Sanitary Sewer Articles | Environmental XPRT

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)

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

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)

Latah creek sanitary sewer main repair, Spokane, Washington - Case Study

A SEEMINGLY simple kid’s prank of throwing rocks and other material down a storm drain resulted in a major emergency repair job to prevent the collapse of a 42-in. sanitary sewer main in Spokane, Washington. In a short period of time, a group of kids completely blocked an 18-in. pipe leading to the city’s combined sanitary/ storm drain system. The drain soon began to overflow, sending ...

Jun. 9, 2009

By Presto Geosystems

Lessons Learned from Large Diameter Sanitary Sewer Pipe Bursting Project: Conversion of Abandoned Gravity Sewer Main Into Upsized Sanitary Force Main South San Francisco, CA

ABSTRACTAs an increasing number of large diameter pipe bursting jobs are attempted, more is being learned about the capabilities and potential of pneumatic pipe bursting. The large diameter pipe bursting project in South San Francisco is one of the most challenging and innovative bursting projects ever attempted in North America. It is being heralded as a landmark pipe bursting job. ...

Oct. 22, 2006

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)

CMOM in california – the race to implement waste discharge requirements for sanitary sewer collection systems

On May 2, 2006, the California State Water Resources Control Board adopted Order Number 2006-0003, the statewide General Waste Discharge Requirements (WDRs). The WDRs establish minimum operation, maintenance and management standards to significantly reduce sanitary sewer overflows (SSOs) from publicly owned collection systems greater than one mile in length. The agencies that own or operate ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Performance of sanitary sewer collection system odour control devices operating in diverse conditions

Controlling odours from sanitary sewer systems is challenging as a result of the expansive nature of these systems. Addition of oxidizing chemicals is often practiced as a mitigation strategy. One alternative is to remove odorous compounds in the gases vented from manholes using adsorptive media. In this study, odour control devices located at manholes were observed to determine the ability of ...

Dec. 19, 2013

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 ...

Mar. 2, 2016

By In-Pipe Technology Company, Inc.

Process to Estimate Sanitary Sewer Pipe Remaining Life Provides MWWSSB Remedial Decision Information

ABSTRACTA condition assessment study for the Water Works and Sanitary Sewer Board of the City of Montgomery’s (MWWSSB’s) West Catoma Interceptor (WCI) was conducted in 1998 and 2003. The WCI was evaluated in 1998 using core sampling, closed-circuit television, and manhole (MH) inspections. Approximately 193 MHs and 65,000 linear feet (LF) of pipe were inspected. A subsequent study conducted in ...

Oct. 22, 2006

By Water Environment Federation (WEF)

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 ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Economic analyses for optimizing the construction of separate sewer in a hybrid sewer system

Metropolitan Taipei located in north Taiwan uses a hybrid sewer system consisting of mostly separate sewer for the populated regions, and partly combined sewer for less populated regions. This study used the concept that Marginal Cost of Control (MCC) equals to Marginal Benefits of Control (MBC) to establish the method for studying the optimal household connection percentage, and the most ...

Dec. 1, 2010

By IWA Publishing

Rehabilitation of a Large Semi-Elliptical Sewer

ABSTRACTThe Sanitation Districts of Los Angeles County (Districts) own, operate, and maintain a wastewater treatment and collection system that includes approximately 1300 miles of sanitary sewers ranging from 6 to 144 inches in diameter. A portion of the Districts’ Joint Outfall “A” Trunk Sewer was constructed of cast-in-place reinforced concrete having a semi-elliptical cross section and ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Multifaceted sewer improvements program eliminates sewer connection moratorium and system overflows

The sewer system serving Borough of Jewett City, Connecticut dates from the late 1800’s and was originally constructed as a combined sewer system with the discharges directed to the area rivers. In the 1970’s, the raw sewage discharges from the Borough system were removed from the rivers and redirected to a newly constructed wastewater treatment facility. However, the overflows from the ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Low pressure sewer system for affluent existing neighborhood

The River Oaks subdivision is an affluent, mature residential community located in Fairfax, County Virginia which includes 114 existing single family dwelling units with individual septic tank drainfields. The Fairfax County Health Department determined that several drainfields have failed and expressed concern that others would soon fail. In order to prevent the health and environmental problems ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Integrating Rural Wastewater Management: Crow Wing County Sanitary Management District

ABSTRACTDouble-digit population growths and skyrocketing development has resulted in a dramatic increase in unsewered development in Minnesota’s popular lakes county. To help assure protection of human health and the quality of the waters, a county wide decentralized sanitary district with pilot subordinate districts is being established in Crow Wing County. The objective of the district is to ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Time for a re-examination of sewer design flow criteria

Each year, many miles of new or rehabilitated sewer lines or pumping stations are designed and constructed based on flow criteria that may be unrelated to the desired level of system performance. Because of the need to reduce the risk of sanitary sewer overflows and sewer backups into buildings, it can be beneficial to re-examine the basis of sewer hydraulic design. Traditional approaches such as ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Delivering an Enhanced Sewer Condition Prioritization Process

SCREAM™ is a sewer and manhole condition assessment tool developed by CH2MHill. It has been built into Wallingford Software’s InfoNet asset management solution as one of the standard choices for sewer and manhole condition grading. There is emphasis across the collections systems industry worldwide for sewer condition prioritization methods and manhole condition ranking. Although currently the UK ...

Dec. 20, 2006

By Innovyze

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)

Another Sewer from Hell - The City of Richmond, British Columbia, Canada Experience

ABSTRACTThe City of Richmond has a population of approximately 180,000 and is located on a flood plain at approximately sea level. These physical attributes present numerous challenges with underground utility design, including sanitary sewers. On January 21, 2005 the City declared a local state of emergency near the intersection of No. 3 Road at Cook Road due to the development of a large ...

Oct. 22, 2006

By Water Environment Federation (WEF)

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