Membrane filtration is a procedure which utilizes the physical barriers, such as water-permeable membranes, to separate particles from the water to be cleaned. A water treatment plant in Beijing uses 14 Boerger Rotary Lobe Pumps in its membrane filtration system. The pumps achieve a total output of up to 10,000 m³/h. The pumps extract the water to be purified through the membranes. The membranes have tiny pores through which the water permeates. Solids, bacteria etc. are retained by the membranes and therefore separated from the water to be purified.
Cleaning the membranes includes techniques such as periodical back flushing with filtered water. This made it essential for the operator of the plant to have pumps that could also be operated in reverse. They also had to have a high suction capacity. As the filtration operation needed different quantities to be pumped than in the back flushing phase. The speed of the Boerger Rotary Lobe Pumps is regulated by a frequency converter.
The Boerger Rotary Lobe Pumps are extremely stable and practically wear-resistant. However, in the event of wear, the low maintenance design of the pump (MIP = Maintenance in Place) enables pump maintenance to be performed by the customer's in-house personnel in a very short time. This keeps downtime and maintenance costs to a minimum.
|Börger||Rotary Lobe Pump|
|Rated capacity||450 - 720 m³/h (1980 - 3168 usgpm/h)|
|Speed||470 -720 rpm|