Improving Water Quality Purification of Drinking Water General process: Collected from reservoir or...

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Improving Water Quality

Purification of Drinking Water

General process:

Collected from reservoir or ground water.

General process:

Water treated

YouTube - The water treatment process

Water treatment includes:

1. Treatment with a coagulant

2. Filtration

3. Activated carbon

4. Disinfection

5. fluoridation

Water Treatment Plant

Disinfection can be one of the following:

1. Chlorine

2. Ozone

3. UV-light

General process:

Distributed to customersWastewater collected as sewage

General process:

Sewage treated

Videos:

YouTube - "where does it go?" THE MOVIE

YouTube - What happens when you flush?

YouTube - Waste Water Treatment Made Simple...

YouTube - California plant turning raw sewage into drinking water

Municipal Sewage Treatment

Primary treatment – removal of suspended and floating particles by mechanical processes such as screening and gravitational settling.

Secondary Treatment –Biological decomposition of suspended

organic matter

Tertiary Treatment -Variety of biological, chemical, and physical

processes used to remove minerals, heavy metals, viruses, organic compounds, nitrogen, phosphorus, etc.

Primary and Secondary Sewage Treatment

Effectiveness of primary, secondary, and tertiary sewage treatment

• Major problem associated with wastewater treatment is disposal of sludge

• Can be used as fertilizer, but there may be health risks (e.g., heavy metal poisoning)

• Used to be dumped in ocean. That is now banned

• Currently, most is dumped in landfills

Individual Septic Systems

Septic tank

Individual Septic Systems

Drain field

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