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Principles and theoretical model of a membrane capacitive deionisation
Art der Abschlussarbeit
Master
Autoren
- Yoon, Sooyoung
Betreuer
- Prof. Dr. André Lerch
- M.Sc. Hanna Rosentreter
Abstract
Membrane Capacitive Deionisation (MCDI) is one of the electrochemical desalination tech-
nology for mostly brackish water treatment through changing a power source cyclically. By
applying an electrical potential as the power source of a system, salt ions are attracted to the
electrodes having an opposite polarity of the ions. At this time, the desalinated water can
be produced. For releasing the ions that temporarily stored in the electrodes, the reversed
polarity is simply applied to the system. Thereby, the ions are released, and the system can
be regenerated for the next cycle. One of the advantages of using MCDI system is related to
simple control. A user can expect a specic performance, such as Salt Retention rate and Water
Recovery. To do so, various variables should be determined such as current, voltage, duration,
and
ow rate. However, there is no standard way to design these operating settings. Therefore,
a theoretical model based on an empirical approach is developed for choosing an optimized
operating settings mode to predict the metrics for various desalination scenarios by this study.
The current value is the only dependent variable to be able to compare the model data with
experimental data performed by Herr (2018), Froehlich (2019), and Rosentreter. Voltage value
and
ow rate are independent variables, and these variables are xed according to the experi-
mental data, while duration is a control variable based on the experimental data. As a result,
the model data based on the empirical approach demonstrated desalinating the brackish water
2109mg=L consumed 0:49kWh=m3 for energy at Water Recovery 52% and Salt Retention rate
65 %. Furthermore, to reduce the energy consumption of MCDI system, the
ow rate variable
is recommended to adjust to a lower value.
nology for mostly brackish water treatment through changing a power source cyclically. By
applying an electrical potential as the power source of a system, salt ions are attracted to the
electrodes having an opposite polarity of the ions. At this time, the desalinated water can
be produced. For releasing the ions that temporarily stored in the electrodes, the reversed
polarity is simply applied to the system. Thereby, the ions are released, and the system can
be regenerated for the next cycle. One of the advantages of using MCDI system is related to
simple control. A user can expect a specic performance, such as Salt Retention rate and Water
Recovery. To do so, various variables should be determined such as current, voltage, duration,
and
ow rate. However, there is no standard way to design these operating settings. Therefore,
a theoretical model based on an empirical approach is developed for choosing an optimized
operating settings mode to predict the metrics for various desalination scenarios by this study.
The current value is the only dependent variable to be able to compare the model data with
experimental data performed by Herr (2018), Froehlich (2019), and Rosentreter. Voltage value
and
ow rate are independent variables, and these variables are xed according to the experi-
mental data, while duration is a control variable based on the experimental data. As a result,
the model data based on the empirical approach demonstrated desalinating the brackish water
2109mg=L consumed 0:49kWh=m3 for energy at Water Recovery 52% and Salt Retention rate
65 %. Furthermore, to reduce the energy consumption of MCDI system, the
ow rate variable
is recommended to adjust to a lower value.
Zugeordnete Forschungsschwerpunkte
- Membranverfahren der Trink- und Prozesswasseraufbereitung und Abwasserbehandlung
Schlagwörter
Membrane Capacitive Deionisation, brackish water, empirical approach, water recovery, salt retention rate, energy consumption
Berichtsjahr
2019