Arcata Marsh clarifiers: Difference between revisions

Revision as of 04:44, 10 May 2008

Introduction

After passing through the Headworks where large solids, objects and particles are removed, the wastewater moves on to the primary clarifiers. Primary clarifiers, also known as sedimentation tanks, are used in wastewater treatment plants to remove solid materials from the water being processed. The Arcata Wastewater Treatment Plant uses two clarifiers, one 26ft diameter tank and one 60ft diameter tank Figure 1.

Clarifiers

File:Clarifier Drawing (800pix).gif

Figure 2. ^[1] Cross-sectional diagram of a primary clarifier.

Influent

Wastewater enters the clarifier through the influent well Figure 2 in the center of the tank.

Settling

Once the water enters the tank solids begin to settle out of the water; the denser solids(sludge) settle to the bottom of the tank and less dense solids(scum) and oils float to the surface.

Scum

The floating scum is skimmed off of the surface by a large rotating arm called the surface skimmer Figure 3. Once collected by the surface skimmer the scum is deposited into the scum trough and is transported to a storage container alongside the clarifier Figure 4.

Sludge

The sludge on the bottom of the tank gets collected by rotating collector arms which moves the sludge to the center of the tank. Once the sludge collects at the bottom of the tank it gets pumped to the digester to be processed and converted into biogas.

Effluent

MORE TEXT WILL GO HERE

Links

References

Davis, Mackenzie, and Susan Masten. Principles of Environmental Engineering and Science. McGraw Hill: New York, NY 2004.
http://www.en.wikipedia.org/wiki/Sewage_treatment#Sedimentation
http://www.gc3.com/techdb/manual/clartext.htm
http://www.humboldt.edu/~ere_dept/marsh/flow2.html
*http://www.humboldt.edu/~ere_dept/marsh/specs.html
http://www.ragsdaleassociates.com/PrimaryTreatment.doc
http://www.usace.army.mil/publications/armytm/tm5-814-3/chap11.pdf
http://www.water.me.vccs.edu/courses/newENV110/Lesson5_print.htm

↑ http://www.gc3.com/techdb/manual/clartext.htm http://www.gc3.com/techdb/manual/clartext.htm

[Figure_2.-1] ttp://www.gc3.com/techdb/manual/clartext.htm http://www.gc3.com/techdb/manual/clartext.htm

[1]

@@ Line 11: / Line 11: @@
-==Description==
+==Clarifiers==
-[[Image:Arcata - Skimmer.jpg|thumb|400px|right|Figure 2. The surface skimmer in the 60ft tank.]]
+[[Image:Clarifier_Drawing_(800pix).gif|thumb|400px|right|Figure 2.
-[[Image:Clarifier_Drawing_(800pix).gif|thumb|400px|right|Figure 3.
+<ref name='Figure 2.'>http://www.gc3.com/techdb/manual/clartext.htm http://www.gc3.com/techdb/manual/clartext.htm</ref> Cross-sectional diagram of a primary clarifier.]]
-<ref name='Figure 3.'>http://www.gc3.com/techdb/manual/clartext.htm http://www.gc3.com/techdb/manual/clartext.htm</ref> Cross-sectional diagram of a primary clarifier.]]
-Wastewater enters the clarifier through the influent well [http://www.appropedia.org/Image:Clarifier_Drawing_%28800pix%29.gif Figure 3] in the center of the tank. Once the water enters the tank solids begin to settle out of the water; the denser solids(sludge) settle to the bottom of the tank and less dense solids(scum) and oils float to the surface. The floating scum is skimmed off of the surface by a large rotating arm called the surface skimmer [http://www.appropedia.org/Image:Arcata_-_Skimmer.jpg Figure 2]. Once collected by the surface skimmer the scum is deposited into the scum trough and is transported to a storage container alongside the clarifier [http://www.appropedia.org/Image:Dumpster_%28600pix%29.jpg Figure 4]. The sludge on the bottom of the tank gets collected by rotating collector arms which moves the sludge to the center of the tank. Once the sludge collects at the bottom of the tank it gets pumped to the [http://www.appropedia.org/Arcata_marsh_digester digester] to be processed and converted into [http://www.appropedia.org/Biogas biogas].
+===Influent===
+Wastewater enters the clarifier through the influent well [http://www.appropedia.org/Image:Clarifier_Drawing_%28800pix%29.gif Figure 2] in the center of the tank.
+<br clear="all" />
+[[Image:Arcata - Skimmer.jpg|thumb|400px|right|Figure 3. The surface skimmer in the 60ft tank.]]
+===Settling===
+Once the water enters the tank solids begin to settle out of the water; the denser solids(sludge) settle to the bottom of the tank and less dense solids(scum) and oils float to the surface.
+====Scum====
+The floating scum is skimmed off of the surface by a large rotating arm called the surface skimmer [http://www.appropedia.org/Image:Arcata_-_Skimmer.jpg Figure 3]. Once collected by the surface skimmer the scum is deposited into the scum trough and is transported to a storage container alongside the clarifier [http://www.appropedia.org/Image:Dumpster_%28600pix%29.jpg Figure 4].
 [[Image:Dumpster (600pix).jpg|thumb|200px|left|Figure 4. Floating solids and oils are deposited into this dumpster after being skimmed off of the surface.]]<br />
+====Sludge====
+The sludge on the bottom of the tank gets collected by rotating collector arms which moves the sludge to the center of the tank. Once the sludge collects at the bottom of the tank it gets pumped to the [http://www.appropedia.org/Arcata_marsh_digester digester] to be processed and converted into [http://www.appropedia.org/Biogas biogas].
+===Effluent===
 MORE TEXT WILL GO HERE
@@ Line 34: / Line 52: @@
 *[http://www.humboldt.edu/~ere_dept/marsh/flow2.html http://www.humboldt.edu/~ere_dept/marsh/flow2.html]
 *[http://www.humboldt.edu/~ere_dept/marsh/specs.html *http://www.humboldt.edu/~ere_dept/marsh/specs.html]
-*[http://www.google.com/search?q=cache:imfHcSlgo14J:www.nmenv.state.nm.us/swqb/FOS/Training/WSOC_Study_Guide/NM_Water_System_Operator_Certification_Study_Guide.pdf http://www.nmenv.state.nm.us/swqb/FOS/Training/WSOC_Study_Guide/NM_Water_System_Operator_Certification_Study_Guide.pdf]
 *[http://209.85.173.104/search?q=cache:umgNlgFJLkQJ:www.ragsdaleassociates.com/PrimaryTreatment.doc http://www.ragsdaleassociates.com/PrimaryTreatment.doc]
 *[http://www.usace.army.mil/publications/armytm/tm5-814-3/chap11.pdf http://www.usace.army.mil/publications/armytm/tm5-814-3/chap11.pdf]