Chemistry: analytical and immunological testing – Nitrogen containing – Amine and quaternary ammonium
Reexamination Certificate
2005-04-19
2005-04-19
Gakh, Yelena G. (Department: 1743)
Chemistry: analytical and immunological testing
Nitrogen containing
Amine and quaternary ammonium
C436S125000, C436S055000, C436S164000
Reexamination Certificate
active
06881583
ABSTRACT:
A water chloramination control system compares the concentration of aqueous higher chloramines to aqueous ammonia to optimize the ratio of added ammonia to chlorine. Aqueous ammonia concentration is measured by conversion to monochloramine which concentration is determined spectroscopically. Higher chloramine concentration is measured by a reaction producing free iodine which concentration is also determined spectroscopically. The higher chloramine to ammonia ratio is used to control ammonia feed to the water. Problems associated with excess chlorine, or excess ammonia, are avoided.
REFERENCES:
patent: 6315950 (2001-11-01), Harp et al.
patent: 10028981 (1998-02-01), None
patent: WO 9735191 (1997-09-01), None
Cloramin.2 “Physical and Chemical Properties” http://www.epa.gov
cea/pdfs/drinkchapter2.pdf, Mar. 8, 1994.*
Valentine et al. “A spectrophotometric study of the formation of an unidentified monochloramine decomposition product”, Wate Research, 1986, v. 20, No. 8, pp. 1067-1074.*
Scott J. Kahle et al the use of Multiple Wavelength Ultraviolet-Visible Absorbance Spetrometry for on-Line Analysis of Wastewater Process Samples Undated.
Standard methods of Water and Waste Water Analysis 204 Edition p 4-78-4-79 & p 4-45-4-46.
Water Chloramination Process Control Nov. 1997.
Applied Spectrometry Associates Inc.
Gakh Yelena G.
Sainio Jeffrey W.
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