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ATTACHMENTS Paper

 

General Meeting

 

Wednesday 9 April 2014

 

Roma Administration Centre

 

NOTICE OF MEETING

 

Date: 9 April 2014

 

Mayor:                                                   Councillor R S Loughnan

 

Deputy Mayor:                                        Councillor W S Wason

Councillors:                                            Councillor J L Chambers

                                                              Councillor R J Denton

                                                              Councillor P J Flynn

                                                              Councillor W M Newman

                                                              Councillor C J O’Neil

                                                              Councillor M L Price

                                                              Councillor D J Schefe

 

Chief Executive Officer:                          Ms Julie Reitano

 

Senior Management:                               Mr Cameron Castles (Director Infrastructure Services)

                                                              Mr Rob Hayward (Director Development, Facilities & Environmental Services)

                                                              Ms Sharon Frank (Director Corporate, Community & Commercial Services)

 

Officers:                                                 Ms Jane Frith (Coordinator Corporate Communications)

 

Please find attached agenda for the General Meeting to be held at the Roma Administration Centre on April 9, 2014 at 9.00am.

Julie Reitano

Chief Executive Officer

 


Maranoa Regional Council

    

General Meeting -  9 April 2014

TABLE OF CONTENTS

Item       Subject

No

  

Reports

 

L.1         Maranoa Water Supply - pH Correction

              Attachment :           W14019 - Water Supply Chlorination - pH Correction................ 2  

 


Attachment 1

W14019 - Water Supply Chlorination - pH Correction

 

 

 

 

 

 

 

 

MARANOA WATER SUPPLY

 

CHLORINE DISINFECTION

 

Contract 14019

 

pH Correction

 

 

 

Report

 

24 March 2014

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Maranoa Regional Council
INFRASTRUCTURE OFFICE

1 Cartwright Street Roma QLD 4455
Postal Address:
P.O Box 42 MITCHELL QLD 4465

 

This document shall remain the property of Maranoa Regional Council.  Unauthorised use of this document in any form is prohibited.

 

Document Control

Revision

Author

Reviewer

Approved for Issue

Name

Signature

Date

A

P. Green

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

CONTENTS

 

1            INTRODUCTION.. 3

2            Ph Correction Dosing.. 3

2.1        Chlorination Equipment 3

2.2        Combined Equipment 3

3            PRICING OVERVIEW... 4

4            CONCLUSION.. 5

5            RECOMMENDATION.. 5

 


Attachment 1

W14019 - Water Supply Chlorination - pH Correction

 

1    INTRODUCTION

 

Maranoa Regional Council awarded a Contract to Akwa-Worx Pty Ltd based on tender submissions for the supply, installation and commissioning of Chlorine Disinfection Dosing systems at up to 15 sites in towns in the region centred around Roma.

 

Chlorine disinfection effectiveness is lessened should the water being treated have a high pH, resulting in additional chlorine being used to provide the required treatment. A high pH is present in several of the water supplies planned for disinfection as part of this Contract. In preparation for this Contract, the buildings housing the chlorine equipment were designed with an additional room for the dosing of pH correction equipment at a later date. This equipment was planned to be included in a future budget.

 

Akwa-Worx have provided a proposal, suggesting that there are several savings that can be achieved, if we were to install PH correction dosing concurrently with the chlorine dosing equipment.

 

2    Ph Correction Dosing

 

2.1     Chlorination Equipment

 

The chlorination equipment generally consists of:

·          A Wallace & Tiernan SFC Chlorine Analyser

·          Flowmeter where flow varies

·          Chlorine sensor

·          Chlorine Dosing pump

 

The sensor detects the chlorine level and provides a signal to the analyser. The analyser then provides a signal to the dosing pump, modifies the signal if required for flow variation, and the pump then doses the required amount of chlorine in to the water.

 

A pH correction system (acid dosing) consists of a similar set of equipment.

 

2.2     Combined Equipment

 

To simplify the addition of pH correction to each site. A basic process overview follows;

 

If the Wallace & Tiernan SFC series chlorine analysers were changed for Wallace & Tiernan MFC series multi-channel unit, the multi-channel controller can be programmed to act as a 2 channel instrument capable of controlling an additional pump to provide one way pH correction (i.e. acid dosing to lower pH). The system would be configured with two wet cells, one for pH and one for chlorine.

 

The first function will be run from a VariaSens wet cell with a pH probe running a on a single feedback closed loop control. This operating mode controls the desired measured variable according to the provided set point. This will directly control the acid pump for pH correction.

 

The second function will use a Depolox 5 free chlorine wet cell in conjunction with a dual input analogue card (water meter input) to allow full combi control (compound loop) of the chlorine. The combi-control is a combination of the ratio control with additional single feedback closed-loop control to correct control deviations. This will directly control the chlorination systems.

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3    PRICING OVERVIEW

 

To provide a stand-alone pH correction package, to be installed independently of the chlorination systems on a per site basis;

 

·          1 x Wallace & Tiernan SFC series controller, complete with wet cell and pH probe - $7,538.00 plus GST

·          Prominent Delta series dosing pump to provide acid dosing (sizing to be confirmed prior to works commencing) - $4,192.00 plus GST

·          500 litre translucent PE Dosing tank c/w fabricated UPVC containment bund - $1,911.00 plus GST

·          PC sum for dosing pipe work and containment conduit required for installation - $975.00 plus GST

·          Labour for installation, including site mobilisation, demobilisation, trenching for dosing pipe work, backfill, and commissioning - $12,535.00 plus GST

 

Total - $28,126.00 plus GST per site

 

To incorporate the pH correction packages in conjunction with the chlorination system installation on a per site basis;

 

·        Price difference to upgrade to the MFC controller complete with two wet cells, pH probe, and chlorine probe - $4,285.00 plus GST

·        Prominent Delta series dosing pump to provide acid dosing (sizing to be confirmed prior to works commencing) - $4,192.00 plus GST

·        500 litre translucent PE Dosing tank c/w fabricated UPVC containment bund - $1,911.00 plus GST

·        PC sum for dosing pipe work and containment conduit required for installation - $975.00 plus GST

·        Additional labour to complete installation at time of works - $1,536.00 plus GST

 

Total - $12,899.00 plus GST per site

 

 

This represents a potential saving of $15,227.00 plus GST per site, amounting to a total of $121,816.00 plus GST over the 8 sites, for an outlay of $103,192.00 plus GST.

 

 

4    CONCLUSION

 

To ensure that Maranoa Regional Council provide the most effective disinfection to the water supplies, it is essential that pH correction is also incorporated into the water treatment process. This provides more effective disinfection with minimal use of chlorine, resulting in ongoing operational savings.

 

For an additional expenditure of $103,192.00 (12% 0f the contract value), savings of $121,816.00 can be achieved.

 

 

5    RECOMMENDATION

 

It is recommended that Maranoa Regional Council:

·    Award a Variation to Contract 14019 - Akwa-Worx Pty Ltd – Maranoa Water Supply – Chlorine Disinfection, for the amount of $103,192.00 (excl. GST) for the addition of supply, installation and commissioning of PH correction dosing equipment.