sewer collection Articles

  • Taking Action for The Future

    Sewer networksoperate with practically no installed monitoring of any kind. This simple picture is beginning to change for two main reasons. Firstly, consumers expect ever higher standards from service providers of all kinds, and sewerage undertakers are beging challenged by this. Secondly, environmental legislation is demanding much higher performance from wastewater collection and treatment ...


    By WRc plc

  • A simplified method for estimating chemical oxygen demand (COD) fractions

    A simplified method is presented for estimating chemical oxygen demand (COD) fractions. Its effectiveness was assessed by comparing different values found in literature. This case study considered two main sanitary sewer collection systems in Bogotá, Colombia. The results showed important differences in COD fractions between the sewer collection systems and the reference data. The method ...


    By IWA Publishing

  • Entech Design Inc. – Manufacturer’s comments

    The following section details Entech Design, Inc's Manufacturer Comments pertaining to the test data reported herein. We would like to express our appreciation to the Instrument Testing Association staff for inviting us to participate in this test and complement them on their efforts to arrive at and equitable and reasonable protocol for testing such instrumentation. Additionally, we would like ...


    By Entech Design, Inc.

  • City of Slidell’s drainage and sewer system recovery efforts following Hurricane Katrina

    Hurricane Katrina and its aftermath damaged the drainage and the sewerage collection system in the City of Slidell (City), creating health and safety issues for both the general public and emergency/recovery personnel working in the city. The efforts by the City in restoring these systems were critical to making the city safe and functional for the return of its citizens. This paper will try and ...

  • There’s No Use Crying Over Spilled Sewage: Using Standby Lift Station Pumps to Prevent SSOs before They Happen

    Power outages and unforeseen mechanical failures create the potential for system distress and sanitary sewer overflows (SSOs) in wastewater collection and treatment systems. In accordance with a lawsuit initiated by Mobile Bay Watch (Mobile, Alabama), the Mobile Area Water and Sewer System (MAWSS) chose to install an automatic dry priming backup system to increase system reliability and enable ...

  • Drainage-Area Survey Data Management

    Northumbrian Water Supply of HydroLog4 time-series database and reporting system for drainage area studies Northumbrian Water ordered HydroLog4 as a replacement data management and reporting system for time-series data collected during the short and long-term survey work by internal crews throughout the water company's wastewater management business. ...

  • Modeling the Formation and Fate of Odorous Substances in Collection Systems

    A conceptual model that simulates the formation and fate of odorous substances in branched collection systems is presented. The model predicts the activity of the relevant biomass phenotypes under aerobic, anoxic and anaerobic conditions in force mains and gravity sewers. The formation and fate of individual, malodorous substances in the bulk water, the biofilms and the sediments are modeled. The ...

  • Deep utility survey application

    Introduction Deep utility surveys are in most cases a nightmare to any GPR operator. The fact is that most of the utilities are in urban areas where there is a high amount of EM noise sources. Usually it is a complex net of entangled utilities, buried trenches and shafts that needs to be recorded and interpreted. The deeper one has to go, the harder it is to collect good quality data ...


    By Geoscanners AB

  • Integrating Risk-Based Renewal Into a Capital Improvement Program

     ABSTRACT The Dallas Water Utilities (DWU) is currently completing a master plan for the City’s wastewater collection system (MWH and DWU, Comprehensive Wastewater Collection System Assessment, Collection System Master Plan, Draft June 29, 2007). The master plan is designed to: • Ensure collection system capacity and customer service• Meet need for sustainable renewal of ...

  • Saved Over $1 Million in Unnecessary Expenses

    Santa Barbara, CA - The City of Santa Barbara (CSB) serves nearly 100,000 customers. During the seasonal rains, deteriorating and aging sewer pipes permit unwanted I/I to enter the system raising the risk of sanitary sewer overflows. Santa Barbara recognized that a more comprehensive understanding of their systems performance was necessary to more proactively manage and rehabilitate the City’s ...


    By ADS Environmental Services

  • Addressing SSOs in Austin, Texas: Initial Call to Final Fix

    Austin Water Utility of the City of Austin, Texas faces a challenge of correcting sanitary sewer overflows (SSOs) from its wastewater collection system. Austin is required to address and eliminate the SSOs from the collection system on a short schedule to meet a Federal regulatory mandate. The regulatory mandate requires the Utility to correct overflows and to reduce infiltration and inflow (I/I) ...

  • A dynamic ventilation model for gravity sewer networks

    To implement any effective odour and corrosion control technology in the sewer network, it is imperative that the airflow through gravity sewer airspaces be quantified. This paper presents a full dynamic airflow model for gravity sewer systems. The model, which is developed using the finite element method, is a compressible air transport model. The model has been applied to the North Head ...


    By IWA Publishing

  • Texans do it in a big way: enhanced maintenance of collection system in Austin, Texas

    For a number of years, Austin Water Utility of the City of Austin, Texas has faced a challenge of improving and implementing its collection system maintenance program. Austin is required to address and eliminate the sanitary sewer overflows (SSOs) from its collection system on a short schedule to meet a regulatory mandate. The regulatory mandate requires the Utility to correct overflows and ...

  • Frances Kelsey secondary school advanced wastewater treatment constructed wetland and effluent irrigation

    Location: Mill Bay, B.C. Owner: School District No. 65 Description: Site constraints necessitated a 75.6 m3/d treatment and disposal system to serve 1,200 students. The system includes septic tank, equalization tanks, advanced activated sludge treatment plant with nitrogen and phosphorous removal, constructed wetland, storage tank, ...


    By NovaTec Consultants Inc.

  • Different erosion characteristics of sediment deposits in combined and storm sewers

    To investigate the different erosion patterns of sediments in combined and storm sewers, sediments from three separate sewer systems and two combined sewer systems in urban Shanghai were collected for the flushing experiments. These experiments were conducted with different consolidation periods and shear velocities. As the consolidation period increases, dissolved oxygen exhibits a positive ...


    By IWA Publishing

  • Incorporating Risk into Mechanical Maintenance Decisions

    ABSTRACT County Sanitation District 1 (CSD-1) provides wastewater collection services to about 269,000 connections in the Sacramento, California region. CSD-1 has nearly 2,800 miles of mainlines and collectors and operates 95 sewer pump stations. CSD-1 has implemented a risk based asset management program in both the pipeline and pump stations areas of the collection system. Though the two ...

  • Design-Storm Analysis Extrapolated to Estimate Long-Term Performance

    Design storms provide the discrete conditions needed to begin the design of a collection system. These short-duration events facilitate small and quick model runs, but do not demonstrate the long-term performance of the system. To evaluate long-term performance of systems that were tested and designed with design storms, CH2M HILL, in conjunction with other consultants and the Metropolitan Sewer ...

  • Sanitation

    Wastewater collection The standard sanitation technology in urban areas is the collection of wastewater in sewers, its treatment in wastewater treatment ...


    By IWA Publishing

  • Combined Sanitary Sewer Overflows (SSO) - Performance Focus: Fats, Oil and Grease (FOG) Reductio Case Study

    In-PIpe Technology Company, Inc., drastically accelerates the natural degradation of fats, oil and grease (FOG) in the collection system, thereby removing blockages and occlusions from the pipe and significantly reducing the occurrence of FOG-related sewer overflows, as well as the requisite equipment and manpower required for the physical removal of these blockages. Since In-Pipe started ...

  • Private Lateral Program – Knoxville Utilities Board

    The Knoxville Utilities Board (KUB) entered into a Consent Decree with the United States Environmental Projection Agency (US EPA) in February 2004 to reduce sewer overflows and help improve area waterways. Major Consent Decree goals include reducing the amount of inflow/infiltration (I/I) that enters the collection system. KUB developed the PACE10 Program as a means to implement in an expeditious ...

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