Wastes to ethanol and biogas: Biological methods

Transcription

1 Wastes to ethanol and biogas: Biological methods Mohammad Taherzadeh Professor in Bioprocess Technology, Swedish Centre for Resource Recovery University of Borås Sweden

2 Swedish Centre for Resource Recovery Wastes and byproducts (Municipal, agricultural, forest, industries) Social aspects Thermal processes Chemical processes Biological processes Material Recycling Logistic optimization Chemicals Biopolymers Chill Electricity Heat Diesel Gasoline Biogas Ethanol Metals Plastics Papers Glass Sustainable Society

3 Seniors: Biotechnology group Mohammad Taherzadeh Ilona Sarvari Horvath Patrik Lennartsson Akram Zamani Päivi Ylitervo Postdocs: Swarnima Agnihotri Kumar Jorge Ferreira Current PhD students: Ramkumar Nair Mostafa Jabbari Osagie Alex Osadolor Regina Jijoho Patinvoh Konstantinos Chandolias Pedro Ferreira Veronika Bátori Amir Mahboobi Lukitawesa Steven Wainaia Rebecca Gmoser

4 Our graduated PhDs since Mohammad Pourbafrani, Akram Zamani, Azam Jeihanipour, Patrik Lennartsson, Gergely Forgacs, Supansa Youngsukkasem, Anna Teghammar, Isroi, Johan Westman, Solmaz Aslanzadeh, Johan Westman, Solmaz Aslanzadeh, Hamidreza Barghi, Päivi Ylitervo, Mofoluwake Ishola, Rachma Wikandari, Maryam Mohseni Kabir, Julius Akinbomi, Karthik Rajendran, Jorge Ferreira, Jhosane Pagés Díaz, 2015

5 Challenging wastes = Research subjects

6 What we develop! Hydrogen Biogas Residuals & Wastes Biotech. group Ethanol Feed/food Biopolymers

7 Ethanol is the leading biofuel in the market (data for ) Ref: REN21

8 What is Biogas? Matter % Methane, CH Carbon dioxide, CO Nitrogen, N Hydrogen, H Hydrogen sulphide, H 2 S 0-3 Oxygen, O 2 0-2

9 Biogas market No global data China: 100,000 large modern plants 43 million household digesters Europe: ca 15,000 plants (ca 50% in Germany) Electricity is the major market (ca 50%) Agricultural products, wastes and sluge are used!

10 Use of biogas in Sweden

11 How to convert sugars to ethanol? CO2 Sugars Fermentation Ethanol

12 How to convert starch to ethanol? Starch CO2 Hydrolysis Sugars Fermentation Ethanol

13 How to convert cellulose to ethanol? Cellulose CO2 Hydrolysis Sugars Fermentation Ethanol

14 How to convert cellulose to ethanol? Dry wastes Gasification Syngas Catalysis Fermentation Ethanol CO 2H 2

15 Value of raw materials vs. process units for ethanol Sugars Starch Cellulose Wastes Residual separation Pretreatment??? Hydrolysis/Saccharification Fermentation Distillation/dehydration Ethanol

16 Biogas? Sugars Starch Cellulose Wastes Residual separation Pretreatment??? Hydrolysis/Saccharification Fermentation Downstream processes Biogas (methane)

17 Biogas: microorganisms take care of everything 1. Hydrolysis 2. Acidogenesis 3. Acetogenesis 1. Methanogenesis

18 Challenges for ethanol and biogas Finding suitable substrate Pretreatment: Increasing biodegradability Removing inhibitors Removing indigestible materials Reducing costs: Cheaper process? Faster process? Using current infrastrucure (e.g. integration of 1 st and 2 nd generation ethanol)

19 A typical substrate with problem: Citrus wastes As hemicellulose As hemicellulose As pectin Limonene ca 0.5%

20 Lignin and crystallinity in lignocelluloses Hemicellulose Lignin Cellulose chains

21 Similar problems with Keratins: The recalcitrant proteins Human hair & nails Wool Feather

22 Degradation of cellulose by: Cellulase enzyme vs. Bacterial cellulosome It is preferred in industry! anaerobic bacteria produce much less cellulolytic enzymes than do the fungi: 22

23 Physical Pretreatments Millings Irradiation Others Ball milling Gamma-ray irradiation Hydrothermal Two-roll milling Electron-beam irradiation High pressure steaming Hammer milling Microwave irradiation Expansion Colloid milling Extrusion Vibro energy milling Pyrolysis Int. J. Mol. Sci. 2008, 9:

24 Chemical & physico-chemical Pretreatments Explosions Alkali Acids Gases Oxidizing agents Steam explosion Sodium hydroxide Sulfuric acid Chlorine dioxide Hydrogen peroxide Ammonia fiber explosion (AFEX) Ammonia Hydrochloric acid Nitrogen dioxide Wet oxidation CO 2 explosion SO 2 explosion Ammonium Sulfite Phosphoric acid Sulfur dioxide Ozone Int. J. Mol. Sci. 2008, 9:

25 Textile reactors for biogas & ethanol

26 Integration on 1 st and 2 nd generation ethanol using fungi Grain Pretreatment Hydrolysis Lignocelluloses Fresh Water Yeast CO 2 Pretreatment Water & ethanol Evaporation Biomass separation Hydrolysis Fermentation Fungal cultivation Distillation Centrifugation Ethanol Stillage Syrup Drying Solids Wastewater Drying Animal feed Animal feed (DDGS)

27 Turning ethanol plant to biorefinery using edible fungi

28 Thank you! Questions?