The erosion behaviour of biologically active sewer sediment deposits: Observations from a laboratory study

Banasiak, Robert; Verhoeven, Ronny; Sutter, Renaat De; Tait, Simon

doi:10.1016/j.watres.2005.10.011

Cited by 63 publications

(25 citation statements)

References 20 publications

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“…Despite this, the model factors h max and d 0 were found to be nearly as important with their |b i | value close to 0.1. This confirms (as also found for all model outputs, see Table 2A) the importance of the sewer sediments for the pollutant load assessment (see, among others, Ashley et al, 2000;Banasiak et al, 2005). Moreover, the result related to the model factors h max and d 0 confirms the need for accurate modelling of the sediments erosion process by considering the cohesive-like behaviour of sewer sediments (Skipworth et al, 1999).…”

Section: Src Resultssupporting

confidence: 84%

Global sensitivity analysis for urban water quality modelling: Terminology, convergence and comparison of different methods

Vanrolleghem

Mannina

Cosenza

et al. 2015

Journal of Hydrology

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a b s t r a c tSensitivity analysis represents an important step in improving the understanding and use of environmental models. Indeed, by means of global sensitivity analysis (GSA), modellers may identify both important (factor prioritisation) and non-influential (factor fixing) model factors. No general rule has yet been defined for verifying the convergence of the GSA methods. In order to fill this gap this paper presents a convergence analysis of three widely used GSA methods (SRC, Extended FAST and Morris screening) for an urban drainage stormwater quality-quantity model. After the convergence was achieved the results of each method were compared. In particular, a discussion on peculiarities, applicability, and reliability of the three methods is presented. Moreover, a graphical Venn diagram based classification scheme and a precise terminology for better identifying important, interacting and non-influential factors for each method is proposed. In terms of convergence, it was shown that sensitivity indices related to factors of the quantity model achieve convergence faster. Results for the Morris screening method deviated considerably from the other methods. Factors related to the quality model require a much higher number of simulations than the number suggested in literature for achieving convergence with this method. In fact, the results have shown that the term ''screening'' is improperly used as the method may exclude important factors from further analysis. Moreover, for the presented application the convergence analysis shows more stable sensitivity coefficients for the Extended-FAST method compared to SRC and Morris screening. Substantial agreement in terms of factor fixing was found between the Morris screening and Extended FAST methods. In general, the water quality related factors exhibited more important interactions than factors related to water quantity. Furthermore, in contrast to water quantity model outputs, water quality model outputs were found to be characterised by high non-linearity.

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Section: Src Resultssupporting

confidence: 84%

Global sensitivity analysis for urban water quality modelling: Terminology, convergence and comparison of different methods

Vanrolleghem

Mannina

Cosenza

et al. 2015

Journal of Hydrology

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“…Both strategies bring additional costs. The amount of biofilm decreases with increasing shear stress [26][27][28]. Thus, sewers with high shear stress during dry weather and sewers subject to sufficient biofilm scouring during storm events generally favor the heat exchanger installation.…”

Section: Foulingmentioning

confidence: 99%

Suitability of combined sewers for the installation of heat exchangers

Stránský

Kabelkova

Bareš

et al. 2016

Ecological Chemistry and Engineering S

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Abstract:The present paper deals with the classification of the suitability of combined sewers for the installation of heat exchangers and with assessment of the theoretical potential of wastewater in the sewer system for heating of buildings. A classification scheme involving criteria like theoretically available heat, sewer diameter, number of the heat exchanger parallel modules in the sewer cross-section, hydraulic conditions (hydraulic capacity of the sewer, pressurized flow), and potential fouling by biofilm growth was developed. First, individual sewers in the pilot catchment were assessed based on monitoring the flow characteristics and wastewater temperatures and on pipe flow modelling. Second, connectivity of the suitable and partly suitable sewers was examined with respect to the length necessary for the installation of the heat exchanger with the minimum required power of 100 kW. For the continuous sewer sections, the maximum potential power was calculated. The presented approach is generally applicable, however, for other heat exchanger types and other climatic and economic conditions, values of the suitability criteria for the heat exchanger installation must be adapted.

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“…Solids may originate from the bed as well as from boundary input from catchment surfaces. The mode of transport of solid particles in a sewer pipe can also be determined by the varying flow conditions during periods of dry and wet weather (Wotherspoon 1994 (Tait et al 2003a;Banasiak et al 2005). The terms cohesive-like or partly cohesive sediments have been used to describe deposits that display a greater resistance to erosion than it would be anticipated in regard to purely granular deposits of similar grain size (Crabtree 1989).…”

Section: Sediment Beds and Their Mobilitymentioning

confidence: 99%

The reliability of sediment transport predictions in sewers: influence of hydraulic and morphological uncertainties

Banasiak

Tait

2008

Water Science and Technology

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The paper is focussed on the concept of defining the "predictability" of sediment transport. Engineers are faced with a number of sediment transport formulas derived from different tests and described as suitable for application in sewers. Bed and suspended load formulas vary in form and performance, generally depending on the data sets that were used to calibrated them. As different sediment types have been tested no single, generally valid formula has been established so far. Formulas are distributed in the scientific literature and are often reported without the information necessary to define their range of potential applicability. Therefore, this paper along with analysing the formulas available, will also comment on the assumptions used in their development as well as the reliability of their underlying data to aid engineers in the selection of the most appropriate sediment transport formulae to correspond with the environment in which they are working.

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The erosion behaviour of biologically active sewer sediment deposits: Observations from a laboratory study

Cited by 63 publications

References 20 publications

Global sensitivity analysis for urban water quality modelling: Terminology, convergence and comparison of different methods

Global sensitivity analysis for urban water quality modelling: Terminology, convergence and comparison of different methods

Suitability of combined sewers for the installation of heat exchangers

The reliability of sediment transport predictions in sewers: influence of hydraulic and morphological uncertainties

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