Effects of pretreatments on anaerobic co-digestion of kitchen waste and other organic wastes
XU Yiwen1, JIANG Jianguo1,2, LIU Nuo1, YANG Meng1, MENG Yuan1
1. School of Environment, Tsinghua University, Beijing 100084, China; 2. Key Laboratory for Solid Waste Management and Environment Safety of Ministry of Education, Tsinghua University, Beijing 100084, China
Abstract：The effects of different pretreatments including ultrasound, microwave and alkali thermal pretreatments on anaerobic co-digestion of kitchen waste and other organic wastes were studied through biochemical methane potential (BMP) experiments. The experiment without pretreatment served as the control. After the pretreatments, some of the primary organics are solubilized by hydrolysis and liquefaction reactions resulting in higher concentrations of volatile fatty acids (VFA), soluble chemical oxygen demand (SCOD) and total ammonia nitrogen (TAN) which improve the efficiency of the subsequent anaerobic co-digestion. The BMP results show that the pH and VFA, SCOD and TAN concentrations in the four experiments all have the same trend and gradually stabilize after 6 days, indicating that the biodegradable organics in the substrate are completely decomposed in a short time. In addition, the pretreatments improve the biogas production rate. Ultrasonic pretreatment increases the methane yield from 285 mL/g VS to 324 mL/g VS, which is consistent with the modified theoretical methane yield, while microwave and alkali thermal pretreatments inhibit anaerobic fermentation.
徐一雯, 蒋建国, 刘诺, 杨梦, 孟园. 预处理对厨余垃圾等有机废弃物联合厌氧发酵的影响[J]. 清华大学学报（自然科学版）, 2019, 59(7): 558-566.
XU Yiwen, JIANG Jianguo, LIU Nuo, YANG Meng, MENG Yuan. Effects of pretreatments on anaerobic co-digestion of kitchen waste and other organic wastes. Journal of Tsinghua University(Science and Technology), 2019, 59(7): 558-566.
 HAFID H S, RAHMAN N A A, SHAH U K M, et al. Feasibility of using kitchen waste as future substrate for bioethanol production:A review[J]. Renewable & Sustainable Energy Reviews, 2017, 74:671-686.  岳远, 李兵, 王伟锋, 等. 餐厨垃圾与市政污泥共消化厌氧产氢研究[J]. 宁波大学学报(理工版), 2018, 31(6):110-114. YUE Y, LI B, WANG W F, et al. Study on hydrogen production by anaerobic co-digestion of kitchen waste and sewage sludge[J]. Journal of Ningbo University (Natural Science & Engineering), 2018, 31(6):110-114. (in Chinese)  ZHANG C S, SU H J, BAEYENS J, et al. Reviewing the anaerobic digestion of food waste for biogas production[J]. Renewable & Sustainable Energy Reviews, 2014, 38:383-392.  WANG Y Y, ZANG B, LI G X, et al. Evaluation the anaerobic hydrolysis acidification stage of kitchen waste by pH regulation[J]. Waste Management, 2016, 53:62-67.  GUO Q, DAI X H. Analysis on carbon dioxide emission reduction during the anaerobic synergetic digestion technology of sludge and kitchen waste:Taking Kitchen Waste Synergetic Digestion Project in Zhenjiang as an example[J]. Waste Management, 2017, 69:360-364.  SLEZAK R, GRZELAK J, KRZYSTEK L, et al. The effect of initial organic load of the kitchen waste on the production of VFA and H2 in dark fermentation[J]. Waste Management, 2017, 68:610-617.  ZHANG C, SU H, BAEYENS J, et al. Reviewing the anaerobic digestion of food waste for biogas production[J]. Renewable & Sustainable Energy Reviews, 2014, 38:383-392.  XU F Q, LI Y Y, GE X M, et al. Anaerobic digestion of food waste:Challenges and opportunities[J]. Bioresource Technology, 2018, 247:1047-1058.  LI P Y, XIE Y, ZENG Y, et al. Bioconversion of welan gum from kitchen waste by a two-step enzymatic hydrolysis pretreatment[J]. Applied Biochemistry and Biotechnology, 2017, 183(3):820-832.  WANG Y Y, ZANG B, GONG X Y, et al. Effects of pH buffering agents on the anaerobic hydrolysis acidification stage of kitchen waste[J]. Waste Management, 2017, 68:603-609.  YUN Y M, LEE M K, IM S W, et al. Biohydrogen production from food waste:Current status, limitations, and future perspectives[J]. Bioresource Technology, 2018, 248(A):79-87.  MOON H C, SONG I S, KIM J C, et al. Enzymatic hydrolysis of food waste and ethanol fermentation[J]. International Journal of Energy Research, 2009, 33(2):164-172.  WANG X, ZHAO Y C. A bench scale study of fermentative hydrogen and methane production from food waste in integrated two-stage process[J]. International Journal of Hydrogen Energy, 2009, 34(1):245-254.  DI MARIA F, SORDI A, CIRULLI G, et al. Amount of energy recoverable from an existing sludge digester with the co-digestion with fruit and vegetable waste at reduced retention time[J]. Applied Energy, 2015, 150:9-14.  AKINDELE A A, SARTAJ M. The toxicity effects of ammonia on anaerobic digestion of organic fraction of municipal solid waste[J]. Waste Management, 2017, 71:757-766.  DRENNAN M F, DISTEFANO T D. High solids co-digestion of food and landscape waste and the potential for ammonia toxicity[J]. Waste Management, 2014, 34(7):1289-1298.  YUAN H P, ZHU N W. Progress in inhibition mechanisms and process control of intermediates and by-products in sewage sludge anaerobic digestion[J]. Renewable & Sustainable Energy Reviews, 2016, 58:429-438.  CARLSSON M, LAGERKVIST A, MORGAN-SAGASTUME F. The effects of substrate pre-treatment on anaerobic digestion systems:A review[J]. Waste Management, 2012, 32(9):1634-1650.  CESARO A, BELGIORNO V. Pretreatment methods to improve anaerobic biodegradability of organic municipal solid waste fractions[J]. Chemical Engineering Journal, 2014, 240:24-37.  CARRERE H, ANTONOPOULOU G, AFFES R, et al. Review of feedstock pretreatment strategies for improved anaerobic digestion:From lab-scale research to full-scale application[J]. Bioresource Technology, 2016, 199:386-397.  CESARO A, BELGIORNO V. Sonolysis and ozonation as pretreatment for anaerobic digestion of solid organic waste[J]. Ultrasonics Sonochemistry, 2013, 20(3):931-936.  MARIN J, KENNEDY K J, ESKICIOGLU C. Effect of microwave irradiation on anaerobic degradability of model kitchen waste[J]. Waste Management, 2010, 30(10):1772-1779.  LIM J W, WANG J Y. Enhanced hydrolysis and methane yield by applying microaeration pretreatment to the anaerobic co-digestion of brown water and food waste[J]. Waste Management, 2013, 33(4):813-819.  LIU X, WANG W, GAO X B, et al. Effect of thermal pretreatment on the physical and chemical properties of municipal biomass waste[J]. Waste Management, 2012, 32(2):249-255.  MONLAU F, KAPARAJU P, TRABLY E, et al. Alkaline pretreatment to enhance one-stage CH4 and two-stage H2/CH4 production from sunflower stalks:Mass, energy and economical balances[J]. Chemical Engineering Journal, 2015, 260:377-385.  王佳明, 蒋建国, 宫常修, 等. 超声波预处理对餐厨垃圾产VFAs的影响[J]. 中国环境科学, 2014, 34(5):1207-1211.WANG J M, JIANG J G, GONG C X, et al. Effects of ultrasonic pre-treatment on the production of VFAs from food waste[J]. China Environmental Science, 2014, 34(5):1207-1211. (in Chinese)  LI Y Y, JIN Y Y, LI J H, et al. Effects of thermal pretreatment on the biomethane yield and hydrolysis rate of kitchen waste[J]. Applied Energy, 2016, 172:47-58.  LI Y Y, JIN Y Y, Borrion A, et al. Effects of organic composition on mesophilic anaerobic digestion of food waste[J]. Bioresource Technology, 2017, 244(1):213-224.  WANG Y Y, ZHANG Y L, WANG J B, et al. Effects of volatile fatty acid concentrations on methane yield and methanogenic bacteria[J]. Biomass & Bioenergy, 2009, 33(5):848-853.  何仕均, 王建龙, 赵璇. 氨氮对厌氧颗粒污泥产甲烷活性的影响[J]. 清华大学学报(自然科学版), 2005, 45(9):1294-1296.HE S J, WANG J L, ZHAO X. Effect of ammonium concentration on the methanogenic activity of anaerobic granular sludge[J]. Journal of Tsinghua University (Science and Technology), 2005, 45(9):1294-1296. (in Chinese)  YE C, CHENG J J, CREAMER K S. Inhibition of anaerobic digestion process:A review[J]. Bioresource Technology, 2008, 99(10):4044-4064.  SILES J A, BREKELMANS J, MART AI'G N M A, et al. Impact of ammonia and sulphate concentration on thermophilic anaerobic digestion[J]. Bioresource Technology, 2010, 101(23):9040-9048.  LAUTERBÖCK B, ORTNER M, HAIDER R, et al. Counteracting ammonia inhibition in anaerobic digestion by removal with a hollow fiber membrane contactor[J]. Water Research, 2012, 46(15):4861-4869.  李海红, 巴琦玥, 闫志英, 等. 不同原料厌氧发酵及其微生物种群的研究[J]. 中国环境科学, 2015, 35(5):1449-1457.LI H H, BA Q Y, YAN Z Y, et al. Studies on microbial community of different materials and anaerobic fermentation[J]. China Environmental Science, 2015, 35(5):1449-1457. (in Chinese)  REN Y, YU M, WU C, et al. A comprehensive review on food waste anaerobic digestion:Research updates and tendencies[J]. Bioresource Technology, 2018, 247:1069-1076.  CESARO A, BELGIORNO V. Sonolysis and ozonation as pretreatment for anaerobic digestion of solid organic waste[J]. Ultrasonics Sonochemistry, 2013, 20(3):931-936.  SHAHRIARI H, WARITH M, HAMODA M, et al. Evaluation of single vs. staged mesophilic anaerobic digestion of kitchen waste with and without microwave pretreatment[J]. Journal of Environmental Management, 2013, 125:74-84.