Water treatment using ozone and having a reduced likelihood of bromate formation from bromides found in the water
AssigneeBlack & Veatch Holding Company
InventorsRobert A. Hulsey, Jeffrey J. Neemann, Ronald E. Zegers, David J. Rexing
Life of this patent
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Abstract
A process and facility for treating and disinfecting water supplies comprising first treating the water with chlorine, then with ammonia, then with ozone to substantially disinfect the water, then passing the water through a filter with microorganisms to reduce the amount of small organic compounds and carbon in the water and finally again treating with chlorine so as to produce a residual level of chlorine in the water.
Claims41
In a process for treatment of water containing concentrations of bromides by ozone, the improvement comprising the step of:
- a) prior to treatment of said water by ozone, treating said water with chlorine, so as to reduce formation of bromates in the water;
- and
- b) treating said water with ozone.
A process for disinfecting fresh water supplies wherein the water initially contains bromides, including the steps of:
- a) injecting a quantity of chlorine into said water;
- and
- b) subsequent to injecting said chlorine, injecting a quantity of ozone into said water sufficient to substantially complete disinfection of said water such that said chlorine reduces the amount of ozone required to disinfect said water and thereby reduces conversion of said bromides to bromates by said ozone as compared to disinfecting without said chlorine.
A process for treating water so as to disinfect said water for human use comprising the steps of:
- a) treating said water with a first quantity of chlorine approximately sufficient in amount so as to meet chlorine demand without forming a substantial residual chlorine amount in the water;
- b) subsequent to step (a) adding ammonia to said water in an amount of at least 0.01 milligrams per liter;
- c) subsequent to step (b) adding ozone to said water in an amount approximately sufficient to disinfect said water to a selected degree;
- d) subsequent to step (c) passing said water through a filter having microorganisms thereon to reduce assimiable carbon, carboxylic acids and aldehydes to components that do not provide food for microorganisms;
- and
- e) subsequent to step (d) injecting a second quantity of free chlorine in said water so as to provide a residual level of chlorine of 0.1 milligrams per liter.
A water treatment facility for treatment of water containing bromides and adapted to reduce the formation of bromates comprising:
- a) a continuous flow water containing channel;
- b) a chlorine injection system adapted to inject chlorine into said water in said channel;
- and
- c) an ozone disinfection system adapted to inject ozone into said water subsequent to injection of said chlorine into said water;
- whereby bromate formation is reduced.
Dependencies are inferred from the claim text.