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Befesa awarded the contract to manage 20,000 tons of sludge from Repsol Petróleo, S.A.

Befesa Gestión de Residuos Industriales has been awarded the contract for the external management of 20,000 tons of centrifuged sludge from the wastewater treatment plant at the Industrial Complex of Repsol Petróleo, S.A., in Puertollano, in the province of Ciudad Real.

The waste to be managed consists of a mixture of biological sludge generated due to the degradation of the organic compounds present in the effluent and primary sludge originating from the separation of effluents from the settled matter.

The contract signed by Befesa Gestión de Residuos Industriales and Repsol Puerto Llano, includes the loading, transportation and final treatment of the sludge by means of its disposal in an authorized deposit. The in situ sludge inerting process will be the responsibility of Repsol Petróleo, S.A., who must give Befesa the assurance that the resulting waste complies with the required parameters in order that it may be managed as a non-hazardous waste, given that financial management cost savings are made in this way.

The inerting process is a pretreatment process aimed at isolating the wastes. It consists of the forming of a protection layer that prevents the sludge from coming into contact with other wastes upon it being disposed of in authorized deposits and which would thereby react and alter its physicochemical or biological properties. The acceptance parameters the wastes must meet to be inerted are: hotspot higher than 55oC, inexistence of free liquid, must not contain cyanides, and in the event of them being waters, they must be neither acids nor basics.

Befesa currently manages three inerting facilities, in Nerva (Huelva), Cartagena (Murcia) and Albega (Huelva). The first two, owned by Befesa, favor final disposal in safety deposits while the third, co-owned with Egmasa, favors a more ecological final disposal given that its aim is soil recovery.