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Prediction of gas holdup in the three-phase fluidized bed: air/Newtonian and non-Newtonian liquid systems

100%
Sivakumar V., Senthilkumar K., Kannadasan T.
Polish Journal of Chemical Technology
|
2010
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vol. 12
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issue 4
64-71
EN
The application of the three-phase fluidization technology in wastewater treatment and other biochemical processes has been regularly addressed in the past decades. For the design and development of the three-phase fluidized bed reactors, knowledge of the hydrodynamic parameter such as gas holdup is essential and hence in this paper an attempt has been made to study the effect of fundamental and operating variables on gas holdup. On the basis of the experimental results, a unified correlation has been developed to predict gas holdup in the fluidized bed using the Newtonian and the non-Newtonian liquids. The experimental results showed good agreement with those predicted according to the developed correlation.
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COD reduction studies of paper mill effluent using a batch recirculation electrochemical method

76%
Kannadasan T., Sivakumar V., Basha C., Parwate A., Senthilkumar K., Kannan K.
Polish Journal of Chemical Technology
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2011
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vol. 13
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issue 3
37-41
EN
The conventional method of treating pulp and paper mill effluent involves the biological oxidation by bacterial action of aerobic and anaerobic conditions and aerobic lagooning method, which are less efficiency of removing COD. To overcome the drawbacks of the existing treatment process, in the present work an attempt has been made to study the electro oxidative destruction of the pulp and paper mill effluent using an electrochemical method and the effect of various parameters such as concentration of supporting electrolytes, current densities, flow rates of electrolyte and reservoir volumes of the effluent were conducted. From the experimental results it is observed that the rate of reduction of COD of the effluent increased with an increase in the supporting electrolyte (sodium chloride) concentration, current density where as it decreased with increase in the reservoir volume and the flow rate of electrolyte. The residence time distributions studies have also been conducted to study the behavior of the electrochemical reactor.
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