Editor’s Note: This post was originally published in 2015 and has been updated for comprehensiveness.
With a fleet of 250 tanker trucks—35 of which are used to haul soybean oil—one U.S.-based trucking company is dedicated to thoroughly cleaning its large fleet following transportation jobs. The oil tankers can each haul approximately 48,000 pounds of oil, so when cleaning the tanks, a significant amount of residual oil often mixes with the wash water.
As is common practice in many municipalities, local regulations require the trucking company to remove all residual oil from the wastewater before allowing the wastewater to be discharged into the city sewer system. When the trucking company reassessed their process for doing so, they found glaring inefficiencies.