Mikrobiell förbehandling
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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

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Mikrobiell f rbehandling guido zacchi lth

Mikrobiell förbehandling

Guido Zacchi, LTH


Mikrobiell f rbehandling 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

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


The influence of impregnation with lactic acid on sugar yields from steam pretreatment

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)


Mikrobiell f rbehandling guido zacchi lth

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


Mikrobiell f rbehandling guido zacchi lth

Pretreatment conditions


The influence of impregnation with lactic acid on sugar yields from steam pretreatment1

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)


Mikrobiell f rbehandling guido zacchi lth

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


Mikrobiell f rbehandling guido zacchi lth

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


Mikrobiell f rbehandling guido zacchi lth

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


Mikrobiell f rbehandling guido zacchi lth

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)


Mikrobiell f rbehandling guido zacchi lth

Ensiling – for storage (2)

Enzymatic Hydrolysis

Yield (g glucose per 100 gram cellulose)


Mikrobiell f rbehandling guido zacchi lth

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


Mikrobiell f rbehandling guido zacchi lth

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


Acknowledgements

Acknowledgements

PhD students: Sanam Monavari, Elisabeth Joelsson and Pia-Maria Bondesson

Swedish Energy Agency


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