Process for reducing levels of contamination of soils polluted by DDT, DDE, DDD and/or isomers thereof

摘要

This invention relates to a process for reducing the levels of contamination of soils polluted by DDT, DDE, DDD and/or their isomers which comprises the steps of:
(i) excavating the polluted soil;
(ii) sieving the excavated soil to separate out a first part with particle size measurement less than a predetermined threshold value;
(iii) adding to a predetermined quantity of the first part of sieved polluted soil a first aqueous solution containing one or more enzymes in such a way as to obtain a solid - liquid mass;
(iv) stirring the solid - liquid mass for a predetermined time so that said one or more enzymes catalyse the partial or total degradation of said pollutant; and
(v) separating the solid - liquid mass into a residual aqueous suspension and into a solid part.