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[IELTS-TASK1] Progress Diagram of Seawater Desalination


answers: 5
Dear friends, please give me some comments and advice on my writing practice. Thank you very much.

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. Write at leat 150 words. The link here may lead you to the chart: http://teachingmaterial.blog.sohu.com/148376350.html

The diagram describes various stages in seawater desalination, converting saltwater to freshwater to make it suitable for drinking.

First of all, raw water is intaken from the sea and then it passes through the pre-treatment filter, where large debris is removed and the backwash is sent back to the sea. The second step is to force the seawater to pass through a membrane at high pressure. At this stage, particles with larger molecules than water, such as impurities and salt, are screened before other purification steps. Such substances are assembled together with those from the first stage and returned to the sea. Following the physical purification is the chemical treatment. This process requires post-treatment with lime, chlorine and fluoride. The in coming water is chlorinated to minimize the growth of fouling organisms on the pipe-works and tanks. The purified water is subsequently stored in reservoirs and then distributed to integrated water supply system.

The processed water is clean and safe after the standard physical filtration and chemical purification.

Apr 14, 2010, 12:27am   #
First of all, saltwater is intaken from the sea and then it passes through the pre-treatment filter,

Such substances [delete "are assembled"], together with those from the first stage, return to the sea.
vivien_wang:
First of all, raw water is intaken from the sea and then it passes through the pre-treatment filter, where large debris is removed and the backwash is sent back to the sea.

This sentences is so well-constructed. It has nice rhythm.

Wei, all of this is excellent. I see only one error:
The incoming water is chlorinated to minimize the growth of fouling organisms on the pipe-works and tanks.

Everything about this essay is so clear and elegantly expressed. I'm not trying to blow happy sunshine at you... I'm just saying this is some very professionally written material.
Apr 21, 2010, 04:21am   #
4:40
The chart illustrates the process of seawater desalination, which are coped with by total four steps to make seawater safer for humans to drink.

It can be clearly seen that the seawater is first taken into the pre-treatment filter container through a pipe where the filter backwash is returned to the sea by another pipe; next, the left water is forced to through membrance at high pressure, where the water molecules pass to the next step while the left concentrated seawater which contains the salt and inpurities is returned to the sea once again; the third step is the post-treatment, which tranfers the water into the container where are filled with lime, chlorine and fluoride. Afterwards, the water is stored into the storage where it is prepared for integrating into the water supply system for human consumption.

Over all, there are total four steps which could be divided into three main processing procedures and one storage procedure from seawater to freshwater by the seawater desalination equipment.
5: 10

Ps: Here I am just trying to write an essay under your provided topic, It is not intended to revise yours as your essay has been rather perfect. Besides, about the word 'intake', I check it on the dictionary, it seems it is a noun. (please check once again)

(Welcome any criticism)
The chart illustrates the process of seawater desalination, which are coped with by total includes four steps in total to make seawater safer for humans to drink.

It can be clearly seen that the seawater is first taken into the pre-treatment filter container through a pipe where the filter backwash is returned to the sea by another pipe. Next, the leftfiltered/treated/processed water is forced to pass through membrance at high pressure, where the water molecules pass to the next step while the left concentrated seawater which contains the salt and inpurities is returned to the sea once again. The third step is the post-treatment, which tranfers the water into the container wherewhich are filled with lime, chlorine and fluoride. Afterwards, the water is stored into the storagein reservoirs where it is prepared for integratingbeing integrated into the water supply system for human consumption.

Overall, there are total four steps in total which could be divided into three main processing procedures and one storage procedure from seawater to freshwater bywith the seawater desalination equipment.

cathyliu:
about the word 'intake', I check it on the dictionary, it seems it is a noun. (please check once again)

Yes, you are right. I think I saw this word used as a verb. Maybe they were just some misuses. I should replace it with take in. Thank you very much:)



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