How about Reverse Filters
Reverse or inverted filters allow water to drain freely without carrying away suspended solids. Their pore size must be properly related to the fines being protected. Terzaghi's...
Efficiences of Advanced Waste Treatment Obtained with Upgraded Trickling Filters
Many or most cities and towns, and particularly the smaller ones, still use trickling filters in their wastewater treatment plants. The process is economical and reliable, but unfortunately...
New Use for Filter Fabric: Highway Construction
A growing area of filter fabric use is road construction, both secondary and superhighway. The article focuses on one case history in Cambridge, Maryland where, after a one-year test,...
Bypassing Sand at Coastal Inlets
To reduce dredging requirements and to provide calm navigation channels, the U.S. Corps of Engineers often constructs jetties and breakwaters. These structures block sand drifting along...
Filter Fabrics in Shore-Protection Structures: Save Money, Ease Installation
Over the past decade, plastic filter fabrics have seen growing use in shore-protection structures (e.g. revetments, breakwaters, jetties), river-bank protection schemes, and other areas...
A Look at Newer Methods for Dewatering Wastewater Sludges
The U.S. water cleanup effort is resulting in the production of huge quantities of additional sludge. Because of the difficulty of disposing of this sludge, it is usually dewatered. Although...
Cost-Effectiveness of On-Site and Community Sewerage Alternatives
Some research and development work has taken place, over many years, on individual on-site treatment and disposal systems as well as non-conventional systems. Most recent work, however,...
Plastic Filter Fabrics Have Bright Future
There are thousands of existing installations using filter fabrics in North America and additional thousands in Europe, most built in the past 10 years. The momentum is gathering. Filter...
Inverted Filter Stabilizes Soil, Stops Erosion
The inverted filter concept was invented by Karl Terzaghi to prevent dams from failing by water piping through the foundation. Laboratory and field testing have refined the necessary specifications...
Filter Fabrics: Growing Use in Road and Highway Construction
Filter fabrics are seeing increasing use in road and highway construction; and promise to see greatly expanded use in the near future. A rapidly growing use is in constructing longitudinal...
Filtering Materials for Sewage Treatment Plants
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