Isco, Inc.

Bennett K Horenstein

Paul George Wright

David J Shannon

Lowell Robert Nickolaus

Clifford L McDonald, Jr

Randy J Forman

A hydrogen sulfide analyzer that continuously samples waste water from a waste stream or reservoir and measures the concentration of purgeable H.sub.2 S present (H.sub.2 SP) This information, when combined with the volume of water present, provides a control quality signal that regulates the feed rate of the destructor chemical into the waste stream. This results in chemical savings for the user. A second result is the reduction in odor complaints and the corrosion problems associated with H.sub.2 S emissions. The analyzer measures only the purgeable H.sub.2 S contained in the liquid sample. The analyzer violently agitates the sample containing dissolved H.sub.2 S in solution to simulate actual conditions at points of agitation in the waste water stream. It also provides nearly optimal partial pressure conditions for the H.sub.2 S to exit the solution as a free gas. Any H.sub.2 S that does not come out of solution in the analyzer is not of interest to the user since it will most likely not come out of solution in the treatment process either. The analyzer controls the feed of the destructor chemical based upon the measured quantity and concentration of H.sub.2 S that is likely to come out of solution in the collection/treatment process. It does not measure the total amount of sulfides present as other analyzers do. This is an important feature since it is wasteful to treat a condition that is not going to be a problem.

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Orinda, CA, United States of America

Bennett K Horenstein