Automatic total reducers monitoring and adjustment system using titration
First Claim
1. An apparatus for monitoring or adjusting, or both, the concentration of total reducer constituents in a water medium, said apparatus comprising:
- (a) a sample cell capable of containing a predetermined aliquot of a total reducers-containing water sample and predetermined amounts of chemical reagents and equipped with means of transmitting light of variable intensity through said sample cell and means for sensing light transmission through said cell from said means of transmitting;
(b) means for dispensing a predetermined aliquot of total reducers-containing water into said sample cell from a water medium;
(c) means for dispensing said reagents into the sample cell, said chemical reagents comprising a pH 5.0-5.5 buffer, optionally a methyl red indicator, optionally hydrochloric acid and a starch indicator;
(d) means for titrating an iodine solution into said sample cell at a predetermined rate of addition until said light transmission is not sensed by said light sensing means, whereupon titration stops;
(e) means for measuring and determining a time period from a starting of the iodine titrating to a subsequent time said light sensing means not sensing said light transmission, and(f) means for selectively translating said time period into a determination of total concentration of total reducer constituents in said water sample, into an amount of an oxidant chemical to be fed into said water medium, or into both, said translation means providing a first or second output signal, or both, said first output signal being sent to at least one monitoring means, and said second output signal being sent to at least one process adjustment means whereby the concentration of total reducer constituents in said water medium is adjusted.
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Accused Products
Abstract
A process and apparatus for automatically monitoring or adjusting, or both, the concentration of total reducers (i.e. reduced sulfur-containing constituents which consume iodine) in an aqueous medium (e.g. waste water stream) whereby the time period for iodine titration of an untreated sample of the aqueous medium is automatically measured by measuring a time of light being transmitted through a titration sample cell and this time measurement is automatically translated into an output signal to either a monitoring means or a process adjustment means (e.g. oxidant chemical feed pump) or both.
67 Citations
11 Claims
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1. An apparatus for monitoring or adjusting, or both, the concentration of total reducer constituents in a water medium, said apparatus comprising:
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(a) a sample cell capable of containing a predetermined aliquot of a total reducers-containing water sample and predetermined amounts of chemical reagents and equipped with means of transmitting light of variable intensity through said sample cell and means for sensing light transmission through said cell from said means of transmitting; (b) means for dispensing a predetermined aliquot of total reducers-containing water into said sample cell from a water medium; (c) means for dispensing said reagents into the sample cell, said chemical reagents comprising a pH 5.0-5.5 buffer, optionally a methyl red indicator, optionally hydrochloric acid and a starch indicator; (d) means for titrating an iodine solution into said sample cell at a predetermined rate of addition until said light transmission is not sensed by said light sensing means, whereupon titration stops; (e) means for measuring and determining a time period from a starting of the iodine titrating to a subsequent time said light sensing means not sensing said light transmission, and (f) means for selectively translating said time period into a determination of total concentration of total reducer constituents in said water sample, into an amount of an oxidant chemical to be fed into said water medium, or into both, said translation means providing a first or second output signal, or both, said first output signal being sent to at least one monitoring means, and said second output signal being sent to at least one process adjustment means whereby the concentration of total reducer constituents in said water medium is adjusted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification