From our original involvement in landfill in the early 1990s, FT has been at the forefront of research into the management and optimisation of landfill gas.  We are market leaders in this area, with a team of internationally recognised landfill gas experts providing innovative solutions and guidance to both regulatory authorities and operators in relation to the optimisation and management of landfill gas.

 

We have developed a unique, bespoke gas management and auditing software package to facilitate the balancing and management of landfill gas extraction, together with associated environmental monitoring and reporting.  We received a high commendation from the Association of Consulting Engineers of Ireland (ACEI) for this work in 2008.  The software is currently in use on a number of landfills in Ireland.

 

The landfill gas philosophy and working practices developed and promoted by FT have had a direct impact on landfill gas extraction management practices, reduction of greenhouse gas methane emissions and maximisation of power generation from landfill gas engines.

 

FT offers a complete range of landfill gas related services including:

  • Design of gas collection and treatment solutions (including utilisation, flaring, venting, alternative oxidation methods)
  • Specialist design services in relation to the management of low calorific landfill gas
  • Technology review and assessments
  • Design and execution of landfill gas audits
  • Development of strategies to manage landfill gas
  • Balancing and management of landfill gas extraction systems
  • Management of odour
  • Landfill gas prediction modelling
  • Carbon credit assessment
  • Bioreactor design
  • Tender and Contract management
  • Preparation of business case for gas management.

 

FT’s work in this area is recognised through a number of awards and publication:

  • 2012, finalists in “Green Awards” Innovation category for works in landfill gas management on Irish landfills.
  • 2008. Association of Consulting Engineers of Ireland President’s Award – High Commendation – Innovation in Design of Landfill Gas Management Philosophy
  • A Management and Auditing Model for Balancing Landfill Gas Extraction.  C. J. Cronin, P. Kelly, E. Hanley, T. Ruddy, J. Smith Proceedings Waste 2008.
  • A Spreadsheet Tool to Calibrate LANDGEM Gas Prediction Software for Specific MSW Facilities Using Data from Gas Extraction Audits.  C. J. Cronin, P. Kelly, T. Ruddy, D. Smyth, S. Myler. Proceedings Sardinia, 2011.
  • A Spreadsheet Tool to Calculate Landfill Gas Flow Across a Range Of Control Valves or to Select Appropriate Valves Based on Design Flows, C. J. Cronin, B. Ward (ZWS), J. McFeat (SEPA), S Willacy, A. Riordan, N. Menzies, T Ruddy, ISWA World Conference 2013, Vienna, Austria.

Our Projects

Green House Gas Emissions (GHG) from Landfills in Scotland

Green-House-Gas-EmissionsClient: Zero Waste Scotland (ZWS)

Location: Scotland

Key Facts: ZWS and the Scottish Environment Protection Agency (SEPA) appointed FT (together with our Scottish partner, IKM Consulting) to investigate opportunities to reduce methane emissions from historic/closed landfill sites in Scotland and, in turn, provide the Scottish Government with robust evidence on which to base actions on securing better mitigation, capture and utilisation of methane emissions from those landfill sites.

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FT were appointed to carry out the following tasks:

•    Estimate greenhouse gas emissions from landfill sites in Scotland •    Carry out a literature survey of best practice in relation to oxidation of landfill gas •    Carry out site trials to: o    Identify key operational parameters affecting to gas flares in the context of issues associated with mitigation of greenhouse gas (GHG) emissions o    Review the biological methane (CH4) oxidation potential of readily available materials such as woodchip and similar substances o    Assess auditing and balancing protocols for landfill gas extraction o    Develop remote monitoring protocols to monitor flares in distant locations o    Consider different approaches for the management of extraction from  flow control valves at well heads o    Establish characteristic curves for a range of commonly used well head valves o    Evaluate the odour potential of flare stack emissions running at different stack temperatures.

FT were responsible for scoping the trials and day to day operations on site, and for the production of 4 reports on findings, which have published online by WRAP/ZWS (http://www.wrap.org.uk/content/review-options-reducing-greenhouse-gas-emissions-landfills-scotland).

The trials yielded very interesting findings which were presented by our Project Manager at the International Solid Waste Association conference in October 2013.

Infrastructure-AssessmentLandfill Gas Collection and Treatment Infrastructure Assessment

Client:  South Dublin County Council (SDCC)

Location:  Ireland

Capital Value:  n/a

Key Facts: Arthurstown landfill is Ireland’s largest municipal solid waste landfill accepting 600,000 tonnes per annum until December 2010.  FT was retained by SDCC to undertake an option appraisal on current and future landfill gas management strategies of the facility.

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Approximately 4.8 million tonnes of waste were disposed of in the Arthurstown landfill between 1997 and 2010.  The peak landfill gas flow rate was approximately 13,000 m³/hr.

In 2008, SDCC commissioned FT to carry out an assessment of future landfill gas generation potential, following on from the realisation that as waste placement ceased at the site, landfill gas generation rates were likely to decrease.

The first task of the project was to carry out research on a landfill gas prediction model (GasSIM) prepared on behalf of the third party running the landfill gas utilisation plant.  This was to establish whether there is enough utilisation capacity for the short term.  The second task of the project was to predict when specific engines will no longer be feasible on site, therefore requiring increased flare capacity. The aim was to put a flare purchasing plan in place for the long term management of landfill gas emissions as landfill gas utilisation decreases on site.

The following tasks were included:

  • Review and assess the fitness for purpose of existing site gas prediction model
  • Modelling of future gas yields and sensitivity analysis of variables on model outputs
  • Determine the future requirement for landfill gas flares, including number, sizes Prepare a report describing the phased implementation of various landfill gas management options in terms of operational logistics and financial costs.

Midlands-Region-LandfillMidlands Region Landfill Gas Utilisation Project

Client: Offaly County Council (acting on behalf of Laois County Council, Westmeath County Council)

Location:  Midlands Region, Ireland

Capital Value: TBC

Key Facts: Provision of technical assistance for the procurement of a design, build operate and finance (DBOF) landfill gas utilisation project at the landfills of Derryclure, Ballydonagh and Kyletalesha.

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This project is for the procurement of landfill gas utilisation contractor for 3 no. landfill sites in the Irish Midlands. Each of the three sites has closed to waste acceptance, with current landfill gas management using flares.  The proposed contract will see the DBOF contractor install landfill gas utilisation engines at each site, in order to generate energy through the combustion of landfill gas.

FT’s appointment was as Employer’s Representative for the contract.

Our duties include:

  • Assessment of current site infrastructure at each site
  • Development of proposed landfill gas management philosophy for each site, to be included in the DBOF contract
  • Preparation of tender documents (using a FIDIC based contract) to enable the three local authorities to go to market to seek bids for landfill gas utilisation at their respective landfills, including development of site specific landfill gas models, Net Present Value calculation tools, specifications, contract documents and drawing
  • Tender evaluation and recommendation
  • Preparation of specified engineering works submission to the Agency for each of the 3 sites
  • Supervision of on-site works, administration of the contract and handover of the works to each of the respective local authorities.

guidanceGuidance Document on the Monitoring and Management of Landfill Gas Flare and Engine Emissions (AG7)

Client: Irish Environmental Protection Agency (EPA)

Location: Ireland

Capital Value: N/A

Key Facts: The preparation of a guidance document outlining best practice in the area of landfill flare and landfill gas engine emissions monitoring and management.

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FT in association with Site Right Environmental were appointed to prepare this Irish national guidance document.  Its preparation was broken down into two phases:

Phase 1 – Preparation of a review document outlining the approach to landfill flare and landfill gas engine emission monitoring in Europe and the United States

Phase 2 – Preparation of a national guidance document outlining specific emission monitoring requirements and methods for flares and engines (i.e. allowable emissions and monitoring frequency).  The guidance document specified the reporting requirements for compliance assessment and the criteria for assign flare and engine performance.

The guidance document included a review of suitable management techniques for older landfill with declining landfill gas production and methane concentration.  It also proposes the use of site specific risk assessments whereby, on a case-by-case basis, landfill flare and engine operation, monitoring and maintenance practices outlined in a facilities waste licence may not be suitable for a particular site at a particular stage of its life.  Under these circumstances an assessment will be required to evaluate potential conflicts between achieving emission limit values and the management of fugitive landfill emissions.

The final document was published as a national guidance note (AG7) for use by landfill operators and their monitoring contractors and the EPA: (http://www.epa.ie/pubs/advice/air/emissions/guidancenoteonlandfillflareandenginemanagementandmonitoringag7.html)

Europe

chrisChris Cronin – Principal Engineer

Telephone: +353 21 4964133

Email: chris.cronin@nullftco.ie

Linkedin: Add me on Linkedin

 

Eamon TimoneyEamon Timoney – Managing Director

Telephone: +353 21 4969553

Email: eamon.timoney@nullftco.ie

Linkedin: Add me on Linkedin

 

 

 

 

 

Fehily Timoney Fehily Timoney