Reverse Osmosis |
Multiple Effect Desalination |
The Reverse Osmosis Desalination process brings a flow of seawater first through a multimedia filter to remove any large impurities such as seaweed or sand. The seawater is then sent through a pair of high pressure pumps which force the flow though a membrane to remove salt from the water. The saltier brine flow is rejected and a "freshwater" product with low salt content is collected. The amount of salt in the permeate is measured with a conductivity reading on the outlet side of the membrane. A series of block valves make up a flush system which allows cleaning of both the filter and membrane.
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The Multiple Effect Desalination process runs seawater through a chain of three "effects" to remove salt from the input. The two streams leaving the system are a saltier brine flow, and a freshwater product. This MED process uses distillation principles to remove salt from the seawater in these jacketed vessels. An external steam flow is used to heat the first effect, and this energy is recovered to heat the downstream vessels as well. Trainees will track temperature, pressure and concentration profiles across the multiple effects. A Virtual Reality Outside Operator accompanies this program. |