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Department of Water and Power City of Los Angeles

Department of Water and Power of the City of Los Angeles

Brian Nelson White

John H Morrow

Charles R Booth

A method for providing a dose of visible light in covered drinking water storage facilities to control nitrification. In one embodiment, the method includes irradiating the water with a dose of visible light sufficient to inhibit microbial nitrification of the water. In one embodiment, the dose of visible light has a wavelength from approximately 400 Hz to approximately 700 Hz. In another embodiment, the dose of visible light has a wavelength from approximately 550 Hz to approximately 700 Hz. In a further embodiment, the dose of visible light has a wavelength from approximately 380 Hz to approximately 430 Hz.

Photoinhibition of microbial nitrification in potable water

The optical properties of water impounded in reservoirs such as large tanks with closed covers and in uncovered reservoirs are monitored to detect harmful substances. The system and method comprises illuminating the water with an artificial light source within the enclosure for monitoring of the reservoir. Radiance and irradiance fluxes are measured by one or more multiband radiometers. Changes in radiance and irradiance are used to calculate spectral attenuation coefficients of the water. Fluorescence spectra are measured. A computer look-up table of known absorption and emission spectra is compared to the spectral attenuation to determine if a substance has been detected.

Detecting substances in drinking water reservoirs

An improved water quality monitoring system and method. The system utilizes reflectance radiometers to provide multiple wavelength measurement of downwelling irradiance and/or upwelling radiance. The method calculates attenuation coefficients from the downwelling irradiance or upwelling radiance to derive chlorophyll concentration in the water.

Growing community of inventors

Los Alamitos, CA, United States of America

Brian Nelson White