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Träfflista för sökning "WFRF:(Mikkelsen Peter Steen) srt2:(2014)"

Sökning: WFRF:(Mikkelsen Peter Steen) > (2014)

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1.
  • Nielsen, Katrine, et al. (författare)
  • Nano- and microparticles and associated pollutants in stormwater runoff : effects of disc filtration with and without flocculant addition
  • 2014
  • Ingår i: Specialist Conference. Advances in particle science and separation: from mm to nm scale and beyond. - : IWA Publishing. ; , s. 1-11
  • Konferensbidrag (refereegranskat)abstract
    • Danish municipalities work towards separating stormwater and sewage. But stormwater runoff may be heavily polluted and therefore it is needed to find Best Available Technologies (BAT) to source separate and treat stormwater before discharge into surface waters. The aim here was to determine the sizes of particles found in stormwater from roads and to evaluate the use of a cationic organic flocculant to increase the size of the particles and thereby increase the removal efficiency of a 10 μm disc filter. The samples were collected in connection with a project testing a pilot scale disc filter for treating stormwater runoff. The micro-sized particles were found to be mainly 2.1-19 μm in diameter and nano-sized particles were also observed (86-228 nm). Although the flocculant increased the observed volume of the micro-sized particles by 46%, the majority of the particles where still < 10 μm. Partial removal of particle-associate polycyclic aromatic hydrocarbons was confirmed.
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  • Ramin, Elham, et al. (författare)
  • Influence of selecting secondary settling tank sub-models on the calibration of WWTP models - A global sensitivity analysis using BSM2
  • 2014
  • Ingår i: Chemical Engineering Journal. - : Elsevier BV. - 1385-8947. ; 241, s. 28-34
  • Tidskriftsartikel (refereegranskat)abstract
    • This study investigates the sensitivity of wastewater treatment plant (WWTP) model performance to the selection of one-dimensional secondary settling tanks (1-D SST) models with first-order and second-order mathematical structures. We performed a global sensitivity analysis (GSA) on the benchmark simulation model No. 2 with the input uncertainty associated to the biokinetic parameters in the activated sludge model No. 1 (ASM1), a fractionation parameter in the primary clarifier, and the settling parameters in the SST model. Based on the parameter sensitivity rankings obtained in this study, the settling parameters were found to be as influential as the biokinetic parameters on the uncertainty of WWTP model predictions, particularly for biogas production and treated water quality. However, the sensitivity measures were found to be dependent on the 1-D SST models selected. Accordingly, we suggest a different optimum parameter selection for the calibration of WWTP models when either of the 1-D SST models is used. Using first-order models, the calibration should give equal importance to the adjustment of the hindered settling and slow settling parameter values. The adjusted hindered settling parameters have, however, no physical meaning, and might additionally obtain unrealistic values. In contrast, using second-order SST models, the focus of calibration should be on providing measured values for the hindered settling parameters. This approach is in close agreement with the recommendations made in the good modelling practice protocol on activated sludge modelling. Besides, based on the GSA results, adjusting the non-measurable slow settling parameter produces significantly less variance in the model outputs using the second-order model than using the first-order model. (C) 2013 Elsevier B.V. All rights reserved.
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