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Title / Describe wastewater oxidation pond treatment processes, and critical points
Level / 5 / Credits / 4
Purpose / People credited with this unit standard are able to: describe the type and design; describe and interpret tests; describe performance optimising; and identify critical points, adverse effects, and preventive and corrective actions, of wastewater oxidation pond treatment processes.
Classification / Water Industry > Wastewater Treatment
Available grade / Achieved
Explanatory notes
Definitions
Optimising – 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.
Critical points – points in a process or in equipment where failure to function correctly can lead to adverse effects which may affect the treatment process or other processes in the treatment plant.
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.
Oxidation pond includes aerated lagoons, primary and secondary ponds, facultative ponds, polishing ponds.
Oxidation ponds can also be referred to as waste stabilisation ponds.
Wastewater includes stormwater and sewage systems.
Outcomes and evidence requirements
Outcome 1
Describe the type and design of wastewater oxidation pond treatment processes.
Range aerated lagoons, primary and secondary ponds, facultative ponds, polishing ponds.
Evidence requirements
1.1 Oxidation ponds are described in terms of their type and design.
1.2 The function of bacteria and algae are described in terms of their role in achieving treatment.
Outcome 2
Describe and interpret tests of wastewater oxidation pond treatment processes.
Evidence requirements
2.1 Oxidation pond performance is described in terms of the timing and types of tests to be undertaken.
Range tests include but are not limited to – temperature, dissolved oxygen, pH, Biochemical Oxygen Demand (BOD), suspended solids, indicator organisms, nitrogen.
2.2 Test results are interpreted in relation to process variations.
Range loading, time.
Outcome 3
Describe performance optimising of wastewater oxidation pond treatment processes.
Evidence requirements
3.1 Results of monitoring are described in terms of the adjustments that may be carried out.
Outcome 4
Identify critical points of oxidation pond treatment processes, adverse effects, and preventive and corrective actions.
Evidence requirements
4.1 The critical points in oxidation pond treatment processes are identified in accordance with organisational procedures.
4.2 The adverse effects at each critical point are identified in terms of the causes or the events leading to their occurrence.
4.3 The preventive and corrective actions for problems or events related to each adverse effect are identified.
Replacement information / This unit standard and unit standard 24943 were replaced by unit standard 29943.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 / 19 September 2008 / 31 December 2018
Review / 2 / 16 March 2017 / 31 December 2018
Consent and Moderation Requirements (CMR) reference / 0101
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
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.
Infrastructure ITOSSB Code 101813 / Ó New Zealand Qualifications Authority 2017 / / New Zealand Qualifications Aut