Use of Spectra in the Visible and Near-Mid-Ultraviolet Range with Principal Component Analysis and Partial Least Squares Processing for Monitoring of Suspended Solids in Municipal Wastewater Treatment Plants

The present work assesses the possibility of using spectrophotometry in the near-mid-ultraviolet and visible wavelength ranges (282–790 nm) for the direct monitoring of treatment performance in municipal wastewater treatment plants (WWTPs). Principal component analysis (PCA) was used to analyze spec...

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Veröffentlicht in:Applied spectroscopy 2010-09, Vol.64 (9), p.1061-1067
Hauptverfasser: Lourenço, Nídia D., Paixão, Fátima, Pinheiro, Helena M., Sousa, Alexandra
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container_end_page 1067
container_issue 9
container_start_page 1061
container_title Applied spectroscopy
container_volume 64
creator Lourenço, Nídia D.
Paixão, Fátima
Pinheiro, Helena M.
Sousa, Alexandra
description The present work assesses the possibility of using spectrophotometry in the near-mid-ultraviolet and visible wavelength ranges (282–790 nm) for the direct monitoring of treatment performance in municipal wastewater treatment plants (WWTPs). Principal component analysis (PCA) was used to analyze spectral data from samples collected along three WWTP process lines with different primary and secondary treatment units. The clustering observed in PCA score plots was mainly attributed to the suspended solids fraction present in the wastewater and highlighted differences in solids quality between plants and along the treatment lines. Thus, satisfactory partial least squares (PLS) calibration models to estimate total suspended solids (TSS) values from the acquired spectra could only be established per plant. The PLS models were established using 1–2 factors, with root mean error of cross-validation and coefficient of determination values in the 50–86 mg TSS L−1 and 82–95% ranges, respectively.
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subjects Least-Squares Analysis
Principal Component Analysis
Sewage - chemistry
Spectroscopy, Near-Infrared - methods
Waste Disposal, Fluid - methods
Water Purification
title Use of Spectra in the Visible and Near-Mid-Ultraviolet Range with Principal Component Analysis and Partial Least Squares Processing for Monitoring of Suspended Solids in Municipal Wastewater Treatment Plants
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