Bubble Effects on Electrolysis for Water Purification in Microgravity

Date

7/10/2022

Journal Title

Journal ISSN

Volume Title

Publisher

51st International Conference on Environmental Systems

Abstract

The electrolysis under high pressure and high temperature is one of promising water purification processes of urine for future human space exploration missions. Fine gas bubbles are generated around the electrodes by electrolysis. It is considered that the buoyancy acting on the bubbles promotes departure from the electrode and transportation in electrolyte solution. In microgravity where buoyancy disappears, the bubble motion might be different from nominal gravity conditions and affect efficiency of oxidization of organic carbon including urine. In this paper, the behavior of gas bubble is modeled and the effect of gravity on electrolysis process for water purification of urine is estimated. The electrolysis voltage and current experimentally processed in microgravity are compared with the experiment on the terrestrial conditions and the stability and efficiency of electrolysis are discussed.

Description

Satoshi Matsumoto, Japan Aerospace Exploration Agency, JP
Nasa Yoshioka, Japan Aerospace Exploration Agency, JP
Hideki Saruwatari, Japan Aerospace Exploration Agency, JP
Yukitaka Matsumoto, Kurita Water Industries Ltd., JP
Kazuya Ishiwata, Kurita Water Industries Ltd., JP
ICES303: Physio-Chemical Life Support- Water Recovery & Management Systems- Technology and Process Development
The 51st International Conference on Environmental Systems was held in Saint Paul, Minnesota, US, on 10 July 2022 through 14 July 2022.

Keywords

Bubble motion, Physicochemical hydrodynamics, Two-phase flow, Water recovery

Citation