AI Article Synopsis
- Membrane fouling is a major issue for reverse osmosis (RO) water systems, influenced by disinfection methods, which can leave behind bacteria that cause biofouling.
- The study compared five traditional disinfection methods (like UV and NaClO) and two novel ones (KFeO and FES) to see their effects on RO membrane fouling; results showed UV-DRB caused more fouling compared to the others.
- ATP levels were found to be a good indicator of biofouling potential, with thicker and denser biofilms linked to higher fouling, particularly from bacteria like Pseudomonas and Sphingomonas that produce more extracellular polymeric substances (EPS).
Article Abstract
Membrane fouling is the Achilles' heel of the reverse osmosis (RO) system for high-quality reclaimed water production. Previous studies have found that after the significant selection effect of traditional disinfection, the remaining disinfection-residual bacteria (DRB) may possess more severe biofouling potentials. To provide more constructive advice for the prevention of biofouling, we compared the RO membrane fouling characteristics of DRB after using five commonly used disinfection methods (NaClO, NHCl, ClO, UV, and O) and two novel disinfection methods (KFeO and the flow-through electrode system (FES)). Compared with the control group (undisinfected, 21.1 % flux drop), the UV-DRB biofilm aggravated biofouling of the RO membrane (23.4 % flux drop), while the FES, KFeO, and NHCl treatments showed less severe biofouling, with final flux drops of 6.9 %, 8.1 %, and 8.1 %, respectively. Adenosine triphosphate (ATP) was found to be a capable indicator for predicting the biofouling potential of DRB. Systematic analysis showed that the thickness and density of the DRB biofilms were most closely related to the different fouling degree of RO membranes. Moreover, the relative abundance of bacteria with higher extracellular polymeric substance (EPS) secretion levels, such as Pseudomonas and Sphingomonas, was found closely related with the biofouling degree of RO membranes.
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| http://dx.doi.org/10.1016/j.scitotenv.2022.157079 | DOI Listing |
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