CH687704A5 - Process for treating wastewater in a treatment plant with a view to eliminating odor nuisances. - Google Patents
Process for treating wastewater in a treatment plant with a view to eliminating odor nuisances. Download PDFInfo
- Publication number
- CH687704A5 CH687704A5 CH01667/94A CH166794A CH687704A5 CH 687704 A5 CH687704 A5 CH 687704A5 CH 01667/94 A CH01667/94 A CH 01667/94A CH 166794 A CH166794 A CH 166794A CH 687704 A5 CH687704 A5 CH 687704A5
- Authority
- CH
- Switzerland
- Prior art keywords
- glyoxal
- hydrogen sulfide
- treatment plant
- view
- aqueous
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 14
- 239000002351 wastewater Substances 0.000 title description 5
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 claims description 41
- 229940015043 glyoxal Drugs 0.000 claims description 21
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 16
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 230000008719 thickening Effects 0.000 claims description 7
- 238000005352 clarification Methods 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 235000019645 odor Nutrition 0.000 description 5
- 239000010802 sludge Substances 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 3
- 239000012736 aqueous medium Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000035755 proliferation Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000003113 alkalizing effect Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000035943 smell Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000003463 sulfur Chemical class 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
Landscapes
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Activated Sludge Processes (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Removal Of Specific Substances (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
- Treating Waste Gases (AREA)
- Physical Water Treatments (AREA)
Description
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CH 687 704 A5 CH 687 704 A5
2 2
Description Description
La présente invention concerne un procédé de traitement des eaux usées dans une station d'épuration en vue d'éliminer les nuisances olfactives. The present invention relates to a process for treating wastewater in a treatment plant in order to eliminate odor nuisance.
Le traitement des eaux usées urbaines et/ou industrielles dans les stations d'épuration génère très souvent des gaz nauséabonds parfois mêmes toxiques tels que l'hydrogène sulfuré (H2S) qui sont, dans la majorité des cas, rejetés à l'état dilué dans l'atmosphère, ce qui engendre une grave nuisance pour le personnel et les riverains de ces stations d'épuration. The treatment of urban and / or industrial wastewater in treatment plants very often generates foul-smelling gases, sometimes even toxic, such as hydrogen sulfide (H2S) which are, in the majority of cases, discharged in the diluted state. the atmosphere, which creates a serious nuisance for the staff and residents of these treatment plants.
Par ailleurs, l'hydrogène sulfuré ainsi que ces divers sels et esters dissous dans les eaux et les boues en cours de traitement favorise le développement de bactéries du genre Thiotrix qui perturbent le bon fonctionnement de la station d'épuration en entravant la décantation des boues. In addition, the hydrogen sulfide and these various salts and esters dissolved in the water and sludge being treated promotes the development of bacteria of the genus Thiotrix which disturb the proper functioning of the treatment plant by hindering the settling of sludge .
Il est connu par la demande de brevet JP-A-58 (83)-112 098 de traiter les boues issues des stations d'épuration avec du glyoxal adsorbé sur un support solide minéral inerte et insoluble dans l'eau tel que le kieselguhr. Il est également connu par le brevet US-A 4 680 127 un procédé pour réduire la concentration en hydrogène sulfuré d'un milieu aqueux en contenant, tout en évitant la formation de dérivés soufrés insolubles dans l'eau, en traitant ce milieu aqueux préalablement amené à un pH neutre ou alcalin, avantageusement à un pH=9 avec une quantité efficace de glyoxal, habituellement dans un rapport molaire glyoxal/hydrogè-ne sulfuré compris entre 1/1 et 2,5/1 et avantageusement dans un rapport molaire de 2,07/1. It is known from patent application JP-A-58 (83) -112,098 to treat sludge from treatment plants with glyoxal adsorbed on an inert mineral solid support insoluble in water such as kieselguhr. It is also known from US Pat. No. 4,680,127 a process for reducing the concentration of hydrogen sulfide in an aqueous medium containing it, while avoiding the formation of sulfur derivatives which are insoluble in water, by treating this aqueous medium beforehand brought to a neutral or alkaline pH, advantageously at pH = 9 with an effective amount of glyoxal, usually in a glyoxal / hydrogen sulfide molar ratio of between 1/1 and 2.5 / 1 and advantageously in a molar ratio of 2.07 / 1.
Enfin, il est également connu par la demande de brevet japonais N° 48-098 042, l'utilisation d'une solution aqueuse de glyoxal réglée à un pH compris entre 5 et 9 pour éliminer les odeurs engendrées par des matières excrémentielles et par les produits de leur traitement. L'ajustement du pH entre 5 et 9 est impératif car les solutions aqueuses de glyoxal commerciales présentant un pH entre 1 et 3 n'ont pratiquement pas d'effet désodorisant et, de plus, elles entraînent une destruction des microorganismes. Finally, it is also known from Japanese patent application No. 48-098 042, the use of an aqueous solution of glyoxal adjusted to a pH between 5 and 9 to eliminate the odors generated by excremental materials and by products of their treatment. Adjusting the pH between 5 and 9 is imperative because the aqueous solutions of commercial glyoxal having a pH between 1 and 3 have practically no deodorizing effect and, moreover, they lead to the destruction of microorganisms.
Si le premier des procédés décrits évite le dégagement d'hydrogène sulfuré par les boues, il ne résout pas le problème causé par les émanations d'hydrogène sulfuré des divers bassins de traitement des eaux dans la station d'épuration. Quant aux deux autres procédés ils exigent d'alcaliniser les eaux à traiter à un pH neutre ou alcalin, ce qui est extrêmement onéreux pour une station d'épuration traitant plusieurs milliers de m3 d'eau par jour. If the first of the described methods avoids the release of hydrogen sulfide by the sludge, it does not solve the problem caused by the fumes of hydrogen sulfide from the various water treatment basins in the treatment plant. As for the other two processes, they require alkalizing the water to be treated to a neutral or alkaline pH, which is extremely expensive for a treatment plant treating several thousand m3 of water per day.
Afin d'obvier à ces inconvénients, la demanderesse a découvert avec étonnement un nouveau procédé permettant l'élimination des nuisances olfactives produites dans les stations d'épuration des eaux usées. In order to overcome these drawbacks, the applicant has discovered with surprise a new process allowing the elimination of odor nuisances produced in wastewater treatment plants.
Le procédé selon l'invention est caractérisé par le fait que l'on injecte, en continu, dans les ef-fluents aqueux issus de bassins de clarification et alimentant des bassins désignés épaississeurs, une solution aqueuse commerciale de glyoxal présentant un pH inférieur à 3. The method according to the invention is characterized in that a continuous aqueous solution of glyoxal having a pH of less than 3 is injected continuously into the aqueous ef-fluents from clarification tanks and supplying tanks designated thickeners .
Dans des conditions préférentielles de mise en œuvre de l'invention, le procédé ci-dessus décrit est réalisé en utilisant: Under preferential conditions for implementing the invention, the process described above is carried out using:
- du glyoxal en solution aqueuse commerciale à 40% en poids, présentant un pH d'environ 2; - glyoxal in a 40% by weight commercial aqueous solution, having a pH of about 2;
- de 1 à 24 moles de glyoxal par mole d'hydrogène sulfuré dissous dans l'effluent aqueux à traiter, soit de 1,7 à 40 g de glyoxal par gramme d'hydrogène sulfuré. - from 1 to 24 moles of glyoxal per mole of hydrogen sulfide dissolved in the aqueous effluent to be treated, ie from 1.7 to 40 g of glyoxal per gram of hydrogen sulfide.
Dans des conditions encore plus préférentielles de mise en œuvre de l'invention, le procédé ci-des-sus décrit est réalisé en utilisant 2,6 ± 0,7 moles de glyoxal par mole d'hydrogène sulfuré dissous dans l'effluent aqueux à traiter, soit environ 4,4 ± 1,2 g de glyoxal par gramme d'hydrogène sulfuré. Under even more preferential conditions for implementing the invention, the process described above is carried out using 2.6 ± 0.7 moles of glyoxal per mole of hydrogen sulfide dissolved in the aqueous effluent to treat, i.e. approximately 4.4 ± 1.2 g of glyoxal per gram of hydrogen sulfide.
Le procédé selon la présente invention permet d'une part d'éliminer les nuisances olfactives de la station aussi bien pour le personnel que pour les riverains et, d'autre part, d'éviter la prolifération de bactéries filamenteuses du genre Thiotrix sans gêner pour autant le bon fonctionnement de la station. Ce dernier résultat est surprenant car il est connu que le glyoxal est un bactéricide puissant, d'autant plus efficace qu'il est utilisé dans une zone de pH inférieur à 5. The method according to the present invention makes it possible on the one hand to eliminate the odor nuisance from the station both for the personnel and for the residents and, on the other hand, to avoid the proliferation of filamentous bacteria of the genus Thiotrix without hampering for the proper functioning of the station. This last result is surprising because it is known that glyoxal is a powerful bactericide, all the more effective when it is used in an area of pH below 5.
Exemple Example
Dans une station d'épuration d'eaux d'égout urbaines traitant 24 000 m3/jour d'eaux usées, l'analyse de l'air au dessus des bassins d'épaississement en aval des bassins de clarification révèle un taux de 1000 vpm (volume par million) d'hydrogène sulfuré et l'analyse des effluents aqueux alimentant les bassins d'épaississement décèle une dose de 21 mg d'hydrogène sulfuré par litre pour un débit de 540 m3/jour. In an urban sewage treatment plant treating 24,000 m3 / day of wastewater, the analysis of the air above the thickening tanks downstream of the clarification tanks reveals a rate of 1000 vpm (volume per million) of hydrogen sulfide and the analysis of the aqueous effluents supplying the thickening tanks reveals a dose of 21 mg of hydrogen sulfide per liter for a flow rate of 540 m3 / day.
Au démarrage du procédé, on injecte dans la canalisation d'alimentation des bassins d'épaississement, pendant 24 heures, 0,190 g d'une solution aqueuse commerciale de glyoxal à 40% en poids, présentant un pH de 2 ± 0,5 par litre d'effluent aqueux, soit 76 mg (1,31 mmole) de glyoxal, soit en 24 heures 41 kg (707 moles) de glyoxal. At the start of the process, 0.190 g of a commercial aqueous solution of glyoxal at 40% by weight, having a pH of 2 ± 0.5 per liter, is injected into the feed pipe for thickening tanks for 24 hours. aqueous effluent, i.e. 76 mg (1.31 mmol) of glyoxal, or in 24 hours 41 kg (707 moles) of glyoxal.
A ce stade, l'analyse de l'air au dessus des bassins d'épaississement révèle un taux de 1 vpm d'hydrogène sulfuré. On poursuit ensuite l'injection, dans la canalisation d'alimentation des bassins d'épaississement, de 0,19 g d'une solution aqueuse commerciale de glyoxal à 40% en poids, présentant un pH de 2 ± 0,5 par litre d'effluent aqueux. At this stage, the analysis of the air above the thickening tanks reveals a rate of 1 vpm of hydrogen sulfide. The injection is then continued, into the supply line of the thickening tanks, of 0.19 g of a commercial aqueous solution of glyoxal at 40% by weight, having a pH of 2 ± 0.5 per liter d 'aqueous effluent.
Après 15 jours de traitement, l'analyse de l'air au dessus des bassins d'épaississement révèle un taux inférieur à 1 vpm d'hydrogène sulfuré. On constate également que dans l'ensemble de la station il n'existe plus d'odeurs nauséabondes. De plus, les boues issues de la station, lors de leur stockage puis de leur épandage ne dégagent plus d'odeurs nauséabondes. Par ailleurs, le fonctionnement de la station n'est pas perturbé par la prolifération de bactéries filamenteuses du genre Thiotrix. After 15 days of treatment, the analysis of the air above the thickening tanks reveals a rate of less than 1 vpm of hydrogen sulfide. We also note that throughout the station there are no more foul smells. In addition, the sludge from the station, during storage and then spreading no longer gives off foul odors. Furthermore, the functioning of the station is not disturbed by the proliferation of filamentous bacteria of the genus Thiotrix.
Ce résultat est atteint, en marche continue, par une consommation journalière de 29,5 mmoles (environ 1,71 g) de glyoxal par m3 d'eau usée arrivant à la station d'épuration, soit une consommation This result is achieved, in continuous operation, by a daily consumption of 29.5 mmol (approximately 1.71 g) of glyoxal per m3 of waste water arriving at the treatment plant, i.e. consumption
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CH 687 704 A5 CH 687 704 A5
journalière d'environ 102,6 kg d'une solution aqueuse commerciale de glyoxal à 40% en poids, présentant un pH de 2 ± 0,5 pour le traitement de 24 000 m3 d'eaux usées. daily of approximately 102.6 kg of a commercial aqueous solution of glyoxal at 40% by weight, having a pH of 2 ± 0.5 for the treatment of 24,000 m3 of wastewater.
Claims (3)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9306663A FR2705957B1 (en) | 1993-06-03 | 1993-06-03 | Process for treating wastewater in a wastewater treatment plant with a view to eliminating odor nuisances. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH687704A5 true CH687704A5 (en) | 1997-01-31 |
Family
ID=9447729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH01667/94A CH687704A5 (en) | 1993-06-03 | 1994-05-30 | Process for treating wastewater in a treatment plant with a view to eliminating odor nuisances. |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE1007195A3 (en) |
| CH (1) | CH687704A5 (en) |
| ES (1) | ES2066740B1 (en) |
| FR (1) | FR2705957B1 (en) |
| GB (1) | GB2279070B (en) |
| IT (1) | IT1265966B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7255796B2 (en) | 2004-07-08 | 2007-08-14 | General Electric Company | Method of preventing hydrogen sulfide odor generation in an aqueous medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5343575B2 (en) * | 1972-03-30 | 1978-11-21 | ||
| JPS6284767A (en) * | 1985-10-11 | 1987-04-18 | キャピタル株式会社 | Deodorizing liquid |
| US4680127A (en) * | 1985-12-13 | 1987-07-14 | Betz Laboratories, Inc. | Method of scavenging hydrogen sulfide |
| JPH02139083A (en) * | 1988-11-18 | 1990-05-29 | Daicel Chem Ind Ltd | Process for deodorizing water |
| DE4002132A1 (en) * | 1990-01-25 | 1991-08-01 | Hoechst Ag | METHOD FOR trapping SULFUR HYDROGEN WITH GLYOXAL |
-
1993
- 1993-06-03 FR FR9306663A patent/FR2705957B1/en not_active Expired - Fee Related
-
1994
- 1994-05-20 IT IT94TO000409A patent/IT1265966B1/en active IP Right Grant
- 1994-05-24 ES ES09401136A patent/ES2066740B1/en not_active Expired - Fee Related
- 1994-05-30 CH CH01667/94A patent/CH687704A5/en not_active IP Right Cessation
- 1994-06-02 GB GB9411002A patent/GB2279070B/en not_active Expired - Fee Related
- 1994-06-02 BE BE9400554A patent/BE1007195A3/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| BE1007195A3 (en) | 1995-04-18 |
| FR2705957A1 (en) | 1994-12-09 |
| GB9411002D0 (en) | 1994-07-20 |
| GB2279070A (en) | 1994-12-21 |
| FR2705957B1 (en) | 1995-08-25 |
| ITTO940409A0 (en) | 1994-05-20 |
| ES2066740A1 (en) | 1995-03-01 |
| ES2066740B1 (en) | 1995-11-01 |
| IT1265966B1 (en) | 1996-12-16 |
| GB2279070B (en) | 1996-09-25 |
| ITTO940409A1 (en) | 1995-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PL | Patent ceased |