sanitary sewer Articles | Environmental XPRT

A New Method of Predicting Rainfall Dependent Inflow and Infiltration

ABSTRACT There are many hydrological models available to quantitatively characterize rainfall dependent inflow and infiltration (RDII) in a sanitary sewer system, most of which were first derived for quantifying rainfall surface runoff process and later found many applications in studying the issues of combined sewer overflows (CSO). However, it has been long recognized that profound ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Salmon Processor

The water is from a salmon processor where they are using an Andritz 3 phase decanter centrifuge to recover the oil in the salmon parts after packaging the salmon for human consumption. The oil is very valuable for use in the health food industry. The Andritz centrifuge recovers 90% of the oil from the wastestream, but leaves a residual oil emulsion that needs to be treated prior to discharge to ...

Jan. 30, 2009

By Integrated Engineers Inc.

Risk Analysis for SSO Projects

ABSTRACT In 1999 the City of Atlanta negotiated a comprehensive settlement titled the First Amended Consent Decree (FACD) with the United States Environmental Protection Agency (EPA) and Georgia Environmental Protection Division (EPD) to address its sanitary sewer system to prevent future Sanitary Sewer Overflows (SSOs). The Clean Water Atlanta Program Management Team (PMT) has developed a ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Savings through shared risk and time & materials contracts

When the City of London set out to rehabilitate two substantial problems in the sanitary sewer system, it quickly became apparent that an uncertain scope of work as well as high risk did not lend well to a standard tendered contract process. As this form of contract would have the contractor take on all the risk, the cost of the works would increase substantially. Instead, the City acted as the ...

Oct. 13, 2007

By Water Environment Federation (WEF)

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

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 ...

Jan. 1, 2016

By IWA Publishing

Tractive force design for self-cleansing of sanitary sewers

The new edition of the WEF FD 5/ASCE MOP 60 manual recommends use of the tractive force approach for self-cleansing design of gravity sanitary sewers. The tractive force approach is a major improvement in designing gravity sewers to achieve self-cleansing. This approach results in a self-cleansing slope value, Smin, for the combination of sewer diameter, design particle size, d, and design ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Refinery Sour Water

The refinery needed to meet the discharge requirements to the local sanitary sewer for the 2,000,000 gallons that was stored. The water is high in sulfides (up to 4,000 ppm) and the limit for discharge was 0.1 ppm. The best and least complicated and costly method uses the Floccin 1105 followed by post ozonation. The results of the finished water are being tested at an EPA certified analytical ...

Jan. 30, 2009

By Integrated Engineers Inc.

Saint Paul Sanitary Sewer Utility’s Path to AAA from BBB ‘Lower Cost Financing Yielding more Money for Projects’

Abstract The ability to fund infrastructure needs and determine user rates is in large part driven by the financing costs. Financing costs can be significantly reduced by achieving higher credit ratings. This session will explore the factors and strategies to obtain higher credit ratings. The session will show techniques to position utility management, financial position and customer base to ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Getting your money’s worth - collecting and utilizing accurate flow monitoring data for collection system analysis and modeling

A comprehensive flow monitoring network can provide powerful insight about the performance of a sanitary sewer collection system. Accurate flow monitoring data reveals numerous system details, such as sewer usage patterns, the presence of sediments, groundwater infiltration, rainfall-dependent inflow and infiltration, stream intrusion, and sewer exfiltration or leakages. Knowledge of these ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Getting your money’s worth - collecting and utilizing accurate flow monitoring data for collection system analysis and modeling

Abstract A comprehensive flow monitoring network can provide powerful insight about the performance of a sanitary sewer collection system. Accurate flow monitoring data reveals numerous system details, such as sewer usage patterns, the presence of sediments, groundwater infiltration, rainfall-dependent inflow and infiltration, stream intrusion, and sewer exfiltration or leakages. Knowledge of ...

Oct. 13, 2007

By Water Environment Federation (WEF)

ACTIFLO® Clarifiers to Treat Sanitary Sewer Overflow in Lawrence, KS WWTP

The ACTIFLO Process was evaluated as an alternative for sanitary sewer overflow (SSO) treatment at the City of Lawrence, Kansas's wastewater treatment plant (WWTP). Prior to implementation of the ACTIFLO Process and expansion of the existing biological treatment trains, the facility struggled with handling wet weather events that exceeded the 9 MGD (average) or 18 mgd (peak) flow ...

Jul. 1, 2007

By Veolia Water Technologies North America

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 ...

Apr. 6, 2012

By IWA Publishing

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 ...

Oct. 13, 2007

By Water Environment Federation (WEF)

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 ...

Oct. 13, 2007

By Water Environment Federation (WEF)

WDRs: Developing an Effective Sanitary Sewer Management Plan Utilizing Innovative GIS Solutions

As California’s wastewater collection system infrastructure begins to age, the need to proactively manage this valuable asset becomes increasingly important. The first step in this process is to have a reliable reporting system for Sanitary Sewer Overflow (SSOs). Although there are some data systems to record spills and various spill-reporting requirements have been developed, inconsistent ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Developing an Effective Sanitary Sewer Management Plan Utilizing Innovative GIS Solutions

As California’s wastewater collection system infrastructure begins to age, the need to proactively manage this valuable asset becomes increasingly important. The first step in this process is to have a reliable reporting system for Sanitary Sewer Overflow (SSOs). Although there are some data systems to record spills and various spill-reporting requirements have been developed, inconsistent ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Sewer rehabilitation for capacity increase fast track solution for providing required capacity

The large North Carolina municipality had an obligation to provide sanitary sewer services to a development located in the downtown area. The existing sewer in the area was not sufficient to meet the demand and the increased capacity needed to be provided within three months. This paper outlines the required sewer assessment procedure and rehabilitation method selection. The ultimate solution ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Lafayette, LA Utilities - Case Study

Challenge Get out in front of numerous accidents waiting to happen in the 696 miles of sanitary sewer in the Lafayette Utilities System (LUS), which serves 105,000. Solution Among other tasks in this large project, we helped LUS avoid a $300,000 rerouting of 1,000 feet of undersized mainline by instead bursting the 8-inch clay pipe and pulling through 10-inch HDPE. The out-of-pocket ...

Nov. 12, 2015

By Tric Tools, Inc.

How to Nearly Double Sewer Rates without Ratepayer Revolt

In early 2005, the City of Indianapolis identified $435 million in stormwater and sanitary infrastructure needs for 2005-2008. In order to finance these projects, the city needed to raise sanitary sewer rates by 87 percent and stormwater rates by 80 percent over a three-year period. The Department of Public Works developed and implemented a public relations campaign to disseminate the messages ...

Oct. 21, 2006

By Water Environment Federation (WEF)

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) ...

Oct. 21, 2006

By Water Environment Federation (WEF)

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