Proposed Construction of Mitubiri
Sanitary Landfill Project.
Summary of Feasibility Study
Nairobi Metropolitan Services Improvement Project NaMSIP
January 2018
Location
• County Murang’a
• Constituency Maragua
• Ward Kimorori-Wempa
• Access to Site About 12 Kms from
Nairobi-Nyeri Road at
Kabati. Also lies close to
railway line
• General GPS Lat: 1° 00‘ 15.37“ S
Co-ordinates Lon: 37° 11‘ 0.18“ E
Access to Site
Photo of Access to Site - 1
Photo of Access to Site - 2
Photo of the Site
Land
Requirements Landfill – 50 Acres Buffer Zones – 20 Acres
Key Issues
• County government should push for the physical planning of the
Maragua Sub-County to forestall any unwarranted developments
and guide all physical developments in the best interest of the
landfill site
• Compatible land use around the landfill site
• Definition of buffer zones
• Restriction in the land use on the landfill site after closure
Assessments Done / Ongoing
• Geo-physical survey
• Topographical survey
• Environmental and Social Impact Assessment
• Test pits / test wells
• Air quality modelling
• Geological and hydro-geological studies
• Soil tests
Preliminary Landfill Design
Landfill Operations
Design of Waste Storage Cells
The main technologies employed in the design include:
- state-of-the-art bottom liner systems
- modern leachate collection and treatment
- landfill gas collection and monitoring
- groundwater monitoring
- engineered final cover layer
Waste Storage Cell Under
Construction
Solid Waste Characterization
Waste Components Approximations
– Organics 50% - 66%
– Paper & paperboard 11% - 25%
– Plastics 9% - 16%
– Textiles/leather 3% - 11%
– Glass 2% - 9%
– Metals 0% - 3%
– Electrical & electronics 0% - 2%
– Others 0% - 5%
Waste Minimization Activities
– Sorting
– Recycling
– Composting
This first preliminary design leads to a project life of
about 10 years with a daily incoming volume of
waste of 500t, i.e. an annual capacity of 180kt.
Solid Waste Characterization
Nairobi waste composition (from JICA, 2010)
Solid Waste Characterization
Estimated County Waste – t/day (2015)
0
200
400
600
800
1000
1200
1400
Nairobi City Kiambu Machakos Murang'a Kajiado
General Operation Flow
Leachate Production and
TreatmentEstimated volume of 4300m3 per year
Treatment through aerobic or anaerobic biological treatment
Example of a leachate pond
LANDFILL GAS (LFG) CAPTURE
AND USE SYSTEM
✓ As waste decomposes, it produces a blend of several gases,
including methane (about 50 %). This blend is called landfill
gas (LFG). LFG should be collected so as to:
Prevent gas migration (off-site migration may cause explosions);
Prevent global warming (methane is 21 times more efficient at trapping heat
than carbon dioxide) and implement CDM;
Avoid the release of toxic compounds in the atmosphere;
Use LFG for energy production
Organization Staff
General Manager
Operations Manager
Weigh-bridge Staff
Reception StaffTechnicians Security Staff
Maintenance Manager
Cleaning Agents
Mechanicals
Engine Drivers
Finance Manager
Accountant
Other staff – Sorting, Cleaning, Maintenance ► estimated at about 300No. at
optimal performance
Landfill Operation Mobile
Equipment
Type of engine Number required
Waste compactor 1
Dozer 1
Front loader 1
Trucks 3
Excavator 1
Operational Costs / Year
OPERATION (8hrs x 2 shifts) USD
FUEL (diesel for landfill equipment) 438 000
PERSONNEL (administration+sorting+operations) 654,545
UTILITIES (electricity, water, telephone) 58,400
MAINTENANCE (5% of infrastructure CAPEX + 15%
of equipment)
534,350
LEACHATE TREATMENT 245,000
TOTAL 1,930,295
Regarding the total capacity of the site, the cost of operation would be between
9 and 10 USD per ton about 1Ksh per Kg at optimal performance of
landfill