FR2342251A1 - Biological purificn. of sewage and industrial effluent - with vacuum removal of dissolved gas and bubbles before sedimentation - Google Patents

Biological purificn. of sewage and industrial effluent - with vacuum removal of dissolved gas and bubbles before sedimentation

Info

Publication number
FR2342251A1
FR2342251A1 FR7705636A FR7705636A FR2342251A1 FR 2342251 A1 FR2342251 A1 FR 2342251A1 FR 7705636 A FR7705636 A FR 7705636A FR 7705636 A FR7705636 A FR 7705636A FR 2342251 A1 FR2342251 A1 FR 2342251A1
Authority
FR
France
Prior art keywords
gas
sedimentation
sewage
dissolved gas
oxygenation
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.)
Pending
Application number
FR7705636A
Other languages
French (fr)
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of FR2342251A1 publication Critical patent/FR2342251A1/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/22—Activated sludge processes using circulation pipes
    • C02F3/226—"Deep shaft" processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0042—Degasification of liquids modifying the liquid flow
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/26—Activated sludge processes using pure oxygen or oxygen-rich gas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physical Water Treatments (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Activated Sludge Processes (AREA)
  • Water Treatment By Sorption (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

One of the stages involves the sepn. of gas from the waste water. The extn. of a large proportion of both gas bubblesand dissolved gas is enhanced by reducing the press. on the surface if the waste water to well below atmos., i.e., to less than 0.4 (pref. 0.3-0.1) bar. In the case of a biological purificn. process comprising oxygenation, e.g. with injected air, followed by a sedimentation stage, the gas removal stage is introduced between oxygenation and sedimentation. A further stage of flotation sepn. may be included between oxygenation and gas removal. Used in the treatment of sewage and industrial effluents, the method removes a high proportion of dissolved gas as well as gas bubbles which, alone, could be satisfactorily eliminated by mechanical agitation. The resulting, more efficient removal of gas leads to better clarification by subsequent sedimentation.
FR7705636A 1976-02-27 1977-02-25 Biological purificn. of sewage and industrial effluent - with vacuum removal of dissolved gas and bubbles before sedimentation Pending FR2342251A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB780776 1976-02-27

Publications (1)

Publication Number Publication Date
FR2342251A1 true FR2342251A1 (en) 1977-09-23

Family

ID=9840127

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7705636A Pending FR2342251A1 (en) 1976-02-27 1977-02-25 Biological purificn. of sewage and industrial effluent - with vacuum removal of dissolved gas and bubbles before sedimentation

Country Status (15)

Country Link
JP (1) JPS52111269A (en)
AU (1) AU2268377A (en)
BE (1) BE851713A (en)
CS (1) CS210626B2 (en)
DD (1) DD128424A5 (en)
DE (1) DE2707986A1 (en)
ES (1) ES456300A1 (en)
FR (1) FR2342251A1 (en)
IN (1) IN144025B (en)
IT (1) IT1074863B (en)
NL (1) NL7702033A (en)
NO (1) NO770658L (en)
PL (1) PL114233B1 (en)
SE (1) SE7702058L (en)
ZA (1) ZA77986B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0013819A1 (en) * 1979-01-15 1980-08-06 Imperial Chemical Industries Plc Process and apparatus for treatment of wastewater
FR2480738A1 (en) * 1980-01-17 1981-10-23 Tech Nles Ste Gle Pour PROCESS AND DEVICE FOR PURIFYING WASTEWATER REQUIRING THE DEGASSING OF SLUDGE SUSPENSIONS
EP0122908A1 (en) * 1983-03-11 1984-10-24 Innova Wiener Innovationsgesellschaft m.b.H. Method of separating polluted liquid mixtures
EP0226715A2 (en) * 1985-09-28 1987-07-01 Alwin Eppler Process and apparatus for the biological denitrification of water

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1115433A (en) * 1979-10-26 1981-12-29 David C.I. Pollock Method for protecting a bioreactor pressurized head tank against extreme surges of influent waste water

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0013819A1 (en) * 1979-01-15 1980-08-06 Imperial Chemical Industries Plc Process and apparatus for treatment of wastewater
FR2480738A1 (en) * 1980-01-17 1981-10-23 Tech Nles Ste Gle Pour PROCESS AND DEVICE FOR PURIFYING WASTEWATER REQUIRING THE DEGASSING OF SLUDGE SUSPENSIONS
EP0122908A1 (en) * 1983-03-11 1984-10-24 Innova Wiener Innovationsgesellschaft m.b.H. Method of separating polluted liquid mixtures
EP0226715A2 (en) * 1985-09-28 1987-07-01 Alwin Eppler Process and apparatus for the biological denitrification of water
EP0226715A3 (en) * 1985-09-28 1988-04-06 Alwin Eppler Process and apparatus for the biological denitrification of water

Also Published As

Publication number Publication date
IT1074863B (en) 1985-04-20
JPS52111269A (en) 1977-09-17
ZA77986B (en) 1977-12-28
IN144025B (en) 1978-03-11
DE2707986A1 (en) 1977-09-01
JPS6143118B2 (en) 1986-09-25
CS210626B2 (en) 1982-01-29
ES456300A1 (en) 1978-01-16
BE851713A (en) 1977-08-22
SE7702058L (en) 1977-08-28
DD128424A5 (en) 1977-11-16
NL7702033A (en) 1977-08-30
PL114233B1 (en) 1981-01-31
AU2268377A (en) 1978-08-31
NO770658L (en) 1977-08-30

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