Open Access
Open access
Water Science and Technology, volume 76, issue 3, pages 633-641

Estimation of water quality by UV/Vis spectrometry in the framework of treated wastewater reuse

Erwan Carré 1, 2
Jean Pérot 1
Vincent Jauzein 1
Liming Lin 2
Miguel Lopez-Ferber 2
1
 
SAUR, 1 rue Antoine Lavoisier, 78280 Guyancourt, France
2
 
Laboratoire du Génie de l'Environnement Industriel, Ecole des Mines d'Alès, 6 avenue de Clavières, 30319 Alès Cedex, France
Publication typeJournal Article
Publication date2017-04-22
scimago Q2
SJR0.554
CiteScore4.9
Impact factor2.5
ISSN02731223, 19969732
PubMed ID:  28759445
Environmental Engineering
Water Science and Technology
Abstract

The aim of this study is to investigate the potential of ultraviolet/visible (UV/Vis) spectrometry as a complementary method for routine monitoring of reclaimed water production. Robustness of the models and compliance of their sensitivity with current quality limits are investigated. The following indicators are studied: total suspended solids (TSS), turbidity, chemical oxygen demand (COD) and nitrate. Partial least squares regression (PLSR) is used to find linear correlations between absorbances and indicators of interest. Artificial samples are made by simulating a sludge leak on the wastewater treatment plant and added to the original dataset, then divided into calibration and prediction datasets. The models are built on the calibration set, and then tested on the prediction set. The best models are developed with: PLSR for COD (Rpred2 = 0.80), TSS (Rpred2 = 0.86) and turbidity (Rpred2 = 0.96), and with a simple linear regression from absorbance at 208 nm (Rpred2 = 0.95) for nitrate concentration. The input of artificial data significantly enhances the robustness of the models. The sensitivity of the UV/Vis spectrometry monitoring system developed is compatible with quality requirements of reclaimed water production processes.

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