Effects of Operational Conditions on Electrochemical Water Softening Using DSA Anode

DOI

10.2991/iceep-18.2018.215How to use a DOI?

Keywords

Dimensionally stable anode; Water softening; Current density; inter-electrode distance; Electrolysis

Abstract

Hardness forming ions such as Ca2+ and Mg2+ in cooling water tended towards scale on the surface of the heat exchanger, resulting in reduction of heat transfer efficiency. In this paper, by using DSA electrodes, effects of operational conditions on water softening was evaluated by Lab scale experiments. The experimental results shown that, when the current density increased from 50A/m2 to 250 A/m2, the removal rate of Ca2+ was improved from 14.0% to 46.3% with approximately logarithmic relationship. On the other hand, the removal rate of Ca2+ decreased from 71.63% to 14.91% among with the inter-electrode distance extended from 2cm to 10cm. After uninterrupted electrolysis of raw water for 8 minutes, the removal rate increased to 58.6%, and after the 8th minute, the uninterrupted electronic reaction couldn’t cause further removal of hardness forming ions. XRD and SEM shown that the crystal form of calcium carbonate on the cathode plate was mainly calcite. The research results provide important practical data for the research and design of this kind of water softening system.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Jiaoping Wang
AU  - Meina Shi
AU  - Gang Zhang
PY  - 2018/09
DA  - 2018/09
TI  - Effects of Operational Conditions on Electrochemical Water Softening Using DSA Anode
BT  - Proceedings of the 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018)
PB  - Atlantis Press
SP  - 1218
EP  - 1221
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceep-18.2018.215
DO  - 10.2991/iceep-18.2018.215
ID  - Wang2018/09
ER  -