Mauritius produces a significant amount of degradable organic waste, yet most of it is landfilled. By investing in composting, biogas production, and public awareness, the country can reduce landfill dependence, lower greenhouse gas emissions, and promote circular economy principles. A well-structured organic waste management strategy will ensure long-term environmental sustainability while creating green jobs and reducing waste-related costs.
Degradable organic waste consists of biodegradable materials that decompose naturally through biological processes. In Mauritius, such waste forms a significant part of the municipal solid waste stream and includes food waste, yard waste, paper, and textiles. The effective management of degradable organic waste is crucial for reducing landfill pressure, lowering greenhouse gas emissions, and promoting sustainable waste management practices.
Composition of Degradable Organic Wastes in Mauritius
The 2021 National Solid Waste Characterisation Study (google access) found that degradable organic waste represents 71.5% of the total municipal solid waste (MSW). The breakdown is as follows:
- Food Waste: 16.3%
- Yard Waste: 32.2%
- Paper Waste: 17.0%
- Textile Waste: 6.0%
This data highlights the dominance of organic waste in Mauritius' waste stream, with food and yard waste accounting for nearly half of all waste generated.
Characteristics of Degradable Organic Waste
Moisture Content Range: | Degradable Organic Carbon (DOC) Content: | |
Food Waste | 29.7% - 69.5%. | 20.4% |
Yard Waste | 40.4% - 71.7% | 16.8% |
Paper Waste | 11.6% - 22.0%. | 30.6% |
Textile Waste | 6.1% - 31.3% | 25.7% |
The high moisture content of food and yard waste reduces their energy recovery potential, making composting and anaerobic digestion preferable disposal options. | Overall DOC Content: Ranged between 0.119 to 0.193 Gg C/Gg waste. The DOC values indicate the carbon content available for biochemical decomposition, making these waste types suitable for biogas generation and composting. |
Current Management of Degradable Organic Waste
Despite the high organic content in Mauritius' waste stream, most of it is sent to the Mare Chicose landfill. The key components of the current waste management strategy include:
Landfilling:
- Over 95% of waste is landfilled, including a large portion of biodegradable waste.
- Organic waste decomposition in landfills generates methane (CH4), a potent greenhouse gas
Limited Composting:
- A composting facility at La Chaumière was operational from 2011 to 2017, processing 180,000 tons of waste annually before shutting down due to technical issues.
- Currently, composting is mainly small-scale, involving agricultural and community initiatives.
Recycling & Waste-to-Energy Potential:
- Paper recycling is minimal, with most waste being exported for processing.
- Biogas production is possible from high-DOC organic waste, but infrastructure remains underdeveloped.
- Anaerobic digestion could convert food and yard waste into energy, reducing dependence on fossil fuels.
Challenges in Managing Degradable Organic Waste
- Lack of Large-Scale Composting Infrastructure – The closure of the La Chaumière composting plant means there is no dedicated facility for organic waste processing.
- High Moisture Content in Organic Waste – Makes waste-to-energy methods inefficient, limiting incineration as an option.
- Limited Public Awareness – Many households do not segregate waste, leading to contamination and reduced recycling rates.
- Methane Emissions from Landfills – Organic waste in landfills releases methane, contributing to climate change.
- Seasonal Variability – Waste composition fluctuates throughout the year, impacting processing efficiency.
Recommendations for Improved Management
To transition towards sustainable organic waste management, Mauritius should implement the following strategies:
Develop Large-Scale Composting and Biogas Facilities
- Reactivate the La Chaumière composting facility or construct a new industrial composting plant.
- Establish community-based composting initiatives for small-scale organic waste processing.
- Promote anaerobic digestion to generate biogas from food and yard waste.
Encourage Waste Segregation at Source
- Mandatory organic waste separation should be implemented at household and commercial levels.
- Provide color-coded bins for easy identification of degradable waste.
Expand Waste-to-Energy Initiatives
- Invest in biogas production from food waste to supplement the national energy grid.
- Explore refuse-derived fuel (RDF) technology for non-compostable organic waste.
Increase Public Awareness & Participation
- Educational campaigns to encourage households and businesses to segregate waste.
- Provide financial incentives for companies engaged in organic waste recycling.
Legislation & Policy Strengthening
- Implement organic waste diversion targets (e.g., 50% of food waste recycled by 2030).
- Offer tax incentives for companies investing in organic waste management solutions.
