17885 version 2
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Demonstrate knowledge of oxidation ponds in wastewater treatment
processes
Level
3
Credits
7
Purpose
People credited with this unit standard are able to: describe the purpose of
oxidation ponds; identify the process options for oxidation ponds; and identify
tests and performance measures of oxidation ponds, in wastewater treatment
processes.
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.
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
Definition
Wastewater includes stormwater and sewage systems.
In the context of this unit standard, oxidation pond includes aerated lagoons, primary and
secondary ponds, facultative ponds, polishing ponds.
 New Zealand Qualifications Authority 2016
17885 version 2
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Elements and performance criteria
Element 1
Describe the purpose of oxidation ponds in wastewater treatment processes.
Performance criteria
1.1
The purpose of an oxidation pond is described in terms of the stabilisation and
reduction of contaminants in wastewater.
Range
1.2
settlement of solids, anaerobic digestion, aerobic oxidation,
buffering of flows and loads.
Oxidation pond treatment is described in terms of the process outputs.
Range
effluent quality, indicator organism reduction, diurnal fluctuation.
Element 2
Identify the process options for oxidation ponds in wastewater treatment processes.
Performance criteria
2.1
The pond options and processes for oxidation pond treatment are identified in
terms of inputs, outputs, and mode of operation.
Range
2.2
processes include but are not limited to – settlement, aerobic,
sequencing, oxygen control.
Oxidation pond treatment is described in terms of the advantages and
disadvantages of each pond option.
Range
evidence is required for at least two advantages and two
disadvantages.
Element 3
Identify tests and performance measures of oxidation ponds in wastewater treatment
processes.
Performance criteria
3.1
The process tests for oxidation pond treatment are described for each pond
option.
Range
effluent quality, indicator organism reduction;
may include but is not limited to – dissolved oxygen level, visual
colour, odour, pH, pond temperature;
evidence is required for at least three.
 New Zealand Qualifications Authority 2016
17885 version 2
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3.2
The performance measures applicable to each oxidation pond treatment
method are described in terms of efficiency and downstream effects.
Range
includes but is not limited to – dissolved oxygen levels,
microbiological indicator counts, Biochemical Oxygen Demand
(BOD), suspended solids, algal cell counts.
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.
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