Waste Water Treatment Practice N3 — Document

August 2021 — N3 — Waste Water Treatment Practice

N3 2021 Nated Engineering

↓ Download PDF 📄 230 KB

Preparing document

📋 Document Analysis

🎯 100 marks ⏱️ 3h 📄 6 pages 📝 49 items found

See full analysis

Questions — A Preview of What to Expect in the Document

This section provides a quick preview of questions from the document. It may not display every question or the complete wording of each one. For the full content, including diagrams, tables and other information, view the original PDF above.

Q1— Section header —

1.5\in the ANSWER BOOK.

1.11 m equals 10

1.2

1.3he formula for pressure per unit area exercised by water at a depth of one meter

1.4Algae serves as food for mosquitoes fish

1.5The bacteria convert nitrite ions to nitrates during nitrification

Q2— Section header —

2.5\n the ANSWER BOOK. COLUMN COLUMN

2.5Valves that open under the influence of pressure ump that is not damaged by sand Bacteria that perform well at 55 The process where water turns into vapour It is expressed as the number of moles per volume

Q3— Section header —

3.5\n the ANSWER BOOK.

3.1Grit can be removed at the detritus channel.

3.2Ammonium hydroxide is a strong alkali.

3.3The chemical symbol for aluminium is Al.

3.4Eutrophication is the enrichment of water reserves with ulphur.

3.5Reclamation is a common demineralisation process. (5 2\ (10\ [10] TOTAL SECTION A: 2010

Q4— Section header —

4.1Define the following terms:

4.1.1Power

4.1.2Flow rate

4.1.3

4.2

4.3Write down the chemical formulae of the following:

4.3.1Calcium arbonate

4.3.2

4.4List SIX uses of activated carbon. (6\ [20]20

Q5— Section header —

5.1The main purpose of primary sedimentation is to permit separate treatment of the solid and liquid fractions in sewage.

5.1.1Define sedimentation (2\

5.1.2List FIVE factors affecting the sedimentation process. (5\

5.1.3What causes the offensive smell in the sedimentation or settling process? (3\

5.1.4Name TWO chemicals that are used to remove phosphate from sewage. (2\

5.2Desludging is an important operation as the efficiency of both the sludge treatment and biological treatment processes are dependent on it. Explain the problems that can be encountered if the sludge has

5.2.1oo much water

5.2.2

5.3Name the tool that is used to remove scum. (2\ [20] 81200020

Q6— Section header —

6.1Draw a labelled sketch illustrating the biological process in a filter bed. (10\

6.2Name any TWO types of settling tanks. (2\

6.3List FOUR types of records to be kept n a biofilter (4\

6.4What are the standards of the following as set for biofilter efficiency

6.4.1pH

6.4.220

Q7— Section header —

7.1Write down a reaction where an organic carbon is oxidi ed to gaseous CO (3\

7.2Explain what MLSS is (3\

7.3List SIX methods of disinfection. (6\

7.420

Mark Allocation

Total100 marks

Sections5 + 5 + 10 + 20 + 20 + 20 + 20 = 100 marks

Paper information

TitleDocument

SubjectWaste Water Treatment Practice

LevelN3

Document typeQuestion paper

Year2021

MonthAugust

Pages6

Downloads3

Examination context

Decade2020s

Years ago5y

SeasonWinter (SH)

Start daySunday

Exam periodAugust 2021

Days since exam1,896

About 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.

File details

File size230 KB

Pages6

Archived on8 September 2026

File age45d

ContributorFreeMode

Fingerprint2B23DBF628C5

Questions and learner discussion

No questions or discussions have been posted yet.