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Case Study

New leachate pretreatment facility improves water quality for Rhode Island

Every Challenge Has a Backstory

The Rhode Island Resource Recovery Corporation (RIRRC), which handles most of Rhode Island’s municipal waste and recycling, needed to design and build a 0.650-mgd treatment plant to comply with projected changes in the discharge standards for disposal of wastewater, including leachate, into a public sewer system. Specifically, the new facility needed to pretreat landfill-related leachate from RIRRC’s Central Landfill to help the RIRRC comply with projected changes in nitrogen-discharge standards set by the Rhode Island Department of Environmental Management (RIDEM) for the disposal of wastewater. 

OBG’s Focus on Solutions

OBG, partnered with Carlin Contracting, Co., Inc., designed and built a $27 million, state-of-the-art leachate-pretreatment plant that treats wastewater generated by the landfill before it is released into the public sewer system. The treatment process was designed with sequencing-batch reactor technology that could process up to 650,000 gallons of wastewater a day, reducing biochemical oxygen demand (BOD), total suspended solids, ammonia, and nitrate, to comply with enhanced nutrient removal pretreatment standards.

In addition to design of the facility, OBG obtained regulatory permit approvals, designed the integrated instrumentation and control SCADA system, and performed commissioning and operational startup services.

Results that Matter

The new plant is allowing for more environmentally friendly processes, advancing regulatory compliance, and saving money by treating the leachate at the source. The overall project will improve water quality by reducing the BOD and the nitrogen load discharged from RIRRC to publicly owned treatment works located downstream. With sustainability in mind, the project is designed to LEED Silver standards and with architectural details to reduce consumption of natural resources.

See this project featured in the Water Design-Build Council.