Their challenge

Process wastewater from manufacturing sites can be high in organic content. A measure of this organic content is biological oxygen demand (BOD). Food and beverage facilities often have high BOD levels in their wastewater streams when product is sent to drain or during rinsing steps of the clean-in-place (CIP) process.

When the City of Phoenix adopted new regulations to limit wastewater with high BOD content, our client struggled to meet those limits. As a result, the plant was paying large monthly surcharges.

Our solution

Salas O’Brien provided a conceptual study of the BOD sources throughout the facility, and six key areas were identified as major contributors. This led to a detailed engineering project to design and upgrade automated by-product capture and recovery systems. The systems include a modified package-shredding conveyor and two hygienic tank systems to capture and store the by-product. To improve pH and solids monitoring, the design uses upgraded temperature controls with a frigid water heat exchanger, instrumentation, and an effluent pit pulsed air mixer.