DAF Pumps | Air-Whip Pump Out of the Ordinary

DAF Pumps

Dissolved air flotation, the process of injecting microscopic bubbles into an influent to create a flocculant, which is skimmed away. Sounds simple, doesn’t it? It is a simple enough concept. You create small enough parts so that things can be handled on a electro-chemical level. Charges attract suspended particles whose charges are keeping them apart. Microscopic air bubbles, correctly produced, along with the right chemical agents collect all the garbage in wastewater and float it to the top- each particle surrounded by microscopic bubbles that carry each particle away. Mind you, this isn’t the large bubbles produced by some equipment that produces something like chocolate mousse. This is ultra fine microscopic bubbles that do more than just produce a coagulant. Your end result is flocculant, a more solid and “load bearing” composition of very small bubbles. Your end product is much higher in waste content, leaving nearly pure clear water.

The savings can be enormous.

Treated water is much cheaper to send to a municipality than buying pollution credits.

Are you using Hellbender DAF pumps or Edur DAF pumps or another brand that costs thousands of dollars, but wears out in short order under industrial loads? Who wants to spend $25,000 every six months on replacement DAF pumps?

Enter the Air-whip DAF pump. It’s simple- our pumps last years. Some of our first pumps, installed several years ago are still operating at full capacity today,

Our technology produces the needed micron size bubbles with a specially engineered design that uses a modified standard style pump with much higher durability. One of our pumps actually had a work shirt introduced in the influent and is still running strong after the “experience”.

Inquire now about the Air-Whip DAF pump 888-216-1231. or email dave@dissolvedair.com

Not By Flocculant Alone – How Dissolved Air Solves A Paper Recycling Problem

Inquire about the Keystec pump: Call Dave Keys at 714-924-4422.

My Brother Dan and I went to visit a paper company a couple of weeks ago, here in the Los Angeles area. In East LA and Commerce there are miles and miles of industries that run various processes and you can imagine that recycling wastewater is of premium concern both for the savings of water, and the cost of disposing of waste materials.

Problem Solved with DAF Airwhip Technology

Enter the paper company. They had done some online research and called on Keystec to solve the problem that had arisen from trying to solve another problem.

The paper company produces recycled, post-consumer content cardboard, the sort that is used to package up your typical products from dry pasta to cardboard bases for shrink-wrapped goods. In an effort to recover more of the ink, clay, ash and debris from the water used in the paper making process, they had made adjustments to a chemical flocculant in the water. This seemed to work great- lots of material was floating to the surface in the processing tanks, but before very long at all, the operators realized that the flocculant was the consistency of chocolate mousse and there was lots of it. So much that it spilled over the collection tanks and processing byproduct ran onto the basement and everywhere.

It left lots of clay in the tanks too. A big mess.

We arrived on a Tuesday morning and met with the folks there and had a look at the so called DAF they were operating. It was using an old style cavitation pump, sucking air into the pump and spinning it out via centrifugal force, producing some fairly large sized bubbles. In essence, instead of creating a flocculant, they were creating big bubbles with coagulant clinging to it.

Oops! We’ve got it a little backwards here. True dissolved air flotation creates microscopic bubbles and they collect around relatively large flocculant particles and float them to the surface where the flocculant has the consistency of oatmeal, not chocolate mousse! They needed the proper three stage process of coagulation, flocculation and dissolved air flotation. Their pump wasn’t going to do the job with the single flocculation turned coagulation stage they were using, neither would it do much with a better flocculation with a two stage process because the bubbles were like beach balls compared to what’s needed for dissolved air flotation.

We recommended the Keystec Airwhip pump for its perfect application to this problem and its longevity compared to standard DAF pumps.

Soon this company will be returning much of this paper by-product back to the new product and returning clear water to their system.

Result? Savings from reduced downtime, savings from reduced sewage fees and savings from reduced disposal of paper byproducts that should be re-integrated with new product.

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New and used recycling equipment

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Rent A DAF Now

DAF (dissolved air flotation) wastewater treatment units in varied sizes and designs are now available for rent. In addition to providing effective solid separation for wastewater treatment, these DAF rental units have a modular, space-saving design, stainless steel construction, and low maintenance needs. Since the rental units are in sizes up to several thousand GPM, you can run full capacity tests before choosing to buy a permanent DAF solution. You can visit or call any time for information on DAF Rental equipment.

Dissolved Air Flotation Equipment Rental

PTEC Serve is ready to meet all your DAF purchase and rental needs. Contact them to day for the right wastewater treatment options for your needs.

Ready For Hurricane Season? Call Dan Keys

Ready for hurricane season? Of course, we’re not but it’s coming with its wind and waves. What will this do to the oil floating on top of the gulf? It will emulsify much of it, mixing it and dispersing it into such small particles that its electrochemical forces of like charges will suspend each particle in a force field of its own charge, repelling nearby particles with like charges away. The oil, though not chemically bonded to the water stays mixed, creating a sludge of tiny particles that can only be dealt with on a microscopic level. Some of this microscopic environment includes microbes that will readily eat the oil but then there are the little problems of waste and depleted oxygen. Now you have suspended oils, suspended proteins and depleted oxygen. A perfect environment for… nothing. No fish, no wildlife, just a growing dead zone in the gulf. If the problem spreads to wetlands, then you’ll have dead zones forming there as well.

Dissolved air flotation can be applied to these areas and the oil and microbe waste can be collected around the air bubbles and skimmed off. Now what’s needed are long lasting, high rate, high volume capable pumps that can handle the millions of gallons long term.

Enter the Air whip pump by Keystec.DAF pumps that defy common design and outlast most DAF pumps on an exponential scale.

More information at the Keystec website for: DAF pumps.

Dissolved Air Flotation – Applications and Limitations in Wastewater Treatment

Dissolved Air Flotation is widely used in Wastewater Treatment as well as in less traditional applications such as:

•   drinking water clarification and color removal
•   Algae removal
•   By-product recovery  (i.e. metals, etc.)
•   Dissimilar solids separation

Within Wastewater Treatment, DAF application can be divided into
•   Primary Treatment
•   Secondary Treatment
•   Tertiary Treatment

In all cases, DAF (dissolved air flotation) is used to separate fine solids (any constituents that are not dissolved) by flotation, assisted by the attachment of microscopic bubbles.  Often, solids that would normally settle are forced to the surface for removal through the attachment of those fine bubbles.

DAF is used in a wide range of situations where the suspended material  can be as little as 20 mg/l (as in algae or color removal) to tens of thousands of mg/l as in rendering or some petro-chemical oil/water separation situations.  Each case must be evaluated for size, flow, and chemical requirements.

To further complicate the issue, the general term, DAF, no longer covers all the approaches to separating solids with microscopic bubbles.  Other similar technologies that are frequently referred to as DAF are:

•   CAF (cavitation air flotation)
-Bubbles produced by a spinning disk without pressure
•   BAF (bubble air flotation)
-Bubbles produced by blowing air through a micro-filter into the water
•   SAF (saponification air flotation)
-Bubbles produced with the aid of a surfactant for more aggressive attachment
•   EAF (entrained air flotation)
-Bubbles produced with relatively low pressure and high shear, entrained in the water

Dissolved Air Flotation

DAF Pumps

DAF Design

Low Cost DAF Pump Design Breakthrough for Dissolved Air Flotation

Low Cost DAF Pump Design Breakthrough for Dissolved Air Flotation

Is expensive frequent pump replacement a given for DAF applications? No!

Not with the KeysTec AirWhip brand Aeration Pump.

• Short pump life
• High Cost
• Complexity
• Intolerance of Entrained Solids
• Difficult or Impossible Maintenance

• Lower Initial Cost
• Lower Maintenance Cost
• Simplicity
• Easily Passes Entrained Solids
• Flexibility in Operation Modes
• Very Long Life Expectancy

Most of our pumps are still in operation 2 years plus from day one of installation and they cost a fraction of their standard counterparts!

More about Low Cost DAF Pump AirWhip by KeysTec.

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