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Biodegradable municipal solid waste: characterization and potential use as animal feedstuffs
A J García1, M B Esteban, M C Márquez
1Department of Chemical Engineering, University of Salamanca, Spain.
Waste Management (New York, N.Y.)
|August 30, 2005
Summary
Biodegradable municipal solid waste (BMSW) fractions like meat, fish, and fruit/vegetable waste show potential as animal feed ingredients. Heat treatment improves safety and reduces moisture for easier processing and inclusion in commercial diets.
Area of Science:
- Waste Management
- Animal Nutrition
- Food Science
Background:
- Municipal solid waste (MSW) contains valuable organic matter.
- Utilizing biodegradable MSW (BMSW) fractions can offer sustainable alternatives for animal feed.
- Current feedstuff regulations must be considered for waste valorization.
Purpose of the Study:
- To evaluate five BMSW fractions as potential animal feedstuffs.
- To determine the chemical, microbiological, and contaminant profiles of these waste fractions.
- To assess the feasibility of incorporating treated BMSW into animal diets.
Main Methods:
- Collection of BMSW samples from various sources (shops, restaurants, treatment plants).
- Analysis of chemical composition (nutrients, moisture), microbiological load, and contaminants (metals, dioxins, furans, PCBs).
- Application of heat treatment (65°C for 20 min) to assess its impact on safety and moisture content.
Main Results:
- BMSW fractions exhibited high moisture content (60-90%).
- Specific fractions were nutrient-dense: meat waste (ether extract), fish waste (crude protein), and fruit/vegetable waste (nitrogen-free extract).
- Restaurant and household waste fractions had balanced composition but exceeded permitted contaminant levels; heat treatment ensured microbiological safety and reduced moisture.
Conclusions:
- Meat waste, fish waste, and fruit/vegetable waste fractions are viable alternatives to conventional feed materials.
- Heat treatment is crucial for microbiological safety and improving handling properties of BMSW for animal feed.
- Further processing and regulatory compliance are necessary for incorporating restaurant and household waste fractions into animal feed.