7 documents found, page 1 of 1
Exploiting near infrared spectroscopy as an analytical tool for on-line monitor...
Santos, J. R.; Lopo, M.; Rangel, António O. S. S.; Lopes, J. A.This work focused on the monitoring during the roasting process of one of the main characteristics of coffee's organoleptic profile: acidity. Batches of Arabica and Robusta coffee varieties from different origins were roasted following different process conditions. Simultaneously, real-time on-line monitoring of the coffee roasting process was performed with near infrared spectroscopy (NIRS) using a diffuse ref...
Caracterização de um solo salinizado em área irrigada da região Semiárida
Vital, A. F. M.; Santos, R. V.; Lopes, J. A.; Muraoka, T.A expansão das áreas irrigadas no semiárido acarreta sérios problemas de degradação dos solos, principalmente de salinização, reduzindo a capacidade produtiva das culturas. A compreensão de aspectos pedológicos é fundamental durante o manejo dessas áreas. Objetivou-se com esse trabalho a caracterização do solo de uma área irrigada visando a preservação da qualidade dos solos nos perímetros irrigados. Foi selec...
Quantitative monitoring of an activated sludge reactor using on-line UV-visible...
Sarraguça, M. C.; Paulo, Ana M. S.; Alves, M. M.; Dias, A. M. A.; Lopes, J. A.; Ferreira, Eugénio C.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 contro...
Activated sludge process monitoring through in situ near-infrared spectral anal...
Dias, A. M. A.; Moita, I.; Páscoa, R.; Alves, M. M.; Lopes, J. A.; Ferreira, Eugénio C.The application of near infrared (NIR) spectroscopy for industrial process monitoring is achieving increasing importance over the last twenty years. In fact, the real time monitoring capacity of NIR spectroscopy is a very important feature for process monitoring, prediction and control as it allows a fast evaluation of the state of the process. However, the application of NIR spectroscopy in wastewater treatmen...
Monitoring an activated sludge reactor using IR spectroscopy
Dias, A. M. A.; Paulo, Ana M. S.; Mesquita, D. P.; Alves, M. M.; Lopes, J. A.; Ferreira, Eugénio C.
Surveying an activated sludge reactor using online UV-visible and NIR spectrosc...
Paulo, Ana M. S.; Dias, A. M. A.; Sarraguça, M. C.; Lopes, J. A.; Alves, M. M.; Ferreira, Eugénio C.The performance of activated sludge reactors can be enhanced by the ability to monitor the status of the process without the need for chemicals addition or complex calibration procedures. Nowadays automation is still limited by poor sensor performance and high maintenance costs. Spectroscopic methods associated with chemometrics are being presented as a powerful tool for process monitoring and control. Once imp...
Activated sludge process monitoring through in-situ NIR spectral analysis
Dias, A. M. A.; Moita, I.; Páscoa, R.; Alves, M. M.; Lopes, J. A.; Ferreira, Eugénio C.The application of near infrared (NIR) spectroscopy for industrial process monitoring is achieving increasing importance over the last twenty years. In fact, the real time monitoring capacity of NIR spectroscopy is a very important feature for process monitoring, prediction and control as it allows a fast evaluation of the state of the process. However, the application of NIR spectroscopy in wastewater treatmen...