A Model to Predict the Temporal Distribution of Gross Solids Loading in Combined Sewerage Systems

Digman, Christopher; Littlewood, K.; Butler, David; Spence, Kevin; Balmforth, David; Davies, John W.; Schütze, Manfred

doi:10.1061/40644(2002)102

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…It was stated that "with limited data available it is still unknown to what degree" faeces degrade in field conditions [51], this point is also clearly made by Digman et al [81] which included Butler as a co-author and looked at gross solids' loading in a combined sewage system.…”

Section: Control Of Sediment Problemsmentioning

confidence: 97%

Solid Transfer in Low Flow Sewers, the Distance Travelled So Far Is Not Enough

McDermott¹,

Strong²,

Griffiths³

2019

JEP

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Sewer blockages are on the increase whilst water closet (WC) flush volumes are on the decrease. Furthermore, Water UK reported figures show that the actual number of properties affected by sewer flooding is on the rise. Sewer blockages can lead to sewer flooding of homes and collapse of sewers which impact negatively on social, economic and environmental factors, and therefore, they are not sustainable. Water conservation is required due to water stress but reduced water use results in less water to waste, which in turn reduces solids' transfer in sewers. When considering reducing water usage through water conservation, these savings could be cancelled out by an increased population and the situation exacerbated by the impacts of climate change. There are issues in relation to varying design methods, a reliance on engineering judgement in sewer design, uncertainty relating to future water stress, and a lack of cross disciplinary design decision-making. Public health engineering solutions are needed to reduce the number of sewer blockages and the environmental impact of sewer flooding. This paper examines the fundamental research that have been carried out in the area of "solid transfer in sewers" resulting from "less water to waste" since the mid-20th Century. Contrary to existing literature, this paper identifies that, now more than ever, this type of research is needed to deal with the increased need for water conservation. To judge that solid transfer research is complete can be compared to supporting a statement that "water conservation is complete".

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Section: Control Of Sediment Problemsmentioning

confidence: 97%

Solid Transfer in Low Flow Sewers, the Distance Travelled So Far Is Not Enough

McDermott¹,

Strong²,

Griffiths³

2019

JEP

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“…Gross solids on days without rain are deposited in the bottom of the collectors, and when there is heavy rain, they are suddenly drawn into the treatment plant [8]. Numerous researchers have studied the consequences of these solids in sewage systems [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Gross Solids Content Prediction in Urban WWTPs Using SVM

Pérez

Fernández

et al. 2021

Water

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The preliminary treatment of wastewater at wastewater treatment plants (WWTPs) is of great importance for the performance and durability of these plants. One fraction that is removed at this initial stage is commonly called gross solids and can cause various operational, downstream performance, or maintenance problems. To avoid this, data from more than two operation years of the Villapérez Wastewater Treatment Plant, located in the northeast of the city of Oviedo (Asturias, Spain), were collected and used to develop a model that predicts the gross solids content that reaches the plant. The support vector machine (SVM) method was used for modelling. The achieved model precision (Radj2 = 0.7 and MSE = 0.43) allows early detection of trend changes in the arrival of gross solids and will improve plant operations by avoiding blockages and overflows. The results obtained indicate that it is possible to predict trend changes in gross solids content as a function of the selected input variables. This will prevent the plant from suffering possible operational problems or discharges of untreated wastewater as actions could be taken, such as starting up more pretreatment lines or emptying the containers.

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“…This has been integral to the development of and the input data requirements for the computational model GROSSim (Digman et al, 2002). This model for the first time can estimate the gross solids loading in combined sewer networks during dry and wet weather, with deposition and re-entrainment being important aspects.…”

Section: Practical Applicationsmentioning

confidence: 99%

“…Solids' transport in truncated parts of the network is managed within GROSSim using a non-linear reservoir model (Digman et al, 2002) at each node where truncation occurs. Input of solids at each node in GROSSim is in the form of a "solidograph", where the rate varies with time of day.…”

Section: Introductionmentioning

confidence: 99%