charcoal adsorption as a result of the use of small particles substantial reduction in the contact time required for regeneration as a consequence of the short path for diffusion of oxidizing agent to the adsorption site and the lack of the need for complete oxidation of all organic constituents in a single step to co 2 h 2 o salts the possibility of carrying out the oxidative regeneration in a much more attractive concentration range as a result of the concentration step with as a consequence a reduction in the quantity of oxidizing agent required a compact set up which is also suitable for relatively small applications in contrast to large scale processes for regeneration and the associated high capital investment within the framework of the invention a number of variants are of course possible for example in respect of the techniques used for concentration of the adsorbent particles loaded with metallo organic components conceivable techniques in this context are the use of conventional filters membrane filtration systems hydrocyclones centrifuges magnetic systems continuous sand filters and other techniques for the removal of particles from liquid streams a feed stream which contains 0 06 mmol l caffeine is brought into contact with powdered charcoal norit type w35 and after a reaction time of u2248 30 seconds is passed over a polymer hollow fibre module romicon type hfl 45 xm50 mwco 50 000 d no caffeine can be detected in the permeate which corresponds to a caffeine concentration of lt 0 001 mmol liter during concentration of the powdered charcoal suspension from 0 1 by weight to 15 by weight the flow.