Municipal waste water treatment

Mobile, self-priming Rotary Lobe Pump on a three-point hitch with PTO connection for quick use in the event of a flood, canal work, pumping station support, waste water treatment and for disaster relief. Suction and pressure hoses are installed in just a few minutes. The self-sufficient pumping station vehicle (such as Unimog, Truck or...) is perfectly suited for use in open fields.

Technical data

An eccentric screw pump was installed on the thickened sludge side of a water extraction centrifuge. The maintenance costs were proving far too high for the customer. The pump also had to be completely dismantled for any repair work to be done.

Once the new rotary lobe pump was installed, the pump drive with a frequency converter was controlled by a signal from the sensor (hopper). The auger feed drive is run by a manually adjustable gear motor. This auger feed ensures that the pump always receives the optimum inlet pressure and amount. The steep walls of the hopper also prevent the build-up of sludge.

Technical data

At a waste water treatment facility, lime enriched sludge is required for feeding  the chamber filter press. This sludge has the advantage of being an excellent filter in the press and ensuring a high DS content in the sludge which is pressed out. The Börger Rotary Lobe Pump conveys the lime milk to the sludge production of the high pressure pump.

Technical data

The operator of a waste water treatment plant wanted to store the grease collected in the sand trap in the digestion tower to achieve higher levels of gas production. The grease has different degrees of viscosity and is full of very different types of solids. The customer was looking for a robust and low-maintenance design and technology. Here Börger built a stone trap coupled to a chopper. The grease/water mixture then flows into a grease container where the mass is kept homogenized by an agitator controlled by a probe.The grease and water mixture is primed from the sand trap by a tanker and taken for removal. Once there, the mixture is pumped through the pipe via the stone trap using the Börger Rotary Lobe Pump in the tanker. The remainign solids are then chopped in the Börger Multicrusher. An additional Börger Rotary Lobe Pump conveys the mixture from the grease container straight to the digestion tower.

Technical data

The dry-installed, self-priming Boerger Rotary Lobe Pump extracts the partially thickened sludge from the primary clarifier. The rotary lobe pump has a built-in frequency converter which can adjust the required rated capacity perfectly. The vehicle trailer floor is equipped with grating to ensure the pump is always kept dry. The trailer can be be supplied with a tarpaulin and straps and is also part of the Boerger product range.

Technical data

A waste water treatment plant was looking for an alternative to its previous multi-phase eccentric screw pump to feed a chamber filter press. The reason for replacing the eccentric screw pump was the high maintenance and the high cost of spare parts and energy.

A Boerger twin-pack Rotary Lobe Pump was selected. This is two identical Boerger Rotary Lobe Pumps which are operated in series. Each rotary lobe pump has its own frequency converter. This allows the speed to be individually regulated for each pump. When feeding the chamber filter press, there is a choice between two phases - the pre-fill phase or the pressurized phase. During the pre-fill phase, large quantities of sludge are pumped into the chamber filter press to fill up its chamber. The Boerger pumps operate at high speed for this.

The increasing filling level of the chamber increases the counter pressure in the chamber filter press as the solids in the sludge have gathered in front of the filter screens. The pressure is recorded using a pressure gauge. The speed of the Boerger pumps is then reduced accordingly using the frequency converter. (Pressure phase) The customer is extremely pleased with the Boerger Rotary Lobe Pumps. The space-saving design, the outstanding pump output and the ease of maintenance all impressed the staff at the waste water treatment plant.

Technical data

A water treatment facility was having huge problems with an overflowing sewage collection tank. The water works operator decided to buy a Boerger FLA 2072 Rotary Lobe Pump to deal with the problem. 

The pump had to be self-priming and dry-run compatible as well as able to achieve a high pump output. It also needed to be resistant to any solids contained in the waste water. The customer is very satisfied with the Boerger pump.

The Rotary Lobe Pump is mounted on a trailer with tandem axle and run with a 45 kW electric motor. The unit is equipped with a frequency converter which controls the speed of the pump and is operated by a potentiometer installed in the control cabinet. This allows the rated capacity to be adjusted.

Technical data

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.

Technical data

A major waterworks company operates a community sewage treatment plant in conjunction with private companies. The grease sludge extracted from the grease trap is drained and transported to the digestion tower at a biological treatment plant.

Here the grease sludge is stored in a heated tank. It is heated up to 60-65°C to keep it sufficiently fluid able to be pumped. A Boerger Rotary Lobe Pump circulates the grease in the digestion tower when required. The tank with the pump is designed as a mobile unit to be used for feeding digestion towers in different operations. The Boerger Rotary Lobe Pump proved extremely beneficial here with its compact, low-on-space design.

The water works company is very pleased with the Boerger pump. The reliability of the Boerger pump and its long service life made the decision easy for the customer. The water works company now uses BoergerRotary Lobe Pumps in several of its treatment plants.

Technical data

To respond to a flood quickly and to react independently, a municipal construction yard responsible for flood protection was looking for several mobile pumps. It was important for them to have powerful, mains-free,  solids-resistant pumps which could be easily used anywhere. The customer chose three Boerger Rotary Lobe Pumps with PTO drive. Besides the proven quality of the Boerger Rotary Lobe Pumps and their high performance, it was the easy handing which was the decisive factor for the customer.  

Each compact rotary lobe pump is mounted on a three-point hitch. This standard three-point hitch can be mounted on an Unimog truck or a tractor at the front or rear of the vehicle and driven straight to the application site. Sufficient ground and off-road clearance is also provided to be able to drive through flooded or difficult terrain.

As this type of design does not have its own drive or need a chassis, it is a very cost-effective version. The pump is run using the vehicle's PTO. The customer is extremely satisfied with the three Boerger mobile pumps and well-equipped in the event of a disaster.

Technical data

A manufacturer of vacuum systems was looking for high-performance pumps for vacuum waste water collection systems. The manufacturer emphasized the need for pumps that are suitable for vacuum applications, have a high suction capacity and are resistant to solids. The customer opted for Börger rotary lobe pumps type PL 200. The customer is very satisfied with the Börger rotary lobe pump. In addition to the high reliability and suction capacity, the customer is particularly impressed by the low energy consumption of the Börger pump.

Technical data

A waste water treatment plant was looking for a stainless steel tank combination for a new technique of gas extraction from digested sludge. Here, a high level tank should surround an inner cylindrical pipe.

The operator of the waste water treatment plant decided in favor of a Börger stainless steel tank type 07.8. The customer was not also convinced by the high quality, but also by the possibility to choose the size as well as the material of the tank individually for each application.

The selected tank is 12 m high and consists of 8 stainless steel liner rings. The liner rings 1 – 6 are made from stainless steel 1.4301, because of the anaerobic fermentation of the area, which is covered with medium. Stainless steel 1.4571 has been selected for the two upper liner rings and the roof, as it is more resistant to chemical gases.

The Börger stainless steel high level tank has been mounted next to the cylindrical pipe, which has already been installed, and has then been lifted over it by crane. With this technique, much time and installation costs could have been saved, because of the better installation conditions.

Technical data

In 1999, in a Bavarian waste water treatment plant, the operator decided to use a Börger rotary lobe pump for digestion tower convection. After the Börger rotary lobe pump had operated 24 hours a day for two years without problems, the treatment plant operator was so impressed that he ordered and used more Börger pumps. The pump from 1999 has operated without problems since then. The other Börger rotary lobe pumps have not failed so far either. The rotors of the pump are equipped with replaceable lobe tips. Only the lobe tips have been replaced since 1999.

Technical data

A water treatment plant in Bahrain looked for four pumps for conveying permeate. The operator of the plant had only gained experience with centrifugal pumps in this area before. The operator was dissatisfied with the complicated and prone to failure pipeline construction which is necessary so that backflushing through the centrifugal pumps for cleaning the membranes can take place. The customer now uses four Börger rotary lobe pumps in membrane filtration. By changing the direction of rotation, the flow direction can be reversed. That way, the membranes can be cleaned by backflushing with filtered water without the need for a complicated pipeline system with several valves.

Technical data

A waste water treatment plant had persistent problems with a centrifugal pump which was used for pumping grease sludge. The submerged centrifugal pump pumped the sludge from the grease sludge basin into a storage shaft from which a second pump fed a digestion tower with the grease sludge. Higher TS contents caused problems to the centrifugal pump. The recurring blockages of the pump and the complex maintenance work resulting from them were the reason why the operator of the waste water treatment plant looked for an alternative pump technology.

Following intensive research, the customer decided to purchase a submerged Börger rotary lobe pump. Due to its ability to pump with stable pressure, the Börger rotary lobe pump can convey the viscous grease sludge from the grease sludge basin into the digestion tower directly. A storage shaft and a second pump are not necessary any more.

The customer is very satisfied with the new grease sludge pump. Since the customer has been using the Börger rotary lobe pump there have not been any failures caused by the pump even with high TS contents of the pumped medium.

Technical Data

One of the most advanced milk powder plants in Europe was looking for three tanks for their in-house process and waste water treatment. 600 million kg milk is processed in the plant every year.

The manufacturer opted for Börger stainless steel tanks due to the lasting value and long service life. The tanks in segmental design are installed within one week after the base plate has been finished. The tanks have been built in stainless steel 1.4301 and 1.4571 on customer request. The three stainless steel tanks are equipped with a GRP roof. The self-supporting cupola is accessible and offers the highest emission protection. The GRP roof can be installed gas-proof on request.

Technical data