Abstract
The wastewater of approx. 800 000 inhabitants and population equivalents is treated at the mechanical aeration wastewater treatment plant Düsseldorf-Nord. The dry-weather flow amounts to 145 000m3/d, of which 40 % is industrial waste water. The combined sludge-primary sludge from the mechanical part and waste-activated sludge from the final settling tanks has been anaerobically stabilized, then chemically conditioned, dewatered in filter presses and to a large extent used agriculturally. Satisfactory performance could be obtained with this type of sludge treatment and no special problems occurred. As agricultural use has become more restricted due to new laws on sludges from treatment processes, and no adequate land-fill is available, the present plant has been expanded by a multiple hearth incinerator, to minimize the sludge volume. At the same time, a centrifuge, after which the dewatered sludge is mixed with ashes, has been installed in the dewatering plant. The construction costs for the installation of the multiple hearth furnace and centrifuge were approx. 18,5 million DM.
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