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Evaluation Of The Filtration Effectiveness Of Dewatering Bags And Assessment Of Potential Improvements
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Book Synopsis Evaluation of the Filtration Effectiveness of Dewatering Bags and Assessment of Potential Improvements by : Lewis N. Lloyd
Download or read book Evaluation of the Filtration Effectiveness of Dewatering Bags and Assessment of Potential Improvements written by Lewis N. Lloyd and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geotextile dewatering bags are used on construction sites to treat sediment-laden construction discharge water pumped from excavations or behind cofferdams. Although these bags have become popular because of their small footprint on the construction site, recent observations have revealed that in some cases, fine sediment can pass through these bags, causing an increase in the turbidity of receiving waters. The Virginia Department of Transportation (VDOT) has approved a number of geotextiles for use as dewatering bags based on the geotextiles' physical characteristics such as permittivity and apparent opening size. Because of the concerns with fine sediment, questions regarding the filtration effectiveness of these dewatering bags have been raised. The purpose of this study was to evaluate the filtration effectiveness of dewatering bags approved for use by VDOT and selected dewatering bags that are not currently approved by VDOT but are claimed to provide a higher level of filtration performance. In addition, a preliminary investigation of methods of improving the filtration effectiveness of dewatering bags including the use of straw bales and anionic polymer flocculants was conducted. The results of the study indicated that the filtration effectiveness of geotextile dewatering bags can be highly variable based on the soil characteristics of the construction site. Specifically, sites with soils categorized as "fine-grained" performed poorly compared to sites with coarser soil gradations. An evaluation of VDOT's specifications and those from other states indicated that VDOT's material specifications are appropriate for maximizing the retention of sediments. However, VDOT's implementation guidance for dewatering bags, provided in Specification EC-8 of VDOT's Road and Bridge Standards, needs to be updated to include the proper methods for sizing, siting, and monitoring dewatering bags. Evaluations of secondary sediment barriers (i.e., straw bales) and flocculants, though limited by the study's testing apparatus, showed promising results when used to improve the retention of fine sediments by dewatering bags as a system. These potential improvements were further supported by the literature. An evaluation of a dewatering bag not approved for use by VDOT constructed from a woven geotextile showed that when treating the same volume of construction discharge water with similar sediment concentrations and characteristics, it was capable of maintaining a higher flow rate for a longer period of use compared to nonwoven geotextile dewatering bags. However, woven geotextile dewatering bags provided a lower degree of sediment retention during the initial stages of use. Last, dewatering bags constructed from nonwoven geotextiles showed a degree of stretching with use. It is hypothesized that this stretching could be used to indicate when a dewatering bag is nearing rupture in the field
Book Synopsis Evaluation of Effectiveness of Filtration by : S.D. Lambert
Download or read book Evaluation of Effectiveness of Filtration written by S.D. Lambert and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Energy Research and Development Administration. Technical Information Center Publisher : ISBN 13 : Total Pages :962 pages Book Rating :4.3/5 (129 download)
Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration. Technical Information Center
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1976 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Chemistry and Industry Review written by and published by . This book was released on 1928 with total page 1516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Journal of the Society of Chemical Industry by : Society of Chemical Industry (Great Britain)
Download or read book Journal of the Society of Chemical Industry written by Society of Chemical Industry (Great Britain) and published by . This book was released on 1928 with total page 1918 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conference Papers Index written by and published by . This book was released on 1982 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monthly. Papers presented at recent meeting held all over the world by scientific, technical, engineering and medical groups. Sources are meeting programs and abstract publications, as well as questionnaires. Arranged under 17 subject sections, 7 of direct interest to the life scientist. Full programs of meetings listed under sections. Entry gives citation number, paper title, name, mailing address, and any ordering number assigned. Quarterly and annual indexes to subjects, authors, and programs (not available in monthly issues).
Book Synopsis Case Studies in Waste Minimization by :
Download or read book Case Studies in Waste Minimization written by and published by . This book was released on 1991 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compilation of 68 case studies reporting how companies reduced their production of pollutants, previously published in the newsletter 'Hazardous and Solid Waste Management and Recycling Report', or in EPA guides. Includes reports on DuPont, Hewlett Packard, Newark Air Force Base, and Kodak.
Download or read book The Engineering Index Annual written by and published by . This book was released on 1993 with total page 2264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1981 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Abstract Bulletin of the Institute of Paper Chemistry by :
Download or read book Abstract Bulletin of the Institute of Paper Chemistry written by and published by . This book was released on 1986-06 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Onsite Wastewater Treatment Systems Manual by :
Download or read book Onsite Wastewater Treatment Systems Manual written by and published by . This book was released on 2002 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This manual contains overview information on treatment technologies, installation practices, and past performance."--Introduction.
Download or read book Fossil Energy Update written by and published by . This book was released on 1985 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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