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