Sludge. Itâs not exactly super sexy, but what you do with it is important.
Brewing creates three main organic waste streams: malt, hops and yeast.
Our spent malt already gets repurposed as animal feed (and occasional crackers and dog biscuits), but sludge (the thick slurry of leftover hop material and yeast) has historically been a trickier problem to solve.
For a long time, we collected it in tanks, but it still ended up being trucked to landfill as liquid waste. Not great.
Enter: The Sludge Tank.
In 2024, funding from the Wellington City Council Waste Minimisation Seed Fund - Organics Diversion Fund allowed us to build a proper system, designed by our own Steve Almond (Sustainability & Projects Manager) in collaboration with EnviroNZ. Sludge is now pumped from our fermenters into a holding tank, collected by EnviroNZ, and composted by Capital Compost, turning it into potting mix and soil for public use.
The impact? đ± 60+ tonnes of organic waste diverted from landfill per year đ± 5+ tonnes of CO2 emissions prevented
Very cool, very satisfying. End of story, right?....Wrong! After 8 months of doing this, we noticed something⊠the sludge smells incredible! Concentrated hop aroma, bright, fruity, punchy. Too good to compost, and you know that here at Garage Project, we're always wondering if things can be made into beer, and this sludge was no different. We gave hope a chance, and we are so thrilled to announce that our recycling experiment was a delicious success!
Introducing:
Sludgefest, Radical Recycled Hop IPA - 9.5%
This tasty beer is brewed by giving those leftover dry hops a second life before they make their noble exit to compost. Multiple doses of leftover dry hop âsludgeâ, still loaded with hop aroma and flavour, pumped straight from other beers into this tank of Sludgefest making it technically our most heavily hopped beer ever. Wasteâs only waste if you waste it, and, trust us, You wonât want to waste a drop.
Artist:
@gwilart