Innovative reactor technology for selective oxidation of toxic organic pollutants in wastewater by ozone

2003 ◽  
Vol 47 (10) ◽  
pp. 17-24 ◽  
Author(s):  
M.A. Boncz ◽  
H. Bruning ◽  
W.H. Rulkens
Keyword(s):  
Energy Use ◽  
Oxidation Process ◽  
Flow Reactor ◽  
Plug Flow ◽  
Side Reactions ◽  
Efficient Design ◽  
Direct Oxidation ◽  
Efficient System ◽  
Tank Reactor ◽  
Oxidation Reactor

Ozonation can be a suitable technique for the pre-treatment of wastewater containing low concentrations of toxic or non-biodegradable compounds that cannot be treated with satisfactory results when only the traditional, less expensive biological techniques are applied. In this case, the oxidation process has to be made as efficient as possible, in order to reduce the costs of ozone addition and energy use. An efficient oxidation process with ozone can be obtained by focusing the oxidation with ozone selectively on the direct oxidation of toxic pollutants and to minimize ozone losses due to the decay of ozone in water. Supported by data of the rate constants of the reactions involved, a mathematical model was developed. It quantifies the ozone consumption by the process, and the share of ozone consumption by undesired side reactions, in several different reactor systems. Results obtained with this model indicate that a plug flow reactor (PFR) will be the most efficient design for the oxidation reactor. As an alternative, the cascaded tank reactor system (CTR), in which the ozone feed may be realized with less practical problems, might be considered. The traditional continuous flow stirred tank reactor (CFSTR) is shown to be the least efficient system.

Numerical Simulation of NO Conversion in the N2/O2/NO by Dielectric Barrier Discharge

2011 ◽  
Vol 84-85 ◽  
pp. 426-430 ◽  
Author(s):  
Shui E Yin
Keyword(s):  
Flue Gas ◽  
Flow Reactor ◽  
Plug Flow ◽  
Plug Flow Reactor ◽  
Flow Reactors ◽  
Dielectric Barrier ◽  
Chemical Reaction Kinetics ◽  
General Relations ◽  
Energy And Momentum ◽  
Oxidation Reactor

The SO2 and NOX from the coal-fired power station are the main gaseous pollutants in the air, which causes acid rain and photochemical smog. However, the two consequences are recognized as one of the most serious global environment problems and must be controlled. The electro-catalysts oxidation technology is capable of oxidized the NO which the wet flue gas desulfurization processes (WFGD) could not achieve this goal, the products from the electro-catalysts oxidation reactor entering the WFGD and to removal then removed simultaneously. In this work, a plug-flow reactors model is presented that can describe the conversion of NOx by the discharge treatment of the exhaust gases at low temperatures and at atmospheric pressure in dielectric barrier reactors. The model takes into account the behavior of a plug-flow reactor are simplified versions of the general relations for conservation of mass, energy, and momentum. The variation regularity of the generated nitrogen oxides, the main free radicals, and the rate of NO produce (ROP) were be analog by take the plug flow reactor (PFR) model of chemical reaction kinetics in the mixed flue gas of N2/NO/O2 , and trying to seek out the dominant reactions relation to production and consumption NO in the non-equilibrium plasma system. The results indicated that the dominant free radical is the O3 in the mixed flue gas of N2/NO/O2.

scholarly journals ANÁLISE FLUDODIMÂMICA DE UMA COLUNA DE FLOTAÇÃO POR MEIO DE DISTRIBUIÇÃO DE TEMPOS DE RESIDÊNCIA

2016 ◽  
Vol 4 ◽  
pp. 3
Author(s):  
Hudson Jean Bianquini Couto ◽  
Raphael Andrade Eloy Oliveira ◽  
Paulo Fernando Almeida Braga
Keyword(s):  
Flow Reactor ◽  
Plug Flow ◽  
Plug Flow Reactor ◽  
Stirred Tank ◽  
Continuous Stirred Tank Reactor ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Continuous Stirred Tank

Foi realizado um trabalho para avaliação da fluidodinâmica de uma coluna piloto de flotação, por meio da aplicação da técnica de distribuição de tempos de residência - DTR, em função das variáveis mais importantes do processo de flotação como velocidade superficial de alimentação, ar e água de lavagem, e da concentração de espumante. Foi ainda realizado um estudo comparativo entre as diferentes metodologias utilizadas para determinação dos parâmetros hidrodinâmicos de DTR, como ajuste dos modelos CSTR (Continuous Stirred-Tank Reactor) em série e PFR (Plug-Flow Reactor) de dispersão axial, aos dados experimentais.

Anaerobic digestion of solid substrates in an innovative two-phase plug-flow reactor (TPPFR) and a conventional single-phase continuously stirred-tank reactor

1998 ◽  
Vol 38 (8-9) ◽  
pp. 453-461 ◽  
Author(s):  
Tuanchi Liu
Keyword(s):  
Phase Separation ◽  
Single Phase ◽  
Flow Reactor ◽  
Plug Flow ◽  
Plug Flow Reactor ◽  
Stirred Tank ◽  
Two Phase ◽  
Tank Reactor ◽  
Solids Concentration ◽  
Continuously Stirred Tank Reactor

An innovative mesophilic continuous-feed anaerobic plug-flow reactor was employed to study system performance with solid feeds from 3% to 16% TS and hydraulic retention times from 32.0 to 13.1 days. The reactor performance under high-solid feeds (>10% TS) corresponding to phase separation along the longitudinal distance of the plug-flow reactor was discussed. The two-phase plug-flow reactor (TPPFR) always recovered from acidogenic conditions prevailing at the head end of the TPPFR, and the methanogenic phase was dominant within the remainder of the TPPFR. As the feed solids concentration increased to greater than 16% (loading capacity of the feed solids concentration) and as the acidogenic phase was extended, the methanogenic bacteria could not recover from the “sour” digestion as shown by the decreased gas/or methane production rate. With same feeds and under same operating conditions, the performance of the plug-flow reactor with phase separation is much better than that of the conventional single-phase continuously stirred-tank reactor (CSTR) in terms of efficiency and overall bioconversion.

A stochastic model for two-station hydraulics exhibiting transient impact

1997 ◽  
Vol 36 (5) ◽  
pp. 19-26 ◽  
Author(s):  
J. L. Jacobsen ◽  
H. Madsen ◽  
P. Harremoès
Keyword(s):  
Parameter Estimation ◽  
Flow Reactor ◽  
Deterministic Model ◽  
Plug Flow ◽  
Stochastic Methods ◽  
Sewer System ◽  
Statistical Tool ◽  
Water Level Variation ◽  
Deterministic Description ◽  
Linear Reservoir

The objective of the paper is to interpret data on water level variation in a river affected by overflow from a sewer system during rain. The simplest possible, hydraulic description is combined with stochastic methods for data analysis and model parameter estimation. This combination of deterministic and stochastic interpretation is called grey box modelling. As a deterministic description the linear reservoir approximation is used. A series of linear reservoirs in sufficient number will approximate a plug flow reactor. The choice of number is an empirical expression of the longitudinal dispersion in the river. This approximation is expected to be a sufficiently good approximation as a tool for the ultimate aim: the description of pollutant transport in the river. The grey box modelling involves a statistical tool for estimation of the parameters in the deterministic model. The advantage is that the parameters have physical meaning, as opposed to many other statistically estimated, empirical parameters. The identifiability of each parameter, the uncertainty of the parameter estimation and the overall uncertainty of the simulation are determined.

Efficient Production of Light Olefin Based on Methanol Dehydration: Simulation and Design Improvement

2020 ◽  
Vol 23 ◽  
Author(s):  
S. Majid Abdoli ◽  
Mahsa Kianinia
Keyword(s):  
Dimethyl Ether ◽  
Flow Reactor ◽  
New Technology ◽  
Plug Flow ◽  
Light Olefins ◽  
Efficient Production ◽  
Actual Process ◽  
Light Olefin ◽  
Aspen Hysys ◽  
Improved Design

Background: Ethylene, propylene, and butylene as light olefins are the most important intermediates in the petrochemical industry worldwide. Methanol to olefins (MTO) process is a new technology based on catalytic cracking to produce ethylene and propylene from methanol. Aims and Objective: This study aims to simulate the process of producing ethylene from methanol by using Aspen HYSYS software from the initial design to the improved design. Methods: Ethylene is produced in a two-step reaction. In an equilibrium reactor, the methanol is converted to dimethyl ether by an equilibrium reaction. The conversion of the produced dimethyl ether to ethylene is done in a conversion reactor. Changes have been made to improve the conditions and get closer to the actual process design done in the industry. The plug flow reactor has been replaced by the equilibrium reactor, and the distillation column was employed to separate the dimethyl ether produced from the reactor. Result and Conclusion: The effect of the various parameters on the ethylene production was investigated. Eventually, ethylene is

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