Spent Grain & Trub

Did you know?

Breweries can produce 14‑20kg of spent grain and 0.2‑0.4kg of trub for every barrel of beer produced.

Where Does it Enter the Drain?

Most spent grain and trub enters the drain during the emptying and rinsing of the brewhouse equipment.

How to Keep it Out of the Drain

Investigate use of rigid stainless steel screens and other procedures to prevent coarse grains and other solids from hitting the floor.

Stainless Steel Drum Filter
Stainless Steel Drum Filter

If it does hit the floor, sweep it up and put in a solid waste tote or feed bin.

Stop “chasing” solids around the floor and into the drain – contributes to over-strength wastewater AND increases water use and therefore wastewater volume.

Hoses aren't Brooms

What to Do With It

Mix captured solids in with grain for farmer.

(Don’t forget – bitterness of trub can limit appeal to livestock, so do a test with the farmer to see what percent of trub can be tolerated.)

Spent Grain Into Hopper
Spent Grain Into Hopper (Source: Sawdust City Brewing Co.)

Divert to a composter and/or biodigester.

Dispose as solid waste.