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.
A pilot-scale investigation of ozonation and advanced oxidation processes at Choa Chu Kang Waterworks
Jenny Wang, Achim Ried, Harald Stapel, Yaning Zhang, Minghui Chen, Wui Seng Ang, Rongjing Xie, Ankur Duarah, Lifeng Zhang, Mong Hoo Lim; A pilot-scale investigation of ozonation and advanced oxidation processes at Choa Chu Kang Waterworks. Water Practice and Technology 1 March 2015; 10 (1): 43–49. doi: https://doi.org/10.2166/wpt.2015.006
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