Eugene/Springfield Water Pollution Control Facility 1984-1991

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Section E: RESIDUALS MANAGEMENT FACILTTIES OPERATIONS SLUDGE ~'~`~`~~~ ~~~~~~ MANAGEMENT ~_s:. "~'~~~~ `~'~ `~ FACILITY ~iiY~ `FF::::.. FACULTATIItE LAGOONS 1NG EDS DESIGN SCHEMATIC AND SPECIFICATIONS 4 Facultative sludge lagoons lagoon loading sludge storage volume lagoon depth volatile destruction harvest sludge solids Air drying beds paved and sealed 6.25 acres each 251b VS5, i,ooo sq ft/day 74 acre-ft 13.5 ft 40% 4.63'0 24 acres • Supernatant Pump Station The supernatant pump station provides 800-gpm pumping capacity to return facultative sludge la- goonsupernatant tothe sanitary sewer system. The discharge system is a gravity flow system consisting of approximately 1.5 miles of 10-inch-diameter pipe, which discharges into the sanitary sewer system. Supernatant flows through the gravity sys- tem at arate of .45 MGD or is pumped at a rate of 1.14 MGD. • Harvested Sludge Storage Tank and Pump Station The harvested storage tank and pump station handles the liquid sludge application to agricul- turalland.The harvested sludge storage tank has a 50,000-gallon capacity to hold stabilized sludge that is dredged from the lagoons. Two, 900-gpm loading and circulating pumps mix sludge in stor- agetanks andfillhauling tankers with liquid sludge. Page 41 • Dried Sludge Storage Building The dried sludge storage building can store 3,000 cubic yards of dried sludge. Dried sludge that is removedfrom the airdryingbeds canbe storedon- site for convenient loading and pickup by the public. • Operations Building The Residuals Management staff works from the Operations Building located on site. The building consists of a maintenance shop, lunchroom/train- ing room, locker room and showers, computer work station, and the supervisor's office. Phase 1 components of the program are still avail- able if needed and are located at the regional treatment plant. Those facilities consist of a 2.5- acre surface area sludge storage lagoon (with a capacity of eight million gallons) and the centri- fuge thickening and dewatering facility. The cen- trifuge facility consists of two, solid-bowl centri- fuges with the capacity to thicken or dewater sludge volumes up to 400 gpm. Several modes are available to thicken or dewater digested sludge, lagoon sludge, or waste activated sludge. The facil- ity has both liquid and dry polymer systems for sludge conditioning in the centrifuge operation and maintains grinders, pumps, and a sludge hold- ing tank that stores liquid sludge. FUNCTIONAL RESPONSIBILITIES The Residual Management staff is responsible For operating the SMF (site processes and agricultural land application) in accordance with all DEQ and EPA permit requirements and operational guide- lines andforconductingalloperations inamanner that will optimize the use of sludge as a soil condi- tioner. Staff from both the SMF and the regional treat- mentplant work closely to ensure efficient opera- tion at both facilities. This cooperation includes close communication with the Plant Operations staff concerning work activities, such as digester cleaning and sludge lagoon decanting. Chemical, biological, andphysical laboratory analyses of sludge and water samples are scheduled and coordinated with the plant laboratory. In addition, corrective and preventive maintenance for site equipment and facilities must be scheduled with the equip- ment maintenance and the facility maintenance work sections.