Abstract
In the past the paper mill Niefern GmbH had a yearly production of approximately 20 000 tons of high quality refined paper. For the purification of its wastewater in 1978 the paper mill put a mechanical/biological wastewater treatment plant into operation. Over years the conditions for the effluent concentration into the receiving water could be kept below requirements. In the course of the years the production was switched over more and more to recycling products. Therefore the hydraulic load of the wastewater treatment plant increased by 140 %, the organic load by 295 %. In order to keep the minimum requirements for the future the upgrading of the company's wastewater treatment plant became necessary. A conventional extension of the wastewater treatment plant was not possible because of the extremely restricted space. Therefore it was decided to employ a fluidized bed for the upgrading of the plant. In spring 1991 the extended wastewater treatment plant was put into operation. The company's experience within approximately 1 1/2 years showed that upgrading of water purification plants by additional use of fluidized bed systems in paper producing factories offers an ecological and convenient possibility for extension.
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