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📘 Salt is dissolved, not merely floating

Seawater is not fresh water with a few visible grains mixed in. Its salts are dissolved into electrically charged particles called ions, including sodium and chloride. Ocean water is roughly 35,000 parts per million dissolved salt, while fr

5
lessons
~25 min
to learn
Adults
level
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What you’ll learn

  1. Start with seawaterExplain why saline water needs a molecular separation process and how intake and pretreatment prepare the feed.Desalination begins with a managed source-water system, not the membrane alone.
  2. Push water through a membraneDescribe osmosis, reverse osmosis, membrane elements, recovery, and the two streams produced by the process.Pressure drives water through compact membrane elements while salts remain in concentrate.
  3. Power the separationConnect pumps, energy recovery, electricity, and operating conditions to city-scale plant performance.Efficient pressure management determines much of the plant's energy and operating cost.
  4. Keep membranes workingIdentify fouling, scaling, cleaning, and monitoring practices that preserve membrane performance.Pretreatment, chemistry, maintenance, and measurement keep the separation train reliable.
  5. Finish and manage the waterTrace post-treatment, concentrate management, environmental interactions, and delivery into the city network.A complete plant must safely manage both its fresh-water product and its concentrated reject stream.

Questions this course answers

Why can a coarse screen not remove dissolved salt from seawater?

Screens catch larger debris such as seaweed and shells, but dissolved ions pass with the water.

What drives reverse osmosis?

Pressure reverses the natural osmotic direction and pushes water through the semipermeable membrane.

Match each part to its job.

The plant works as a linked process, with each part protecting or powering the membrane separation.

Why does membrane fouling usually reduce plant performance?

Fouling adds resistance and can change flow and chemistry at the membrane surface, requiring more pressure or cleaning.

Put the main seawater reverse-osmosis path in order.

The plant prepares the source, applies pressure to separate water, then conditions the product before delivery.

Why must a city-scale desalination design plan for both permeate and concentrate?

Permeate becomes a product-water stream that needs post-treatment and distribution, while concentrate carries retained salts and needs a safe, permitted disposal or discharge route.

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