Innovative Raman spectroscopy methods for enhancing wastewater treatment monitoring are introduced. Improved sensitivity in detecting low concentrations of analytes is demonstrated, addressing challenges like cross-sensitivity and turbidity. The findings highlight the potential for more accurate and robust inline monitoring in wastewater treatment plants, ensuring better water quality control.

Abstract

The aim of this study is to improve the inline monitoring of wastewater. Two probes, a resonator chamber constructed from aluminum and a 3D-printed hollow sphere crafted from steel with gold coating, are evaluated in comparison with a commercially available probe (Kaiser NCO10.5-VE). The impact on the sensitivity of the probes is illustrated in the Raman spectra. Furthermore, relevant analytes were measured in order to investigate the sensitivity in the ppm range. The effect on the Raman scattering with regard to the cross-sensitivity of the substances to each other and the turbidity of the sample was also investigated. With the help of simple and robust correction methods, the actual substance concentration of the respective analyte can be determined from a Raman measurement.