24927 version 1
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Describe, and undertake sampling and testing procedures for
wastewater treatment
Level
3
Credits
9
Purpose
People credited with this unit standard are able to: describe the requirements
of a sampling plan and of sample storage; collect wastewater samples for
analysis; and compare and interpret the wastewater analytical results
received from the laboratory with plant operating process variables.
Subfield
Water Industry
Domain
Wastewater Treatment
Status
Registered
Status date
19 September 2008
Date version published
19 September 2008
Planned review date
31 December 2013
Entry information
Open.
Replacement information
This unit standard replaced unit standard 17878 and
17879.
Accreditation
Evaluation of documentation by NZQA and industry.
Standard setting body (SSB)
Primary Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0179
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
Definitions
Organisational procedures – instructions to staff, and procedures which are
documented in memo or manual format and are available in the workplace. These
requirements include but are not limited to – site specific requirements,
manufacturers’ specifications, product quality specifications, and legislative or
regulatory requirements.
Wastewater includes stormwater and sewage systems.
 New Zealand Qualifications Authority 2016
24927 version 1
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2
Assessment
Assessment for element 2 must be carried out on a wastewater treatment plant site.
Elements and performance criteria
Element 1
Describe the requirements of a sampling plan and of sample storage.
Performance criteria
1.1
The need for a representative sample is described in terms of the factors which
affect the reliability of process measurement.
Range
1.2
Changes that may occur during sample handling are described in accordance
with organisational procedures.
Range
1.3
includes but is not limited to – flow volume changes, effluent
strength variations, average daily levels versus peak levels,
oxidation pond cycling.
air losses/gains, oxidation, microbiological viability, temperature
effects.
Sample storage methods are described in terms of the analysing laboratory
requirements.
Range
any three storage and handling procedures.
Element 2
Collect wastewater samples for analysis.
Range
influent, effluent.
Performance criteria
2.1
Sampling is documented according to organisational procedures.
2.2
Samples are collected according to the programme set in the organisational
procedures.
2.3
Samples are handled and stored according to the requirements of the analysing
laboratory or organisational procedures.
 New Zealand Qualifications Authority 2016
24927 version 1
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Element 3
Compare and interpret the wastewater analytical results received from the laboratory with
plant operating process variables.
Range
influent, effluent.
Performance criteria
3.1
Physical characteristics of wastewater sample results are compared and
interpreted in relation to the plant process.
Range
3.2
Chemical characteristics of wastewater sample results are compared and
interpreted in relation to the plant process.
Range
3.3
characteristics may include but are not limited to – odour,
suspended solids, quantity, temperature, fats and grease content;
evidence is required for at least three.
characteristics may include but are not limited to – total kjeldahl
nitrogen, ammoniacal-N, nitrate-N, nitrite-N, pH, dissolved reactive
phosphorus, biochemical oxygen demand, chemical oxygen
demand, total organic carbon;
evidence is required for at least three.
Microbiological characteristics of wastewater sample results are compared and
interpreted in relation to the plant process.
Range
characteristics may include but are not limited to – algae type and
count, Standard Plate Counts, indicator organisms;
evidence is required for at least one.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP 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.
 New Zealand Qualifications Authority 2016
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Comments on this unit standard
Please contact the Primary Industry Training Organisation standards@primaryito.ac.nz if
you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016