A Montana town has found a money-saving solution to its sewage and wastewater treatment expenses, thanks to a nearby craft brewery. The innovation caught the eye of the Environmental Protection Agency (EPA), which provided the town and its water reclamation facility an Honorable Mention accolade in one of the federal agency’s annual awards.
Havre, Montana has a population of 10,000. Its 40-year-old water reclamation facility, as the EPA has described, “needed upgrades to help meet their final ammonia and residual chlorine limits,” while processing more than 6 million gallons of water.
Unfortunately, with more than 10 breweries nearby, the wastewater generated further increased because beer waste is “rich in yeast, hops and sugar.” These contents are known to skew the microbial activity process that removes both nitrogen and phosphorus from the water as it is being treated. In short, if nitrogen and phosphorus are not removed before the treated water enters the drain-off into estuaries, then bacterial and algal blooms will arise. These unwanted blooms would disturb an estuary’s water chemistry enough to adversely affect the ecosystem.
Engineering consultant Coralyn Revis offered a paradigm shift to solve the issue. “If we can use [brewery waste] correctly and put it in the right spot, it’s very beneficial to the process,” Revis said. “This is super-simplified, but like, if they’re eating their french fries, they need a little ketchup with it. So to get the nitrate out, you dose a little carbon, and the bugs are happier.”
Havre’s wastewater plant manager, Drue Newfield, sought Michael Garrity, Triple Dog Brewing Company’s owner, to source leftover barley for feeding the water treatment microbes. The spent barley was used as a substitute for the chemical alum, an aluminum-sulfate solution. The joint endeavor saved the community from investing an additional $1 million in upgrades to the water treatment plant.
“To further enhance the biological phosphorus removal process, 10 gallons of waste barley mash from a local brewery gets added daily as an external source of carbon and volatile fatty acid supplement,” the EPA explained. “These improvements have allowed the facility to continuously meet all permit effluent limits and has significantly improved the operability, reliability and treatment capability of the facility. These upgrades have greatly improved the quality of wastewater effluent discharged to the Milk River, particularly with respect to nutrient levels and ammonia toxicity.”
The endeavor has been federally acknowledged as a creative and successful example for integrating community involvement at solving water quality infrastructure challenges in four key areas: public health, economy, sustainability and innovation.
Image via Manfred Richter