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Fate of pharmaceuticals during membrane bioreactor treatment: Status and perspectives
Yanling Gu1, Jinhui Huang1, Guangming Zeng1
1College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China.
Abstract:
Pharmaceuticals in surface waters and wastewater treatment plants (WWTPs) as emerging pollutants have become a major concern. In comparison with other wastewater treatments, removal of pharmaceuticals in MBR has received much attention. This review presents the source and occurrence of pharmaceuticals in WWTPs influents. Experimental studies related to the removal of pharmaceuticals during MBR treatment, key affecting factors (including the different stages of MBR process configuration and the process parameters), and the underlying mechanisms proposed to explain the biodegradation and adsorption behaviors, have been comprehensively discussed. Several transformation products of pharmaceuticals are also reviewed in this paper. Furthermore, further research is needed to gain more information about the multiple influence factors of the pharmaceuticals elimination, appropriate methods for promoting pharmaceuticals elimination, more essential removal pathways, effect of pharmaceuticals on membrane fouling, and the detection and analysis of transformation products.
Insights
Pharmaceuticals in wastewater are a growing concern. Membrane bioreactors (MBRs) show promise for removing these emerging pollutants, but further research is needed to optimize their effectiveness.
Area of Science:
- Environmental Science
- Chemical Engineering
- Water Treatment Technology
Background:
- Pharmaceuticals are recognized as emerging pollutants in surface waters and wastewater treatment plants (WWTPs).
- Their presence poses a significant environmental and health concern.
- Membrane bioreactors (MBRs) are increasingly studied for their potential in pharmaceutical removal.
Purpose of the Study:
- To review the sources and occurrence of pharmaceuticals in WWTP influents.
- To comprehensively discuss pharmaceutical removal in MBRs, including influencing factors and mechanisms.
- To identify knowledge gaps and future research directions for pharmaceutical elimination in MBRs.
Main Methods:
- Literature review of experimental studies on pharmaceutical removal during MBR treatment.
- Analysis of key factors affecting removal, such as MBR configuration and process parameters.
- Discussion of proposed biodegradation and adsorption mechanisms.
- Review of pharmaceutical transformation products.
Main Results:
- MBRs are a focal point for research on pharmaceutical removal from wastewater.
- Various factors influence the efficiency of pharmaceutical elimination in MBRs.
- Biodegradation and adsorption are key mechanisms involved in pharmaceutical removal.
- Transformation products of pharmaceuticals are also generated and require consideration.
Conclusions:
- MBRs show potential for pharmaceutical removal, but optimization is needed.
- Further research should focus on multiple influence factors, enhanced removal methods, and essential removal pathways.
- Understanding the effects of pharmaceuticals on membrane fouling and improving the detection of transformation products are critical research areas.
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