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Greytown Wastewater Treatment Plant - Operation &
Maintenance Manual
South Wairarapa District Council
August 2014 – Working Draft
Greytown Wastewater Treatment Plant - Operation & Maintenance Manual Working Draft August 2014
AWT WATER, A MEMBER OF THE MOTT MACDONALD GROUP. LEVEL 1, 23 UNION STREET, AUCKLAND 1010
M:\Website management\Greytown WWPT\Application documents\12503_App7a_MM_GWWTP Operations and Maintenance Manual.docx
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QUALITY RECORD SHEET
Document Greytown Wastewater Treatment Plant - Operation & Maintenance Manual - Working Draft
Reference P:\Auckland\NZL\Projects\1250_Combined_Scheme_Review\500 Deliverables\510 Reports\Greytown Resource Consent Application\GWWTP AEE Final\Appendix 7a_MM_GWWTP Operations and Maintenance Manual.docx
Date August 2014
DOCUMENT CONTROL
The following organisation(s) shall receive a electronic copy of this report on release:
South Wairarapa District Council
Action Name Title, Company Signed Date
Originated by Emmanuel Rochais Process Engineer, AWT Water Ltd 5/3/2014
Reviewed by Sarah Sunich Senior Environmental Scientist, AWT Water Ltd
6/08/2014
Approved by Jason Ewert Technical Director, AWT Water Ltd
REVISION HISTORY
Version Prepared by Description Date
Working Draft AWT Operations and Maintenance Manual for the Treatment Plant 6/08/2014
DISCLAIMER
This document is issued for the party which commissioned it and for specific purposes connected with the above-captioned project only. It should not be relied upon by any other party or used for any other purpose.
We accept no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties.
This document contains confidential information and proprietary intellectual property. It should not be shown to other parties without consent from us and from the party which commissioned it.
Greytown Wastewater Treatment Plant - Operation & Maintenance Manual Working Draft August 2014
AWT WATER, A MEMBER OF THE MOTT MACDONALD GROUP. LEVEL 1, 23 UNION STREET, AUCKLAND 1010
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TABLE OF CONTENTS
EXECUTIVE SUMMARY ............................................................................................................................................................... V
1 INTRODUCTION .......................................................................................................................................................... 1
1.1 Purpose of the Manual ............................................................................................................................................... 1
1.2 Consent Requirements ............................................................................................................................................... 1
2 PLANT OVERVIEW ..................................................................................................................................................... 1
2.1 Plant Description ........................................................................................................................................................ 1
2.2 Influent and Effluent quality ........................................................................................................................................ 1
2.3 Plant Drawings and Photos ........................................................................................................................................ 1
2.4 Plant Process Items.................................................................................................................................................... 1
3 PLANT OPERATING PROCEDURES ......................................................................................................................... 1
3.1 Process Units ............................................................................................................................................................. 1
3.1.1 Inlet Screen ................................................................................................................................................................ 1
3.1.2 Primary (Facultative) pond ......................................................................................................................................... 1
3.1.3 Tertiary (Maturation) pond .......................................................................................................................................... 1
3.1.4 UV treatment .............................................................................................................................................................. 1
3.1.5 Monitoring Equipment ................................................................................................................................................. 2
3.1.6 Stream Discharge ....................................................................................................................................................... 2
3.1.7 Stream Discharge ....................................................................................................................................................... 2
3.1.8 Stage 1 Land Application ............................................................................................................................................ 2
3.2 Key Performance Indicators ....................................................................................................................................... 2
3.3 Alarm Conditions ........................................................................................................................................................ 2
3.4 Odour Management.................................................................................................................................................... 2
3.5 Emergency Operation Procedures ............................................................................................................................. 2
3.6 Pond Desludging Procedures ..................................................................................................................................... 2
4 OPERATIONAL AND COMPLIANCE MONITORING.................................................................................................. 2
4.1 Process Monitoring ..................................................................................................................................................... 2
4.1.1 Inflow Monitoring ........................................................................................................................................................ 2
4.1.2 Influent Monitoring ...................................................................................................................................................... 2
4.1.3 Weather Climate Data Collection ............................................................................................................................... 3
4.1.4 Reporting .................................................................................................................................................................... 3
4.2 Effluent Discharge monitoring .................................................................................................................................... 3
4.2.1 Outlet Flow Monitoring ................................................................................................................................................ 3
4.2.2 Quality Monitoring....................................................................................................................................................... 3
4.3 Site Inspection ............................................................................................................................................................ 3
4.3.1 Regular site walkovers ............................................................................................................................................... 3
4.3.2 Inspection after Heavy Rain ....................................................................................................................................... 3
4.3.3 Odour Walkovers ........................................................................................................................................................ 3
Greytown Wastewater Treatment Plant - Operation & Maintenance Manual Working Draft August 2014
AWT WATER, A MEMBER OF THE MOTT MACDONALD GROUP. LEVEL 1, 23 UNION STREET, AUCKLAND 1010
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4.4 Complaints Register ................................................................................................................................................... 3
4.5 Environmental Monitoring ........................................................................................................................................... 3
4.6 Reporting .................................................................................................................................................................... 4
4.6.1 Quarterly Reporting .................................................................................................................................................... 4
4.6.2 Annual Reporting ........................................................................................................................................................ 4
4.6.3 Notification of an Exceedence of Consent Conditions ................................................................................................ 4
5 PLANT CONDITION INSPECTIONS AND MAINTENANCE ....................................................................................... 4
5.1 Inspection and Maintenance Procedures ................................................................................................................... 4
5.1.1 Maintenance and repair of mechanical equipment ..................................................................................................... 4
5.1.2 Maintenance and Repair of Pond Structures and Grounds ........................................................................................ 4
5.2 Recording and Reporting of Inspection and Maintenance .......................................................................................... 4
6 CONTINGENCY MEASURES AND TROUBLESHOOTING GUIDE ........................................................................... 4
6.1 Excess Flow ............................................................................................................................................................... 4
6.2 Pump Failure .............................................................................................................................................................. 4
6.3 Pipeline Failure ........................................................................................................................................................... 5
6.4 Damage to Information Electronics ............................................................................................................................ 5
6.5 Operator Error ............................................................................................................................................................ 5
6.6 Power Failure ............................................................................................................................................................. 5
6.7 Storage Pond Capacity Alarm .................................................................................................................................... 5
6.8 Preventative Maintenance .......................................................................................................................................... 5
7 ROLES AND RESPONSIBILITIES .............................................................................................................................. 5
7.1 Management Structure ............................................................................................................................................... 5
7.2 Contacts ..................................................................................................................................................................... 5
7.3 Staff Training .............................................................................................................................................................. 5
7.4 Operator Procedure and Protective Clothing .............................................................................................................. 5
8 OPERATION AND MAINTENANCE MANUAL REVIEW PROCEDURE ..................................................................... 5
9 RECOMMENDED REFERENCES ............................................................................................................................... 5
APPENDICES
APPENDIX 1 – RESOURCE CONSENT
APPENDIX 2 – DRAWINGS AND P&ID'S
APPENDIX 3 – INSPECTION AND MAINTENANCE SCHEDULE
APPENDIX 4 – INSPECTION AND MAINTENANCE LOG
LIST OF FIGURES
No table of figures entries found.
Greytown Wastewater Treatment Plant - Operation & Maintenance Manual Working Draft August 2014
AWT WATER, A MEMBER OF THE MOTT MACDONALD GROUP. LEVEL 1, 23 UNION STREET, AUCKLAND 1010
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LIST OF TABLES
No table of figures entries found.
Greytown Wastewater Treatment Plant - Operation & Maintenance Manual Working Draft August 2014
AWT WATER, A MEMBER OF THE MOTT MACDONALD GROUP. LEVEL 1, 23 UNION STREET, AUCKLAND 1010
M:\Website management\Greytown WWPT\Application documents\12503_App7a_MM_GWWTP Operations and Maintenance Manual.docx
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EXECUTIVE SUMMARY
Greytown Wastewater Treatment Plant - Operation & Maintenance Manual Working Draft August 2014
AWT WATER, A MEMBER OF THE MOTT MACDONALD GROUP. LEVEL 1, 23 UNION STREET, AUCKLAND 1010
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1 INTRODUCTION
Quick description of catchment, plant location…
1.1 Purpose of the Manual
1.2 Consent Requirements
2 PLANT OVERVIEW
2.1 Plant Description
Overall description of process and any design criteria information.
2.2 Influent and Effluent quality
Influent data, effluent consent limits and effluent data
2.3 Plant Drawings and Photos
2.4 Plant Process Items
List of plant items and mechanical equipment
3 PLANT OPERATING PROCEDURES
3.1 Process Units
3.1.1 Inlet Screen
On commissioning of the proposed inlet screen, include detail on how it is controlled, and operated.
3.1.2 Primary (Facultative) pond
What the facultative pond does and diffused coarse air bubble aeration system operation, operating levels,
procedures to manage peak flows and prevent unauthorised discharges.
3.1.3 Tertiary (Maturation) pond
What the tertiary pond does, and final two cells, operating levels, procedures to manage peak flows and prevent
unauthorised discharges.
3.1.4 UV treatment
On commissioning of the proposed UV treatment plant, include detail on how it is controlled, and operated.
Greytown Wastewater Treatment Plant - Operation & Maintenance Manual Working Draft August 2014
AWT WATER, A MEMBER OF THE MOTT MACDONALD GROUP. LEVEL 1, 23 UNION STREET, AUCKLAND 1010
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3.1.5 Monitoring Equipment
Influent and outlet flow meters; pond level sensors, pH and DO probes.
3.1.6 Stream Discharge
Brief description of the discharge outlet pipe and the Papawai Stream
Description of how the discharge process operates.
3.1.7 Stream Discharge
3.1.8 Stage 1 Land Application
On commissioning of the proposed Stage 1 Land Application Scheme, include detail on how it is controlled e.g. type
of equipment, irrigation pumps, filtration system etc.. and how it is to be operated.
3.2 Key Performance Indicators
3.3 Alarm Conditions
If any alarms can be triggered
3.4 Odour Management
This section will reference the Odour Management Plan and is about the operating procedures for ensuring odour is
minimised.
3.5 Emergency Operation Procedures
Contingency meuasres in the event of system malfunctions or breakdowns (including power outage)
3.6 Pond Desludging Procedures
When and how to remove sludge settled in ponds and how to treat this sludge
4 OPERATIONAL AND COMPLIANCE MONITORING
4.1 Process Monitoring
Mostly influent testing and sludge level in ponds.
4.1.1 Inflow Monitoring
Regular checking of the flow meter and data, calibration scheduling and procedures.
4.1.2 Influent Monitoring
When and where to test, type of sample (grab, composite), what to do with the sample. Parameters to be analysed.
Greytown Wastewater Treatment Plant - Operation & Maintenance Manual Working Draft August 2014
AWT WATER, A MEMBER OF THE MOTT MACDONALD GROUP. LEVEL 1, 23 UNION STREET, AUCKLAND 1010
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4.1.3 Weather Climate Data Collection
A method for ascertaining the climate conditions.
4.1.4 Reporting
District Council reporting requirements (data, frequency…)
4.2 Effluent Discharge monitoring
4.2.1 Outlet Flow Monitoring
Regular checking of the flow meter and data, calibration scheduling and procedures, conversion to data into daily
volumes for compliance reporting purposes and frequency of data review.
4.2.2 Quality Monitoring
Monitoring effluent quality from the UV disinfection unit as per the schedule in the consent. Procedures for collecting
samples assuming the operators will be undertaking this sampling, parameters to be monitored and frequency to be
monitored. Procedure for documenting results.
4.3 Site Inspection
Include a schedule of regular and irregular site inspection requirements for the river discharge and land treatment
components.
4.3.1 Regular site walkovers
4.3.2 Inspection after Heavy Rain
4.3.3 Odour Walkovers
Reference to procedures set out in the Odour Management Plan for regular site walkover procedures and responding
to odour incidences.
4.4 Complaints Register
This will likely refer to a centralised complaints register that will be used for all aspects of the scheme operation
including odour complaints and complaints regarding the effluent discharge. Procedures for recording of and
responding to complaints
4.5 Environmental Monitoring
This section will reference a separate Environmental Monitoring Programme that will provide details on the following:
Stream and water quality monitoring – Location of river sampling sites, methods to be used to monitor and
reporting
Greytown Wastewater Treatment Plant - Operation & Maintenance Manual Working Draft August 2014
AWT WATER, A MEMBER OF THE MOTT MACDONALD GROUP. LEVEL 1, 23 UNION STREET, AUCKLAND 1010
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4.6 Reporting
4.6.1 Quarterly Reporting
4.6.2 Annual Reporting
4.6.3 Notification of an Exceedence of Consent Conditions
5 PLANT CONDITION INSPECTIONS AND MAINTENANCE
5.1 Inspection and Maintenance Procedures
Operation checks and preventive maintenance checklist
5.1.1 Maintenance and repair of mechanical equipment
UV and pumps
5.1.2 Maintenance and Repair of Pond Structures and Grounds
Wave bands, outlet structures, discharge channel, embankments.
5.2 Recording and Reporting of Inspection and Maintenance
6 CONTINGENCY MEASURES AND TROUBLESHOOTING GUIDE
6.1 Excess Flow
6.2 Pump Failure
Only relevant once UV treatment plant and land treatment scheme commissioned.
Greytown Wastewater Treatment Plant - Operation & Maintenance Manual Working Draft August 2014
AWT WATER, A MEMBER OF THE MOTT MACDONALD GROUP. LEVEL 1, 23 UNION STREET, AUCKLAND 1010
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6.3 Pipeline Failure
6.4 Damage to Information Electronics
6.5 Operator Error
6.6 Power Failure
6.7 Storage Pond Capacity Alarm
6.8 Preventative Maintenance
7 ROLES AND RESPONSIBILITIES
7.1 Management Structure
7.2 Contacts
7.3 Staff Training
7.4 Operator Procedure and Protective Clothing
8 OPERATION AND MAINTENANCE MANUAL REVIEW PROCEDURE
9 RECOMMENDED REFERENCES
APPENDIX 1
RESOURCE CONSENT
APPENDIX 2
DRAWINGS AND P&ID'S
APPENDIX 3
INSPECTION AND MAINTENANCE SCHEDULE
APPENDIX 4
INSPECTION AND MAINTENANCE LOG