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https://hdl.handle.net/1822/9663
Título: | Quantitative monitoring of an activated sludge reactor using on-line UV-visible and near infrared spectroscopy |
Autor(es): | Sarraguça, M. C. Paulo, Ana M. S. Alves, M. M. Dias, A. M. A. Lopes, J. A. Ferreira, Eugénio C. |
Palavras-chave: | Activated sludge process UV-visible Near-infrared Chemometrics On-line monitoring Wastewater treatment |
Data: | Out-2009 |
Editora: | Springer Verlag |
Revista: | Analytical and Bioanalytical Chemistry |
Citação: | "Analytical and Bioanalytical Chemistry." ISSN 1618-2642. 395:4 (Out. 2009) 1159–1166. |
Resumo(s): | The performance of an activated sludge reactor can be significantly enhanced through use of continuous and real-time process-state monitoring, which avoids the need to sample for off-line analysis and to use chemicals. Despite the complexity associated with wastewater treatment systems, spectroscopic methods coupled with chemometric tools have been shown to be powerful tools for bioprocess monitoring and control. Once implemented and optimized, these methods are fast, nondestructive, user friendly, and most importantly, they can be implemented in situ, permitting rapid inference of the process state at any moment. In this work, UV-visible and NIR spectroscopy were used to monitor an activated sludge reactor using in situ immersion probes connected to the respective analyzers by optical fibers. During the monitoring period, disturbances to the biological system were induced to test the ability of each spectroscopic method to detect the changes in the system. Calibration models based on partial least squares (PLS) regression were developed for three key process parameters, namely chemical oxygen demand (COD), nitrate concentration (N-NO3−), and total suspended solids (TSS). For NIR, the best results were achieved for TSS, with a relative error of 14.1% and a correlation coefficient of 0.91. The UV-visible technique gave similar results for the three parameters: an error of ~25% and correlation coefficients of ~0.82 for COD and TSS and 0.87 for N-NO3−. The results obtained demonstrate that both techniques are suitable for consideration as alternative methods for monitoring and controlling wastewater treatment processes, presenting clear advantages when compared with the reference methods for wastewater treatment process qualification. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/9663 |
DOI: | 10.1007/s00216-009-3042-z |
ISSN: | 1618-2642 1618-2650 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Sarraguca_ABC2009[2].pdf | 274,8 kB | Adobe PDF | Ver/Abrir |