FR2453831A1 - Sludge extn. from decanting tank with rotary bridge - via concentric ring of suction inlets which avoid sludge agitation - Google Patents

Sludge extn. from decanting tank with rotary bridge - via concentric ring of suction inlets which avoid sludge agitation

Info

Publication number
FR2453831A1
FR2453831A1 FR7909132A FR7909132A FR2453831A1 FR 2453831 A1 FR2453831 A1 FR 2453831A1 FR 7909132 A FR7909132 A FR 7909132A FR 7909132 A FR7909132 A FR 7909132A FR 2453831 A1 FR2453831 A1 FR 2453831A1
Authority
FR
France
Prior art keywords
sludge
tank
suction inlets
extn
bridge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7909132A
Other languages
French (fr)
Other versions
FR2453831B1 (en
Inventor
Jean Durot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suez International SAS
Original Assignee
Degremont SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Degremont SA filed Critical Degremont SA
Priority to FR7909132A priority Critical patent/FR2453831A1/en
Publication of FR2453831A1 publication Critical patent/FR2453831A1/en
Application granted granted Critical
Publication of FR2453831B1 publication Critical patent/FR2453831B1/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
    • B01D21/06—Settling tanks with single outlets for the separated liquid with moving scrapers with rotating scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0087—Settling tanks provided with means for ensuring a special flow pattern, e.g. even inflow or outflow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2427—The feed or discharge opening located at a distant position from the side walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/245—Discharge mechanisms for the sediments
    • B01D21/2466—Mammoth pumps, e.g. air lift pumps

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Sludge (AREA)

Abstract

In the system sludge is sucked from the bottom of the tank into a receiver carried by the bridge. The suction inlets which collect the sludge are arranged on the circumference of a circle concentric with the tank. The dia. of the suction inlets circle is pref. equal to about one third of the dia. of the tank. The suction inlets are pref. holes in the underside of an annular pipe near the base of the tank, fixed to the bridge and with risers to the sludge receiver. Alternatively, a ring of risers arranged around and fixed to a central disc can suck directly into the receiver. Since the suction inlets rotate about the centre of the tank and follow each other in an unbroken sequence there is a minimum of disturbance of settled sludge. This results in better clarification of treated water.
FR7909132A 1979-04-11 1979-04-11 Sludge extn. from decanting tank with rotary bridge - via concentric ring of suction inlets which avoid sludge agitation Granted FR2453831A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7909132A FR2453831A1 (en) 1979-04-11 1979-04-11 Sludge extn. from decanting tank with rotary bridge - via concentric ring of suction inlets which avoid sludge agitation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7909132A FR2453831A1 (en) 1979-04-11 1979-04-11 Sludge extn. from decanting tank with rotary bridge - via concentric ring of suction inlets which avoid sludge agitation

Publications (2)

Publication Number Publication Date
FR2453831A1 true FR2453831A1 (en) 1980-11-07
FR2453831B1 FR2453831B1 (en) 1983-09-16

Family

ID=9224204

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7909132A Granted FR2453831A1 (en) 1979-04-11 1979-04-11 Sludge extn. from decanting tank with rotary bridge - via concentric ring of suction inlets which avoid sludge agitation

Country Status (1)

Country Link
FR (1) FR2453831A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008068773A1 (en) * 2006-12-07 2008-06-12 Council Of Scientific & Industrial Research Circular secondary clarifier for the wastewater treatment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568452A (en) * 1949-05-31 1951-09-18 Process Engineers Inc Clarification
GB685544A (en) * 1949-12-16 1953-01-07 Cyril John Hartley Improvements in and relating to settlement tanks
DE1074512B (en) * 1954-11-19 1960-01-28 Ing Adolf Sam biaus Lüneburg Dr Circular abdominal basin
FR2320909A1 (en) * 1975-08-14 1977-03-11 Belmonte Nicolas Removal of sludge from waste water treatment plant - by rotary sweep footbridge with inbuilt suction scraper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568452A (en) * 1949-05-31 1951-09-18 Process Engineers Inc Clarification
GB685544A (en) * 1949-12-16 1953-01-07 Cyril John Hartley Improvements in and relating to settlement tanks
DE1074512B (en) * 1954-11-19 1960-01-28 Ing Adolf Sam biaus Lüneburg Dr Circular abdominal basin
FR2320909A1 (en) * 1975-08-14 1977-03-11 Belmonte Nicolas Removal of sludge from waste water treatment plant - by rotary sweep footbridge with inbuilt suction scraper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008068773A1 (en) * 2006-12-07 2008-06-12 Council Of Scientific & Industrial Research Circular secondary clarifier for the wastewater treatment

Also Published As

Publication number Publication date
FR2453831B1 (en) 1983-09-16

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