{"id":7283,"date":"2021-10-14T17:58:48","date_gmt":"2021-10-14T15:58:48","guid":{"rendered":"https:\/\/www.bio-uv.com\/etudes-de-cas\/drinking-water-treatment-by-ultraviolet-case-of-the-city-of-mulhouse\/"},"modified":"2025-09-16T12:28:47","modified_gmt":"2025-09-16T10:28:47","slug":"drinking-water-treatment-by-ultraviolet-case-of-the-city-of-mulhouse","status":"publish","type":"case_study","link":"https:\/\/www.bio-uv.com\/en\/case-studies\/drinking-water-treatment-by-ultraviolet-case-of-the-city-of-mulhouse\/","title":{"rendered":"Drinking water treatment by ultraviolet: case of the city of Mulhouse"},"content":{"rendered":"
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Challenge<\/h2>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n
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Depuis 2015, la ville de Mulhouse, en Alsace, a entam\u00e9 une d\u00e9marche visant \u00e0 mettre fin au traitement par chloration de son eau potable distribu\u00e9e dans 13 communes au profit d\u2019une solution plus \u00e9co-responsable et moins odorante : les ultraviolets<\/a>.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n

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After a conclusive test on a first well in 2016, BIO-UV Group has equipped all 8 of the city’s catchment wells with an ultraviolet water treatment system, marking the end of chlorination for the 200,000 consumers! Review and assessment of this installation which ensures a preventive treatment of drinking water.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n

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Mulhouse wants to guarantee water quality and stop chlorination<\/h2>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n
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\n \"municipal\n <\/figure>\n <\/div>\n\n
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Historically, Mulhouse’s water, coming from the Doller water table, did not require any treatment. However, the appearance of a small amount of bacterial pollution led the city to set up a systematic and continuous chlorination system. In 2016, anxious to offer quality water to its inhabitants, by improving its taste, optimizing the bactericidal efficiency while reducing the olfactory nuisances associated with chlorine, the city launched a call for tenders to find an alternative solution. A request that was part of the precautionary logic closely followed by the Regional Health Agency<\/a> and the Haut-Rhin Prefecture, which largely supported the project. She then decided to turn to ultraviolet treatment, a solution that is chemical-free, odorless and does not alter the taste of the water!<\/p>\n\n <\/div>\n <\/div>\n\n <\/div>\n <\/div>\n <\/section>\n

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Ultraviolet light, a more efficient and economical alternative to chlorine!<\/h2>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n
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Although it is one of the most widely used disinfectants in France, chlorine is likely to form undesirable by-products in the presence of organic matter, which can cause health risks (trihalomethanes and haloacetic acids for example). In addition, chlorine is not very effective on certain parasites such as Cryptosporidium oocysts.Associated with water treatment, ultraviolet light has an immediate bactericidal and virucidal action, i.e. it eradicates all bacteria and viruses present in the water by destroying their DNA. Ultraviolet radiation offers the advantage of acting directly on bacteria known as protozoa, where chlorine must be delivered in very large quantities to exterminate them.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n

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La d\u00e9sinfection UV garantit ainsi une qualit\u00e9 de l\u2019eau optimale permettant de r\u00e9pondre aux exigences les plus s\u00e9v\u00e8res en mati\u00e8re de traitement de l\u2019eau destin\u00e9e \u00e0 la consommation humaine<\/a>.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n

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“Ce traitement UV est pr\u00e9ventif et non chimique<\/em> ”<\/p>\n\n \n

Denis Parmentier, Director of the Water Department and Michelbach Dam Site Manager<\/cite><\/blockquote>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n
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Mulhouse chooses BIO-UV Group to treat its drinking water<\/h2>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n
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\n \"BIO-UV\n <\/figure>\n <\/div>\n\n
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Le syst\u00e8me de traitement des eaux par ultraviolets propos\u00e9 par BIO-UV Group, le syst\u00e8me DW<\/a>, a s\u00e9duit la ville de Mulhouse pour \u00e9quiper l\u2019ensemble des puits de captage de la ville.
\nLa gamme DW est agr\u00e9\u00e9e ACS UV et certifi\u00e9e \u00d6NORM. Associ\u00e9 \u00e0 un puit de captage, son principe est tr\u00e8s simple. En effet, l\u2019eau pomp\u00e9e est inject\u00e9e automatiquement dans le syst\u00e8me UV (un tube en acier qui renferme dix lampes UV \u00e0 quartz) avant d\u2019\u00eatre renvoy\u00e9e dans le r\u00e9seau de distribution.
\nLe traitement est pr\u00e9ventif car l\u2019eau brute est trait\u00e9e et d\u00e9sinfect\u00e9e en continu, que des bact\u00e9ries soient pr\u00e9sentes dans l\u2019eau ou non, \u00e0 la diff\u00e9rence d\u2019un traitement curatif mis en \u0153uvre uniquement en cas de probl\u00e8me de la qualit\u00e9 bact\u00e9riologique.<\/p>\n\n <\/div>\n <\/div>\n\n <\/div>\n <\/div>\n <\/section>\n

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Installation of UV treatment devices on all the catchment wells<\/h2>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n
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This study required significant work to equip the first underground well, which had little room to integrate the desired system. Taking into account these constraints, BIO-UV equipped this well with medium pressure lamps, more energy consuming but less cumbersome than low pressure lamps.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n

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“L\u2019\u00e9tude sur le premier puits s\u2019est av\u00e9r\u00e9e concluante. Par la suite, la ville a \u00e9tudi\u00e9 la construction de b\u00e2timents en surface de chaque puits, capables d\u2019accueillir des r\u00e9acteurs avec des lampes basses pression, dans un souci d\u2019\u00e9conomie d\u2019\u00e9nergie<\/em>”<\/p>\n\n \n

Alain NGuyen, technical sales engineer at BIO-UV Group<\/cite><\/blockquote>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n
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Following its success, eight wells were equipped in 2019 with devices with low pressure lamps, requiring two days of work. A beautiful project subject to the agreement of the Regional Health Agency and a hydrogeologist responsible for drafting the measures to be implemented during the work.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n

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A successful transition to UV for Mulhouse<\/h2>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n
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The BIO-UV facilities were commissioned in early 2019 with no observed operational, performance or treatment failures.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n

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The BIO-UV Group reactors are controlled by the flow rate of the production wells. The percentage of radiation as well as the status reports are directly transmitted to the city’s water department, ensuring the control of the reactors’ operation. Water quality monitoring is carried out by a company commissioned by the municipality. The city’s technical staff also performs a weekly visual inspection of all the sites to check for hydraulic leaks, vibrations or problems that cannot be detected remotely.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n

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Since then, the distributed water is no longer chlorinated at all. The chlorine dioxide system has been shut down. Nevertheless, to prevent any risk of bacterial contamination in the network, the chlorine injection stations have been kept in order to be active in case of pollution in the network in curative mode.\u00a0To date, the city of Mulhouse has not resorted to emergency treatment by chlorine injection.<\/strong><\/p>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n

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“Nos 8 puits et l\u2019ensemble du r\u00e9seau d\u2019eau de Mulhouse font l\u2019objet de toutes les attentions depuis leur cr\u00e9ation. Ce projet avait un degr\u00e9 de vigilance maximale, une planification et un suivi extr\u00eame pour atteindre la r\u00e9alisation de ce chantier<\/em>, souligne\u00a0Bernard Roche, Ing\u00e9nieur et Responsable du Bureau d\u2019\u00c9tudes Eaux et Travaux de la ville de Mulhouse.<\/strong> Nous sommes tr\u00e8s satisfaits de pouvoir proposer une eau de qualit\u00e9 et sans odeur aux habitants de notre ville. Les \u00e9quipes de BIO-UV Group se sont montr\u00e9es tr\u00e8s \u00e0 l\u2019\u00e9coute de nos besoins dans ce projet et nous ont accompagn\u00e9 jusqu\u2019au bout<\/em> ”<\/p>\n\n \n

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Pour BIO-UV Group<\/a>, le traitement des eaux par ultraviolets install\u00e9s \u00e0 Mulhouse est donc une solution de d\u00e9sinfection qui apporte un \u00e9quilibre entre \u00e9cologie, \u00e9conomie et pr\u00e9servation de l’environnement. Notre technologie a d\u00e9j\u00e0 \u00e9t\u00e9 mise en place dans de nombreuses villes pour \u00e9quiper les r\u00e9seaux d\u2019eau potable et ont d\u00e9j\u00e0 fait leurs preuves :\u00a0\u00e0 S\u00e8te en 2007<\/a>\u00a0ou \u00e0 Chamb\u00e9ry en 2018 pour ne citer que quelques exemples.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n

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\n \n You have a project? Contact us<\/span>\n <\/a>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n
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