Latest / The Operations Podcast with Fexingo: Process, People, and Profit in Modern Business / How a Brewery Cut Water Use by 60 Percent with Closed-Loop Operations
Transcript
- Lucas: Luna, I've got a number that stopped me cold this week. The average craft brewery uses seven gallons of water to make one gallon of beer. Seven to one. And most of that water never touches the product — it's for cleaning, cooling, and rinsing. Luna: That's a staggering ratio. Especially when you think about places like Portland or Denver, where water isn't exactly cheap, and customers care about sustainability. Lucas: Exactly. So today we're looking at a mid-sized brewery in Portland — they do about 80,000 barrels a year — that decided to tackle that ratio head-on. Over eighteen months, they went from 7:1 down to under 3:1. That's a 60 percent reduction in water use. Luna: And I'm guessing it wasn't just installing low-flow faucets. What were the big operational changes? Lucas: Three main moves. First, they retrofitted their heat exchangers. In a brewery, after you boil the wort, you have to cool it down quickly before fermentation. That cooling uses a massive amount of water — once-through, straight to the drain. They installed a plate heat exchanger with a recirculation loop. Now the same cooling water is reused, and they only lose about 5 percent to evaporation. Luna: So the water does its job, gets cooled back down, and goes around again. That's a classic closed-loop principle. Lucas: Exactly. The second move was cleaning in place — CIP — optimization. Breweries run CIP cycles on every tank after each batch. Traditionally, those cycles are timed generously — say, 45 minutes of hot caustic solution, then a hot water rinse, then a sanitizer rinse. The team installed flow meters and conductivity sensors on the CIP return lines. Now they stop each rinse as soon as the return water is clean, not after a fixed timer. Luna: Meaning they cut rinse water by about 40 percent, I'm guessing. Because they're not just guessing the endpoint. Lucas: Right. The third change was real-time monitoring across the whole facility. They installed sub-meters on every major water-using asset — the mash tun, the lauter tun, the kettle, the heat exchanger, the CIP skids. That data goes to a dashboard the brewers check daily. Luna: So they could see, hey, the lauter tun is using 20 percent more water this week than last, and then investigate. Lucas: Exactly. And that's where the real savings came from. Within the first three months, they found a leaking valve on the hot water tank that was wasting 2,000 gallons a day. That leak would have gone unnoticed without the sub-metering. Luna: The low-hanging fruit is often invisible until you measure. So what was the total investment, and what did they save? Lucas: The whole project cost about $350,000 — heat exchanger retrofit, sensors, meters, a new PLC for the CIP system. Annual savings: about $120,000 on water and sewer fees, plus another $40,000 on energy because they're heating less water. So payback was just under two years. Luna: And that's before you factor in any brand value. Portland drinkers will absolutely choose the brewery that's water-conscious over the one that isn't. Lucas: The brewery actually ran a 'one gallon of beer, three gallons of water' campaign on their cans. Sales in their home market went up 8 percent the following quarter. Not huge, but not nothing. Luna: That's a nice validation. So what's the takeaway for someone in a completely different industry — say, a food processing plant or a textile mill? Lucas: The principles transfer. First, measure before you manage — sub-metering is almost always worth the investment. Second, look for one-through flows and see if you can close the loop. Third, optimize your cleaning cycles with sensors instead of timers. Anywhere you have a repetitive cleaning step, there's water being wasted. Luna: And it's not just water. If you're heating that water, the energy savings can be significant too. It's a double win. Lucas: The brewery also published a case study showing their carbon footprint dropped by about 300 tons of CO2 per year from reduced natural gas use. So it's a triple win — water, energy, emissions. Luna: That kind of story is why we do this show. We get to dig into real operations, not just theory. Lucas: And it's also why we keep the show ad-free. If these episodes help you think differently about your own operations — even in a small way — then it's working. And if you want to support that, the link is buy me a coffee dot com slash fexingo. Luna: Yeah, it's a simple way to keep this going. No pressure, just if you find value. Lucas: Back to the brewery — one last detail. They're now working on capturing the steam from the kettle boil and condensing it back into hot water. They estimate that could save another 10 percent. Luna: So the journey doesn't stop at 3:1. They're aiming for 2:1 eventually. Lucas: Exactly. And that's the operations mindset — continuous improvement, one loop at a time.