hydrothermal water treatment
Along with hydrogen production in the electrolysis process, oxygen is produced as a by-product. Oxygen may be collected to provide an abundant source of low cost oxygen to clean waste water for re-use or for benign re-introduction to the environment. The oxygen may also be an additional revenue source. The Linde Company, a well-known provider of industrial gas, gives its customers guidance for utilizing industrial gases such as oxygen. Linde's paper "Enhanced Waste Water Treatment with Pure Oxygen"1 may serve as a good reference to use the liberated oxygen in the hydrogen fuel generation process.
1. Enhanced Waste Water Treatment with Pure Oxygen. Norcross: Linde Gas, 2009.