Qdos CWT pump addresses pipeline pressure challenge

Faced with chlorine degassing issues in its 80m pipe run, a French water purification plant deploys Qdos CWT chemical metering pumps to overcome this issue with an innovative operational concept.

Qdos CWT installed at Villejean water treatment works.

The Villejean water treatment plant near the City of Rennes in Brittany faced a structural challenge in adding sodium hypochlorite to a drinking water storage reservoir due to the unusually long length of the pipeline transporting the chlorine.

Watson-Marlow Fluid Technology Solutions (WMFTS), a manufacturer of peristaltic pumps for water treatment, has worked with most of the water treatment plants in the Collectivite Eau du Bassin Rennais, or Rennes Basin Water Authority, for several years. The authority manages the entire local water system from abstraction to tap, with responsibility for maintenance, monitoring and repair of 11 treatment plants.

These assets include a 5,000m3 drinking water storage reservoir, which serves around 500,000 people in the region, distributing an average of 25,000m3 of water through the network each day. This reservoir is fed by both the Villejean plant and the Rophemel plants, which are nearby, and the water requires chlorination at 0.3mg/litre.

The plant has already employed several Qdos pumps, each fitted with a ReNu pumphead optimised for sodium hypochlorite, sulphuric acid and hydrogen peroxide applications, with discharge pressures up to 4 bar.

The use of Qdos pumps for both sulphuric acid and hydrogen peroxide at the plant enabled “fast, simple and safe maintenance” compared with the diaphragm pumps deployed previously, WMFTS claimed. Furthermore, replacing ReNu pumpheads requires no tools, specific training or maintenance technician intervention, the company added.

The full article is available in the latest edition of Water & Wastewater Asia May/Jun 2022 issue. To continue reading, click here.