24902 version 1
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Describe the management of ultraviolet (UV) disinfection processes
Level
5
Credits
5
Purpose
People credited with this unit standard are able to describe: UV disinfection
processes, variables which determine their effectiveness, and design
features; methods of UV generation, monitoring equipment, safety
considerations; and operating issues associated with UV disinfection; and
identify critical points, hazards, preventive actions, and corrective actions of
UV disinfection processes.
Subfield
Water Industry
Domain
Drinking-Water
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, unit standard 24900, and unit
standard 24901 replaced unit standard 18453.
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
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
24902 version 1
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2
Definitions
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.
Critical points – points in a process or in equipment where failure to function correctly
can lead to a public health hazard.
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
Describe UV disinfection processes, variables which determine their effectiveness, and
design features.
Performance criteria
1.1
UV disinfection processes are described in terms of the mechanisms by which
UV inactivates micro-organisms.
1.2
UV disinfection is described in terms of the variables which determine the
effectiveness of the process.
Range
1.3
includes but is not limited to – transmittance, contact time,
temperature, turbidity, organic and inorganic loading, intensity,
wavelength.
UV disinfection processes are described in terms of their design features.
Range
typical sizes, configurations.
Element 2
Describe the methods of UV generation, monitoring equipment, and safety considerations.
Performance criteria
2.1
UV disinfection processes are described in terms of types of the equipment
used for generation.
Range
2.2
reactor, low pressure and medium pressure lamps, ballasts,
intensity sensor, transmittance meter.
UV disinfection processes are described in terms of monitoring equipment.
Range
process control, alarms.
 New Zealand Qualifications Authority 2016
24902 version 1
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2.3
UV disinfection processes are described in terms of the delivery mechanisms of
UV light which can contribute to under or over dosing.
2.4
UV disinfection processes are described in terms of safety considerations when
handling.
Element 3
Describe operating issues associated with UV disinfection.
Performance criteria
3.1
UV disinfection is described in terms of operating issues.
Range
flow rates, continuity of disposables and power supply, dose rate
control, alarm response, drinking-water standard transgression,
corrosion, equipment failure, safety of public, equipment
calibration and servicing, record keeping.
Element 4
Identify critical points, hazards, preventive actions, and corrective actions of 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 appearance, 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.
 New Zealand Qualifications Authority 2016
24902 version 1
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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