Dissolve ozone into water with a Static Mixer

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Ozone gas can be dissolved into pressurized, flowing water via a simple static mixer. Pressurized Ozone gas can flow into a water stream using a TEE provided the ozone gas pressure is greater than the water pressure. A downstream static mixer can then be used to thoroughly mix the ozone gas into the water.

Static mixer for ozone in action

Water should be pressurized when using a static mixer to aid solubility of ozone gas into water. Therefore, the ozone gas must be under pressure to force into the water flows. We have found that water pressure around 30 PSI is ideal for mass transfer, however higher or lower pressures can also be used.

Advantages:

  • – Simple, effective system design with no moving parts
  • – Great option for pressurized water
  • – More energy efficient than a venturi as a pressure differential across the mixer is not requied
  • – Easier to contain ozone gas and maintain a safe environment due to ozone off-gassing
  • – Can work with water that may plug or obstruct a venturi injector

Disadvantages:

  • – Higher risk of water back-flow into ozone generator due to pressurized water
  • – Requires flowing, pressurized water
  • – Greater risk of water backing up into the ozone generator as the water is pressurized

Ozone gas is partially soluble into liquid. However, using proper methods and equipment high mass transfer efficiencies can be realized with any method of dissolving ozone into water. Review the tips below to help design a proper system using a static mixer in your ozone application.

Fundamentals of Ozone Solubility:

     -Lower temperatures increase the solubility rate of ozone gas into liquid

     -Higher pressures increase the solubility rate of ozone gas into liquid

     -Higher ozone gas concentrations increase the solubility rate of ozone gas into liquid

Design considerations for your ozone system using a venturi injector:

Static mixer installation tips

  • Install static mixer shortly after the ozone injection point, within 12-inches if possible. Typically ozone bubbles will shear as they enter the water but combine again into a large air-pocket in the top of the pipe. Take advantage of the smaller bubbles as soon as possible.
  • If flowing water into a tank, install the static mixer within 12” from the tank
  • If flowing water into an un-pressurized tank, consider using an orifice to create back-pressure on the static mixer to improve solubility
  • Ensure proper flow-rate of water to achieve optimum water velocity for the mixer in use

Read full and original article HERE

Learn more about ozone solubility HERE

Purchase static mixers for ozone HERE

How to read a Venturi Injector performance chart

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The Mazzei Venturi Injector is incredibly predictable and reliable in the performance of liquid flow and gas suction. Using the performance chart provided by Mazzei allows for accurate planning and engineering of your ozone system. However, a proper understanding of this performance chart is necessary.

Mazzei Venturi Injector for ozone

Below is a chart for a common venturi injector. The injector is capable of mixing both liquid and gas into the main water flow through the venturi injector. For the purpose of dissolving ozone gas into water, the 3rd and 4th columns can be ignored completely as these refer to liquid suction only.

The first column is the injector inlet pressure, which is the pressure provided to the venturi injector inlet. The 2nd column is the injector outlet pressure, which is the pressure exerted on the injector outlet from delivering the water to the point of use. The 3rd column called MOTIVE FLOW states the flowrate of water going through the injector based on inlet/outlet pressures. This is what allows the proper pump to be chosen, calculate gas to liquid ratios and more. The last column called AIR SUCTION lists the amount of gas (oxygen,ozone, air), that can be sucked into the water stream at these aligned injector inlet/outlet pressures. As can be seen from the chart, as injector outlet pressure (2) increases, injector suction decreases (4). This is true even though the motive flow (3) stays relatively constant.

 How to read a Venturi Injector performance chart

Read full and original article HERE

Learn more about ozone solubility HERE

Learn more about ozone venturis HERE

Purchase venturi injectors HERE

Dissolve ozone into water with Venturi Injector

Ozone gas can be dissolved into flowing water via a venturi injector. A venturi injector is typically up to 90% efficient and can be up to 99% efficient at dissolving ozone into water making this the most common and preferred method for ozone injection.

A venturi injector uses a pressure differential across a small orifice with an off-set opening and a suction port. Ozone gas is pulled into the water via the suction port of the venturi. Due to the pressure change and forces present the ozone gas dissolves into the liquid extremely quickly, and efficiently.

Venturi injector in action with clear pipe

To use a venturi injector water must be flowing and water pressure must be present with the ability to drop pressure at the discharge of the venturi injector. Water may already be flowing from another source to provide the flow and pressure, or a dedicated water pump can be provided to provide the flow and pressure needed for the venturi injector.

Mazzei venturi injector flow pattern

Advantages:

  • Extremely efficient
  • Great option for pressurized water
  • More ozone dissolved into water = less ozone off-gassing = safer environment
  • Easier to contain ozone gas and maintain a safe environment due to ozone off-gassing

Disadvantages:

  • Typically requires more energy than other options due to required pressure differential across venturi injector
  • Requires flowing, pressurized water
  • Greater risk of water backing up into the ozone generator as the water is pressurized
  • Venturi can plug or become obstructed in contaminated water

Ozone gas is partially soluble into liquid. However, using proper methods and equipment high mass transfer efficiencies can be realized with any method of dissolving ozone into water. Review the tips below to help design a proper system using a venturi injector in your ozone application.

Fundamentals of Ozone Solubility:

     -Lower temperatures increase the solubility rate of ozone gas into liquid

     -Higher pressures increase the solubility rate of ozone gas into liquid

     -Higher ozone gas concentrations increase the solubility rate of ozone gas into liquid

Note:

We exclusively use the Mazzei Venturi Injector manufactured by Mazzei injector Co. All performance chart and venturi suggestions are based on the Mazzei Venturi Injector.

Design considerations for your ozone system using a venturi injector:

Sizing Venturi Injector properly

Venturi Injectors are available in a wide variety of sizes to meet a wide variety of water pressures and flow-rates. Using the right Venturi Injector for your application is paramount for a successful application.

Each Venturi Injector is provided with a performance chart showing the expected water flow-rate, water pressure, and correlating suction rate based on discharge pressure. Use this to determine the right size venturi for your water flow-rate and/or gas suction needs.

See our article HERE on reading Venturi Injector performance charts.

General Venturi Injector Installation Tips

  • Venturi injectors should always be installed in either a horizontal position or vertical position with the outlet above the inlet (water flowing upward). Never install with the inlet above the outlet as it may cause erratic suction
  • Always install piping after the venturi before flowing water into a tank. At least 12” of piping should be used at the venturi outlet
  • Never restrict the venturi outlet, consider using larger tubing at the venturi outflow than inflow as the pipe will be filled with both the water and added gas that has been pulled into the venturi.
  • For best performance target a 20 PSI pressure differential or greater between the venturi inlet and outlet
  • Install pressure gauges on tee’s directly at the venturi inlet and outlet to verify water pressures

Full Article with additional details HERE

Ozone for Rainwater Re-use

Great video below to show the use of ozone in rainwater re-use applications. However, the first half of the video provides great general info about ozone that is helpful to anyone wanting to learn a bit more about ozone.

Also, the info about ozone mixing is relevant to many ozone applications and industries. If you have a moment and are interested in ozone applications, give this video your attention.

OS-6 Ozone Monitor with an SAT-1 Signaling Tower and SM-EC Sensor

Below we can see the OS-6 Ozone Monitor with an SAT-1 Signaling Tower to enable visual/audible alarms (if ozone levels are detected above .1 PPM, the OSHA safety limit), as well as an SM-EC Sensor which allows for ozone detection between either 0-20 or 0-50 ppm. The OS-6 is an industrial grade ozone controller/monitor, and it is designed to optimize accuracy, ease of installation and operation.

This is how your OS-6 Ozone Monitor should appear when it is connected to the SAT-1 Signaling Tower and the SM-7 Sensor.

Please Click Here to Contact Us Today, and find out how our ozone experts may be able to help you!

Dissolved Ozone Test Kits

CHEMetrics Chemets self-filing reagent ampoules are a great way to test for dissolved substances in liquids. These visual test kits allow you to obtain results by measuring the color of the sample according to the color comparators provided with the kit. This unique method allows you to attain results quickly and accurately with minimal contact with potentially hazardous materials. While traditional methods often require multiple steps and thorough preparation, these test kits allow you to obtain dependable results with a few simple steps. By simplifying the testing method, Chemets test kits reduce the potential for operator error. Additionally, each of the ampoules contained in the test kits is vacuum sealed which helps eliminate the problem of obtaining inaccurate results from stale or unstable reagents. These reagents are stored right in the tip of each ampoule and sealed in glass, thereby minimizing direct contact with the chemicals.

What’s Included:

-30 self-filling ampoules

-Low and high-range comparators

-25mL Sample Cup

-Activator Solution

-Instruction Manual

Videos Overviewing the CHEMetrics Dissolved Ozone Test Kits:

I-2019 Dissolved Ozone Kit with Digital Meter
K-7404 Dissolved Ozone Test Kit
K-7404 Dissolved Ozone Test Kit

Please Click Here to view all of our dissolved ozone monitors.

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Custom RCB-1

Our RCB-1 Relay Control Box can be used for a wide array of different applications. It is most commonly used to regulate gas levels as an accessory to ozone monitors. Another popular application is to use it in a custom ozone chamber, where the RCB-1 is connected to an ozone monitor, which tracks the ozone levels inside of a given chamber. Once the ozone level in the chamber reaches certain point, the ozone monitor will send a signal to the relay control box, which will then send a signal to an ozone generator to stop producing ozone for the chamber. Once ozone levels in the chamber drop past a desired level, another signal will be sent through telling the ozone generator to once again begin producing ozone until the chamber gets back to an ideal level. Simply put, the RCB-1 is most typically used to regulate the ozone levels for a given circumstance.

We recently had a customer that wanted to regulate the production of his oxygen concentrators. After a call with one of our ozone specialists, they came to the conclusion that a custom RCB-1 would be the best option. Our shop technicians were able to make an RCB-1 with a built-in pressure gauge that would allow the relay control box to regulate the pressure at which the oxygen concentrators were performing.

Our RCB-1 can be found here.

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Ozone Generator Dust Disaster

Dust-Filled Ozone Generator

All is not lost when you open your ozone generator cabinet one day and find everything covered in dust.  The dust is not toxic, just messy.  It has come from the oxygen concentrator which uses a clay based zeolite material as a sieve to filter out Nitrogen from the air and supply dry oxygen for the ozone generator cells.  The dusting can be caused by moisture getting into the sieve beds, excessive flow or pressure through the oxygen concentrator.  Let’s work on getting repairs made first and then discuss ways to prevent this from happening again.

  1. The oxygen concentrator (aluminum tank assembly on the upper left side) needs to be removed and either replaced or rebuilt.  This assembly will be supplied either with 120 volt or 24 volt power.  You will need to disconnect this power along with the air feed hose and smaller 1/4″ ID oxygen tube coming off the oxygen tank.  The air hose is usually a 1/2″ barb fitting and the oxygen fittings at the other end are a quick connect type fitting. 
  2. Clean up the dust with a long bristle brush and vacuum or compressed air blower. 
  3. Remove the small tank from the oxygen concentrator.  This a storage tank/surge tank and could be full of dust.  It will also have an orifice on the outlet.  Make sure this is open.
  4. A network of green tubing with check valves and orifices are at the top.  These check valves will need to be replaced and the orifices open. 
  5. Order new parts.  It is likely that all the filters need to be replaced.  The air compressor inlet filter, two coalescing filters to remove moisture and dust from the compressed air,  and for some machines, an oxygen filter.  (see the parts list below).  When the oxygen concentrator dusts, you will need to order new or rebuilt sieve beds.  It is also likely that the valve set is compromised and the Nitrogen exhaust mufflers are plugged with dust.  The mufflers can be hard to clean, and are fairly inexpensive, so it is recommended to replace them.  The valve is a shuttle valve which is sensitive the contamination and sticking.  It can be rebuilt, but sometimes it is difficult to get it to work as well as new and it may be best to replace it. 
  6. Once everything is cleaned up, use the compressed air to gently blow some air through the ozone generator to make sure it is not plugged.  Some generators are more sensitive to getting plugged and will have an oxygen filter to prevent this.  Do not put too much pressure on the ozone generator. 
  7. Replace the filters.
  8. Re-assemble the oxygen concentrator with new sieve beds, oxygen check valves, and valve set.  Mount back in place.  It may be easier to connect the oxygen lines before mounting. 
  9. Turn the system back on.  Leave the ozone off.  The compressor will turn on and the oxygen concentrator will begin cycling the valve to direct air through the oxygen concentrator.  The compressor will reach 20-40 psi as the concentrator cycles air through the concentrator.  Exhaust nitrogen will blow out of the muffler. 
  10. Oxygen flow and pressure will register on the cabinet door. 
  11. When the oxygen supply is stabilized and flow appears normal through the ozone generator, you can turn on the ozone generator. 

The most common cause of dusting in an oxygen concentrator is excessive moisture in the feed air.  If the ozone system is located in an environment with high humidity there are three things you could do: 1) move the equipment to a dryer environment and plumb the ozone to the point of use, 2) Plumb a refrigerant air dryer between the air compressor and the coalescing filters, 3) plumb an air hose to extend the air inlet filter for the compressor to a dryer location.  Moisture, along with excessive oxygen flow rates are the leading cause of concentrator failure.  When the unit is running, adjusting the oxygen flow to a lower rate will extend the life of the concentrator. 

Replacement Parts (to visit a product page, click on the product name)

Rebuilt OG-15 Sieve Beds

Compressor Air Inlet Filter

Coalescing Filter Replacement for M28-03-CK-00 Filter Housing

Coalescing Filter Replacement for M28-03-BK– Filter Housing

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Custom Solutions from Ozone Experts

We recently had a customer contact us in need of an ozone destruct unit. This particular customer runs a company where they sell ozonated water out of their store. The process to ozonate and disinfect the water was taking place in a backroom in the store. Because of the high foot traffic in the store with customers and employees constantly going into and leaving the store, it was important that ambient ozone levels remained low. The problem was that too much ozone was leaking out into the air, creating an environment that had the possibility to become unsafe. When one of our ozone specialists spoke with the customer on the phone, they had figured a CDA destruct unit would be the best option, considering it would be able to circulate the ambient air and destroy any ozone that may be present. However, our technician thought that a different route may be best. After some time going over the dilemma, our ozone specialist recommended a custom CDU-300 ozone destruct device. This decision was reached because it would be best to destroy the ozone in the tank where it was being used to ozonate the water, instead of waiting for the ozone to leak from the tanks before trying to destroy it. The final product is this CDU-300 (seen below) with a blower assembly to destroy ozone at the source, and not allow it to get into the ambient air. This just goes to show how speaking with an ozone expert can help you get the optimal product that will best fit your specific applications.

To see our full line of ozone destruct devices, Please Click Here.

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OXO10-OEM Assembly vs. ATF-15 Oxygen Concentrator

ATF-15 Oxygen Concentrator
OXO10-OEM Oxygen Concentrator

With all of the different oxygen concentrators that we have to offer, it can sometimes be difficult to discern between all of the options to figure out what is the best product for you. In this article we will be comparing the ATF-15 to OXO10-OEM oxygen concentrator. Lately, we have been recommending customers purchase the OXO10-OEM as opposed to the ATF-15, this is primarily because of the cost difference and similar performance specifications.

OXO10-OEM Assembly

The OXO10-OEM is capable of efficiently producing 21 SCFH (10 LPM) of oxygen from an OEM oxygen concentrator module @ 15 PSI and costs $1,450. One of the great things about this oxygen concentrator is that it only requires electrical power and compressed air for operation. Because of the compact design, the OXO10-OEM is made to fit into your existing system where high oxygen purity is needed. The OXO10 also includes an air pressure gauge, along with an air pressure relief valve for increased safety. One of the convenient features from the OXO10 is the rebuildable components. The sieve beds and valves are all replaceable, which leads to saving money in the long-run since you will not need to replace the entire system.

ATF-15

The ATF-15 is capable of producing 15 SCFH of oxygen at 18 PSI and costs $1,989. A patented single rotary distribution valve built into the ATF module continually rotates at a low speed from a small motor. The valve is maintenance-free, self-cleaning, insensitive to contamination, and invulnerable to wear. It directs the flow of compressed air to a group of four sieve beds (adsorption), while another four beds are purged into the atmosphere through the valve (desorption). The remaining four of the twelve beds are interconnected through the valve to equalize pressure as the sieve beds sequentially transition between adsorption and desorption.

Pressure Swing Adsorption (PSA) Technology

Both of these oxygen concentrators incorporate PSA technology. PSA technology is essentially separating the oxygen (21%) from the air it is provided and returns the nitrogen (78%) to the atmosphere through a waste gas muffler. The main component to this technology is a material called Molecular Sieve (Zeolite). This sieve is an inert, ceramic-life material that is designed to absorb nitrogen more readily than oxygen. This process is reliable, virtually maintenance-free and will last indefinitely as long as it does not become contaminated with water or oil vapors.

The OXO10-OEM Assembly can purchased here

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