湿热预处理对餐厨垃圾高温干式厌氧消化的影响
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摘要
为探索湿热预处理对餐厨垃圾高温干式厌氧消化的影响,在含固率为20%、发酵温度55℃的条件下进行厌氧发酵试验。采用L9(33)正交试验设计,研究湿热预处理的加水率、温度、时间对餐厨垃圾干式厌氧消化产沼气的影响。结果表明:湿热处理后餐厨垃圾的理化性质有明显变化,日产气量、累积产气量以及TS和VS的去除率明显升高。当湿热预处理条件为加水率50%、温度120℃、时间80min时,SCOD值最高,为101 050mg/L,比未处理时提高了5.6倍。同样,该条件下日产气量出现的两个产气峰值最高,累积产气量也最高,为269.10ml/gVS,与未处理相比累积产气量提高49.4%。各因素对餐厨垃圾厌氧发酵产气量影响的主次关系为:温度>时间>加水率,处理温度和处理时间对产气量有显著性影响,加水率对产气量影响较弱。
Anaerobic fermentation tests were carried out with 20%solid content at the temperature of 55℃to investigate the effect of hydrothermal pretreatment on thermophilic anaerobic digestion of food waste.Orthogonal test L9(33)was employed to determine the effects of water addition ratio,temperature and time.The results show that the physical and the chemical properties of food waste change significantly after hydrothermal treatment.The daily biogas production,the cumulative biogas production and the removal rates of TS and VS of food waste increase significantly after pretreatment.When the water addition ratio is 50%,temperature is 120℃and pretreatment time is 80 min,we get 101 050mg/L SCOD,which is 5.6times of that of the untreated group.The peak values of daily and cumulative biogas production also reach the maximum under these pretreatment conditions.The maximum cumulative biogas production is 269.10mL/g VS,which increases by 49.4%than that of the untreated group.The influences of the three factors on thermophilic anaerobic fermentation of food waste are temperature>time>water addition ratio. The effects of temperature and time of hydrothermal pretreatment on food waste fermentation are evident,while the effect of water addition ratio is less evident.
Anaerobic fermentation tests were carried out with 20%solid content at the temperature of 55℃to investigate the effect of hydrothermal pretreatment on thermophilic anaerobic digestion of food waste.Orthogonal test L9(33)was employed to determine the effects of water addition ratio,temperature and time.The results show that the physical and the chemical properties of food waste change significantly after hydrothermal treatment.The daily biogas production,the cumulative biogas production and the removal rates of TS and VS of food waste increase significantly after pretreatment.When the water addition ratio is 50%,temperature is 120℃and pretreatment time is 80 min,we get 101 050mg/L SCOD,which is 5.6times of that of the untreated group.The peak values of daily and cumulative biogas production also reach the maximum under these pretreatment conditions.The maximum cumulative biogas production is 269.10mL/g VS,which increases by 49.4%than that of the untreated group.The influences of the three factors on thermophilic anaerobic fermentation of food waste are temperature>time>water addition ratio. The effects of temperature and time of hydrothermal pretreatment on food waste fermentation are evident,while the effect of water addition ratio is less evident.
引文
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[17]Cuetos M J,Gómez X,Otero M,et al.Anaerobic digestion and co-digestion of slaughterhouse waste(SHW):influence of heat and pressure pre-treatment in biogas yield[J].Waste Management,2010(30):1780-1789.
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[21]Efigênia M,Povoa B,Moraes T.Effect of heat treatment on the nutritional quality of milk proteins[J].International Dairy Journal,1997,7(8/9):609-612.
[22]Pang Y Z,Liu Y P,Li X J,et al.Improving biodegradability and biogas production of corn stover through sodium hydroxide solid state pretreatment[J].Energy and Fuels,2008,22(4):2761-2766.
[23]王宇卓,任连海,聂永丰.采用正交试验优化湿热法处理厨余垃圾的工艺条件[J].环境污染治理技术与设备,2005,6(10):53-57.WANG Yuzhuo,REN Lianhai,NIE Yongfeng.Study on optimizing operation parameters of wet heating treatment for kitchen waste with orthogonal experiments[J].Techniques and Equiment for Environmental Pollution Control,2005,6(10):53-57.(in Chinese)
[24]任南琪,王爱英.厌氧生物技术原理与应用[M].北京:化学工业出版社,2004.REN Nanqi,WANG Aiying.Principle and application of anaerobic biotechnology[M].Beijing:Chemical Industry Press,2004.(in Chinese)
[25]郝拉娣,张娴,刘琳.科技论文中正交试验结果分析方法的使用[J].编辑学报,2007,19(5):340-341.HAO Ladi,ZHANG Xian,LIU Lin.Analysis method of results in orthogonal design in scientific papers[J].Acta Editologica,2007,9(5):340-341.(in Chinese)
[2]马磊,王德汉,王梦男,等.矿物材料预处理对餐厨垃圾高温厌氧消化过程的影响[J].环境科学学报,2008,28(11):2277-2283.MA Lei,WANG Dehan,WANG Mengnan,et al.Effect of mineral pretreatment on thermophilic anaerobic digestion of food waste[J].Acta Science Circumstantiae,2008,28(11):2277-2283.(in Chinese)
[3]Elliott A,Mahmood T.Pretreatment technologies for advancing anaerobic digestion of pulp and paper biotreatment residues[J].Water Research,2007,41(19):4273-4286.
[4]冯磊,李润东.低强度超声波预处理对厨余垃圾厌氧消化的影响[J].环境工程学报,2012,6(9):3280-3286.FENG Lei,LI Rundong.Efficiency of anaerobic digestion of kitchen waste by low intensity ultrasound pretreatment[J].Chinese Journal of Environmental Engineering,2012,6(9):3280-3286.(in Chinese)
[5]Liu X,Wang W,Gao X,et al.Effect of thermal pretreatment on the physical and chemical properties of municipal biomass waste[J].Waste Management,2012,32(2):249-255.
[6]Kim S,Choi K,Kim J,et al.Biological hydrogen production by anaerobic digestion of food waste and sewage sludge treated using various pretreatment technologies[J].Biodegration,2013,24:753-764.
[7]Marin J,Kennedy K J,Eskicioglu C.Effect of microwave irradiation on anaerobic degradability of model kitchen waste[J].Waste Management,2010,30:1772-1779.
[8]Ma J X,Duong T H,Smits M.Enhanced biomethanation of kitchen waste by different pre-treatments[J].Bioresource Technology,2011:592-599.
[9]Hanableh A,Joma S.Production and transformation ofvolatile fatty acids from sludge subjected to hydrothermal treatment[J].Water Science and Technology,2001,44(10):129-135.
[10]任连海,聂永丰,刘建国,等.餐厨垃圾湿热处理的影响因素[J].清华大学学报(自然科学版),2006,46(9):1552-1554.REN Lianhai,NIE Yongfeng,LIU Jianguo,et al.Influence factors of restaurant waste hydrothermal treatment[J].Journal of Tsinghua University(Science and Technology),2006,46(9):1552-1554.(in Chinese)
[11]马磊,王德汉,谢锡龙,等.餐厨垃圾的高温厌氧消化处理研究[J].环境工程学报,2009,3(8):1509-1512.MA Lei,WANG Dehan,XIE Xilong,et al.Study on treatment of food waste by thermophilic anaerobic digestion[J].Chinese Journal Of Environmental Engineering,2009,3(8):1509-1512.(in Chinese)
[12]Fernández-Rodríguez J,Pérez M,Romero L I.Comparison of mesophilic and thermophilic dry anaerobic digestion of OFMSW:Kinetic analysis[J].Chemical Engineering Journal,2013,232:59-64.
[13]宁娜,任连海,王攀,等.湿热-离心法分离餐厨废油脂[J].环境科学研究,2011,24(12):1430-1434.NING Na,REN Lianhai,WANG Pan,et al.Hydrothermal process-centrifugation for separation of waste grease from restaurant garbage[J].Research of Environment Sciences,2011,24(12):1430-1434.(in Chinese)
[14]任连海,聂永丰,刘建国,等.湿热处理参数对餐厨垃圾脱水和脱油性能的影响[J].环境科学,2006,27(9):1906-1911.REN Lianhai,NIE Yongfeng,LIU Jianguo,et al.Impact of hydrothermal process on the dewaterability and degrease performance of restaurant garbage[J].Chinese Journal Of Environmental Science,2006,27(9):1906-1911.(in Chinese)
[15]林云琴,武书彬,梁嘉晋.预处理对造纸污泥和餐厨垃圾混合发酵的影响[J].华南理工大学学报(自然科学版),2012,40(5):71-75.LIN Yunqin,WU Shubin,LIANG Jiajin.Effect of pretreatment on mixed fermentation of paper mill sludge and food waste[J].Journal of South China University of Technology(Natural Science Edition),2012,40(5):71-75.(in Chinese)
[16]Shanableh A,Joma S.Production and transformation of volatile fatty acids from sludge subjected to hydrothermal treatment[J].Water Science and Technology,2001,44(10):129-135.
[17]Cuetos M J,Gómez X,Otero M,et al.Anaerobic digestion and co-digestion of slaughterhouse waste(SHW):influence of heat and pressure pre-treatment in biogas yield[J].Waste Management,2010(30):1780-1789.
[18]Pinnekamp J.Effect of thermal pretreatment of sewage sludge on anaerobic digestion[J].Water Science and Technology,1989,21:97-108.
[19]Tampio E,Ervasti S,Paavola T,et al.Anaerobic digestion of autoclaved and untreated food waste[J].Waste Managment,2014,34:370-377.
[20]Bougrier C,Delgenès J P,Carrère H.Effects of thermal treatments on five different waste activated sludge samples solubilisation,physical properties and anaerobic digestion[J].Chemical Engineering Journal,2008,139:236-244.
[21]Efigênia M,Povoa B,Moraes T.Effect of heat treatment on the nutritional quality of milk proteins[J].International Dairy Journal,1997,7(8/9):609-612.
[22]Pang Y Z,Liu Y P,Li X J,et al.Improving biodegradability and biogas production of corn stover through sodium hydroxide solid state pretreatment[J].Energy and Fuels,2008,22(4):2761-2766.
[23]王宇卓,任连海,聂永丰.采用正交试验优化湿热法处理厨余垃圾的工艺条件[J].环境污染治理技术与设备,2005,6(10):53-57.WANG Yuzhuo,REN Lianhai,NIE Yongfeng.Study on optimizing operation parameters of wet heating treatment for kitchen waste with orthogonal experiments[J].Techniques and Equiment for Environmental Pollution Control,2005,6(10):53-57.(in Chinese)
[24]任南琪,王爱英.厌氧生物技术原理与应用[M].北京:化学工业出版社,2004.REN Nanqi,WANG Aiying.Principle and application of anaerobic biotechnology[M].Beijing:Chemical Industry Press,2004.(in Chinese)
[25]郝拉娣,张娴,刘琳.科技论文中正交试验结果分析方法的使用[J].编辑学报,2007,19(5):340-341.HAO Ladi,ZHANG Xian,LIU Lin.Analysis method of results in orthogonal design in scientific papers[J].Acta Editologica,2007,9(5):340-341.(in Chinese)
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