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Biochar as amendment for trace elements contaminated soils: The Guadiamar case study

AuthorsCampos Díaz de Mayorga, Paloma; López Núñez, Rafael ; Fernández Boy, E.; Knicker, Heike ; Rosa Arranz, José M. de la
KeywordsSoil remediation
Agricultural residues
Trace elements
Issue Date16-Jul-2018
CitationLandcare for the future: Book of Abstracts pág. 42 (2018)
AbstractThe tailing-dam spill of Aznalcóllar (SW, Spain) mine on 1998 poured 4.5 Hm3 of acid water and toxic sludges on the banks of the river Guadiamar and affected 4286 ha of the soils located downriver. Despite the non-precedent cleaning works performed to remove the contaminated soils, over 200 Ha of soils are still unrecovered and the contamination due the high concentration of some persistent elements is present in the subsurface layers. The major goal of BioReMeC project (CGL2016-76498-R) is to test the efficiencyof biochar from agricultural residues as a tool in the restoration of soils contaminated with trace elements. Biochar is the solid material rich in aromatic, low density carbon produced through the pyrolysis of residual biomass. In this session I would like to present the preliminary results of my PhD thesis, which is performed in the framework of of the projects BioRemeC and CarboPeat. In the first step, biochars were produced using 4 agricultural residues as feedstock: rice husk, pruned olive trees, olive pit and ¿alperujo¿ (a byproduct of the olive oil). Biochars were produced with temperatures ranging between 350 and 600ºC whereas reaction time ranged from 0.5 to 4h. In general pH, water holding capacity (WHC), aromaticity determined by solid-state 13C NMR spectroscopy and carbon content of biochars increased significantly when pyrolysis temperature was elevated from 400 to 600ºC. The WHC and N content were highly influenced by feedstock. In the second step, the remediation potential of the most suitable biochars was tested in the mentioned soil (Typic Xerofluvent from Aznalcóllar). The contaminated soils were mixed with the selected biochars (rice husk and olive pit biochars produced at 400 or 500ºC for 1 or 4 hours) and incubated during 60 days (25ºC, 60% WHC). Subsequently, germination rates (Brassica rapa pekinensis), enzymatic activities and the bioavailability of selected trace elements were determined. Biochar increased soil pH and plant germination rates. Additionally, a field experiment is being carried out in the ¿Corredor Verde del Guadiamar¿ to study the restoration capacity of the biochars over trace elements contaminated soils
DescriptionComunicación oral presentada en Landcare for the future. Book of Abstracts, Santiago de Compostela (La Coruña), July 16-18, 2018
Appears in Collections:(IRNAS) Comunicaciones congresos
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