combined sewer overflow Articles
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Project - Northumbrian Water
Project Description Northumbrian Water provides water and sewerage services to 2.7 million people in the North East of England with 27,000 km of sewers and cleared 9500 blockages in 2019. StormHarvester and Northumbrian Water have worked together since early 2018 to analyse pumping chambers in Newcastle-Upon-Tyne in Northern England. This discrete network was chosen due to the location of ...
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EPA initiates strategic planning for priority enforcement areas, but key elements still needed
OECA has instituted a process for strategic planning in its national enforcement priority areas. It has developed strategic planning guidance and a strategy template to facilitate continual review and improvement of the strategies. The Fiscal Years 2008-2010 strategic plans we reviewed, for air toxics, combined sewer overflows, and mineral processing, contain an overall goal, a problem statement, ...
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Washoff behavior of in-sewer deposit in combined sewer system through artificial flushing experiment
In-sewer deposits in combined sewer systems (CSSs) are closely related with the behavior of first foul flush and combined sewer overflows. However, the research paying attention to the role of in-sewer deposits is quite rare, furthermore, their contributions for the washoff patterns of each pollutant including pathogenic microorganisms are almost never discussed so far. The artificial flushing ...
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An application of Austrian legal requirements for CSO emissions
The Austrian standard for designing combined sewer overflow (CSO) detention basins introduces the efficiency of the combined sewer overflows as an indicator for CSO pollution. Additionally criteria for the ambient water quality are defined, which comprehend six kinds of impacts. In this paper, the Austrian legal requirements are described and discussed by means of hydrological modelling. This is ...
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Development and testing of a new design procedure for the control of aesthetic pollutants at combined sewer overflows
ABSTRACTTwo research projects identified the need for a new design guide and software to facilitate the design of combined sewer overflows. The purpose of the design guide and software is to enable the selection of the most cost effective arrangement of overflow and screens according to local circumstances. Strategies were developed to minimise the risk of those testing the design guide and ...
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Experimental study of the performance of a siphon sediment cleansing set in a CSO chamber
Model experiments were conducted to investigate the performance of a siphon sediment cleansing set (SSCS) for preventing sediment deposition on the combined sewer overflow (CSO) chamber bottom. The results confirmed the effectiveness of siphon suction in sediment removal in the chamber. The sediment scour test revealed that the equilibrium scour depth correlated significantly with the ...
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Evaluation of effectiveness of combined sewer overflow control measures by operational data
The effect of combined sewer overflow (CSO) control measures should be validated during operation based on monitoring of CSO activity and subsequent comparison with (legal) requirements. However, most CSO monitoring programs have been started only recently and therefore no long-term data is available for reliable efficiency control. A method is proposed that focuses on rainfall data for ...
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The use of CFD modelling to optimise measurement of overflow rates in a downstream-controlled dual-overflow structure
The measurement of the flow through complex combined sewer overflow structures in the frame of automated monitoring remains difficult. In this paper, a methodology based on the use of computational fluid dynamics (CFD) modelling in order to improve the instrumentation of a downstream-controlled dual-overflow structure is presented. The dual-overflow structure is composed of two combined sewer ...
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Research of trace metals as markers of entry pathways in combined sewers
Combined sewers receive high toxic trace metal loads emitted by various sources, such as traffic, industry, urban heating and building materials. During heavy rain events, Combined Sewer Overflows (CSO) can occur and, if so, are discharged directly into the aquatic system and therefore could have an acute impact on receiving waters. In this study, the concentrations of 18 metals have been ...
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Emission predictions with a multi-linear reservoir model
ABSTRACTFor the assessment of combined sewer overflows detailed models are not necessary. Physically based conceptual models give an optimal balance between model uncertainty and uncertainty in the input data. Besides, it is important that continuous long term simulations are performed. To prove this, in this paper the calibration of a reservoir model is discussed. The emission results of the ...
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Determination of the vertical velocity distribution of floatables in CSOs
ABSTRACTControl of floatables, since April 1994, is one of the nine minimum controls required by the U.S.EPA (United States Environmental Protection Agency) for CSO (Combined Sewer Overflows) control policy compliance. Municipalities must control and intercept floatables at their overflow sites. Efficient interception of these floatables requires prior characterisation. To accomplish this ...
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Flow measurements in sewers based on image analysis: automatic flow velocity algorithm
Discharges of combined sewer overflows (CSOs) and stormwater are recognized as an important source of environmental contamination. However, the harsh sewer environment and particular hydraulic conditions during rain events reduce the reliability of traditional flow measurement probes. An in situ system for sewer water flow monitoring based on video images was evaluated. Algorithms to determine ...
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CSO management from an operator's perspective: a step-wise action plan
Combined sewer overflows (CSO) are the “ugly ducklings” of urban wastewater infrastructure, rather unknown, rarely loved. Contrary to wastewater treatment plants (WWTP) where, commonly, process parameters are carefully registered, still relatively little is known about the spill behaviour of CSOs. In spite of the considerable bandwidth of pollution magnitude reported in literature, it can be ...
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Analysing urban floods and combined sewer overflows in a changing climate
Climate change is expected to lead to an increased frequency and intensity of extreme precipitation events. For urban drainage, the primary adverse effects are more frequent and severe sewer overloading and flooding in urban areas, and higher discharges through combined sewer overflows (CSO). For assessing the possible effects of climate change, urban drainage models are run with ...
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EMS’ Marco Eulogi submits PhD thesis on benefits of the CENTAUR system
EMS’ Marco Eulogi recently submitted his PhD thesis, in which he demonstrated the benefits of the CENTAUR system through simulations. CENTAUR is a local real-time control (RTC) system, capable of mitigating urban flooding and combined sewer overflow spills. Marco successfully demonstrated the potential benefits of urban drainage systems, in increasing network performance to avoid spills, ...
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Chemical pretreatment of combined sewer overflows for improved UV disinfection
The aim of this research was to better understand chemical pre-treatment of combined sewer overflows (CSOs) for subsequent ultraviolet (UV) disinfection. Approximately 200 jar tests were completed. Alum (Al2(S04)3·12H2O) resulted in a higher UV light transmission (UVT), and equivalent total suspended solids (TSS) removal, than ferric chloride (FeCl3). An alum dose of 20 mg/L increased the UVT ...
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Modeling climate change impacts on combined sewer overflow using synthetic precipitation time series
In the presented study climate change impacts on combined sewer overflows (CSOs) in Baden-Wuerttemberg, Southern Germany, were assessed based on continuous long-term rainfall–runoff simulations. As input data, synthetic rainfall time series were used. The applied precipitation generator NiedSim-Klima accounts for climate change effects on precipitation patterns. Time series for the past ...
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Priority substances in combined sewer overflows: case study of the Paris sewer network
This study was undertaken to supply data on both priority pollutant (PP) occurrence and concentrations in combined sewer overflows (CSOs). A single rain event was studied on 13 sites within the Paris sewer network. For each sample, a total of 66 substances, including metals, polycyclic aromatic hydrocarbons (PAHs), pesticides, organotins, volatile organic compounds, chlorobenzenes, phthalates and ...
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Project - Wessex Water - Using AI to Detect Early Blockage Formations in Wastewater Networks
1. Background. Wessex Water provides water and sewerage services to 2.8million people in the South West of England with 35,000km of sewers, clearing approximately 13,000 blockages a year at a cost of £5m annually. In May 2020, amongst strong international competition, StormHarvester became a successful finalist in a 3 month smart sewer trial with Wessex Water in the city of Bath wastewater ...
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Constructed wetlands for combined sewer overflow treatment in a Mediterranean country, Portugal
The use of constructed wetlands as a valuable and attractive method for combined sewer overflow (CSO) treatment has been demonstrated in several studies. In Portugal, a Mediterranean country having usually a long dry period, there are still no applications of this technology. The purpose of this research is to gather information and know-how required for the design and management of this type ...
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