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03.11.2025
Wastewater Plant in New Zealand Benefits From Rotary Lobe Pump
Pumps play a crucial role in various phases of wastewater treatment. By switching from centrifugal pumps to a rotary lobe pump, wastewater treatment plant operators in New Zealand could optimise their process.
In the interview, Harsh Vardhan, Sales Manager NETZSCH Australia, discusses the challenges of wastewater treatment in sewage treatment plants and how several of the largest TORNADO® rotary lobe pumps from NETZSCH Pumps & Systems optimised the process at a sewage treatment plant in New Zealand.
Challenges in wastewater treatment
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A central component of wastewater treatment in most wastewater treatment plants is the MBR process (membrane bioreactor). This is where the wastewater is treated using a combination of biological cleaning and membrane filtration to achieve an exceptionally high water quality. For this process, the pumps must handle high flow rates and low NPSHa values. Furthermore, they must be able to handle changing viscosities.
Rotary lobe pump replaces centrifugal pumps
“Since our NETZSCH rotary lobe pump can be reversibly used, it can be used in the wastewater treatment plant for water extraction and membrane cleaning.”
Centrifugal pumps are often the preferred technology used in wastewater treatment plants. However, centrifugal pumps have a significant disadvantage. Even small changes in the properties of the medium, such as its viscosity, can significantly reduce efficiency. “This is where the rotary lobe pumps come into their own because fluctuating viscosity is not a problem for them”, explains Vardhan. They can also handle a low NPSHa value and high flow rates. “Since our NETZSCH rotary lobe pump can be reversibly used, it can be used in the wastewater treatment plant for water extraction and membrane cleaning. This has allowed us to replace two centrifugal pumps with a rotary lobe pump”, says Vardhan.
In the interview, the Sales Manager talks about further advantages of rotary lobe pumps from the global specialist in handling complex media in wastewater treatment and explains how to benefit in terms of time and costs when it comes to maintenance.
