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Application of ozone sterilization in aquarium water treatment

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Ozone is a green disinfectant, because it becomes oxygen after sterilization, which is beneficial to organisms, so it is widely used in water treatment and sterilization. There are three principles of ozone generation.


1. Ultraviolet Principle
2. Principle of Corona Discharge
3. Principle of electrolyzed water


Ultraviolet rays and electrolyzed water can only produce a small amount of ozone, so their use is restricted. The principle of corona discharge to produce ozone is expressed by the formula: E=U/D(E=F/q, E=KQ/r2), P=I2R, E is the electric field intensity generated by static electricity, when E is greater than the ionized air At the critical value of the field strength, air ionization begins, that is to say, the air becomes a conductor, with free electrons in it, and the electrons are free from the bondage of the nucleus, oxygen molecules decompose into oxygen atoms, and oxygen atoms quickly produce ozone with oxygen. .


Specific to the application of ozone to the water treatment of the aquarium, it mainly has the following four aspects


1. Sterilize seawater: Ozone has a strong killing effect on bacteria, molds and viruses. It has (high sterilization rate), fast (sterilization is 3000 times that of chlorine), and broad-spectrum (ozone is almost harmful to all bacteria and viruses. , Molds, fungi and protozoa, oocysts have obvious inactivation effects), no secondary pollution characteristics. Its mechanism of action is: acting on the cell membrane causes the permeability of the membrane to increase, and the intracellular material flows out. Acting on the enzymes necessary for cell activity, causing its activity to be lost, and destroying the cytoplasmic genetic material and viruses.


2. Degradation of organic matter in water: It can effectively degrade organic matter in water and reduce chemical oxygen demand (COD) and biochemical oxygen demand (BOD). Due to the respiration and excretion of marine organisms and the deposition of residual bait in the aquarium water body, the continuous accumulation of organic matter in the water body has a sharp decline in dissolved oxygen, and the water quality gradually deteriorates. Whether the organic matter in the water body can be degraded is closely related to the health of the aquarium organisms. This machine effectively degrades organic matter in water and improves water quality through strong oxidation and coagulation aid.


3. Removal of ammonia nitrogen and nitrite in water: it can degrade ammonia nitrogen and oxidize nitrite in seawater. Ammonia nitrogen is composed of NH4+ and NH3. NH4+ is non-toxic and can be directly absorbed by organisms, but NH3 is toxic, causing fish poisoning and even death. Nitrite is an intermediate product in the nitrification process, which is easily toxic to fish. Adding ozone has a strong degradation and oxidation effect on ammonia nitrogen and nitrite, and the product is nitrate which is beneficial to marine organisms. Nitrochloric acid is the final product of nitrification, which is non-toxic to nursery larvae and can be directly absorbed by phytoplankton. The normal progress of nitrification in water plays an extremely important role in the improvement of water quality.


4. Oxygen increase: Oxygen increase in water body. After the ozone is decomposed, there is no residue, but it is decomposed into oxygen, which increases the oxygen content in the water and promotes the growth of fish.


There are two stages of adding ozone in the water treatment of the aquarium, namely the protein separator and the degassing tower stage; the three key points of adding ozone


1. Addition of ozone
2. Contact time of ozone
3. How to add ozone


The amount of ozone added in the water treatment of the aquarium, the empirical value of the protein separation stage is 5 grams of ozone per ton of water, the method of addition is a Venturi jet, the contact time T=V/Q (V is the volume of the protein separation tank, Q is the amount of water inflow); the purpose of adding ozone in the degassing tower stage is to disinfect and sterilize, the concentration of ozone is 4ppm-5ppm (the concentration of ozone water, CO3 1ppm=1.0g/m3), the detection standard of ozone sterilization is the CT value, and C is Ozone concentration, T is the retention time after the concentration reaches the standard. If any one of the two cities does not meet the standard, the sterilization effect cannot be guaranteed.


The decay rate of ozone in water hours is 61%
The working efficiency of the ozone generator is 75%
Your hourly water volume is V cubic meters
The concentration of ozone is required to be B
The hourly output of the ozone machine is Y


Y=BxV/(1-61%)x75%, y>1kg, for the stability of the ozone sterilization system, we need to use the ozone mixing system including air compressor, filter, cold dryer, adsorption dryer, oxygen Machines, ozone generators, mixing tanks, jets or gas-liquid mixing tanks, ozone water detectors and space detectors, alarms, etc.


At present, there are two technical difficulties in the application of ozone sterilization to water treatment. One is solubility, because the higher the solubility, the lower the cost of the ozone sterilization system, and the other is the precise control of the ozone system concentration, such as the difference between 0.05ppm and 0.01ppm. It is clear




CE Environment Technology Co., Ltd


Tel: 0799-6828880 Skype:yamsole
Email: jesse@ceenvironment.com Site:www.ceenvironment.com
Add: 610-2 Room, Guangfeng Mansion 118#, Suzhou East Street, Economy & Technology developing district, Pingxiang, China

Edited by Jessesun
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@Jessesun Thank you for the informations above. 


I have a question.  O3 can destroy the cells membrane. 

Has the ability also to kill the beneficial bacterial (Nitrosomonas.sp / Nitrobacter.sp ) ?

If yes, what it will happen in the nitrogen cycle in a stable aquarium that it runs a few years? 

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First, ozone sterilization, the first thing to ensure is to eliminate harmful bacteria
Second, there are additional points for ozone sterilization in the water, and the concentration is very low but the sterilization is fast. This is supported by the data. At the same time, the ozone decomposes quickly in the water, and 61% becomes oxygen in one hour.
Third, the measured data supports that the fungi of Nitrosomonas/Nitrobacter beneficial to water have a certain antioxidant capacity against ozone. (Many factors, temperature, PH value, ozone concentration, time, pressure, etc.)

The point is that we use ozone to sterilize, focusing on the elimination of harmful substances. Substances that are not beneficial are usually considered less or not considered. (The same goes for ultraviolet rays. Irradiation to sterilize, no matter what kind of bacteria it is, it will be irradiated)

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