Describe organic compounds including taste and odour control in water treatment processes



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NZQA Expiring unit standard

17900 version 3




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Title

Describe organic compounds including taste and odour control in water treatment processes

Level

4

Credits

4




Purpose

People credited with this unit standard are able to describe: the common organic compounds, in generating tastes and odours that occur in drinking water; and control processes used in water treatment to limit poor taste and odours.




Classification

Water Industry > Water Treatment




Available grade

Achieved


Explanatory notes
1 References

Legislation relevant to this unit standard includes but is not limited to the Health and Safety in Employment Act 1992, and Hazardous Substances and New Organisms (HSNO) Act 1996.



Drinking-Water Standards for New Zealand, 2005 (Revised 2008). Ministry of Health, Wellington.
2 Definition

Cracking – breaking long chain hydrocarbons.
3 A person is required to have approved handler certification if handling substances being transferred under the HSNO Act. Information on approved handler procedures can be obtained from http://www.erma.govt.nz.
Outcomes and evidence requirements
Outcome 1
Describe the common organic compounds, in generating tastes and odours that occur in drinking water.
Evidence requirements
1.1 The causes of tastes and odours in treated water are identified and described in terms of organic compounds in raw water.
Range includes but is not limited to – algae, geosmin, 2-MIB, actinomycetes, cyanobacteria.
1.2 Guideline values for aesthetic determinands are described in terms of the Drinking-water standards for New Zealand.
1.3 The chlorination of water supplies is described in terms of its effects in generating tastes and odours.
Range chloramines (mono, di, tri), water stagnation, chlorinated organics.
Outcome 2
Describe control processes used in water treatment to limit poor taste and odours.
Evidence requirements
2.1 The use of intake depth variations and infiltration galleries are described in terms of minimising turbidity and organic matter in a raw water supply.
2.2 The use of powdered activated carbon addition is described in terms of process mechanisms, dosing equipment, methods, and procedures.
Range includes but is not limited to –

equipment – dry powder feeders, slurry tank, dosing pumps;

methods – carry water, adsorption process;

procedures – dosing, flow control.


2.3 Granular activated carbon filtration is described in terms of plant design and process mechanisms.
Range plant design – location, components;

mechanisms – carbon surface structure and adsorption, activation life, biological filtration.


2.4 Ozonation and chlorination of drinking water for taste and odour control is described in terms of plant design and process mechanisms.
Range oxidation of organics, ammonia removal, breakpoint chlorination, cracking, flocculation;

plant design – location, components.


2.5 Alternative methods of filtration are described in terms of process mechanisms.
Range biological filtration without carbon, magnetic ion exchange.
2.6 The storage, handling, and preparation of chemicals are described in terms of the Health and Safety in Employment Act 1992, HSNO Act 1996 and regulations.



Replacement information

This unit standard and unit standard 24955 were replaced by unit standard 29991.


This unit standard is expiring. Assessment against the standard must take place by the last date for assessment set out below.
Status information and last date for assessment for superseded versions

Process

Version

Date

Last Date for Assessment

Registration

1

1 February 2001

31 December 2018

Review

2

19 September 2008

31 December 2018

Review

3

16 March 2017

31 December 2018




Consent and Moderation Requirements (CMR) reference

0101

This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note

Providers must be granted consent to assess against standards (accredited) by NZQA, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment.


Industry Training Organisations must be granted consent to assess against standards by NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and which are assessing against unit standards must engage with the moderation system that applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies to this standard are outlined in the Consent and Moderation Requirements (CMR). The CMR also includes useful information about special requirements for organisations wishing to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements.

Infrastructure ITO

SSB Code 101813



Ó New Zealand Qualifications Authority 2018




New Zealand Qualifications Aut




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