Preliminary Treatment
Preliminary Treatment Quiz
Test your knowledge on the essential concepts of preliminary treatment in wastewater management. This quiz covers important topics, from equipment used to common problems encountered in the treatment process.
Featuring:
- 9 engaging questions
- Multiple choice format
- Assess your understanding and improve your knowledge
Which of the following assets is not part of the preliminary treatment process?
Screen & Compactor
Grit Removal
Flow Measuring Equipment
Aeration Ditch
What happens with flow in excess of full flow to treatment?
Pumped to receiving watercourse directly
Seperated in storm tanks
Floods the site
Passes through the usual treatment process
The purpose of preliminary treatment is to:
Settle out suspended solids so the site can meet its consent limits
Treat Ammonia so the site can meet its consent limits
Remove gross (large >6mm) and dense (grit) material from the sewage which might otherwise damage equipment and/or cause blockages
Remove gross (large >6mm) and sweetcorn from the sewage which might otherwise damage equipment and/or cause blockages
Which of the following is not a common problem with hand raked bar screens?
Older manually raked screens often have no system to clean and compress the screenings
They allow a lot of gross material – rags and paper to pass through, therefore the potential is for blockages later in the treatment process.
Do not remove the finer gross material
They are very noisy meaning they can lead to customer complaints
Which of these is not commonly used in preliminary treatment? (Pick 1)
Rotamat
Aeration equipment
Band Screen
Escalator Screen
Why do we remove screenings (RAGs) at the preliminary treatment stage? (Select all that apply)
They are unpleasant for operators to deal with
They cause blockages in pumps and pipes
Improved efficiency in the primary settlement
They can be incinerated to power the site
Which of the following are properties of a cross flow detritor? (Select all that apply)
Flow is distributed evenly across the whole tank by the deflectors
The grit settles to the bottom of the shallow (1 – 1.5m) tank
Treats BOD to ensure the site meets its consent limits
A flow of washwater separates the organics from the grit
Which of the below are common problems with cross flow detritors? (Select all that apply)
Build up of solids in corners
Deflectors moved – therefore not promoting an even flow across the complete tank
Flow can cause the detritor to spin too quickly meaning grit doesn't settle
Blockages in organics return chamber
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