Modelling solute transport in water disinfection systems: Effects of temperature gradient on the hydraulic and disinfection efficiency of serpentine chlorine contact tanks

Goodarzi, Danial; Abolfathi, Soroush; Borzooei, Sina

doi:10.1016/j.jwpe.2020.101411

Cited by 43 publications

(14 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chlorine decay is a reaction that also depends directly on temperature. Thus, the higher this parameter, the faster the FRC self-decay will occur (Li et al 2019;Goodarzi et al 2020). This observation was confirmed by Kim et al (2019), who found that the decay of FRC in supply water occurred more accelerated at 23 °C than at 18 °C.…”

Section: Resultsmentioning

confidence: 65%

“…Each test had a total duration of 1,440 minutes, with FRC determinations performed at times of 0, 10, 20, 40, 80, 160, 720 and 1,440 minutes. In parallel, the determinations of FRC were performed the monitoring of pH and temperature, in order to verify the variability of these parameters during the execution of the experiments, since these parameters are directly related to the degradation of FRC in water (Gallandat et al 2019;Li et al 2019;Goodarzi et al 2020).…”

Section: Experimental Conditions and Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of commercial disinfectants and an in loco-produced solution: free residual chlorine decay in human supply waters

et al. 2021

View full text Add to dashboard Cite

Disinfection process is used in the treatment of water for human supply to promote sanitary safety and provide users with drinking water that meets potability standards. Thus, it is necessary to sustain a minimal concentration of free residual chlorine (FRC) throughout the entire distribution system. The present study investigated the decay process of FRC concentration in water destined for human supply. The decay was evaluated in bench-scale testing, using sodium hypochlorite, calcium hypochlorite, sodium dichloroisocyanurate (organic chlorine) as disinfectant agents, and also an alternative disinfectant solution (ADS) produced in loco, with oxidizing and disinfectant properties, which is being used in Brazilian sanitation industry. To evaluate the decay, four models were fitted: first-order, nth-order, limited first-order and parallel first-order, hence determining the corresponding parameters which describe the decay speed of the FRC concentration in water. Achieved results demonstrated that all models were statistically significant and predictive. However, parallel first-order model produced the best fit. Regarding the evaluated disinfectants, it was noted the preeminence of ADS solution when compared to the others, since it imparted a higher FRC over time, a behavior indicated by lower values for reaction rate constant in all models and when compared to other disinfectants used in this study.

show abstract

Section: Resultsmentioning

confidence: 65%

Section: Experimental Conditions and Proceduresmentioning

confidence: 99%

Comparison of commercial disinfectants and an in loco-produced solution: free residual chlorine decay in human supply waters

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In turbidity currents, where complex phase-coupling (momentum exchange) between particles and fluid exists, velocity profiles determines the sediment deposition and the characteristics of flow hydrodynamic. A common method to evaluate the performance of numerical methods and computational codes is comparing the numerical results with physical modelling measurements 36,47,[68][69][70][71][72][73][74] . Comparison of vertical variations of the numerical velocity profiles with the experimental measurements of Farizan et al (2018) was conducted to validate the numerical model described in 61 .…”

Section: Model Verificationmentioning

confidence: 99%

Large eddy simulation of turbidity currents in a narrow channel with different obstacle configurations

Goodarzi

Lari

Khavasi

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

Turbidity currents are frequently observed in natural and man-made environments, with the potential of adversely impacting the performance and functionality of hydraulic structures through sedimentation and reduction in storage capacity and an increased erosion. Construction of obstacles upstream of hydraulic structures is a common method of tackling adverse effects of turbidity currents. This paper numerically investigates the impacts of obstacle’s height and geometrical shape on the settling of sediments and hydrodynamics of turbidity currents in a narrow channel. A robust numerical model based on LES method was developed and successfully validated against physical modelling measurements. This study modelled the effects of discretization of particles size distribution on sediment deposition and propagation in the channel. Two obstacles geometry including rectangle and triangle were studied with varying heights of 0.06, 0.10 and 0.15 m. The results show that increasing the obstacle height will reduce the magnitude of dense current velocity and sediment transport in narrow channels. It was also observed that the rectangular obstacles have more pronounced effects on obstructing the flow of turbidity current, leading to an increase in the sediment deposition and mitigating the impacts of turbidity currents.

show abstract

“…Demirel & Aral (2016) simulated mixing efficiency in multi-chamber contact tanks based on vorticity field in combination with both k À 1 and LES. On the other hand, several researchers only used k À 1 model to simulate residence time distribution in ozone contactors with different baffling configurations (Wols et al 2008;Demirel & Aral 2018b;Goodarzi et al 2020;Kizilaslan et al 2020).…”

Section: Introductionmentioning

confidence: 99%

The impact of turbulence models on the simulation of residence time distribution in a multichamber ozone contactor

Peng

Deng

et al. 2021

Water Supply

View full text Add to dashboard Cite

The flow and tracer transport in an ozone contactor is simulated by using computational fluid dynamics. The standard k- model, RNG k- model, Realizable k- model and SST k- model are used to describe turbulence. A step change method is used to simulate the residence time distribution. The residence time and cumulative residence time are compared with laboratory experiments. All turbulence models can capture the feature of the residence time distribution and cumulative residence time distribution. The residence time distribution in the initial period is sensitive to the used turbulence model, which can affect the value of MDI. The standard k- model behaves better among four turbulence models.

show abstract

Modelling solute transport in water disinfection systems: Effects of temperature gradient on the hydraulic and disinfection efficiency of serpentine chlorine contact tanks

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 43 publications

References 58 publications

Comparison of commercial disinfectants and an in loco-produced solution: free residual chlorine decay in human supply waters

Comparison of commercial disinfectants and an in loco-produced solution: free residual chlorine decay in human supply waters

Large eddy simulation of turbidity currents in a narrow channel with different obstacle configurations

The impact of turbulence models on the simulation of residence time distribution in a multichamber ozone contactor

Contact Info

Product

Resources

About