This document discusses dissolved air flotation (DAF) systems for treating industrial and municipal wastewater. DAF uses microscopic air bubbles to attach to contaminants like oils and suspended solids, floating them to the surface for removal. The document outlines ETS's turn-key DAF systems, which are simple and effective at removing various contaminants. It also lists their industrial and municipal applications and provides specifications for ETS's 14 standard DAF models.

1. DAF
DISSOLVED AIR
FLOTATION
Simple by Design
Experts in integrated service
• Consultation
• Development
• Engineering
• Installation
• Follow-up
Turn-Key systems
Accurately sized units
Treatability testing
Simple solutions

2. Applications
Dissolved air flotation (DAF) is a proven and
effective physical/chemical technology for
treating a variety of industrial and municipal
process and wastewater streams. DAF sys-
tems are commonly used for the removal of
oils & greases and suspended solids to meet
a variety of treatment goals including:
• 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
There is a wide range of industrial and
municipal applications for DAF including:
Industrial Applications
• Poultry processing
• Meat processing
• Laundries and textiles
• Egg processing
• Byproduct rendering
• Pulp and paper
• Plastics recycling
• Dairy and milk products
• Metal plating and finishing
• Bakeries
• Confectionaries
• Food processing
• Snack food processing
• Beverage
• Petroleum and petrochemical
refining
• Natural gas and petroleum fracking
• Biochemical
• Personal care products
Municipal Applications
• Waste activated sludge thickening
• Biological solids clarification
• Phosphorous removal
• Algae removal
• Landfill leachate
The DAF Process
The ETS RT Series DAF systems are designed to remove suspended solids
(TSS), biochemical oxygen demand (BOD5
), and oils and greases (O&G)
from a wastewater stream. Contaminants are removed through the use of
a dissolved air-in-water solution produced by injecting air under pressure
into a recycle stream of clarified DAF effluent. This recycle stream is then
combined and mixed with incoming wastewater in an internal contact
chamber where the dissolved air comes out of solution in the form of
micron-sized bubbles that attach to the contaminants. The bubbles and
contaminants rise to the surface and form a floating bed of material that
is removed by a surface skimmer into an internal hopper for further
handling.
Timer-operated, variable
speed drive allows fine
tuning of top skimmer
operation to match float
production
Oversized, adjustable
effluent weir rings pro-
vide easy adjustment of
water level and prevents
fluctuations from flow
surges
Compact,
heavy-duty design
allows for simple
installation and easy
cleaning around the unit
Oversized float hopper
provides intermediate
storage of material for
transfer to disposal or
dewatering
Full-length, counter-
current auger system
provides for the removal
of settled solids
NEED PHOTO
Stainless steel chain and
flight system operating con-
current with flow allows for
longer float residence time,
resulting in the driest float
material possible
Innovative contact chamber that
features multiple recycle injection
ports and a mid-tank injection
system to improve bubble-to-
contaminant contact
Recycle pressurization
and air supply controls are
simple to use
High efficiency, air-in-water solution
(whitewater) system, featuring the
HELLBENDERTM
DAF Pump, to provide
true dissolved air with high
concentrations of fine bubbles
Unique hydraulic design
provides optimum
performance without plate-pack
which is prone to fouling
Innovative air injection
system produces dissolved
air without a compressed
air supply
Key Features
ETS developed the RT Series of packaged DAF
systems over twenty-five years of continuous im-
provements and multiple installations in a variety of
applications. These systems provide basic features
not found with other DAF systems:
• Fourteen (14) different units to
meet a variety of applications
and flow ranges (10 to 2,500
gpm)
• Available in 304 or 316 stainless
steel construction
• Complete, skid-mounted design
for ease of installation (no field
assembly required)
• Rectangular profile for maxi-
mum space utilization
• Heavy duty design and 50-point
quality control program ensures
years of reliable service
• Superior performance without
the use of plate-pack that can
foul or collapse
• An industry-leading
HELLBENDER™ whitewater sys-
tem which is both efficient and
simple to use
• Large, internal float hopper
eliminates the need for an
external float tank
How is the
HELLBENDERTM
DAF
Pump different
from a regular
centrifugal pump?
• Specially designed to
operate at high (>100
psi) pressures and pump
water with entrained air
without cavitating
• Higher air dissolving
efficiency vs. standard
centrifugal pumps due to
high pressure and unique
design
• HELLBENDERTM
DAF
Pumps are distributed
worldwide by ETS
• HELLBENDER™ Pumps are
available in all bronze or
316 Stainless Steel
RT Series Specification Data
DAF
Model
RT-15
RT-30
RT-50
RT-70
RT-100
RT-125
RT-140
RT-150
RT-160
RT-180
RT-240
RT-300
RT-350
RT-500
Surface
Area (ft2
)
12
30
57
73
101
125
143
153
159
182
239
297
360
503
Length
(ft)
8’-3”
11’-10”
14’-11”
17’-11”
18’-8”
19’-1”
24’-8”
22’-1”
27’-8”
25’-1”
31’-1”
37’-1”
37’-6”
49’-6”
Width
(ft)
3’-6”
4’-9”
6’-4”
6’-4”
8’-5”
10’-5”
8’-5”
10’-5”
8’-5”
10’-5”
10’-5”
10’-5”
13’
13’
Height
(ft)
5’-3”
7’-1”
7’-2”
7’-2”
8’-2”
9’-8”
8’-2”
9’-8”
8’-2”
9’-8”
9’-8”
9’-8”
10’
10’

3. DAF System Options
• access platforms and stairs
• built-in flocculation tubes
• off-gas covers
• dissolved nitrogen whitewater systems
• effluent TSS monitoring
• flow control
• chemical feed systems
• polymer blend and feed systems
• flocculation tubes
• flocculation mix tanks
• UL control panels with PLC and SCADA options
About ETS
Environmental Treatment Systems, Inc. is a full-service environmental
company that has been providing engineered solutions to industrial
wastewater problems since 1987. Other treatment systems from ETS
include:
• HELLBENDERTM
DAF Pumps
• HELLBENDERTM
Mixing Systems
• FT Series Flocculation Tubes
• PABRTM
Anaerobic Systems
• CAPACTM
Anaerobic Systems
• IPACTM
Aerobic Systems 4310 McEver Industrial Drive Acworth, GA 30101
Phone: (770) 384-0602 | Fax: (770) 384-0603
E-mail: info@etsenvironmental.com
Website: ETSenvironmental.com
Treatability Testing
ETS has a comprehensive laboratory testing program to evaluate a
waste stream for dissolved air flotation. Portable pilot systems are
available to replicate actual process conditions and provide detailed
design and operational information for use in the design of a
full-scale pretreatment system.
Rental
DAF
ETS has a fleet of rental Dissolved Air Flotation (DAF) systems
available for short-term rental or long-term lease.
These systems include a 304 stainless steel DAF, installed control
panel and an integrated flocculation tube and are designed for
ease of transportation.
These DAF systems are available for immediate shipment and
only require process connections and power.