Assessor Resource

NWPTRT052
Operate and control hypochlorite disinfection processes

Assessment tool

Version 1.0
Issue Date: April 2024


This unit describes the skills required to monitor and operate hypochlorite disinfection systems and report on process quality control. This includes the skills required to working safely with sodium hypochlorite solutions and calcium hypochlorite solids, including their safe handling, transport and storage and implementation of emergency response procedures.

This unit applies to those working as operational staff with specific responsibility for hypochlorite disinfection systems in water and wastewater treatment plants.

The skills and knowledge described in this unit must be applied within the legislative, regulatory and policy environment in which they are carried out. Organisational policies and procedures must be consulted and adhered to, particularly those related to WHS and handling of dangerous goods.

Those undertaking this unit would work under supervision, while performing routine tasks, in a range of familiar contexts.

No licensing, legislative or certification requirements apply to unit at the time of publication.

You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)


Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

ELEMENTS

PERFORMANCE CRITERIA

Elements describe the essential outcomes

Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold italicised text is used, further information is detailed in the range of conditions section.

1. Plan and prepare for work

1.1 Determine work requirements from job specification and plans.

1.2 Select and check equipment and hypochlorite supplies to meet safety requirements of task and site.

1.3 Select, fit and use personal protective equipment.

1.4 Handle and store hypochlorite chemicals to maximise shelf life and reduce loss of available chlorine.

1.5 Conduct the percentage available chlorine test.

2. Monitor process performance

2.1 Monitor hypochlorite disinfection processes according to agreed schedule and procedures.

2.2 Collect samples and conduct process tests.

2.3 Make process adjustments as required to maintain effectiveness of hypochlorite disinfection.

3. Apply chemical dosing

3.1 Prepare and apply hypochlorite chemicals.

3.2 Control hypochlorite dosing to maintain required residual.

4. Complete documentation

4.1 Maintain information relating to hypochlorite supply and usage.

4.2 Collect and record process data.

4.3 Report observations outside defined parameters for further action.

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

applying policies, standard operating procedures and regulatory standards

performing work-related calculations

identifying and responding to process faults and control system faults

identifying hazards

performing hypochlorite tests and chlorine residual sampling and testing

interpreting safety data sheets (SDS)

monitoring, operating and reporting on hypochlorite disinfection systems

selecting and using appropriate tools and equipment, including personal protective equipment

collecting and reporting process data

preparing and applying hypochlorite dosing safely

performing process calculations, including at least one of:

feed rate

dosage

Ct

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.

properties and chemistry of hypochlorite chemicals

effects of pH, time, temperature, UV exposure and impurities on hypochlorite breakdown

microbiological guidelines

reactions with water to produce hypochlorous acid/hypochlorite ion

impact of pH

chlorine demands, including:

ammonia

natural organic matter (NOM)

turbidity

iron, manganese and nitrite

disinfection by-products (DBP)

breakpoint

contact time

hypochlorite dosing system layout for sodium hypochlorite and/or calcium hypochlorite dosing systems

hazardous substances handling

risk factors and potential hazards associated with hypo chlorination

work-related hypochlorite calculations

hypochlorite dosing processes

automatic feed rate control systems

SDS

Competency should be assessed in an actual workplace or in a simulated environment, with access to equipment and infrastructure appropriate to the outcome. Competency should be demonstrated over time to ensure the candidate is assessed across a variety of situations.

Some components of this unit require assessment in a workplace environment therefore the unit is not suitable for fully external or electronic based assessment.

Assessors must satisfy the NVR/AQTF mandatory competency requirements for assessors.

Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)

Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

ELEMENTS

PERFORMANCE CRITERIA

Elements describe the essential outcomes

Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold italicised text is used, further information is detailed in the range of conditions section.

1. Plan and prepare for work

1.1 Determine work requirements from job specification and plans.

1.2 Select and check equipment and hypochlorite supplies to meet safety requirements of task and site.

1.3 Select, fit and use personal protective equipment.

1.4 Handle and store hypochlorite chemicals to maximise shelf life and reduce loss of available chlorine.

1.5 Conduct the percentage available chlorine test.

2. Monitor process performance

2.1 Monitor hypochlorite disinfection processes according to agreed schedule and procedures.

2.2 Collect samples and conduct process tests.

2.3 Make process adjustments as required to maintain effectiveness of hypochlorite disinfection.

3. Apply chemical dosing

3.1 Prepare and apply hypochlorite chemicals.

3.2 Control hypochlorite dosing to maintain required residual.

4. Complete documentation

4.1 Maintain information relating to hypochlorite supply and usage.

4.2 Collect and record process data.

4.3 Report observations outside defined parameters for further action.

Processes include:

sodium hypochlorite solution

sodium hypochlorite

Technologies include:

calcium hypochlorite granules

calcium hypochlorite tablets

Dosing procedures include:

chlorinator shutdown, start up and isolation

purging operations

leak testing

dosing pump checks

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

applying policies, standard operating procedures and regulatory standards

performing work-related calculations

identifying and responding to process faults and control system faults

identifying hazards

performing hypochlorite tests and chlorine residual sampling and testing

interpreting safety data sheets (SDS)

monitoring, operating and reporting on hypochlorite disinfection systems

selecting and using appropriate tools and equipment, including personal protective equipment

collecting and reporting process data

preparing and applying hypochlorite dosing safely

performing process calculations, including at least one of:

feed rate

dosage

Ct

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.

properties and chemistry of hypochlorite chemicals

effects of pH, time, temperature, UV exposure and impurities on hypochlorite breakdown

microbiological guidelines

reactions with water to produce hypochlorous acid/hypochlorite ion

impact of pH

chlorine demands, including:

ammonia

natural organic matter (NOM)

turbidity

iron, manganese and nitrite

disinfection by-products (DBP)

breakpoint

contact time

hypochlorite dosing system layout for sodium hypochlorite and/or calcium hypochlorite dosing systems

hazardous substances handling

risk factors and potential hazards associated with hypo chlorination

work-related hypochlorite calculations

hypochlorite dosing processes

automatic feed rate control systems

SDS

Competency should be assessed in an actual workplace or in a simulated environment, with access to equipment and infrastructure appropriate to the outcome. Competency should be demonstrated over time to ensure the candidate is assessed across a variety of situations.

Some components of this unit require assessment in a workplace environment therefore the unit is not suitable for fully external or electronic based assessment.

Assessors must satisfy the NVR/AQTF mandatory competency requirements for assessors.
Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
Determine work requirements from job specification and plans. 
Select and check equipment and hypochlorite supplies to meet safety requirements of task and site. 
Select, fit and use personal protective equipment. 
Handle and store hypochlorite chemicals to maximise shelf life and reduce loss of available chlorine. 
Conduct the percentage available chlorine test. 
Monitor hypochlorite disinfection processes according to agreed schedule and procedures. 
Collect samples and conduct process tests. 
Make process adjustments as required to maintain effectiveness of hypochlorite disinfection. 
Prepare and apply hypochlorite chemicals. 
Control hypochlorite dosing to maintain required residual. 
Maintain information relating to hypochlorite supply and usage. 
Collect and record process data. 
Report observations outside defined parameters for further action. 
Determine work requirements from job specification and plans. 
Select and check equipment and hypochlorite supplies to meet safety requirements of task and site. 
Select, fit and use personal protective equipment. 
Handle and store hypochlorite chemicals to maximise shelf life and reduce loss of available chlorine. 
Conduct the percentage available chlorine test. 
Monitor hypochlorite disinfection processes according to agreed schedule and procedures. 
Collect samples and conduct process tests. 
Make process adjustments as required to maintain effectiveness of hypochlorite disinfection. 
Prepare and apply hypochlorite chemicals. 
Control hypochlorite dosing to maintain required residual. 
Maintain information relating to hypochlorite supply and usage. 
Collect and record process data. 
Report observations outside defined parameters for further action. 

Forms

Assessment Cover Sheet

NWPTRT052 - Operate and control hypochlorite disinfection processes
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

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Assessor name:

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Assessment Record Sheet

NWPTRT052 - Operate and control hypochlorite disinfection processes

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

Assessor name:

Signature:

Date:

Student signature:

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