Port of Sunnyside - Waste Water Treatment

Wastewater Treatment

In order to engender economic development in the vicinity of Sunnyside, Washington, the Port of Sunnyside commenced the operation of its Industrial Wastewater Treatment Facility in the 1970's. At that time, the system consisted of an aerated lagoon and a land application system. Food processing industry wastewater was received into the lagoon, aerated to minimize odor, and then discharged to alfalfa as irrigation water. 

In the 1990's, a storage lagoon was added to the IWWTF. With a forty acre footprint, and a total storage volume of nearly 150 million gallons, this lagoon allows treated wastewater to be stored during the winter. The stored water is discharged to fields of alfalfa during the growing season. 

Before the addition of the storage lagoon, two earthen basins provided short-term storage for influent flows that exceeded the capacity of the aerated lagoon. Also in the 1990's, these earthen basins were combined into a single lagoon. As part of this project, both the original lagoon, and the new combined lagoon were lined in order to prevent leakage to groundwater. Improved wastewater treatment was provided by adding aeraton to the new combined lagoon.

Sequencing batch reactors (SBR's) were brought online in 2005. The SBR's provided enhanced treatment of food processing wastewater. This enhanced system enabled the discharge of 550,000 gallons per day of treated water to a tributary of the Yakima River. This discharge to surface water was permitted from the beginning of October through the end of June. During the summer, the SBR effluent was discharged to the storage lagoon, and land applied along with the additional wastewater that was processed through the lagoon system.

The new anaerobic pretreatment system is now up and running. This pretreatment system will increase the treatment capacity of the SBR's from 550,000 gallons per day to 1.1 million gallons per day. A new National Pollutant Discharge Elimination Permit (NPEDS) allows the discharge of the SBR effluent to surface water for the entire year.




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