Liquid purification or separation – Processes – Chemical treatment
Patent
1992-11-06
1994-05-24
McCarthy, Neil
Liquid purification or separation
Processes
Chemical treatment
210757, 210202, 210206, C02F 176
Patent
active
053146298
ABSTRACT:
The present invention provides a new and improved method for treating drinking water in a drinking water treatment plant that provides for substantial or complete removal of chlorine dioxide and an associated by-product from water when chlorine dioxide is used as an initial disinfectant and/or chemical oxidizing agent. More particularly, the present invention provides a means for decreasing undesirable residual amounts of chlorine dioxide and chlorite ion using ferrous chloride. The novel process includes the addition of chlorine dioxide for disinfection/oxidation of the process water, a first sedimentation basin for processing the water and/or providing adequate chlorine dioxide contact time, the addition of ferrous chloride for treating the water and removing residual amounts of chlorine dioxide and chlorite ion, a source of chlorine (or alternative oxidizing agent) to precipitate residual ferrous iron, a second sedimentation basin, or similar settling mechanism, for processing the water after it has been mixed and reacted with the ferrous chloride and the oxidizing agent, and a filter for processing the water following the second sedimentation basin.
REFERENCES:
patent: 3915637 (1975-10-01), Taylor
patent: 3983033 (1976-09-01), Le Latour
patent: 4066748 (1978-01-01), Lietard et al.
patent: 4297333 (1981-10-01), Crawford et al.
patent: 4343706 (1982-08-01), Etzel et al.
patent: 4566986 (1986-01-01), Waldmann
patent: 4574036 (1986-03-01), Henriot
patent: 4693832 (1987-09-01), Kurst
patent: 4844800 (1989-07-01), Brucker
patent: 4983306 (1991-01-01), Deininger et al.
patent: 5011613 (1991-04-01), Feray et al.
patent: 5023012 (1991-06-01), Buchan et al.
"Pilot Plant Optimization of the Chlorine Dioxide Treatment Process For Disinfection By-Product Reduction"-Mark H. Griese, American Water Works Association Convention-Jun. 23-27, 1991.
"Controlling Disinfection By-Products with Alternative Disinfectants"-American Water Works Association Convention-Jun. 23-27, 1991.
"Using Reducing Agents to Eliminate Chlorine Dioxide and Chlorite Ion Residuals in Drinking Water"-Mark H. Griese et al.-Journal AWWA May 1991, pp. 56-61.
Bialosky Ronald S.
Griese Mark H.
Evansville Water & Sewer Utility
McCarthy Neil
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