Quantitative near-surface remote sensing of wastewater quality in oxidation ponds and reservoirs: a case study of the Naan system

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Abstract:

This study develops a remote sensing technique for real-time monitoring of wastewater effluents stored before irrigation. Reflectance and attenuation coefficients for downwelling irradiance spectra (400 to 950 nm spectral resolution of 2 nm) were acquired simultaneously with turbidity, chlorophyll, organic matter, and total suspended matter concentrations in the Naan wastewater system, Israel. High-spectral-resolution spectrometric data were used to select the most suitable spectral bands for remote sensing of "optically active" constituent concentrations. Algorithms for remote estimation of wastewater quality expressed as chlorophyll-a, bacteriochlorophyll-a, and total suspended matter concentrations were developed. Reflectance height at 720 nm and an area above the base line from 670 to 950 nm was used in algorithms for chlorophyll-a assessment (r 2 > 0.83). For bacteriochlorophyll-a assessment, an area under the base line through 780 to 900 nm was used, allowing its quantitative estimation (r 2 > 0.94). Reflectance of approximately 570 and from 400 to 950 nm correlated closely with total suspended matter concentration (r 2 > 0.82) and was used to retrieve it from reflectance spectra. This is the first reported study on the quantitative remote assessment of wastewater quality. The results suggest that four spectral bands be used for real-time monitoring of wastewater ponds quality.

Keywords: BACTERIOCHLOROPHYLL; CHLOROPHYLL; PHYTOPLANKTON; REFLECTANCE; REMOTE SENSING; SUSPENDED SOLIDS; WASTEWATER

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143097X126028

Publication date: November 1, 1997

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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