dissolved oxygen

Dissolved oxygen or DO refers to the level of free, non-compound oxygen present in water or other liquids. The DO value is important parameter for your water quality and the process where you use the water for. An ultrafine bubble or nanobubble is not dissolved oxygen a bubble is a gas cavity in water or another liquid. 

Conventionally aeration is a technology to increase the DO value in water. Now with the nanobubble technology we have two levels to increase the oxygen in water, the first levels is the dissolved oxygen and the second levels is via bubbles or gas cavities in water. For this reason we also call nanobubble generation an enhanced aeration technology.

The dissolved oxygen level is influenced by the following factors:

  •   Temperature of the water
  •   The salinity of the water
  •   The altitude of operation (atmospheric pressure)
  •   Biology in the water by respiration of fish and plants

The relationship between water temperature and DO is inverse: Cold water is able to hold more DO than warm water. The ultrafine bubble generators on this website pressurize gas and liquids and for that reason they are able to oversaturate the water. In nature under normal conditions a saturation level of 100% is the maximum. 

Air contains 20.95% oxygen. At standard barometric pressure (760 mmHg), the pressure or 'tension" of oxygen in air is 159 mmHG (760 x 0.2095). The pressure of oxygen in air drives oxygen into water until the pressure of oxygen in water is equal to the pressure of oxygen in the atmosphere. When pressure of oxygen in water and atmosphere are equal, net movement of oxygen molecules from atmosphere to water stops. The water is than in equilibrium or at saturation, with dissolved oxygen (DO) when the oxygen presssure in water equals the pressure of oxygen in the atmosphere.

PPM versus mg / L

We often get the question what the difference between DO ppm is versus DO mg/L. At first it looks two very different forms of measurement. They are both ratios, and to see how they align with each other, it’s easiest to start with ppm, or parts per million. As an example, let’s say you’re trying to determine the salinity of seawater, and you get a reading of 36,000 ppm; that simply means that for every million parts of water, there are 36,000 parts of salt.

What are parts? Parts can be any measure. Liters, buckets, or a drop of water (orange juice, gasoline, etc.). The size of the sample is irrelevant. It’s the RATIO of the tested parts (salt) to the total number of parts (seawater) that’s important. It’s easy to grasp ppm, but how about mg/L?

A liter of water (which is a metric measure of volume, or capacity) weighs 1 kilogram. That’s 1,000 grams. Now think about a milligram. It is 1/1000th of a gram, making it 1/1,000,000 th of a kilogram. Put another way, a liter of water weighs 1,000,000 milligrams. One million milligrams… see where this is going? For our purposes, 36,000 milligrams/Liter is the same measurement as 36,000 parts per million.* Both measurements tell us how many parts (milligrams) are present in every million parts (Liter).

In reality, for these measurements to be perfectly equal, they must be taken with pure water at standard temperature and pressure. Most testing instruments include an automatic temperature compensation feature (ATC) which corrects for this difference.

DO values table

Dissolved oxygen values saturation point and over saturated values

TemperatureDO (mg/L)DO (mg/L)DO (mg/L)DO (mg/L)DO (mg/L)
(degrees C)100.00%200.00%300.00%400.00%500.00%
014.629.243.858.473
114.1928.3842.5756.7670.95
213.8127.6241.4355.2469.05
313.4426.8840.3253.7667.2
413.0926.1839.2752.3665.45
512.7525.538.255163.75
612.4324.8637.2949.7262.15
712.1224.2436.3648.4860.6
811.8323.6635.4947.3259.15
911.5523.134.6546.257.75
1011.2722.5433.8145.0856.35
1111.0122.0233.0344.0455.05
1210.7621.5232.2843.0453.8
1310.5221.0431.5642.0852.6
1410.2920.5830.8741.1651.45
1510.0720.1430.2140.2850.35
169.8519.729.5539.449.25
179.6519.328.9538.648.25
189.4518.928.3537.847.25
199.2618.5227.7837.0446.3
209.0718.1427.2136.2845.35
218.917.826.735.644.5
228.7217.4426.1634.8843.6
238.5617.1225.6834.2442.8
248.416.825.233.642
258.2416.4824.7232.9641.2
268.0916.1824.2732.3640.45
277.9515.923.8531.839.75
287.8115.6223.4331.2439.05
297.6715.3423.0130.6838.35
307.5415.0822.6230.1637.7
317.4114.8222.2329.6437.05
327.2814.5621.8429.1236.4
337.1614.3221.4828.6435.8
347.0514.121.1528.235.25
356.9313.8620.7927.7234.65
366.8213.6420.4627.2834.1
376.7113.4220.1326.8433.55
386.6113.2219.8326.4433.05
396.5113.0219.5326.0432.55
406.4112.8219.2325.6432.05
416.3112.6218.9325.2431.55
426.2212.4418.6624.8831.1
436.1312.2618.3924.5230.65
446.0412.0818.1224.1630.2
455.9511.917.8523.829.75

search results

18 result for dissolved oxygen

    Control and Monitor Dissolved oxygen levels

    Dissolved ​Oxygen Control ​System: DO controller for applications that require a high accuracy of dissolved oxygen levels such as aquaculture and water treatment aeration. In combination with the DO controller achieve an optimal environment with energy savings by running the equipment for the minimum time required by the settings.


    Turbiti submersible nanobubble mixer

    Large volume submersible ultrafine bubble generator in combination with a dissolved oxygen generator, for aerating effectively lakes, horticulture, fishponds and shrimp cultivation. Aeration is for many biological processes very important the Acniti submersible unit guarantees high DO values for ideal biological activities creating an optimal environment for high production output.


    Ultrafine Bubble Monitoring ALT-9F17

    Low cost Ultrafine Bubble Monitoring ALT-9F17 system, to measure reliably the concentration of ultrafine bubbles (nanobubbles) in your water.


    Turbiti nanobubble mixer OEM

    Combined with the benefits of a static mixer Acniti has implemented their proprietary swirl flow technology to generate efficiently and effectively nanobubbles. The turbiti OEM series gives dealers and partners the opportunity to implement the turbiti into their own equipment and sell nanobubbles generator equipment under their own brand name. This product is only for dealers and partner of acniti, that have a license agreement and commit to buy certain quantities.


    Finebubble technology is an exciting innovative technology that has potential applications for many industries

    Bubbles are all around us, in our foods, beer, pop drinks bread and cheese, but also in the bricks of our house. Bubbles are gas-filled cavities in water, the lifetime of a bubble is short at most a few minutes, only ultra-fine bubbles are stable for longer periods like months, that is making them very special and that enables us to change the properties of water.


    Probiotics water treatment by powerful micro-organisms and bacteria

    Algae blooms are often a reason to start pond remediation. Probiotics in combination with ultra-fine bubbles can increase the efficiency of the wastewater treatment process. Acniti supplies probiotics in tablet form an easy and safe way to dose and apply the beneficial bacteria.


    Ultrafine Bubbles and the effect on Seed Germination but also on wiskey and beer malting

    Nanobubbles are useful in accelerating the metabolism of living organisms, but the mechanism is not yet well understood. In a study, they investigated the production of reactive oxygen species (ROS) by Nano Bubbles and the effect on seed germination. The conclusion of the study was seeds in nanobubble water had a higher germination rate than all those submerged in the different other conventional used solutions.


    Proven get laundry clean with a bubble boost

    Washing of surfaces and laundry is one of the promising areas were ultrafine bubbles can make a difference in the application. Reducing the amount of detergent, has a positive effect by reducing pollution, washing laundry without detergent, would greatly benefit the environment. Ultrafine bubbles can lower the surface tension of water, the large amounts of oxygen molecules in bubbles charge the water negative.


    Different Bubbles sizes and why it matters to the properties

    Bubbles are gas filled cavities in water. The contact area between bubbles in water filled with tiny bubbles is much larger than water filled with bigger bubbles. The gas pressure inside a small bubble is higher than in a large bubble, therefore the surface tension of a small bubble is higher as well.


    lab demonstration miniGaLF

    The miniGaLF is ACNITI`s entry level GaLF model designed for companies, universities, research institutes and individuals that want to learn about Ultrafine bubble technology. In this blog a movie is shown of the connections and the performance to create ultrafine bubble (nanobubbles) with high DO water.


    high concentration nanobubble unit selector

    Selecting a nanobubble generator can be a daunting task when you are new to the technology. In the following article we explain the differences of the various units. This helps you to select the best nanobubble generator for your research, application development or ultrafine bubble production.


    Partner Foreport Taiwan: Good results growing young plants with oxygen nanobubbles

    Acniti partner Foreport in Taiwan conducted a vegetables young plant cultivation trial, irrigating with oxygen nanobubbles. The nanobubble irrigation water had a DO of 20 ppm versus the regular irrigation water which had 6.8 ppm. After 6 weeks results were taken it was concluded that the crop treated with nanobubbles was 25-30% heavier. The nanobubble irrigated crop also had a better developed root system which will lead to less root diseases and better survival rates during hot summers.


    Tiny bubbles help flower growers in the hot summer

    Carnation flower growers in Japan use nanobubble irrigation technology against fusarium, withering and dying plants, to improve stem quality, flower size, shoot count, volume of stems and growth speed. In the growing season 2017 / 2018, acniti conducted trials, the test area had irrigation water with billions of ultrafine bubbles of an average size of 110 nm and high DO water with 30 mg/l.


    The zeta-potential important stuff for nanobubbles

    The electrical properties of gas bubbles are important in determining the interaction of nano-bubbles if and when they merge together and how they interact with other materials such as solid particles or oil droplets. Knowledge about this helps application development in for example, protein skimmers, froth flotation, food processing, washing surfaces and purification.


    Turbiti O2 land-based nanobubble mixer enhanced aeration technology

    The Turbiti O2 is the multipurpose ultrafine bubble generator suitable for agriculture, horticulture and fish cultivation sites. Super saturation of oxygen for water day storage tanks in horticulture. Drinking water solutions for chicken, cows, pigs and horses, giving high DO water with ultrafine bubbles to animals with enhance their food digestion more efficiently and results in healthier animals.


acniti is specialized in the sales and marketing of ultrafine bubble and nanobubble technology, to accelerate growth.

Bubble technology is the next revolution in water and liquids to change their properties by dissolving gases to enhance biological processes, to innovate cleaning and disinfection in a wide range of applications.

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Minoh Osaka
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