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Thursday, 15 November 2012 09:57

Solid Waste Management in Nigeria

Written by  Edith Tobore Iruruaga

Waste Management Services

Waste Generation

There are varied data on waste generation and composition due to poor information management but notable of use is the study carried out by TC Ogwueleke in 2009 in some cities as shown below.

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Presently, the rate of waste generation in Lagos (with estimated population over 10 million in 2012) is 9, 000 tonnes/day (Lagos State Waste Management Authority, LAWMA) while in Kano State, the rate is 3, 849 tonnes/day (Bayero University Kano Consultancy Unit). Generally, the average rate of generation is estimated as 0.5kg/capital/day.

Biodegradable waste account for over 50% of waste generated with other component estimated at different composition in different States. A recent study carried by the Bayero University Kano Consultancy Unit (March, 2012) estimated the following composition for Polythene/cellophane= 19% Paper = 12.7%, Metal= 10%, Glass=8.7%, Plastics=11.3%, Fines (ash, dust and sand)=12% Miscellaneous =9% while a study by the Basel Convention Coordinating Centre for Africa in 2009 reveals that 70% of all imports were used electronic electrical equipment of which about 30% could be described as E-Waste.

Generally, all waste streams are stored together in either bags or containers (such as used buckets) and plastics waste bins. LAWMA provides 240 litres bins for households after annual payment of the Land Use charge through the Land Records Company.

Waste Collection

Waste Collection service is offered mainly by the public sector though some State Governments operate some level of formal public-private participation (PPP). It is not, however, uncommon to see informal waste collector using local vehicles (push carts) for collection services from door to door in some parts of Nigerian cities.

Collection service is mostly exclusive to the urban cities with not higher than 50% efficiency in most cities with Lagos and Calabar (in Cross Rivers State) as exception. The rural areas and urban slums are hardly rendered such services. The relatively success story of Lagos could be traced to the level of cost recovery from the public (waste generators) and strong political will towards good waste management in the State.

The Lagos State Government through LAWMA engages, coordinates and evaluates the activities of its private sector participant (they are over 300) into Municipal Solid Waste Collection. Collection frequency is either once or twice a week and usually on door –to-door basis. This is usually difficult in densely populated areas and it not uncommon that collection frequency is elongated.

Waste Transfer

Waste transfer station is not common in Nigeria the only State that has a waste transfer station is Lagos State. Below is the activity of the two transfer loading stations in the State for the 1st half of 2012.

Recycling

Recycling activities have been more of the informal sector on selected valuable materials. The formal sector is becoming interested in some States as they are pilot projects either running or planned for. In such projects source separation of waste is encouraged.

Examples of recycling activities in Lagos State include;

  • Compost plant at Ikorodu for the treatment of market waste - it generated a minimum of 24, 000 tonnes and maximum of 42, 000.00 tonnes of compost in 2nd half of 2011
  • Waste-To- Energy plant at Ikosi Market – generate biogas from the market waste that is used to operate 2KVA generator at the market.
  • Plastic recycling plant at Olushosun for the conversion of water sachet into garbage bags – the Government introduced a buy back programme for water sachet, cartons, paper and glass.
  • Formulation of recycling clubs in secondary schools to instil recycling habit in young people

                          ed01     ed02

                                          Recycling Bank                   Waste-To-Energy Plant at Ikosi market

 Informal Recycling Sector

The Informal recycling sector is very active in waste management system in Nigeria. We have them either as itinerant waste buyers or scavengers and they target valuable materials such as plastics, paper, used electronic electrical equipment, glass, metal etc. Their activities have great impact in the reduction of the net volume of waste disposed of. However their importance, there is no formal integration of this stakeholder into the system except in Lagos State.

LAWMA introduced recycling banks (see picture above) in some organized areas where household are encouraged to deposit their recyclables like plastics, cans, bottles while the organic component are collected from door-to- door. Some of the scavengers in the State are employed by the Authority to be the Resource managers of the recycling banks. The Resource Managers, in addition to the income received from the Authority, are also given the recyclables to trade to supplement their income. The wages paid to them is a sort of incentive to dissuade them from working at the dumpsite. However, the numbers of the recycling banks are not sufficient to cater for the numbers of scavengers in the cities hence some of them are still allowed to scavenge materials at the site but are encouraged to use protective equipments.

Disposal

Wastes are disposed in dumpsites at designated land either owned by the government or private owner and in some cases in burrow pits and empty spaces illegally. The largest dumpsite possibly in Nigeria is the Olusohun dumpsite in Lagos. The Lagos State Government is working on extracting methane gas from the site as well as another dumpsite at Abule Egba. There are five approved dumpsites in total in the State. Below is the disposal activity for the 2nd half of 2011 and 1st half of 2012.

Source: Lagos State Waste Management Authority

The numerous dumpsites and heaps of dumps here and there in the Country pose serious environmental and health challenges and there is a need to check them.


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