Optimization and Control of Ozonation Plant Using Raw Water Characterization Method

Oh, Hyun Je; Kim, Weon Jae; Choi, June-Seok; Gee, Chai Sung; Hwang, Tae Mun; Kang, Jiwoo; Kang, Joon Wun

doi:10.1080/01919510390481702

Cited by 8 publications

(3 citation statements)

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“…The greater reduction in UV 254 values indicates that the high MW chromophores in the NOM were quickly broken down into low MW by-products with almost no UV absorbance, a finding in agreement with other authors (Matilainen and Sillanpää 2010). The increased degradation observed in the O 3 /UV process compared to ozonation and UV photolysis alone is probably a result of an increased formation in OH • (Oh et al 2003). This is in agreement with Lamsal et al (2011), who observed 31% TOC removal after treatment by O 3 /UV treatment under similar conditions (~ 1.4 mg O 3 /mg DOC, 1140 mJ/cm 2 ).…”

Section: Influence Of Uv Photolysis O 3 and O 3 /Uv On The Nom Contesupporting

confidence: 90%

Fate of bromine-containing disinfection by-products precursors during ozone and ultraviolet-based advanced oxidation processes

Petronijević

Agbaba

Ražić

et al. 2018

Int. J. Environ. Sci. Technol.

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This research evaluates the effect of ultraviolet photolysis, ozonation and ozonation/ultraviolet advanced oxidation processes on different disinfection by-product precursors, during the treatment of water with low organic matter and moderate bromide contents. After different combinations of ultraviolent fluence and ozone, the formation potentials of trihalomethanes and haloacetic acids were investigated. Bromine incorporation factors were used to give specific insight into the behaviour of brominated disinfection by-products, and inorganic bromate formation was also determined. The ozone/ultraviolet process was found to be more effective in reducing the total natural organic matter content than ozonation or ultraviolet photolysis alone. Ultraviolet photolysis was more successful removing the precursors of brominated trihalomethanes than chlorinated trihalomethanes, but slightly increased the precursors of both brominated and chlorinated haloacetic acids. During ozonation, reductions in the haloacetic acid formation potential were significantly better than those of the trihalomethanes formation potential (up to 54 and 27%, respectively). In the combined ozonation/ultraviolet process, increasing the ultraviolet fluence had a varying effect on trihalomethane and haloacetic acid precursor behaviour, depending on the ozone dose applied. Bromine incorporation after ozonation alone increased to up to 38% of the total bromide, largely as a result of bromate formation. The combined process curtailed all bromate formation, but increased the bromine incorporation up to 48% at higher ozone doses, with disinfection by-product formation shifting towards the more toxic brominated species.

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Section: Influence Of Uv Photolysis O 3 and O 3 /Uv On The Nom Contesupporting

confidence: 90%

Fate of bromine-containing disinfection by-products precursors during ozone and ultraviolet-based advanced oxidation processes

Petronijević

Agbaba

Ražić

et al. 2018

Int. J. Environ. Sci. Technol.

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“…Also, the rate of decomposition of ozone can be lowered by decreasing the pH of the solution (Hoigne andBader, 1976, 1985). These results with respect to the evolution of ozone have also been obtained by other authors (Persson Stubberud and Astrom, 1998;Oh et al, 2003).…”

Section: Influence Of Temperature On the Concentration Of Dissolved Osupporting

confidence: 89%

Ozonation of ibuprofen: A degradation and toxicity study

Quero-Pastor

Garrido-Pérez

Acevedo

et al. 2014

Science of The Total Environment

120

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“…13 As a result, some unwanted features, such as long time delay and nonlinearity 17 as well as multiple sources of disturbances and uncertainties, exist in the ozone dosage control system. 4,18 It is rather challenging to control the dissolved ozone residual constant under the unpredictable and always variable water quality and flow rate.…”

Section: Introductionmentioning

confidence: 99%

Optimized dosage control of the ozonation process in drinking water treatment

Niu

Wang

Chen

et al. 2021

Measurement and Control

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Ozonation is an important process in drinking water treatment. Determination of optimal ozonation dose is of significant importance for enhancing the quality of treated water and reducing the energy cost. It is known that keeping the dissolved ozone residual constant is an effective and reliable dosage control scheme. However, some external disturbances, such as large changes in raw water quality and water flow rate, always exist in the ozonation process. Meanwhile, the ozonation is a nonlinear process with large time constant and long time delay. Thus, it has been always a challenge for dosage control to maintain the dissolved ozone residual constant. The traditional control strategies such as PID and MPC merely utilize feedback regulation to suppress disturbances. This will degrade the control performance when strong disturbances occur. In this work, an effective control method integrating MPC method with disturbance observer (DO) is put forward to improve disturbance suppression performance. DO is utilized to estimate the disturbances and uncertainties, and then the estimated values are employed to conduct feed-forward compensation. The test results indicate that significant disturbance suppression improvements can be accomplished under the proposed method in comparison with the conventional MPC method in the ozonation process.

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Optimization and Control of Ozonation Plant Using Raw Water Characterization Method

Cited by 8 publications

References 0 publications

Fate of bromine-containing disinfection by-products precursors during ozone and ultraviolet-based advanced oxidation processes

Fate of bromine-containing disinfection by-products precursors during ozone and ultraviolet-based advanced oxidation processes

Ozonation of ibuprofen: A degradation and toxicity study

Optimized dosage control of the ozonation process in drinking water treatment

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