Water Treatment Pumps
The constantly increasing demand on clean water and the water treatment associated with it is of global importance. In addition to the globally increasing demand on drinking water, other municipal and industrial processes are also dependent on efficient solutions for water supply and water treatment.
Pumps for wastewater treatment
Due to the ever more stringent requirements on water quality worldwide, most municipalities and industries now have their own wastewater treatment plants. Depending on the specific case, radial pumps and dosing pumps are often use for this purpose. However, other pump technologies are also possible in individual cases.
Processes of water treatment
Besides other water treatment processes, the dissolved air flotation (DAF) in wastewater engineering is most widely used, because it has proven itself as an economic and efficient process for municipal as well as industrial wastewater treatment.
The dissolved air flotation is a chemical/physical wastewater treatment process in which water is initially pressurized and saturated with gas or air. Next, the water is depressurized to atmospheric pressure again, which releases a corresponding gas or air content in the form of very fine bubbles. Together with the solids, these micro-bubbles form an agglomerate that rises to the surface of the flotation tank due to its very low density, where it can be removed mechanically.
Pump application examples for water treatment
· Industrial water treatment / plants
· Municipal water treatment / plants
· Flotation (incl. ozonization)
· Drinking water purification
· River water treatment
· Groundwater treatment
· Seawater desalination
· Chemical dosing
· Wastewater pump stations
Typical pumped media in water treatment
• Wastewater (with solids)
• Industrial water
• Sludge / sewage sludge
• River water
• Fresh water
• Drinking water
Successful application solutions
Grease and other pollutions have to be separated from mechanically pre-cleaned abattoir wastewater. Considerably improved flotation effect (bubbles image) and improved pump service life. Cleaning result considerably improved due to the improved bubble image. Moreover, a clearly more compact flotate. Decreased consumption of flocculants. Energy balance significantly improved. Retrofitting already paid off after six weeks.
In the paper industry, limy deposits from the circulation water in pipes, cooling systems, heat exchanger et cetera are prevented using lime traps. Considerably reduced freshwater consumption and a sustainable improvement of the process reliability. Repair costs and maintenance of the systems significantly reduced.
In this manufacturing process, pumps are required to feed and outlet the water as well as for water treatment.
Wastewater is pumped through long wastewater transport channels for processing in the sewage plat. 20 million cubic metre of wastewater per year flow into the sewage treatment plant, which corresponds to a connected load of 400,000 population equivalents. Existing standard pumps, pressure vessels and compressors successfully replaced by tow multiphase pumps.
During crude oil production, oil-water mixtures accrue to a considerable degree. With multiphase pumps equipped flotation systems separate oil and water. The oil obtained is further processed, and the water is returned back into the drill holes. Contrary to industrial applications, multiphase pumps are made in superduplex design for reasons of resistance.
Maritime bio-fouling is the main problem for materials which are in contact with seawater. Deposits of seawater organisms affect the function of drives and other facilities on board which require uniform cooling, thus affecting safety of the ships. By means of ozone, the quality of seawater for cooling the ship engines is improved, thereby avoiding considerable repair costs as well as ensuring smooth operation of the ocean-going vessels.
When processing regenerative energy sources such as biodiesel, timber, animal meal or calorific types of waste, the inert CO2 is leached out of the synthesis gas. Using a compressor, the gas is pressed into an absorption container where it flows upward through a packed bed. This filling is sprayed from above by a multi-phase pump. Water enriched with the CO2 from the synthesis gas and then widely degassed in a desorption container.