Abstract
Recently, dynamic membrane bioreactor (DMBR) has gradually gained the interest of researchers for the development of membrane technology. In this paper, we set up parallel experiments to investigate the effect of powder activated carbon (PAC) on organic matter removal, transmembrane pressure, and filter cake layer characterization to make an overall performance assessment of DMBR. The results showed that DMBR has a good removal effect on organic matter removal, and with a chemical oxygen demand removal rate over 85%. Protein was found to be the main membrane fouling substance. Due to the electric double-layer effect, membrane fouling tended to be alleviated when the PN/PS value was low. Using a filtration model under constant current conditions, the filtration process through the cake layer was observed to be consistent with cake-intermediate model.
Highlights
Membrane bioreactor (MBR) has been widely used to treat various types of wastewater, include saline [1], municipal [2], industrial [3], dairy [4] and textile [5] wastewaters, due to its characteristic of thorough solid-liquid separation
In order to better evaluate the application of dynamic membrane bioreactor (DMBR) and allow an improved insight into the formation process of the cake layer, this study aims to (1) explain the formation and filtration performance of DMBR by supplementing it with powder activated carbon (PAC), (2) investigate the influence of PAC on the structure and stability of DMBR
The results indicate that the particles of the PAC-DMBR system are larger, and the microscopic examination results are consistent with our statement
Summary
Membrane bioreactor (MBR) has been widely used to treat various types of wastewater, include saline [1], municipal [2], industrial [3], dairy [4] and textile [5] wastewaters, due to its characteristic of thorough solid-liquid separation. To improve and render the property of DM layer to enhance wastewater treatment efficiency, in this study, we added PAC to the DMBR system in order to alleviate membrane fouling by increasing system porosity, improving permeability and enhancing system microbial activity, the reports on which are scarce. In order to better evaluate the application of DMBR and allow an improved insight into the formation process of the cake layer, this study aims to (1) explain the formation and filtration performance of DMBR by supplementing it with PAC, (2) investigate the influence of PAC on the structure and stability of DMBR filter layer and membrane fouling substances, and (3) explore the filtering mechanism of dynamic membrane filtration layers by means of mathematical models. This study may provide information to further increase the knowledge and provide guidance for the application of DMBR system
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