李倩1,
许曼娟1,
王晓昌1
1.西安建筑科技大学环境与市政工程学院,西安 710055
基金项目: 国家自然科学基金资助项目(51608430)
中国博士后科学基金资助项目(2016M602781)
陕西省教育厅重点实验室项目(17JS077)
Effect of feeding frequency on stability of mesophilic co-digestion of food waste and waste activated sludge
ZHANG Nianrui1,,LI Qian1,
XU Manjuan1,
WANG Xiaochang1
1.School of Environmental & Municipal Engineering, Xi′an University of Architecture & Technology, Xi′an 710055,China
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摘要:考察系统负荷(以COD计)为11.36 g·(L·d)-1时,6种不同进料频率下,餐厨垃圾和剩余污泥中温厌氧共发酵过程中产气量、气体组分、SCOD、pH和挥发性脂肪酸(VFAs)的变化,旨在明确进料频率对系统稳定性的影响,同时结合单一VFA的产甲烷动力学特性,探明系统不稳定的原因。结果表明,进料频率较高时,进料周期内系统的气体组分、SCOD和pH无明显变化,产气量呈线性增长,且基本无VFA积累。随着进料频率降低,进料初期过快的水解酸化导致SCOD和VFAs浓度呈现明显的先升高后逐渐降低的趋势,从而导致pH和甲烷含量波动明显。当进料频率为1 次·d-1时,系统中pH降至7.5,甲烷含量降至45.4%,丙酸占总有机酸的比例最高可达87.9%。相比乙酸而言,丙酸在甲烷化过程中存在的延滞期(1.21 h)及较低的甲烷化速率(5.01 mL·h-1)可能是导致存在丙酸积累的低频进料系统中稳定性较差的原因之一。
关键词: 餐厨垃圾/
剩余污泥/
中温厌氧共发酵/
负荷冲击/
挥发性脂肪酸
Abstract:In order to know the effects of feeding frequency on stability of co-digestion of food waste and waste activated sludge, the variation of biogas production, biogas composition, SCOD, pH and VFAs were investigated at 6 different feeding frequency under OLR(calculated by COD) of 11.36 g·(L·d)-1. Meanwhile, the kinetic characteristics of methanogensis of individual VFA were also analyzed to know the reason for instable performance. Results showed that in a feeding period, the variation of gas composition, SCOD and pH were not significant, biogas production increased almost linearly without VFA accumulation at the high feeding frequency. With the decrease of feeding frequency, the fast hydrolysis and acidogenesis led to the increase of SCOD and VFAs concentration at the beginning of the feeding period, then gradually decreased, and resulted in the significant fluctuation of pH and methane percentage in biogas. At the feeding frequency of 1 d, pH declined to 7.5, the content of methane dropped to 45.4%. The concentration of propionic accounted for 87.9% of TVFA. Compared with acetate, the lag time (1.21 h) and lower rate (5.01 mL·h-1) of methanogenesis of propionate should be one reason for instable performance of low feeding frequency system.
Key words:food waste/
waste activated sludge/
mesophilic anaerobic co-digestion/
load shock/
volatile fatty acids.
| [1] | 马顺勤,矫伟,关春雨.城市固体废弃物综合处理产业园设计实例分析[J].广东化工,2015,2(4):76-77 |
| [2] | DAI X H,DUAN N N,DONG B, et al.High-solids anaerobic co-digestion of sewage sludge and food waste in comparison with mono digestions: Stability and performance[J].Waste Management, 2013,3(2):308-316 |
| [3] | KAWAI M, NAAGAO N,TAJIMA N, et al.The effect of the labile organic fraction in food waste and the substrate/inoculum ratio on anaerobic digestion for a reliable methane yield[J].Bioresource Technology,2014,7(1):174-180 |
| [4] | LI Q, LI H, WANG G J, et al.Effects of loading rate and temperature on anaerobic co-digestion of food waste and waste activated sludge in a high frequency feeding system,looking in particular at stability and efficiency[J].Bioresource Technology,2017,7:231-239 |
| [5] | LIU X, WANG W, SHI Y C, et al.Pilot-scale anaerobic co-digestion of municipal biomass waste and waste activated sludge in China: Effect of organic loading rate[J].Waste Management,2012,2:2056-2060 |
| [6] | GOU C L,YANG Z H,HUANG J,et al.Effects of temperature and organic loading rate on the performance and microbial community of anaerobic co-digestion of waste activated sludge and food waste[J].Chemosphere, 2014,5:146-151 |
| [7] | BOMBARDIERE J, ESPINOSA-SOLARES T, DOMASCHKO M, et al.Thermophilic anaerobic digester performance under different feed-loading frequency[J].Applied Biochemistry & Biotechnology,2007,7-140:765-775 |
| [8] | 王小伟,李文哲,罗立娜,等.补料频率对牛粪料液酸化效果的影响[J].环境工程学报,2015,9(2):934-938 |
| [9] | MU H,ZHAO C H, ZHAO Y X,et al.Enhanced methane production by semi-continuous mesophilic co-digestion of potato waste and cabbage waste:Performance and microbial characteristics analysis[J].Bioresource Technology, 2017,6:68-76 |
| [10] | 谢乔光,易莹,周艳伟,等.餐厨垃圾与市政污泥连续式混合中温厌氧消化[J].环境卫生工程,2014,2(5):69-72 |
| [11] | CHEN Y,CHENG J J,CREAMER K S.Inhibition of anaerobic digestion process:A review[J].Bioresource Technology,2008,9(10):4044-4064 |
| [12] | BABEL S, FUKUSHI K,SITANRASSAMEE B.Effect of acid speciation on solid waste liquefaction in anaerobic acid digester[J].Water Research,2004,8(9):2417-2423 |
| [13] | LI Q,QIAO W,WANG X C,et al.Kinetic characterization of thermophilic and mesophilic anaerobic digestion for coffee grounds and waste activated sludge[J].Waste Management,2015,6:77-85 |
| [14] | LI Q,LI Y Y,WEI Q,et al.Sulfate addition as an effective method to improve methane fermentation performance and propionate degradation in thermophilic anaerobic co-digestion of coffee grounds, milk and waste activated sludge with AnMBR[J].Bioresource Technology,2015,5:308-315 |
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进料频率对餐厨垃圾与剩余污泥中温共发酵系统稳定性的影响
张念瑞1,,李倩1,
许曼娟1,
王晓昌1
1.西安建筑科技大学环境与市政工程学院,西安 710055
基金项目: 国家自然科学基金资助项目(51608430) 中国博士后科学基金资助项目(2016M602781) 陕西省教育厅重点实验室项目(17JS077)
关键词: 餐厨垃圾/
剩余污泥/
中温厌氧共发酵/
负荷冲击/
挥发性脂肪酸
摘要:考察系统负荷(以COD计)为11.36 g·(L·d)-1时,6种不同进料频率下,餐厨垃圾和剩余污泥中温厌氧共发酵过程中产气量、气体组分、SCOD、pH和挥发性脂肪酸(VFAs)的变化,旨在明确进料频率对系统稳定性的影响,同时结合单一VFA的产甲烷动力学特性,探明系统不稳定的原因。结果表明,进料频率较高时,进料周期内系统的气体组分、SCOD和pH无明显变化,产气量呈线性增长,且基本无VFA积累。随着进料频率降低,进料初期过快的水解酸化导致SCOD和VFAs浓度呈现明显的先升高后逐渐降低的趋势,从而导致pH和甲烷含量波动明显。当进料频率为1 次·d-1时,系统中pH降至7.5,甲烷含量降至45.4%,丙酸占总有机酸的比例最高可达87.9%。相比乙酸而言,丙酸在甲烷化过程中存在的延滞期(1.21 h)及较低的甲烷化速率(5.01 mL·h-1)可能是导致存在丙酸积累的低频进料系统中稳定性较差的原因之一。
English Abstract
Effect of feeding frequency on stability of mesophilic co-digestion of food waste and waste activated sludge
ZHANG Nianrui1,,LI Qian1,
XU Manjuan1,
WANG Xiaochang1
1.School of Environmental & Municipal Engineering, Xi′an University of Architecture & Technology, Xi′an 710055,China
Keywords: food waste/
waste activated sludge/
mesophilic anaerobic co-digestion/
load shock/
volatile fatty acids
Abstract:In order to know the effects of feeding frequency on stability of co-digestion of food waste and waste activated sludge, the variation of biogas production, biogas composition, SCOD, pH and VFAs were investigated at 6 different feeding frequency under OLR(calculated by COD) of 11.36 g·(L·d)-1. Meanwhile, the kinetic characteristics of methanogensis of individual VFA were also analyzed to know the reason for instable performance. Results showed that in a feeding period, the variation of gas composition, SCOD and pH were not significant, biogas production increased almost linearly without VFA accumulation at the high feeding frequency. With the decrease of feeding frequency, the fast hydrolysis and acidogenesis led to the increase of SCOD and VFAs concentration at the beginning of the feeding period, then gradually decreased, and resulted in the significant fluctuation of pH and methane percentage in biogas. At the feeding frequency of 1 d, pH declined to 7.5, the content of methane dropped to 45.4%. The concentration of propionic accounted for 87.9% of TVFA. Compared with acetate, the lag time (1.21 h) and lower rate (5.01 mL·h-1) of methanogenesis of propionate should be one reason for instable performance of low feeding frequency system.
