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Mario Panjičko, Mladen Franjo, Goran Lukić Brodarski Institute d.o.o., Environmental technologies Center, Avenija V. Hol

Research of biogas production in laboratory and pilot scale in order to develop the treatment process of brewery waste streams. Mario Panjičko, Mladen Franjo, Goran Lukić Brodarski Institute d.o.o., Environmental technologies Center, Avenija V. Holjevca 20, Zagreb, Croatia.

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Mario Panjičko, Mladen Franjo, Goran Lukić Brodarski Institute d.o.o., Environmental technologies Center, Avenija V. Hol

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  1. Research of biogas production in laboratory and pilot scale in order to develop the treatment process of brewery waste streams Mario Panjičko,Mladen Franjo, Goran Lukić Brodarski Institute d.o.o., Environmental technologies Center, Avenija V. Holjevca 20, Zagreb, Croatia Sustainable landfill and waste management Novi Sad, 28.- 29.11.2013.

  2. Enivronmental technologies Center • Founded in Brodarski Institute Ltd., in March 2011 • The Center is funded through the Business Innovation Agency of the Republic of Croatia through the TEHCRO program • It consists of anoffice for technologies design, research and development team, physical-chemical laboratory and mobile pilot plant for biological treatment of waste materials

  3. Enivronmental technologies Center • Implementationanddesign • Waste treatment • Wastewatertreatment • Biogasproduction • Researchanddevelopment • Physical-chemical laboratory • Pilot plant for biologicaltreatmentof waste materials

  4. Anaerobic digestion

  5. Anaerobic digestion • Feedstocks for AD • MUNICIPALITIES – OFMSW, sewage sludge, grass clippings, garden waste, food remains... • AGRICULTURE – manure (cattle, pig, poultry), energy crops, harvest remains, algal biomass... • INDUSTRY – food/beverage processing, dairy, starch industry, sugar industry, biochemical industry, pulp and paper industry, slaughterhouse/rendering plant...

  6. Anaerobic digestion in Europe 6.000.000 tpy 197 plants 3.475.000 tpy 112 plants 1.400.000 tpy 58 plants 281.000 tpy 12 plants 87.000 tpy 2 plants 1990 1995 2000 2005 2010

  7. Advantages for dry digestion systems • Very tolerant system for contaminants (sand, fibres, large particles) • Less complex system compared to wet AD systems • Less maintenance required • Less critical equipment (pumps, agitation systems, feeding equipment) • Operation costs may therefore be less compared to wet systems • Possibility of mobile biogas plants (containers)

  8. Brewery waste streams • Wastewater • Biogas potential: 0,3-0,4 m3/kg COD • Treated by conventional methods of wastewater treatment • Waste yeast • Biogas potential: 0,78 m3/kg dry organic matter • Current use: animal feed supplement • Brewer’s spent grain (BSG) • Biogas potential: 0,6–1,2 m3/kg dry organic matter • Current use: animal feed supplement

  9. Brewer’s spent grain • BSG – solid material, granular size 2-4 mm • In general, BSG is considered lignocellulosic material that is rich in fiber (70%) and protein (20%) • BSG contains 16,8-25,4% of cellulose, 21,8-27,8% of hemicellulose and 11,9-27,8% of lignin • The process of anaerobic digestion of BSGis not fully developed yet, mainly due to the low biodegradability • Complexity of lignin structure, high molecular weight, chemical stability and insolubility contribute to the difficult biodegradability of lignocellulosic substrates

  10. Experiments Laboratory scale • Two experiments, one- and two-stage treatment • Raw BSG inoculated with granulated microorganisms

  11. Experiments Laboratory • TOC analyzer • Determination of TOC concentration in liquid and solid samples • Determination of TN concentration in liquid samples • Gas chromatograph (GC) • Determination of biogas composition: CH4, CO2, H2, O2, CO, NH3, N2 and H2S content

  12. Experiments Pilot scale • Location: wastewater treatment plant in Laško

  13. Experiments Biogas Pilot scale • One-stage treatment • Raw BSG • Granulated microorganisms • Brewery wastewater recirculated through the reactor • Quantity of produced biogas and degradation of dry matter was determined BSG + granulated microorganisms Wastewater Wastewater

  14. Results Laboratory scale • Total amount of produced biogas

  15. Results Laboratory scale • CH4 content in produced biogas

  16. Results Pilot scale • Total amount of and CH4 content in produced biogas

  17. Results Biogas yield and degradation of dry matter BEFORE TREATMENT AFTER TREATMENT

  18. Conclusion • From the results of experiments, it can be concluded that anaerobic digestion is suitable for BSG treatment. • Benefits: produced biogas, the weight of disposal waste is reduced. • Results show that the two-stage process is more efficient than single stage due to biogas yield and dry matter degradation. • Further steps in process improvement  pretreatment of BSG. • The aim of pretreatment is the conversion of complex organic compounds into simpler molecules in order to increase biogas yield in anaerobic digestion process.

  19. Conclusion Step 1 Step 2 Step 3 Step 4 • Results obtained during research will be a guide for the brewery to create a more environmentally sustainable system which includes the treatment of all waste streams and the production of energy. ?

  20. Thank you for your attention! Mario Panjičko Centar za ekotehnologije / BI Av. V. Holjevca 20 10000 Zagreb mario.panjicko@hrbi.hr Tel: +385 91 2100 696

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