Technosols manufacturing from sewage sludge to recover degraded soils

The Technosols (TCNS) are “anthropogeomorphic material”, which includes those residues from anthropogenic activities, with similar characteristics to the geological and biogenic components of soils that can act as source material of them through the edaphogenesis processes.

The formation of TCNS should be subject to the characteristics of the area where they are going to be applied and must incorporate types and quantities of waste to reach a suitable composition and appropriate characteristics: (1) Be fertile to develop vegetation (2) Meet the main functions of soils and (3) Suitable for solving environmental problems presents in the middle. For TCNS manufacturing material from demolition and sewage sludge of different characteristics (aerobic, anaerobic, hygienized) were used, and it was compared with the degraded Control Soil (SC). The sewage sludge was air dried and sieved through a 4 mm sieve and the demolition material was sieved through 2mm. The sludge/demolition material mixtures were made in appropriate proportions of dry weight. Field capacity of each mixture was determined with a view to incorporating in each case the optimal amount of water for stabilizing each one. To determine the suitability of different TCNS manufactured several test were carried out: texture, physic-chemical characterization (composition, consistency, pH, conductivity, total C, total N, assimilable P and total hydrocarbons), phytotoxicity and pathogens presence control. In the test conditions is possible to conclude that TCNS are more adequate material than the degraded Soil Control (SC) to vegetation growth and facilitate root penetration.



Copyright: © European Compost Network ECN e.V.
Quelle: Orbit 2014 (Juni 2014)
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Autor: Marcos Martin

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