Graduate Project

 

Monitoring a wetland wastewater treatment system at Cannon Beach, Oregon Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_projects/4x51hj75m

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  • Since 1984, the city of Cannon Beach has used a 7 ha, two-cell red alder/twinberry/slough sedge palustrine wetland to treat chlorinated effluent from a four-cell aerated/facultative lagoon system. For three years effluent has met summer wastewater discharge limitations (10 mg/L BOD5 and 10 mg/L TSS). Field research in 1986 concerned vegetation ecology, hydrology, and water quality to develop monitoring procedures for improved wastewater wetland management. After three years operation, a complex pattern of vegetative flooding stress is observed. Nested frequency plots (155, 50 x 50 cm within 100 x 100 cm) provide baseline data for vegetation trend assessment. Average 1986 wetland influent and effluent flow rates were .40 and .06 MGD respectively. An independent water budget estimate suggests ground water infiltration is at least 65-85% of the water loss. BOD5 and TSS influent concentrations are reduced approximately by 40% and 85% respectively. Predictions are made for successional trends as a function of hydroperiod and microtopography.
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