Wastewater disposal for large breweries, mid-sized establishments, and even small craft brewers, remains a significant environmental and economic challenge. Recently, the oldest brewery in America received an unpleasant reminder of this fact.
D.G. Yuengling and Sons, Inc. was issued a complaint from the U.S. Environmental Protection Agency (EPA) alleging that Yuengling violated its discharge permit standards at least 141 times between 2008 and 2015. Yuengling holds an Industrial User (IU) permit that allows it to discharge wastewater to the publically owned treatment works (POTW), but only after it treats its discharge to limits set in its permit. Treatment of wastewater before discharge is known as, “pretreatment.” For brewers like Yuengling, pretreatment largely involves balancing pH levels and minimizing Biological Oxygen Demand (BOD) (a measure of how easy it is for microorganism at the POTW to breakdown organic materials) and Total Suspended Solids (TSS) (a measure of how much particulate material is in wastewater). High levels of BOD and TSS make it difficult for the microorganism at the POTW to do its job of breaking down organic matter and sludge. The remnants from the brewing process such as yeast, sugars, and proteins all elevate both BOD and TSS.