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Cyclical Nitrification — Denitrification Provides Flexible Nutrient Removal for Silverton, Oregon

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During April through November, the City of Silverton's WWTP supplies water to mitigation wetlands that have been constructed in the heart of a 200-acre botanical garden. Water from the wetlands is then used to irrigate the ornamental plantings. Effluent quality criteria for discharge to the wetlands governed design of a new treatment process. The new NPDES permit for the plant requires monthly-average BOD, TSS and ammonia-nitrogen limits of 10, 10 and 3 mg/L, respectively. While no permit limit is established for nitrates, the City has established a goal of 10 mg/L to minimize potential impacts to groundwater resulting from seepage through the wetlands.

Document Type: Research Article


Publication date: 2000-01-01

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