oxidation ditch - ορισμός. Τι είναι το oxidation ditch
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Τι (ποιος) είναι oxidation ditch - ορισμός

WASTEWATER TREATMENT PROCESS USING AERATION AND A BIOLOGICAL FLOC
Activated-Sludge Method; Activated Sludge; Activated sludge process; Activated-sludge process; Oxidation ditch
  • Activated sludge addition (seeding) to a pilot scale membrane bioreactor in Germany
  • Surface aerator for aeration tank at activated sludge sewage treatment plant (at Morro Alto Treatment Plant, [[Vespasiano]], Brazil)
  • Fine bubble diffusers in aeration tank of activated sludge sewage treatment plant near Adelaide, Australia
  • Activated sludge tank at Beckton [[sewage treatment plant]], UK. The white bubbles are due to the diffused air aeration system.
  • Davyhulme Sewage Works Laboratory]], where the activated sludge process was developed in the early 20th century
  • Activated sludge under the microscope
  • Aerial photo of Kuryanovo wastewater treatment plant in [[Moscow]], Russia

Activated sludge         
The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa. It uses air (or oxygen) and microorganisms to biologically oxidize organic pollutants, producing a waste sludge (or floc) containing the oxidized material.
activated sludge         
¦ noun aerated sewage containing aerobic microorganisms which help to break it down.
Ditch         
  • Sueca]], [[Valencian Community]]
  • Ditches at the [[Ouse Washes]] [[nature reserve]].
  • Waterplants growing in a ditch in the Netherlands, showing ''[[Sagittaria sagittifolia]]'' to the right.
SMALL TO MODERATE TRENCH CREATED TO CHANNEL WATER
Ditches; Open ditch
A ditch is a small to moderate divot created to channel water. A ditch can be used for drainage, to drain water from low-lying areas, alongside roadways or fields, or to channel water from a more distant source for plant irrigation.

Βικιπαίδεια

Activated sludge

The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa. It uses air (or oxygen) and microorganisms to biologically oxidize organic pollutants, producing a waste sludge (or floc) containing the oxidized material.

The activated sludge process for removing carbonaceous pollution begins with an aeration tank where air (or oxygen) is injected into the waste water. This is followed by a settling tank to allow the biological flocs (the sludge blanket) to settle, thus separating the biological sludge from the clear treated water. Part of the waste sludge is recycled to the aeration tank and the remaining waste sludge is removed for further treatment and ultimate disposal.

Plant types include package plants, oxidation ditch, deep shaft/vertical treatment, surface-aerated basins, sequencing batch reactors (SBRs). Aeration methods include diffused aeration, surface aerators (cones) or, rarely, pure oxygen aeration.

Sludge bulking can occur which makes activated sludge difficult to settle and frequently has an adverse impact on final effluent quality. Treating sludge bulking and managing the plant to avoid a recurrence requires skilled management and may require full-time staffing of a works to allow immediate intervention. A new development of the activated sludge process is the Nereda process which produces a granular sludge that settles very well.