EP1456136A1 - Procede et dispositif pour le traitement biologique d efflue nts fortement charges en ammonium - Google Patents
Procede et dispositif pour le traitement biologique d efflue nts fortement charges en ammoniumInfo
- Publication number
- EP1456136A1 EP1456136A1 EP02799105A EP02799105A EP1456136A1 EP 1456136 A1 EP1456136 A1 EP 1456136A1 EP 02799105 A EP02799105 A EP 02799105A EP 02799105 A EP02799105 A EP 02799105A EP 1456136 A1 EP1456136 A1 EP 1456136A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- effluent
- reactor
- alkalinity
- measuring
- ammonium
- 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- Withdrawn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
- 238000000034 method Methods 0.000 title claims abstract description 43
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 title claims abstract description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002028 Biomass Substances 0.000 claims abstract description 13
- 238000005273 aeration Methods 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 9
- 230000000593 degrading effect Effects 0.000 claims abstract description 3
- 239000010802 sludge Substances 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims 1
- 239000011324 bead Substances 0.000 claims 1
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 8
- 238000003756 stirring Methods 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 abstract 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 150000002826 nitrites Chemical class 0.000 description 6
- 150000002823 nitrates Chemical class 0.000 description 5
- -1 wastewater treatment Substances 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 241000605159 Nitrobacter Species 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 241001388119 Anisotremus surinamensis Species 0.000 description 1
- 206010002660 Anoxia Diseases 0.000 description 1
- 241000976983 Anoxia Species 0.000 description 1
- 241000193830 Bacillus <bacterium> Species 0.000 description 1
- 241000588881 Chromobacterium Species 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 241000192041 Micrococcus Species 0.000 description 1
- 241000605122 Nitrosomonas Species 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 241000589516 Pseudomonas Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000007953 anoxia Effects 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000003348 petrochemical agent Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C02F3/08—Aerobic processes using moving contact bodies
- C02F3/085—Fluidized beds
-
- 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
- C02F3/006—Regulation methods for biological 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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- 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 invention relates to the field of biological treatment of liquid effluents. More specifically, the invention relates to the field of biological treatment of effluents containing a high content of dissolved ammoniacal nitrogen nitrogen (N-NH 4 + ).
- effluents come in particular from the food industry, petrochemicals, iron and steel, chemicals, wastewater treatment, waste treatment, etc.
- They can thus consist for example of leachate from landfills from storage of household waste, leachate from intensive animal husbandry, refining effluents, synthesis gas chemistry, ammonia water from coking plants, purges from gas washing workshops blast furnaces, effluents from the washing of smoke and / or gasification of coal, water highly charged with ammonium, generated by the anaerobic treatment of waste water, waste water containing ammonium, treated beforehand for their carbon, liquids from physical, biological, chemical or mixed treatment of sludge from treatment plants or their storage, in particular leachates from heaps of spreading sludge, monitoring digesters, etc.
- the biological methods for treating nitrogen pollution known from the prior art involve two steps: a nitrification step and a denitrification step of the effment.
- the nitrification stage is carried out using a biomass which converts, in the presence of oxygen, the dissolved soluble ammoniacal nitrogen (N-NH 4 + ) into nitrites and nitrates.
- the biomass used in this context consists of autotrophic bacteria, for example Nitrosomonas and Nitrobacter, which use inorganic carbon as a carbon source to develop.
- the denitrification step is carried out using a biomass which transforms the nitrites and nitrates into molecular nitrogen gas.
- These heterotrophic microorganisms which may for example be of the Bacillus, Chromobacterium, Micrococcus, Pseudomonas and Spirilium type, use the oxygen bound to the nitrites and to the nitrates.
- the denitrification step is therefore carried out in anoxia.
- This denitrifying biomass uses the assimilable organic carbon present in the environment as a carbon source.
- the nitrification step is often inhibited by the transformation of ammonium ions into nitrites or by that of nitrite ions into nitrous acid.
- Nitrobacters are the most sensitive organisms. There is therefore an undesirable accumulation of nitrites in the medium which can no longer be transformed into nitrates.
- the steps of nitrification and denitrification can be carried out either in separate reactors, one operating with aeration the other without aeration, or in the same reactor with a sequenced aeration making it possible to spare aeration periods and anoxic periods within the reactor, periods conducive to the implementation of the nitrification and denitrification steps.
- Yet another drawback of using the conventional nitrification / denitrification process for the treatment of effluents highly charged with ammonium consists in the fact that in this case it leads to significant production of sludge. However, in all effluent treatment processes, it is sought to reduce the quantity of sludge produced.
- the object of the present invention is to propose a method or an installation making it possible to solve these various problems.
- an objective of the present invention is to propose a process for treating effluents heavily loaded with dissolved ammonia pollution that is simpler than the conventional nitrification / denitrification process.
- Yet another objective of the present invention is to provide a process leading to the production of little sludge.
- an objective is to propose a method and an installation making it possible to design compact treatment systems.
- the invention relates to a process for the biological treatment of effluents highly charged with dissolved soluble ammoniacal nitrogen (N-NH 4 + ), characterized in that it comprises a step consisting in passing said effluent through a reactor containing a biomass at least partially fixed on a support having a high specific surface greater than or equal to 500 m 2 / m 3 , said biomass being capable of degrading the ammonium contained in the effluent up to the stage of molecular nitrogen gas, said step being carried out with continuous moderate aeration, without stirring and with or without very little external supply of biodegradable carbon and with a minimum of alkaline reagents relative to the amount of ammonium to be treated as indicated below.
- the method according to the invention can be more effectively implemented when the N-NH 4 + / BOD 5 ratio is greater than 2.2, preferably 4.4, which corresponds to a Corg / N-NH ratio. 4 + less than or equal to 0.45, preferably 0.22.
- the invention therefore makes it possible to overcome the need to implement aerobic periods or zones and anoxic periods or zones to treat nitrogen pollution and, a priori surprisingly, allows such treatment with moderate aeration. keep on going.
- the process therefore induces, compared to the conventional process of nitrification / denitrification, substantial savings, both on the oxygen source (saving on the order of 25%) and on the carbon source (saving on the order of 99.5% to 100%).
- Another observed advantage of the process resides in the fact that it allows a very rapid start of the nitrogen treatment, in practice in less than 10 days, which represents a gain of more than a week compared to a conventional treatment. by nitrification / denitrification, as well as a warm-up time of less than a month and a half with an elimination rate of N-NH 4 + of at least 90%.
- Another advantage of the process according to the invention is that it better resists supply shocks. It also leads to the production of little sludge, which saves money on the basins necessary for the production and storage thereof, as well as on everything related to their possible treatment and / or disposal.
- Another advantageous advantage of the process according to the invention also consists in the fact that a higher nitrogen / phosphorus ratio compared to that of a conventional nitrification / denitrification does not harm the microorganisms involved in it.
- these microorganisms it should be noted that they can develop from the effluent itself or be brought in by sowing.
- the method according to the invention can be used:
- the supports used in the context of the process according to the invention may be of mineral, natural organic or synthetic nature.
- materials of mineral origin mention may be made of sand, activated carbon or not, shale, clay, magnetite.
- materials of organic origin mention may be made of polystyrene, polyethylene, polyethylene glycol, polyurethane, nylon, foams. This list is not exhaustive.
- the support used will be chosen from the group consisting of balls, grains, Raschig rings, saddles, partitioned tubes, filaments or threads as well as fibrous materials in general.
- said support consists of threads or filaments linked together and which can, for example, form pompoms such as those forming the subject of French patent FR2681798 published on April 2, 1993.
- the process is carried out at a temperature between 15 ° C and 30 ° C, preferably between 20 ° C and 25 ° C.
- the invention also has the advantage of not requiring, in most cases, heating of the effluent to be treated.
- the method is implemented with a hydraulic retention time of the effluent in said reactor of between 0.3 and 2 days, preferably between 1 and 1.5 days.
- the continuous aeration is carried out so as to maintain an oxygen level in the effluent present in the reactor less than or equal to 0.7 mg / 1, preferably between 0.3 and 0.7 mg / 1 .
- the method comprises a complementary step of regulating the alkalinity of the effluent which preferably consists in measuring at the inlet of the reactor a parameter representative of the alkalinity of the effluent, preferably the alkalimetric rate complete (TAC) of the effluent and in parallel the measurement of ammonium, if necessary, to add at least one alkaline reagent to the effluent, if the value of said parameter representative of the measured alkalinity is less than a threshold predetermined.
- TAC alkalimetric rate complete
- the process also includes a step of measuring the pH of the effluent which may be located, preferably in the reactor, as well as a step consisting in triggering an alarm when the parameters representative of the alkalinity and / or of the pH of the effluent exceed or are below a predetermined value and / or out of a range of predetermined values.
- the invention also relates to a device for implementing such a method comprising a reactor provided with means for supplying the effluent to be treated, supports accommodating a biomass, means of continuous aeration, means of evacuating sludge and means of evacuating the treated effluent, characterized in that it comprises means for measuring and rectifying the alkalinity of the effluent entering said device.
- said means for rectifying the alkalinity include means for measuring a parameter representative of the alkalinity of the effluent, preferably the TAC thereof, and for measuring the ammonium parameter, as well as means for 'contribution of at least one alkaline reagent to the effluent.
- the device also comprises means for measuring and controlling the pH of the effluent, preferably in the reactor.
- the device comprises alarm means capable of being triggered when the parameters representative of the alkalinity and / or of the pH of the effluent exceed or are below a predetermined value and / or come out of a range of predetermined values.
- the device includes a reactor 1 provided with means 2 for supplying the effluent to be treated, supports 3 receiving a biomass which is in the form supported by pompons of filaments, continuous aeration means 4 , means for discharging the sludge 5 and means for discharging the treated effluent 6.
- this method comprises means for rectifying the alkalinity of the effluent entering said device including means 7 for measuring the TAC and ammonium in the effluent and means 8 for supplying alkaline reagent to it
- the device also includes means 9 for measuring the pH of the effluent in the reactor.
- the method according to the invention was implemented using this device with effluents of two types under the conditions set out in Table 1 below.
- the effluent used had the average composition, or the ranges of values, according to Table 2 below:
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Activated Sludge Processes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0116776 | 2001-12-21 | ||
| FR0116776A FR2833940B1 (fr) | 2001-12-21 | 2001-12-21 | Procede et dispositif pour le traitement biologique d'effluents fortement charges en ammonium |
| PCT/FR2002/004475 WO2003053867A1 (fr) | 2001-12-21 | 2002-12-19 | Procede et dispositif pour le traitement biologique d'effluents fortement charges en ammonium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1456136A1 true EP1456136A1 (fr) | 2004-09-15 |
Family
ID=8870925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02799105A Withdrawn EP1456136A1 (fr) | 2001-12-21 | 2002-12-19 | Procede et dispositif pour le traitement biologique d efflue nts fortement charges en ammonium |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1456136A1 (fr) |
| AU (1) | AU2002364331A1 (fr) |
| FR (1) | FR2833940B1 (fr) |
| WO (1) | WO2003053867A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4009099A (en) * | 1974-07-12 | 1977-02-22 | Ecolotrol, Inc. | Apparatus and process for removing ammonia nitrogen from waste water |
| US5013442A (en) * | 1990-02-09 | 1991-05-07 | Davis Water & Waste Industries, Inc. | Aerobic wastewater treatment with alkalinity control |
| US5747311A (en) * | 1995-08-22 | 1998-05-05 | Microgen Corporation | Process for chemical modification of reactants by microbes |
| DE29519886U1 (de) * | 1995-12-15 | 1996-02-01 | E.V.U. -Entwicklung von Umwelttechnik GmbH, 01277 Dresden | Einbecken-Kläranlage |
| GB2333522B (en) * | 1998-01-23 | 2002-12-04 | Aw Creative Technologies Ltd | Water treatment |
-
2001
- 2001-12-21 FR FR0116776A patent/FR2833940B1/fr not_active Expired - Fee Related
-
2002
- 2002-12-19 AU AU2002364331A patent/AU2002364331A1/en not_active Abandoned
- 2002-12-19 EP EP02799105A patent/EP1456136A1/fr not_active Withdrawn
- 2002-12-19 WO PCT/FR2002/004475 patent/WO2003053867A1/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO03053867A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003053867A1 (fr) | 2003-07-03 |
| AU2002364331A1 (en) | 2003-07-09 |
| FR2833940B1 (fr) | 2004-10-29 |
| FR2833940A1 (fr) | 2003-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Alinsafi et al. | Nitrite effect on nitrous oxide emission from denitrifying activated sludge | |
| Gonzalez-Tineo et al. | Performance improvement of an integrated anaerobic-aerobic hybrid reactor for the treatment of swine wastewater | |
| KR101272016B1 (ko) | 생물막 및 호기성 그래뉼 슬러지를 이용한 하·폐수처리 장치 및 방법 | |
| Zhang et al. | Deammonification for digester supernatant pretreated with thermal hydrolysis: overcoming inhibition through process optimization | |
| FR2503690A1 (fr) | Procede pour eliminer le phosphore contenu dans des liquides organiques residuaires | |
| Gupta et al. | Simultaneous carbon and nitrogen removal in a mixed culture aerobic RBC biofilm | |
| FR2701704A1 (fr) | Procédé de traitement des déchets organiques par oxydation. | |
| JPH01135592A (ja) | 廃水の生物学的浄化方法 | |
| Rajapakse et al. | Denitrification with natural gas and various new growth media | |
| Tam et al. | Significance of external carbon sources on simultaneous removal of nutrients from wastewater | |
| EP0433139A1 (fr) | Réacteur et procédé de nitrification biologique aérobie d'effluents et support de biomasse nitrifiante | |
| FR2913234A1 (fr) | Procede et installation de traitement d'eaux usees contenant des sulfures et de l'ammonium. | |
| Aboutboul et al. | Anaerobic treatment of intensive fish culture effluents: volatile fatty acid mediated denitrification | |
| JP4872171B2 (ja) | 生物脱窒装置 | |
| FR2788055A1 (fr) | Procede de purification biologique d'une eau contenant du perchlorate d'ammonium | |
| FR2516071A1 (fr) | Procede par boues activees pour le traitement d'eaux residuaires | |
| Hu et al. | High efficiency and stable partial nitration achieved via gel immobilization | |
| Khan et al. | Effect of carbon dosing on denitrification in an aerated horizontal subsurface flow constructed wetland used for effluent polishing | |
| CN1277942A (zh) | 水和污水的处理系统以及使用该系统的处理方法 | |
| JP5055667B2 (ja) | 生物脱窒方法及び生物脱窒装置 | |
| KR100346910B1 (ko) | 황과 패각을 이용한 독립 영양 탈질 공정 | |
| JP3303665B2 (ja) | 硝化・脱窒方法及び装置 | |
| EP1456136A1 (fr) | Procede et dispositif pour le traitement biologique d efflue nts fortement charges en ammonium | |
| Suchowska-Kisielewicz et al. | The efficiency of nitrogen compounds removal in wastewater treatment plant | |
| EP0498875B1 (fr) | Procede et installation d'epuration biologique des eaux residuaires incluant la denitrification |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20040420 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR |
|
| AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO |
|
| 17Q | First examination report despatched |
Effective date: 20100924 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20160701 |