Application of UV-vis absorption spectrum to test the membrane integrity of Membrane bioreactor (MBR)

In this work, UV-vis absorption spectrum of the membrane integrity analysis based on slopes of log-transformed absorbance spectra, differential absorbance spectroscopy (DAS), and absorption coefficient alpha(254) were studied at different number of breakage fibers and filtration times. Moreover, we analyze the influence of Fe2+ and Ca(2+)concentration on UV spectrum detection results. Cluster analysis and the change ratio R-s were used to determine the dissolved organic matter (DOM) leakage stages. As a result, the correlation coefficient between slope(280-350) value and the number of breakage fibers is 0.901. Seven gaussian bands were successfully model from the DAS, and A4 (312 nm), A5 (339 nm), A6 (367 nm) were chosen to indicate the extent of breakage fiber. Peak 4(A4) is minimally affected by ions concentration. The alpha(254) could be used as a good indicator for detecting industrial wastewater treatment process which correlation coefficient between the number of breakage fibers is 0.955. The DOM leakage process was divided into three stages which were bulk leakage stage, development stage and stabilization stage. The UV-vis absorption spectrum can effectively detect the membrane integrity more sensitive than particle counter and three analyse methods are suitable for different substance in feed water. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The study investigated membrane integrity using various spectral analysis methods, including DAS and absorption coefficient; results showed different factors impact UV spectrum detection, with high correlation between slope and number of breakage fibers; analysis revealed DOM leakage process can be divided into different stages.