Dissolved air dissolved air flotation plant RT series

Overview
Evoqua offers three rental Dissolved Air Flotation (DAF) units in different sizes designed to remove total suspended solids (TSS), biochemical oxygen demand (BOD), and fats, oils and greases (FOG) from industrial and municipal wastewater streams. RT Rental DAF systems use a dissolved air-in-water recycle stream to create micron-sized bubbles that attach to contaminants; bubbles and contaminants rise to the surface for removal by a skimmer while heavier solids are removed by a bottom auger.

Common applications

• Product recovery and reuse
• Pretreatment to meet sewer discharge limits
• Pretreatment to reduce loading on downstream biological treatment systems
• Polishing of biological treatment effluent
• Thickening of biosolids

How it works
A recycle stream of clarified DAF effluent is pressurized with air, then combined and mixed with incoming wastewater in an internal contact zone. As the dissolved air comes out of solution it forms micron-sized bubbles that attach to solids and other contaminants. The bubble-contaminant agglomerates float to the surface and form a floating bed that is removed by a surface skimmer into an internal float hopper for handling. Heavier solids settle and are conveyed by a bottom auger to a settled solids discharge.

Key features

• Complete, skid-mounted design for quick, easy installation
• Rugged 304/316 stainless-steel tank design (corrosion resistant, minimal flexing)
• Integral flocculation tube with three chemical injection ports for coagulant/flocculant dosing and mixing
• Safe, simple, low-maintenance design (no plate-packs required)
• Completely pre-wired NEMA 4X control cabinet; single 460V/3ph power drop to operate
• Industry-leading HELLBENDER® whitewater system (no external air source required)
• Variable speed skimmer drive
• Large internal float hopper to minimize pumping requirements; optional float level sensor for automatic sludge pumping
• Automated settled solids auger
• Quality drive and pump components selected for long-term reliability

Available models and primary specifications

• RT-50A
  • Overall dimensions (L x W x H): 15'‑7" x 6'‑4" x 7'‑2"
  • Shipping weight: 5,100 lbs
  • Operating weight: 16,300 lbs
  • Effluent flow: 90 gpm nominal / 200 gpm max
  • Pressure: Gravity
  • Electrical: 460V / 3 phase / 60 Hz / 31 FLA
  • Optional pump: 3 HP–10 HP (depending on sludge volume/characteristics)
  • Service connections (Inlet / Out / Float): 6" / 6" / 4" - 150# Flange
  • Settled solids discharge: 4" flange
  • Recycle pump: Hellbender HB-90, 15 HP
  • Active surface area: 57 ft²
  • Nominal water volume: 1,260 gallons
  • Float hopper capacity: 100 gallons
• RT-100A
  • Overall dimensions (L x W x H): 20'‑7" x 8'‑5" x 8'‑2"
  • Shipping weight: 8,000 lbs
  • Operating weight: 33,300 lbs
  • Effluent flow: 200 gpm nominal / 400 gpm max
  • Pressure: Gravity
  • Electrical: 460V / 3 phase / 60 Hz / 31 FLA
  • Optional pump: 3 HP–10 HP (depending on sludge volume/characteristics)
  • Service connections (Inlet / Out / Float): 8" / 8" / 6" - 150# Flange
  • Settled solids discharge: 4" flange
  • Recycle pump: Hellbender HB-90, 15 HP
  • Active surface area: 101 ft²
  • Nominal water volume: 1,260 gallons
  • Float hopper capacity: 170 gallons
• RT-240A
  • Overall dimensions (L x W x H): 33'‑3" x 10'‑5" x 9'‑8"
  • Shipping weight: 14,100 lbs
  • Operating weight: 83,300 lbs
  • Effluent flow: 480 gpm nominal / 1,000 gpm max
  • Pressure: Gravity
  • Electrical: 460V / 3 phase / 60 Hz / 44.6 FLA
  • Optional pump: 3 HP–10 HP (depending on sludge volume/characteristics)
  • Service connections (Inlet / Out / Float): 12" / 12" / 6" - 150# Flange
  • Settled solids discharge: 6" flange
  • Recycle pump: Hellbender HB-150, 20 HP
  • Active surface area: 239 ft²
  • Nominal water volume: 8,450 gallons
  • Float hopper capacity: 360 gallons

Notes

• Leases available for durations of three months or more.
• RT series packaged DAF systems incorporate decades of continuous improvements and are used across varied applications.

Technical specifications

• Brand: Evoqua (RT series)
• Technology: Dissolved Air Flotation (DAF) — dissolved air-in-water recycle produces micron-sized bubbles to float contaminants
• Typical removal targets: TSS, BOD, FOG
• Power (examples): 460V / 3 phase / 60 Hz (31–44.6 FLA depending on model)
• Recycle pumps: Hellbender HB series (HB-90 15HP for RT-50A/RT-100A; HB-150 20HP for RT-240A)
• Connection flange sizes vary by model (inlet/out/float examples: 6"/6"/4" up to 12"/12"/6" - 150# Flange)
• Optional sludge pump selection typically 3 HP–10 HP depending on sludge volume and characteristics
• Automated settled solids auger and optional sludge pump control via float level sensor