Design elements of jet injectors for ozone dosing

The required ozone quantity and dosage are determined by the customer based on test data for specific projects and the ozone gas concentration specified by the ozone manufacturer. This article addresses the design considerations for ozone mass transfer under conditions of guaranteed ozone supply quantity, concentration, and supply pressure.

1. Ozone transfer efficiency ηo₃

ηo₃ = Ozone demand / Ozone supply

Ozone mass transfer is affected by a series of factors, including water depth, air-to-water ratio, residence time, water quality, pH, water temperature, water pressure, and ozone concentration. Water quality, pH, and water temperature are determined by the customer's specific circumstances. This guide discusses the selection and efficiency optimization of water depth, air-to-water ratio, and residence time.

2. Water depth

The impact of water depth on ozone transfer efficiency is obvious. The deeper the water, the higher the ozone transfer efficiency, and vice versa. However, deeper water means greater infrastructure investment.

3. Air-to-water ratio

The gas-to-water ratio refers to the ratio of the amount of ozone oxygen drawn into the jet injector to the amount of motive water. Under conditions of constant water depth and jet injector inlet working pressure, a smaller gas-to-water ratio results in higher ozone transfer efficiency. With a fixed air supply, more ozone is actually transferred into the water. This means that a smaller ozone generator and less oxygen supply can be used. However, a smaller gas-to-water ratio, with a fixed air supply, requires a larger circulating water volume, necessitating a larger pump and higher power output for the jet injector.

4. Import pressure

With a fixed water depth and air-to-water ratio, the higher the working pressure at the jet injector inlet, the higher the ozone transfer efficiency, and the higher the corresponding power of the jet injector circulating water pump.

5. Summarize

Therefore, when designing and selecting equipment, it is necessary to comprehensively balance the water depth, gas-water ratio, inlet and outlet working pressure, and overall operating costs while ensuring the ozone dosing effect, so as to control the operating costs to the minimum.