Australian Centre for Water
and Environmental Biotechnology

Project Dates: 2013 to 2017


Hydrogen sulfide generation in sewer pipes is a notorious problem that costs wastewater utilities billions of dollars each year globally. Existing chemical dosing strategies for sulfide abatement in sewers are expensive and often come with safety issues. Caustic, oxygen and iron salts are commonly used by the water industry. This project develops two novel chemical-free electrochemical methods for sulfide control in sewers. First method relies on the simultaneous production of caustic and oxygen from sewage and the second method relies on the use of iron as a sacrificial electrode for the continuous generation of Fe3+ in sewage with concomitant hydroxide generation by the reduction of water. Biofilm responses to both dosing strategies are also investigated.