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Prof.dr.ir. P.N.L. Lens

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  • Anaerobic methanethiol degradation in upflow anaerobic sludge bed reactors at high salinity (> 0.5 M Na+) (2007)

    Authors:Leerdam, van R.C.; Bok, de F.A.M.; Lens, P.N.L.; Stams, A.J.M.; Janssen, A.J.H.
    In:Biotechnology and Bioengineering, 98(1), 91 - 100. ISSN 0006-3592.

    Abstract:

    The feasibility of anaerobic methanethiol (MT) degradation at elevated sodium concentrations was investigated in a mesophilic (30°C) lab-scale upflow anaerobic sludge bed (UASB) reactor, inoculated with estuarine sediment originating from the Wadden Sea (The Netherlands). MT was almost completely de

  • Effect of hydraulic retention time on sulfate reduction in a carbon monoxide fed thermophilic gas lift reactor (2007)

    Authors:Sipma, J.; Osuna, M.B.; Lettinga, G.; Stams, A.J.M.; Lens, P.N.L.
    In:Water Research, 41(9), 1995 - 2003. ISSN 0043-1354.

    Abstract:

    Thermophilic hydrogenogenic carbon monoxide (CO) converting microorganisms present in anaerobic sludge play a crucial role in the application of CO as electron donor for sulfate reduction. Hydrogenogenic CO conversion was investigated in a gas lift reactor (55 °C) at different hydraulic retention ti

  • Induction of cobalt limitation in methanol fed UASB reactors (2006)

    Authors:Zandvoort, M.H.; Hullebusch, van E.D.; Golubnic, S.; Gieteling, J.; Lens, P.N.L.
    In:Journal of Chemical Technology and Biotechnology, 81(9), 1486 - 1495. ISSN 0268-2575.

    Abstract:

    The effect of long-term deprivation of all trace elements or solely cobalt on methanol conversion in upflow anaerobic sludge bed (UASB) reactors inoculated with a nickel-limited sludge was investigated. Two UASB (30 ¿C, pH 7) reactors were operated at organic loading rates of up to 17.6 g chemical o

  • Cobalt sorption onto anaerobic granular sludge: Isotherm and spatial localization analysis (2006)

    Authors:Hullebusch, van E.D.; Gieteling, J.; Zhang, M.; Zandvoort, M.H.; Daele, van W.; Defrancq, J.; Lens, P.N.L.
    In:Journal of Biotechnology, 121(2), 227 - 240. ISSN 0168-1656.

    Abstract:

    This study investigated the effect of different feeding regimes on the cobalt sorption capacity of anaerobic granular sludge from a full-scale bioreactor treating paper mill wastewater. Adsorption experiments were done with non-fed granules in monometal (only Co) and competitive conditions (Co and N

  • Granular sludge in full scale anaerobic bioreactors: trace element content and deficiencies (2006)

    Authors:Zandvoort, M.H.; Hullebusch, van E.D.; Gieteling, J.; Lens, P.N.L.
    In:Enzyme and Microbial Technology, 39(2), 337 - 346. ISSN 0141-0229.

    Abstract:

    To study whether trace element limitations are present in methanogenic granular sludge from full-scale anaerobic bioreactors, four different anaerobic granular sludges (Nedalco, Eerbeek, Hoogeveen and Heineken) were screened for their metal content and their response to the addition of a metal cockt

  • Electrokinetic copper and iron migration in anaerobic granular sludge (2006)Open access

    Authors:Virkutyte, J.; Sillanpää, M.J.; Lens, P.N.L.
    In:Water Air and Soil Pollution, 177(1-4), 147 - 168. ISSN 0049-6979.

    Abstract:

    The application of low-level direct electric current (0.15 mA cm¿2) as an electrokinetic technique to treat copper-contaminated mesophilic anaerobic granular sludge was investigated. The sludge was obtained from a full scale UASB reactor treating paper-mill wastewater and was artificially contaminat

  • Preface (2006)Open access

    Authors:Lens, P.N.L.; Egli, T.
    In:Biodegradation, 17(2), 1 - 2. ISSN 0923-9820.

  • Dispersed plug flow model for upflow anaerobic sludge bed reactors with focus on granular sludge dynamics (2006)Open access

    Authors:Kalyuzhnyi, S.V.; Fedorovich, V.V.; Lens, P.N.L.
    In:Journal of Industrial Microbiology and Biotechnology, 33(3), 221 - 237. ISSN 1367-5435.

    Abstract:

    A new approach to model upflow anaerobic sludge bed (UASB)-reactors, referred to as a one-dimensional dispersed plug flow model, was developed. This model focusses on the granular sludge dynamics along the reactor height, based on the balance between dispersion, sedimentation and convection using on

  • Degradation of Methanethiol by Methylotrophic Methanogenic Archaea in a Lab-Scale Upflow Anaerobic Sludge Blanket Reactor (2006)

    Authors:Bok, de F.A.M.; Leerdam, van R.C.; Lomans, B.P.; Smidt, H.; Lens, P.N.L.; Janssen, A.J.H.; Stams, A.J.M.
    In:Applied and Environmental Microbiology, 72(12), 7540 - 7547. ISSN 0099-2240.

    Abstract:

    In a lab-scale upflow anaerobic sludge blanket reactor inoculated with granular sludge from a full-scale wastewater treatment plant treating paper mill wastewater, methanethiol (MT) was degraded at 30°C to H2S, CO2, and CH4. At a hydraulic retention time of 9 h, a maximum influent concentration of 6

  • Use of biogenic sulfide for ZnS precipitation (2006)

    Authors:Esposito, G.; Veeken, A.; Weijma, J.; Lens, P.N.L.
    In:Separation and Purification Technology, 51(1), 31 - 39. ISSN 1383-5866.

    Abstract:

    A 600 ml continuously stirred tank reactor was used to assess the performance of a zinc sulfide precipitation process using a biogenic sulfide solution (the effluent of a sulfate-reducing bioreactor) as sulfide source. In all experiments, a proportional-integral (PI) control algorithm was used to co

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