People dump all kinds of waste into the sewer everyday: salty (food scrap, urine), organic (bodily fluids, shower water), toxic (bleach, household cleaner), etc. And the swer system just takes it and handles it. What makes treating sea water so difficult when a typical city sewer has far more complicated and varying chemicals to deal with?
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Water treatment plants don’t have the mechanisms in place to remove salt nor were they designed too. The destruction & removal of organic matters are done in final steps after removal of grit & garbage, using various combinations of oxygen, chlorine, UV, bacteria, or flocculants. All processes that don’t remove salt. There are two large scale processes that can remove salt. Older distillation processes, modern plants use reverse osmosis membrane system.
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