How To Measure Gas Dissolution Efficiency
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How To Measure Gas Dissolution Efficiency

Views: 329     Author: Site Editor     Publish Time: 2024-10-31      Origin: Conway et al;Conway et al;Casey et al;Haarhoff et al

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How To Measure Gas Dissolution Efficiency


Dissolution gas efficiency measurement technology

In the flotation process, the better the performance of the flotation equipment, the greater the degree to which the gas will dissolve in the water under a certain pressure, the smaller the bubbles that can be released through the release device, and the greater the number of bubbles participating in the flotation process. Regardless of the new type of flotation system, being able to ensure a high gas dissolution efficiency is one of the essential performances of the system.


According to the literature, the determination of gas dissolution efficiency is mainly divided into two categories:


One is to measure the amount of gas released from the dissolved water after pressurized dissolution and decompression release, which can be measured with the help of a gas flow meter;


The second is to measure the total amount of gas dissolved in the water under pressure, which can be measured intermittently by liquid replacement.


Bratby and Marais [1]first studied a method for continuous measurement of gas release, as shown in Figure 1.10. Part of the water outlet of the dissolved air system enters the flotation tank under the control of a needle valve, and the other part is connected to the measurement device under the control of a needle valve. An air flow meter is installed on the top of the device, and the gas release amount is measured by observing the gas flow rate over a certain period of time.


Figure 1.10 Continuous measurement device for gas release

Figure 1.10 Continuous measurement device for gas release

(1- dissolved air water inlet; 2- needle valve; 3- air flotation column; 4- measuring column; 5- rubber stopper; 6- air flow meter; 7- water level line)


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Conway et al. [2] proposed an intermittent measurement device that used the liquid displacement method to conduct experiments (see Figure 1.11).


The gas released by the needle valve was collected and introduced into an inverted water-filled burette. The lower side of the burette was connected to release the collected gas, and the upper side was attached to the air.


The liquid level of the burette was adjusted up and down to make the air pressure in the tube the same as the atmospheric pressure. The gas released was determined by measuring the water overflowing from the right side.


Figure 1.11 Intermittent measurement device for gas release

Figure 1.11 Intermittent measurement device for gas release

(1-pressure gauge; 2-gas release column; 3-dissolved gas water inlet; 4-overflow flow measurement; 5-250mL inverted burette; 6-2L measuring cylinder; 7-valve)


Casey et al. [3] improved the liquid replacement method of Conway et al. by changing the dissolved air water sampling to one under pressurized conditions. The other measurement systems were consistent with those of Conway et al.


Haarhoff et al. [4] also designed a method based on their predecessors that can measure both the dissolved air efficiency and the composition of dissolved air. They can directly measure the amount of dissolved air, as shown in Figure 1.12.


Figure 1.12 Gas release measurement device

Figure 1.12 Gas release measurement device

(1-water inlet; 2-air; 3-water inlet valve; 4-bracket; 5-nozzle; 6-isolation plate; 7-plexiglass column; 8-scale measuring column; 9-valve; 10-overflow pipe; 11-funnel; 12-dissolved oxygen meter)



There are many methods to measure dissolved gas efficiency. In actual production operation, the part of bubble water released by the sudden pressure drop is what really acts on the water body. When measuring dissolved gas efficiency, the amount of gas in this part should also be measured;


In addition, if the measurement is made directly under pressure, the pressure in the device is higher than the atmospheric pressure. The pressure in the measurement process is unstable, and the error is significant. Therefore, using the liquid replacement method after the release is more convenient.



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References:

[1] Bratby J, Marais G V R. Saturator performance in dissolved-air (pressure) flotation[J]. Pergamon, 1975, 9(11): 929-936.

[2] Conway R A, Nelson R F, Young B A. High-solubility gas flotation[J]. Journal(Water Pollution Control Federation), 1981, 53(7): 1198-1205.

[3] Casey T J, Naoum I E. Air saturators used in dissolved air flotation processes[J]. Water Supply, 1986, 4: 69-82.

[4] Haarhoff J. Dissolved air flotation: progress and prospects for drinking water treatment[J]. Journal of Water Supply: Research and Technology-Aqua, 2008, 57(8): 555-567.




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