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Students should be able to comment on the relative ease ofobtaining potable water from waste, ground and salt wate

Question

Students should be able to comment on the relative ease of obtaining potable water from waste, ground and salt water.

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Solution

Obtaining potable water from different sources varies in difficulty due to the processes involved.

  1. Waste Water: This involves a process called wastewater treatment which includes physical, chemical, and biological processes to remove contaminants and produce treated wastewater (or treated effluent) that is safe enough for release into the environment. The steps include preliminary treatment (removal of large particles), primary treatment (sedimentation), secondary treatment (biological process to remove dissolved organic matter), and tertiary treatment (removal of remaining inorganic compounds and pathogens). This process can be complex and requires a well-maintained system to ensure the water is safe for consumption.

  2. Ground Water: Groundwater is often naturally clean and safe to drink as it has been filtered through layers of the earth. However, it can still be contaminated by human activities, so it may need to be treated. The treatment process is usually simpler than for wastewater and may involve filtration and disinfection. The ease of obtaining potable water from groundwater largely depends on the availability of groundwater sources and the level of contamination.

  3. Salt Water: Desalination of salt water is the most energy-intensive and costly process among the three. It involves removing salts and other minerals from saline water. Methods include distillation, reverse osmosis, or electrodialysis. While technology is improving, desalination is still expensive and not feasible for many regions, especially those that are landlocked or have limited resources.

In conclusion, obtaining potable water from waste water and salt water involves complex processes and can be costly, while ground water is usually the easiest and least expensive to treat, provided it is not heavily contaminated.

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