Industrial waste water treatment
The operator of a waste water treatment plant was looking for a pump with dry-run capability for his flotation system. In the flotation system, substances on the surface of the flotation tank are suctioned off using a rotating suction arm.
Previously an eccentric screw pump had been used for this purpose. However, this pump had the disadvantage of needing extra water, to prevent dry running and required a lot of space and drive power.
The operator then opted for a Boerger Rotary Lobe Pump. In addition to its dry-run capability, its minimum space requirements, the wide choice of material and the low drive power, the customer was also impressed with the low maintenance design of the Boerger Rotary Lobe Pump.
|Börger||Rotary Lobe Pump|
|Rated capacity||50 - 90 m³/h (220 -396 usgpm/h)|
|Speed||250 - 420 rpm|
|Pressure||2 bar (29 psi)|
At a provider of solid wood and plywood, more than one hundred cubic meters of waste water is used in the production process every day. This water is cleaned in their own treatment plant. Part of this process is a flotation system. Here the impurities are caught in a dissolved air flotation unit.
The customer uses a multi-phase rotary pump to feed the flotation. In the narrow channels of the pump, solids build up and cause blockages. The Boerger Multichopper ensures that the solids are chopped up so that the medium can be easily pumped.
|Medium||Water with wood fibers|
|Throughput volume||10 m³/h (44 usgpm/h)|
Börger Rotary Lobe Pumps are installed on many pressure tankers for municipal and private service providers. The pumps all have very different tasks. The Boerger Rotary Lobe Pump is in a sewer flushing vehicle and extracts the waste water through a coarse filter installed on the vehicle.
The initial purification takes place in the coarse filter. The still unpurified waste water is then pumped into a centrifugal separator (cyclone). This cyclone separates other impurities (sand etc.). The clean water is then pumped to the storage tank in the vehicle and is then available for further use. The clean water is mainly used for flushing sewers.
Thanks to the reversibility of the pump, it can be used for other purposes. The pipe lines to the suction and pressure side of the pump are fitted with cardan couplings. If required these couplings can be connected to hoses or pipe lines. This then also allows the storage tank to be filled or discharged with clean water. Due to the option of reversing the pump direction, the pipe line systems are easier to set up in the vehicle.
|Börger||Rotary Lobe Pump|
|Pump output||30 - 50 m³/h (132 - 220 usgpm/h)|
|Speed||300 - 500 rpm|