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Water 2013, 5(4), 2026-2036; doi:10.3390/w5042026

Monitoring Urban Wastewaters’ Characteristics by Visible and Short Wave Near-Infrared Spectroscopy

Department of Agrochemistry and Environment, University Miguel Hernández, Av Universidad s/n Edificio Alcudia, Elche 03202, Spain
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Received: 8 October 2013 / Revised: 28 November 2013 / Accepted: 4 December 2013 / Published: 6 December 2013
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Abstract

On-line monitoring of wastewater parameters is a major scientific and technical challenge because of the great variability of wastewater characteristics and the extreme physical-chemical conditions that endure the sensors. Wastewater treatment plant managers require fast and reliable information about the input sewage and the operation of the different treatment stages. There is a great need for the development of sensors for the continuous monitoring of wastewater parameters. In this sense, several optical systems have been evaluated. This article presents an experimental laboratory-based approach to quantify commonly employed urban wastewater parameters, namely biochemical oxygen demand in five days (BOD5), chemical oxygen demand (COD), total suspended solids (TSS), and the ratio BOD5:COD, with a visible and short wave near infrared (V/SW-NIR) spectrometer (400–1000 nm). Partial least square regression (PLSR) models were developed in order to quantify the wastewater parameters with the recorded spectra. PLSR models were developed for the full spectral range and also for the visible and near infrared spectral ranges separately. Good PLSR models were obtained with the visible spectral range for BOD5 (RER = 9.64), COD (RER = 10.88), and with the full spectral range for the TSS (RER = 9.67). The results of this study show that V/SW-NIR spectroscopy is a suitable technique for on-line monitoring of wastewater parameters. View Full-Text
Keywords: wastewater; spectroscopy; biochemical oxygen demand; chemical oxygen demand; total suspended solids wastewater; spectroscopy; biochemical oxygen demand; chemical oxygen demand; total suspended solids
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Melendez-Pastor, I.; Almendro-Candel, M.B.; Navarro-Pedreño, J.; Gómez, I.; Lillo, M.G.; Hernández, E.I. Monitoring Urban Wastewaters’ Characteristics by Visible and Short Wave Near-Infrared Spectroscopy. Water 2013, 5, 2026-2036.

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