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Adding high doses of sludge to neutralize soil acidity not advisable
Date:1/8/2009

This release is available in Spanish.

Sludge obtained from water purification plants can be reused, as fertiliser for soils, for example or to reduce their acidity. The main aim of this University of the Basque Country (UPV/EHU) PhD research thesis was to study the effects of the application of EDAR (Estacin Depuradora de Aguas Residuales - Waste Water Purification Plant) waste sludge on the chemical properties of the soil and on the water filtering through it with special attention being paid to the behaviour of heavy metals. Moreover, the effects on forest plantations concretely those of Pinus radiata , have been studied.

The author of the thesis is Dr. Goio Egiarte Castaeira, who presented it with the title, Application of sewage sludge as amendment on acid forest soils. Effect on the soil-water system plan, with special attention to the behaviour of heavy metals. Dr Egiarte is an agricultural engineer currently working as a secondary school teacher. He undertook his PhD under the direction of Ms Estilita Ruiz Romera from the Department of Chemical and Environmental Engineering at the Higher School of Engineering of the UPV/EHU and Ms Marta Camps Arbestain from the Department of Agricultural Systems and Natural Resources at Neiker-Tecnalia.

When carrying out the research for the thesis, Dr. Egiarte had the help of the Dipartimento de Science Ambientali e delle Produzioni Vegetali at the Universit Politecnica delle Marche in Ancona (Italy), of the Department of Pedology and Agricultural Chemistry at Biology Faculty of the University of Santiago de Compostela (Galicia) and the Bilbao Bizkaia Water Consortium.

Suitable dose

The study approach for the thesis was particularly innovative, not only for the possible use of fertilising sludge on forest soils, but also because it studied the effect of h
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