CX10677 Prelim Design EOI Pre-Qualification Requirements Brief

8/2/2019 CX10677 Prelim Design EOI Pre-Qualification Requirements Brief

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LOWERMOLONGLOWATERQUALITYCONTROLCENTRE(LMWQCC)

SOLIDSHANDLINGSYSTEMUPGRADE

P R E L I M I N A R Y D E S I G N

E x p r e s s i o n s o f I n t e r e s tP r e - Q u a l i f i c a t i o n R e q u i r e m e n t s B r i e f

T e n d e r N o . 1 0 8 3 / 1 2

A p r i l 2 0 1 2

ActewAGL DistributionABN 76 670 568 688

GPO Box 366

CANBERRA ACT 2601


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LMWQCCSOLIDS HANDLING SYSTEM UPGRADEPRELIMINARY DESIGN

P r e - Q u a l i f i c a t i o n R e q u i r e m e n t s B r i e f

ActewAGL 2

LMWQCC Solids Handling System Upgrade Page 2 of 13

1 IntroductionOn Saturday 21 April 2012, ActewAGL, on behalf of ACTEW Corporation Ltd, ABN 86 069 381960, (ACTEW)invited Expressions of Interest (EOI) for the preliminary design of aspects of theSolids Handling System Upgrade at the Lower Molonglo Water Quality Control Centre[LMWQCC].

This Expression of Interest (EOI) Pre-qualification Requirements Brief sets out:

an overview of the Project; information regarding the Project to enable prospective Proponents to assess

whether or not they have the capabilities sought by ActewAGL; and the matters to be addressed by prospective Proponents to establish their capability

(ie content and format of the Pre-qualification submission) .

Only Proponents who have:

applied for pre-qualification; and subsequently been pre-qualified (i.e., assessed by ActewAGL in their absolute

discretion as having the capability),

will be invited to submit proposals for the Preliminary Design. The invitation is referred to inthe remainder of this Pre-qualification Requirements Brief as the Request for Proposal for the

concept and preliminary design (RFP)

.

ActewAGL is not required to give reasons for its assessment of the capability of any prospectiveProponent.

Although ActewAGL intends at this time to proceed with the Request for Proposal processdescribed in this Pre-qualification Requirements Brief, it nevertheless reserves the right toamend the process to procure the preliminary design. ActewAGL will not (and will not beliable to) reimburse any respondent to the invitation contained in this Pre-qualificationRequirements Brief or any proponent responding to the RFP for any costs directly or indirectlyincurred in relation to the pre-qualification process or the RFP.


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2 Overview of Project2.1 Lower Molonglo Water Quality Control Centre (LMWQCC)

Current treatment facilities

The existing wastewater treatment plant is located approximately 16 kilometres from the centreof Canberra in the suburb of Holt (ACT). The plant is situated near the confluence of theMolonglo and Murrumbidgee Rivers. LMWQCC is the main wastewater treatment plant forthe ACT. The plant treats wastewater using a combination of physical, chemical and biologicaltreatments with the solids (including sewage sludge, grit, rags and screenings) removed fromthe treatment process and incinerated in two multiple hearth furnace, the sludge is dewateredin centrifuges and the cake fed into the furnaces. The furnaces have been in operation since 1978and ActewAGL is looking to improve furnace and ancillerys performance and improve airemissions. Operation of the furnaces, including emissions, is regulated under Schedule 2 of theEnvironmental Authorisation.

2.2 Project OverviewInitial upgrade investigations have determined that the existing incineration can continue in useup to (and possibly beyond) 2028, however to meet the existing and future air emission licenceconditions, upgrades to the feed, furnace and emission systems are required. The selecteddesign consultant(s) will complete the Preliminary Design under RFT 1083/12 for the following:

1.CFD Modelling of the Incineration process;2.Screenings and Grit systems;

3.Sludge and Feed systems;4.Furnace and Exhaust systems;5.Foul Air system.

Background information for each of the above work packs is found below in Sections 2.3 to 2.7.

The purpose of the preliminary design is to provide clear recommendations with substantiatedsupporting reasons, general arrangement drawings and budgets which allow ActewAGL toproceed with detailed design and construction confident that ACTEWs requirement for theupgrade will be met and that the full scope of the upgrade is well justified.

The scope includes condition and capacity assessment of the existing solids handling system ofLMWQCC.

RFT 1083/12 allows ActewAGL to engage separate consultants for each of the above workpacks. However there may be advantages to engaging a consultant for the preliminary designof some or all work packs. Consultants will have the opportunity to offer ActewAGL adiscount should they be awarded more than one work pack.


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2.3 Proposed CFD Modelling of the Incineration ProcessComputational Fluid Dynamic (CFD) modelling of the existing incineration process is requiredto determine a basis for proposed upgrades to the feed systems, the furnaces and auxiliaryequipment and the emission control systems.

Recommendations regarding positioning and specification of instrumentation on the furnaceand auxiliary equipment is required to enable accurate data capture over a 6 9 month periodfor the CFD modelling.

Once the existing operation has been modelled, numerous simulations will be undertaken todetermine the optimal arrangement and set-up of the incineration process. From this optimalrecommendation the detailed design of the solids handling system will be undertaken.

Some of the modelling outputs required are:

Temperature patterns through the process;

Solid flows through the process;

Gaseous and air flows through the process;

Optimisation of combustion patterns (burners, solid wastes, etc.);

Optimisation of air/fuel usage and ratios;

Predicted emissions through the stack and disbursement patterns;

Optimised balance between fuel and the three waste streams (screenings, grit and sludge).

There will be a requirement that the CFD model can be modified to enable accurate on-linesimulations that will be used to control the daily operation of the incineration process by the

operators and furnace control systems.

The preliminary design will include:

Recommendations relating to location and specification of instrumentation required onthe furnace and auxiliary equipment to enable accurate data collection;

Collection of data over a 9 month period;

Modelling of the current incineration process (CFD modelling)

Carrying out multiple simulations to ascertain the optimal arrangement, flows,combustion patterns and operation of the incineration process;

Simplification of the CFD model to allow it to be implemented into the SCADA system

and used as a real time model so as to automate the incineration operation;

2.4 Screening and Grit System InvestigationsScreenings are the large detritus which is removed from wastewater by fine screens. Itcomprises items such as rags, plastics, nappies, paper, vegetable matter, etc. There is nocommercial or intrinsic value of screenings and they constitute a potential health hazard. Thescreenings are removed on 3mm fine screens, macerated, dewatered and then pumped to thesludge holding tank, which provides some balancing storage before the centrifuges.


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The grit collected at LMWQCC consists of fine sand and soil particles and heavy solidsgenerally between 0.3 and 2mm in size which settles in specially designed tanks. Grit isdewatered on screw classifiers and fed into the top of the furnaces.

Virtually all treatment plants, except for LMWQCC generally dispose of screenings and grit atlandfill sites.

The preliminary design should include a full investigation into the existing grit and screeningsystem capabilities to ascertain what improvements are required to supply the furnaces with aconsistent and reliable fuel source throughout the day.

The preliminary design should also consider the addition of a 4th fine screen to cope withadditional flows due to population growth.

The screenings blending tank is undersized and therefore blending is occurring in the sludge

holding tank. The preliminary design should review capacities throughout screening and gritsystems to provide appropriate handling and sufficient storage for optimal incinerationoperation. Hydraulic modelling of the systems will be required to simulate current and futureloadings through the screenings and grit systems

In addition to the above, there are specific issues with the screenings and grit systems that havebeen highlighted by ActewAGL Treatment Branch (Operations) through a scoping workshop,these will be detailed in the work pack scope, but include:

Lack of metal detection on the screening system, options for metal removal are required;

Poor screening wet well operation, can not remove all solids and it can not be isolated

from the macerator pumps, investigate options; Constant blocking of the screening pumps (discharge side);

Grit is getting past the 3mm fine screens and settling out in the blending tank;

Inability to sustain grit flowing and recirculating whilst the furnace is off-line in order toprevent the grit tanks from blocking up.

2.5 Sludge and Feed System InvestigationsOne of the major contributors to the poor incineration performance is the inconsistency and

variability in composition of the cake fed into the furnace. A detailed investigation into thesludge and feed systems is required to identify improvements required to deliver a consistentmix and feed 24 hours a day.

These investigation will include:

Sludge Dewatering polymer system;

Sludge holding tank and room;

Sludge pumping system;

Centrifuges;

Feed systems.


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Hydraulic modelling will be required to identify limitations in the process and providejustification of the recommendations made by the consultants.

The existing sludge holding tank presents some process issues, there is also no redundancy in

the sludge holding tank. The mixing in the tank is not even and needs to be addressed, as domaintenance access issues.

The mixing of screenings and sludge in the sludge holding tank causes feed issues through thecentrifuges. The preliminary design needs to investigate options for seperating the processroutes for the screenings, grit and the sludge.

There are specific concerns that must also be addressed which the operators have highlighted,these will be detailed in the scope for this work pack, but include:

H2S monitoring in the sludge room;

Emergency truck loading facility needs to be improved; Additional storage requirements.

The options and reccomendations for how to feed the cake, screenings and grit into the furnacesalso need to be included in the preliminary design, for example are the existing screwconveyors the best option or would a pumped system be better suited to delivering a consistentfeed?

The consultant shall provide GA drawings for any recommendations made, along with costestimations for all proposals.

2.6 Furnace and Exhaust System Investigations

The current incineration system at LMWQCC includes a duty/standby (Maintenance)arrangement consisting of a multi hearth furnace (9 hearths), cyclones, afterburners (de-commissioned), a wet scrubber and ash handling system, as well as shaft cooling, exhaustducting and equipment, stack monitoring and the stack itself.

The original design point of the furnaces was for a feed based on 12-18% solid content, which ismuch wetter than the current feed average of 34% solids. As a result instead of the cake drying

in the first 3 hearths of the furnace, then burning in the next 3 hearths, followed by cooling inthe final 3 hearths the cake is burning in the first 2 hearths hence causing the issues withemission compliance.

The exceedences of the current licence conditions are predominantly down to excess CarbonMonoxide, Opacity and NOx. All three conditions need to be addressed in the exhaust system,recommendations and reasonings are required along with layouts and budgets for the requiredworks.

The preliminary design of the furnace and exhaust system will depend upon the results of theCFD model being undertaken, therefore this work pack will not commence until the CFD model

has simulated the optimal configuration determined. However to asist in assertaining


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experience and qualifications to under take the preliminary design work, the consultant shouldconsider the concept design, which included:

Install ammonia injection system (or alternative system) for control of NOx;

Install wet electrostatic precipitator (or alternative system) for removal of particulates; Install regenerative thermal oxidiser (or alternative system) for reduction of carbon

monoxide;

Move the furnace feed points from Hearth #1 to Hearth #3 (with separate feeds forscreenings, cake and grit) to move combustion lower;

Automate excess air flow control to provide greater operating control;

The preliminary design will make recommendations relating to the optimal configurationbased on the CFD modelling, including proposed floor plans identifying if there is sufficientroom in the current layout or if additional buildings will be required.

The preliminary design should make recommendations for energy recovery (heat to power),along with costs associated with all the proposed works. The current system returns waste heatfrom the wet scrubbers back into the biological process (increasing the main biologicaltemperatures by 3C in winter), this energy recovery must be maintained in any new proposal.

In addition to the work described above, several specific issues with this system need to beinvestigated during the preliminary design, as highlighted by the operations team in thescoping workshop, this will be detailed in the work pack scope, however it includes:

No ability to control flare-ups on the furnace;

Off gas unit installed on Furnace 1 but it never worked and has been disconnected,investigate why it never worked and make recommendations to its re-instatement orremoval;

Ageing ash cooling system (30 years old);

Issues with ID fan and valve, no redundancy, ageing equipment, unreliable and nomonitoring;

Stack height/size causing OH&S issues with the stack emissions blowing back inside theincineration building.

2.7Foul Air System Investigations

There are several issues surrounding the existing foul air systems. The H2S monitoring is notsufficient and on flare up of the furnaces there is the potential of fires caused by build up ofgasses and also combustible solids in the ducting and the feed system.

The preliminary design needs to conduct a thorough investigation into the existing system,followed by detailed recommendations and pricing to allow the foul air system to comply withrelevant OH&S legislation. Since the foul air system is dependent on the outcomes of the CFDmodelling, this work pack will commence after the CFD modelling has been concluded.

The sizing and location of the foul air stack also needs to be considered in this preliminarydesign.


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2.8 Project Delivery TimetableRequests for Proposal (RFP) process

Following receipt of Expressions of Interest, it is proposed to complete the RFP processaccording to the timeline as set out below:

Ref. Activity Date

1. This Pre-qualification Requirements Brief will be issued byemail to registered parties.

Saturday 21 April 2012

2. Pre-qualification submissions must be received by: Tuesday 22 May 2012

2 pm AustralianEastern Standard Time

3. ActewAGL/ACTEW review of submissions.

4. ActewAGL plans to notify pre-qualified Proponents on orbefore: Friday 29 June 2012

Due to the dependency on the CFD modelling outcomes on several of the work packs, thepreliminary design work for each work pack will commence independently, the table belowgives indicative dates for the commencement of the RFT process for each work pack (the awardof the contract and start of the preliminary design will subsequently follow), however

ActewAGL reserve the right to alter any of the commencement dates and will provide thesucessfull consultant with a minimum of four weeks notice prior to the target date.

Ref. Activity Indicative Date

5. Target date for issue of the RFT documents for thepreliminary design consultancy for the CFD Modelling ofthe Incineration process (work pack 1).

Monday 6 August2012

6. Target date for issue of the RFT documents for thepreliminary design consultancy for the Screenings and GritSystems (work pack 2).

Monday 3 September2012

7. Target date for issue of the RFT documents for thepreliminary design consultancy for the Sludge and FeedSystems (work pack 3).

Monday 8 April 2013

8. Target date for issue of the RFT documents for thepreliminary design consultancy for the Furnace and ExhaustSystems (work pack 4).

Monday 1 July 2013

9. Target date for issue of the RFT documents for thepreliminary design consultancy for the Foul Air System(work pack 5).

Monday 2 September2013


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ActewAGL project staff and stakeholders will actively review draft submissions from theconsultant(s) throughout the development of the preliminary design.

Pre-qualification Selection Criteria

2.9 Summary of Pre-qualification CriteriaActewAGL is seeking Consultants that are able to provide an integrated project design deliverycapability for the preliminary design of the upgrades to the solids handling systems atLMWQCC.

The following pre-qualification criteria will be used:

Experience in producing Computational Fluid Dynamic models of solid wasteincineration processes, preferably within multi hearth furnaces (this is for work packone only)

Experience in the design of major Wastewater Treatment Plants including SolidsHandling Systems;

Skills and experience of Key Personnel the skills and experience of the nominatedKey Personnel in delivering the preliminary design and/or detailed design ofequivalent facilities. The experience of the consultants nominated project manager,senior wastewater treatment process designer, specialist process designer for eachwork pack, senior electrical engineer, senior mechanical engineer, senior hydraulicstructures engineer and senior plant hydraulics engineer in delivering and designingequivalent facilities will be considered as critical capabilities in the assessment; and

Adequacy and Commitment of Resources the Consultant must be able todemonstrate that their team has the required resources to undertake the Project, interms of both number and quality of staff, and must commit to the nominated KeyPersonnel being made available for the Project within the required Project timelines.

Referees may also be checked and taken into account in assessing skills, experience andcapability.


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3 Submission Requirements3.1 Format of Submissions

Pre-qualification submissions are to be a maximum of 17 pages in length (single spaced A4, 11point text), in addition to an executive summary or cover letter of not more than 2 A4 pages.

The required format is as follows:1. Corporate Information maximum 1 page2. Principal qualifying characteristics statement maximum 2 pages3. Reference projects maximum 2 pages4. Committed Key Personnel (max. 1 page per person) maximum 12 pages

3.2 Submission ContentsCorporate InformationLength: maximum 1 pageContent: Corporate details

Postal AddressStreet Address (for courier delivery)Contact details for the representative of the Consultant for the purposes of receivingall correspondence regarding this pre-qualification and RFP process, Pre-qualification submissions, including mobile telephone and email.

Principal qualifying characteristics statement

Length: maximum 2 pagesContent: Summary of:

Technical competence Experience in the detailed design of major wastewater/solid handling system

projects Project delivery management competence

Reference projectsLength: maximum 2 pagesContent: The specific experience and expertise of the proponent in the development and

completion of major waste water treatment projects, particularly of the nature

envisaged in this EOI document: Project titles and description (including the capital value of projects), include

dates when project was undertaken; Client names and referee names (including current phone numbers); Scope of consultants involvement on the project; The type of project delivery contract utilised on the project; Identify which Key Personnel have carried out primary roles on these projects.

Key personnelLength: maximum 12 pagesContent: Precise summary CVs of key personnel that the prospective Proponent will commit

to the project if successful (max. 1 page per person)Indicative list of Key Personnel:


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Consultants Project Manager Wastewater treatment senior process engineer Specialist process designer for each work pack (5 No.) Senior plant hydraulics engineer Senior hydraulic structures engineer Senior mechanical engineer Senior electrical & controls engineer CFD Modelling experts (where required)

3.3 Lodgement of RFP DocumentsRFPs submitted to the Tender Box shall be returned enclosed in a sealed envelope endorsedwith the tender number (1083/12) and closing date (22 May 2012) to:

The Tender BoxProcurement and Supply BranchActewAGL Distribution40 Bunda StreetCANBERRA CITY ACT 2601

Please note, this is not a postal address, deliveries must be made either by courier or in person duringnormal working hours.

RFPs can also be:

Emailed to [email protected] that the signed original RFPdocuments are received within seventy-two (72) hours of closing time. Failure to comply mayrender the Tender invalid.

3.4 RFP Closing TimeTenders close at 2 pm (Australian Eastern Standard Time) on Tuesday 22nd May 2012.

3.5 Verbal OffersActewAGL will not accept verbal offers.

3.6 Late SubmissionsActewAGL will only accept late tenders in exceptional circumstances. Acceptance will beconditional upon establishing conclusively that the integrity of the process has not beencompromised, and that late acceptance does not result in any administrative delay. Theacceptance of late tenders will be at the sole discretion of ActewAGL.
mailto:[email protected]:[email protected]:[email protected]:[email protected]


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4 Pre-Qualification4.1 Assessment

ACTEW and ActewAGL plan to assess properly submitted Pre-qualification Applications,using the criteria identified in Section 2.9, on or before Friday 29 June 2012.

4.2 Requests for Additional InformationIt is not anticipated that additional information will be requested from any prospectiveProponent. Nevertheless ACTEW and ActewAGL reserve the right to do so in order to clarifyany aspect of any particular Pre-qualification Application. Any request for additionalinformation will be forwarded in writing to the address and contact person nominated by theprospective Proponent in their Pre-qualification application.

4.3 NotificationACTEW and ActewAGL will advise all prospective Proponents, on or before Friday 29 June2012, whether or not they have been pre-qualified for the remainder of the RFP process.

Neither ACTEW nor ActewAGL is obliged to entertain or participate in any discussion orcorrespondence with any prospective Proponent about their Pre-qualification application, itstreatment, acceptance or rejection by them or any representation seeking further considerationby ACTEW and ActewAGL about their decisions.

5 Further InformationIf further information regarding the Project is required by any prospective Proponent, requestsmay be directed to ActewAGL via [email protected].

ActewAGL / ACTEW Corporation will not be bound by any verbal advice given or anyinformation furnished by any officer or agent in relation to the pre-qualification or RFP process,but will be bound only by written advice or information furnished by an authorised officer.
mailto:[email protected]:[email protected]:[email protected]:[email protected]


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Appendix A

Process Flow Schematic Diagram. Drg.# LM8P0-0059 (Rev 3)Furnace Exhaust Gas System Schematic Diagram. Drg.# LM1M0-0243 (Rev 1)

Sludge and Incineration Plant Flow Diagram. Drg.# LM1M0-0001 (Rev D)Furnaces and Auxillary Equipment GA Drg.# LM1G0-0008 (Rev A)

PSD Lower Molonglo Furnaces Report July 2009

ACVM Scoping Review Workshop Report Version 5 (February 2012)ActewAGL CX10677 Scoping Document Version 3 (March 2012)

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