Chemical Dosing for Te Mihi Geothermal Station Cooling Towers: Update
- Key words
- Cooling water, microbiological control, algae, biocides, Sulphur Oxidising Bacteria, Te Mihi, cooling tower
- Conference
- New Zealand Geothermal Workshop
- Year
- 2022
- Session
- Session 3.3 - PRODUCTION & MANAGEMENT 2
- Language
- English
- Paper number
- 47
Full text
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Abstract
The chemical dosing for Te Mihi geothermal power station cooling tower water had previously been investigated and optimised. This involved continuous dosing of 30% caustic soda for pH control of the cooling water, with periodic shock doses of a quaternary ammonium bio-dispersant/biocide and
glutaraldehyde biocide for microbiological control. While initially successful, the caustic consumption and expenditure steadily increased over several years.
This work presents an updated review of the chemical dosing history at Te Mihi power station and performance-based improvement to the caustic chemical dosing system. The results of successful offline biocide dose trails on each cooling tower during a scheduled maintenance outage are also detailed.
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