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independent fluidised-bed system have as yet not concluded the development and test phase and are not yet available for general, industrial-scale use Their use in thermal waste utilisation is, according to the current standard of knowledge, not foreseeable In the case of static fluidised-bed combustion operating under atmospheric pressure condi- tions and circulating fluidised-bed combustion, multitude of operating plants have already been realised for various fuels They were able to provide proof that atmosphericfluidised-bed combustion plants represent suitable combustion systems for coal, sewage sludge and waste materials The company-specific design variants yield four fundamental concepts for waste- technology assessments - Static fluidised-bed combustion without ash circulation ~~ , - Static fluidised-bed combustion with internal ash circulation .- Static fluidised-bed combustion with external ash circulation - Circulating fluidised-bed combustion Unequivocal and conclusive allocation of the variants offered on the market to particularfun- damental concept is hindered by the fact that there are sometimes no clear-cut distinctions distinction sufficient for comparison can be made on the basis of the gasspeed in thefluidised bed,the definable boundary betweenfluidised bed andfreespaceandthesolidsdensityin the reactor ~~ ~__ 2 Marine pollution control The German Bight, with its fairways to the German seaportsand the Kiel Canal, is one of the worlds busiest shipping routes, with approximately8,OOO vessels every year. In Fddition to the high traffic density, cross-trafficflows, difficult tidal waterways and frequent unfavourable weather conditions impede shipping in thisarea.The danger of accidents resulting from this situation, in conjunction with the high percentage of ships carrying hazardous cargo, leads to major danger potential. The majority of the hazardous cargoes consist of mineral oil and mineral oil products. Tankers wi