Radisson, Dagua, DaguaFlo, DaguaFlo-UMF, drinking water, chemical free, ozone, membrane filtration Dagua offers a unique value proposition for local and international communities with large-scale drinking water treatment projects (from 5,000 to 500,000 m3/day). Delivering highly effective water purification and disinfection, Dagua’s ozone-membrane process occupies up to 40% less space than conventional coagulation systems. With coagulation eliminated from the treatment process, the DaguaFlo solution has a clear edge over the competition! To meet the needs of small- and medium-sized communities (500 to 5,000 m3/day), Dagua designs and manufactures prefabricated treatment plants that purify water to the most stringent quality standards. Available with or without housing, they are installed as a single unit between the source of the water to be treated and the distribution network. The plants are designed according to the specific parameters of a project and allow for an anticipated increase in water flow. Dagua also offers ozone generators for municipal and corporate applications such as the treatment of effluent, cleaning and the disinfection of industrial processes. Dagua's ozone generators represent an innovative solution for the replacement of chemical cleaners. Dagua also manufactures turnkey ozonation systems, with housing, measuring instruments and air and oxygen generation included. Our ultra-compact systems include a PLC for remote operation and monitoring. Drawing on years of R&D experience, Dagua has developed a patented process for the cleaning of ultrafiltration membranes using ozone microbubble technology. Ozone microbubbles are finely diluted in water to deeply clean capillaries and prevent membrane fouling. Dislodging accumulated solids without chemical cleansers, this process delivers significant cost savings. With this innovative technology, frequent downtimes for chemical cleanings are a thing of the past as well.

Case Study: Radisson Project



"The stability of the DaguaFlo system is a real asset for our community, especially since we can always count on Dagua’s exceptional service. The plant operator spends less than 60 minutes a day and the quality of the treated water exceeds government standards by as much as 11 times."


- Pierre Moses, Eng., Technical Services Manager, Baie-James Municipality



Case study: Radisson, a proven process


Radisson, Dagua, DaguaFlo, DaguaFlo-UMF, drinking water, chemical free, ozone, membrane filtrationIn March 2005, Radisson, a community of 500 people that is part of the Baie-James Municipality , commissioned its new drinking water treatment plant - the DaguaFlo-UMF.


This project became necessary in 2001 to ensure compliance with Quebec’s new Regulation Respecting the Quality of Drinking Water. It provided for achieving government standards in the treatment of surface water drawn from the Robert-Bourassa Reservoir.


The Radisson project involved establishing and implementing an innovative and chemical-free drinking water treatment process using ozone and membrane filtration, certified by the Quebec Drinking Water Treatment Technologies Committee. Partners in the project were Radisson and the Baie-James Municipality , as well as Canadian engineering firm SNC-Lavalin, one of the world’s leading engineering services organizations, and Dagua.


Claude Gagné, Director of Radisson at the time, underscored the project’s significance to the town’s citizens: “We are very satisfied with the outcome of this priority project which allows us to meet the new drinking water standards and solve the persistent problem of water discolouration, while benefiting from a new technology that requires little operating time.”


“SNC-Lavalin is pleased to be associated with innovative projects that can benefit communities like Radisson, given a global context where access to quality drinking water is a growing concern,” stated Éric Pinard, Engineer and Project Manager for SNC-Lavalin.



Technical specifications :

  • Technology: DaguaFlo-UMF (21 μm prefilter, ozone, membrane and microbiological filtration)
  • Design flow: 740 m3/day
  • Raw water source: Robert-Bourassa Reservoir
  • Automatic remote data acquisition by programmable logic controller (PLC) via the Internet
  • Main problems to correct: colour, pH, coliforms, organic matter

  • Operator profile: municipal mechanics


Performance indicators for the first 12 months of operation:

  • All 400 chemical analyses of the treated water indicated compliance with the Quebec Regulation Respecting the Quality of Drinking Water.
  • Plant availability was 99.61%.
  • Average time spent per day on plant operation: less than 30 minutes.


Graph 1 illustrates the turbidity of both the raw water and the water treated with the DaguaFlo-UMF process in Radisson. Data was collected at 4-hour intervals by the programmable logic controller (PLC) and uploaded via an Internet link.



Graph 1


Radisson, Dagua, DaguaFlo, DaguaFlo-UMF, drinking water, chemical free, ozone, membrane filtration




Graph 2 illustrates the trans-membrane pressure and demonstrates the absence of membrane fouling over an 11-month period.



Graph 2


Radisson, Dagua, DaguaFlo, DaguaFlo-UMF, drinking water, chemical free, ozone, membrane filtration



Conclusion: Over 18 consecutive months, the turbidity of the treated water registered an average result that was 11 times better than the government standard of 0.5 NTU, and never exceeded the regulatory limit.


These exceptional results demonstrate the system’s technical reliability, the minimal operator time required and above all, the superior quality of the treated water supplied to Radisson’s residents on an ongoing basis.



Radisson, Dagua, DaguaFlo, DaguaFlo-UMF, drinking water, chemical free, ozone, membrane filtration
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