4 Signs Your Standpipe is Stratified

Posted by Lily Kaiserman on 9/24/15 4:00 PM

A standpipe is a ground-supported storage tank with a height that is greater than its diameter. Its design helps generate storage and pressure with a low upfront cost compared to elevated tank geometries. While there are cost advantages to standpipes, its geometry is a liability: tall and skinny tanks naturally promote thermal stratification and harm water quality. Standpipes have a higher surface area to volume ratio – meaning that more surface area is exposed to heat from the sun, and there’s less volume inside the tank to absorb that heat. Additionally, the limited cross-sectional area of a standpipe makes it difficult to exchange heat between the hot water at the top of the tank and cold water at the bottom, resulting in thermal stratification. Below we have compiled four signs that indicate your standpipe is thermally stratified.

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Topics: active mixing, eliminate stratification, drinking water quality, PAX Water Mixer, storage tanks, water circulation, passive mixing, mixing systems, low turnover

4 Tips for Selecting In-Tank Aeration Systems

Posted by Susan Brenner on 8/31/15 4:43 PM

In-tank aeration is a proven method for removing trihalomethanes (THMs) from finished drinking water storage tanks. However, aeration technologies can vary greatly in their effectiveness and energy usage and selecting in-tank systems can be complicated. Several factors must be taken into consideration when selecting a system and each system should be customized to the tank to maximize THM removal while minimizing energy cost. Below, we have answered four questions received during our last webinar on in-tank aeration to help explain how in-tank aeration systems are designed.

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Topics: active mixing, active mixing for water storage tanks, drinking water quality, in-tank aeration, PAX Water Mixer

Improve Summer Chlorine Levels without Blowing DBPs

Posted by Lily Kaiserman on 8/18/15 1:36 PM

When summer temperatures rise, chlorine demand inside storage tanks increases and water quality can degrade. Warm water temperatures, particularly at the top of the tank, increase biological growth, deplete residual disinfectant and increase the formation rate of disinfection by-products (DBPs). Thermal stratification also creates hot and humid conditions inside the headspace, greatly accelerating corrosion rates inside steel tanks. One effective solution to combat stratification and maintain disinfectant residual levels is active mixing. A powerful mixer eliminates thermal and chemical stratification inside tanks and reduces the growth of biofilms and DBPs. Below, we answered three common questions on maintaining residual disinfectant levels inside water storage tanks.

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Topics: active mixing, eliminate stratification, drinking water quality, PAX Water Mixer, storage tanks, water circulation, passive mixing, mixing systems, low turnover

How to Prevent Ice Damage inside Water Storage Tanks

Posted by Lily Kaiserman on 9/10/12 5:58 PM

In the water distribution system, cold weather can create risks that are hidden from plain sight: ice accumulation inside water storage tanks. Often, when operators realize they have a problem with ice buildup in their tanks, the tank’s interior is already damaged or the wall is punctured. Additionally, traditional methods for reducing ice formation inside water tanks have been expensive, difficult and often only partially effective.

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Topics: active tank mixing, PAX Water Mixer, mixer case studies, freeze protection

Top Five Mixing Questions from ACE12 in Dallas

Posted by Lily Kaiserman on 6/20/12 1:26 PM

PAX Water Technologies had a great time in Dallas at ACE12 last week – our new THM Removal System (TRS) was featured at the New Product Technology Showcase and we fielded many great questions from ACE12 attendees at our booth. We always appreciate the opportunity to hear directly from operators and engineers about their water quality challenges.   

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Topics: active tank mixing, PAX Water Mixer, mixer case studies, ace 2012

Five Mixing MythBusters

Posted by Lily Kaiserman on 5/7/12 12:46 PM

Charles Fishman (author of The Big Thirst) wrote a piece for the Washington Post last month on “Five Myths About Water.” Number two on Charles’ myth list is “bottled water is better than tap water,” where he unveils that tap water is actually MORE closely monitored than bottled water and that in blind taste tests “people can’t reliably pick bottled from tap.” At PAX Water, Charles’ article got us thinking about some of the myths we’re trying to bust in the drinking water industry. Here are our top five:

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Topics: active mixing, eliminate stratification, drinking water quality, PAX Water Mixer, storage tanks, water circulation, passive mixing, mixing systems, low turnover

Active vs. Passive Mixers – 3 Common Misperceptions

Posted by Lily Kaiserman on 4/23/12 12:35 PM

Just as electronic technologies have improved with time, technologies in the water distribution system have evolved from large and expensive pieces of equipment into smaller and more efficient solutions. Developed in the ‘80s, passive mixing systems use bulky nozzles with one-way valves to squirt water in different directions during the fill cycle. Because these mixers rely on the momentum of influent water, passive systems do not mix water once the tank is full or during the drain cycle and tanks re-stratify once the infill has stopped. A common workaround is forcing tank operators into a minimum turnover rate (which is both energy-intensive and expensive).

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Topics: PAX Water Technologies, active tank mixing, active mixing for water storage tanks, PAX Water Mixer, passive mixing

Want To Improve Water Quality? Get Active With Your Mixing!

Posted by Peter Fiske on 5/13/10 5:57 PM

Because mixing in water storage tanks is a new concept, many people don’t realize that there are actually two different types of mixing: active mixing and passive mixing. Most state regulators don’t appreciate the difference either.

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Topics: water quality, eliminate stratification, PAX Water Mixer, storage tanks, impeller, mixing systems

PAX Water Technologies - Improving Efficiency in the Water Industry

Posted by Peter Fiske on 3/26/10 7:15 PM

Welcome to the PAX Water Technologies' Web Log! Four years ago, we entered the water industry with a new approach to product development: biomimicry. Biomimicry is the process of studying natural systems and adapting Nature's best designs to solve engineering challenges. We saw a great fit with the water industry: Nature has been transporting, treating and distributing water since the formation of the planet. And over all those millions of years Nature has developed some ingenious ways of improving process efficiency and saving energy.

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Topics: water quality, eliminate stratification, biomimicry, PAX Water Mixer, storage tanks, freeze protection, dbp formation

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