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DISSOLVED AIR FLOTATION

DISSOLVED AIR FLOTATION WATER TREATMENT PLANTS

AWC Water Solutions offers packaged water treatment plants based on dissolved air flotation (DAF) technology. These plants excel in treating lake and reservoir water containing high levels of color, algae and turbidity, as well as cold waters and high levels of iron and manganese.

Our DAF plants are custom-designed to meet our clients’ particular challenges. They can treat capacities up to 1,400 gpm (7,600 m3/d) per train (multiple trains can be combined for higher flows) and reliably achieve less than 0.1 NTU turbidity and 2.5-log, multi-barrier protection against Giardia and Cryptosporidium.

HOW THE DAF PROCESS WORKS

  • 1Flash Mixing
  • 2Flocculation
  • 3DAF
  • 4Filtration
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Flash mixing

A coagulant added to the raw water precipitates dissolved contaminants and encourages particles to form “flocs”.

  • Multi-chemical injection ports for coagulant, polymer, pH adjustment, etc. provides process flexibility
  • Static or powered mixers are options

Flocculation

Gentle agitation in the flocculation zone helps these flocs grow before they pass into the flotation zone.

  • Multi-stage hydraulic or mechanical flocculation
  • Carefully designed to minimize short-circuiting
  • Hydraulic flocculation has variable nozzles for site adjustable energy input
  • Mechanical flocculators are fitted with variable speed drives

Dissolved air flotation

Once in the flotation zone, microscopic air bubbles are injected. The 50 micron bubbles used for flotation are formed by recycling a small stream of clarified water through an air pressurized, packed tower saturator to specially designed nozzles at the DAF cell inlet. Here, a rapid pressure drop causes the air to come out of the solution and form millions of small bubbles, which are then dispersed through the flocculated raw water. Then, the bubbles rapidly float the flocs to the surface and the accumulated float is skimmed off.

  • Inlet/outlet manifolds for even flow distribution
  • Mechanical float or hydraulic removal options are available
  • “V” hopper bottom for sludge thickening and hydraulic sludge removal option available

Filtration

Clarified water passes to the high-rate filter for final polishing and the filter is periodically cleaned by water or air/water backwashing.

  • Mono, dual and multi-media options
  • Options for iron, manganese and arsenic removal
  • Water backwash with surface wash option
  • Air scour/water backwash option for reduced water consumption and improved cleaning
  • Nozzle and plenum-type underdrain

Plant Features

Quality tank construction

AWC constructs its tanks out of highly corrosion-resistant marine-grade, 5086 aluminum alloy. This construction eliminates the need for corrosion-protection coatings and prevents premature failures, which can occur with poor surface preparation or coating failures. Sacrificial anodes are used to further increase protection against corrosion. All fasteners in contact with the aluminum are 316 stainless steel to minimize galvanic corrosion. Stainless steel tanks are also available upon request. Our process equipment components can also be supplied for installation into site-constructed concrete tanks or retrofitted into existing tankage. In these circumstances, AWC can provide tank dimensions and other civil criteria.

Electrical systems and control panels

AWC designs, builds, programs and commissions fully integrated automated control and electrical systems. Our systems feature:

  • Integrated UL and CSA approved MCC’s and control panels
  • Fully automatic operation with advanced instruments and controls
  • Remote monitoring, control and SCADA options
  • Industrial quality PLC’s with simple plug-in, pre-programmed modules for reduced training and technical support

Chemical systems

We offer a full range of chemical mixing and dosing systems, including solution tanks, mixers, dosing pumps and safety equipment.

Advantages of AWC DAF Plants

Corrosion-Resistant

Our plants are fabricated with marine-grade aluminum alloys and stainless steel to provide superior resistance to chemicals and corrosion, resulting in longer life.

Cost-Effective

Our packaged DAF plants are pre-assembled and pre-tested in our controlled facility, often saving 50 percent or more over in-situ construction. They can also be integrated into pre-engineered building systems for increased savings and reduced schedule. Their small footprint also reduces building costs.

Simplicity

Our DAF plants are quiet, simple and easy-to-operate with minimal operator input. They are also supplied complete with chemical dosing, water quality instrumentation, automatic controls and monitoring systems customized to meet local needs.

Discover the power of working with the industry’s most experienced team.

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