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This article discusses split treatment as an alternative method for water softening from the conventional method of reducing magnesium by adding lime. The article discusses two advantages provided by this treatment: the large lime excess present in the clear settled water from the primary stage is now completely used to remove only calcium hardness from the added secondary raw water; and, the final alkalinity of the settled secondary water is as low or lower than that provided in split recarbonation. The split‐treatment process is readily adaptable to simple, accurate automatic control, accomplished by the use of pH electrodes located just below the mixing point of the secondary raw water with settled water from the primary unit. It is possible, in some cases, to maintain this pH at the final pH of stability and eliminate any recarbonation of the settled water. The article presents the municipal water softening plant in Dayton, Ohio, as a unique opportunity to illustrate the results obtained by all three methods of softening.
This article discusses split treatment as an alternative method for water softening from the conventional method of reducing magnesium by adding lime. The article discusses two advantages provided by this treatment: the large lime excess present in the clear settled water from the primary stage is now completely used to remove only calcium hardness from the added secondary raw water; and, the final alkalinity of the settled secondary water is as low or lower than that provided in split recarbonation. The split‐treatment process is readily adaptable to simple, accurate automatic control, accomplished by the use of pH electrodes located just below the mixing point of the secondary raw water with settled water from the primary unit. It is possible, in some cases, to maintain this pH at the final pH of stability and eliminate any recarbonation of the settled water. The article presents the municipal water softening plant in Dayton, Ohio, as a unique opportunity to illustrate the results obtained by all three methods of softening.
Split‐Treatment Water Softening at Dayton
Black, A. P. (author)
Journal ‐ American Water Works Association ; 58 ; 97-106
1966-01-01
10 pages
Article (Journal)
Electronic Resource
English
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