CITY OF WOODBURN LAND-APPLIES LIQUID AND DEWATERED BIOSOLIDS, FACULTATIVE SUDGE LAGOON SUPERNATANT, AND EFFLUENT ON HYBRID POPLAR TREES

摘要

The City of Woodburn, Oregon, designed and installed a 34-hectare (ha) (84.1-acre) poplarrnplantation to beneficially reuse wastewater treatment plant effluent, biosolids, and supernatant.rnThe City chose this approach as a cost-effective and environmentally attractive method ofrnreducing effluent discharges to the Pudding River in the summer when the total maximum dailyrnload restriction for ammonia is most stringent. Consequently, in July and August, the treatmentrnplant pumps 5,034 cubic meters per day of effluent (m~3/day) (1.33 million gallons per dayrn(mgd)) to a poplar plantation instead of the Pudding River. In the final development phase, this isrnexpected to increase to 11,393 m~3/day (3.01 mgd) irrigating 300 acres.rnThe overall system monitoring and management program was developed based on OregonrnDepartment of Environmental Quality guidelines for land application of municipal effluent andrnbiosolids. Irrigation scheduling is based on National Pollutant Discharge Elimination Systemrnpermit requirements. Nutrient loading is based on agronomic requirements of the trees and therntotal nutrients available from the reused waste streams.rnThe capital cost estimate for the 320 acre reuse farm and all reuse equipment is $4,610,000. Thernoperations and maintenance cost per year is approximately $120,000. This paper demonstratesrnthat automated irrigation management and scheduling for a poplar tree plantation is anrninnovative, cost-effective method of wastewater management that protects public health byrnenhancing water quality and the environment. It also demonstrates that a reuse farm sized forrneffluent use can also consume all of the biosolids and supernatant produced at the WWTP.