Determination of Water Treatment Parameters Based on Absorbance and Fluorescence

Abstract

A monitoring system configured to receive an on-line sample associated with a process includes a sample chamber positioned to receive the on-line sample and a detector positioned to selectively receive and detect multiple wavelengths of light transmitted through the sample during an absorbance measurement, and emitted by the sample during a fluorescence measurement in response to illumination by each of the at least one excitation wavelength. An optical fiber couples light transmitted through the sample and directs the transmitted light to the multi-channel detector during the absorbance measurement. Optics direct light emitted by the sample during the fluorescence measurement to the detector without passing through any optical fiber. A computer in communication with the detector is configured to correct the fluorescence measurement using the absorbance measurement and determine a sample parameter based on the fluorescence and absorbance measurements of the on-line sample.

Description

technical field [0001] The present disclosure relates to instruments for the indirect determination of parameters used in water treatment equipment, such as biological oxygen demand (BOD), chemical oxygen demand (COD), total organic carbon ( TOC), trihalomethane formation potential (THMFP), etc. Background technique [0002] Water treatment plants, including those treating surface water sources, are generally subject to various government requirements for the effluent distributed from the plant and for intermediate by-products that may be produced during treatment. In the United States, the Environmental Protection Agency (EPA) requires water treatment plants to use a coagulation process to reduce total organic carbon (TOC) concentrations before sanitizing finished water with halogenated / chlorinated disinfectants. [0003] Although various tools or instruments have been developed for monitoring TOC, on-line monitoring of TOC alone cannot provide the necessary information ab...

AI Technical Summary

Problems solved by technology

To provide accuracy and flexibility for a variety of applications, these instruments may include separate detectors for absorption and fluorescence measurements, where these detectors include correlations of multiple mirrors, beam splitters, lenses, and similar optical components. Composite optical path, which results in complex instrumentation with associated costs

Also, more complex optical arrangements may not be suitable for applications that require frequent disassembly and cleaning of components

Images