EP1554222A2 - Procede de reduction des boues d'un traitement biologique de l'eau mettant en oeuvre de l'ozone - Google Patents
Procede de reduction des boues d'un traitement biologique de l'eau mettant en oeuvre de l'ozoneInfo
- Publication number
- EP1554222A2 EP1554222A2 EP03780287A EP03780287A EP1554222A2 EP 1554222 A2 EP1554222 A2 EP 1554222A2 EP 03780287 A EP03780287 A EP 03780287A EP 03780287 A EP03780287 A EP 03780287A EP 1554222 A2 EP1554222 A2 EP 1554222A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ozone
- effluent
- gas
- ozone gas
- sludge
- 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.)
- Ceased
Links
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000010802 sludge Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000011282 treatment Methods 0.000 title claims abstract description 22
- 244000005700 microbiome Species 0.000 claims abstract description 11
- 238000005273 aeration Methods 0.000 claims description 20
- 239000000839 emulsion Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 230000009089 cytolysis Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 239000002028 Biomass Substances 0.000 description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000004064 dysfunction Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000006385 ozonation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
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
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1221—Particular type of activated sludge processes comprising treatment of the recirculated sludge
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
Definitions
- the present invention relates to methods of treating aqueous effluents using a biological step.
- Aerobic biological treatments of effluents generally consist in bringing these effluents into contact with a biomass (microorganisms) which degrades the pollution contained in them by transforming organic molecules into minerals: this is the step commonly called aeration of biological basins.
- the implementation of such treatments leads to a progressive increase in the quantity of biomass and to the need to evacuate the excess biomass commonly called "excess sludge”.
- Excess sludge To deal with the constantly increasing quantity of this excess biological sludge and its disposal, different solutions have been proposed.
- a first family of processes consists in withdrawing this excess sludge at the end of the biological treatment and either finding a suitable outlet for it or treating it during a specific degradation step. They can thus be used as fertilizer in agriculture (spreading).
- solutions consist in carrying out a partial lysis of the sludge, that is to say destroying a part of the microorganisms which make up the sludge by making it partially soluble.
- the products from this lysis which contain at least partially soluble organic compounds can then be sent to the top of the effluent treatment to undergo the biological treatment, during which the microorganisms will treat the products from the lysis.
- a first known lysis technique consists in exerting a mechanical action on the sludge coming from the biological treatment basin which causes the bursting of part of the cells of the micro- organisms constituting excess sludge. It can be a mechanical grinding, compression / expansion technique, sonochemistry, ...
- a second lysis technique is a basic or acid attack using chemical agents possibly coupled with a rise in temperature, but this technique requires the pH of the solution obtained to be readjusted before it is reinjected into the aeration tank.
- the disadvantage of this solution is that it increases the salinity of the hydrolyzed sludge which can lead to a dysfunction of the biological treatment stage.
- a third lysis technique is based on the action of oxidizing agents such as: ozone, air, hydrogen peroxide or oxygen under pressure.
- the object of the present invention is to propose a new implementation of ozone for the reduction of excess sludge conventionally produced during a biological treatment of water not presenting the implementation difficulties defined above.
- the invention relates to a method for reducing the sludge formed during the biological treatment of an aqueous effluent, said treatment comprising at least one step during which the effluent is brought into contact with microorganisms in a aeration, a process in which an ozone gas comprising at least 2.5 mg of ozone per liter of gas is injected into the aeration tank by means of an apparatus producing an emulsion of the ozone gas in the effluent.
- the invention relates to any type of effluent treatment process in which the effluent is subjected to a biological treatment step.
- This mud generally includes living and dead microorganisms, cellular debris, organic absorbents and colloids, organic corpuscles and / or mineral particles.
- an ozone gas is injected into the aeration tank so as to obtain aeration of the tank and a lysis of the microorganisms contained in the biological mud and thus reduce the formation of excess mud.
- the term ozone gas is understood to mean a gas comprising at least ozone and oxygen.
- a first essential characteristic of the invention is that the ozone gas is injected directly into the aeration tank.
- a second essential characteristic concerns the composition of the ozone gas which must comprise at least 2.5 mg of ozone per liter of gas.
- this ozone gas comprises at most 300 mg of ozone per liter of gas.
- the ozone gas is injected directly into the aeration tank by means of a device producing an emulsion of the ozone gas in the effluent.
- a device producing an emulsion of the ozone gas in the effluent will be used.
- the use of these devices generally makes it possible to transfer almost all of the ozone in the effluent and thus to have no environmental risk of rejection of ozone to the atmosphere. This is due to the fact that the solubility of ozone in water is approximately ten times higher than that of oxygen and its reactivity in the effluent very fast (during the tests, no residual ozone was detected on the mixture of effluent and biological sludge leaving the aeration tank).
- the means for transferring the ozone gas into the effluent may be composed of a venturi supplied by a pump and comprising a means for injecting gas into the narrow part of the venturi.
- the pump makes it possible to circulate the effluent from the aeration tank in the venturi and the gas injection means injects the ozone gas into the effluent stream created by the venturi and the pump.
- An ozone gas / liquid effluent emulsion then occurs which is diffused in the aeration tank. This diffusion can be improved by means of nozzles and ejectors placed after the venturi in the direction of the flow of the effluent.
- the means for transferring the ozone gas into the effluent may be composed of a turbine and of a means for injecting gas into the turbine.
- this device is composed of a self-aspirating turbine and a propeller, said self-aspirating turbine and said propeller being carried by the same hollow drive shaft, and said hollow shaft ensuring the supply of ozone gas of the turbine. More specifically, this type of device comprises a drive device placed above the liquid to be agitated and provided with a shaft equipped at its lower end with at least one axial flow mobile immersed in the liquid.
- the shaft also carries the self-aspirating turbine immersed in the liquid and which can be driven by the shaft.
- the shaft is wrapped coaxially by a cylinder linked at its upper end in a sealed manner to the drive device and the lower end of which opens into the turbine.
- the upper end of the cylinder is pierced with an ozone gas injection opening in an annular interval delimited by the shaft and the cylinder.
- the liquid is stirred by the turbine. By turning, it sucks the ozone gas through the annular space of the shaft and diffuses it into the liquid at the level of the turbine.
- the gas / liquid dispersion thus created is very widely distributed in the aeration tank via the turbine and the propeller generally placed under said turbine.
- This injection means is described in application EP-A1 -0 995485. This type of device is marketed by Air Liquide under the reference Turboxal ® .
- the means for transferring the ozone gas into the effluent have the advantage of exhibiting very good transfer yields and an effect of partial destructuring of the biological flocs (disaggregation of the flocs, or even destruction of the cell walls of the microorganisms). This destructuring effect of the flocs increases the efficiency of ozone for the reduction of biomass.
- the ozone gas can come directly from an ozone generator or from another step in the effluent treatment process which also uses an ozone gas.
- the ozone gas can be the residual ozone gas coming from a gas vent (recycling). Due to the very rapid decomposition of ozone in aqueous effluents and its high solubility in these effluents, the transfer of ozone in these effluents is close to 100% and the formation of ozone at the surface of the basins. ventilation is avoided.
- the method according to the invention has the advantage of combining in a single step: the at least partial aeration of the biological basin by means of oxygen from the ozone gas and sludge reduction by means of the high amount of ozone in the ozone gas.
- a basin 9 m deep and 6000 m 3 in volume is aerated using two Ventoxal devices. Each Ventoxal device injects 53 Nm 3 / h of oxygen corresponding to the hourly need for ventilation.
- the production of excess organic sludge extracted each day to keep the concentration of sludge in the aerated tank constant is 460 kg / d.
- the oxygen from one of the two Ventoxal devices is doped with 17 mg / l of ozone.
- Daily sludge production drops to 320 kg / d, a reduction of 30%.
- An improvement in the sludge index is also observed as well as an ease of dewatering of the excess of remaining sludge.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0212593 | 2002-10-10 | ||
| FR0212593A FR2845682B1 (fr) | 2002-10-10 | 2002-10-10 | Procede de reduction des boues d'un traitement biologique de l'eau mettant en oeuvre de l'ozone |
| PCT/FR2003/050075 WO2004033371A2 (fr) | 2002-10-10 | 2003-10-02 | Procede de reduction des boues d'un traitement biologique de l'eau mettant en oeuvre de l'ozone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1554222A2 true EP1554222A2 (fr) | 2005-07-20 |
Family
ID=32039603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03780287A Ceased EP1554222A2 (fr) | 2002-10-10 | 2003-10-02 | Procede de reduction des boues d'un traitement biologique de l'eau mettant en oeuvre de l'ozone |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US7335304B2 (fr) |
| EP (1) | EP1554222A2 (fr) |
| AU (1) | AU2003288372A1 (fr) |
| BR (1) | BR0315210B1 (fr) |
| CA (1) | CA2501387A1 (fr) |
| FR (1) | FR2845682B1 (fr) |
| WO (1) | WO2004033371A2 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT202100017066A1 (it) | 2021-06-29 | 2022-12-29 | Soc It Acetilene E Derivati S I A D S P A In Breve S I A D S P A | Impianto di trattamento di acque reflue con riduzione dei flussi nocivi in uscita attraverso integrazione e recupero dei flussi gassosi ricchi in ossigeno e ozono con sistemi a basso consumo energetico |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7513999B2 (en) | 2006-09-29 | 2009-04-07 | Praxair Technology, Inc. | Ozonation of wastewater for reduction of sludge or foam and bulking control |
| US7309432B1 (en) | 2006-09-29 | 2007-12-18 | Praxair Technology, Inc. | System and method for eliminating sludge via ozonation |
| CN103974910B (zh) | 2011-12-01 | 2016-10-19 | 普莱克斯技术有限公司 | 用于在废水处理系统中进行污泥臭氧化的方法和系统 |
| EP2636650A1 (fr) | 2012-03-09 | 2013-09-11 | MCI Management Center Innsbruck - Internationale Hochschule GmbH | Installation et procédé biologique avec traitement de gaz au moins partiellement ionisé |
| US10683221B2 (en) | 2017-12-14 | 2020-06-16 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Gas injection and recycling apparatus and methods |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3099839B2 (ja) * | 1990-11-07 | 2000-10-16 | 味の素株式会社 | 活性汚泥法による廃水処理方法 |
| US5411633A (en) * | 1991-04-30 | 1995-05-02 | Kamyr, Inc. | Medium consistency pulp ozone bleaching |
| JPH0639390A (ja) * | 1991-06-11 | 1994-02-15 | Central Res Inst Of Electric Power Ind | ばっ気処理におけるバルキング防止方法 |
| JP2621699B2 (ja) * | 1991-07-19 | 1997-06-18 | 日立プラント建設株式会社 | 汚水の処理方法及び装置 |
| FR2784311B1 (fr) | 1998-10-09 | 2000-12-08 | Air Liquide | Dispositif d'agitation d'un liquide dans un reacteur et d'injection d'un gaz dans ce liquide |
| DE19920269A1 (de) * | 1999-05-03 | 2001-03-08 | Philaqua Aufbereitungstechnik | Direkte Ozonung von biologischen Belebungsstufen in Abwasserkläranlagen zum Zwecke der Reduzierung von Überschußschlamm |
| FR2798924B1 (fr) * | 1999-09-24 | 2001-11-30 | Degremont | Procede d'elimination de la matiere organique refractaire au traitement biologique |
-
2002
- 2002-10-10 FR FR0212593A patent/FR2845682B1/fr not_active Expired - Lifetime
-
2003
- 2003-10-02 US US10/530,850 patent/US7335304B2/en not_active Expired - Lifetime
- 2003-10-02 WO PCT/FR2003/050075 patent/WO2004033371A2/fr not_active Ceased
- 2003-10-02 EP EP03780287A patent/EP1554222A2/fr not_active Ceased
- 2003-10-02 BR BRPI0315210-3A patent/BR0315210B1/pt active IP Right Grant
- 2003-10-02 CA CA 2501387 patent/CA2501387A1/fr not_active Abandoned
- 2003-10-02 AU AU2003288372A patent/AU2003288372A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004033371A2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT202100017066A1 (it) | 2021-06-29 | 2022-12-29 | Soc It Acetilene E Derivati S I A D S P A In Breve S I A D S P A | Impianto di trattamento di acque reflue con riduzione dei flussi nocivi in uscita attraverso integrazione e recupero dei flussi gassosi ricchi in ossigeno e ozono con sistemi a basso consumo energetico |
| EP4112568A1 (fr) | 2021-06-29 | 2023-01-04 | Societa' Italiana Acetilene & Derivati S.I.A.D. S.p.A. in breve S.I.A.D. S.p.A. | Récupération de flux gazeux riches en oxygène et en ozone dans une station d'épuration des eaux usée |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004033371A3 (fr) | 2004-07-15 |
| CA2501387A1 (fr) | 2004-04-22 |
| BR0315210A (pt) | 2005-08-16 |
| FR2845682B1 (fr) | 2004-11-19 |
| BR0315210B1 (pt) | 2012-02-07 |
| US20060086661A1 (en) | 2006-04-27 |
| AU2003288372A8 (en) | 2004-05-04 |
| AU2003288372A1 (en) | 2004-05-04 |
| FR2845682A1 (fr) | 2004-04-16 |
| WO2004033371A2 (fr) | 2004-04-22 |
| US7335304B2 (en) | 2008-02-26 |
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Legal Events
| Date | Code | Title | Description |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: JALBERT, CHRISTIAN Inventor name: CLUZEAU, JEROME Inventor name: CAMPO, PHILIPPE |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'E |
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