Influence of inlet positions on the flow behavior inside a photoreactor using radiotracers and colored tracer investigations

Moreira, Rubens Martins; Pinto, Amenônia Maria Ferreira; Mesnier, Raphaël; Leclerc, Jean-Pierre

doi:10.1016/j.apradiso.2006.09.012

Cited by 17 publications

(9 citation statements)

References 17 publications

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“…However, the ASP involves several combinations of complex physical, biological and chemical processes [19], conventional RTD models as tank-in-series (TIS), axial dispersion model reported in the literature fail to provide a comprehensive view of the performance of ASP [20,21]. Compartment models are a combination of discrete reactors (CSTR and PFR) connected in a different configuration to provide a global approach to view of the hydrodynamic performance of the ASP and provide critical information for optimizing the plant operation [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and parametric study of an activated sludge process using residence time distribution technique

Sarkar

Sangal

Bhunia

2019

Environmental Engineering Research

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Hydrodynamic study of Activated Sludge Process (ASP) is important to optimize the reactor performance and detect anomalies in the system. Residence time distribution (RTD) study has been performed using LiCl as tracer on a pilot scale aeration tank (AT) and ASP, treating the pulp and paper mill effluent. The hydraulic performance and treatment efficiency of the AT and ASP at different operating parameters like residence time, recycle rate was investigated. Flow anomalies were identified and based on the experimental data empirical models was suggested to interpret the hydrodynamics of the reactors using compartment modelling technique. The analysis of the RTD curves and the compartment models indicated increase in back-mixing ratio as the mean hydraulic retention time (MHRT) of the tank was increased. Bypassing stream was observed at lower MHRT. The fraction of dead zone in the tank increased by approximate 20-25% with increase in recycle rate. The fraction of the stagnant zone was found well below 5% for all performed experiments, which was under experimental error. The substrate removal of 91% for Chemical oxygen demand and 96% for Biochemical oxygen demand were observed for the ASP working at a hydraulic mean residence time 39 h MRT with a 20% recycling of activated sludge.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamics and parametric study of an activated sludge process using residence time distribution technique

Sarkar

Sangal

Bhunia

2019

Environmental Engineering Research

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“…The flow behaviour is of paramount importance in a UV photoreactor. During a photoreaction process, dead zones must be avoided in the UV photoreactor since they result in inefficient use of the lamps' power, one of the largest components of the operating cost 5…”

Section: Introductionmentioning

confidence: 99%

“…Residence time distribution (RTD) using approaches other than electrical resistance tomography (ERT) in UV photoreactors and their hydrodynamic behaviour have been reported 5–8. Also, the effects of inlet position on the flow behaviour and hydrodynamics of continuous mixing tanks have been studied 9.…”

Section: Introductionmentioning

confidence: 99%

Mixing time in an agitated multi‐lamp cylindrical photoreactor using electrical resistance tomography

Zhao

Mehrvar

Ein‐Mozaffari

2008

J of Chemical Tech & Biotech

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“…This technology has been widely used in developed countries to help solve industrial problems [6][7][8][9]. It is also flourishing in developing countries [10][11][12][13][14][15] but facing a major constraint due to the unavailability of radiotracers at the time of requirement. For countries that do not possess radioisotope production facilities, it is necessary to import the radiotracers and long time involved in this process rules out the possibility of achieving potential benefit of this technology.…”

Section: Introductionmentioning

confidence: 99%

Investigation of liquid phase axial dispersion in Taylor bubble flow by radiotracer residence time distribution analysis

Chughtai

Iqbal

Din

et al. 2013

EPJ Web of Conferences

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Abstract. A gas-liquid Taylor bubble flow occurs in small diameter channels in which gas bubbles are separated by slugs of pure liquid. This type of flow regime is well suited for solid catalyzed gas-liquid reactors in which the reaction efficiency is a strong function of axial dispersion in the regions of pure liquid. This paper presents an experimental study of liquid phase axial dispersion in a Taylor bubble flow developed in a horizontal tube using high speed photography and radiotracer residence time distribution (RTD) analysis. A parametric dependence of axial dispersion on average volume fraction of gas phase was also investigated by varying the relative volumetric flow rates of the two phases.137m Ba produced from a 137 Cs/ 137m Ba radionuclide generator was used as radiotracer and measurements were made using the NaI(Tl) scintillation detectors. Validation of 137m Ba in the form of barium chloride as aqueous phase radiotracer was also carried out. Axial Dispersion Model (ADM) was used to simulate the hydrodynamics of the system and the results of the experiment are presented. It was observed that the system is characterized by very high values of Peclet Number (Pe∼10 2 ) which reveals an approaching plug type flow. The experimental and model estimated values of mean residence times were observed in agreement with each other.

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Influence of inlet positions on the flow behavior inside a photoreactor using radiotracers and colored tracer investigations

Cited by 17 publications

References 17 publications

Hydrodynamics and parametric study of an activated sludge process using residence time distribution technique

Hydrodynamics and parametric study of an activated sludge process using residence time distribution technique

Mixing time in an agitated multi‐lamp cylindrical photoreactor using electrical resistance tomography

Investigation of liquid phase axial dispersion in Taylor bubble flow by radiotracer residence time distribution analysis

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