| 1. |
- Villez, K, et al.
(författare)
-
Comparison of two wavelet-based tools for data mining of urban water networks time series
- 2007
-
Ingår i: Water Science and Technology. - : IWA Publishing. - 0273-1223 .- 1996-9732. ; 56:6, s. 57-64
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper, two approaches to data mining of time series have been tested and compared. Both methods are based on the wavelet decomposition of data series and allow the localization of important characteristics of a time series in both the time and frequency domain. The first method is a common method based on the analysis of wavelet power spectra. The second approach is new to the applied field of urban water networks and provides a qualitative description of the data series based on the cubic spline wavelet decomposition of the data. It is shown that wavelet power spectra indicate important and basic characteristics of the data but fail to provide detailed information of the underlying phenomena. In contrast, the second method allows the extraction of more and more detailed information that is important in a context of process monitoring and diagnosis
|
|
| 2. |
- Carstensen, J., et al.
(författare)
-
Objective Functions for Wastewater Treatment Design and Operation
- 1995
-
Ingår i: COST 682 Environment: Optimizing the Design and Operation of Biological Wastewater Treatment Plants through the use of Computer Programmes based on Dynamic Modelling of the Process: Report 1992-95. - 9282743446 ; , s. 105-108
-
Bokkapitel (refereegranskat)
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
|
|
| 6. |
- Olsson, Gustaf, et al.
(författare)
-
Instrumentation, control and automation in wastewater – from London 1973 to Narbonne 2013
- 2014
-
Ingår i: Water Science and Technology. - : IWA Publishing. - 0273-1223 .- 1996-9732. ; 69:7, s. 1373-1385
-
Tidskriftsartikel (refereegranskat)abstract
- Key developments of instrumentation, control and automation (ICA) applications in wastewater systems during the past 40 years are highlighted in this paper. From the first ICA conference in 1973 through to today there has been a tremendous increase in the understanding of the processes, instrumentation, computer systems and control theory. However, many developments have not been addressed here, such as sewer control, drinking water treatment and water distribution control. It is hoped that this review can stimulate new attempts to more effectively apply control and automation in water systems in the coming years.
|
|
| 7. |
|
|
| 8. |
|
|
| 9. |
|
|
| 10. |
- Bürger, Raimund, et al.
(författare)
-
Numerical solution of a multi-class model for batch settling in water resource recovery facilities
- 2017
-
Ingår i: Applied Mathematical Modelling. - : Elsevier BV. - 0307-904X. ; 49, s. 415-436
-
Tidskriftsartikel (refereegranskat)abstract
- In Torfs et al. (2017) a new unified framework to model settling tanks in water resource recovery facilities was proposed providing a set of partial differential equations (PDEs) modelling different settling unit processes in wastewater treatment such as primary and secondary settling tanks (PSTs and SSTs). The extension to a multi-class framework to deal with the distributed properties of the settling particles leads to a system of non-linear hyperbolic-parabolic PDEs whose solutions may contain very sharp transitions. This necessitates the use of a consistent and robust numerical method to obtain well-resolved and reliable approximations to the PDE solutions. The use of implicit–explicit Runge–Kutta (IMEX-RK) schemes, along with the weighted essentially non-oscillatory (WENO) shock-capturing technology for the discretization of the set of equations, is advocated in this work. The versatility of the proposed unified framework is demonstrated through a set of numerical examples for batch settling occurring in both PSTs and SSTs, along with the efficiency and reliability of the numerical scheme.
|
|
