State two processes that are carried out during the primary treatment of sewage. - Leaving Cert Chemistry - Question 1 (f) - 2014
Question 1 (f)
State two processes that are carried out during the primary treatment of sewage.
Worked Solution & Example Answer:State two processes that are carried out during the primary treatment of sewage. - Leaving Cert Chemistry - Question 1 (f) - 2014
Step 1
Process 1: Screening
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Answer
The first process in the primary treatment of sewage is screening, which involves the removal of large solids and debris from the sewage. This is typically done using screens or grates that allow water to flow through while trapping larger particles.
Step 2
Process 2: Sedimentation
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Answer
The second process is sedimentation, also known as settling. In this stage, sewage is held in a large tank where heavier solids can settle to the bottom. This allows for the separation of solids from the liquid portion of the sewage, resulting in primary sludge.
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