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Upstream Processing of Lactose whey for bulk chemicals and energy production

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CORE-SCCER CONFERENCE, 20 November 2020, Bern

CORE-SCCER CONFERENCE, 20 November 2020, Bern

Project started with delay (Covid-19) in III/2020.

From former experimental work, proof of concept for emulsion-free extraction (no energy demanding mixing/settling/centrifugation required) could be shown for

 Lactic acid

 Mandelic acid

 Itanconic acid

 Succinic acid

Energy research conference, 20 November 2020, Biel

Upstream Processing of Lactose whey for bulk chemicals and energy production

(an ongoing ERA-NET Bioenergy – project)

Using membrane contactors (delivered from swiss start-up company “MemO3 GmbH”) LA can be extracted in-situ from the fermentation broth.

This project will develop and assess new membrane technology for valorising dairy wastes and in particular sour lactose whey for sustainable production of lactic acid (LA) within the ERA-NET-project:

Research supported by:

This approach is promising due to:

• a reduced amount of working steps

no additional chemicals

(savings of ~450 kg Ca(OH)2and 500 kg H2SO4per ton lactic acid)

Lactic acid could be used for poly-lactic acid (PLA) plastic products, which are compostable (reduction of plastic waste). However, in conventional lactic acid production additional chemicals are required (e.g. for pH-adjustment):

1 ton of lactic acid = 1 ton of gypsum

LA is precipiated with Ca(OH)2 and released after fermentation with sulfuric acid - by forming equal amount of gypsum.

Additonally, the LA extraction generates (stable) emulsions which needs to be separated with centrifuges in order to obtain a clear LA solution.

This generates both higher investment costs and energy demand for the operation.

energy savings

(two centrifuges with each about 15-20

 kWh m−3 and one mixing unit with about 5-7 kWh m−3).

1 ton of lactic acid = 1 ton of gypsum

• emulsion-free extraction

• clear LA extract

• no centrifuge

• no chemicals

Next steps:

Project partner MemO3GmbH provides us with dedicated membrane modules for

•Extraction with model solutions

•Extraction with industrial process streams (TRL 4-5)

Contact: wolfgang.riedl@fhnw.ch

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