title: On-line concentration measurements in wastewater using nonlinear deconvolution and partial least squares of spectrophotometric data.
abstract: A procedure for the on-line measurement of concentrations of toxins in wastewater using spectrophotometric data is proposed. The complete absorbance spectrum of a wastewater sample is used to predict the concentrations of all possible substances within. Two techniques are examined. In nonlinear spectral deconvolution, the spectrum is decomposed as a linear combination of base spectra and the coefficients of this deconvolution are used to nonlinearly estimate the concentrations. Under partial least squares analysis, the concentrations are directly estimated as a linear combination of the measured spectrum data. Both techniques show good results for estimating the kinetics of samples taken during the reaction phase in a laboratory anaerobic/aerobic SBR used for p-nitrophenol biodegradation.
authors.affiliation: Environmental Bioprocesses Dept, Institute of Engineering, UNAM, Circuito Exterior s/n, Ciudad Universitaria, Coyoacán D.F., 04510 Mexico. avargasc@iingen.unam.mx
authors.forename: A
authors.initials: A
authors.lastname: Vargas
authors.forename: G
authors.initials: G
authors.lastname: Buitrón
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D016018:Least-Squares Analysis; D009596:Nitrophenols / Q000378:metabolism; D009862:Online Systems; D012722:Sewage / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D009596:Nitrophenols; D012722:Sewage; C024836:4-nitrophenol