The Waste Flow Diagram (WFD) estimates the amount of solid waste entering nature and the oceans from various sources. A scenario function is used to simulate how improved waste management could reduce pollution and prevent marine litter.
Mombasa is the second largest city in Kenya and located on the shore of the Indian Ocean, a cosmopolitan city with an estimated resident population of 1.2 million persons, translating to a density of 4,097 persons per square Kilometre.
There are 6 sub-counties and 29 wards within Mombasa County with varying means of MSW collection within the wards. There are county collection trucks, mainly collecting from common collection points, private companies and registered individuals/groups using handcarts, collecting from households (HH) and premises.
Mombasa County generates approximately 708 t/day of MSW and out of this, 56% (396 t/day) is collected. Out of 396 t/day of waste collected in Mombasa, 5% (36 t/day) is managed in controlled facilities through processing for recovery. There are numerous companies dealing with recovery of various types of materials including paper & cardboard, plastic (HDPE, LDPE, PP and PET), metals and glass with paper & cardboard having the highest demand and biggest fraction recovered, up to 20t/day.
There is one main designated waste disposal site in Mombasa, Mwakirunge. It is located approximately 30 kilometres from the city centre and sits on 50 acres of land that is owned by the county government. The city also has 4 other ‘recognised’ disposal sites; 50% (355 t/day) of the MSW generated is managed through disposal sites. All the dumpsites in Mombasa have no environmental control.
| City | Mombasa |
|---|---|
| Financed by | UN Habitat |
| Implemented by | International and National consultant |
| Population | 1,208,333 (2020) |
|---|---|
| Waste generation rate, including commercial and institutional waste | 0.59 kg/cap/day (WaCT Survey) |
| Total MSW generation | 708 tonnes/day (WaCT Survey) |
| Collection rate | 56% |
| MSW sent to disposal | 355 tonnes/day / 50% (WaCT Survey) |
| MSW sorted for recovery | 40.5 tonnes/day / 6% (WaCT Survey) |
| MSW managed in controlled facilities | 4% (WaCT Survey) |
| Plastic waste generation | 19,401 tonnes/year |
| Unmanaged plastic | 9,961 tonnes/year 51% of the entire plastic waste generation |
| Plastic waste to the environment | 9,961 tonnes/year | 51% of the plastic waste generated |
|---|---|---|
| Plastic to water systems | 3,885 tonnes/year | 5,287 trucks |
| Plastic to water systems per person | 3 kg/person/year | 99 PET bottles per person |
This case study’s data was collected by UN-Habitat Waste Wise Cities Campaign.
The Waste Flow Diagram (WFD) estimates the amount of solid waste entering nature and the oceans from various sources. A scenario function is used to simulate how improved waste management could reduce pollution and prevent marine litter.
