The segment from WaterOnline Radio features interviews with John Franz, wastewater treatment plant manager for the City of Anacortes, WA, as well as Kevin Grant, a regional sales manager for Aerzen USA.
Aerzen USA insights and guidance for blower, compressor and vacuum pump applications
A biological municipal wastewater treatment plant with a considerably fluctuating discharge quantity can only perform its function with utmost energy efficiency and reliability if the process air consumption of the aeration basin can be adjusted continuously and is fully automated in order to deal with widely fluctuating load quantities. The example of the wastewater treatment plant shows how this is achieved with the use of a speed controlled Aerzen turbo blower.
Three main blower technologies are condsidered for waste water treatment applications:
Turbo Blowers. Positive Displacement Blowers. Hybrid Rotary Lobe Blowers. Which one should you choose for your wastewater treatement application? How much energy can you really save? Who can you trust to give you an objective answer? The best place to start is by downloading the Engineer's Mini-Guide To Blower Technology Selection.
In order to properly size a blower system with a vacuum pump, there are five main requirements to consider:
The most common motor start is what is commonly known as “across the line” (direct) motor start. Power companies like when consumers do this as the resulting power draw (Amperage) spike is typically assessed with so called power demand charges on top of the regular power consumption charge in cents/kWh. In any application where the blower or compressor must start against header pressure this starting method carries the greatest penalty as the motor must overcome the rotating equipment’s moment of inertia and the system pressure. The graph below illustrates the power draw and the time it takes to bring the blower / compressor on line. An Aerzen Aeromat automatic start-up unloading valve may be the answer to your problem.
Is the blower sized for the correct amount of air? Too much air will lead to higher pressure drops and increased power consumption. Too little air will result in line plugging.
- Is the blower and motor sized with enough safety to overcome upset conditions?
- When comparing blowers from various manufacturers, did you look at:
- Maintenance requirements
- If you are conveying food products, you also want to make sure that no particles of the silencer absorption material and no lubrication oil can enter the compressed air stream and thus mix with the conveyed product.
Feel free to comment or contact me to discuss.
Karl Mueller - Industrial Specialist
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