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Title: Removal of silica from Raft River geothermal water

Abstract

Lack of sufficient quantities of clean surface or near-surface water at Raft River for cooling purposes dictates that cooled geothermal fluid, effluent from the Raft River 5 MW(e) Pilot Power Plant, must also be used as condenser coolant. Prior testing revealed that a water-treatment system would be required to reduce silica and calcium concentrations of the cooling fluid. The water-treatment system specified was to use dolomitic lime for both pH adjustment and source of magnesium. The dolomitic lime treatment was investigated and found to be inadequate. Subsequent testing was done to find chemical systems that would adequately reduce silica concentrations. Three magnesium and two iron compounds were found which reduced silica to acceptable concentration levels. They are magnesium bicarbonate, magnesium chloride, magnesium sulfate, iron sulfate, and iron chloride. Magnesium oxide, using a two-stage countercurrent process, will also reduce silica to adequate levels.

Authors:
;
Publication Date:
Research Org.:
Idaho National Engineering Lab., Idaho Falls (USA)
OSTI Identifier:
5195636
Report Number(s):
EGG-FM-5170
DOE Contract Number:  
AC07-76ID01570
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; GEOTHERMAL FLUIDS; WATER TREATMENT; GEOTHERMAL POWER PLANTS; COOLING; SILICA; REMOVAL; CALCIUM; COOLANTS; IRON CHLORIDES; IRON SULFATES; MAGNESIUM CARBONATES; MAGNESIUM CHLORIDES; MAGNESIUM OXIDES; MAGNESIUM SULFATES; PILOT PLANTS; POWER RANGE 1-10 MW; RAFT RIVER VALLEY; THERMAL WATERS; ALKALINE EARTH METAL COMPOUNDS; ALKALINE EARTH METALS; CARBON COMPOUNDS; CARBONATES; CHALCOGENIDES; CHLORIDES; CHLORINE COMPOUNDS; ELEMENTS; FLUIDS; FUNCTIONAL MODELS; HALIDES; HALOGEN COMPOUNDS; IDAHO; IRON COMPOUNDS; MAGNESIUM COMPOUNDS; METALS; MINERALS; NORTH AMERICA; OXIDES; OXYGEN COMPOUNDS; PACIFIC NORTHWEST REGION; POWER PLANTS; SILICON COMPOUNDS; SILICON OXIDES; SULFATES; SULFUR COMPOUNDS; THERMAL POWER PLANTS; TRANSITION ELEMENT COMPOUNDS; USA; Geothermal Legacy; 150802* - Geothermal Power Plants- Power Plant Systems & Components; 150600 - Geothermal Energy- Environmental Aspects

Citation Formats

Suciu, D F, and Miller, R L. Removal of silica from Raft River geothermal water. United States: N. p., 1980. Web. doi:10.2172/5195636.
Suciu, D F, & Miller, R L. Removal of silica from Raft River geothermal water. United States. https://doi.org/10.2172/5195636
Suciu, D F, and Miller, R L. Sun . "Removal of silica from Raft River geothermal water". United States. https://doi.org/10.2172/5195636. https://www.osti.gov/servlets/purl/5195636.
@article{osti_5195636,
title = {Removal of silica from Raft River geothermal water},
author = {Suciu, D F and Miller, R L},
abstractNote = {Lack of sufficient quantities of clean surface or near-surface water at Raft River for cooling purposes dictates that cooled geothermal fluid, effluent from the Raft River 5 MW(e) Pilot Power Plant, must also be used as condenser coolant. Prior testing revealed that a water-treatment system would be required to reduce silica and calcium concentrations of the cooling fluid. The water-treatment system specified was to use dolomitic lime for both pH adjustment and source of magnesium. The dolomitic lime treatment was investigated and found to be inadequate. Subsequent testing was done to find chemical systems that would adequately reduce silica concentrations. Three magnesium and two iron compounds were found which reduced silica to acceptable concentration levels. They are magnesium bicarbonate, magnesium chloride, magnesium sulfate, iron sulfate, and iron chloride. Magnesium oxide, using a two-stage countercurrent process, will also reduce silica to adequate levels.},
doi = {10.2172/5195636},
url = {https://www.osti.gov/biblio/5195636}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {6}
}