Simultaneous simulation of pathogen inactivation and bromate formation in full‐scale ozone contactors by computer software

Kim, Doo Il; Hasan, Sarah; Tang, George; Mariñas, Benito J.; Couillard, Lon; Shukairy, Hiba M.; Kim, Jae Hong

doi:10.1002/j.1551-8833.2007.tb08009.x

Cited by 8 publications

(22 citation statements)

References 19 publications

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“…When the hydrodynamic properties of the vertical upand-down flow ozone contactor were analyzed on a lab scale, the ozone contactors showed nonideal hydrodynamic properties (i.e., short-circuiting, recirculation and stagnant zone) and showed different hydrodynamic properties from ADR or CSTR (Kim et al 2010b). The nonideal flow properties of vertical flow ozone contactors are also shown in other researches at full scale (Kim et al 2006b). On the contrary, a horizontal meandering flow ozone contactor showed hydrodynamic properties close to the ADR model in a lab scale ozone contactor but has rarely been proved at full scale (Kim et al 2010a).…”

Section: Numerical Simulation With Adr Modelmentioning

confidence: 93%

“…In this study, a pseudo-first order Chick-Watson expression (i.e., without an initial lag phase) with a second-order inactivation rate constant, k N in L mg −1 min −1 , corresponding to the CT requirements in the LT2ESWTR (USEPA 2006), was used to represent the inactivation kinetics of C. parvum oocysts with ozone (Kim et al 2006b).…”

Section: Numerical Simulation With Adr Modelmentioning

confidence: 99%

“…Dissolved ozone, fast ozone demand, C. parvum oocyst log inactivation, and bromate formation are mathematically expressed by Equations [5], [6], [7], and [8] (Kim et al 2006b). Closed boundary conditions were used for their numerical solutions.…”

Section: Numerical Simulation With Adr Modelmentioning

confidence: 99%

“…Software adapting the ADR (Axial Dispersion Reactor) model successfully predicted the residual ozone concentration and C. parvum oocyst log inactivation (Kim et al 2006b). For ADR model simulation, it is necessary to obtain ozone decay kinetic constants such as fast ozone demand ([D] 0 ), the first-order ozone decay kinetic constant (k D ), and the secondorder constant for a decrease of ozone demand (k R ) from raw water entering an ozone contactor.…”

Section: Introductionmentioning

confidence: 98%

“…The advantage of using simulation software such as OCM is rapid and inexpensive prediction when the required key parameters are available (Kim 2006b). Furthermore, the capability to accurately predict CT, compared to conservatively overestimated CT via traditional methods, could facilitate low disinfection by-product formation through controlling the ozone dose (Kim et al 2004;Kim et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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Obtaining Real-Time Kinetic Parameters on Ozone Decay from a Full-Scale Ozone Contactor Using the Axial Dispersion Reactor Model

Kim

Cho

2014

Ozone: Science & Engineering

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Ozone decay kinetic parameters, including fast ozone demand ([D] 0 ), ozone decay rate constant (k D ), and rate constant for ozone reaction with ozone demand (k R ), are required for a numerical simulation targeting the design and operational optimization of an ozone contactor. The kinetic parameters of ozone decay and dispersion number were obtained from a full-scale ozone contactor for the axial dispersion reactor model simulation. The sensitivity analysis showed that the influence of k R was minor and the constant 13 L mg −1 min −1 for k R was suitable for carrying out simulations for sand-filtered raw water without measuring it. Curve fitting with on-site ozone concentrations and the ADR simulation results using a trial-and-error method could successfully provide kinetic parameters on ozone decay (i.e., k D and [D] 0 ). Using these real-time kinetic parameters, we successfully predicted the CT, residual ozone, C. parvum log inactivation, and bromate formation. Compared to a method based on the CSTR in series, this method could provide more accurate CT and residual ozone for an ozone contactor with horizontal meandering flow and low dispersion number.

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Section: Numerical Simulation With Adr Modelmentioning

confidence: 93%

Section: Numerical Simulation With Adr Modelmentioning

confidence: 99%

Section: Numerical Simulation With Adr Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Obtaining Real-Time Kinetic Parameters on Ozone Decay from a Full-Scale Ozone Contactor Using the Axial Dispersion Reactor Model

Kim

Cho

2014

Ozone: Science & Engineering

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Ozone‐contactor flow visualization and quantification using three‐dimensional laser‐induced fluorescence

Kim¹,

Nemlioğlu²,

Roberts³

et al. 2010

Journal AWWA

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Three‐dimensional laser‐induced fluorescence (3D LIF) was applied for the first time to investigate hydrodynamics and mixing in an ozone contactor used for water disinfection. The unsteady, three‐dimensional flow and mixing in the contactor was visualized and quantitatively analyzed, providing information that has not been possible to supply with traditional tracer techniques. In particular, the results obtained from a model reactor with a sidestream venturi injection suggested that the overall reactor hydrodynamics were close to a plug flow despite the jet injection at the inlet. The inflow separated into two streams as it reached the opposite wall, and the streams swirled as they traveled through the reactor, allowing a “plug‐flowlike” condition to develop in each water stream. The 3D LIF technique is expected to be useful for the design and optimization of ozone contactors and other disinfection reactors, including chlorine contactors and ultraviolet reactors.

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Using 3D LIF to investigate and improve performance of a multichamber ozone contactor

Kim¹,

Elovitz²,

Roberts³

et al. 2010

Journal AWWA

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Three‐dimensional laser‐induced fluorescence (3D LIF) was applied to visualize and quantitatively analyze hydrodynamics and mixing in a multichamber ozone contactor, the most widely used design for water disinfection. Results suggested that mixing was characterized by extensive short‐circuiting between chambers, internal recirculation within the chambers, and dead zones at the chamber centers. Because of these nonideal mixing behaviors, the hydrodynamics in the entire reactor showed greater dispersion than a series of completely mixed reactors. These flow patterns could be diminished by decreasing the channel width, whereas the effects of the flow rate and baffle gap were negligible within the range investigated. Accordingly, reactive transport model simulations suggested that overall reactor performance could be significantly improved by preventing these flow behaviors. The 3D LIF technique developed and presented in this study is expected to provide a novel tool for reactor diagnosis, retrofitting to improve performance, and new reactor design.

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Simultaneous simulation of pathogen inactivation and bromate formation in full‐scale ozone contactors by computer software

Cited by 8 publications

References 19 publications

Obtaining Real-Time Kinetic Parameters on Ozone Decay from a Full-Scale Ozone Contactor Using the Axial Dispersion Reactor Model

Obtaining Real-Time Kinetic Parameters on Ozone Decay from a Full-Scale Ozone Contactor Using the Axial Dispersion Reactor Model

Ozone‐contactor flow visualization and quantification using three‐dimensional laser‐induced fluorescence

Using 3D LIF to investigate and improve performance of a multichamber ozone contactor

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