24972 version 1
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Optimise and manage ultraviolet (UV) disinfection processes for
drinking-water treatment
Level
5
Credits
8
Purpose
People credited with this unit standard are able to: optimise and manage UV
disinfection processes, variables which determine their effectiveness, design
features, the equipment used for generation of UV, safety considerations,
operating issues associated with UV disinfection; and identify critical points,
hazards, and preventive and corrective actions in UV 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):
P7.4, Ultra-violet irradiation 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, taking into account the constraints of
cost, human input, water quality, and water demand.
Drinking-water supply – the supply catchment, treatment plant, and distribution. The
drinking-water supplier has responsibility for managing the public health risks of the
drinking-water supply.
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 UV disinfection processes, variables which determine their
effectiveness, and design features.
Performance criteria
1.1
The mechanisms by which UV inactivates micro-organisms are optimised and
managed in relation to UV disinfection processes.
1.2
The variables which determine the effectiveness of the process are optimised
and managed in relation to UV disinfection.
Range
1.3
includes but is not limited to – transmittance, contact time,
temperature, turbidity, organic and inorganic loading, intensity.
Design features are optimised and managed in relation to UV disinfection
processes.
Range
sizes, configurations.
Element 2
Optimise and manage the equipment used for generation of UV, and safety
considerations.
Performance criteria
2.1
The equipment used for generation is optimised and managed in relation to UV
disinfection processes.
Range
reactor, lamp, ballasts, intensity sensor, transmittance meter,
turbidity meter.
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2.2
Monitoring equipment is optimised and managed in relation to UV disinfection
processes.
Range
process control, alarms.
2.3
The delivery mechanisms of UV light which can contribute to under or over
dosing are optimised and managed in relation to UV disinfection processes.
2.4
Personal safety considerations are optimised and managed in relation to UV
disinfection processes.
Element 3
Optimise and manage operating issues associated with UV disinfection.
Performance criteria
3.1
Operating issues are optimised and managed in relation to UV disinfection
processes.
Range
flow rates, continuity of disposables and power supply, dose rate
control, alarm response, drinking-water standard transgression,
equipment failure, safety of public, equipment calibration and
servicing, record keeping.
Element 4
Identify critical points, hazards, and preventive and corrective actions in UV 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.
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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