Sewer Overflow Monitoring Articles on Environmental XPRT

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 ...

Jan. 1, 2011

By IWA Publishing

Report to Congress: Combined Sewer Overflows to the Lake Michigan Basin

The U.S. Environmental Protection Agency (EPA) is transmitting this Report to Congress on combined sewer overflows (CSOs) in the Lake Michigan basin. CSOs can occur in combined sewer systems (CSSs), which are defined as collection systems that carry both wastewater and storm water in the same pipe. A CSO is defined as “the discharge from a CSS at a point prior to the publicly-owned treatment ...

Nov. 22, 2007

By US EPA - Environmental Protection Agency

Micropollutants in stormwater runoff and combined sewer overflow in the Copenhagen area, Denmark

Stormwater runoff contains a broad range of micropollutants. In Europe a number of these substances are regulated through the Water Framework Directive, which establishes Environmental Quality Standards (EQSs) for surface waters. Knowledge about discharge of these substances through stormwater runoff and combined sewer overflows (CSOs) is essential to ensure compliance with the EQSs. Results from ...

Jan. 1, 2011

By IWA Publishing

Municipal sewer remote monitoring

Sewers are critical heavy duty infrastructure components requiring costly maintenance. Many municipalities suffer from ageing pipelines that pose higher chances of failure. Sewer leak or overflow results in high cost as a result of civil reimbursement and due to inflected illness. Moreover Civilian frustration that results form the overflow is often targeted towards the municipality. Overflow can ...

Jul. 27, 2009

By Solid Applied Technologies Ltd. (SolidAT)

Innovative monitoring of combined sewer overflow (CSO) quality in the Liguori catchnment (Cosenza, Italy)

Estimates of urban wet-weather flow pollutant loads are required to assess their impact on receiving waters and optimize wastewater treatment plant (WWTP) and combined sewer overflow (CSO) operations. In particular, a quantitative characterization of flow quality by means of fairly accurate monitoring is required for developing a rational planning approach and preferential treatment strategies. ...

Sep. 25, 2012

By IWA Publishing

Modelling of <italic>E. coli</italic> distribution in coastal areas subjected to combined sewer overflows

Modelling of E. coli distribution in coastal areas subjected to combined sewer overflows

Rivers, lakes and the sea were the natural receivers of raw urban waste and storm waters for a long time but the low sustainability of such practice, the increase of population and a renewed environmental sensibility increased researcher interest in the analysis and mitigation of the impact of urban waters on receiving water bodies (RWB). In Europe, the integrated modelling of drainage systems ...

Sep. 16, 2013

By IWA Publishing

Model evaluation of faecal contamination in coastal areas affected by urban rivers receiving combined sewer overflows

Odaiba seaside park is one of the most popular waterfronts in Tokyo Bay, but is easily affected by wet weather pollutant loads through combined sewer overflows (CSOs). The monitoring data of Escherichia coli clearly showed high faecal contamination after a rainfall event on 9–11 November 2007. We estimated the amounts of discharge volume and E. coli pollutant loads of ...

Aug. 7, 2014

By IWA Publishing

Determining Water Quality Impacts of Combined Sewer Overflow on the Mississippi River Using Full Factorial Analysis

ABSTRACTThe City of Rock Island, Illinois is completing a Combined Sewer Overflow Long Term Control Plan as part of a Consent Decree with the U.S. EPA. The Consent Decree includes a requirement that Rock Island document existing water quality so that CSO impacts could be identified and potential improvements with various CSO could be assessed. Because of complex river morphology, large flow rate ...

Oct. 22, 2006

By Water Environment Federation (WEF)

The semi-sewer river: hydraulic backwater effects and combined sewer overflow reverse flows in Central Brussels reduce deoxygenation impact further downstream

In 2011 and 2012 the dissolved oxygen content in the low-discharge river Zenne was monitored continuously, every 5 minutes, downstream of Brussels city centre, making it possible to document the complex mechanisms by which combined sewer overflow (CSO) spills affect both the hydraulics and the oxygen balance of the hydrosystem. In addition to oxygen demand impacts, proportions of water volumes ...

Feb. 26, 2014

By IWA Publishing

Predicting combined sewer overflows chamber depth using artificial neural networks with rainfall radar data

Combined sewer overflows (CSOs) represent a common feature in combined urban drainage systems and are used to discharge excess water to the environment during heavy storms. To better understand the performance of CSOs, the UK water industry has installed a large number of monitoring systems that provide data for these assets. This paper presents research into the prediction of the hydraulic ...

Mar. 19, 2014

By IWA Publishing

The Use of Computational Flow Modeling to Determine Disinfection Efficacy of an Advanced Hydrodynamic Vortex Combined Sewer Overflow Treatment System

The ProblemA number of cities in Northeastern US are investigating the installation of new combined sewer overflow (CSO) treatment units utilizing an Advanced Hydrodynamic Vortex Separator (HDVS) with a self-cleansing screen. Hydrodynamic Vortex systems have traditionally been utilized as high-rate solids liquid separators and only recently have their potential use as contact chambers for ...

Oct. 21, 2006

By Water Environment Federation (WEF)

World’s largest compressible media filtration plant eliminates combined sewer overflows, with potential for dry-weather use

The City of Springfield, Ohio, recently opened its 100 MGD enhanced high-rate treatment facility, designed to treat and disinfect combined high-volume stormwater and wastewater flows generated by wet-weather conditions. Utilizing EPA-documented Compressible Media Filtration technology – FlexFilter™ from WesTech – the system can also provide tertiary filtration and disinfection ...

Mar. 22, 2016

By WesTech Engineering, Inc.

Performance assessment of a vertical flow constructed wetland treating unsettled combined sewer overflow

The performance of a vertical flow constructed wetland for combined sewer overflow treatment (CSO CW) has been evaluated. The full-scale site has been monitored for 3 years for major pollutants and for two load events for a range of micropollutants (metals, metalloids and polycyclic aromatic hydrocarbons (PAHs)). Performance were predominantly high (97% for total suspended solids (TSS), 80% ...

Mar. 4, 2017

By IWA Publishing

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 ...

Jan. 1, 2011

By IWA Publishing

Modeling storage capacity in Amsterdam’s sewer system

About Waternet Waternet is a joint executive within the Amsterdam City Council and the regional management board Amstel, Gooi en Vecht, undertaking strategy, policy, design, planning, projects and administration for wastewater, groundwater and potable water. The organization controls 12 wastewater treatment plants, 3,500km of stormwater and wastewater pipelines, 500km of pressure pipes, ...

Dec. 2, 2010

By Innovyze

Pulsar`s Blackbox 136 Level CSO Controller provides an immediate view of sewage overflow events in Ljubljana, Slovenia

Slovenia's largest water distribution and waste water disposal company, Javno podjetje Vodovod-Kanalizacija d.o.o. Ljubljana, invited Pulsar distributor, MIMOS, to help gather information of sewage overflow events along local rivers. By using a combination of MIMOS software, ...

May 27, 2014

By Pulsar Process Measurement Ltd

Assessment of erosion and sedimentation dynamic in a combined sewer network using online turbidity monitoring

Eroded sewer sediments are a significant source of organic matter discharge by combined sewer overflows. Many authors have studied the erosion and sedimentation processes at the scale of a section of sewer pipe and over short time periods. The objective of this study was to assess these processes at the scale of an entire sewer network and over 1 month, to understand whether phenomena observed ...

Jul. 7, 2015

By IWA Publishing

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 ...

Jan. 1, 2011

By IWA Publishing

Performance assessment of separate and combined sewer systems in metropolitan areas in southern China

To assess the performance of urban drainage systems in metropolitan areas in southern China, 12 urban drainage systems, including nine separate sewer systems (SSSs) and three combined sewer systems (CSSs) were monitored from 2008 to 2012 in Shanghai and Hefei. Illicit connection rates of SSS were determined. The results indicate that serious illicit connections exist for most SSSs. Annual volume ...

Jan. 29, 2014

By IWA Publishing

Case Study: Precision Machine Shop Eliminates Sewer Discharge

Samsco Water Evaporator enables both cost reduction and elimination of sewer discharge. TEC, Inc. (Rockville, MD), providers of precision sheet metal fabrication and precision machining, for more than thirty years, has partnered with many well-known technology companies to meet their need for superior quality, precision metal products. Their offerings range from simple metal components to ...

Feb. 16, 2007

By Samsco Corporation

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