General Application
See also: Reed bedThe three types, using reed beds (constructed wetlands but using principally reed plants), are used. All these systems are used commercially, usually together with septic tanks as primary treatment, Imhoff tanks or screeners in order to separate the solids from the liquid effluent). Some designs however are being used to act as primary treatment as well. An other way is the combination Constructed wetland- Composting toilet.
System types are:
- Surface flow (SF) Constructed Wetland (or reed bed)
- Sub Surface Flow (SSF) Constructed Wetland (or reed bed)
- Vertical Flow (VF) Constructed Wetland (or reed bed)
All three types are placed in a basin with a substrate. For most undertakings the bottom is lined with either a geomembrane (kind of rubber / plastic), concrete or clay (when there is appropriate clay type)in order to protect the water table and surrounding grounds. The substrate can be either gravel - generally limestone or pumice/volcanic rock, depending on local availability or sand or a mixture of various sizes of media (for vertical flow constructed wetlands).
Read more about this topic: Constructed Wetland
Famous quotes containing the words general and/or application:
“At Hayes’ General Store, west of the cemetery, hangs an old army rifle, used by a discouraged Civil War veteran to end his earthly troubles. The grocer took the rifle as payment ‘on account.’”
—Administration for the State of Con, U.S. public relief program (1935-1943)
“Courage is resistance to fear, mastery of fear—not absence of fear. Except a creature be part coward it is not a compliment to say it is brave; it is merely a loose application of the word. Consider the flea!—incomparably the bravest of all the creatures of God, if ignorance of fear were courage.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)