NZQA Expiring unit standard
19327 version 4
Page 1 of 4
Title
Explain application and operation of biological wastewater treatment
systems in the dairy industry
Level
4
Credits
12
Purpose
People credited with this unit standard are able to explain:
biological mechanisms used for treatment of dairy factory
wastewater; principles of design and operation of biological
systems used for treatment of dairy factory wastewater; and
biological waste treatment sludge handling and disposal
methods.
Classification
Dairy Manufacturing > Dairy Environmental Management
Available grade
Achieved
Entry information
Critical health and
safety prerequisites
Open.
Explanatory notes
1
Organisational requirements refer to instructions to staff on policy and procedures
which are documented in memo and/or manual format and are available in the
workplace. These requirements include but are not limited to – site specific
requirements, company quality management requirements, hygiene, health and
safety, regulatory and legislative requirements.
2
Legislative requirements include but are not limited to Resource Management Act
1991, relevant codes of practice, and subsequent amendments.
3
Routine explanations and reports may be in everyday workplace language including
mathematical language and some commonly used technical terms, be presented
orally, be presented in writing using standard format, proforma, charts and diagrams,
include mathematical and other information from several sources.
4
Assessment is to be made in the industry context, and should take place primarily
on-the-job under normal working conditions.
5
Mathematical operations may include routine estimation and calculation and involve
percentages, comparisons, and variations. Calculators may be used.
6
All work practices must meet codes of practice and organisational requirements.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
19327 version 4
Page 2 of 4
Outcomes and evidence requirements
Outcome 1
Explain biological mechanisms used for treatment of dairy factory wastewater.
Evidence requirements
1.1
Biological treatment processes are explained in terms of mechanisms and
application.
Range
1.2
treatment mechanisms include but are not limited to – sorption,
stripping, biodegradation, nitrification, denitrification, phosphorous
adsorption.
Growth requirements for sludge microorganisms are explained in terms of a
means to ensure optimal growth of desirable types and minimisation of
undesirable types.
Range
sludge microorganisms – filamentous, flocculating;
growth requirements may include but are not limited to – nutrient
levels, organic matter, oxygen level, temperature.
Outcome 2
Explain principles of design and operation of biological systems used for treatment of dairy
factory wastewater.
Evidence requirements
2.1
Considerations are identified for selection and configuration of systems for
nutrient removal.
Range
2.2
Optimal system combinations are identified to match varying combinations of
wastewater characteristics and discharge requirements.
Range
2.3
wastewater characteristics and discharge requirements may
include but are not limited to – volume, nutrient levels, suspended
solids, temperature.
Operating variables are explained in terms of their level of influence for optimal
operation.
Range
2.4
systems – activated sludge, lagoon, anaerobic, biofilm,
membrane.
operating variables may include but are not limited to – dissolved
oxygen, hydraulic residence time, sludge age and characteristics.
Operating problems are explained in terms of causes and remedies.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
19327 version 4
Page 3 of 4
operating problems may include but are not limited to – bulking
sludge, foaming, rising sludge.
Range
Outcome 3
Explain biological waste treatment sludge handling and disposal methods.
Evidence requirements
3.1
Characteristics of biological waste treatment sludge are explained in terms of
handling and disposal considerations.
characteristics may include but are not limited to – solids content,
nutrient content, fat content.
Range
3.2
Methods used for sludge concentration are explained in terms of their principles
of operation and application.
concentration methods may include but are not limited to – gravity
thickening, flotation, centrifugation, filtration.
Range
3.3
Methods used for sludge disposal are explained in terms of their principles of
operation and application.
disposal methods may include but are not limited to – land fill, land
treatment, composting, incineration, wet oxidation.
Range
Replacement information
This unit standard has been replaced by unit standard
29125.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
28 May 2002
31 December 2018
Revision
2
13 June 2003
31 December 2018
Rollover
3
17 July 2009
31 December 2018
Review
4
17 September 2015
31 December 2018
Consent and Moderation Requirements (CMR) reference
0022
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
19327 version 4
Page 4 of 4
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.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016