A programme of research is being conducted in the Netherlands in the period 1990-1992 to find answers to the questions and solutions to the difficulties involved in the introduction of extensive nitrogen and phosphate removal. The purpose, organisation and implementation of the programme are considered. The most important initial results are set out relating to the clogging of aeration elements on simultaneous phosphate removal in activated sludge systems, to a guide to biological phosphate removal, phosphate stripping, the relationship between softening drinking water and phosphate removal and the market situation for chemicals for phosphate removal.

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