Chopping

At a waste water treatment plant, static thickened sludge with a DS content of 4% needs to be pumped to the centrifuge. This task is performed by two Börger Rotary Lobe Pumps . The pumps feed the centrifuge at controlled speeds via a frequency converter in alternating operation. The sludge contains a high proportion of solids, fibers and clumps.

To prevent blockages at the inlet of the centrifuge and to protect the pumps, a Börger Multichopper was installed in front of the Börger pumps for dealing with the solids. This chops fibers, solids and clumps in the sludge, as well as homogenizing at the same time. The reversing control unit supplied ensures smooth operation by changing the direction of rotation if a jam occurs.

Technical data

A pneumatically operated waste water treatment pumping station is also driven with a rotary pump. The suction side of the Boerger Rotary Lobe Pump was kept separate and positioned so that foreign objects such as stones, were not able to get into the pump. The pressure side is connected to the pressure pipe of the tank. Shutter valves and check valves lock systems against one another. Both systems are regulated via an SPS control unit.

Technical data

The dry substance content had increased due to a certain process at a waste water treatment plant. Since then, faults had occurred at several points in the pump due to solids accumulating and blocking the pumps. The blockages were causing frequent damage.

After successfully conducting different tests, they opted for the Boerger Multicrusher for dealing with the primary sludge. The Multicrusher was installed on the suction side of the two primary sludge pumps which transfer the sludge alternately.

Operating safely chopping performance and the reasonable wear parts were decisive in convincing the waste water treatment operator. Since the Multicrusher was installed, the primary sludge pumps have been running smoothly.

Technical data

A waste water treatment plant was having serious problems with the build-up of clumps in their sludge. The choppers installed were not able to cut up the voluminous clumps in a passable size. This caused constant blockages in the rotary pumps which were supposed to keep the contents of the digestion tower circulating. The operator of the plant decided to try out a Boerger Rotorrake. The Rotorrake is a robust chopper. Blades and counter blades are mounted one after the other on the carrier shaft.

The Rotorrake was tested intensively for a long period of time. During that time, no problems occurred with the Rotorrake and no signs of wear could be detected on the blades or counter blades after the test phase.

Technical data

Contaminated sludge is delivered by tanker to a waste water plant which is then treated in the facility. The sludge is conveyed under pressure from the tanker into the plant. Due to the very low pressure, solids in the sludge persistently stick in the pipe line and cause it to block.

To chop these solids and prevent more blockages, the operator of the waste water treatment plant installed a Boerger Multicrusher. The Multicrusher is mounted on a hand cart and equipped with a small rock trap for extracting non-floating solids (such as metal parts) and is connected between the tanker and treatment plant.

Since the operator has been using the Boerger Multicrusher, there have been no more incidents due to pipe blockages when discharging from the tanker.

Technical data

A treatment facility was experiencing persistent problems with a rotary pump in a pumping station.

The communal waste water is collected in a sedimentation tank. Here the heavier solids fall to the bottom and are removed. A rotary pump conveys the waste water from the tank to a water treatment facility. However, the waste water still contains solids in the medium that kept blocking the rotary pump. A solution was needed. A Börger Multicrusher was chosen and installed between the sedimentation tank and the rotary pump. Since the Multicrusher has been installed, pump downtime caused by solids has not occurred.

Technical data

A major manufacturer of human waste facilities specialized in the intake of waste water from areas which are not connected by a sewer system. The waste water is delivered in tanker vehicles and often contains solids and fibers. Previously, the solids were separated from waste water by grids. However, blockages kept occurring from the solids, causing more maintenance work. The solids also had to be disposed of separately which presented an additional cost. The operator then decided to chop the solids when waste water entered the system. By chopping the solids, a higher gas yield could be achieved in the digestion towers as well as having an overall positive biological impact. 

The customer chose a Börger Multicrusher to do this, due to very limited space restrictions in the standardized human waste facility, the Multicrusher had to be very compact. It was decided to run the Multicrusher with a helical bevel geared motor with direct coupling.

This had the benefit of being easily maintained. The Multicrusher was also fitted with a rock trap. To avoid any obstinate solids from blocking the chopper, the Multicrusher has reversing control. 

The operator of the facility is highly satisfied with the Börger Multicrusher.

Technical data

A landfill leachate treatment plant had persistent problems with solids in the leachate. Following a detailed investigation, it became obvious that just a mechanical destruction of the agglomerates would ensure trouble-free system operation. During a test phase of several months, it became obvious that a Börger Multichopper chopped the agglomerates so efficiently that no agglomeration occurred in the membrane filtration system any more. The customer decided to install the macerator permanently. Due to the minimum space requirements of the Multichopper an integration into the pipeline system of the plant was easily possible.

Technical data

A town had persistent problems with a blocked dirty water pump in a waste water pumping station. Toilet paper, wet paper and other toiletries accumulated in the channel and were flushed into the centrifugal pump and blocked it when it started to rain. Due to positive experience with a Börger flood pump, the customer opted for a Börger Multicrusher. The dry-installed dual-shaft grinder was mounted into the pipeline of the pumping station in front of the dirty water pump very easily thanks to the very compact dimensions. Since the Multicrusher was installed, the dirty water pump does not block any more.

Technical data