SAQA All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.
SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE: 

Operate and maintain various disinfection and oxidation processes 
SAQA US ID UNIT STANDARD TITLE
115961  Operate and maintain various disinfection and oxidation processes 
ORIGINATOR
SGB Water Sector 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 12 - Physical Planning and Construction Civil Engineering Construction 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 5  Level TBA: Pre-2009 was L5 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "Reregistered" 
2007-05-15  2008-06-11  SAQA 0160/05 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2009-06-11   2012-06-11  

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.  

This unit standard is replaced by: 
US ID Unit Standard Title Pre-2009 NQF Level NQF Level Credits Replacement Status
255975  Supervise the various disinfection and oxidation processes  Level 5  Level TBA: Pre-2009 was L5  Complete 

PURPOSE OF THE UNIT STANDARD 
The qualifying learner achieving this unit standard in combination with context expertise standard(s) will be able to explain the principles and use of oxidants for disinfection purposes. This competence will enable the learner to operate various disinfection processes, maintain disinfection processes within own scope of work on a water treatment plant and monitor and control oxidant dosing. This competence will broaden the learner's range of competence and improve his/her employment potential in the water sector. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
  • Knowledge of chlorine dosing process
  • Mathematical calculations at NQF level 3 including fractions, percentages and ratios, Literacy NQF level 3 

  • UNIT STANDARD RANGE 
    Oxidants
  • Chlorine, Chlorine dioxide, Ozone, Chloramine, Ultra-violet light

    Oxidant demand
  • CT-value, break point value and energy requirement

    Factors affecting reactivity
  • Water quality, temperature, pH, contact time, oxidant dose, and UV radiation

    Routine maintenance
  • Manufacturers manuals, UV-lamps and sleeves, vacuum regulators, ejectors, level indicators, dosing pumps

    Meter readings
  • Air/gas flow meters, water meters, pressure meters, temperature meters, dew point meters

    Equipment for residual measurement
  • Comparator (e.g. Lovibond), DPD tablets Dräger tubes, gas flow meter, KI-solution, aspirator

    Specialised safety equipment
  • Gasmasks, breathing apparatus, eye protection, leak detectors and extractor fans 

  • Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Demonstrate knowledge of principles of oxidation for disinfection purposes. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The purpose of the addition of oxidants in water treatment is explained. 

    ASSESSMENT CRITERION 2 
    The concept of oxidant demand is explained. 

    ASSESSMENT CRITERION 3 
    The performance of a plant related oxidant demand test is demonstrated and optimum dose from the test is determined using calculations and set formulae. 

    ASSESSMENT CRITERION 4 
    Factors influencing the reactivity of oxidants are identified. 

    ASSESSMENT CRITERION 5 
    The concept of CT-value (concentration time) for various oxidants is explained. 

    SPECIFIC OUTCOME 2 
    Operate and maintain various disinfection processes. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Components of own disinfection process are identified. 

    ASSESSMENT CRITERION 2 
    Functions of components of disinfection process on own plant are explained. 

    ASSESSMENT CRITERION 3 
    Routine maintenance necessary within own scope of responsibility on the treatment plant is demonstrated. 

    ASSESSMENT CRITERION 4 
    Safe handling procedures when working with oxidants and applicable equipment are demonstrated. 

    ASSESSMENT CRITERION 5 
    Problems such as faults and operational problems are identified, recorded and appropriate corrective action is taken. 

    SPECIFIC OUTCOME 3 
    Monitor and control oxidant dosing. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The dose rate for applicable oxidant in accordance with water flow rate and target oxidant level is calculated. 

    ASSESSMENT CRITERION 2 
    The applicable oxidant is dosed continuously at the correct rate to the correct dosing point on the treatment plant. 

    ASSESSMENT CRITERION 3 
    Dosing rates and meter readings are monitored, adjusted and recorded accurately in accordance with work procedures. 

    ASSESSMENT CRITERION 4 
    Residual disinfectant level is measured at the applicable point using the appropriate method and equipment. 

    ASSESSMENT CRITERION 5 
    Operational problems are identified, recorded and reported immediately. 

    ASSESSMENT CRITERION 6 
    Safe working practises are followed at all times. 

    SPECIFIC OUTCOME 4 
    Monitor and control oxidant storage and handling. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The display of hazardous chemicals chart is checked to ensure compliance with the Regulations. 

    ASSESSMENT CRITERION 2 
    Specialised safety equipment and warning systems are inspected, recorded and defects are reported. 

    ASSESSMENT CRITERION 3 
    Safe handling procedures whilst storing and handling oxidants are monitored. 

    ASSESSMENT CRITERION 4 
    Usage of specialised safety equipment is monitored to ensure compliance with safety regulations. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • Anyone assessing a learner or moderating the assessment of a learner against this unit standard must be registered as an assessor with the relevant ETQA.
  • Any institution offering learning that will enable the achievement of this unit standard must be accredited as a provider with the relevant ETQA.
  • Assessment and moderation of assessment will be overseen by the relevant ETQA according to the ETQA's policies and guidelines for assessment and moderation.
  • Moderation must include both internal and external moderation of assessments at exit points of the Qualification, unless ETQA policies specify otherwise. Moderation should also encompass achievement of the competence described both in individual unit standards as well as the integrated competence described in the Qualification. 

  • UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
  • Appropriate personal protective clothing.
  • Calculations and formulae.
  • Oxidation-reduction processes.
  • Redox potential.
  • CT-value.
  • The role of ammonia in the disinfection process (chloramination).
  • Inactivation of micro-organisms.
  • Use of indicator organisms for control of water quality.
  • SABS 241 - latest version.
  • Breakpoint chlorination, super chlorination, dechlorination, free chlorine, combined chlorine, total chlorine.
  • Retention time, contact time, contact tank design.
  • Relevant legislation: OHS Act, personal safety.
  • Water-borne diseases, e.g. gastro-enteritis, cholera, typhoid, dysentery, hepatitis, polio.
  • Applicable disinfectant by-products (Trihalomethanes, chlorate, bromate, formaldehyde)
  • Requirements for safe storage of oxidants. 

  • UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems in which responses display that responsible decisions using critical and creative thinking have been made.

    Assessment criteria:
  • Problems such as faults and operational problems are identified, recorded and appropriate corrective action is taken.
  • Operational problems are identified, recorded and reported immediately.
  • Specialised safety equipment and warning systems are inspected, recorded and defects are reported. 

  • UNIT STANDARD CCFO WORKING 
    Work effectively with others as a member of a team, group, organisation, and community.

    Assessment criteria:
  • All 

  • UNIT STANDARD CCFO ORGANISING 
    Plan, organise and manage oneself and one's activities responsibly and effectively.

    Assessment criteria:
  • All 

  • UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organise and critically evaluate information.

    Assessment criteria:
  • Problems such as faults and operational problems are identified, recorded and appropriate corrective action is taken.
  • Dosing rates and meter readings are monitored, adjusted and recorded accurately in accordance with work procedures.
  • Operational problems are identified, recorded and reported immediately.
  • Specialised safety equipment and warning systems are inspected, recorded and defects are reported. 

  • UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively using visual, mathematical and/or language skills in the form of oral and/or written presentation.

    Assessment criteria:
  • All 

  • UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically, showing responsibility towards the environment and health of others.

    Assessment criteria:
  • All 

  • UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems by recognising that problem-solving contexts do not exist in isolation.

    Assessment criteria:
  • Problems such as faults and operational problems are identified, recorded and appropriate corrective action is taken.
  • Operational problems are identified, recorded and reported immediately.
  • Specialised safety equipment and warning systems are inspected, recorded and defects are reported. 

  • UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    UNIT STANDARD NOTES 
    This unit standard has been replaced by unit standard 255975, which is "Supervise the various disinfection and oxidation processes", Level 5, 6 credits.

    Integrated Assessment

    When conducting assessments, assessors must ensure that they are familiar with the full text of the unit standards being assessed. Assessors must ensure that the assessment covers the specific outcomes, critical cross-field outcomes and essential embedded knowledge by developing assessment activities and tools, which are appropriate to the contexts in which the learners are working. These activities and tools may include self-assessment, peer assessment, formative and summative assessment. It may be more effective and efficient to assess a number of unit standards together in an integrated way, thus reducing the overall number of assessments and ensuring that commonalities that exist among a number of unit standards are captured in a way that makes sense for assessment.

    Assessment Option

    Learners could be assessed using the following methods:
  • Oral or written questions
  • Observation
  • Evaluation of records and calculations

    Definition:
  • Oxidants relate to chemicals that produce disinfection in water through oxidation processes.
  • CT-values relate to the cumulative effect of dosage and contact time for an oxidant in water.
  • Chloramines refers to the addition of ammonia to recently chlorinated water to form monochloramine. 

  • QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Elective  48910   Further Education and Training Certificate: Water Purification Processes  Level 4  NQF Level 04  Reregistered  2023-06-30  EWSETA 


    PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD: 
    This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.
     
    1. HIZONEX PTY LTD 
    2. Learn A Trade 
    3. PERSEVCON CONSTRUCTION PTY LTD 
    4. PTDEV (PTY) LTD 



    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.