Water And Waste Water Treatment Practice N2 — Memo

November 2022 — N2 — Water And Waste Water Treatment Practice

N2 2022 Nated Engineering

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Q1— Section header —

1.1Total viable organisms

1.2Preliminary treatment treatment

1.3Secondary treatment

1.4Activated sludge

1.510

Q2— Section header —

2.1Parameter General tandard Special tandard Suspended solids

2.1.125 mg/ Faecal coliforms

2.1.3nil per 100 m Mercury

2.1.502 mg/ Arsenic

2.1.75 mg/ Height = 25 metres Diameter = 14 metres = =7 m Therefore: Volume = Area Height

2.320

Q3— Section header —

3.1Sodium ypochlorite is a clear light yellow liquid commonly used under arious brand names as a household bleach. The industrially available product has a strength of 15% to as low as 3,5% for household use.

Q4— Section header —

4.1.1Coagulation removes small particles made up of microbes, silt other suspended material in the water. (2\

4.1.2Clarification occurs in a large basin where water is again allowed to flow very slowly. Sludge, a residue of solids and water, accumulates at the bottom of the basin and is pumped or scraped out for eventual disposal.

4.1.4During disinfection , disease causing organisms are destroyed or disabled. Chlorine is the most common disinfectant because it is practical, effective and economical.

4.2[20]20

Q5— Section header —

5.1flows over the effluent weir and goes to disinfection. Activated sludge is pumped from the bottom and goes back to the reactor return activated sludge. Scum is

5.4In spot sampling dipper is used to take one sample of mixed liquor or effluent. This is not normally representative and only gives an idea of what is happening at the time of sampling A composite sample is composed of many grab spot

5.5Coarse bubble system Fine bubble system (2\ [20]20

Q6— Section header —

Mark Allocation

Sections10 + 20 + 20 + 20 + 20 + 10 = 100 marks

Paper information

TitleMemo

SubjectWater And Waste Water Treatment Practice

LevelN2

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 And Waste 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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