A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Microbiological characterization of four composted urban refuses
AbstractThe microbial populations of four composed urban refuses, one of them amended with CaCO3, have been studied. The physiological groups with greatest influence upon the evolution and fertility of the soil were determined. The results were compared with the common numbers in soils and organic wastes. Variations in soil microbial population and nitrite oxidizers attributable to the action of the added compost were also recorded. Composted urban refuses had a high microbial population. Bacteria, a small proportion of which were spore-forming, predominated, but actinomycetes and fungi were also in high densities; on the contrary, algae were absent, except in CaCO3-amended compost. Most of the population had preteolytic, ammonificant, amylolytic and aerobic cellulolytic capacities, followed by denitrifiers, sulphate reducers and elementary sulphur oxidizers. The densities of aerobic and anaerobic free-nitrogen fixers, anaerobic cellulolytics, pectolytics, anaerobic mineralizers of sulphur and sulphide oxidizers were low. An important feature was the lack of nitrifiers in the wastes studied, the only exception being the compost amended with CaCO3 which had a relatively high population of nitrifiers. The urban refuse composts did not substantially affect the soil microbial population and had a short-term, slightly-positive, effect over nitrite oxidizers. Composting with CaCO3 seemed to notably improve the nitrite oxidizer population of the soil.
Microbiological characterization of four composted urban refuses
AbstractThe microbial populations of four composed urban refuses, one of them amended with CaCO3, have been studied. The physiological groups with greatest influence upon the evolution and fertility of the soil were determined. The results were compared with the common numbers in soils and organic wastes. Variations in soil microbial population and nitrite oxidizers attributable to the action of the added compost were also recorded. Composted urban refuses had a high microbial population. Bacteria, a small proportion of which were spore-forming, predominated, but actinomycetes and fungi were also in high densities; on the contrary, algae were absent, except in CaCO3-amended compost. Most of the population had preteolytic, ammonificant, amylolytic and aerobic cellulolytic capacities, followed by denitrifiers, sulphate reducers and elementary sulphur oxidizers. The densities of aerobic and anaerobic free-nitrogen fixers, anaerobic cellulolytics, pectolytics, anaerobic mineralizers of sulphur and sulphide oxidizers were low. An important feature was the lack of nitrifiers in the wastes studied, the only exception being the compost amended with CaCO3 which had a relatively high population of nitrifiers. The urban refuse composts did not substantially affect the soil microbial population and had a short-term, slightly-positive, effect over nitrite oxidizers. Composting with CaCO3 seemed to notably improve the nitrite oxidizer population of the soil.
Microbiological characterization of four composted urban refuses
Diaz-Raviña, M. (author) / Acea, M.J. (author) / Carballas, T. (author)
Biological Wastes ; 30 ; 89-100
1989-02-28
12 pages
Article (Journal)
Electronic Resource
English
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