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Analysis of Membrane Degassing of dissolved gases

Narayanam, Yagna Vardhan
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1703174704896849

Abstract Details

2023, MS, University of Cincinnati, Engineering and Applied Science: Chemical Engineering.
The use of Membrane technology is extensively increasing in wastewater treatment and several other industries, due to its versatility, effectiveness, high removal capacity, and ability to meet multiple treatment objectives. Mathematical models have been developed for the different types of flow module configurations to estimate the overall performance of the module. The models are designed to give the output parameters such as the overall mass transfer coefficient and concentration of ammonia in the outlet stream. The mass transfer coefficients of ammonia through the hollow fiber membrane are calculated to understand the transport of ammonia from the liquid side to the strip side. Among the several existing models, the calculation of the overall mass transfer coefficient in this model was done using the penetration model, in which the penetration of the liquids into the pores on both sides of the membrane is considered and the mass transfer coefficients through the wetted pores are calculated. This model also accounts for the change in several input parameters such as temperature, pH, etc. The objective of this study is to understand and optimize the performance of the module for the degassing of ammonia. The performance or efficiency of the module depends on the type of flow configuration it employs and the stripping mechanism it uses to remove the extracted ammonia. The aim of the study is to compare the performances of these different flow configurations and different stripping methods under similar conditions. The effects of several input parameters such as pH, temperature, initial concentration, length of the module, feed flowrate, on the overall mass transfer coefficients, and removal efficiencies are important to understand to find out the optimal conditions for the module to operate. The effect of adding a dense membrane over the porous membrane is also studied in this project. To study the impact of dense membranes on the overall mass transfer coefficient and removal efficiency, two different dense membranes have been considered and the required data has been taken from the literature. DuPont’s silicone rubber membrane and Cussler’s perfluorosulfonic acid membrane are two membranes considered to study the effect of dense membrane. The mass transfer coefficients of these dense membranes were added to the overall mass transfer coefficient calculation for every module. The deleterious effect of membrane fouling poses a major challenge associated with using porous and dense membranes to remove dissolved gases from water. Membrane fouling leads to a decrease in the removal efficiency of the membrane module and also has several effects on the module during the time of operation such as an increase in operating costs due to the higher pressures needed to maintain permeate flux, downtime needed for membrane cleaning and ultimate membrane replacement. The types of fouling and their mechanisms, along with the cleaning and prevention methods are discussed in this thesis. The deleterious effect of membrane fouling on the performance of the membrane is analysed for the different modules.
Rakesh Govind, Ph.D. (Committee Chair)
Stephen Thiel, Ph.D. (Committee Member)
Anastasios Angelopoulos, Ph.D. (Committee Member)
162 p.
Chemical Engineering
membrane; mass transfer; flow configuration; parameters; efficiency; flowrate

Recommended Citations

Citations

  • Narayanam, Y. V. (2023). Analysis of Membrane Degassing of dissolved gases [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1703174704896849

    APA Style (7th edition)

  • Narayanam, Yagna Vardhan. Analysis of Membrane Degassing of dissolved gases. 2023. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1703174704896849.

    MLA Style (8th edition)

  • Narayanam, Yagna Vardhan. "Analysis of Membrane Degassing of dissolved gases." Master's thesis, University of Cincinnati, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1703174704896849

    Chicago Manual of Style (17th edition)

ucin1703174704896849
81
© 2023, some rights reserved.Creative Commons License Analysis of Membrane Degassing of dissolved gases by Yagna Vardhan Narayanam is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.