1 / 14

Mikrobiell förbehandling Guido Zacchi, LTH

Mikrobiell förbehandling Guido Zacchi, LTH. Overall aim. Develop and optimise pretreatment of lignocellulosic agricultural raw materials and rest products. Pre-pretreatment to facilitate storage and to facilitate the pretreatment

debbie
Download Presentation

Mikrobiell förbehandling Guido Zacchi, LTH

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Mikrobiell förbehandling Guido Zacchi, LTH

  2. Overall aim Develop and optimise pretreatment of lignocellulosic agricultural raw materials and rest products Pre-pretreatment to facilitate storage and to facilitate the pretreatment Perform pretreatment at milder conditions with a high yield of carbohydrates and minimal degradation of sugars Improve the production of biogas from the stillage after SSF of pretreated material Should result in better utilisation of the agricultural residues i.e with higher energy efficiency and lower production cost

  3. The influence of impregnation with lactic acid on sugar yields from steam pretreatment • Organic acids (Lactic acid) : • Weak acids (Less corrosive, lower degree of neutralization) • Biodegradable to produce biogas • Ensilage (crop preservation method)

  4. Schematic process Biomass Dehydration Ethanol SSF Enzymatic Hydrolysis Pretreatment Distillation Fermentation Stillage Yeast cultivation Liquid Heat & Power CHP Lignin Sep AD Biogas Pretreatment influences all other process steps! WWT Sludge

  5. Pretreatment conditions

  6. The influence of impregnation with lactic acid on sugar yields from steam pretreatment Sugarcane bagasse OM:One month storage with Lac TM:Two months storage with Lac Ref.:Impregnation with SO2 only Ref.L:Impregnation with Lac only -S:Only storage with Lac +S:Storage with Lac and impregnation with SO2 Sugar yield (% of theoretical in the raw material)

  7. Sugar degradation products (g/100 g raw material) Concentration (g/100 g raw material) OM-S OM+S TM-S TM+S Ref. Ref.L

  8. Steam pretreatment of wheat straw The influence of impregnation with acetic acid Straw Ethanol Slurry Scenario 1 Pretreatment Distillation SSF Stillage Biogas Liquid AD Solid Straw Sep Sep Solid Ethanol Scenario 2 Pretreatment Distillation SSF Liquid Stillage Biogas AD

  9. Steam pretreatment of wheat straw The influence of impregnation with acetic acid Energy efficiency (%) Lignin assumed to be used for process heat + electricty Acetic acid concentration

  10. Ensiling – for storage Oleskowicz-Popiel et al, Biomass and Bioenergy 35, p2087 (2011) Crops Fresh maize (whole crop) Fresh rye (whole crop) Fresh clover (whole crop) Enzymatic hydrolysis and SSF tested for Fresh material Ensiled material Pretreated ensiled material (190 C, 10 min at 6% DM)

  11. Ensiling – for storage (2) Enzymatic Hydrolysis Yield (g glucose per 100 gram cellulose)

  12. Ensiling – for storage (3) SSF(with S.cerevisae) Overall ethanol yield % of theoretical based on available C6 sugars in raw material OBS The materials contain also some starch! Some of the sugars are converted to acids during ensiling

  13. Conclusions • The use of an organic acid (or silage) for storage has improved the pretreatment. • Biogas production after pretreatment with an organic acid works well (data not shown). • Next step is to consider also pentose fermentation as an option and investigate more crops/residues • Perform real ensilage on selected residues

  14. Acknowledgements PhD students: Sanam Monavari, Elisabeth Joelsson and Pia-Maria Bondesson Swedish Energy Agency

More Related