Modelling Chlorine Decay in Drinking Water Mains

Jivan, Nicolae; Robescu, Diana

doi:10.30638/eemj.2008.099

Cited by 7 publications

(7 citation statements)

References 7 publications

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“…(3) and (4) by writing a customized program using the FlexPDE code. The software is based on finite element method for numerically solving partial differential equations (PDEs) (Robescu et al 2008). Moreover, it has several features that make it applicable for different types of problems such as the ability to solve nonlinear PDEs of second order or less and eliminating the need for manually determining an appropriate mesh (the grid refinement automatically).…”

Section: Numerical Algorithmmentioning

confidence: 99%

Estimation of river Tigris dispersivities using a steady-state numerical model

Ismail

Muntasir

2018

Appl Water Sci

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The present work suggests a simple approach for simulating the dispersion of pollutants in rivers and streams with the aid of computational fluid dynamics technique. The two-dimensional advection-dispersion equation was solved using FlexPDE code to predict the biochemical oxygen demand (BOD) and the total dissolved solids (TDS) concentrations at the confluence of Diyala with Tigris Rivers. In this model, two sets of data were used for calibration and validation processes. Various values of longitudinal and transverse dispersion coefficients were adopted in the model to determine the suitable value using the trial-and-error method. The results revealed that the best agreement between simulated and measured values was observed when the longitudinal and transverse dispersion coefficients are close to 10 and 5 m 2 /s, respectively. The results showed that the proposed methodology is more suitable for TDS, while for BOD, it needs an accurate representation of the chemical or biological transformations.

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Section: Numerical Algorithmmentioning

confidence: 99%

Estimation of river Tigris dispersivities using a steady-state numerical model

Ismail

Muntasir

2018

Appl Water Sci

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“…Nitrifying bacteria were derived from the carbon and energy substrates when autotrophic and heterotrophic nitrifiers were present in the activated sludge [ 20 , 21 , 22 , 23 , 24 ]. Denitrifying bacteria require the presence of substrate BOD 5 and an adequate pH, temperature, nutrients, and redox potential [ 25 , 26 ]—the reason is that most denitrifying bacteria cannot ferment and use a molecule of carbonaceous biochemical oxygen demand (BOD 5 ) to degrade another molecule of BOD 5 as described in [ 27 , 28 , 29 , 30 ], whose level will be further established for our WWTP.…”

Section: Introductionmentioning

confidence: 99%

Biological Activated Sludge from Wastewater Treatment Plant before and during the COVID-19 Pandemic

Roman

Sava

Iluțiu-Varvara

et al. 2022

IJERPH

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The COVID-19 pandemic and the related measures brought a change in daily life that affected the characteristics of the municipal wastewater and further, of the biological activated sludge. The activated sludge process is the most widely used biological wastewater treatment process in developed areas. In this paper, we aim to show the situation of specific investigations concerning the variation of the physicochemical parameters and biological composition of the activated sludge from one conventional wastewater treatment plant from a metropolitan area. The investigations were carried out for three years: 2019, 2020 and 2021. The results showed the most representative taxa of microorganisms: Microtrix, Aspidisca cicada, Vorticella convallaria, Ciliata free of the unknown and Epistylis and Rotifers. Even if other microorganisms were found in the sludge flocs, their small presence did not influence in any way the quality of the activated sludge and of the wastewater treatment process. That is why we conclude that protozoa (especially Flagellates and Ciliates) and rotifers were the most important. Together with the values and variation of the physicochemical parameters, they indicated a good, healthy, and stable activated sludge, along with an efficient purifying treatment process, no matter the loading conditions.

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“…Disinfection of water is an important step in water treatment and is commonly employed as the last barrier in conventional water treatment processes for rendering water a potable quality [1]. Chlorination started to be used for water supply disinfection at the beginning of the 20th century, gradually spreading worldwide as evidence on statistics of reduction of waterborne epidemics from chlo-Journal of Water Resource and Protection rinated water supplies became more and more evident.…”

Section: Introductionmentioning

confidence: 99%

Variable Chlorine Decay Rate Modeling of the Matsapha Town Water Network Using EPANET Program

Tiruneh¹,

Debessai²,

Bwembya³

et al. 2019

JWARP

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A variable chlorine decay rate modeling of the Matsapha town water network was developed based on initial chlorine dosages. The model was adequately described by a second order rate function of the chlorine decay rate with respect to the initial chlorine dose applied. Simulations of chlorine residuals within the Matsapha water distribution network were run using the EPANET 2.0 program at different initial chlorine dosages and using the variable decay rate as described by the second order model. The measurement results indicated that the use of constant decay rate tended to underestimate chlorine residuals leading to potentially excess dosages with the associated chemical cost and side effects. The error between the two rate models varied between 0% and 15%. It is suggested that the use of water quality simulation programs such as EPANET be enhanced through the extension programs that accommodate variable rate modeling of chlorine residuals within distribution systems.

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Modelling Chlorine Decay in Drinking Water Mains

Cited by 7 publications

References 7 publications

Estimation of river Tigris dispersivities using a steady-state numerical model

Estimation of river Tigris dispersivities using a steady-state numerical model

Biological Activated Sludge from Wastewater Treatment Plant before and during the COVID-19 Pandemic

Variable Chlorine Decay Rate Modeling of the Matsapha Town Water Network Using EPANET Program

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