BCOR-MBR系统处理含盐废水过程中可溶性微生物代谢产物特性

Characteristics of soluble microbial products during BCOR-MBR treating brine wastewater

为研究生物接触氧化与膜生物反应器联合系统(BCOR-MBR)处理含盐废水过程中膜污染变化的原因,本文利用三维荧光技术解析不同盐度冲击下BCOR-MBR系统内微生物产物特性。通过研究发现,对照MBR(MBR-1)和组合系统MBR(MBR-2)上清液中SMP的三维荧光光谱中均主要有3个特征峰,当盐度从0 g·L^(-1)升高到3 g·L^(-1)时MBR-1中类腐殖酸物质A峰荧光强度从993.4升高到1 389,B峰荧光强度从879.4升高到1 312,而MBR-2在盐度提高到9~18 g·L^(-1)时,色氨酸特征峰荧光强度最高达到2 376,说明耦合了BCOR的MBR-2在某种程度上延缓了盐度的冲击;同时不同盐度环境下,MBR-2中三峰的荧光强度均弱于MBR-1,即耦合的BCOR可吸附部分复杂有机酸等大分子物质,从而降低了MBR-2的膜污染速度。

This research focused on the source of the membrane-fouling change in the combined system of a biological contact oxidation reactor and a membrane bioreactor （BCOR-MBR） treating brine wastewater.Fluorescence excitation emission matrix （EEM） spectroscopy was used to study the impact of the biological contact oxidation process on the characteristics of soluble microbial products under different salinity shocks in the BCOR-MBR system.There were three peaks in the EEM spectra of MBR-1 and MBR-2.The humic acid-like peak A in the EEM spectra of SMP in MBR-1 significantly increased from 993.4 to 1 389, and peak B increased from 879.4 to 1 312, when the salinity increased from 0 to 3 g·L-1.The fluorescence intensity of the tryptophan peak achieved its maximum value of 2 376 when the salinity reached 9 to 18 g·L-1.This result indicates that the impact of salinity shock could be delayed to some extent.Meanwhile, under different salinity conditions, the fluorescence intensity of the three peaks in MBR-2 was weaker than in MBR-1;thus, BCOR could remove part of the complex organic macromolecular material.Therefore, the membrane-fouling rate in MBR-2 decreased.