24953 version 1
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Operate chlorine disinfection processes in water treatment
Level
4
Credits
12
Purpose
People credited with this unit standard are able to: monitor and adjust
chlorine disinfection process inputs; carry out preventive maintenance
procedures and repairs on chlorine disinfection equipment; and describe the
storage, handling, and preparation of chemicals, and chemical dosing
systems used in chlorine disinfection processes, in water treatment.
Subfield
Water Industry
Domain
Water 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 and visit by NZQA, industry
and teaching professional in the same field from another
provider.
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
Reference
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.
2
Definition
Organisational procedures – instructions to staff and procedures which are
documented in memo or manual format and are available in the workplace. These
procedures include but are not limited to – site specific procedures, laboratory
procedures, manufacturers’ specifications, product quality specifications and
reference to legislative or regulatory procedures relevant to the industry.
 New Zealand Qualifications Authority 2016
24953 version 1
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3
A person is required to have approved handler certification if handling substances
being transferred under the HSNO Act 1996. Information on approved handler
procedures can be obtained from http://www.erma.govt.nz.
Elements and performance criteria
Element 1
Monitor and adjust chlorine disinfection process inputs in water treatment.
Range
process inputs include but are not limited to – chlorine residual, chlorine
demand, pH, turbidity, contact time, flow rate, temperature.
Performance criteria
1.1
Testing equipment is calibrated, if required, tests or measurements for
monitoring process inputs are carried out, and results are recorded, in
accordance with consumer demand, compliance procedures, and organisational
procedures.
1.2
Process inputs are adjusted in accordance with results of testing.
1.3
Process history is analysed, trends are identified, and process inputs are
adjusted in accordance with organisational procedures.
1.4
Process inputs are adjusted in response to process failure in accordance with
organisational procedures.
1.5
Consumables are checked and ordered in accordance with organisational
procedures.
Element 2
Carry out preventive maintenance procedures on chlorine disinfection equipment in water
treatment.
Performance criteria
2.1
Preventive maintenance procedures are carried out, and recorded in
accordance with organisational procedures.
2.2
Procedures for maintaining process continuity are carried out in accordance
with organisational procedures.
2.3
Personal protective equipment is used while carrying out preventive
maintenance in accordance with health and safety procedures.
 New Zealand Qualifications Authority 2016
24953 version 1
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Element 3
Carry out repairs on chlorine disinfection equipment in water treatment.
Performance criteria
3.1
Repairs are carried out according to process and/or equipment failure, and
recorded, in accordance with organisational procedures.
3.2
Personal protective equipment is used while carrying out repairs in accordance
with health and safety procedures.
Element 4
Describe the storage, handling, and preparation of chemicals, and chemical dosing
systems used in chlorine disinfection processes in water treatment.
Performance criteria
4.1
The storage, handling, and preparation of chemicals used in chlorine
disinfection are described in terms of the Hazardous Substances and New
Organisms Act 1996.
4.2
Chemical dosing systems used in chlorine disinfection are described in terms of
the components, methods, and points of application.
Range
components – chemical pipework, dosing pumps, speed control,
stroke control, flow rate, dilutant, instrumentation for automatic
control.
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