R.M.T.D. Madusanka,AS2012135.

THE FIRST EVER “STATE-OF-THE-ART SANITARY LANDFILL”

OF SRI LANKA.

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……………….Content………………….1) What is a Landfill?2) Sri Lankan scenario3) “Pilisaru” National Solid Waste Management Project.4) Sanitary landfills for sri Lanka5) Landfill to Dompe as a pilot project.6) The first ever “state-of-the-art sanitary landfill” of sri Lanka7) Public awareness programmes & Protests. 8) Approvals & Constructions9) Life time & post closure plan10)Design of the landfill11)Pros & Cons12)Recommendations13)Resource persons14)References

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What is a Landfill?

A site where waste is isolated from the environment until it is safe. (until completely degraded biologically, chemically and physically.)

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Sri Lankan scenario… Sri Lanka generates around 6400 tons of wastes per

day -2700 tons collected by local authorities & buried. -3700 tons are thrown away at road sides. waterways & wetlands.

Colombo municipal area generates around 700 tons of wastes per day.

Sri Lankan government annually spends roughly Rs 3 billion in solid waste management

(source:-Ministry of environment & renewable energy)

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“Pilisaru” National Solid Waste Management Project.

Established in the CEA with effect from 1st January 2008 with the participation of other government organisations,

specially Urban Development Authority private Institutions, NGOs & experts in this field.

Main objectives.1) Development of a National Policy on Solid Waste Management.2) Development of a National Strategy on SWM.3) Effective education & awareness for all stakeholders on SWM

including training & capacity building.4) Facilitation for LAS for implementation of SWM projects /

programs.5) Legal reforms to strengthen effective law enforcement.

5LANDFILLS

Sanitary landfills for sri Lanka…...

Construction of low cost sanitary landfills for disposing residual waste is a key activity of “Pilisaru” project.

❖ Government of korea agreed to provide technical and financial assistance in this case.

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Landfill to Dompe as a pilot project.

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❖ The Korean Government channelled through KOICA, provided $ 4.5 million as a grant to establish a fully engineered state-of-the-art sanitary landfill in Dompe, Gampaha District.

❖ A commercial forest plantation of Acacia & Pinus in Maligawatte owned by forest department selected as the landfill site.

The first ever “state-of-the-art sanitary landfill” of sri Lanka... what is a state-of-the-art sanitary landfill? ❖ A landfill includes,

-Liner system -Leachate collection & treatment system -Cap system -Gas recovery system or flaring system -Landscaping -Groundwater & gas monitoring system ❖ also require about 30 years of post closure monitoring & planning for

eventual community use

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Public awareness programmes & Protests.

❖ There was a enormous public protest demonstrated against the proposed sanitary landfill site at Dompe.

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❖ 60 pocket meetings and 8 special Pilisaru Parisara Gammana Programmes were conducted in Dompe area

Approvals…

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Constructions...

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Life time & post closure plan….

Originally planed for 6 years.(90tons per day) When restricted to dompe PS area due to

public protest,

Eco-park is planed to establish on the Landfill area after closure.

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-Average waste collecting in Dompe PS area per day lies between 5-10 tons.

-Life time will enhance at least up to 100 years???????

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Design of the landfill.

❏ Leachate control system

❏ Leachate collection system

❏ Leachate treatment

❏ Ground water & storm water collection system

❏ Gas emission system

❏ Monitoring system

❏ Compost plant 21

Leachate control system.➢ Cell system -Minimize the leachate generation

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Leachate control system… cont.

➢ Liners, 1.Bottom & sides of the landfill. 2.composite liner system. -Geotextile layer -Compacted clay layer -HDPE layer

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Cross section of the Lining system.

Gravel cover

Leachate collecting pipe Geotextile layer HDPE layer

Compacted Benthonite layer Geotextile layer

Ground water collecting pipe Compacted existing soil

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Leachate collection system.

➢ Perforated pipe system.

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Leachate treatment.

➢ Activated bioreactor.➢ Hambu Pan(Typha angustifolia) pond.

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Ground water & storm water collection system.➢ Perforated pipe system for ground water

collection.

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➢ A canal around the landfill to storm water collection.

Gas emission system.

➢ Collecting CH4 as a fuel will not cost effective since this is a small landfill.

➢ Gas flares are designed.

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Monitoring system.

➢ Ground water monitoring system only. -Two tube wells, -Two nearby residential wells.

➢ No gas monitoring system.

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Compost plant.

➢ Organic matter separates from the non degradable wastes.

➢ Use for composting.

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Pros…..1. Landfilling is a sustainable solution for the SWM difficulties in

the Dompe PS area.2. There will be no need to relocate any households/families

due to the operation of the project activities.3. There will be job opportunities for the unemployed

personnel in area. 4. Having a well planned monitoring system supervised by

monitoring committee.

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Pros……CONT…

5.Low pollution & other issues.

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Pros……CONT….

6. No threatened and endemic species are found in the proposed area.

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Pros…CONT…

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7. organic materials of MSW will be sorted & recycled. -Enhance the lifetime ofthe landfill.-Expect a annual incomeOf Rs10.06million.

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Pros……CONT…

Pros…..CONT…

8. Proper design,-Retention tank to store leachate.-Tyre washing basin

9.

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Retention Tank

A buffer zone established around the landfill with canopy trees(acasia).

Cons….1. Treated leachate & stormwater discharge

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-To a narrow irrigation canal in nearby paddy field. -Problem of local floods.

Cons……. CONT..

2. There is a nearby(20m downstream) wetland close to the site.

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vegetable farms.

Paddy field.

Cons……. CONT..

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3. Surface water drainage pattern in the area is not properly identified.

-canal around the landfill overflows in rainy days.

Cons……CONT….

4. Probability of contaminate the intake of Ranpokunugama potable water treatment plant.

Effluent canal pugoda ela kelani river

Intake

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Recommendations…1. Set a funding plan as no shortage of

funding for environmental monitoring.

2. Collect the leachate & send to a waste water treatment plant for the treatment.

3. Establish a sufficient canal system to drain out treated leachate & storm water.

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Recommendations…CONT…

5.Establish a protective system for liners & leachate collection system.

-Remove sharp objects in the sorting. -Wheels of operating vehicles get away

6. Conserve similar habitats in the adjacent areas.

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from the leachate collecting pipe system.

Resource persons…Mr.Chathura Malwana Site manager, Dompe sanitary Landfill.Mr. Kosala W. Gunawardena. Project officer, construction of solid waste disposal facilities project,

Central Environmental Authority. Mr.Rohana priyantha & U.Weerakkodi Dompe Surakeeme Sangvidanaya

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References…...1. Initial Environmental Examination Report for Proposed Final

Disposal Facility, at Maligawatte, Dompe 2009 august. 2. National ‘Pilisaru’ Waste Management Programme-J. Fernando

Central Environmental Authority, Sri Lanka.3. http://www.iiirr.ucalgary.ca/files/iiirr/256.pdf 4. Environmental Profile ,Dompe Divisional Secretariat 2001.5. http://

rdissanayake.blogspot.com/2012/06/moon-plains-sanitary-landfill.html

6. http://www.academia.edu/3694817/ Landfill site selectiln & evaluvation of Gohagoda Udapalatha dump sites,kandy district

7. http://www.bc.edu/bc_org/avp/cas/fnart/fa267/bos_fill.html8. http://www.sundayobserver.lk/2013/09/22/fea11.asp 9. Technical guidelines on solid waste management in sri lanka.

Prepared by pollution control unit of CEA

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THANK YOU

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