Importance

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Abstract

The invention relates to a method and an arrangement for enabling a contaminated medium to be cleansed in a contact reactor by introducing thereinto a pulverulent absorption material capable of reacting with contaminants in the medium, the medium and the absorption material being mixed together in the contact reactor over a period of time in which contaminants react with the material, therewith to absorb on and react with individual particles in the pulverulent absorption material. The method includes the steps of: (a) removing absorption material partly reacted with contaminants downstream of the contact reactor; (b) storing this removed absorption material for a pre-determined time duration in excess of 20 hours; (c) causing the contaminants to diffuse inwardly into respective individual particles during this storage time, thus to impart to the surfaces of the particles an increased ability to absorb further contaminants; and (d) returning stored, previously used absorption material to the contact reactor as a pulverulent absorption material capable of reacting with the contaminants contained in the medium.

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First Claim