EP0863849A1 - Procede d'elimination des composes azotes et de remineralisation d'eaux faiblement mineralisees - Google Patents
Procede d'elimination des composes azotes et de remineralisation d'eaux faiblement mineraliseesInfo
- Publication number
- EP0863849A1 EP0863849A1 EP96929355A EP96929355A EP0863849A1 EP 0863849 A1 EP0863849 A1 EP 0863849A1 EP 96929355 A EP96929355 A EP 96929355A EP 96929355 A EP96929355 A EP 96929355A EP 0863849 A1 EP0863849 A1 EP 0863849A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- biological
- remineralization
- treated
- elimination
- 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.)
- Withdrawn
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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- 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
- C02F3/30—Aerobic and anaerobic processes
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S210/00—Liquid purification or separation
- Y10S210/902—Materials removed
- Y10S210/903—Nitrogenous
Definitions
- the present invention relates to a method for simultaneously ensuring the elimination of nitrogenous compounds, in particular nitrates, and the biological remineralization of weakly mineralized waters before the coagulation, flocculation and clarification treatments.
- the physicochemical processes do not eliminate the nitrates, they only displace them: they are found in the eluates of regeneration which also contain high concentrations of chlorides, or other salts of regeneration; in addition, these processes are sensitive to the presence of organic matter in the water to be treated.
- Biological processes are well suited for the elimination of nitrogen compounds, however, they do not make it possible to eliminate colloidal substances. Furthermore, these processes are dependent on the temperature of the water to be treated and up to now, they have only been used industrially for the treatment of well water having a constant temperature above 10 °. vs.
- the present invention proposes to carry out under particularly economical conditions an elimination of nitrogenous compounds and an at least partial remineralization of weakly mineralized surface waters before carrying out the conventional coagulation, flocculation and clarification.
- the subject of the present invention is therefore a process for the elimination of nitrogenous compounds, in particular nitrates, and for remineralization of weakly mineralized waters, characterized in that, by biological treatment, the elimination of nitrogen compounds and at least partial remineralization of the raw water, the denitrified and remineralized water then being subjected to coagulation, flocculation and clarification treatments.
- the water to be treated, weakly mineralized is brought into contact with a heterotrophic bacterial flora for the elimination of nitrogen compounds, the heterotrophic denitrification biological reaction releasing carbon dioxide which is used directly and immediately to ensure biological remineralization, at least partially, of the water before carrying out the clarification.
- the weakly mineralized raw water to be subjected to the simultaneous biological treatments of elimination of nitrogenous components and remineralization is added with the reagents necessary for the growth and activity of bacteria, that is to say a source of carbon assimilable by heterotrophic bacteria in particular ethanol, acetic acid and phosphorous reagents such as especially phosphoric acid.
- the raw water is then introduced into a single reactor where the elimination of nitrogenous compounds, in particular nitrates and remineralization, at least partial of the raw water, is carried out simultaneously, biologically.
- the water to be treated, weakly mineralized is brought into contact with a heterotrophic bacterial flora ensuring the elimination of nitrogenous compounds and the heterotrophic denitrification biological reaction releases carbon dioxide directly usable to participate in the reaction of remineralization, before the coagulation-flocculation step.
- the elimination of nitrogenous compounds by heterotrophic biological pathway is accompanied by a biological remineralization of the weakly mineralized raw water, in the same reaction zone.
- the contact time in the biological zone is that necessary for the metaboiisation reaction of the nitrogen compounds and for biological remineralization.
- This contact time is also a function of the temperature of the medium. By way of example, it can be indicated that at 12 ° C., this contact time is approximately 7 minutes for an elimination of NO 3 " of 50 mg / liter.
- the heterotrophic denitrifying bacteria, associated with the suspended solids of the raw water form a flock which has the property of being very little clogging in a culture reactor fixed on a material. support of determined particle size and being able to be fluidized in a reactor in free culture.
- the water to be treated is introduced at the base of the single biological reactor and the biological contact zone can be either filled with a granular material allowing the attachment of bacteria to its surface, or empty allowing, from a floc-generating support to constitute a mud bed composed of dense flocs, fluidized by the upward flow of water during treatment.
- the introduction of the water to be treated at the base of the reactor allows the evacuation of all or part of the flocs generated by the biological reaction in the presence of suspended solids and colloids from the water. treat.
- the special character of the floc formed in the biological reactor gives the sludge a cohesion coefficient greater than that obtained with raw water alone, which then makes it possible to achieve better separation, either in decantation or in flotation.
- the coagulation-flocculation step takes place in a more buffered medium since the bicarbonate ions formed during biological denit ⁇ faction ensure the remineralization of the raw water.
- this medium is more stable in terms of pH and the control of the optimal coagulation conditions is easier, which makes it possible, for example, to reduce the residual concentration of Al 3+ ions.
- the water treated in the biological reactor is added with the reagents necessary for the coagulation-flocculation. It receives a coagulant, generally ferric chloride, aluminum sulphate or any other derivative, an acid or alkaline reagent making it possible to obtain the optimal coagulation pH, generally CO2, sulfuric acid, soda or whitewash. It is also possible to use a flocculation aid, for example an anionic polymer of synthesis or of organic origin.
- a coagulant generally ferric chloride, aluminum sulphate or any other derivative
- an acid or alkaline reagent making it possible to obtain the optimal coagulation pH, generally CO2, sulfuric acid, soda or whitewash.
- a flocculation aid for example an anionic polymer of synthesis or of organic origin.
- the water thus denitrified, remineralized, coagulated and flocculated is then clarified by a conventional process, for example by decantation or flotation.
- the process according to the present invention can very easily be integrated into an already existing clarification process comprising, as a clarification reactor, a float or a decanter with a mud bed.
- the method according to the present invention allows significant savings in remineralization reagents.
- the economy achieved by the invention compared to the quantities of CO2 injected in the implementation of conventional remineralization processes of water, is 250 tonnes per year, which represents under current economic conditions, a saving of 450,000 to 500,000 francs per year.
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)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Removal Of Specific Substances (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9510179A FR2738234B1 (fr) | 1995-08-29 | 1995-08-29 | Procede d'elimination des composes azotes et de remineralisation d'eaux faiblement mineralisees |
FR9510179 | 1995-08-29 | ||
PCT/FR1996/001303 WO1997008105A1 (fr) | 1995-08-29 | 1996-08-21 | Procede d'elimination des composes azotes et de remineralisation d'eaux faiblement mineralisees |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0863849A1 true EP0863849A1 (fr) | 1998-09-16 |
Family
ID=9482142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96929355A Withdrawn EP0863849A1 (fr) | 1995-08-29 | 1996-08-21 | Procede d'elimination des composes azotes et de remineralisation d'eaux faiblement mineralisees |
Country Status (11)
Country | Link |
---|---|
US (1) | US6093321A (fr) |
EP (1) | EP0863849A1 (fr) |
JP (1) | JPH11512017A (fr) |
CN (1) | CN1193950A (fr) |
AU (1) | AU698344B2 (fr) |
BR (1) | BR9610038A (fr) |
CA (1) | CA2227965A1 (fr) |
DE (1) | DE863849T1 (fr) |
ES (1) | ES2127165T1 (fr) |
FR (1) | FR2738234B1 (fr) |
WO (1) | WO1997008105A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6365048B1 (en) * | 2000-07-19 | 2002-04-02 | Board Of Trustees Of Michigan State University | Method for treatment of organic matter contaminated drinking water |
FR2823499B1 (fr) * | 2001-04-12 | 2004-02-27 | Vivendi Water Systems | Procede de remineralisation d'une eau brute |
US7771599B1 (en) * | 2009-03-09 | 2010-08-10 | Doosan Hydro Technology, Inc. | System and method for using carbon dioxide sequestered from seawater in the remineralization of process water |
FR2983355B1 (fr) * | 2011-11-25 | 2014-02-14 | Prodose | Procede et dispositifs de remineralisation et de correction de ph d'une eau produite dans un aeronef |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4537682A (en) * | 1982-01-29 | 1985-08-27 | Environmental Research & Technology | Activated sludge wastewater treating process |
DE3340549A1 (de) * | 1983-11-09 | 1985-05-15 | Linde Ag, 6200 Wiesbaden | Verfahren und vorrichtung zur biologischen denitrifikation von wasser |
JPS62152597A (ja) * | 1985-12-25 | 1987-07-07 | Naigai Kagaku Seihin Kk | 廃水処理方法 |
JPS62152593A (ja) * | 1985-12-25 | 1987-07-07 | Naigai Kagaku Seihin Kk | 有機質廃水の処理方法 |
DE3632711C1 (de) * | 1986-09-26 | 1988-06-23 | Gelsenwasser Ag | Verfahren und Vorrichtung zur kontinuierlichen mikrobiologischen Denitrifikation von Grundwasser |
US5022993A (en) * | 1988-06-02 | 1991-06-11 | Orange Water And Sewer Authority | Process for treating wastewater |
SE468985B (sv) * | 1990-09-07 | 1993-04-26 | Johnson Axel Eng Ab | Foerfarande foer rening av avloppsvatten |
US5211847A (en) * | 1991-04-22 | 1993-05-18 | Infilco Degremont Inc. | Denitrification methods |
FR2707621B1 (fr) * | 1993-07-12 | 1995-10-20 | Omnium Traitement Valorisa | Procédé et installation d'épuration d'eau à boues physico-chimiques dénitrifiantes. |
US5705072A (en) * | 1997-02-03 | 1998-01-06 | Haase; Richard Alan | Biotreatment of wastewater from hydrocarbon processing units |
-
1995
- 1995-08-29 FR FR9510179A patent/FR2738234B1/fr not_active Expired - Fee Related
-
1996
- 1996-08-21 US US09/029,035 patent/US6093321A/en not_active Expired - Fee Related
- 1996-08-21 CN CN96196582A patent/CN1193950A/zh active Pending
- 1996-08-21 AU AU68786/96A patent/AU698344B2/en not_active Ceased
- 1996-08-21 JP JP9509908A patent/JPH11512017A/ja active Pending
- 1996-08-21 CA CA002227965A patent/CA2227965A1/fr not_active Abandoned
- 1996-08-21 BR BR9610038A patent/BR9610038A/pt not_active Application Discontinuation
- 1996-08-21 DE DE0863849T patent/DE863849T1/de active Pending
- 1996-08-21 WO PCT/FR1996/001303 patent/WO1997008105A1/fr not_active Application Discontinuation
- 1996-08-21 ES ES96929355T patent/ES2127165T1/es active Pending
- 1996-08-21 EP EP96929355A patent/EP0863849A1/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9708105A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2738234B1 (fr) | 1998-10-30 |
US6093321A (en) | 2000-07-25 |
DE863849T1 (de) | 1999-06-02 |
ES2127165T1 (es) | 1999-04-16 |
BR9610038A (pt) | 1999-07-06 |
WO1997008105A1 (fr) | 1997-03-06 |
CA2227965A1 (fr) | 1997-03-06 |
CN1193950A (zh) | 1998-09-23 |
AU698344B2 (en) | 1998-10-29 |
JPH11512017A (ja) | 1999-10-19 |
FR2738234A1 (fr) | 1997-03-07 |
MX9801545A (es) | 1998-05-31 |
AU6878696A (en) | 1997-03-19 |
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