Storm Water Filtration Due to its high surface area, neutral pH and irregular, porous surface texture, expanded perlite is ideally suited for a variety of applica- tions in storm water filtra- tion; most notably as a component in media filter drain mixes, and another as an element of catch basin filter media. Roadside Media Filter Drains—Developed by Washington State Dept. of Transportation (WSDOT), media filter drains incorporate horti- cultural grade perlite, dolomite, and agricultural gypsum held in place by crushed rock, and are placed e physical character of expanded perlite lends itself to a variety of special purposes—including various applications in the broad category of water quality management. For a detailed explanation of perlite expansion see info-sheet: Why Perlite Works. Perlite for Water Quality Management Top: A roadside Media Filter Drain containing perlite and other aggregates for filtering storm water contaminants. Above: Cross section of a typical roadside Media Filter Drain project, based on a design contained in the 2014 Washington State Dept of Ecology Stormwater Management Manual. Leſt: A cross-section of a storm drain showing roadway runoff being purified before discharge by a filter canister containing perlite. Media Filter Drain Mix Containing Perlite 50-Year Water Surface Elevation Grass Strip Non-Vegetation Zone Edge of Paved Shoulder Soil Mix Geotextile Cover Gravel Backfill Underground Drainage ROADSIDE MEDIA FILTER DRAIN along roadways to filter suspended solids and other pollutants from roadway runoff. Catch Basin Filters—Various filtration media—including expanded perlite—are used to remove contaminants from storm water runoff passing through catch basins before being released to local sewer systems and waterways. Debris Basket (removable) Diversion Lid Street-Level Grate Debris Screen Polluted Stormwater Paved Surface Overflow Tube Discharge Pipe Clean Filtered Water Catch Basin Filter Canister Containing Perlite CATCH BASIN FILTER
Transcript
Storm Water Filtration Due to its high surface area, neutral pH and irregular, porous surface texture, expanded perlite is ideally suited for a variety of applica-tions in storm water �ltra-tion; most notably as a component in media �lter drain mixes, and another as an element of catch basin �lter media.
Roadside Media Filter Drains—Developed by Washington State Dept. of Transportation (WSDOT), media �lter drains incorporate horti-cultural grade perlite, dolomite, and agricultural gypsum held in place by crushed rock, and are placed
�e physical character of expanded perlite lends itself to a variety of special purposes—including various applications in the broad category of water quality management. For a detailed explanation of perlite expansion see info-sheet: Why Perlite Works.
Perlite for Water Quality Management
Top: A roadside Media Filter Drain containing perlite and other aggregates for �ltering storm water contaminants.
Above: Cross section of a typical roadside Media Filter Drain project, based on a design contained in the 2014 Washington State Dept of Ecology Stormwater Management Manual.Le�: A cross-section of a storm drain showing roadway runo� being puri�ed before discharge by a �lter canister containing perlite.
Rainwater Surge Reduction & Green RoofsHorticultural perlite is used as a light weight constitu-ent of soil mixes that make up vegetated roofs. Among the bene�ts of these roof-top gardens, is the ability to temporarily hold and slow the surge of rainwater encountered during heavy or prolonged rain events. Many municipalities o�er credits or other incentives to developers when eco-roofs are incorporated into new building designs. Also see info-sheets: Gardens in the Sky and Gently on the Roof.
Soil Stabilization and Liquid Waste Solidi�cationTests have shown that the porous structure of �ne grades of expanded perlite allows it to absorb up to 8 times its weight in water. �is ability underlies its use to stabilize highly saturated soils, water from well drilling services, and other hazardous, liquid wastes. Also see info-sheet: Perlite as a Sludge Absorbent.
FiltrationPerlite's role in �ltration of liquids is well documented (and described in detail elsewhere on perlite.org). It plays an important role in municipal and industrial water treatment systems where it is used in conjunc-tion with a rotary vacuum drum �lter to remove solids and other contaminants from polluted waste water.
Media Filter Drain MixContaining Perlite50-Year Water Surface Elevation
Grass StripNon-Vegetation Zone
Edge of Paved Shoulder
Soil Mix
Geotextile Cover
Gravel Backfill
Underground Drainage
ROADSIDE MEDIA FILTER DRAIN
along roadways to �lter suspended solids and other pollutants from roadway runo�.
Catch Basin Filters—Various �ltration media—including expanded perlite—are used to remove contaminants from storm water runo� passing through catch basins before being released to local sewer systems and waterways.
Debris Basket(removable)
Diversion Lid
Street-Level Grate
Debris Screen
Polluted Stormwater
Paved Surface
Overflow Tube
Discharge PipeClean Filtered Water
Catch Basin
Filter CanisterContaining Perlite
CATCH BASIN FILTER
Storm Water Filtration Due to its high surface area, neutral pH and irregular, porous surface texture, expanded perlite is ideally suited for a variety of applica-tions in storm water �ltra-tion; most notably as a component in media �lter drain mixes, and another as an element of catch basin �lter media.
Roadside Media Filter Drains—Developed by Washington State Dept. of Transportation (WSDOT), media �lter drains incorporate horti-cultural grade perlite, dolomite, and agricultural gypsum held in place by crushed rock, and are placed
�e physical character of expanded perlite lends itself to a variety of special purposes—including various applications in the broad category of water quality management. For a detailed explanation of perlite expansion see info-sheet: Why Perlite Works.
Perlite for Water Quality Management
Perlite Institute, Inc.www.perlite.org • (717) 238-9723
Rainwater Surge Reduction & Green RoofsHorticultural perlite is used as a light weight constitu-ent of soil mixes that make up vegetated roofs. Among the bene�ts of these roof-top gardens, is the ability to temporarily hold and slow the surge of rainwater encountered during heavy or prolonged rain events. Many municipalities o�er credits or other incentives to developers when eco-roofs are incorporated into new building designs. Also see info-sheets: Gardens in the Sky and Gently on the Roof.
Roof-top gardens designed with lightweight perlite growing media, reduce the rate of discharge to catch basins and sewers, improving turbidity levels overall in local streams and rivers.
Le�: Industrial laundry services use a rotary vacuum drum �lter coated with perlite �lter aid to strain and recycle waste water.
Soil Stabilization and Liquid Waste Solidi�cationTests have shown that the porous structure of �ne grades of expanded perlite allows it to absorb up to 8 times its weight in water. �is ability underlies its use to stabilize highly saturated soils, water from well drilling services, and other hazardous, liquid wastes. Also see info-sheet: Perlite as a Sludge Absorbent.
FiltrationPerlite's role in �ltration of liquids is well documented (and described in detail elsewhere on perlite.org). It plays an important role in municipal and industrial water treatment systems where it is used in conjunc-tion with a rotary vacuum drum �lter to remove solids and other contaminants from polluted waste water.
photo courtesy of Supreme Perlite Co.
along roadways to �lter suspended solids and other pollutants from roadway runo�.
Catch Basin Filters—Various �ltration media—including expanded perlite—are used to remove contaminants from storm water runo� passing through catch basins before being released to local sewer systems and waterways.
