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The application of Appropriate Technology

Articles for Keyword "roughing filters"

Horizontal Flow Roughing Filter

Posted on Oct 26, 2011

Manual detailing how to estimate and design horizontal flow roughing filters. Among pre-treatment methods used before slow sandfilters (SSF), horizontal-flow roughing filters( HRF) have been found to be the most effective and appropriate for application in developing countries. This is because they are simple, require no mechanical parts, have low capital cost, can be operated for a long time due to their high solids retention capacity, and with a wide variety of raw surface water characteristic. Most research on HRFs has concentrated on turbidity (solids) removal whereas the way to estimate and design the run duration time before filter cleaning is necessary has received little attention. In this research, a large gravel (size l0-20 mm) filter media were placed as a single package, uncovered and outlet at the top. You can read the whole of this paper as  a PDF document (640...

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Managing Water In The Home: Accelerating Health Gains From Improved Water Supply

Posted on Oct 26, 2011

A WHO document from 2002 examining small scale water purification methods. A large fraction of the World’s population around 1.1 billion people – does not have access to improved sources of water. For many others, contamination of water during transport and in the household presents a significant health risk. For this segment of the world’s population, use of effective technologies for household water treatment and storage is likely to have direct beneficial effects in the form of reduced infectious diseases and also contribute to greater productivity and other associated benefits from improved health. Household treatment often can provide these benefits to underserved populations much more quickly than it will take to design, install and deliver piped community water supplies. Identifying the most accessible and effective methods for household water storage and treatment are matters of considerable importance and are the subject of this report. You can read the whole document as a PDF file (244...

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Surface Water Treatment By Roughing Filters

Posted on Oct 26, 2011

Excellent manual on roughing filters by SANDEC, detailing water treatment alternatives applicable to rural water supplies and processes for solid matter separation. For further SANDEC publications, go here:http://www.eawag.ch. You can read the whole document as a PDF file (12.4...

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