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Success Stories SUCCESS STORIES PLANT NAME AND LOCATION YORK RIVER TREATMENT PLANT (HAMPTON ROADS SANITATION DISTRICT) - YORK RIVER, VA DESIGN DAILY FLOW / PEAK FLOW 0.5 MGD (1893 M3/DAY) / 0.5 MGD (1893 M3/DAY) AQUA-AEROBIC SOLUTION SINGLE-BASIN AquaSBR® SYSTEM, 4-DISK AquaDisk® FILTER AQUA-AEROBIC TECHNOLOGIES CHOSEN FOR FIRST MUNICIPAL- INDUSTRIAL WATER REUSE PROJECT IN VIRGINIA! Hampton Roads Sanitation District (HRSD) was created in 1940 to reduce pollution in the Chesapeake Bay. It currently serves a population of approximately 1.6 million with nine regional wastewater treatment plants in Hampton Roads and four smaller plants on Virginia’s Middle Peninsula. HRSD set the goal to reuse its treated wastewater for nonpotable purposes in the 1980s. An oil refi nery located next to their York River Treatment Plant (YRTP) approached HRSD in 1996 to supply reclaimed water for the refi nery’s cooling and process water. Previously, the refi nery utilized increasingly expensive potable water and upgrading its own treatment facilities was too large an investment. In December 2000, HRSD signed a 20-year agreement to provide the refi nery with 0.5 MGD of reclaimed water. This was Virginia’s fi rst municpal-industrial water reuse project! York River’s AquaSBR® basin in operation. Since the existing activated sludge treatment process at water can be fed to the AquaDisk fi lter from either the full- HRSD’s York River Treatment Plant couldn’t reliably meet the scale plant effl uent or the sidestream AquaSBR system. refi nery’s special target requirements for both low turbidity and year-round ammonia concentration, other treatment HRSD sells the reclaimed water to the refi nery at cost, processes had to be investigated. HRSD fi rst investigated to recover only the additional investment of building and fi ltration technologies for enhanced solids removal. Following operating the sidestream treatment and fi lter. The total cost a pilot study in 1998, they installed a 4-disk AquaDisk® cloth of the reclaimed water over the 20-year agreement period media fi lter. HRSD chose the AquaDisk cloth media fi lter over is approximately half that of potable water. Not only does a sand media fi lter because of its footprint and operational this reuse partnership save the refi nery money and provide advantages. HRSD then researched several secondary a drought-proof water source, it also conserves natural treatment processes and decided to install a single basin resources and reduces nutrients otherwise released into AquaSBR® system fed with primary clarifi er effl uent to the York River, and ultimately into the Chesapeake Bay. produce year-round biological nitrifi cation. The AquaSBR The partnership has also led to the receipt of two awards: was chosen for its reliablilty and cost-effectiveness. The the WateReuse Association’s national “Project of the Year” reclamation operation began in July 2002 and the reclaimed (2003) and “Honors Award for Engineering Excellence” water quality has always been better than originally required. (2004) from the American Council of Engineering Companies The reclaimed water system is designed so that fully treated of North Carolina. www.aqua-aerobic.com 815.654.2501 AquaSBR® SYSTEM PROCESS Since the start-up of York River’s side stream process, the AquaSBR system and AquaDisk fi lter have consistently The AquaSBR system operates on a simple concept of produced reclaimed water that is higher quality than what was introducing a quantity of waste to a reactor, treating the waste required at the time of the reuse agreement in December 2000. in an adequate time period, and subsequently discharging a volume of effl uent plus waste sludge that is equal to the AVERAGE ANNUAL OPERATING DATA original volume of waste introduced to the reactor. This “Fill and Draw” principle of operation involves the basic steps of Fill, DESIGN AVG DESIGN RECLAIMED LOADING React, Settle, Decant, and Sludge Waste. The system may be INFLUENT INFLUENT EFFLUENT EFFLUENT designed to include seven individual phases of operation but AVG Flow mgd 0.5 ---- 0.5 0.46 the inclusion or duration of any individual phase is based upon specifi c waste characteristics and effl uent objectives. Peak Flow mgd 0.5 ---- ---- ---- COD mg/l 450 ---- 40 31 Where nutrient removal is required, a simple adjustment to the TSS mg/l 120 93 < 10 < 1 SBR’s operating strategies permits nitrifi cation, denitrifi cation, and biological phosphorus removal. Optimum performance NH3-N mg/l ---- 23.3 < 2 0.4 is attained when two or more reactors are utilized in a Total P mg/l 5 5 < 2 1.3 predetermined sequence of operation. NTU mg/l ---- ---- < 5 0.6 AquaDisk® FILTER PROCESS ® Clarifi ed effl uent from the activated sludge system enters AquaSBR SYSTEM ADVANTAGES the fi lter and fl ows by gravity through the cloth media of the • Tolerates variable hydraulic loads stationary hollow disks. The fi ltrate exits through the hollow shaft which supports the individual disks and fl ows to the • Tolerates variable organic loads effl uent channel. • Controls fi lamentous growth As solids • Provides quiescent settling accumulate on the surface • Separation of aeration and mixing of the media, • Lower installation costs the water level • Return activated sludge pumping eliminated surrounding the disks rises. Once • Small footprint a predetermined • Simple to expand or upgrade level is reached, the disks • One company accountability ® 4-disk AquaDisk fi lter located inside a small rotate and the building at the York River Treatment Plant. media surface is AquaDisk® FILTER ADVANTAGES automatically vacuum backwashed clean. Heavier solids settle to the bottom of the tank and are then pumped to a digester or • Consistent, high quality effl uent to the plant headworks. • Lower backwash rates • Tolerates extreme variations in loads DESIGN CHARACTERISTICS • Reuse quality effl uent The single basin AquaSBR system produces biological • Continuous fi ltration during backwash nitrifi cation for the sidestream treatment process prior to entering the cloth media fi lter. The 4-disk AquaDisk fi lter • Minimal operator attention produces reuse quality effl uent for discharge to the oil refi nery • Minimal maintenance for its cooling and process water purposes. • Small footprint • Eliminates sand media and underdrains © 2011 Aqua-Aerobic Systems, Inc. www.aqua-aerobic.com 815.654.2501.
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