Hydro-Flo
Technologies manufactures complete dissolved air flotation (DAF)
systems with recycle/air diffusion system including recycle pump,
air saturation vessel and related controls. The DAF is sized to
provide a surface loading rate equal to 1.5 lbs/ft2/hour of TSS and
FOG combined. The Hydro-Flo dissolved air flotation system is
designed to separate floatable particles of oil or solids by
floating them to the surface with air bubbles. Our DAF system
incorporates a high efficiency, high pressure air to water saturation
contact recycle tank system, and a DAF separation cell with surface
skimmer. The air bubbles form at the release of pressure and
intimately contact the raw, incoming wastewater with a specially
designed reaction nozzle system that promotes air bubble impingement
with raw incoming wastewater particles and the forming air bubbles.
The surface flight skimmer assembly drags the floated material to
the skimming beach and into the float chamber.
The Equipment:
The basic system is
comprised of a separation cell, recycle / air dissolving system
and related
controls.
DAF Separation Cell:
The DAF separation cell is designed using elements of American
Petroleum Institute's publication 421 Feb. 1990, “Design of Oil-Water
Separators” to ensure the best possible use of particle rise rate
performance. The separation cell can be fabricated with a flat
bottom or a rectangular “V” bottom. The DAF cell is typically
manufactured from carbon steel, but other materials of construction
are available as an option.
DAF Flotation Tank Surface Skimmer:
Hydro-Flo provides a removable float skimming system with frame
assembly and drive motor, sprockets, chains and full width stainless
steel skimming blades. The skimmer blades are mounted on swivel pins
that are fastened to the skimmer chains, which maintain the blades
in a down position at all times. The conveyer chains are provided
with drive sprockets on a full width shaft at the drive end and four
independent idler sprockets at the return end. The skimmer system
frame comes equipped with a sprocket tension adjustment device and
the carrying and return tracks for the chain. The entire system is
self supporting with side and end channels, and cross members with
lifting lugs that permit removal of the skimmer assembly as a
complete unit for easy cleaning and service. The skimmer drive
system comes with a hollow shaft, maintenance free gear reducer.
The skimmer system can be made vapor tight with the addition of
optional cover panel.
Recycle / Air Dissolving
System (RAD):
The Hydro-Flo dissolved air flotation system comes standard with a
recycle water air dissolving system rated at 50% of the DAF design
flow, providing an air to solids ratio (A/S) of between 0.015 and
0.040 lbs air/lbs. solids. Standard models are designed for 100
psi, 100 degree F. The air dissolution tank is fitted with an
internal water cascading nozzle system to ensure efficient mass
transfer and air/water contact. The tank is provided with an
independent safety pressure relief valve and pressure gauge. The
air dissolution tank is provided with an external, clear sight tube
with water/air interface level float sensor system for automatic
water/air level control. Manual flow control valves are provided
for balancing the recycle rate, for the rate control of the air
addition, the saturated recycle rate to the DAF inlet reaction jet,
and the pump by-pass flow volume.
Bottom Sludge Auger (Optional):
As an option the DAF can be provided with a ribbon flight auger made
from 304 stainless steel. The auger has converging flights to
gently move settled sludge toward the sludge outlet nozzle, and is
driven at 3-5 RPM by an industrial duty TEFC motor with gear box
speed reduction.
Control Package:
All Hydro-Flo dissolved air flotation systems
are fully automated. Control packages (depending on your
specific requirements) are available in either basic relay logic
control, or a fully state of the art
PLC
with touch screen HMI and our
sophisticated treatment algorithms. The relay logic controls
package allow basic reconfiguration of the original system settings,
while the PLC based package allows maximum flexibility
to change the process parameters, as well as tight control that
minimizes chemical usage. We can include a variety of options
including digital data logging of critical
process parameters, Ethernet access to process data, communication
with Building Management Systems, and even remote system access
using cellular wireless technology.
All enclosures are NEMA 4X. Where metallic
enclosures are used, they are provided with epoxy or polyester
finishes for corrosion resistance. All conduit is plastic coated,
where possible. Low voltage 24VDC is used throughout to minimize
service personnel exposure to high voltage. All panels are OSHA LOTO
and NFPA 79 compliant. UL-508 listing is available.
Effluent Monitoring: As mandated by
the local controlling authority, the effluent quality must be
continuously monitored. A two pen recorder is to be used to
monitor effluent flow rate and pH. The recorder is to be
equipped with a flow totalizer. Any effluent pH deviations will
trigger an alarm and system discharge will be halted.
System Packaging:
The system is supplied as a completely
fabricated "turnkey" package. All devices are pre-wired and plumbed.
You need to make the plumbing connections to
and from the system and a single electrical connection point for
incoming power. The disconnect on the MCP provides OSHA Lock
Out / Tag Out and NFPA 79 compliance. Systems requiring
compressed air require only one connection, and the valve is
supplied for OSHA LOTO.
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