1
Iman W Koster, Abraham Klapwijk: Method and apparatus for processing manure. Ecotechniek, Harness Dickey & Pierce, March 1, 1994: US05290451 (67 worldwide citation)

The invention relates to a method for processing manure, liquid manure and/or Kjeldahl-N containing waste water being subjected to a nitrification in an aerated reactor containing active sludge and to a denitrification in a high rate recirculation denitrification reactor (13) containing a very compa ...


2
Abraham Klapwijk, Gatze Lettinga: Process for removing organic substances and nitrogen compounds from waste water. Stamicarbon, Cushman Darby & Cushman, January 15, 1980: US04183809 (48 worldwide citation)

An improved process for the removal of organic substances and nitrogen compounds from waste water by means of micro-organisms, wherein waste water to be treated is passed continuously through a denitrification zone, effluent from the denitrification zone is passed into a nitrification zone, and at l ...


3
Iman W Koster, Abraham Klapwijk: Method for processing manure, fermented manure and ammonium nitrogen containing waste water. Ecotechniek, Harness Dickey & Pierce, March 22, 1994: US05296147 (15 worldwide citation)

The invention relates to a method for processing manure, fermented liquid manure being subjected to nitrification in a first step and to denitrification in a subsequent step, an aerated reactor which contains active sludge rich in nitrifying bacteria being used in the nitrification step and acid-neu ...


4
George S Solt, Abraham Klapwijk: Process for reducing the nitrate content in water. Silverman Cass Singer & Winburn, June 9, 1987: US04671879 (6 worldwide citation)

The present invention provides a process for reducing the nitrate content in water, wherein water containing nitrate is contacted with an anion exchanger containing chloride and/or bicarbonate ions to remove the nitrate, whereafter the exhausted anion exchanger is regenerated, the spent eluate eithe ...


5
Abraham Klapwijk, Henricus L F M Spanjers: Method for determining the respiration rate of a respiring material in the form of a continuous process current, as well as a device suitable for such an application. Ecotechniek, Harness Dickey & Pierce, May 21, 1991: US05017496 (5 worldwide citation)

Method and device for determining the respiration rate of a respiring material such as active sludge in a continuous process flow before and after holding thereof in a respiration chamber. The oxygen content in the continuous process current is done at a single measurement point. This is done by rev ...


6
Iman W Koster, Abraham Klapwijk: Installation for processing manure, fermented manure and Kjeldahl-N containing waste water. Ecotechniek, Harness Dickey & Pierce, August 3, 1993: US05232583 (1 worldwide citation)

The invention relates to a method for processing manure, fermented liquid manure being subjected to nitrification in a first step and to denitrification in a subsequent step, an aerated reactor which contains active sludge rich in nitrifying bacteria being used in the nitrification step and acid-neu ...



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