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Performances study of UV/O3-aMBR recirculation system in treating polluted surface water
Lu Li1, Kang Song1, C Visvanathan2
1Center for Water Environmental Engineering, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
Bioresource Technology
|July 19, 2018
Summary
This study enhanced wastewater treatment using an advanced UV/Ozone-assisted membrane bioreactor (aMBR) system. The innovative approach effectively removes non-biodegradable pollutants and reduces membrane fouling in surface water treatment.
Area of Science:
- Environmental Science
- Water Treatment Technologies
- Chemical Engineering
Background:
- Polluted surface water contains non-biodegradable organic matter that challenges conventional treatment.
- Advanced Oxidation Processes (AOPs) combined with membrane bioreactors (MBRs) show promise for enhanced removal.
- Recalcitrant compounds in MBR permeate require further treatment to improve biodegradability.
Purpose of the Study:
- To investigate the efficacy of a UV/Ozone-assisted membrane bioreactor (UV/O3-aMBR) system for treating polluted surface water.
- To evaluate the impact of varying recirculation ratios on treatment performance.
- To assess the system's ability to enhance biodegradability and reduce membrane fouling.
Main Methods:
- A UV/O3-aMBR system was employed, with UV/O3 applied to the recirculation stream of the aMBR.
- Polluted surface water with a Chemical Oxygen Demand (COD) of approximately 10 mg/L was treated.
- Recirculation ratios of 20%, 40%, 60%, and 80% were tested and compared.
Main Results:
- The UV/O3-aMBR system demonstrated increased removal of COD, UV254 absorbance, and ammonia nitrogen (NH3-N) with higher recirculation ratios.
- Significantly improved removal of recalcitrant organic matter and reduced membrane fouling were observed compared to the aMBR system alone.
- Fluorescent dissolved organic matter (FDOM) was substantially reduced, and system hydrophilicity increased.
Conclusions:
- The UV/O3-aMBR system is an effective technology for improving the removal of recalcitrant compounds in polluted surface water.
- The Modified Stover Kincannon model accurately described the UV/O3-aMBR system, indicating a higher maximum removal rate (Umax).
- This integrated approach offers enhanced biodegradability and superior overall treatment performance.
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