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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE: 

Thicken and dewater sludge 
SAQA US ID UNIT STANDARD TITLE
12050  Thicken and dewater sludge 
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
Passed the End Date -
Status was "Reregistered" 
2005-02-09  2008-02-09  SAQA 1058/05 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2009-02-09   2012-02-09  

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
255979  Thicken and dewater sludge  Level 4  NQF Level 04  Complete 

PURPOSE OF THE UNIT STANDARD 
The qualifying learner achieving this unit standard in combination with context expertise standard(s) will be able to thicken and dewater sludge. This competence will enable the learner to operate and maintain sludge thickeners and dewatering processes and dispose of sludge in accordance with legislative requirements and sludge guidelines. In addition this competence will contribute to the economic sustainability of the environment and equip the learner with enhanced skills, thereby improving the learner`s motivation, employability and basic work experience. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
Numeracy NQF level 1;
Apply personal safety practices NQF level 2. 

UNIT STANDARD RANGE 
Work policies and procedures:
Best operating procedures.

Dewatering process:
Drying bed, centrifuge, belt press, filter press and sludge lagoons.

Thickening processes:
Diffused Air Flotation, gravity thickening and centrifuging.

Reports:
Maintenance, faults, breakdowns. 

Specific Outcomes and Assessment Criteria: 

SPECIFIC OUTCOME 1 
Operate sludge thickeners in accordance with work policies and procedures 

ASSESSMENT CRITERIA
 

ASSESSMENT CRITERION 1 
1. Inlet flow is controlled. 

ASSESSMENT CRITERION 2 
2. Water and solids separation equipment is operated. 

ASSESSMENT CRITERION 3 
3. Problems are identified and corrective action is explained. 

ASSESSMENT CRITERION 4 
4. Water portion is sent back to head of works. 

ASSESSMENT CRITERION 5 
5. Solids are disposed of in accordance with work policies and procedures. 

SPECIFIC OUTCOME 2 
Operate sludge dewatering process in accordance with work policies and procedures 

ASSESSMENT CRITERIA
 

ASSESSMENT CRITERION 1 
1. Inlet flow is controlled and monitored. 

ASSESSMENT CRITERION 2 
2. Sludge is dewatered. 

ASSESSMENT CRITERION 3 
3. Problems are identified and corrective action is explained. 

ASSESSMENT CRITERION 4 
4. Sludge is disposed of in accordance with sludge guidelines and the importance of doing this is explained. 

ASSESSMENT CRITERION 5 
5. Water portion is sent back to head of works. 

SPECIFIC OUTCOME 3 
Maintain sludge thickener and dewatering equipment in accordance with work procedures 

ASSESSMENT CRITERIA
 

ASSESSMENT CRITERION 1 
1. Routine maintenance is completed. 

ASSESSMENT CRITERION 2 
2. Breakdowns are recorded and reported. 

ASSESSMENT CRITERION 3 
3. Blockages are noted and corrective action is explained and demonstrated. 

SPECIFIC OUTCOME 4 
Complete reports in accordance with work policies and procedures 

ASSESSMENT CRITERIA
 

ASSESSMENT CRITERION 1 
1. Work tasks are completed. 

ASSESSMENT CRITERION 2 
2. Reports are complete and handed in to relevant person. 


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 
    Learners should have a knowledge and understanding of:
  • Relevant Legislation: OHS Act, National Water Act, sludge guidelines
  • Alternative sludge thickeners (diffused, air flotation, centrifuge, gravity thickener)
  • Alternative sludge dewatering devices (belt press, centrifuge, drying beds, filter press and sludge lagoons)
  • Health hazards associated with sludge
  • Chemical dosing techniques for sludge dewatering
  • Alternative ways of disposing of sludge
  • The dangers of working in hot and humid conditions
  • The process of operating a drying bed
  • The process of operating a centrifuge
  • The process of operating a belt press 


  • 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 corrective action is explained.
  • Problems are identified and corrective action is explained.
  • Blockages are noted and corrective action is explained and demonstrated. 

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

    Assessment criteria:
  • None. 

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

    Assessment criteria:
  • Work tasks are completed. 

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

    Assessment criteria:
  • Problems are identified and corrective action is explained.
  • Problems are identified and corrective action is explained.
  • Blockages are noted and corrective action is explained and demonstrated. 

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

    Assessment criteria:
  • Problems are identified and corrective action is explained.
  • Problems are identified and corrective action is explained.
  • Sludge is disposed of in accordance with sludge guidelines and the importance of doing this is explained.
  • Breakdowns are recorded and reported.
  • Blockages are noted and corrective action is explained and demonstrated.
  • Reports are complete and handed in to relevant person. 

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

    Assessment criteria:
  • Sludge is disposed of in accordance with sludge guidelines and the importance of doing this is explained. 

  • 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:
  • Sludge is disposed of in accordance with sludge guidelines and the importance of doing this is explained. 

  • UNIT STANDARD NOTES 
    This unit standard has been replaced by unit standard 255979, which is "Thicken and dewater sludge", Level 4, 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 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
    Product sample reports 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Elective  22673   National Certificate: Wastewater Process Operations  Level 2  NQF Level 02  Passed the End Date -
    Status was "Reregistered" 
    2007-11-28  Was EWSETA until Last Date for Achievement 


    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.
     
    NONE 



    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.