How do you size an ozone generator for water treatment?

Sizing an ozone generator can be made simple with the right information. However, obtaining said information can sometimes be problematic.

For more 10g ozone generator for drinking water supplierinformation, please contact us. We will provide professional answers.

&#;When selecting and sizing an ozone generator for your application, there are three important points to consider for effective results&#;

When selecting and sizing an ozone generator for your application, there are three important points to consider for effective results:

1. Ozone demand (g/m3, mg/l, ppm, etc.): The most important information when selecting an ozone generator for your project or application is an ozone demand, or how much ozone per volume of water or air you need to apply to remedy an existing problem, which is typically the inactivation of harmful or dangerous bacteria or contaminants. You can determine ozone demand through various means, including:
   • Published Scientific Studies
   • CT (Concentration Time) Factor Tables for Bacteria Deactivation
   • Experience or Pilot Testing
   • Government Regulations
2. Volume: The amount of water, air, gas, etc., that you need to treat (m3/h, GPM, SLPM, etc.).
3. Compensation: Implementing proper compensation is crucial to account for factors limiting ozone participation in the reaction. This compensation considers the efficiency of the ozone dissolution process, ozone concentration, and ozone decay half-life.

Once you know the ozone demand, you multiply it by the gas, water, etc. volume you need to treat. This will give you the theoretical amount of ozone required for your project in an ideal situation.

Implementing proper compensation for all contributing factors that limit ozone participation in the reaction factors about ozone production will allow you not to undersize the ozone system and achieve greater treatment results.

&#;To help you better understand how you can do the calculations, let us review the following practical example for swimming pool ozone application&#;

To help you better understand how you can do the calculations, let us review the following practical example for swimming pool ozone application.

• Ozone demand:
  To prevent any bacteria, algae or viruses from growing in the pool and to keep water safe and crystal clear, especially with organic dust and pollen entering the water in outdoor applications, you need to have a theoretical residual ozone concentration of 0.07 ppm, as we have learned from our experience over many years. An indoor pool will most likely work well with 0.04 ppm of residual ozone as indoors, you do not have organic dust, pollen, etc., blown into a pool by wind, dramatically increasing bio load and ozone demand. Some government recommendations suggest 0.03 &#; 0.05 residual ozone concentration, but I would never go as low as 0.03. CT factor for most bacteria diction is about 0.02 ppm/min
• Calculation:
  For a 50 m3 example swimming pool, To create 0.07 ppm ozone concentration (outdoor pool) in ice-cold water, you need to dissolve 0.07 g/m3(ppm) x 50 m3 = 3.5 g of ozone.
• Compensation:
  In reality, these calculations have to be compensated this way to find the actual size of the generator required:
  At 25˚C, the half-life of ozone in water is ~15 minutes (0.25 hours).
  To compensate for natural ozone decay in the water
  you will need to dissolve 3.5 g ÷ 0.25 = 14.0 g/h and not 3.5 g/h as calculations without compensation may suggest.

IS YOUR POOL OZONE GENERATOR UP TO THE JOB?

By Misha Shifrin (published in Water Tech Magazine)

After over a decade of building and supplying many ozone generators for pool water treatment worldwide, I noticed that we hardly sell anything locally. It seemed strange to me, so I decided to call several local pool professionals to find out the reason behind this. I asked them if they had ever used an ozone generator for water treatment. To my surprise, all of them answered yes. I then asked them if they were now using swimming pool ozone generators in their applications. To my astonishment, all of them answered no. I asked them why.

&#;Because the ozone machine for swimming pools doesn&#;t work,&#; was the answer from all. This was the equivalent of someone telling me that the world is flat. Ozone for water treatment has always been an excellent choice for all our clients &#; effective, reliable, relatively inexpensive, and ecologically clean. I asked one of the people I had approached &#; let&#;s call him &#;Joe&#; &#; to explain why an ozone generator didn&#;t work for him and why he was so dead-set against using ozone.

ONE CUSTOMER&#;S NIGHTMARE

Joe told me that a few years ago, he had installed an Ozonator pool for a customer&#;s 100 m3 residential pool. It was an air-fed, air-cooled ozone generator purchased from a major ozonator manufacturer. Furthermore, the manufacturer assured him that his equipment would produce enough ozone to disinfect the pool. However, it did not work. The pool water turned cloudy and began to smell after a few days. Eventually, he had to install a chlorine injection system, which corrected the problem for about eight months.

Later, he received a call from the customer, telling him the water was no longer as clear as it once was. After checking, the pool ozone generator was not working. As a result, he had to take it apart and scrape the buildup off the electrodes. He had to order a new electrode after one of the electrodes cracked. It was a nightmare scenario that no one needed. Several of his colleagues had had similar experiences, which explains why he didn&#;t touch another pool ozone generator again.

LOOKING AT THE NUMBERS

I took out my calculator and started to check what might have gone wrong at Joe&#;s pool ozone generator. Follow my steps:

1) 1 cubic meter (m³) = 1 million grams (g) of water

2) 1 g ozone dissolved in 1 m³ creates an ozone concentration of 1 part per million (ppm).

If you want to learn more, please visit our website 100g 200g ozone machine for water treatment product.

3) 100 g of ozone dissolved in a 100 m3 swimming pool will create a concentration of 1 ppm.

4) A residual ozone concentration of 0.03-0.07 ppm is typically recommended for a chemical-free swimming ozone pool. Let&#;s say that 0.07 ppm residual would have done a good job for Joe&#;s customer.

5) 100 g x 0.07 ppm = 7 g of ozone dissolved.

6) At a pool water temperature of 25 degrees C (77 F), half of the ozone is destroyed every 15 minutes (half-life of ozone at that temperature = 0.25 hour [h]). Therefore, we must inject four times more ozone to maintain the concentration every hour. As a result, at least 28 (g/h) of ozone should have been dissolved to maintain the required concentration.

These simple calculations are fundamental in selecting the right size generator.

CHECKING THE OZONATOR FOR POOL WATER

Joe told me that his generator was rated at 16 g/h. So, I visited the ozonator manufacturer&#;s Website, where I learned that the ozone was produced from that generator at 1 percent concentration by weight. We have never dissolved more than 6-10 percent of the ozone in our lab experiments at a 1 percent concentration. To dissolve 60-70 percent, we usually need a concentration of 6 percent or higher. Joe&#;s generator was only dissolving 1.6 g of ozone (16 g x 10%=1.6 g), creating a concentration of only 0.004 ppm. Indeed, that concentration is only one-tenth of the required. Such a low ozone concentration is approaching levels where, according to a University of Maine study*, even using distilled water is better than ozone. No wonder Joe&#;s generator didn&#;t work simply because they did not select the right size generator.

If he had found a 25 g/h oxygen-fed ozone generator that produces ozone at 6 percent concentration for his customer, he would have had an ecstatically happy customer with crystal-clear, chemical-free swimming pool water &#; and a lot of referrals. The first service call for such a higher-production ozone generator might not have occurred until many years after the installation.

It is sad that correct information sometimes is not getting to the water treatment professional in the field. For this reason, after a few bad experiences with ozone applications, they may conclude that &#;ozone does not work.&#; In retrospect, better information about ozone pool generators, performance and capabilities would help the whole industry, consumers, and our earth.

You can find more information about ozone in swimming pools here

THE DOSAGE TO HAVE A CHEMICAL-FREE OZONE POOL

To prevent any bacteria, algae, or viruses from growing in the pool and to keep water safe and crystal clear, especially with organic dust and pollen entering the water in most outdoor pools applications, you need to have a theoretical residual ozone concentration of 0.07 ppm, as we have learned from our 40 m3 test pool which we run for over eight years without a drop of chemicals. An indoor pool will most likely work well with 0.05 ppm of residual ozone as indoors, you do not have organic dust, pollen, etc., blown into a pool by the wind, dramatically increasing bio load and ozone demand.

The following are ozone generator size calculations for a 55 m3 swimming pool:

To create 0.07 ppm ozone concentration in ice-cold water, you must dissolve 0.07 g/m3(ppm) x 55 m3 = 3.85 g of ozone.

Most pool ozone systems installers use this method to calculate the size of a generator, which is why they do not work. You have to use chlorine, plus low ozone concentration produced by poor-quality pool ozone generators does not allow to dissolve more than 10-30% of ozone from the total produced.

In reality, these calculations have to be extended to find the real size of the generator required: At 25˚C, the half-life of ozone in water is ~15 minutes (0.25h). To compensate for natural ozone decay in the water, you will need to dissolve 3.85 g ÷ 0.25 = 15.4 g/h

Check this article, Sizing of Ozone Equipment, for more information.

Overall, ozone pool systems offer many benefits over traditional pool sanitization methods. While the initial installation cost may be higher, the long-term benefits, including effective sanitization, safety, eco-friendliness, and cost-effectiveness, make it a worthwhile investment for many pool owners.

Are you interested in learning more about 50kg Ozone Generator supplier? Contact us today to secure an expert consultation!