Calculation Method for Ozone Dosage

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The ozone dosage calculation is a critical process, especially in the water treatment and air purification industries. Calculating the ozone dosage requires considering multiple factors, including the volume of water or air being treated, the target ozone concentration, the initial conditions of water or air quality, and the ozone decomposition rate. The following are the general steps and considerations to ensure the effective and economical use of ozone.

Ozone Dosage Calculation for Water Treatment

Defining Objectives and Theoretical Ozone Demand
- Treatment objective: Determine the purpose of using ozone, such as disinfection, color removal, odor and taste control, organic matter removal, etc.
- Estimating theoretical ozone demand: Based on the treatment objective and water quality, estimate the required ozone dosage (mg/L). This typically requires laboratory testing or using empirical data from similar cases. For example, disinfection may require a lower dosage (e.g. 1–2 mg/L), while oxidation of organic matter may require a higher dosage (possibly up to 10 mg/L or more).
Volume to be treated
Calculate or measure the volume of water or air that needs to be treated.
Considering ozone utilization and decomposition
Not all ozone added can be effectively utilized, some will naturally decompose during the reaction process. Ozone utilization is usually influenced by system design and operating conditions. We use a coefficient of 1.06 to compensate for system efficiency losses or other factors.
Calculation formula
Knowing the volume of water and the theoretical ozone demand per unit volume of water, you can use the following formula to calculate the actual ozone dosage per unit volume.

The actual dosage of ozone added depends greatly on water quality, treatment objectives, and regulatory requirements. Here are some typical doses of ozone in common water treatment applications:

Table 1: Ozone Dosage for Various Water Treatment Industries
Application Industry	Ozone Dosage (g/m³)	Purpose
Drinking water	3	Ozone, in addition to sterilization and disinfection of drinking water, can also be used for decolorization, deodorization, algae control and improving water taste. It is environmentally friendly with no residuals, and avoids secondary pollution caused by chlorine dioxide.
Pure water	3
Mineral water	5
Tap water and secondary pressurized water supply	5
Beverage	3–10
Swimming pool	1–2	Disinfect and sterilize, decompose humus in water, stabilize water quality, decompose organic matters in water, eliminate the side effects of chlorides.
Hospital sewage	10–20	High efficiency, rapid disinfection and sterilization, kill all kinds of microorganisms.
Water reuse	5–10	Sterilization, disinfection, purification, deodorization, and no secondary pollution
Industrial waste water	Depends on the industry	It rapidly decomposes organic fuels such as fluorine and phenol in wastewater, deodorizes, removes harmful substances, and reduces COD.
Industrial cooling water	0.5–1	Sterilization and algae removal

Ozone Dosage for Space Disinfection

Calculating the ozone dosage required for space disinfection involves considering several key factors, including the size of the space to be disinfected, ozone concentration, contact time of ozone, and the decay rate of ozone in that environment. Here are the general steps and considerations for calculating the required ozone dosage:

Define space parameters
Determine the volume of the space, usually calculated by measuring the length, width, and height of the space.
Determine ozone concentration
The ozone concentration for disinfection typically ranges from 1 to 20 ppm. It is important to note that high concentrations of ozone can be harmful to humans, so ozone disinfection should not be carried out in the presence of personnel.
Calculate total ozone amount
Use the following formula to calculate the required total ozone amount (mg), knowing that 1 ppm = 2.14 mg/m³
Consider ozone decay and distribution
Ozone is unstable in the air and will gradually decompose into oxygen. Additionally, ozone distribution may be affected by space layout, furniture, air flow, and other factors. Therefore, it may be necessary to add more ozone in practical operations to compensate for these losses.

Here is a reference for the required ozone amount in different space disinfection applications:

Table 2: Ozone Amount Required for Disinfection in Different Spaces
Application	Category	Concentration ppm	Ozone Per mg/m³	Method Of Use
Disinfection	Medical instruments	20	50–100	20 ppm disinfection time 60 min (International YY0214.295)
	Cold room	6–10	15–25	Continuous start according to storage capacity and level of contamination, mainly to kill mould
	Food workshop	1–1.5	2.5–3.5	O₃ gas delivery after daily work off
	Wards, operating theatre	2.5–5	5.5–15	Turn on the machine when disinfection is required and check the total number of bacteria according to the standard.
	Work wear disinfection	10–20	25–50	Relative temperature around 90%, clothes hung on hangers.
	General premises	1–2	2.5–5	Regular start-ups
Anti Poisoning Preservation Freshness	Eggs	2–2.5	5–5.5	Intermittent supply of O₃ gas, 2–3 times a day
	Banana	2.5–3.5	5.5–8
	Apple	2	5
	Vegetables with little chlorophyll	1–1.5	2.5–3.5
	Fish, cheese	0.5–1	1.5–2.5
Deodorization Stink Purification	Morgue	3	7	Deodorise when there is an odour
	Fish processing plants	3	7	The polluted gas enters the treatment pipeline and O,gas is put into the pipeline to oxidise and deodorise. if the odour in the workshop is seriousO₃ gas should be put in the inlet of the workshop so that O₃ gas cannot be smelled.
	Slaughterhouse	2–3	5–7
	Fatty acid plants	10	25
	Rubber factory	3–10	7–25
	Rubbish waste disposal	10	25
	Sewage treatment plant	1–2	2.5–5

The above are references for ozone dosage in different water treatment purification and space disinfection applications. It is crucial to accurately calculate the ozone dosage for different industries to ensure the effectiveness, safety, cost-effectiveness, environmental friendliness, and adaptability of ozone applications. If you encounter any issues during the ozone dosage calculation process, please feel free to contact us.