Factors in selecting jet aeration systems

Under conditions where the oxygen demand has been determined, jet aerator selection is an optimization process that balances capital investment and operating cost. Chengdu Lvsui Technology Co., Ltd. can provide customers with jet aerator selection and layout design services to achieve an optimized configuration of investment and operating costs, thereby reducing the overall cost of wastewater treatment.

In the specific selection process, we mainly consider the following factors:

1. Working Pressure of the Jet Aerator
The greater the water flow rate, the higher the working pressure of the jet aerator, and the more air it can entrain. Under a specific oxygen transfer requirement, fewer jet aerators may be needed, which lowers equipment procurement cost. However, because higher pressure requires greater pump power and reduces power efficiency, the operating cost will increase.

2. Operating Water Depth
Jet aerators are suitable for any water depth. As the water depth increases, both oxygen transfer efficiency and power efficiency improve, and hydraulic power can be reduced, resulting in lower operating costs, as shown in Figure 2. However, greater water depth will also increase civil construction costs.

3. Number of Jet Aerators
Increasing the number of jet aerators can reduce the required supporting power. Although the initial investment will rise, the operating cost will decrease.

4. Suction Pressure and Altitude
The air intake capacity of a jet aerator is determined under the condition of one atmosphere. When the suction pressure is lower than one atmosphere, it should be corrected by the factor:
Correction factor = vacuum pressure / 1 atmosphere
When the suction pressure is higher than one atmosphere, it should be corrected by the factor:
Correction factor = (gauge pressure + 1 atmosphere) / 1 atmosphere

5. Gas-Liquid Ratio
The higher the gas-liquid ratio, the more gas is entrained per unit volume of water. This improves power efficiency but reduces oxygen transfer efficiency. When the gas-liquid ratio reaches 60% to 80%, however, the increase in power efficiency becomes gradual. The reason is that smaller bubble diameter and better bubble distribution in water are generally achieved at lower gas-liquid ratios. Therefore, in pure oxygen aeration, it is not recommended to pursue higher gas-liquid ratios solely for better power efficiency. Instead, an optimal balance point should be identified to consider both oxygen utilization efficiency and oxygen transfer power consumption.

In addition to the factors above, water temperature, salinity, operating dissolved oxygen concentration, and the chemical properties of the water will also have important effects on the selection of jet aerator model, quantity, and supporting power.

Contact Information

Company Website: https://cd-greenwater.com
Technical Contact Number: 028-85130135
Customer Service Contact Number: 18515915124
Contact Email: jane1984@cd-greenwater.com
Address: No. 191, Section 1, Changcheng Road, Xihanggang, Shuangliu District, Chengdu