An Assessment of the Benefits Afforded by the Continuous Versus Intermittent Operation of Ozone for Drinking Water Treatment

Evans, Helen; Bauer, M. J.; Luckman, Ian; Page, Madeleine

doi:10.1080/01919510390481748

Cited by 2 publications

(1 citation statement)

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“…The generation of ozone is an energy and opex intensive process with an energy demand of ~ 3.3 -16 kWh / kg O3 (Jodzis and Zięba, 2018;Magara et al, 1995). The cost of the power required to generate ozone is between 50 -75% of the ozonation process cost (Evans et al, 2003) and around 15% of the total non-pumping energy requirement for a WTWs using ozone (Santana et al, 2014). Whilst ozone is usually delivered in the form of conventional millimeter sized bubbles, recent developments have allowed for the use of smaller bubbles known as microbubbles and nanobubbles.…”

Section: Introductionmentioning

confidence: 99%

Microbubbles and their application to ozonation in water treatment: A critical review exploring their benefit and future application

John

Brookes

Carra

et al. 2020

Critical Reviews in Environmental Science and Technology

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Ozonation is a widely applied water treatment process, used for oxidation of contaminants, as well as for the disinfection of water. However, the conventional ozonation process demands a high energy requirement and deep tanks to ensure effective mass transfer and oxidation.Microbubble technologies have emerged which have the potential to improve gas-liquid contacting. Microbubbles have diameters of 1-100 µm, while conventional bubbles used in ozonation are between 2 -6 mm. Microbubbles have many favorable characteristics that make them suitable for ozonation. In this review, the attributes of microbubbles for ozonation have been compared with those of conventional bubbles. The higher interfacial area and lower rise velocity of microbubbles compared with conventional bubbles means that ozone in the gas phase can be more efficiently transferred into the liquid phase. This is due to a higher contact time and increased contact area of the bubble with the bulk liquid. The analysis reveals that the volumetric mass transfer coefficient can be significantly enhanced through the use of microbubbles. In addition, the steady state dissolved ozone concentration was positively impacted by the use of microbubbles. Microbubbles were shown to be able to oxidize a broader range of organic compounds more quickly than for conventional bubbles. However, the review highlighted that comparison of microbubbles with conventional bubbles is not always carried

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