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Elements and Performance Criteria

1. Plan and prepare for work
   • Determine work requirements from job specifications and plans.
   • Select and check equipment to meet safety requirements of task and site.
   • Select, fit and use personal protective equipment.
2. Operate and control process
   • Carry out routine inspection on assets.
   • Collect process samples.
   • Carry out routine tests.
   • Prepare samples for laboratory testing.
   • Identify and report process faults and operational condition of assets.
   • Carry out basic process adjustments to enhance process performance.
   • Monitor processes to maintain parameters of operation.
3. Complete documentation
   • Collect, record and complete process data.
   • Identify data that falls outside normal parameters and report for further action.
4. Plan and prepare for work
   • Determine work requirements from job specifications and plans.
   • Select and check equipment to meet safety requirements of task and site.
   • Select, fit and use personal protective equipment.
5. Operate and control process
   • Carry out routine inspection on assets.
   • Collect process samples.
   • Carry out routine tests.
   • Prepare samples for laboratory testing.
   • Identify and report process faults and operational condition of assets.
   • Carry out basic process adjustments to enhance process performance.
   • Monitor processes to maintain parameters of operation.
6. Complete documentation
   • Collect, record and complete process data.
   • Identify data that falls outside normal parameters and report for further action.

Range Statement

Current digestion processes include:

anaerobic mesophilic aerobic thermophilic mesophilic

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Performance Evidence

Evidence required to demonstrate competence must satisfy all of the requirements of the elements and performance criteria. The candidate must be assessed operating at least one of the processes listed in Range of Conditions. If not otherwise specified the candidate must demonstrate evidence of performance of the following on least one occasion.

planning and conducting routine inspections

completing logs

taking samples and performing basic tests, including at least one of:

pH

DO

Redox

total solids

volatile solids (aerobic)

gas composition

total solids

volatile solids

volatile acids

alkalinity (anaerobic)

collecting samples for laboratory testing

applying basic process formulae, including at least one of:

solids loading

volatile acids to alkalinity ratio

solids retention time

making basic process adjustments according to instructions, including at least one of:

feed rate

air and oxygen feed rate

mixing

pH (aerobic)

feed rate

sludge withdrawal

mixing

sludge feed rate

pH (anaerobic)

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Knowledge Evidence

Evidence required to demonstrate competence must satisfy all of the requirements of the elements and performance criteria. If not otherwise specified the depth of knowledge demonstrated must be appropriate to the job context of the candidate.

digestion process principles

types of hazards related to explosives, hydrogen sulphide, carbon dioxide

differences between aerobic and anaerobic biological processes

chemical dosing processes

chemicals used for pH control, odour control, nutrient addition

flow measurement

risk factors and potential hazards relating to anaerobic bioreactor systems

chemical and biological principles that form the basis of digestion

hydraulic detention times

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