Sediments in Sewers

Crabtree, R. W.

doi:10.1111/j.1747-6593.1989.tb01437.x

Cited by 112 publications

(47 citation statements)

References 6 publications

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“…Results are different with the 30% concentration sludge (collected after dewatering process in a WWTP) disposed as large aggregates on the PVC plate: this type of sludge is dense enough to be detected with a well-defined water-sediment interface. Even if research objectives and experimental conditions were different, these observations are consistent with the results reported by Carnicina and Larrarte (2014) who investigated the response of the same sonar for sewer sediments of types A (compact coarse mineral material) and C (loose fine organic particles) according to the sediment classification proposed by Crabtree (1989): the type A sediment generates a signal with a different gradient profile (single gradient peak i.e. well defined interface) than type C sediment (multiple gradient peaks and less accurate determination of the interface).…”

Section: Repeatability and Uncertaintysupporting

confidence: 89%

Measurement of sewer sediments with acoustic technology: from laboratory to field experiments

Lepot

Pouzol

Borruel

et al. 2016

Urban Water Journal

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Monitoring sewer sediments is necessary to better understand sedimentation and erosion processes. Sonar is one of the available techniques to proceed to sewer sediment measurements. Extraction of numerical data, implementation of a new algorithm to identify the water-sediment interface, laboratory and field experiments have been done to evaluate the device, to quantify uncertainties and to test the sonar under various conditions. Results demonstrate that: 1) uncertainties in repeatability are less than 4%, 2) the sonar delivers accurate results under various conditions (small to large sewers and grit chambers), and 3) in situ measurements are affected by uncertainties, mainly due to the fact that the sensor is not in a fixed position but is floating on the free surface in the sewer. This device is useful and accurate for semi-automatic measurement but further research and improvements should be done to better know the position of the device in the section. ARTICLE HISTORY

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Section: Repeatability and Uncertaintysupporting

confidence: 89%

Measurement of sewer sediments with acoustic technology: from laboratory to field experiments

Lepot

Pouzol

Borruel

et al. 2016

Urban Water Journal

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“…It has been described by the study of Arthur et al (2008) that the wastewater flow/velocity determines the occurrence of sewer blockages. The wastewater quality also lead to sewer blockages which is outlined in the studies by Crabtree (1989);Mitchener & Torfs (1996);Verbanck et al (1994); Williams et al (1989) (see on section Blockages for details).…”

Section: Wastewater Transformation In Sewerage Systemsmentioning

confidence: 99%

“…624 -642 The published article can be downloaded from: http://dx.doi.org/10. 2166/wst.2012.902 solids in sewage contain soluble organic matter and the remaining FOGs which makes the solids cohesive (Crabtree 1989). Sewer pollutant transformations also contribute to the formation of cohesive solids (Verbanck et al 1994;Williams et al 1989).…”

Section: Blockagesmentioning

confidence: 99%

Impact of water source management practices in residential areas on sewer networks – a review

Marleni

Gray

Sharma

et al. 2012

Water Science and Technology

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Prolonged drought which is occurred everywhere around the world has caused water shortages, leading many countries to consider more sustainable practices which are called Source Management Practices (SMPs) to ensure water availability for the future. SMPs include the practices of water use reduction, potable water substitution and wastewater volume reduction such as water demand management, rainwater harvesting, greywater recycling and sewer mining. Besides the well known advantages from SMPs, however they also contribute to the alteration of wastewater characteristics which finally affecting the process in downstream infrastructure such as sewerage networks. Several studies have shown that the implementation of SMPs decreases the wastewater flow, whilst increasing its strength. High strength wastewater can cause sewer problems such as sewer blockage, odour and corrosion. Yet, not all SMPs and their impact on existing sewer networks have been investigated. Therefore, this study reviews some examples of four common SMPs, the wastewater characteristics and the physical and biochemical transformation processes in sewer and the problems that might caused by them and at last, the potential impacts of those SMPs on wastewater characteristics and sewer networks are discussed. This paper provides sewer system managers with an overview of potential impacts on the sewer network due to the implementation of some SMPs. Potential research opportunities for the impact of SMPs on existing sewers are also identified.

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“…Crabtree [21] describes five categories of sediment deposits, based on observations of the provenance, nature, and location of the deposits within the sewer system. Sediment deposits in The Netherlands can typically be classified as type C: mobile, fine grained deposits found in slack flow zones.…”

Section: Description Of In-sewer Defectsmentioning

confidence: 99%

Quantitative Impact Assessment of Sewer Condition on Health Risk

Bijnen

Korving

Langeveld

et al. 2018

Water

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Abstract:Due to a variety of contaminants in floodwater, exposure to urban pluvial flooding may pose a health risk to humans. In-sewer defects may cause increased pluvial flooding, possibly increasing health risks. This paper addresses the impact of in-sewer defects on urban pluvial flooding and, subsequently, on infection probabilities for humans. As such, it provides a necessary input for risk-informed sewer maintenance strategies in order to preserve the hydraulic performance of a sewer system. Critical locations in sewer networks can be safeguarded through detecting changes in hydraulic properties of the sewer system, by using monitoring equipment or alternative inspection methods. Two combined sewer systems in The Netherlands with different characteristics are studied. The catchment-wide average infection probability was calculated using Quantitative Microbial Risk Assessment (QMRA) and flooding frequencies from Monte Carlo simulations with a hydrodynamic model. For the studied catchments, it is concluded that the occurrence of flooding is significantly affected by sediment deposits and, consequently, the infection probability as well. The impact of sediment deposits on infection probabilities depends on sewer systems characteristics and varies within the catchment. The results in this paper also demonstrate that further research on the relationship between flood duration and infection probabilities is required.

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Sediments in Sewers

Cited by 112 publications

References 6 publications

Measurement of sewer sediments with acoustic technology: from laboratory to field experiments

Measurement of sewer sediments with acoustic technology: from laboratory to field experiments

Impact of water source management practices in residential areas on sewer networks – a review

Quantitative Impact Assessment of Sewer Condition on Health Risk

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