The Rotterdam-Dokhaven Sewage Treatment Plant (STP) is operational since July 1987.With a biological capacity of 470,000 population equivalents it is not nearly the largest STP in the Netherlands. But an underground sewage treatment plant with a city park on top, in the midst of a developing residential quarter is very unusual. The designers had to be innovative in order to meet the severe environmental requirements based on the Nuisance Act. The plant is characterised by extensive ventilation facilities, a two-step activated sludge process: A-B system, application of PVC-lining on large-scale to prevent concrete corrosion, a separate sludge handling site where the washed ventilation air is expelled by a chimney stack.

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