combined sewer overflow engineering Articles

  • 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 ...


    By WesTech Engineering, Inc.

  • 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 ...

  • Water sensitive urban design retrofits in Copenhagen – 40% to the sewer, 60% to the city

    Water Sensitive Urban Design (WSUD) is emerging in Denmark. This interdisciplinary desk study investigated the options for WSUD retrofitting in a 15 km2 combined sewer catchment area in Copenhagen. The study was developed in collaboration with the City of Copenhagen and its water utility, and involved researchers representing hydrogeology, sewer hydraulics, environmental ...


    By IWA Publishing

  • Climate change: More intense rains could swamp Chicago`s aging sewers

    In a city built on a swamp, where rainstorms already flood basements and force sewage into Lake Michigan and local streams, climate change could make Chicago's chronic water pollution woes even worse. Researchers hired by Mayor Richard Daley's office estimate that intense rainfall will happen more frequently in the not-so-distant future because of warming global temperatures, challenging the ...

  • 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 ...


    By EnTech Engineering, Inc

  • Innovative Technology Provides Real Time Flow Data Management in Indianapolis

    This paper presents the program developed by the City of Indianapolis for managing its sewer flow data and describes how it is making real-time information available to several groups that have a stake in the City’s environmental management programs. These groups include United Water, the contract operator for the City’s collection system and its two WWTPs, the Capitol Improvement Program ...

  • Assessing the efficiency of different CSO positions based on network graph characteristics

    The technical design of urban drainage systems comprises two major aspects: first, the spatial layout of the sewer system and second, the pipe-sizing process. Usually, engineers determine the spatial layout of the sewer network manually, taking into account physical features and future planning scenarios. Before the pipe-sizing process starts, it is important to determine locations of possible ...


    By IWA Publishing

  • Atlanta upgrades to InfoWorks CS to aid environmental program

    The City of Atlanta, Georgia, in the USA, has purchased InfoWorks CS to help it meet stringent US Environmental Protection Agency (EPA) and Georgia State Environmental Protection Division (EPD) requirements for discharge of its wastewaters to the Chattahoochee River. The Chattahoochee, one of the smallest rivers in the US supplying a metropolitan area, provides 80% of the city’s water needs. ...


    By Innovyze

  • CSO Treatment Technologies: A Comprehensive Design and Resource Manual

    Increasingly, municipal wastewater authorities are exploring new and innovative treatment technologies specifically designed for Combined Sewer Overflows (CSOs). These technologies, when applied as part of an overall wastewater management strategy, can produce efficient and cost-effective solutions for CSOs. However, like all technologies, theyrequire systematic design and proper operation. In ...


    By XCG Consultants Ltd.

  • 10 Years Experience of CSO Management in the United Kingdom

    ABSTRACTThe United Kingdom’s ageing sewerage infrastructure meant that by the late 20th century the country was facing a major environmental problem associated with storm sewage discharges from more than 8,000 unsatisfactory combined sewer overflows (CSOs). Addressing this problem presented a major challenge to the UK water industry, but it is a challenge that has been met by a combination of ...

  • MLE Process Plus Flow Bending for CSO Flows

    ABSTRACTCombined sewer overflows (CSOs) are gaining the attention of environmentalists and regulators. Communities are taking steps to decrease the number of overflow events and to reduce the amount of pollutants discharged in these events. Like most communities in the Northwest, Mount Vernon, Washington, has a mandate to reduce CSOs to less than one event per year. Engineers, regulators, and ...

  • Retention Treatment Basin Operation, Maintenance and Budgeting Requirements

     ABSTRACT This paper will provide information to planners, engineers, and owners about operation and maintenance issues and costs associated with Retention Treatment Basin facilities. KEYWORDS Combined sewer overflow, retention treatment basin, operations, maintenance, budgeting. INTRODUCTION ...

  • Urban drainage system planning and design – challenges with climate change and urbanization: a review

    Urban drainage systems are in general failing in their functions mainly due to non-stationary climate and rapid urbanization. As these systems are becoming less efficient, issues such as sewer overflows and increase in urban flooding leading to surge in pollutant loads to receiving water bodies are becoming pervasive rapidly. A comprehensive investigation is required to understand these factors ...


    By IWA Publishing

  • Necessary driving forces for infrastructure sustainability

    The forces and complex interactions that hinder and promote the application of sustainable infrastructures are discussed along with changes that are needed in our economic-mindset for evaluating project costs. Some existing sustainable projects result from favourable economics. However, many fall in the trash basket as a result of so-called unfavourable economics. One of the key driving forces ...


    By Inderscience Publishers

  • Green infrastructure approaches for CSO Controlin urban areas

    ABSTRACT A nationwide investigation of green infrastructure was conducted for several major metropolitan areas, including Chicago, Milwaukee, New York City, Philadelphia, Pittsburgh, Portland (OR), Seattle and Washington D.C. This report highlights some of the cities’ urban green infrastructure projects and the projects’ relationship with combined sewer overflow (CSO) control plans and ...

  • The Challenge of the Future: Operating Emerging Disinfection Technologies

    ABSTRACTThe Clean Water Act (1972 and 1977) established the basis for regulating pollutant discharges into the waters of the United States. This Act contains many provisions regulating pollutant discharges and surface water quality in the United States. This act has also been modified by numerous revisions and amendments since it was enacted in 1972. The National Pollutant Discharge Elimination ...

  • Side By Side By Side: The Evaluation of Three High Rate Process Technologies for Wet Weather Treatment

    ABSTRACTMost large combined sewer communities face significant financial investment to address wet weather compliance issues. Innovative, cost-effective methods of dealing with wet weather flows is a must to prevent spiraling rate increases for rate payers. High rate clarification and high rate filtration systems are becoming the technology of choice for treating wet weather flows. The City of ...

  • Quantitative pipe condition assessment with Pipe Penetrating Radar

    Abstract Pipe Penetrating Radar (PPR) is the underground in-pipe application of GPR, a non-destructive testing method that can detect defects and cavities within and outside mainline diameter (>18 in / 450mm) non-ferrous (reinforced concrete, vitrified clay, PVC, HDPE, etc.) pipes. The key advantage of PPR is the unique ability to map pipe wall thickness and deterioration including voids ...


    By SewerVUE

  • Water System Infrastructure – A View of Where We Are, Where We Could Go and How We Can Get There.

    This is the first of several essays that are aimed at focusing attention on water and sewer infrastructure systems. In this essay, the current state of city and regional systems are examined, the current state of the industry will be examined next, investigating some of the tools, resources and technologies that are available, today. Beyond that, the final essay in this series will look at the ...


    By H2bid, Inc.

  • New Energy BFP case study

    Clarification and Dewatering Control Industrial TSS The New Energy Corporation facility in South Bend IN produces 380,000 M3 per year (100 million gallons per year) of ethanol from corn feedstock. It also produces about 272,000 tonnes per year (300,000 tons per year) of carbon dioxide and 299,000 tonnes per year (330,000 tons per year) of distillers' dried grains with solubles (DDGS) ...


    By Komline-Sanderson

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