combined sewer overflow Articles
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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 ...
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Effects of integrated stormwater management strategies on the combined sewer system and the wastewater treatment plant-river system
ABSTRACTThis is an investigation into possible changes to quantity and composition of sewage in the combined sewer system and the waste water treatment plant (WWTP) caused by new stormwater management strategies (mainly by disconnecting areas from the sewer system). Various scenarios were developed and the consequences on the water systems were calculated by using the simulation model KOSMO, in a ...
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Sanitation
Wastewater collection The standard sanitation technology in urban areas is the collection of wastewater in sewers, its treatment in wastewater treatment plants for reuse or disposal in rivers, lakes or the sea. Sewers are either combined with storm drains or separated from them as sanitary sewers. Combined sewers are usually found in the central, older parts or urban areas. Heavy rainfall and ...
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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 ...
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Merrimack Water Quality Study using UVF to Detect Hydrocarbons and Natural Organics in Merrimack River, Massachusetts - Case Study
Project Description: This study was performed to help support a customer in Washington State looking to distinguish if surface water contains oil sheens or bio sheens using their UVF-Trilogy analyzer. Bio sheens can look like oil sheens but are naturally occurring and are not caused by petroleum spills. Water high in organic content from algae, decayed plant matter or from bacteria in stormwater ...
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Groundwater infiltration, surface water inflow and sewerage exfiltration considering hydrodynamic conditions in sewer systems
Sewer systems are closely interlinked with groundwater and surface water. Due to leaks and regular openings in the sewer system (e.g. combined sewer overflow structures with sometimes reverse pressure conditions), groundwater infiltration and surface water inflow as well as exfiltration of sewage take place and cannot be avoided. In the paper a new hydrodynamic sewer network modelling approach ...
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Modelling sewer sediment deposition, erosion, and transport processes to predict acute influent and reduce combined sewer overflows and CO2 emissions
Understanding of solids deposition, erosion, and transport processes in sewer systems has improved considerably in the past decade. This has provided guidance for controlling sewer solids and associated acute pollutants to protect the environment and improve the operation of wastewater systems. Although measures to decrease combined sewer overflow (CSO) events have reduced the amount of ...
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Extended CSO control storage: what could possibly go wrong?
The Thames Tideway Tunnel (TTT), is one of the main components of the London Tideway Improvements Programme, designed to capture combined sewer overflows (CSOs) which currently discharge untreated combined sewage into the tidal river Thames. CSO discharges would be stored in the tunnel until there is capacity at Beckton sewage treatment works (STW), to accept, for treatment, pumped sewage ...
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Monitoring micropollutants in the Swist river basin
Micropollutant pathways were studied for the Swist river basin (Western Germany). The aim was to verify the effectiveness of a monitoring approach to detect micropollutants entering the river. In a separate sewer system, water was frequently found to be contaminated with micropollutants. Improper connections of sewage canals to the stormwater network seemed to be the cause of pollution. ...
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How Much Could You Save by Avoiding a Consent Decree?
In 2012, St. Louis, MO (Metropolitan St. Louis Sewer District) set a record for the most expensive sewer consent decree in history at $4.7 BILLION to be spent over the next 23 years. The cause of this consent decree and the cause of most consent decrees are overflow events that allow untreated waste into the nearby lakes, streams, river, or other nature areas. There are typically two types of ...
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Combining multimedia models with integrated urban water system models for micropollutants
Integrated urban water system (IUWS) modeling aims at assessing the quality of the surface water receiving the urban emissions through sewage treatment plants, combined sewer overflows (CSOs) and stormwater drainage systems. However, some micropollutants tend to appear in more than one environmental medium (air, water, sediment, soil, groundwater, etc.). In this work, a multimedia fate and ...
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The Metropolitan Sewer District of Greater Cincinnati - OHIO, USA - Case Study
In order to maximize their existing capital assets, reducing overflows and optimizing overall operation efficiency, the Metropolitan Sewer District of Greater Cincinnati (MSD) engaged Xylem in utilizing BLU-X, a drainage network optimization solution that uses a real-time decision support system consisting of smart sensors and actuators that track conveyance capacity. Cincinnati’s ...
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Unlimited Fines for Illegal Sewage Discharges?
The government has announced that it is keen to lift the £250,000 cap for penalties relating to illegal sewage discharges into rivers and the sea carried out by water companies, part of plans to “make polluters pay” that will include all sources of pollution, everything from sewage to plastics and chemicals. Water suppliers are permitted to discharge untreated sewage into ...
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City of Grand Rapids – Michigan, Usa - Case Study
In order to get a better understanding of the infiltration and inflow into their newly separated sanitary sewers, Grand Rapids engaged Xylem in utilizing BLU-X, a real-time decision support system consisting of smart sensors and actuators that track conveyance capacity. Grand Rapids, MI is a community that has garnered accolades in the clean water industry for taking significant ...
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What too much water can do to your collection systems
In areas with a high water table, or for cities more prone to flooding, your underground infrastructure can become inundated with groundwater and stormwater. And despite stormwater systems being built for this type of collection, there are a number of things that can go wrong for both types of collection systems underground—and above ground—that can lead to contamination or degraded ...
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Subsurface Drip Dispersal Of Effluent On Steep Slopes
The treatment and disposal of sewage has evolved considerably since the early 1900’s. As populations grew the methods of disposing treated sewage were frequently redesigned. Engineers had to evaluate and adjust to local conditions, climate, rolling steep terrain and the availability of funds. Municipalities built in the earlier part of the 20th century were designed according to a ...
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Real-time CSO Detection - Case Study
StormSensor is working with the Jersey City Municipal Utility Authority, the Jersey City Office of Sustainability, and the Jersey City Office of Innovation to complete a multi-phase pilot study. The first phase of the study is to identify combined sewage overflow (CSO) events in real time and determine volume of each event to prioritize capital expenditures and enhance regulatory ...
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Cities are finally treating water as a resource, not a nuisance
From Houston to Melbourne, the surprising ways urban areas are dealing with water woes Memorial Day barbecues and parades were thwarted this year in Houston when a massive storm dumped more than 10 inches of rain in two days, creating a Waterworld of flooded freeways, cars, houses and businesses, leaving several people dead and hundreds in need of rescue. But it was a predictable disaster. ...
By Ensia
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ROMAG storm water screen system for the CSO works La Maladière in Neuenburg
With the RSW-K high-capacity storm water screen and a emergency shut-off valve, the volume of the upstream sewerage system is optimally utilized and the receiving body ideally protected against contamination. The storm water screen removes visible solids from the sewage water before the water is discharged into the receiving body. At the La Maladière surplusing works, the ROMAG RSW-K ...
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What You Need to Know About the Environment Act 2021
The Environment Act 2021 has finally been granted royal assent into UK Law. Firstly, this Act establishes the Office for Environmental Protection (OEP) as a new regulatory body for legislative enforcement regarding environmental ...
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