West Richland, WA – Wallace Group served as prime consultant for design and construction of an industrial process wastewater treatment facility (IPWTF) to accommodate the existing and proposed winery facilities in the area surrounding the City of West Richland in Washington State. Winery wastewater is characteristically high in strength, with BOD levels on average of 5,000 mg/L and up. Smaller municipal treatment plants cannot support high strength peak loads from winery waste. The IPWTF is designed to support multiple production facilities with a total capacity of up to 750,000 cases annually.

Wallace Group was asked in 2014 to provide expertise in the field of high strength wastewater treatment as the City was investigating alternatives for winery waste treatment. An initial feasibility study was performed and submitted to the client. Through this initial phase of work the City recognized the value of Wallace Group’s knowledge and decided to retain Wallace Group to act as prime consultant for the design and construction. The process wastewater facility was designed to receive raw industrial process wastewater from existing and proposed local wineries by a gravity collection system to the site. The process treatment system includes an influent lift station and a biological treatment facility to pretreat winery wastewater flows. Harvest period average flow capacity of the system is estimated at 50,000 gallons per day, with peak flows up to 75,000 gallons per day. Effluent from the treatment facility will be discharged to the City’s municipal treatment plant for final treatment and disposal. Effluent equalization and off-peak management of effluent were included in the facility design.

Wallace Group’s scope included site grading and drainage design, site plan, composite utility plans, project management, storm water control plan, and coordination of five subconsultants including structural, architect, geotechnical, HVAC, and electrical. Wallace Group worked closely with the treatment system manufacturer to design a custom, prepackaged turnkey membrane bioreactor system. The treatment system design intentionally minimized the overall site improvements necessary for implementation, which kept overall costs low, while maintaining flexibility and reliability of the plant as a whole.


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