24903 version 1
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Describe the management of water treatment plant waste management
processes
Level
5
Credits
8
Purpose
People credited with this unit standard are able to describe: the sources of
wastes in a water treatment plant; processes for managing wastes; and the
operational issues associated with waste management and disposal; and
identify critical points, hazards, preventive actions, and corrective actions of
drinking-water waste management 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 replaced unit standard 18454.
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
Ministry of Health Public Health Risk Management Plan Guides for Drinking-Water
Supplies (PHRMPGs):
P4.4 Waste liquor re-introduction.
2
Definitions
Critical points – points in a process or in equipment where failure to function correctly
can lead to a public health hazard.
 New Zealand Qualifications Authority 2016
24903 version 1
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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
Describe the sources of wastes in a water treatment plant.
Performance criteria
1.1
Wastes in a water treatment plant are described in terms of the sources.
Range
filter wastewater, separation wastewater.
Element 2
Describe the processes for managing wastes.
Range
three of – thickening, mechanical sludge dewatering, sludge dewatering by
drying, sewer disposal and conditioning, supernatant disposal, solids disposal to
land and landfill, retention ponds.
Performance criteria
2.1
Waste management processes are described in terms of the typical equipment
used, and its limitations.
2.2
Waste management processes are described in terms of the efficiencies of the
process and chemicals used.
2.3
Waste management processes are described in terms of the implications of
disposal options.
Range
to the natural environment, downstream processing, recycling.
 New Zealand Qualifications Authority 2016
24903 version 1
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Element 3
Describe the operational issues associated with waste management and disposal.
Performance criteria
3.1
Waste management and disposal is described in terms of the operational
issues.
Range
pathogen concentration and associated health risks, handling,
transportation, chemical and physical structure, moisture content
and flow, resource consent conditions and bylaw control.
Element 4
Identify critical points, hazards, preventive actions, and corrective actions of drinking-water
waste management processes.
Performance criteria
4.1
The critical points in the waste management 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.
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