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  • 1
    Electronic Resource
    Electronic Resource
    Effects of operating parameters on performances of nitrification and denitrification processes (2000)
    Springer
    Bioprocess engineering 23 (2000), S. 75-80 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  Nitrification and denitrification of synthetic wastewater was studied by using two reactors in series. An activated sludge unit was used for nitrification followed by a downflow biofilter (packed column) for denitrification. A glucose solution was fed to the denitrification column to supply carbon source. Effects of important process variables such as sludge age, hydraulic residence time and feed ammonium concentration on system's performance were investigated. Effluent ammonium–nitrogen (NH4–N) concentration decreased with increasing sludge age and hydraulic residence time and remained constant for sludge age and hydraulic residence times greater than 12 d and 15 h, respectively. Feed ammonium–nitrogen concentration above 200 mg/l resulted in significant levels of NH4–N in the effluent at θ c  = 15 d and θH = 12 h in nitrification. Performance of denitrification stage was not satisfactory for feed NO3–N concentrations above 150 mg N/l resulting in significant effluent NO3–N levels at hydraulic residence time of θH = 6 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004499900126
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Biological Treatment of Saline Wastewater by Fed-Batch Operation (1997)
    Chichester : Wiley-Blackwell
    Journal of Chemical Technology AND Biotechnology 69 (1997), S. 167-172 
    Details
    ISSN: 0268-2575
    Keywords: saline wastewater ; biological wastewater treatment ; fed-batch operation ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: -The adverse effects of salt on biological treatment of saline wastewater inoculated by activated sludge culture were investigated. A synthetic wastewater composed of diluted molasses, urea, KH2PO4 and various concentrations of salt (1-5% w/v NaCl) was treated in an aerobic-biological reactor operating in fed-batch mode. An activated sludge culture obtained from a wastewater treatment plant was used as the seed. Variations of chemical oxygen demand (COD) removal rate and efficiency with salt concentration were determined. A rate expression including salt inhibition effect was proposed and kinetic constants were determined by using the experimental data. © 1997 SCI.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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