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

9 Questions2 MinutesCreated by FilteringStream487

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

Preliminary Treatment

Preliminary Treatment Quiz

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