Removal of antibiotics pollutants in wastewater by UV-based advanced oxidation processes: Influence of water matrix components, processes optimization and application: A review

The reactive intermediate in Advanced Oxidation Processes (AOPs) is the •OH radical. It may be generated by various approaches such as the Fenton reaction (Fe2 + /H2O2), photo-Fenton reaction (Fe3 + /H2O2/hν), UV/H2O2, peroxone reaction (O3/H2O2), O3/UV, O3/activated carbon, O3/dissolved organic carbon (DOC) of water matrix, ionizing radiation, vacuum UV, and ultrasound. The underlying reactions and •OH formation efficiencies are discussed. The key reactions of •OH radicals also addressed in this review.

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A pilot-scale investigation of ozonation and advanced oxidation processes at Choa Chu Kang Waterworks

Water Practice & Technology ◽

10.2166/wpt.2015.006 ◽

2015 ◽

Vol 10 (1) ◽

pp. 43-49 ◽

Cited By ~ 1

Author(s):

Jenny Wang ◽

Achim Ried ◽

Harald Stapel ◽

Yaning Zhang ◽

Minghui Chen ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Organic Contaminants ◽

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Electrical Energy ◽

Pilot Scale ◽

Oxidation Processes ◽

Water Matrix ◽

Electrical Energy Per Order ◽

Efficient Option

A two-year comprehensive advanced oxidation processes (AOPs) pilot test was completed for a Singapore waterworks in 2011–2013. This study focused on oxidative removal of spiked organic contaminants with ozone and ozone-based AOPs (ozone application together with hydrogen peroxide, which is necessary for AOPs). The ‘optimized H2O2 dosage’ test philosophy was verified during the test period – keeping the residual ozone at 0.3 mg/L in the water for disinfection purpose by minimizing the H2O2 dosage. This study also monitored the bromate concentration in both ozone- and AOP-treated water, and all the samples reported below the laboratory detection limit (<5 µg/L), which is also lower than the WHO Guidelines for Drinking Water Quality (<10 µg/L). For comparison, a low pressure UV-based AOP test was conducted in the final stage of the study. The electrical energy per order (EEO) value is compared with ozone- and UV-based AOPs as well. The results indicated that ozone-based AOP with an optimized hydrogen peroxide dosage could be the most energy efficient option for this specific water matrix in terms of most selected compounds.

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Pilot scale testing of advanced oxidation processes for degradation of geosmin and MIB in recirculated aquaculture

Water Science & Technology Water Supply ◽

10.2166/ws.2010.246 ◽

2010 ◽

Vol 10 (2) ◽

pp. 217-225 ◽

Cited By ~ 10

Author(s):

M. M. Klausen ◽

O. Grønborg

Keyword(s):

Advanced Oxidation Processes ◽

Negative Impact ◽

Tap Water ◽

Advanced Oxidation ◽

Pilot Scale ◽

Oxidation Processes ◽

Water Matrix ◽

Degradation Rates ◽

Increased Risk ◽

The Impact

The presence of geosmin and 2-methylisoborneol (MIB) in recirculated aquaculture systems has a significant negative impact on the fish production due to poor flavour quality of produced fish and increased risk of rejection by fish processers. Advanced Oxidation Processes has a high potential for removal of geosmin and MIB in water and in this study UV/H2O2 and UV/O3 has been tested in pilot scale in real aquaculture process water. First order degradations constants were between 0.6 (UV/O3) and 1.2 (UV/H2O2) h−1 for geosmin and 1.3 (UV/O3)–1.5 (UV/H2O2) h−1 for MIB. This corresponded to average half-lives between 34–69 minutes for geosmin and between 28–32 minutes for MIB. These values were one order of magnitude higher than previously reported for degradation of geosmin and MIB in demineralised and tap-water. The slower degradation rates were caused by competitive and inhibitive processes from the water matrix. The influence of the water matrix also caused increased energy consumption with EEO values 16 to 38 times higher than previously reported for geosmin and MIB removal in tap water. Improved feasibility of removing geosmin and MIB in recirculated aquaculture systems by AOPs requires pre-treatment to minimize the impact of the water matrix on the degradation kinetics.

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