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W. Firk
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Journal Articles

Integration of membrane filtration into the activated sludge process in municipal wastewater treatment

N. Engelhardt, W. Firk, W. Warnken
Water Sci Technol (1998) 38 (4-5): 429–436.
DOI: https://doi.org/10.2166/wst.1998.0686
Date Online: 01 August 1998
View articletitled, Integration of membrane filtration into the activated sludge process in municipal wastewater treatment View PDF for article titled, Integration of membrane filtration into the activated sludge process in municipal wastewater treatment
Journal Articles

Conventional and unconventional integration of trickling filters in a process for biological nutrient removal

N. Dichtl, N. Engelhardt, W. Firk, J. Koppetsch
Water Sci Technol (1994) 29 (12): 81–88.
DOI: https://doi.org/10.2166/wst.1994.0586
Date Online: 01 December 1994
View articletitled, Conventional and unconventional integration of trickling filters in a process for biological nutrient removal View PDF for article titled, Conventional and unconventional integration of trickling filters in a process for biological nutrient removal
Journal Articles

Development of a Two-Stage Treatment Plant for Extensive Nitrogen and Phosphorus Elimination

G. Bahre, W. Firk, M. Gassen
Water Sci Technol (1990) 22 (7-8): 171–179.
DOI: https://doi.org/10.2166/wst.1990.0243
Date Online: 01 July 1990
View articletitled, Development of a Two-Stage Treatment Plant for Extensive Nitrogen and Phosphorus Elimination View PDF for article titled, Development of a Two-Stage Treatment Plant for Extensive Nitrogen and Phosphorus Elimination
Journal Articles

Development and Optimization of a Process Combination of a Highest-Loaded Activated Sludge Stage and Biologically Intensified Filtration

W. Firk, N. Ghandehari
Water Sci Technol (1987) 19 (5-6): 981–992.
DOI: https://doi.org/10.2166/wst.1987.0275
Date Online: 01 May 1987
View articletitled, Development and Optimization of a Process Combination of a Highest-Loaded Activated Sludge Stage and Biologically Intensified Filtration View PDF for article titled, Development and Optimization of a Process Combination of a Highest-Loaded Activated Sludge Stage and Biologically Intensified Filtration