| Title | Challenges of Various Isothiazoline Applications as a Non-Oxidizing Biocide for Biofilm Prevention in Geothermal Cooling Systems |
|---|---|
| Authors | Nur Choiri Amin |
| Year | 2026 |
| Conference | World Geothermal Congress |
| Keywords | Bio-audit, Biofilm, Slime, Biocide, Slime Forming Bacteria, Biological Treatment, Isothiazoline, Biofilm Removal, Geothermal Cooling Water System |
| Abstract | The colonization of wetted surfaces by microbes in geothermal flash systems leads to biofilm formation. If not managed properly, this can result in fouling phenomena that negatively impact equipment performance, promote metal corrosion, accelerate wood deterioration, and reduce power plant efficiency. Effective control measures typically involve selecting appropriate biocides and implementing regular monitoring and maintenance protocols. This study evaluates the effectiveness of Isothiazoline as a biocidal agent for controlling and preventing biofilm in geothermal cooling water systems. Solenis conducted onsite biological audits across various geothermal operations in Indonesia to collect empirical data. Technical field data, microscopic examinations, and biological audit results indicated that Isothiazoline was ineffective in controlling biofilm buildup in the tested systems. In certain cases, its application led to increased chemical treatment costs exceeding USD 80,000 per year and a decrease in power plant output by more than 1%. These findings suggest that alternative biocide strategies should be explored to enhance system performance and improve cost-efficiency. |