Managing Leachate to Achieve Project Success at González …€¦ · Catan - Combined 98% 100% 99%...
Transcript of Managing Leachate to Achieve Project Success at González …€¦ · Catan - Combined 98% 100% 99%...
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Managing Leachate to Achieve Project Success at González Catán Landfill in Argentina
Presented by: Michael Cruz – CRA MexicoDuncan Millar – CRA Canada
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Objective
To explore the challenges that leachate management in Clean Development Mechanism (CDM) projects represent and to use the the González Catán Landfill Development Project as a case study to illustrate them
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González Catán Landfill
Located in the town of González Catán, in the Municipality of Matanza, Province of Buenos Aires
Operating since 1979
Receives approximately 1,800 tonnes per day of municipal solid waste (MSW)
Composed of five modules – four of the five are currently closed, only one still in operation
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González Catán Landfill
Approximately 120 Hectares
Equipped with leachate treatment plant and retrofitted leachate collection system
Current tonnage of waste disposed approximately 14.5 million tonnes
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González Catán Landfill
Aerial Photograph of González Catán Landfill
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Catán Landfill
Located in proximity to the largest estuary of the world, La Plata River
González Catán is 45 feet above sea level
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Environmental Challenges
Buenos Aires area is warm and wet, with an average rainfall of approximately 43 inches per year and an average temperature of 60oF
As a result: • greatly affects recoverability of landfill gas
from the site • direct contributor, along with the cover
conditions, to the high leachate mounds encountered.
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Baseline
Fundamental requirement of Kyoto-style projects – emission be additive
Project baseline definition: • no active control system to limit the
uncontrolled release of LFG into the atmosphere
• In Argentina there is no regulatory requirement to combust LFG
• All LFG combusted for project qualifies for consideration and contributes to the generation of CERs
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Description of the Project
Clean Development Mechanism (CDM) project for collection and combustion of landfill gas (LFG) over a ten year-period utilizing a high efficiency enclosed flare
Reduce greenhouse gas emissions (GHGs) to generate Certified Emission Reductions (CERs) for revenue generation purposes and the environmental benefits.
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Description of the Project
Involved the construction of • a LFG collection system consisting of
vertical LFG extraction wells• horizontal trenches• centrifugal blower(s), flare• all other supporting mechanical and
electrical subsystems and appurtenances necessary to collect the LFG
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Description of the Project
The LFG collected from the Sites is combusted in enclosed LFG flares with full process controls and instrumentation installed and operating in accordance with the performance specifications
Quarterly flare emission monitoring
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Technology Used
a grid of vertical gas extraction wells and horizontal trenches within the landfill
centralized blower system used to induce vacuum
state-of-the-art high-efficiency enclosed flare
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Technology Used
Vertical gas extraction wells and horizontal trenches - connected to the blower system through a network of piping installed on and around the perimeter of the landfill
Extraction wells are connected to the sub- header or directly to the header through smaller diameter laterals
a vacuum is applied through the piping network - LFG out of the waste.
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Layout of Collection System - Catán
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Technology Used
Valves are used to control the flow
Non-perforated LFG collection piping is utilized to convey the LFG from the extraction wells to the gas control plant at each Site
Extracted LFG is sent to the enclosed flares for destruction of the methane component of the extracted LFG.
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Technical Challenges during Project Implementation
Limited cover system over the waste and the high leachate mound within the waste masses
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Technical Challenges during Project Implementation
High leachate mound levels, Catán
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Technical Challenges during Project Implementation
Limited access due to heavy storm
Engineering controls necessary for leachate and stormwater management
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Technical Challenges during Project Implementation
Cover over Module 2, Catán Landfill
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Improvement on Credits Generation2008 CERS and Monthly Average Run Time
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Improvement on Credits GenerationReasons
Continue landfilling activities in modules
Preparation of extended area – Module 5
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Improvement on Credits Generation
Leachate control through deeper trenches draining towards the slope
Installation of deep trenches
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Improvement on Credits Generation
Installation in active areas making possible to collect LFG sooner
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Conclusion
care must be taken to understand the local challenges and inputs that could affect revenues and hinder the success of the project
can become very rewarding and successful ventures
offer many environmental benefits, which can foster technology transfer and support waste management systems development throughout the developing world