How do breweries recover and reuse CO2 from fermentation in non-alcoholic beer production?

CO2 Recovery in NA Beer Production: Capture, Purification and Reuse in Carbonation

During beer fermentation, yeast produces approximately 4 litres of CO2 gas per litre of ethanol produced. Even in non-alcoholic beer fermentation, where alcohol accumulation is limited to < 0.5% ABV, significant CO2 is generated and typically vented to atmosphere. Modern NA breweries increasingly capture this CO2, purify it to beverage grade, and reuse it for carbonation and vessel pressurisation — reducing both environmental emissions and procurement costs for externally supplied CO2.

A CO2 recovery system at a brewery consists of: (1) a gas collection hood on the fermentation vessel to capture the escaping CO2; (2) a foam trap and water scrubber to remove entrained beer foam and water vapour; (3) a gas holder (buffer tank) to store variable-rate production; (4) a compression stage to 20–25 bar; (5) activated carbon filtration and cooling to purify the CO2 of yeast metabolites (particularly hydrogen sulfide, acetaldehyde, and other volatiles that create off-notes); (6) a liquefaction unit to convert gas to liquid CO2 for storage and dispensing. The purified liquid CO2 is then used for tank pressurisation, carbonation, and (in some breweries) flash pasteurisation.

For NA beer specifically, CO2 recovery is more efficient per unit of beer produced than for conventional beer at the same batch size — NA fermentation produces CO2 at lower total volume but the recovery economics are similar per gram of CO2 captured. The environmental benefit is significant: CO2 is a greenhouse gas 27× more potent than methane on a 100-year timescale, and the brewing industry is under increasing pressure from sustainability certification frameworks to minimise venting.

Capital cost of a full CO2 recovery system at small craft brewery scale (< 5000 hl/year) is approximately €120,000–€350,000, with payback periods of 3–7 years depending on local CO2 purchase price and production volume. Several NA craft breweries (including Lucky Saint in the UK and Nirvana in London) use CO2 recovery as a sustainability credential, contributing to B Corp or carbon neutral certification pathways.

Recovery stage	Function	What's removed
Collection hood + foam trap	Capture CO2 at source	Beer foam entrained in gas
Water scrubber	Remove water vapour	Moisture
Activated carbon filter	Remove off-flavour compounds	H₂S, acetaldehyde, terpenes
Compression + liquefaction	Store CO2 as liquid	—

Sustainability in NA brewing production — including CO2 recovery, water use, and carbon footprint — is covered in the zeroproof.one NA beer guide.

How do breweries recover and reuse CO2 from fermentation in non-alcoholic beer production?

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