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Title / Describe and operate ultraviolet disinfection processes in drinking-water treatment
Level / 4 / Credits / 8
Purpose / People credited with this unit standard are able to:describe ultraviolet disinfection processes; monitor and adjust the ultraviolet disinfection (UV) process; and carry out maintenance procedures on ultraviolet disinfection equipment;in drinking-water treatment.
Classification / Water Industry > Water Treatment
Available grade / Achieved
Explanatory notes
1Legislation and references relevant to this unit standard include:
Health and Safety at Work Act 2015, Hazardous Substances and New Organisms (HSNO) Act 1996, and subsequent amendments;
Drinking-water Standards for New Zealand, 2005 (Revised 2008). Ministry of Health, Wellington;
Guidelines for Drinking-water Quality Management for New Zealand 2015 (2nd ed). Ministry of Health, Wellington.
2Definition
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.
Outcomes and evidence requirements
Outcome 1
Describe ultraviolet disinfection processes in drinking-water treatment.
Evidence requirements
1.1Regulations and drinking-water standards relevant to ultraviolet disinfection are described in terms of their purpose, requirements, and consequences of non-compliance.
1.2Ultraviolet treatment theory is described in terms of disinfection of water supplies.
Rangedose, transmittance, intensity, cell disruption, vulnerability of pathogens, nil residual, water quality parameters, flow.
1.3Ultraviolet disinfection methods are described in terms of operation and factors that affect performance.
Rangeflow, design configuration.
1.4The ultraviolet disinfection process is described in terms of the function of its component parts and identification of process failure.
Rangecomponents – lamps (medium pressure, low pressure), ballast, transmittance meter, intensity sensor, cleaning systems.
Outcome 2
Monitor and adjust the ultraviolet disinfection (UV) process in drinking-water treatment.
Evidence requirements
2.1Monitoringequipment is calibrated, if required, tests or measurements for monitoring the process are carried out, and results are recorded, in accordance with Drinking-water Standards for New Zealandcompliance requirements and organisational procedures.
2.2Process isadjusted in accordance with organisational procedures.
Rangereasons for adjustment may include – results of monitoring and testing, analysis and identification of trends, response to process failure.
2.3Consumables are checked and ordered in accordance with organisational procedures.
Outcome 3
Carry out maintenance procedures on ultraviolet disinfection equipment in drinking-water treatment.
Evidence requirements
3.1Preventive maintenance procedures are carried out and recorded in accordance with organisational procedures.
3.2Any required repairs are carried out according to process and/or equipment failure, and recorded, in accordance with organisational procedures.
3.3Procedures for maintaining process continuity are carried out in accordance with organisational procedures.
Replacement information / This unit standard replaced unit standard 24952Planned review date / 31 December 2021
Status information and last date for assessment for superseded versions
Process / Version / Date / Last Date for AssessmentRegistration / 1 / 16 March 2017 / N/A
Consent and Moderation Requirements (CMR) reference / 0101
This CMR can be accessed at
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and which are assessing against unit standards must engage with the moderation system that applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies to this standard are outlined in the Consent and Moderation Requirements (CMR). The CMR 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 Infrastructure Industry Training Organisation you wish to suggest changes to the content of this unit standard.
Infrastructure ITOSSB Code 101813 / New Zealand Qualifications Authority 2018