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Sources and treatment of potable water

Using resources • Earth's resources and potable water

Key concepts

What you'll likely be quizzed about

  • Potable water meets chemical and microbiological standards for human consumption.
  • Groundwater is stored underground in the pores of rocks or sediments.
  • Seawater is ocean water containing about 35 grams of dissolved salts per liter.
  • Wastewater, originating from homes, industries, and storm runoff, includes organic pollutants, microbes, and suspended solids.
  • The source type typically determines the contaminants present and guides the treatment strategy.

Flashcards

Test your knowledge with interactive flashcards

What are the three main stages of conventional wastewater treatment?

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Primary (physical removal), secondary (biological treatment), and tertiary (advanced removal of remaining contaminants).

Key notes

Important points to keep in mind

Potable water standards require chemical and microbiological safety.

Groundwater treatment often involves aeration, filtration, softening, and disinfection.

Seawater desalination removes dissolved salts but requires high energy.

Pre-treatment protects membranes from particulates and organics.

Wastewater treatment includes primary, secondary, and tertiary stages.

Advanced purification enables potable reuse but increases complexity.

Brine disposal and energy use are significant limitations of desalination.

Trace contaminants in wastewater require targeted treatments and continuous monitoring.

Residual disinfectants prevent microbial regrowth but need careful management to limit by-products.

The choice of water source depends on local availability, energy resources, and required quality.

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