A glossary of common terms: Adsorption: the attachment of soluble material to soil. Biodegradation: the breaking down of organic (carbon-containing) ingredients into carbon dioxide, water and minerals by the action of microorganisms, such as bacteria. Drain field: a series of distribution pipes placed in trenches filled with gravel. Effluent: clarified wastewater. Groundwater: water beneath the ground surface.

Leach field: another name for drain field. Septic tank system: wastewater treatment system, usually small, utilizing a settling tank and a wastewater distribution system. Sludge: heavier solids that collect on the bottom of the septic tank. Tile field: another name for drain field. Wastewater: used household water from kitchens, bathrooms, laundry rooms, etc. continued...

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Illustrations: [The Septic Tank System] [Biodegradation] [Adsorption]