevertheless, higher aeration intensity in LBR-2h was also unfavorable for methane yield due to significant biomass generation and CO2 respiration of up to 18.5% and 32.8% of the total soluble hydrolysate, respectively. To conclude, appropriate micro-aeration rate can promote the hydrolysis of solid organic waste and methane yield without undesirable carbon loss and an aeration intensity of 258 L-air/kg TS/d is recommended for acidogenic LBR treating food waste. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:363 / 369
页数:7
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