24973 version 1
Page 1 of 3
Optimise and manage drinking-water treatment waste processes
Level
5
Credits
4
Purpose
People credited with this unit standard are able to optimise and manage: the
sources of wastes in a water treatment plant, processes for managing
wastes, and operational issues associated with waste management and
disposal; and identify critical points, hazards, and preventive and corrective
actions in waste management 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.
Replacement information
This unit standard replaced unit standard 19352.
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
24973 version 1
Page 2 of 3
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.
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 the sources of wastes in a water treatment plant.
Performance criteria
1.1
The sources of wastes are optimised and managed in relation to the water
treatment plant.
Range
filter wastewater, separation wastewater.
Element 2
Optimise and manage processes for managing wastes.
Range
two 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
The typical equipment used, and its limitations, is optimised and managed for a
waste management process.
2.2
Efficiencies including chemical addition are optimised and managed for a waste
management process.
2.3
Disposal options are optimised and managed for a waste management process.
Range
to the natural environment, downstream processing, recycling.
 New Zealand Qualifications Authority 2016
24973 version 1
Page 3 of 3
Element 3
Optimise and manage operational issues associated with waste management and
disposal.
Performance criteria
3.1
Operational issues are optimised and managed for a waste management
process.
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, and preventive and corrective actions in waste
management processes.
Performance criteria
4.1
The critical points in 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 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.
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