Regenerative Energie
SUMMARY:
The present work intends to contribute to the quality assessment of several composts produced in Portugal. Four commercial composts produced from poultry litter, urban residues and sewage sludge, and two home-made composts, produced from domestic wastes (kitchen refuses) through thermal composting and vermicomposting were compared.
The evaluation involved analyses of physical-chemical, chemical and microbiological parameters: moisture, pH, electrical conductivity, organic matter, total nitrogen, C/N ratio, ammonium nitrogen, heavy metals and enumeration of total heterotrophs, coliforms, enterococci, actinomycetes and fungi. The assessment of stability and maturity of composts was carried out through self-heating test, respiration activity after 4 days test and germination index. Some differences were evident among the six composts. For all composts analysed, the content of at least two different heavy metals analysed were above the values recommended, for soil improvers and growing media, in the EU Decision (EC, 2001), but below of those of Portuguese (EU base) regulation proposal (Gonçalves and Baptista, 2001). Domestic wastes and urban residues composts presented, respectively, the highest and the lowest counts of total heterotrophs, coliforms and actinomycetes, whereas the poultry compost presented the highest counts of enterococci. The vermicompost showed the highest counts of fungi. Results showed that the poultry compost has the lowest quality in contrast with the sludge compost that has the highest quality.
| Copyright: | © European Compost Network ECN e.V. |
| Quelle: | Orbit 2006 (September 2006) |
| Seiten: | 8 |
| Preis: | € 0,00 |
| Autor: | Maria Elisabete Ferreira Silva Prof. A. Cristina Cunha Queda C. Silva O. C. Nunes C. M. Manaia |
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