Characteristics of soluble microbial products and membrane fouling behavior in a pilot anaerobic membrane bioreactor for municipal wastewater treatment
The membrane fouling caused by soluble microbial products(SMP)is the main reason limiting the engineering application of anaerobic membrane bioreactor(AnMBR).Based on a large pilot-scale AnMBR for wastewater treatment,this study investigated the compositions and fluorescence characteristics of SMP,analyzed the SMP interception characteristics of the membrane and membrane foulants,and revealed the membrane fouling behaviors and characteristics of the fouling layer formed by different organic components of SMP.The results showed that the average concentration of SMP in AnMBR was(119.3±10.0)mg·L-1(based on dissolved organic carbon)during the stable operation stage.Most of the SMP were macromolecules with molecular weights higher than 100 000 Da(77.3±8.1)％.The compositions of SMP contained lignin and carboxyl-rich alicyclic molecules(45.2％),protein and amino sugars(26.1％)and lipids(14.0％).The membrane and membrane foulants exhibited a high SMP interception rate(83.7±5.4)％,of which the macromolecules interception rate reached 98.8％,while that the low and medium molecules interception rates ranged from 10％to 26％.Quartz crystal microbalance with dissipation monitoring indicated that macromolecules with high adsorption capacity at the membrane interface were the main components of SMP that caused membrane fouling.The fouling layer formed by low and medium molecules was dense,leading to a rapid decline in membrane flux and irreversible membrane fouling.This study revealed the characteristics and membrane fouling behaviors of SMP in AnMBR and provides a reference for the development of efficient membrane fouling control methods.
万方数据
维普
