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Gohagoda Landfill Site in Sri Lanka

Gohagoda Landfill Site in Sri Lanka

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Gohagoda Landfill Site in Sri Lanka

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  1. Gohagoda Landfill Site in Sri Lanka 2003 JICA

  2. Present Condition of Gohagoda Landfill Site • Name of landfill site: Thekkawatta Landfill site, Gohagoda • Since: 1970’s • Land ownership: Kandy Municipal Council • Surrounding land use: The Mahawali river flows 200 m below the site in it Western side beyond a paddy field. Other area mainly consists of paddy land and residence facilities for workers.

  3. Present Condition of Gohagoda Landfill Site • Topography: The active filling area is located in a steep slope area, which hasalready filled up to the access road elevation. • Meteorology: The site is situated in Mid Country wet zone, which receive annual rainfall of 2500 mm with Binomial distribution pattern.

  4. Present Condition of Gohagoda Landfill Site • Hydrology: There is a small stream at the bottom of the landfill site which connect to the Mahaveli River 300 m away from the site. The stream already contaminated with leachate and it has directly diverted to the Mahaveli river without using for Irrigation of paddy field or domestic use. The catchments area of the dumping site is approx 3.5 ha including the active filling area.

  5. Present Condition of Gohagoda Landfill Site • Land Use: Agricultural and Residential area • Surrounding Area: Dumping area 2.5 ha Catchments area 3.5 ha • Disposal method: Controlled tipping No environmental protection measures are taken • Waste discharge: Municipal waste, Health care waste, Industrial waste, Sewage

  6. Existing Problems

  7. Present Condition of Gohagoda Landfill Site

  8. Present Condition of Gohagoda Landfill Site

  9. Present Condition of Gohagoda Landfill Site

  10. Present Condition of Gohagoda Landfill Site

  11. Current condition of Environmental impact

  12. Current condition of Environmental impact

  13. Current condition of Environmental impact

  14. Current condition of Environmental impact

  15. Present Condition of Gohagoda Landfill Site • Facilities - Control house: 1 building - Gate: None - Fence: None - Weigh bridge: None - Leachate treatment: No facility - Buffer zone: none - Electricity: Available - Water supply: Available - Telephone line: None

  16. Present Condition of Gohagoda Landfill Site • Staff allocation Supervisor: 1 person,Day or night shift Assistant supervisor: 1 person, Day or night shift Labour Group 1 (Waste unloading): 2 persons, Day shift Labour Group 2 (Waste unloading): 2 persons, Night shift Bulldozer operator: 1 person, Bulldozer Operation, Day shift

  17. Present Condition of Gohagoda Landfill Site • Operation and Maintenance - Executing organization: Kandy municipal Council - Equipment: Bulldozer (D4) 1 unit Backhoe Loader 1 unit

  18. Objectives of the project • The objective of project is to rehabilitate the existing Gohagoda landfill in order to mitigate environmental & sanitary hazards that caused by present open dumping practices. The rehabilitate landfill site will be a model of Rehabilitated dumping site for Sri Lanka as well as it will be a model for Lift-Up type landfill. In terms of environment protection, the improvement will reduce adverse effect on environment that has identified as a critical issue in Gohagoda Landfill Site.

  19. Conceptual Design of Improved Gohagoda landfill site

  20. Leachate Collection Pond

  21. Leachate Collection Pond

  22. Leachate Collection Pond and Gully suck & Leachate Treatment Facility

  23. Modification of leachate and gully suck treatment facility

  24. Modification of Gully suck and leachate treatment facility

  25. Bench after improvement

  26. Leachate collection facility on bench

  27. End of leachate collection facility on bench

  28. Bench after improvement

  29. Making gentle slope

  30. Slope after improvement by turffing

  31. Storm water drain after improvement

  32. Gas Ventilating Facility

  33. Security Facilities (fixed type fence) Installation of the fence

  34. Installation of the fence

  35. Installation of the fence

  36. Construction of new Access roads

  37. Construction of new Access roads

  38. Construction of new Access roads

  39. Construction of the temporary access road • This work is to construct a gravel faced temporary access road in the Gohagoda landfill site in accordance with drawings. • This work includes all required work such as survey, filling soil on waste dumped to form a road base, spreading and compacting 0-40 mm crushed stones with 5 m width and 15 cm thickness. The sufficient density shall be obtained by compaction.

  40. Relocation of control house

  41. Details of operation and maintenance of components of landfill facility • Stuffing on the Finished Slope Turffing on the finished slope is required for protection of the slope and mitigation of landscape. • Extension of Gas Ventilation Pipes

  42. Extension of Gas Ventilation Pipes

  43. Maintenance of Installed Facilities • Fence, access road will be maintained when these are damaged. The drain will be cleaned every one month in order to prevent from blocking.

  44. Cleaning of pipes is required once a week

  45. Management of sludge of Leachate & Gully suck treatment system

  46. Details of usage of cover material

  47. Evaluation of improvement • The Gohagoda landfill site for Kandy which has been used for more than 30 years was having serious environmental impacts on the surroundings. These impacts were greatly mitigated by the improvement project including a leachate collection and treatment facility, greenery of slopes, prevention fences for waste scattering, a drainage system, access road, etc. This would be a good example for other local authorities.

  48. Level evaluation before and after improvement