GEA targets higher gravity brewing efficiency

GEA has begun an integrated brewing research programme intended to extend the practical limits of producing higher-gravity wort in commercial brewhouses.

The SUD-2030 project combines milling, mashing, and lautering within one development programme rather than optimising each stage independently. Work will progress from laboratory investigation through pilot trials to a demonstrator operating under near-industrial conditions.

Higher-gravity brewing produces a more concentrated wort that can be diluted later in the process. Carrying less water through the hot side allows breweries to reduce the volume requiring heating, pumping, cooling, treatment, and vessel capacity for each unit of finished beer.

Conventional lautering systems can reach practical limits as wort concentration rises, since flow resistance through the grain bed increases while separation becomes slower and less predictable. Attempts to accelerate the cycle can reduce extract recovery, clarity, or consistency.

GEA is examining how grist condition and mash development influence the later separation stage. Particle-size distribution, husk integrity, starch conversion, mash viscosity, temperature, and mixing history all affect how readily liquid wort can pass through the spent-grain bed.

Brewhouse stages operate as one system

Lautering has a direct effect on brewery economics because it determines extract yield, batch duration, wort quality, and the amount of hot-side capacity available each day. A slow separation cycle can become the production bottleneck even where fermentation, filtration, and packaging retain spare capacity.

Connecting milling, mashing, and lautering allows engineers to assess whether an adjustment in an earlier stage improves the complete brewhouse cycle. A milling setting that appears less efficient in isolation may create a more permeable grain bed and reduce total processing time.

The project is being developed at GEA’s Kitzingen operation with scientific support from the Technical University of Munich and other Bavarian research partners. Funding is being provided through the Bavarian Transformation and Research Foundation.

Breweries continue to face pressure to reduce heat and water consumption across mashing, boiling, cooling, cleaning, fermentation, filtration, and packaging. Water entering the plant as a utility often exceeds the volume leaving in the finished product, particularly where cleaning and cooling systems have not been modernised.

Process concentration offers a different route from simply replacing individual motors, burners, or pumps. When less water moves through the hot side, energy demand can fall across several connected operations, although the saving depends on how dilution and downstream handling are managed.

Higher-gravity wort can also increase effective production capacity within an existing building because more finished beer is produced from the same vessel volume. That may allow a brewery to defer major civil expansion, provided that fermentation, dilution, flavour control, and packaging remain aligned with the more concentrated process.

Raw material variability will test the stability of the approach, since malt changes between crop years, varieties, suppliers, and storage conditions. High-solids mashes can respond more sharply to differences in protein, modification, moisture, and husk quality than conventional brewhouse recipes.

Automation will therefore need to distinguish between ordinary raw material variation and a developing process fault. Flow, differential pressure, turbidity, extract, temperature, and rake position can provide useful information, but only when instruments remain accurate and control logic responds without creating unstable corrections.

The expansion of Irish brewing capacity for established and no-alcohol brands illustrates the continuing demand for greater output from European brewing infrastructure. Higher-gravity processing offers one route to additional volume without increasing water, energy, and building requirements at the same rate.

Laboratory behaviour will not necessarily translate directly into a commercial lauter tun, where scale changes grain-bed depth, compression, liquid travel distance, heat distribution, pump characteristics, and the time available for each stage. Pilot and demonstrator work will therefore determine whether the gains survive under industrial loads.

Cleaning performance must be evaluated alongside throughput, since more concentrated and viscous material can increase fouling, residue retention, and cleaning demand. A process that saves water during production could lose part of that benefit if equipment requires longer or more intensive cleaning cycles.

Spent-grain handling also has to remain stable. Changes in moisture content, bed structure, or discharge behaviour can affect conveyors, storage, transport, and the value of the residue supplied into animal-feed or other recovery routes.

GEA intends to transfer the findings gradually into industrial applications after the laboratory, pilot, and demonstrator stages. That sequence should reveal whether the integrated concept delivers a genuine system-level improvement rather than a theoretical gain limited to one operating condition.

Extract yield, batch time, wort quality, cleanability, and utility use per hectolitre will provide the decisive measures. If those indicators remain stable at commercial scale, integrated high-gravity design could support smaller brewhouses, greater output, and lower resource demand without shifting the constraint elsewhere in the plant.