Sodimate, Inc

Re-agent dosing - Sodimate installs standardised equipment to meet the specifications of each plant case study


Courtesy of Sodimate, Inc

Water quality refining is the most essential step in water treatment processes. When done properly, it guarantees palatable taste characteristics suitable for drinking water. The reliability and accuracy of the processes for storing, metering, and dissolving the required re-agents are indispensible for successfully completing this final treatment. Outlined below is a case story about Viry- Châtillon, a water treatment plant, where Sodimate installed a new powder activated carbon (PAC) dosing unit for Eau et Force, a subsidiary of Suez – Lyonnaise des Eaux.

Thanks to a 4500 km interconnected piping network, three towns in the South of Paris region, Morsang-sur-Seine, Vigneux-sur-Seine, and Viry- Châtillon, provide and supply up to 440 000 m3 of drinking water per day to approximately one million inhabitants

Built in 1931 and gradually expanded over several years, the plant in Viry-Châtillon can produces 120,000 m3 of drinking water each day from raw water taken from the River Seine and, to a lesser extent, underground water drawn from aquifers of the Albien and Sparnacien rivers. To produce a perfect water quality, the plant uses the most modern process. After finescreening, the water goes through ozone pre-oxidation before entering the settlement tanks. The water is then filtered through granular activated carbon to absorb the organic residue. An ozone treatment precedes a second filtration with PAC to process and neutralize micro-pollutants, thus improving the water quality. Finally, before proceeding to the final chlorination, the water’s calcium carbon ratio is adjusted to an adequate ratio.

Jean-Louis Le Hir is the Assistant Plant Manager at Viry- Châtillon, a privately owned facility. On the discussion of the management of the water treatment plant, he comments: 'Lyonnaise des Eaux is the owner, via their subsidiary Eau et Force, of all of the facilities at the three main South Ile-de-France plants; which is unusual in France. Eau du sud Parisien, another subsidiary, operates the works'. Eau du Sud Parisien is in charge of servicing and maintaining all equipment and treatment processes. Additionally, they ensure that the workers implement processes and organize the water treatment plant to ensure the proper sanitation of the water produced. However important sanitation monitoring may be, ensuring taste consistency receives the most attention, as Jean-Louis Le Hir points out, 'It is essential that the consumer should have water with the proper amount of nutrients and taste quality'. For this reason, the water treatment division of the plant in Viry- Châtillon includes a refining step on granular activated carbon located between the ozone preoxidation and the final disinfection. Injecting powdered PAC in the settling tanks improves water quality by eliminating the odorcausing compounds, pesticides and their by-products, algal toxins, chlorinated hydrocarbons, and trihalomethanes and other byproducts from the disinfection process. At Viry- Châtillon, the powdered activated carbon process is used periodically, 'Between seasons, the spring or autumn rains cause deterioration of the raw water quality. The addition of activated carbon and its porous structure allows the absorption of a wide range of compounds”, specified Jean-Louis Le Hir.

Since the middle of the 1960s, the plant in Viry- Châtillon used an activated carbon feeding system to deal with occasional deterioration of the raw water quality; however, the unit was outdated and no longer met current regulations. To upgrade this equipment, Eau du Sud Parisien contacted Sodimate to design and install a new activated carbon preparation and distribution unit. The objective was clear: design and install a new system taking into account the technical, safety, and environmental dimensions of the project. To do this, Sodimate chose to use the proper equipment to design a customised installation to meet the needs of their client.

Integrating Sodimate’s standard equipment to design a customised installation
Founded in 1980, Sodimate specialises in the design and installation of equipment for storing, dosing, dissolving, and mixing powdered re-agents. Over the last thirty years, whether it is drinking water, processed water or waste water, the company has acquired genuine expertise in handling dry reagents specifically for water and sludge treatment such as: hydrated lime, activated carbon, quicklime, microsand, etc. Their services range from providing reliable and efficient equipment, integrating designs, automation, In order to use only one type of activated carbon, slurry tank process was designed using load cells to, among other things, control accurately the percentage concentration of the solution. All the Each piece of equipment is automatically controlled and monitored. and technical assistance. Although the goal is often the same in designing plants, the characteristics vary from one project to another; hence, Sodimate offers custom designs and turnkey solutions to meet the customer’s needs.

For their client Eau du Sud Parisien, Sodimate was commissioned to replace the old 1960s PAC dosing and preparation plant in Viry-Châtillon. Three factors were considered while designing the new system, including: compatibility with the existing equipment, completion with the new ATEX regulations, and met the very precise specifications of Eau du Sud Parisien. 'The first difficulty consisted of removing all the old equipment,” explained Stéphane Zuddas, Project Manager for Eau du Sud Parisien. After much consideration, the choice was made to keep the old plant layout despite their particular configuration: two 70 m3 flat base concrete silos each with three levels: the highest, for storing carbon. The second and lower levels, about 20m² each, house the silo dischargers and feeding system and slurry mixing into the three settling tanks respectively.

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