able to:• distinguish between potable water and pure water• describe the differences in treatment of ground water andsalty water• give reasons for the steps used to produce potable water
Question
able to:• distinguish between potable water and pure water• describe the differences in treatment of ground water andsalty water• give reasons for the steps used to produce potable water
Solution
- Distinguish between potable water and pure water:
Potable water is water that is safe for humans to drink. It's free from contaminants and harmful bacteria or viruses. Pure water, on the other hand, is water that contains no other substance or impurities, it is H2O and nothing else. It's important to note that while all pure water is potable, not all potable water is pure. Potable water can contain minerals and other substances that are not harmful to humans.
- Describe the differences in treatment of ground water and salty water:
Ground water is usually treated by a process of filtration and disinfection. The water is first filtered to remove large particles and then a disinfectant (usually chlorine) is added to kill any bacteria or viruses.
Salty water, or seawater, requires a process called desalination to make it potable. This process involves removing the salt and other minerals from the water. This is usually done by distillation (boiling the water and then condensing the steam) or by reverse osmosis (forcing the water through a membrane that the salt can't pass through).
- Give reasons for the steps used to produce potable water:
The steps used to produce potable water are designed to remove any impurities and make the water safe to drink. Filtration removes large particles that could be harmful if ingested. Disinfection kills bacteria and viruses that could cause illness. In the case of seawater, desalination is necessary to remove the high levels of salt that make the water unsafe to drink.
Similar Questions
The terms ‘potable water’ and ‘drinking water’ both refer to water that comes from surface and ground sources and is treated to levels that that meet government issued standards for consumption and food preparation. True or False?
Water that is safe to drink is called potable water.Compare how easily potable water can be obtained from:• waste water (sewage)• ground water (fresh water).[6 marks]Question 7 continues on the next page
Students should be able to comment on the relative ease ofobtaining potable water from waste, ground and salt wate
What term is used to describe water that is safe for humans to drink? PotablePureBottledSterilised2What are the two main stages in the treatment of ground water to make it potable?Desalination and sterilisationDistillation and desalinationPassing it through filter beds and sterilisationPassing it through filter beds and desalination3Which of the following is not a method or substance used to kill microbes during the purification of water?UV lightOzoneAntibioticsChlorine4Which two processes can be used to make drinking water from sea water? Filtration and sterilisationDistillation and reverse osmosisFiltration and reverse osmosisDistillation and anaerobic digestion5In the treatment of waste water, sewage is screened to remove large pieces and then filtered to produce sewage sludge. How is the remaining liquid (or effluent) then treated? Aerobic biological treatmentAnaerobic digestionBoilingSterilisation6What are two possible uses of sewage sludge after further treatment? Animal feed and fertiliserFertiliser and potable waterBuilding material and renewable energy sourceFertiliser and renewable energy source
Another stage in the production of potable water is filtering. Explain why potable water contains dissolved solids after filtering.
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