DOI: 10.5593/SGEM2016/B32/S13.029


L. Ilie, M. Mihalache, D. Mihalache, I.M. Doru, D. Raducu
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-62-9 / ISSN 1314-2704, June 28 - July 6, 2016, Book3 Vol. 2, 219-226 pp

Recently, a lot of attention has been accorded to sewage sludge application and to its effects on soil and environment, generally. It is used in agriculture as fertilizer because it is characterized by nitrogen and phosphorus plant availability and high content of organic matter.
The interest emerged from the yearly increasing amounts of sewage sludge and also because of its advantageous effects on the physical and chemical properties of soil.
The objective of micromorphological analysis was to put in front at microscopic scale a series of details aspects like: the integration mode of the sewage sludge in Chromic luvisol matrix characterized by a loamy clay texture; the sewage sludge spatial distribution in soil matrix in correlation with texture and the proper characteristics.
The micromorphological analysis shows that during the parts disintegration of the sewage sludge, the background material splits in spheroidal microaggregates that appears disseminated in lacunar space either singular or clusters; these will be integrated in the soil matrix during successive cycles by watering-drying and swelling-shrinking.
Sludge fragments produce a high lacunar space, because of their organo-ferric composition which determine the retention of some high water quantities and, implicitly, a higher power of swelling-shrinking.

Keywords: sewage sludge, soil, micromorphological analysis

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