Demonstration and evaluation of an innovative water main rehabilitation technology: Cured-in-Place Pipe (CIPP) lining

2012 ◽  
Vol 7 (2) ◽  
Author(s):  
John C. Matthews ◽  
Ariamalar Selvakumar ◽  
Wendy Condit
Keyword(s):  
Environmental Protection Agency ◽  
Distribution Systems ◽  
Water Distribution ◽  
New Technologies ◽  
Innovative Technology ◽  
Demonstration Program ◽  
Rehabilitation Technology ◽  
Water Mains ◽  
Water Main ◽  
Willingness To Use

As many water utilities are seeking new and innovative rehabilitation technologies to extend the life of their water distribution systems, information on the capabilities and applicability of new technologies is not always readily available from an independent source. The U.S. Environmental Protection Agency (EPA) developed an innovative technology demonstration program to meet this need. The purpose of the demonstration program is to evaluate rehabilitation technologies that have the potential to reduce costs and increase the effectiveness of the operation, maintenance, and renewal of aging water distribution and wastewater conveyance systems. This paper provides an impartial assessment of the effectiveness and cost of a cured-in-place pipe (CIPP) lining technology for water main rehabilitation. This project demonstrated an innovative Class IV rehabilitation technology that met the project requirements and as part of the evaluation, multiple utilities expressed their willingness to use the technology in the future. The demonstration provided valuable information on the design, installation, and QA/QC of CIPP used to rehabilitate water mains, and makes recommendations for continued improvements in the process used for internal reinstatement of services. One issue that requires more study is the effect of pre-rehabilitation cleaning process on the service connection reinstatement process. Other issues contributing to the need for external reinstatement that should be studied and improved upon include: flush service connections that cannot be identified in smaller diameter pipes and difficulty drilling service connections located in folds.

Demonstration and evaluation of an innovative water main rehabilitation technology: spray-on polymeric lining

2012 ◽  
Vol 7 (1) ◽  
Author(s):  
John C. Matthews ◽  
Ariamalar Selvakumar ◽  
Wendy Condit ◽  
Raymond L. Sterling
Keyword(s):  
Environmental Protection Agency ◽  
Distribution Systems ◽  
Water Distribution ◽  
New Technologies ◽  
Surface Preparation ◽  
Innovative Technology ◽  
Ambient Conditions ◽  
Demonstration Program ◽  
Water Main ◽  
Lining Technology

Many utilities are seeking innovative rehabilitation technologies to extend the life and fix larger portions of their water distribution systems with current funding levels. The information on the capabilities and applicability of new technologies is not always readily available or easy to obtain from an independent source. To meet these needs, the U.S. Environmental Protection Agency (EPA) developed an innovative technology demonstration program to evaluate rehabilitation technologies that have the potential to reduce costs and increase the effectiveness of the operation, maintenance, and renewal of aging water distribution and wastewater conveyance systems. This paper provides an impartial assessment of the effectiveness and cost of a spray-on polymeric lining technology for water main rehabilitation. The spray-on lining technology ultimately resulted in a liner failure, which was discovered during the post-rehabilitation flow test, which was part of the demonstration protocol QA/QC activities. The failure discovery was important in helping to identify material formulation issues and subsequent analysis of the potential causes of the failure indicated that moisture conditions (previously not experienced in product development and use) prevented a proper chemical reaction from occurring, which greatly reduced the material properties, resulting in a lining collapse. Recommendations for the study of important issues such as the effect of ambient conditions on the resin curing process, cleaning requirements for surface preparation, and other key issues in order to help to better understand the technology are made to help avoid the occurrence of future failures with this technology.

scholarly journals Evaluation of Residual Disinfectant Levels in Public Drinking Water Distribution Systems in Relation to an Acanthamoeba Keratitis Outbreak - Illinois, 2002-2009

2021 ◽  
Author(s):  
Hannah Holsinger ◽  
Anna Blackstock ◽  
Sharon L. Roy ◽  
Susan Shaw
Keyword(s):  
Drinking Water ◽  
Environmental Protection Agency ◽  
Multiple Testing ◽  
Distribution Systems ◽  
Water Distribution ◽  
Water System ◽  
Acanthamoeba Keratitis ◽  
Cook County ◽  
Entire Study ◽  
Corneal Injury

Acanthamoeba keratitis (AK) is a painful, potentially blinding eye disease associated with contact lens use and corneal injury. AK, caused by the free-living amoeba Acanthamoeba, is ubiquitous in the environment and has been isolated from municipal water supplies. It can be tolerant of normal chlorine levels in drinking water. An AK outbreak investigated in 2003-2005 in five Illinois counties showed a lower AK age-standardized rate ratio in Cook County than in surrounding counties and was hypothesized to be due in part to reductions in residual disinfectant levels (RDLs) in drinking water. We evaluated RDLs in public water systems in the same five Illinois counties over eight years (2002-2009) using a multivariable model of water system RDL measurements. Fitted RDLs for each county were in the acceptable range by United States Environmental Protection Agency standards for the entire study period. After correcting for multiple testing, two of the surrounding counties had fitted RDLs that differed from Cook County for one year. This pattern differed from the epidemiologic pattern of cases observed in the AK outbreak. Our findings do not support the hypothesis that the development of AK was associated with changes in RDLs in the five Illinois counties.

Dynamic virtual infrastructure benchmarking: DynaVIBe

2010 ◽  
Vol 10 (4) ◽  
pp. 600-609 ◽  
Author(s):  
R. Sitzenfrei ◽  
S. Fach ◽  
M. Kleidorfer ◽  
C. Urich ◽  
W. Rauch
Keyword(s):  
Case Studies ◽  
Distribution Systems ◽  
Water Distribution ◽  
New Technologies ◽  
Study Data ◽  
Data Availability ◽  
Urban Structure ◽  
Real World Data ◽  
Virtual Infrastructure

In environmental engineering, identification of problems and their solutions as well as the identification of the relevant processes involved is often done by means of case study analyses. By researching the operation of urban drainage and water distribution systems, this methodology is suited to evaluate new technologies, strategies or measures with regard to their impact on the overall processes. However, data availability is often limited and data collection and the development of new models are both costly and time consuming. Hence, new technologies, strategies or measures can only be tested on a limited number of case studies. In several environmental disciplines a few virtual case studies have been manually developed to provide data for research tasks and these are repeatedly used in different research projects. Efforts have also been invested in tackling limited data availability with the algorithmic generation of virtual case studies having constant or varying boundary conditions. The data provided by such tools is nevertheless only available for a certain instance in time. With DynaVIBe (Dynamic Virtual Infrastructure Benchmarking), numerous virtual case studies are algorithmically generated with a temporal development of the urban structure (population and land use model) and infrastructure. This provides a methodology that allows for the analysis of future scenarios on a spatio-temporal city scale. By linking a population model with DynaVIBe's infrastructure models, socio-economics impacts on infrastructure and system coherences can be investigated. The problematic of limited case study data is solved by the algorithmic generation of an unlimited number of virtual case studies, which are dynamic over time. Additionally, this methodology can also be applied on real world data for probabilistic future scenario analysis.

The role of biofilms in the mobilisation of polycyclic aromatic hydrocarbons (PAHs) from the coal-tar lining of water pipes

2000 ◽  
Vol 41 (4-5) ◽  
pp. 279-285 ◽  
Author(s):  
M. Maier ◽  
D. Maier ◽  
B.J. Lloyd
Keyword(s):  
Drinking Water ◽  
Distribution Systems ◽  
Water Distribution ◽  
Coal Tar ◽  
Drinking Water Distribution Systems ◽  
Water Pipes ◽  
Real Distribution ◽  
Water Mains ◽  
Drinking Water Distribution ◽  
Polycyclic Aromatic

The influence of biofilm formation on the coal-tar lining of water pipes in drinking water distribution systems was investigated in batch experiments as well as in a continuously flown circular reactor system. The nutrient source for the growth of the biofilm was only the drinking water and the coal-tar coating on the slides. The growth and existence of the biofilm was examined using different techniques. Leaching experiments showed clearly that the biofilm has protective characteristics because enhanced PAH concentrations could be detected after the removal of the biofilm from the slides. Moreover, the dosage of chlorine as a disinfectant during the reactor experiments gave indication that the chlorination resulted in a destabilisation of the biofilm which lead to elevated PAH concentrations. The results are in correspondence with observations made in real distribution systems where enhanced PAH concentrations were observed during disinfection processes. The examination of coal-tar coated water mains revealed that in addition to the protective effect of a biofilm a vast amount of the PAHs was adsorbed on particles embedded in the biofilm, e.g. from the iron oxidising bacteria Gallionella.

scholarly journals Current water main rehabilitation practice using trenchless technology

2021 ◽  
Author(s):  
Yichen Wu ◽  
Chao Kang ◽  
Mohammad Molavi Nojumi ◽  
Alireza Bayat ◽  
George Bontus
Keyword(s):  
Trenchless Technology ◽  
Structural Support ◽  
Rehabilitation Technology ◽  
Underground Utilities ◽  
Water Mains ◽  
History Of ◽  
Current Water ◽  
Water Main ◽  
Infrastructure Rehabilitation ◽  
And Control

Abstract The market for water infrastructure rehabilitation is growing rapidly due to the increasing age of underground utilities. Currently, two common water main rehabilitation methods exist: cured-in-place pipe (CIPP) and polymer spray-on coatings. CIPP can provide structural support for both internal and external loads, while spray-on techniques provide chemical resistance as well as adding minor strength to the existing pipe. This paper summarizes water main rehabilitation practice using CIPP and spray-on methods. The history of trenchless rehabilitation technology is discussed, as well as current methodologies and products for water mains. The design, installation, and monitoring of water main rehabilitation products are also summarized, along with the associated risks. Quality assurance and control (QA/QC) methods are included for evaluating existing products and procedures.

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