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Elements and Performance Criteria

Performance Evidence

Evidence required to demonstrate competence must satisfy all of the requirements of the elements and performance criteria. If not otherwise specified the candidate must demonstrate evidence of performance of the following on at least one occasion.

conducting investigations and reporting on operational and control system problems

coordinating sampling and testing including at least one of:

flocculation growth

residual inorganic compounds

assessing quality of treatment chemicals by conducting a full range of jar tests

performing mathematical calculations to provide data for the analysis and development of options and solutions

investigating chemical dosing

interpreting a range of complex and technical documents, including at least one of:

regulatory, legislative, licensing and organisational requirements

codes and standards

organisational policies

articulating complex ideas

analysing and evaluating reports and reference materials

analysing problems and recommending appropriate remedial solutions

identifying and responding to risks and hazards

identifying opportunities for improved water treatment

reviewing existing process performance with reference to historical data, differences in raw water quality and plant configuration including at least one of:

presence of algae

identifying data deficiencies and plan additional data collection through appropriate sampling and testing

assessing fault reports and investigating the current operational status of plant components

investigating current and potential chemical addition practices

planning trials to test the performance of the determined optimisation options and compiling recommendation reports

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.

the role of chemical addition in water treatment

the principles of chemical addition, including enhanced coagulation

chemical addition plant and equipment and system layout including:

mixing equipment

streaming current detector

chemical injection equipment

turbidity meter

particle counter

chemical concepts and reactions relevant to chemical addition processes, including pH and alkalinity

range and characteristics of chemicals used in chemical addition processes including:

polyaluminium chloride (PACL)

aluminium sulphate

aluminium chlorohydrate (ACH)

ferric chloride

ferric sulphate

functions of various chemicals in chemical addition processes

factors influencing the effectiveness of chemicals in chemical addition processes

factors affecting the selection of chemicals in chemical addition processes

range of appropriate measuring and testing procedures

investigation procedures

risk management principles

locating chemical dosing points including at least one of:

mixing or reaction detention times

type of mixer or impeller

customer expectations and requirements

dosing pump capacity and calibration chart including:

detention times

mixing intensity for flash or rapid mixing and flocculation