Misty
Optimal performance of gas stripping, scrubbing and gas contacting can be achieved by attending to the following principles:
- Maintain a maximum difference in concentration of the constituent between the gas phase and water
- Maximize the surface area of water or wastewater in contact with air or other gas
- Prolong the contact time of water or wastewater in air or other gas via a long hold up time
- Provide ideal chemical and physical conditions such as pH and temperature to promote a shift of the constituent from water to air for water stripping or visa versa for gas scrubbing.
Misty introduces a fine mist of water into a gas headspace rather than introducing gas into water. This is achieved by means of a recirculation pump and special spray nozzles inside a tank, pit or other vessel with an enclosed headspace.
Misty maximizes the surface area : volume ratio and holdup time of fine water droplets in gas, and manipulates the chemical conditions of both water and gas to increase the rate and extent of gas: liquid transfer and reactions.
Introducing fine water droplets into gas is less energy intensive than the conventional approach of adding gas to water. This reduces energy cost and promotes the rate and extent of gas: liquid transfer.
1. Water stripping: remove dissolved constituents from water to form a gas, or
2. Gas scrubbing: remove constituents from a gas by dissolving them into water.
Gas scrubbing exploits the gas: liquid equilibrium of gaseous constituents such as ammonia, carbon dioxide, oxygen, ozone, or hydrogen sulphide for mass transfer from the gas phase into water or other liquid. Applications include:
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