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BEST Task 1 IELTS Academic Writing, 7th October
ACADEMIC WRITING TASK 1
ACADEMIC WRITING TASK 1
The diagram below shows how salt is removed from sea water to make it drinkable. Summarize the information by selecting and reporting the main features, and make comparisons where relevant.
SAMPLE ANSWER
The flow chart gives information about the process of producing clean water from salt water so that it can be used for drinking.
Overall, sea water has to follow four main steps to be drinkable, beginning with pretreatment filter stage and ending with storage stage.
At first, water which is taken from the sea must go through pretreatment step before filtration. Under high pressure, the treated water then is forced through the membrane. The membrane only allows water molecules to pass, thus impurities and salt are eliminated. The waste of the first two steps, filter backwash, and seawater concentrate, are all given back to the sea while the main product is continued in further steps.
Subsequently, the filtered water is post-treated with lime, chlorine, and fluoride in the third processing stage. The product of this final main step is drinkable water. Before being transferred into integrated water supply system, clean water is stored at storage conditions.
