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: 

Calculate and control chemical dosing parameters 
SAQA US ID UNIT STANDARD TITLE
115883  Calculate and control chemical dosing parameters 
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 4  NQF Level 04 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Reregistered  2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

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 does not replace any other unit standard and is not replaced by any other unit standard. 

PURPOSE OF THE UNIT STANDARD 
The qualifying learner achieving this unit standard in combination with context expertise standard(s) will be able to calculate the mass of chemical to be dosed in the water purification process. These calculations will be based on unit time or specific volume in order to comply with the prescribed water standard. This competence will provide the learner with broad based knowledge of chemistry and will contribute to the optimal operation of a water treatment plant. This competence will ensure a supply of good quality potable to consumers and contribute towards the protection of the environment. Achieving this unit standard will enhance the efficiency of the qualifying learner as a supervisor on a water purification works and advance his / her own expertise, skills and employability in water and related sectors. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
  • Mathematical calculations at NQF level 3 including fractions, percentages and ratios.
  • Literacy NQF level 3
  • Knowledge of the principles and operation of flocculation, coagulation, clarification, stabilisation, disinfection and separation. 

  • UNIT STANDARD RANGE 
    Solid chemicals
  • Aluminium sulphate, lime, soda ash and calcium hypochlorite

    Liquid chemicals
  • Flocculants, sodium hypochlorite and acids

    Relevant units of measurement
  • ml/min, g/min, kg/hour, tons/day

    Apparatus needed to perform calibration
  • Stopwatch, beakers, measuring cylinder, balance, hydrometer, jar test apparatus, pipette, pH meter, turbidity meter 

  • Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Prepare chemical solutions of pre-determined strengths. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The preparation of solutions of pre-determined strengths from liquid and solid chemicals is demonstrated. 

    ASSESSMENT CRITERION 2 
    The difference between a Mass/Mass solution and a Mass/Volume solution is explained. 

    ASSESSMENT CRITERION 3 
    The concepts of mg/l, g/m3 and kg/Ml and parts per million (ppm) are explained. 

    ASSESSMENT CRITERION 4 
    Volume and flow rate conversions are calculated. 

    SPECIFIC OUTCOME 2 
    Calculate the mass of chemical required obtaining a given dosage in a fixed volume of water. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The fixed volume to be used in the calculation is ascertained. 

    ASSESSMENT CRITERION 2 
    The mass of chemical required is calculated. 

    ASSESSMENT CRITERION 3 
    The calculation is checked and verified. 

    SPECIFIC OUTCOME 3 
    Calculate chemical application rate to obtain a fixed dosage within a constant flow rate of water. 
    OUTCOME NOTES 
    Calculate the chemical application rate in order to obtain a fixed dosage within a constant flow rate of water. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The flow rate is determined. 

    ASSESSMENT CRITERION 2 
    The required chemical application rate is calculated based on the flow rate and the dosage and is expressed in relevant units of measurement. 

    ASSESSMENT CRITERION 3 
    The calculation is checked and verified. 

    SPECIFIC OUTCOME 4 
    Calibrate chemical dosing equipment for dosing liquids and solids. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The apparatus needed to perform the calibration is identified. 

    ASSESSMENT CRITERION 2 
    The procedure to perform the calibration is demonstrated. 

    ASSESSMENT CRITERION 3 
    Calculations are performed based on the information obtained. 

    ASSESSMENT CRITERION 4 
    Delivery graphs or tables are constructed for dosing purposes. 

    ASSESSMENT CRITERION 5 
    Problems are identified and appropriate action is taken and explained. 

    ASSESSMENT CRITERION 6 
    Calibration equipment is cleaned and stored in accordance with work procedures and manufacturer's specifications. 

    SPECIFIC OUTCOME 5 
    Interpret jar test results to determine the optimum dosage. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The apparatus needed to conduct a jar test is identified. 

    ASSESSMENT CRITERION 2 
    The chemicals needed to conduct a jar test are prepared in accordance with work procedures. 

    ASSESSMENT CRITERION 3 
    A jar test is demonstrated. 

    ASSESSMENT CRITERION 4 
    The results obtained from the jar test are recorded and interpreted. 

    ASSESSMENT CRITERION 5 
    The optimum dosage is determined and applied on the water treatment plant. 

    SPECIFIC OUTCOME 6 
    Calculate chemical use (daily, weekly, monthly) and related costs for past or future time periods. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Chemical dosage rates are obtained from records and future dosage requirements are calculated. 

    ASSESSMENT CRITERION 2 
    Projections of water production are obtained from records and future water production is calculated. 

    ASSESSMENT CRITERION 3 
    Current chemical consumption (daily, weekly, monthly) is calculated accurately. 

    ASSESSMENT CRITERION 4 
    Total costs and costs per cubic metre of water are calculated accurately. 

    ASSESSMENT CRITERION 5 
    Optimal stock levels are calculated. 

    ASSESSMENT CRITERION 6 
    Stock levels are monitored and additional chemicals are ordered timeously in order to maintain optimal stock levels. 


    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 
  • The S.I. System (metric system of weights and measures).
  • The formula used to calculate the mass.
  • The indicators for a jar test (pH, hardness and turbidity).
  • Formula for calculating the chemical dosing mass.
  • Flocculant and chemical compositions.
  • Records.
  • The relevance of specific gravity (sg) to the calculation of solutions.
  • Accurate calibration.
  • Maintenance of calibration equipment.
  • SABS 241 (latest version)
  • Calibration intervals.

    Note: Delivery graphs and tables in this context are used to assist the operator in plotting delivery against setting. 

  • 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 are identified and appropriate action is taken and explained. 

  • 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:
  • The apparatus needed to perform the calibration is identified.
  • The apparatus needed to conduct a jar test is identified.
  • Stock levels are monitored and additional chemicals are ordered timeously in order to maintain optimal stock levels. 

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

    Assessment criteria:
  • The calculation is checked and verified.
  • The calculation is checked and verified.
  • Delivery graphs or tables are constructed for dosing purposes.
  • Problems are identified and appropriate action is taken and explained.
  • The results obtained from the jar test are recorded and interpreted. 

  • 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:
  • All 

  • UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    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 between 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 

  • QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  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.