View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Kyoto University Research Information Repository Pilot-scale anaerobic digestion of municipal biowaste with Title thermal hydrolysis pre-treatment( Dissertation_全文 ) Author(s) Zhou, Yingjun Citation Kyoto University (京都大学) Issue Date 2013-03-25 URL http://dx.doi.org/10.14989/doctor.k17542 Right Type Thesis or Dissertation Textversion author Kyoto University Pilot-scale anaerobic digestion of municipal biowaste with thermal hydrolysis pre-treatment YINGJUN ZHOU 2013 Pilot-scale anaerobic digestion of municipal biowaste w ith thermal hydrolysis pre-treatment ith thermal hydrolysis YINGJUN ZHOU 2013 Table of Contents Chapter 1 Introduction ........................................................................................................ 1 1.1 Background .................................................................................................................. 1 1.2 Objectives ..................................................................................................................... 2 1.3 Contents ........................................................................................................................ 3 References ........................................................................................................................... 5 Chapter 2 Reference survey................................................................................................ 7 2.1 Production and disposal of municipal biowaste ........................................................... 7 2.1.1 Organic fractions of municipal solid waste .............................................................. 7 2.1.2 Restaurant kitchen waste and market fruit-vegetable waste ..................................... 8 2.1.3 Wasted sewage sludge .............................................................................................. 9 2.1.4 Strategies for municipal biowaste disposal ............................................................. 10 2.2 Anaerobic digestion: principle and application .......................................................... 12 2.2.1 Basic principles of anaerobic digestion .................................................................. 12 2.2.2 Anaerobic digestion of municipal biowaste: application ........................................ 14 2.2.3 Anaerobic digestion of municipal biowaste: economic, environmental and energetic feasibility ........................................................................................................... 15 2.3 Anaerobic digestion of municipal biowaste: limitation and solutions ....................... 16 2.3.1 Limitation from solid hydrolysis and its solution ................................................... 16 2.3.2 Limitation from microbial growth and its solution ................................................. 19 2.4 Application of thermal hydrolysis as pre-treatment before anaerobic digestion ....... 20 2.5 Anaerobic sequencing batch reactor (ASBR) ............................................................ 20 Reference ........................................................................................................................... 22 Chapter 3 Effect of thermal hydrolysis on properties of municipal biowaste .................. 31 3.1 Introduction ................................................................................................................ 31 3.2 Materials and methods ............................................................................................... 32 3.2.1 Municipal biowaste ................................................................................................. 32 3.2.2 Pilot-scale thermal hydrolysis facility .................................................................... 33 3.2.3 Lab-scale thermal hydrolysis facility ...................................................................... 33 I 3.2.4 Sampling and analysis ............................................................................................ 34 3.3 Effect of thermal hydrolysis on biochemical properties of MBW ............................. 36 3.3.1 Solids and sCOD ..................................................................................................... 36 3.3.2 Inhibitors and related parameters: VFA, ammonia, alkalinity and pH ................... 38 3.3.3 Digestibility ............................................................................................................ 39 3.4 Effect of thermal hydrolysis on physical properties of MBW ................................... 40 3.4.1 Particle size distribution ......................................................................................... 40 3.4.2 Viscosity ................................................................................................................. 42 3.4.3 Dewaterability ......................................................................................................... 43 3.4.4 Settling performance ............................................................................................... 44 3.5 Conclusion .................................................................................................................. 44 Reference ........................................................................................................................... 45 Chapter 4 Effect of thermal hydrolysis on anaerobic digestion of municipal biowaste ... 49 4.1 Introduction ................................................................................................................ 49 4.2 Materials and methods ............................................................................................... 49 4.2.1 Digesters ................................................................................................................. 49 4.2.2 Operating parameters .............................................................................................. 50 4.2.3 Sampling and analysis ............................................................................................ 51 4.2.4 Batch monitoring during one treatment cycle ......................................................... 51 4.3 Digester stability ........................................................................................................ 51 4.3.1 Effluent properties .................................................................................................. 52 4.3.2 Batch monitoring during one treatment cycle ......................................................... 55 4.4 Digester performance ................................................................................................. 57 4.4.1 Biogas and methane production .............................................................................. 57 4.4.2 Removal of VS ....................................................................................................... 58 4.4.3 Methane production ................................................................................................ 59 4.5 Discussion on energy consumption ............................................................................ 62 4.6 Conclusion .................................................................................................................. 63 Reference ........................................................................................................................... 64 II Chapter 5 Application of anaerobic sequencing batch reactors for the digestion of thermally hydrolyzed municipal biowaste ............................................................................... 67 5.1 Introduction ................................................................................................................ 67 5.2 Materials and methods ............................................................................................... 68 5.2.1 Digesters ................................................................................................................. 68 5.2.2 Operating parameters .............................................................................................. 68 5.2.3 Sampling and analysis ............................................................................................ 69 5.3 Solid settling in ASBR ............................................................................................... 69 5.3.1 Settling theory ......................................................................................................... 69 5.3.2 Solid settling and accumulation at relative lower OLRs ........................................ 71 5.3.3 Solid settling and accumulation at a relative higher OLR: effect of biogas production .......................................................................................................................... 74 5.3.4 Relationship between viscosity and SS concentration ............................................ 75 5.4 Digester stability and performance: comparison with CSTR ..................................... 77 5.4.1 Digester stability ..................................................................................................... 77 5.4.2 Digester performance .............................................................................................. 81 5.5 Conclusion .................................................................................................................. 82 Reference ..........................................................................................................................