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Articles by K.N. Segbeaya
Total Records ( 1 ) for K.N. Segbeaya
  E.K. Koledzi , K.N. Segbeaya , M. Tcha-Thom , G. Baba , G. Matejka and G. Tchangbedji
  Background and Objective: Metals may constitute problems in waste management because of their multiple sources and potentially high toxicity of some constituents. Processes of composting do not always guarantee acceptable quality of the compost in terms of hazardous metals. The aim of this study is to assess the balance of some heavy metals during the composting of different categories of urban waste. Methodology: Sorting and composting were used to separate the waste into different categories. Leaching test with EDTA solution were used to extract and study the speciation of Pb. The AFNOR recommendation were applied for determining the amount the heavy metals meet in Togo’s waste and during composting. Results: The results showed that, the fraction of the super fines for example with a particle size of less than 10 mm, contributes 30-56% of the total and average contents of metals in compost. Sorting of waste into various fractions such as plastics, hazardous materials, glass, miscellaneous combustible material, metals and super fines lowers the metal contents in finished compost by about 80%. The remaining 20% can be washed during the fermentation of windrows or still better can be reduced by chemical complex formation in the compost as shown by the leaching adequate test. The average content of metals is classified as followed: Cd<Ni<Cu<Zn<Pb. Only the Pb content exceeds the level of the French standard (AFNOR). The higher the rate of organic matter is the lower rate of extraction. Conclusion: Thus, contamination can largely be avoided by separating the organic waste from other residues prior to composting. This, will provide the necessary arguments to convince the populations to subscribe to programs of management of specific waste as for example the elimination of super fines in the waste in the case of Lome.
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