24958 Operate Coagulation and Flocculation Processes in Water Treatment

NZQA Expiring unit standard 24958 version 2 Page 1 of 4

Title Operate coagulation and flocculation processes in water treatment

Level 4 Credits 16

Purpose People credited with this unit standard are able to: monitor and adjust coagulation and flocculation process inputs; carry out preventive maintenance procedures and repairs on coagulation and flocculation equipment; and describe the storage, handling, and preparation of chemicals, and chemical dosing systems used in coagulation and flocculation processes, in water treatment.

Classification Water Industry > Water Treatment

Available grade Achieved

Explanatory notes

1 Reference Legislation relevant to this unit standard includes but is not limited to the Health and Safety in Employment Act 1992, and the Hazardous Substances and New Organisms (HSNO) Act 1996.

2 Definition Organisational procedures – instructions to staff and procedures which are documented in memo or manual format and are available in the workplace. These procedures include but are not limited to – site specific procedures, laboratory procedures, manufacturers’ specifications, product quality specifications and reference to legislative or regulatory procedures relevant to the industry. s 3 A person is required to have approved handler certificationi ifs handling i substances being transferred under the HSNO Act 1996. Informationd ond approved handler procedures can be obtained from http://www.erma.govt.nzr ar. dad Outcomes and evidence requirements nan ta t g Outcome 1 s s gn it it inri Monitor and adjust coagulation andn flocculationun i processrpi inputs in water treatment. us px Range process inputsi includes i but areex note limited to – pH, flow rate, alkalinity, temperature,h turbidity,h organics, retention time, floc size, dose rate, coagulant and flocculantT Tresidual, solution strengths.

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Evidence requirements

1.1 Testing equipment is calibrated, if required, tests or measurements for monitoring process inputs are carried out, and results are recorded, in accordance with consumer demand, compliance procedures, and organisational procedures.

Range tests – jar, polyelectrolyte dose assessment, volumetric flow, pH, alkalinity.

1.2 Process inputs are adjusted in accordance with results of testing.

1.3 Process history is analysed, trends are identified, and process inputs are adjusted in accordance with organisational procedures.

1.4 Process inputs are adjusted in response to process failure in accordance with organisational procedures.

1.5 Consumables are checked and ordered in accordance with organisational procedures.

Range chemicals, testing reagents and equipment.

Outcome 2

Carry out preventive maintenance procedures on coagulation and flocculation equipment in water treatment.

2.1 Preventive maintenance procedures are carried out, and recorded in accordance with organisational procedures.

2.2 Procedures for maintaining process continuity are carried out in accordance with organisational procedures. s is 2.3 Personal protective equipment is used while carrying i out preventive maintenance in accordance with health and safetyd procedures.rd ar a Outcome 3 d d nan Carry out repairs on coagulation and flocculationtas equipmentt ing water treatment. st gn Evidence requirements it i inri nun irpi 3.1 Repairs are carried uout according p to xprocess and/or equipment failure, and recorded in accordances is with organisationalxe procedures. hi h e 3.2 PersonalT protectiveT equipment is used while carrying out repairs in accordance with health and safety procedures.

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Outcome 4

Describe the storage, handling, and preparation of chemicals, and chemical dosing systems used in coagulation and flocculation processes in water treatment.

4.1 The storage, handling, and preparation of chemicals used in coagulation and flocculation processes are described in terms of the HSNO Act 1996.

4.2 Chemical dosing systems used in coagulation and flocculation processes are described in terms of the components, methods, and points of application.

Range components – chemical pipework, dosing pumps, speed control, stroke control, flow rate, tank of dilutant, instrumentation for automatic control.

Replacement information This unit standard and unit standard 24974 were replaced by unit standard 29984.

This unit standard is expiring. Assessment against the standard must take place by the last date for assessment set out below.

Status information and last date for assessment for superseded versions Process Version Date Last Date for Assessment Registration 1 19 September 2008 31 December 2018 Review 2 16 March 2017 31 December 2018

Consent and Moderation Requirements (CMR) reference 0101 This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do . s is Please note i Providers must be granted consent to assess against standardsd (accredited)d by NZQA, r ar before they can report credits from assessment againsta unitd standards or deliver courses of study leading to that assessment. ndn a ta Industry Training Organisations must be grantedst s consentg to assessg against standards by NZQA before they can register creditst from i assessmentt in iagainstn unit standards. ni n ir ir Providers and Industry Trainingu Organisations, u p whichp have been granted consent and which are assessing against units standardsx mustx engage with the moderation system that applies to those standards.is i e e hTh Requirements for consentT to assess and an outline of the moderation system that applies to this standard are outlined in the Consent and Moderation Requirements (CMR). The CMR also includes useful information about special requirements for organisations wishing

Infrastructure ITO Ó New Zealand Qualifications Authority 2018 SSB Code 101813 NZQA Expiring unit standard 24958 version 2 Page 4 of 4 to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements.

is is d d r ar dad nan ta t s s gng it it inri nun irpi us xpx ishi e e ThT

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