Arcata Marsh clarifiers: Difference between revisions

Revision as of 20:29, 18 April 2008

Introduction

Wastewater treatment clarifiers, also known as sedimentation tanks, are used in wastewater treatment plants to remove solid materials from the water being processed. The waste water treatment plant at the Arcata Marsh uses two clarifiers, one 26ft diameter tank and one 60ft diameter tank Fig.1.

Description

Wastewater enters the clarifier through the influent well Fig.3 in the center of the tank. Once the water enters the tank solids begin to settle out of the water; the denser solids settle to the bottom of the tank and less dense solids and oils float to the surface. The lfoating solids and oils are skimmed off of the surface by a large rotating arm called the surface skimmer Fig.2. Once collected by the surface skimmer the solids are deposited into a storage container alongside the clarifierFig.4. On the bottom of the tank there are rotating arms called scrapers that collect sludge and move it to the outlet at the center of the tank.

File:Clarifier Drawing (800pix).gif

[Fig.3] Cross-sectional diagram of a primary clarifier.

Links

http://www.humboldt.edu/~smg59/clarifier.html

References

Davis, Mackenzie, and Susan Masten. Principles of Environmental Engineering and Science. McGraw Hill: New York, NY 2004.
http://www.humboldt.edu/~ere_dept/marsh/flow2.html
http://en.wikipedia.org/wiki/Sewage_treatment#Sedimentation
http://www.gc3.com/techdb/manual/clartext.htm

@@ Line 4: / Line 4: @@
 ==Introduction==
-[[Image:Arcata-60ft clarifier.jpg|thumb|400px|left|[fig.1] The 60ft diameter primary clarifier tank at the Arcata plant.]]
+[[Image:Arcata-60ft clarifier.jpg|thumb|400px|left|[Fig.1] The 60ft diameter primary clarifier tank at the Arcata plant.]]
 Wastewater treatment clarifiers, also known as sedimentation tanks, are used in wastewater treatment plants to remove solid materials from the water being processed. The waste water treatment plant at the  [http://www.appropedia.org/Arcata_marsh#Arcata.27s_Wastewater_Plant Arcata Marsh] uses two clarifiers, one 26ft diameter tank and one 60ft diameter tank [http://www.appropedia.org/Image:Arcata-60ft_clarifier.jpg Fig.1].
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@@ Line 12: / Line 12: @@
 ==Description==
-[[Image:Arcata - Skimmer.jpg|thumb|400px|right|[fig.2] The surface skimmer in the 60ft tank.]]
+[[Image:Arcata - Skimmer.jpg|thumb|400px|right|[Fig.2] The surface skimmer in the 60ft tank.]]
-Clarification tanks work by allowing waste water become still enough for solids to settle to the bottom or float to the surface. Floating solids and oils are skimmed off of the surface by a large rotating arm called the surface skimmer [http://www.appropedia.org/Image:Arcata_-_Skimmer.jpg Fig.2]. On the bottom of the tank, which tapers down towards the center, there are rotating arms called scrapers that collect sludge and move it to the outlet at the center of the tank.
+Wastewater enters the clarifier through the influent well [http://www.appropedia.org/Image:Clarifier_Drawing_%28800pix%29.gif Fig.3] in the center of the tank. Once the water enters the tank solids begin to settle out of the water; the denser solids settle to the bottom of the tank and less dense solids and oils float to the surface. The lfoating solids and oils are skimmed off of the surface by a large rotating arm called the surface skimmer [http://www.appropedia.org/Image:Arcata_-_Skimmer.jpg Fig.2]. Once collected by the surface skimmer the solids are deposited into a storage container alongside the clarifier[http://www.appropedia.org/Image:Dumpster_%28600pix%29.jpg Fig.4]. On the bottom of the tank there are rotating arms called scrapers that collect sludge and move it to the outlet at the center of the tank.
 <br clear="all" />
-[[Image:Clarifier_Drawing_(800pix).gif|thumb|400px|right|[fig.3] Cross-sectional diagram of a primary clarifier.]]
+[[Image:Clarifier_Drawing_(800pix).gif|thumb|400px|right|[Fig.3] Cross-sectional diagram of a primary clarifier.]]
-[[Image:Dumpster (600pix).jpg|thumb|200px|right|[fig.4] Floating solids and oils are deposited into this dumpster after being skimmed off of the surface.]]
+[[Image:Dumpster (600pix).jpg|thumb|200px|right|[Fig.4] Floating solids and oils are deposited into this dumpster after being skimmed off of the surface.]]
 <br clear="all" />
-==Resources==
+==Links==
 [http://www.humboldt.edu/~smg59/clarifier.html http://www.humboldt.edu/~smg59/clarifier.html]