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Title / Manage, monitor, and optimise lagoon processes in wastewater treatment
Level / 5 / Credits / 7
Purpose / People credited with this unit standard are able to:demonstrate knowledge of lagoon process management; and manage, monitor, and optimise, lagoon processes in wastewater treatment.
Classification / Water Industry > Wastewater Treatment
Available grade / Achieved
Explanatory notes
1Legislation relevant to this unit standard includes: Health and Safety at Work Act 2015, Resource Management Act 1991,Hazardous Substances and New Organisms (HSNO) Act 1996, and subsequent amendments.
2Definitions
Critical control point– specific point, procedure, or step in water treatment processes at which control can be exercised to reduce, eliminate, or prevent the possibility of a public health hazard.
Lagoon – an anaerobic or aerobic detention and treatment basin holding one or more days’ wastewater flow.
Optimise – adjusting plant input variables to make the process as effective as possible to achieve the desired output, taking into account the constraints of cost, human input, effluent quality, and resource consent requirements.
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.
Wastewatermay include stormwater and sewage systems.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of lagoon process management in wastewater treatment.
Evidence requirements
1.1Legislation and regulations relevant to lagoon processes are described in terms of their impact on process management.
1.2Lagoon processes are described in terms of type and design, and the functions of their components.
1.3Lagoon process management is described in terms of the mechanics of the process, required testing, and the data required for assessing performance.
1.4Lagoon process optimisation is described in terms of identification of areas for improvement and methods for implementing improvements.
1.5Critical control points of lagoon processes are identified and described in terms of their management.
Rangeorganisational procedures, adverse effects, causes or events leading to occurrence of adverse effects, preventive and corrective actions for problems or events related to adverse effects.
Outcome 2
Manage lagoon processes in wastewater treatment.
Evidence requirements
2.1Process variables are managed to achieve the desired parameters, and maintain process performance in accordance with organisational procedures.
Rangediurnal biological activity, lagoonloading.
2.2Lagoon performance is managed in terms of flow variations.
2.3Lagoon performance is managed in terms of sensory observation in accordance with organisational procedures.
Rangesensory observation – sight, smell;
observation of – lagoon sludge, hydrogen sulphide, ammonia, foaming.
Outcome 3
Monitor lagoon processes in wastewater treatment.
Rangeincludes but is not limited to – indicator organisms, inflow, outflow, Total Suspended Solids (TSS), Biochemical Oxygen Demand (BOD), Dissolved Oxygen (DO).
Evidence requirements
3.1Sampling is managed to ensure samples are collected in accordance with organisational procedures.
3.2Data is collected and interpreted in accordance with lagoon processes and organisational procedures.
Outcome 4
Optimise lagoon processes in wastewater treatment.
Evidence requirements
4.1The lagoon process variables and operating factors are adjusted for optimisation of the processin accordance with the results of monitoring.
4.2The critical control points in lagoon processes are managed in accordance with organisational procedures.
Replacement information / This unit standard replaced unit standard 24937 and unit standard 24944.Planned 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