Evaluation of Two-Stage Backwashing on Membrane Bioreactor Biofouling Using <i>cis</i>-2-Decenoic Acid and Sodium Hypochlorite
Biofouling in the membrane bioreactor (MBR) is a bottleneck in operation. This study explores the use of <i>cis</i>-2-decenoic acid (CDA) to mitigate biofouling. CDA is a signaling molecule known to disperse biofilms, which is reported to reduce the extracellular polymeric substances (EP...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/15/2/874 |
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| Summary: | Biofouling in the membrane bioreactor (MBR) is a bottleneck in operation. This study explores the use of <i>cis</i>-2-decenoic acid (CDA) to mitigate biofouling. CDA is a signaling molecule known to disperse biofilms, which is reported to reduce the extracellular polymeric substances (EPS) of biofilms and make them less chemically resistant. In our experiments, CDA 300 nM was used for the backwashing biofouling in MBR, and backwashing with CDA followed by 0 to 500 mg/L sodium hypochlorite (NaOCl) was also performed. The synergistic effect of CDA and NaOCl in alleviating biofouling was observed at CDA 300 nM and 100 mg/L NaOCl. However, controversial phenomena occurred under other conditions. An increase in biofilm removal efficiency with higher concentrations of NaOCl was not observed. Instead, the fouling rate increased at a 200 mg/L NaOCl condition compared to the control condition (i.e., DW washing). This phenomenon is hypothesized to result from the antagonistic interaction between the dispersion induction by CDA and the stress induced by NaOCl. This study specifically demonstrated the efficiency of two-stage backwashing with CDA and NaOCl in various aspects. The results of this study are expected to be utilized for optimizing MBR backwashing protocols. |
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| ISSN: | 2076-3417 |