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Case Study

Plant upgrade design advances leachate treatment for North American waste service provider

Every Challenge Has a Backstory

A large waste service provider in North America runs a landfill in the northeast that sends pretreated water to a city wastewater treatment plant before discharge into a local river. Due to a planned landfill expansion to support regional community and disposal needs, the waste service provider needed to upgrade its treatment system to expand its leachate treatment capacity from 80,000 to 300,000 gallons per day.

In addition, as more treatment municipalities are working to control the release of disinfection byproducts to help protect the environment, upgrading from chlorine to ultraviolet (UV) disinfection has become a preferred practice. As the city recently made this upgrade, the service provider also needed to improve UV transmittance of its leachate to mitigate impacts on the city’s new wastewater disinfection capabilities and ultimately improve the quality of water discharged to the river with respect to nitrogen-based nutrients.

OBG’s Focus on Solutions

OBG’s solution included design, construction, and permitting for a new leachate treatment facility with a sequencing batch reactor (SBR) biological system for the removal of ammonia and reduction of chemical oxygen demand (COD). As part of the upgrade, a reverse osmosis (RO) system was implemented for effective and sustainable treatment of landfill leachate. A proprietary membrane system was selected that allowed for direct feed from the SBR without need for additional micro-filtration and conditioning.

Results that Matter

The project cost-effectively met the waste service provider’s intended expansion needs and permit limits. The project also provided effluent with acceptable UV transmittance that would not impact the city’s disinfection capabilities. In addition, waste from the RO system was returned to the landfill through existing solidification processes on site for cost-effective disposal.