Coesfeld waterworks
The Coesfeld waterworks is the central supply point for the treatment and provision of drinking water in the Coesfeld region . It belongs to the Stadtwerke Coesfeld GmbH and supplies a total of almost 80,000 people with water . The supply area includes the city of Coesfeld, the municipalities of Legden and Rosendahl and the district of Rorup in the city of Dülmen . The municipality of Nottuln has also been receiving supplies since 1992 . In addition, an emergency association with the city of Billerbeck has existed since 1994 with Gelsenwasser AG for mutual protection. Together, the Coesfeld and Lette waterworks treat around 3.2 million cubic meters of water a year. It is distributed via a pipeline network around 210 kilometers long - at peak times up to 14,000 cubic meters per day. On average, 1.6 million cubic meters of drinking water are treated each year in the Coesfeld water catchment area.
history
In 1907 the municipal waterworks on Coesfelder Berg went into operation. In 1939, the city combined the gas , water and electricity works into one company. This was the hour of birth of the “Stadtwerke Coesfeld i. W. ". In 1945 Allied bombs destroyed the administration building, the gas works, two transformer stations and most of the house connections for electricity and water. In 1950, electricity and water flowed smoothly again.
2009 - the new facility
The treatment technology of the old waterworks was no longer up to date after more than 50 years of continuous use. From autumn 2007 engineers, civil engineers and craftsmen built a completely new system. Stadtwerke Coesfeld have invested 6.1 million euros in the new waterworks. The modern Coesfeld waterworks went online on April 29, 2009. It is significantly more efficient than its predecessor: when fully utilized, it converts up to 550 cubic meters of raw water into crystal clear drinking water every hour. The new system creates 250 cubic meters more than the old system.
Water extraction
With the new system, Stadtwerke Coesfeld have renovated and expanded the water supply at the foot of the Coesfelder Berg. The wells of four of the five extraction wells as well as the pipes and cables to the waterworks are new . During the renovation, the engineers set the course for a sixth well . They checked the geological and hydrogeological conditions by drilling exploratory holes to a depth of 160 meters.
Water treatment plant
After a year and a half of construction, the new water treatment system was ready: 44 meters long, 17 meters wide and up to 12 meters high. Their barrel roofs and the aluminum facade stand out clearly. The building consists of more than 250 tons of steel and 2,200 cubic meters of concrete.
The new treatment plant softens the water. The raw water comes from a depth of up to 100 meters. It is very hard due to its high calcium content. This calcium content would put a heavy load on household appliances and cables over time. Two almost twelve meter high reactors help with the softening, the so-called rapid decarbonization. Quartz sand and lime milk are added to the raw water . The milk of lime lets the calcium precipitate as limestone . The limestone is deposited on the quartz sand. That in turn remains in the reactor. Cloudy substances in the water (with a degree of hardness of around 10 degrees German hardness) get stuck in four filter containers. The pH value of the water is lowered by adding carbon dioxide . The treated water is stored in two 350 cubic meter pure water tanks. Later the water is pumped into an elevated tank on the Coesfelder Berg. From there, the Coesfeld municipal utilities supply all households with water. The water has an even pressure of five to six bar.