Leaving Cert Chemistry Water & Water Analysis: The following words are omitted

Question

The following words are omitted from the passage below.
biological  aerobiology  nutrients  physical  chemical  eutrophication  microorganisms  sludge
Write in your answerbook the omitted word corresponding to each of the numbers (1 to 8).

In sewage treatment the first or primary treatment stage is 1 __. Its purpose is to remove most of the solid matter using meshes, grit channels and primary settlement tanks. Secondary treatment is 2 __ where the remaining organic matter in the sewage is broken down 3 __ by 4 __. Settlement tanks are often used again at the end of secondary treatment. Tertiary treatment, involving 5 __ processes, is expensive and is only used when it is necessary to remove 6 __ that could cause 7 __. The treated water is released to the sea, a river or a lake. The semi-solid by-product of sewage treatment is called 8 __.

The following words are omitted from the passage below - Leaving Cert Chemistry - Question 10 - 2020

Worked Solution & Example Answer:The following words are omitted from the passage below - Leaving Cert Chemistry - Question 10 - 2020

1 __

2 __

3 __

4 __

5 __

6 __

7 __

8 __

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