abstract
Wastewater samples from a Swedish chemi-thermo-mechanical pulp (CTMP)mill collected at different
purification stages in a wastewater treatment plant (WWTP) were analyzed with an amperometric enzyme-based biosensor array in a flow-injection system . In order to resolve the complex composition of
the wastewater, the array consists of several sensing elements which yield a multidimensional response.
We used principal component analysis (PCA) to decompose the array's responses, and found that wastewater with different degrees of pollution can be differentiated. With the help of partial least squares
Regression (PLS-R), we could link the sensor responses to the Microtox® toxicity parameter, as well as to
Global organic pollution parameters (COD ,BOD, and TOC). From investigating the influences of individual
Sensors in the array, it was found that the best models were in most cases obtained when all sensors in the array were included in the PLS-R model. We find that fast simultaneous determination of several
global environmental parameters characterizing wastewaters is possible with this kind of biosensor
array, in particular because of the link between the sensor responses and the biological effect onto the ecosystem into which the wastewater would be released. In conjunction with multivariate data analysis tools, there is strong potential to reduce the total time until a result is yielded from days to a few minutes.
abstractWastewater samples from a Swedish chemi-thermo-mechanical pulp (CTMP)mill collected at differentpurification stages in a wastewater treatment plant (WWTP) were analyzed with an amperometric enzyme-based biosensor array in a flow-injection system . In order to resolve the complex composition ofthe wastewater, the array consists of several sensing elements which yield a multidimensional response.We used principal component analysis (PCA) to decompose the array's responses, and found that wastewater with different degrees of pollution can be differentiated. With the help of partial least squaresRegression (PLS-R), we could link the sensor responses to the Microtox® toxicity parameter, as well as toGlobal organic pollution parameters (COD ,BOD, and TOC). From investigating the influences of individualSensors in the array, it was found that the best models were in most cases obtained when all sensors in the array were included in the PLS-R model. We find that fast simultaneous determination of several global environmental parameters characterizing wastewaters is possible with this kind of biosensorarray, in particular because of the link between the sensor responses and the biological effect onto the ecosystem into which the wastewater would be released. In conjunction with multivariate data analysis tools, there is strong potential to reduce the total time until a result is yielded from days to a few minutes.
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