Table 1 Examples of methods of monitoring silica scale formation in the literature on scale prevention or control.
From: Fiber Optic Sensor for Real-Time Sensing of Silica Scale Formation in Geothermal Water
Monitoring methods | Situation | Scale | Scale inhibitor or controller | Measurement period | Reference |
|---|---|---|---|---|---|
Weighing the scale collected in spools | Laboratory and geothermal field | Silica | Mixed chemical inhibitor | 48 h | |
Measurement of monomeric silica in water by molybdate colorimetry | Laboratory | Aluminum silicate | pH modification Chelating reagent | 4 h | |
Weighing the scale collected in spools | Laboratory and geothermal field | Aluminum silicate | Chelating reagent | 48 h | |
Monitoring the flow rate through a column packed with alumina beads | Geothermal field | Silica | pH modification | 150 h | |
Monitoring the flow rate through a fluidized-bed reactor | Geothermal field | Silica | pH modification Chemical impurities | 48 h | |
pH measurement | Geothermal field | Silica | pH modification with biochemical reactor | 30 days | |
Measurement of monomeric silica in water by molybdate colorimetry | Geothermal field | Silica | pH modification | 200 days | |
Weighing the scale deposited on stainless steel rods | Geothermal field | Metal silicate | Commercial inhibitors | 24 h | |
Measurement of silica in water by molybdate colorimetry | Cooling water | Silica | Dendrimers | 72 h | |
Weighing the scale collected in column | Cooling water | Silica | Polyelectrolyte | 10 days | |
Measurement of monomeric silica in water | Reverse osmosis treatment | Silica | Chelating reagent | 9 h |
