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

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

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

Any physical, biological, or chemical change that degrades water quality is water .

Which of the following is water consumption?Multiple Choicebottling groundwater and shipping it to other stateswithdrawing drinking water from a local reservoirwatering your garden every day in summerreleasing treated wastewater in a local river