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Optimise and manage ozone disinfection processes for drinking-water
treatment
Level
5
Credits
8
Purpose
People credited with this unit standard are able to: optimise and manage
ozone disinfection processes, variables which determine their effectiveness,
design features, on-site generation of ozone, monitoring equipment, safety
considerations, and operating issues associated with ozone disinfection; and
identify critical points, hazards, preventive and corrective actions, in ozone
disinfection processes.
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
References
Legislation relevant to this unit standard includes but is not limited to the Health Act
1956, and Resource Management Act 1991.
Ministry of Health Public Health Risk Management Plan Guides for Drinking-Water
Supplies (PHRMPGs):
P7.3, Ozone disinfection;
Drinking-Water Standards for New Zealand, Ministry of Health, Wellington, 2000 and
2005.
 New Zealand Qualifications Authority 2016
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Definitions
Critical points – points in a process or in equipment where failure to function correctly
can lead to a public health hazard.
Optimise – adjusting plant input variables to make the process as effective as
possible in order to achieve the desired output.
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.
Elements and performance criteria
Element 1
Optimise and manage ozone disinfection processes, variables which determine their
effectiveness, and design features.
Performance criteria
1.1
Ozone processes which inactivate micro-organisms are optimised and
managed in relation to the ozone disinfection process.
1.2
The variables which determine the effectiveness are optimised and managed in
relation to the ozone disinfection process.
Range
1.3
includes but is not limited to – ozone residual, contact time,
temperature, turbidity, organic and inorganic loading.
Design features are optimised and managed in relation to the ozone disinfection
process.
Range
sizes, configurations.
Element 2
Optimise and manage on-site generation of ozone, monitoring equipment, and safety
considerations.
Performance criteria
2.1
The process of on-site generation of ozone is optimised and managed in
relation to the ozone disinfection process.
2.2
Monitoring equipment is optimised and managed in relation to the ozone
disinfection process.
Range
2.3
process control, alarms.
Delivery mechanisms of ozone which can contribute to under or over dosing are
optimised and managed in relation to the ozone disinfection process.
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2.4
Safety considerations when handling ozone are optimised and managed in
relation to the ozone disinfection process.
2.5
The ozone vapour destruction process is optimised and managed in relation to
the ozone disinfection process.
Element 3
Optimise and manage operating issues associated with ozone disinfection.
Performance criteria
3.1
Ozone disinfection is described in terms of operating issues.
Range
flow rates, continuity of power and disposables, dose rate control,
alarm response, disinfection of by-product formation, drinkingwater standard transgression, disinfection by-product formation,
equipment failure, safety of public, equipment calibration and
servicing, record keeping.
Element 4
Identify critical points, hazards, preventive and corrective actions, in ozone disinfection
processes.
Performance criteria
4.1
The critical points in the disinfection processes are identified in accordance with
organisational procedures.
4.2
The hazards at each critical point are identified in terms of the causes of the
events leading to their occurrence, and the risk factors.
4.3
The preventive and corrective actions for events related to each hazard are
identified.
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.
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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