Problems with blowers in aerobic tanks for wastewater treatment
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Dear experts, after the blowers in our company’s wastewater treatment tanks operate for a while, it happens that the blowers are running, but no aeration takes place in the tank; as a result, water flows out through the pipes at the blower’s intake. What kind of problem is this? Is there too much sludge in the pool? The equipment provider says it’s sufficient to place the shares above the water level – is that reasonable?
1. A check valve is not installed at the outlet； 2. The fan is running in reverse and there is no check valve installed at the outlet, or the check valve is malfunctioning ； 3. If no check valve is installed at the outlet, or if the check valve is malfunctioning, and the air duct is below the water surface or close to it, water will flow back due to siphoning effect when the fan is turned off ； 4. When multiple units are connected in parallel, the diameter of the vent pipe is larger than that of the air pipe; an excessive amount of venting can also cause water to be siphoned into the fan ； Please check and eliminate potential hazards.
1. A check valve is not installed at the outlet； 2. The fan is running in reverse, and there is no check valve installed at the outlet, or the check valve is malfunctioning. 3. There is no check valve installed at the outlet or the check valve is malfunctioning, and the air duct is below the water surface or close to it; thus, when the fan stops, water flows back due to siphoning effect ； 4. When multiple units are connected in parallel, an excessive amount of venting can also cause water to be siphoned into the fan ； 5. Fan issues: low air pressure and high operating temperature of the fan.
The wind pressure is too low; installing a bottom valve will result in a water column that is too high due to siphoning, preventing the fan from blowing air down
Did water back up into the air ducts after it stopped running? Just drain the condensate water at the lowest point of the duct
There is no check valve at the fan outlet, resulting in low air pressure.
Placing the blower at a higher height can prevent water from entering, but it does not solve the problem of low aeration volume. Check the rated air pressure of the blower – it must be greater than the water pressure; the pressure at a water depth of 1 meter is 10 kPa
It’s likely that the height of the air duct above the water surface is not sufficient, resulting in a siphon effect
A blower is also a type of centrifugal device, and its air volume is inversely related to the outlet pressure. The lack of aeration indicates that the outlet resistance is too high. Check whether it is caused by an excessively high liquid level in the tank, or by the blower being installed at too low a height.