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The total amount or concentration of pollutants discharged by pollution sources is very high, which does not meet the discharge standards and environmental capacity requirements. Therefore, in order to improve the quality and function of water environment, it is necessary to strengthen the artificial water treatment and put forward the design scheme of sewage engineering scientifically and rationally according to the local situation. Blower aeration process is a common process used in Sewage treatment plants in China. The most critical equipment is the blower.
Then choose a sewage plant blower according to the following principles: "Not the best, but the right one."
According to the scale of sewage treatment plant, treatment process, construction investment purpose, use conditions and social, environmental and economic benefits of the comprehensive selection of the most appropriate blower. Specific comments are as follows:
The most commonly used oil-free screw blower, used in sewage treatment of sewage aeration equipment. When selecting the type of oil-free screw blower, the pressure and air volume required by the fan must be understood according to the selection performance table on the fan sample to select the appropriate model. Fan pressure is the depth of the water in the sewage aeration tank plus one meter (loss of fan pressure must be considered), usually the designer's water depth. Even fan pressure, when the fan operating environment such as temperature, humidity and atmospheric pressure, when the altitude is not the same, oil-free spiral blower performance will change. For example, when used in Xizang region of China, the performance parameters on the fan selection performance table cannot be directly used in the design and selection, but the oil-free performance is converted by the state according to the actual use situation. Feed the screw fan into the parameters in the standard intake state, and then select the appropriate model.
The air volume of blower aeration is calculated according to the amount of sewage and the aeration time of sewage in aeration tank as well as the size of gas-water ratio. When the pressure exceeds the pressure of the equipped blower, the air volume of the blower will decrease as the fan pressure increases. When the water depth decreases, the pressure of the natural blower decreases with the decrease of water depth, and the air volume of the blower increases naturally. The pressure of the blower in sewage treatment aeration comes from the depth of the water in the self-aeration tank and the resistance in the pipeline, which means that the value on the pressure gauge of the blower can be said to be the resistance value in the aeration tank and the resistance of the blower in the pipeline has no pressure.
To sum up, in determining the blower pressure, it is only necessary to make the absolute pressure that the blower can reach under the standard condition equal to the sum of the losses of the aeration tank water deep pipe in the atmosphere.