Water Treatment Practice N3 — Memo

November 2022 — N3 — Water Treatment Practice

N3 2022 Nated Engineering

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Q1— Section header —

1.1Mg(OH\ + CO MgCO balancing (4\

1.4MgCO + Ca(OH\ Mg(OH\ [10]10

Q2— Section header —

2.1.1Filtration is the water treatment process involving the removal of suspended matter by passing the water through a porous medium such as sand. = 56 + (16 + 1\ = 12 + 16 = 28 g/mol

2.2.3

2.2.420

Q3— Section header —

3.1.1between the sand particles in order to loosen the floc particles. Air plays an important part in preventing the formation of mud balls. (3\

3.1.2There should be sufficient free board available so that the sand bed can expand during this process without and being lost. Temperature also plays a bigger role in low temperature than at high temperature

3.2The power that keeps the atoms together is of an electric nature. These electrically charged atoms that are kept apart from one other by means of water molecules are called ions. The positive ions are called cations and the negative ions anions.

3.3Lime treatment Oxidation with chlorine Horizontal flow sedimentation tank Vertical flow sedimentation tank [21]21

Q4— Section header —

4.1PRESSURE SAND FILTER (10\

4.2Postc hlorination Region where chloro organic compounds and chloramines are formed Region where chloramines and chlorine organic compounds are broken down Region beyond the breakpoint where free residual chlorine and a limited

4.4pHs = (9,3 + A + B\ ( C + D\ (2\ [19] Air valve Steel valve Air pipe Distribution trough Graded sand19

Q5— Section header —

5.1Apply oil, grease, vaseline or lard Metal coating Electroplating Spraying coatings (6\

5.2Careful operation is essential obtain a good result. (3\

5.3Sodium silicofluoride Soda acid extinguisher Class B: liquids like Gasoline, propane Dry foam chemical Class C:

5.5The type of testing required Date and time of sampling Date and time when sample was dispatched Name of the sampler Description of the sampling point Date when last rain occur ed and whether or not it was heavy

Mark Allocation

Sections10 + 20 + 21 + 19 + 30 = 100 marks

Paper information

TitleMemo

SubjectWater Treatment Practice

LevelN3

Document typeNated Engineering

Year2022

MonthNovember

Pages5

Downloads2

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,439

About Water Treatment Practice examination preparation

This TVET examination resource can be used as part of a structured revision programme. Past papers are most useful when learners attempt questions independently, work within a realistic time limit, and review their answers afterwards.

How to use this resource for revision

A TVET past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?

For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

understanding question requirements

applying subject knowledge

working under time constraints

checking answers

identifying revision priorities

A practical revision approach

Start by completing the resource without looking at the memorandum. Review incorrect and incomplete answers afterwards and make a short revision list based on the areas that caused difficulty.

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Archived on8 September 2026

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