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

Changchun Xin; Jie Wang; Yang Zhang; Yuxiang Liu; Hui Jia; Lan Li

doi:10.1016/j.watres.2021.117153

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

Water Res. 2021 Jun 15:198:117153. doi: 10.1016/j.watres.2021.117153. Epub 2021 Apr 13.

Authors

Changchun Xin¹, Jie Wang², Yang Zhang³, Yuxiang Liu³, Hui Jia⁴, Lan Li⁵

Affiliations

¹ State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, P. R. China; School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, P. R. China.
² State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, P. R. China; School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, P. R. China. Electronic address: wangjiemailbox@163.com.
³ State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, P. R. China; School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, P. R. China.
⁴ State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, P. R. China; School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, P. R. China. Electronic address: ajiahui@163.com.
⁵ School of Textile Science and Engineering, Tiangong University, Tianjin 300387, P. R. China.

PMID: 33940502
DOI: 10.1016/j.watres.2021.117153

Abstract

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 α(254) were studied at different number of breakage fibers and filtration times. Moreover, we analyze the influence of Fe²⁺ and Ca²⁺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 α(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.

Keywords: UV-vis spectrum; absorption coefficient; differential absorbance spectra; membrane bioreactor; membrane integrity test.

MeSH terms

Bioreactors
Filtration
Ions
Water Purification*

Substances

Ions