Download or read book Technology Assessment of Intermittent Sand Filters written by Damann L. Anderson and published by . This book was released on 1985 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EPA Technology Assessment of Intermittent Sand Filters written by and published by . This book was released on 1985 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EPA Technology Assessment of Intermittent Sand Filters written by United States. Environmental Protection Agency and published by . This book was released on 1980 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Emerging Technology Intermittent Sand Filtration written by Environmental Resources Management (Firm) and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wastewater Technology Fact Sheet written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance of Intermittent Sand Filters written by Mohd. Asri Md. Nor and published by . This book was released on 1991 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Intermittent Sand Filtration to Upgrade Existing Wastewater Treatment Facilities written by Gary R. Marshall and published by . This book was released on 1974 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of an Anaerobic Filter Intermittent Sand Filter for Treating School Wastewater written by Peter Chan and published by . This book was released on 1990 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Emerging Technology written by and published by . This book was released on 1984 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance Evaluation of an Anaerobic Filter Intermittent Sand Filter System for Treating Domestic Wastewater written by Spenta F. Irani and published by . This book was released on 1992 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Slow Sand Filtration written by Nigel Jonathon Douglas Graham and published by . This book was released on 1988 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Treatment of Sewage Using Intermittent Sand Filters written by Robert Howell Grady and published by . This book was released on 1941 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling the Performance of the Intermittent Sand Filter written by Peter A. Cowan and published by . This book was released on 1979 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Intermittent Sand Filters written by National Small Flows Clearinghouse and published by . This book was released on 1985* with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Intermittent Slow Sand Filters written by Magdalena Pachocka and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As many as 500,000 people in developing countries rely on an intermittent slow sand filter, called the BioSand filter to provide safe drinking water. However, it has been shown that BioSand filters do not remove all of the pathogens. The mechanisms of water purification in slow sand filtration have not been clearly understood until this day. In order to successfully influence intermittent slow sand filters performance we need to have a full understanding of removal processes that govern their efficiency. In the first part of this study pathogen removal mechanisms in intermittent slow sand filtration were investigated. In the second part of this study the effect on pathogen removal of a zero-valent iron-sand mixed layer, placed at the bottom of an intermittent slow sand filter was investigated. A series of experiments was performed on sand columns ripened with creek water. It was shown that the majority of E.coli was removed during filtration through the schmutzdecke, while the residence time in the biologically active layer did not have a significant effect on its removal. Quite to the contrary, the majority of MS-2 virus was removed with the residence time in the biologically active layer while the filtration through the schmutzdecke did not have significant affect on its removal. Clearly, two different mechanisms govern bacteria and virus removal in intermittent slow sand filtration. The EDX analysis of the schmutzdecke material revealed that it was primarily composed of O, C, Si, Al, Fe, Ca, and Mn. The zeta potential analysis showed that the schmutzdecke was neutral in charge and was composed of positively, neutrally and negatively charged particles. It was determined that a flocculation process was not a likely mechanism of either E.coli or MS-2 removal in intermittent slow sand filtration. The disturbance of the schmutzdecke had a significant impact on E.coli removal but only a slight effect on MS-2 removal. The intricate internal structure of the schmutzdecke might affect bacteria removal by an increase in rate of collisions. The disturbance of the schmutzdecke may cause the water to bypass the treatment in the schmutzdecke "network" of polymeric strands. It was concluded that an additional treatment step is needed in order to efficiently remove viruses; that the residence time in the schmutzdecke affects the quality of the effluent.; that the disturbance of the schmutzdecke might lead to a significant compromise in water quality and thus should be avoided; and that the addition of Al or Fe into the filter influent might benefit the pathogen removal efficiency. In the second part of the study an intermittent slow sand filter was amended with a zero-valent iron-sand mixture at the bottom of the column in order to improve its performance, especially virus removal. In the first challenge experiment the ZVI amended filter removed 100% of both E.coli and MS-2. Although, in the second challenge experiment the zero-valent iron-sand layer caused a decrease in E.coli/MS-2 concentration for unknown reasons, both E.coli and MS-2, exhibited breakthrough in the effluent. The ZVI powder can be obtained by sieving iron filings which are a waste byproduct of iron industry. Therefore, it is readily available to communities in developing countries. It was shown that use of ZVI in an intermittent slow sand filter can greatly improve its safety. However, the mechanisms responsible for this benefit and limitations of ZVI are not yet explained and deserve to be investigated.
Download or read book An Investigation and Study of the Operation of Certain Intermittent Sand Filters for Sewage Disposal in Massachusetts with Special Reference to Framingham and Natick written by Edward Francis Twomey and published by . This book was released on 1917 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Set up and Operation of a Pilot Scale Intermittent Sand Filter septic Tank System to Evaluate the Effects of Sand Depth and Infiltration Rate on Filter Treatment Efficiency written by James Albert Peeples and published by . This book was released on 1991 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
