FR2536674A1 - METHOD AND INSTALLATION FOR RECOVERING SODIUM SULFIDE SOLUTIONS IN REJECTED TANNERIE WATERS - Google Patents
METHOD AND INSTALLATION FOR RECOVERING SODIUM SULFIDE SOLUTIONS IN REJECTED TANNERIE WATERS Download PDFInfo
- Publication number
- FR2536674A1 FR2536674A1 FR8318653A FR8318653A FR2536674A1 FR 2536674 A1 FR2536674 A1 FR 2536674A1 FR 8318653 A FR8318653 A FR 8318653A FR 8318653 A FR8318653 A FR 8318653A FR 2536674 A1 FR2536674 A1 FR 2536674A1
- Authority
- FR
- France
- Prior art keywords
- process according
- layer
- waters
- fossil
- solutions
- 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- Withdrawn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 23
- 239000003643 water by type Substances 0.000 title claims description 6
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 title abstract description 10
- 238000009434 installation Methods 0.000 title description 6
- 229910052979 sodium sulfide Inorganic materials 0.000 title description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 230000035699 permeability Effects 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 235000012054 meals Nutrition 0.000 claims description 5
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- 239000002131 composite material Substances 0.000 claims 1
- 229910052708 sodium Inorganic materials 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 4
- 235000013312 flour Nutrition 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 25
- 239000000126 substance Substances 0.000 description 11
- 239000004094 surface-active agent Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 210000003608 fece Anatomy 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000010871 livestock manure Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012045 crude solution Substances 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Fertilizers (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
- Filtration Of Liquid (AREA)
- Water Treatment By Sorption (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
Abstract
METHODE POUR LA RECUPERATION DES SOLUTIONS DE SULFURE DE SODIUM DANS LES EAUX REJETEES DE TANNERIE, CONSISTANT A FILTRER LES EAUX AVEC UN FILTRE CONSTITUE PAR DES FARINES FOSSILES AYANT UNE PERMEABILITE A L'EAU COMPRISE ENTRE 1 ET 3,5 DARCIES. LA COUCHE FILTRANTE DE FARINES FOSSILES SE DISPOSE SUR LA SURFACE EXTERIEURE D'UN TAMBOUR TOURNANT, IMMERGE DANS LA SOLUTION A EPURER ET DANS LA PARTIE INTERIEURE DUQUEL SE PRATIQUE LE VIDE.METHOD FOR THE RECOVERY OF SODIUM SULPHIDE SOLUTIONS IN WATER DISCHARGED FROM TANNERY, CONSISTING OF FILTERING THE WATER WITH A FILTER CONSTITUTED BY FOSSIL FLOURS HAVING A PERMEABILITY TO WATER BETWEEN 1 AND 3.5 DARCIA. THE FILTERING LAYER OF FOSSIL FLOURS IS ARRANGED ON THE OUTSIDE SURFACE OF A ROTATING DRUM, IMMERSE IN THE SOLUTION TO BE STRIPPED AND IN THE INTERNAL PART WHICH IS PRACTICED THE VACUUM.
Description
1 -1 -
PROCEDE ET INSTALLATION DE RECUPERATION DES SOLUTIONS DE METHOD AND INSTALLATION FOR RECOVERING SOLUTIONS FROM
SULFURE DE SODIUM DANS LES EAUX REJETEES DE TANNERIE; SODIUM SULFIDE IN REJECTED TANNERIE WATERS;
La présente invention se rapporte à un procédé pour récupé- The present invention relates to a method for recovering
rer les solutions de sulfure de sodium dans les eaux rejetées de tannerie et à une installation de mise en oeuvre the solutions of sodium sulphide in tannery wastewater and an installation for
de ce procédé de façon continue et automatique. of this process continuously and automatically.
Dans le cycle de'tannage des peaux, l'une des opérations fondamentales est celle qui se déroule dans ce qu'on appelle le 'plain' et qui a pour but d'éliminer le poil et de faire In the skin tanning cycle, one of the fundamental operations is that which takes place in what is called the 'plain' and which aims to eliminate the hair and make
regonfler la peau, afin de la préparer ainsi pour les opéra- to reinflate the skin so that it can be prepared for
tions successives.successive statements.
Pendant cette opération, les peaux, encore munies du poil, sont introduites, en fût ou en caret, dans de l'eau de chaux contenant du sulfure de sodium et des additifs constitués During this operation, the skins, still provided with the hair, are introduced, in casks or carets, in water of lime containing sodium sulphide and additives constituted
essentiellement par des agents tensio-actifs. essentially by surfactants.
Avec ce traitement, la racine du poil est regonflée et partiellement expulsée du bulbe pileux La solution est déchargée après le traitement Cette solution, outre qu'elle a un p H trop élevé (environ 12) et un contenu de substances organiques dispersées ou dissoutes considérable (demande bio-chimique en oxygène extrêmement élevée), représente un sousproduit encombrant, y compris pour les préposés aux travaux et impossible à décharger dans un quelconque cours With this treatment, the hair root is re-inflated and partially expelled from the hair bulb The solution is discharged after the treatment This solution, besides it has too high a pH (about 12) and a content of organic substances dispersed or dissolved considerable (Extremely high biochemical oxygen demand), is a bulky byproduct, including for work attendants and impossible to unload in any course
d'eau ou collecteur d'eaux urbaines. water or urban water collector.
L'épuration de ces solutions avant leur décharge est donc -2- The purification of these solutions before their discharge is therefore -2-
indispensable, permettant ainsi de récupérer aussi la solu- essential, thus enabling the recovery of
tion contenant du sulfure de sodium. containing sodium sulphide.
Divers procédés ont été proposés pour l'épuration de ces eaux rejetées, mais aucun d'eux n'est sans inconvénients. Ainsi, par exemple, on connaît le procédé de la décantation qui consiste à faire décanter la partie lourde et affleurer la partie plus légère de la solution Avec ce-procédé, toutefois, la solution ne réussit pas à se libérer d'une Various processes have been proposed for the purification of these discharged waters, but none of them is without drawbacks. Thus, for example, the decantation process is known which consists in decanting the heavy part and flush with the lighter part of the solution. With this method, however, the solution does not succeed in being released from a solution.
quantité considérable de substances organiques émulsion- considerable amount of organic emulsifying substances
nées, si bien que la solution décantée ne devient pas tout à fait limpide et conserve toujours un pourcentage élevé de the decanted solution does not become completely clear and still retains a high percentage of
substances organiques (valeur élevée de la demande bio- organic substances (high value of organic demand
chimique en oxygène).chemical oxygen).
Cet inconvénient s'aggrave de cycle en cycle, si bien qu'en général, au troisième cycle, la solution doit être déchargée parce qu'elle commence à entraver le déroulement régulier This disadvantage worsens from cycle to cycle, so that in general, in the third cycle, the solution must be unloaded because it begins to hinder the smooth running
des opérations qui s'effectuent dans le plain. operations that take place in the plain.
On connaît aussi le procédé d'osmose inverse, au moyen duquel le sulfure de sodium et l'hydroxyde de calcium sont soustraits des solutions et passent de la solution à l'eau épurante, tandis que sont séparées la solution colloïdale et Also known is the reverse osmosis process, by means of which sodium sulphide and calcium hydroxide are removed from the solutions and passed from the solution to the purifying water, while the colloidal solution is separated and
les parties grossières dispersées Ce procédé permet d'obte- the coarse dispersed parts This process makes it possible to obtain
nir d'excellentes solutions de sulfure de sodium, mais l'installation est de réalisation coûteuse, tant pour son agencement que pour son fonctionnement En outre, il faut une régénération périodique des membranes et il reste toujours le problème d'écouler le volume de purin riche en Although the installation is expensive, both for its layout and for its operation. In addition, periodic membrane regeneration is required and there is always the problem of disposing of the volume of liquid manure. rich in
substances organiques et putrescibles, résultant du contre- organic and putrescible substances, resulting from
lavage.washing.
L'invention propose un procédé pour la récupération des solutions de sulfure de sodium dans les eaux rejetées de tannerie, qui ne présente pas les inconvénients mentionnés The invention proposes a process for the recovery of sodium sulphide solutions in tannery waste waters, which does not have the drawbacks mentioned.
ci-dessus.above.
Ce procédé permet d'obtenir, avec une bonne économie de gestion et d'installation, la ré-utilisation à peu près intégrale de la solution de sulfure de sodium et d'agents tensio-actifs et une récupération utile et économique des -3- This process makes it possible to obtain, with a good economy of management and installation, the almost complete re-use of the solution of sodium sulphide and surfactants and a useful and economic recovery of the -3-
substances organiques.organic substances.
Selon la présente invention, le procédé consiste à filtrer les eaux rejetées de tannerie provenant du traitement au plain et contenant essentiellement du sulfure de sodium, de According to the present invention, the method consists in filtering the tannery waste water from the plain treatment and essentially containing sodium sulphide,
l'hydroxyde de calcium et des substances organiques disper- calcium hydroxide and organic substances
sées ou dissoutes, en employant comme filtre une couche de farines fossiles composées ayant une perméabilité à l'eau dissolved or dissolved, using as a filter a layer of compound fossil meal with a water permeability
comprise entre 1 et 3,5 Darcies.between 1 and 3.5 Darcies.
Avec ce procédé de filtration, les eaux rejetées sont complètement et aisément épurées grâce à l'action mécanique With this filtration process, the discharged water is completely and easily purified thanks to the mechanical action
de filtre et d'absorption exercée par les surfaces micropo- of filter and absorption exerted by the microporous surfaces
reuses de la farine fossile La méthode de la présente invention est rationnellement industrialisée en appliquant The method of the present invention is rationally industrialized by applying
la couche continue de farine fossile sur la surface exté- the continuous layer of fossil flour on the outer surface
rieure d'un tambour tournant immergé dans la solution àa épurer et opérant sous vide, de préférence dans l'intervalle of a rotating drum immersed in the solution to be purified and operating under vacuum, preferably in the interval
compris entre 33 325 et 73 315 Pa.between 33,325 and 73,315 Pa.
La couche filtrante de farine fossile se renouvelle périodi- The filter layer of fossil flour is renewed periodically
quement en faisant déposer sur celle-ci des solutions denses by depositing dense solutions on it
de farine fossile.of fossil flour.
Pendant le filtrage, la dépression exercée sur la solution à épurer tend à faire dégager des vapeurs d'hydrogène sulfuré et les gaz dissous dans la solution La solution à épurer étant riche en substances tensio-actives, le dégagement de ces vapeurs et gaz tendrait à créer de l'écume Pour éviter que ces bulles ne soient entraînées vers la pompe à vide, selon la présente invention, les solutions brutes à épurer et les solutions filtrantes sont traitées avec des agents anti-écume et de toute façon retenues par une couche de During the filtration, the depression exerted on the solution to be purified tends to release vapors of hydrogen sulphide and the gases dissolved in the solution The solution to be purified being rich in surfactants substances, the release of these vapors and gases would tend to To prevent these bubbles from being entrained towards the vacuum pump, according to the present invention, the crude solutions to be purified and the filtering solutions are treated with anti-foaming agents and in any case retained by a layer of foam.
bagues rasching.rasching rings.
Pour mieux comprendre la présente invention, celle-ci sera maintenant décrite en se référant à la figure ci-jointe qui représente une illustration schématique d'une réalisation particulière de la présente invention, donnée dans le seul To better understand the present invention, it will now be described with reference to the attached figure which is a schematic illustration of a particular embodiment of the present invention given in the sole
but d'illustration et d'exemple, mais non limitative. purpose of illustration and example, but not limiting.
Chaque élément de l'installation illustrée dans la figure Each element of the installation illustrated in the figure
2536674-2536674-
n'est pas décrit en détail, car ces éléments sont bien is not described in detail because these elements are well
connus-des techniciens dans ce domaine. known technicians in this field.
Avec référence à la figure, la solution à épurer provenant du procédé de plain et contenant essentiellement du sulfure With reference to the figure, the solution to be purified from the plain process and containing essentially sulfide
de sodium, de l'hydroxyde de calcium et des substances orga- sodium hydroxide, calcium hydroxide and organic substances
niques dispersées ou dissoutes, est envoyée à un bac de scattered or dissolved, is sent to a
stockage 1 et transférée, par l'intermédiaire de l'électro- storage 1 and transferred via the electro-
pompe 2, à un organe d'alimentation 3 dans le but de dimi- pump 2, to a feed member 3 for the purpose of
nuer la turbulence du flux et de favoriser le phénomène de the turbulence of the flow and to promote the phenomenon of
coalescence des substances grasses en suspension. coalescence of fatty substances in suspension.
Par chute, le purin transborde dans un bac o est immergé un tambour tournant 4 Sur la surface extérieure du tambour 4 By falling, the manure transshoes in a tray where is immersed a rotating drum 4 On the outer surface of the drum 4
est placée une couche de farine fossile 4 b ayant une perméa- is placed a layer of fossil flour 4b having permeation
bilité à l'eau de 1 à 3,5 Darcies Par l'intermédiaire d'une pompe à vide 9 qui puise à l'intérieur du tambour 4, la solution traverse la couche 4 b et est entraînée dans le réservoir 6, d'o, par l'intermédiaire de l'électro-pompe auto-amorçante 7, elle est envoyée au stockage pour sa mise 1 to 3.5 Darcies With the aid of a vacuum pump 9 which draws inside the drum 4, the solution passes through the layer 4b and is entrained in the reservoir 6, o, via the self-priming electro-pump 7, it is sent to storage for its implementation
en titre et sa ré-utilisation en tannerie. in title and its re-use in tannery.
Les vapeurs et/ou l'écume, qui se dégagent dans la partie haute du réservoir 6, sont retenues par un sas mécanique à plusieurs couches 8 pour empêcher le mélange des vapeurs d'hydrogène sulfuré et/ou tensio- actives dans la pompe à The vapors and / or the scum, which are released in the upper part of the tank 6, are retained by a multi-layer mechanical lock 8 to prevent the mixing of the hydrogen sulfide and / or surfactant vapors in the pump.
vide 9.empty 9.
Les parties organiques en suspension ou ayant une dimension importante, telle qu'elles ne puissent passer à travers la couche de farine fossile 4 b, se déposent à l'extérieur de la couche elle-même et, par une lame mobile 10 à déplacement micrométrique, sont déchargées, avec une légère couche de farine, dans le récipient 5; elles peuvent être utilisées The organic parts in suspension or having a large dimension, such that they can not pass through the layer of fossil flour 4b, are deposited outside the layer itself and, by a movable blade 10 micrometric displacement are discharged, with a light layer of flour, into the container 5; they can be used
ensuite en agriculture comme engrais et matériaux de rem- then in agriculture as fertilizer and fertilizer
blai.blai.
Le procédé décrit présente de nombreux avantages: utilisa- The method described has many advantages:
tion maximum de la solution; suppression des pertes techno- maximum solution; elimination of technological losses
logiques; possibilité de ré-utiliser les substances organiques de décharge mélangées à la farine fossile; - logical; possibility of re-using organic discharge substances mixed with fossil flour; -
automatisation de l'installation avec fonctionnement con- automation of the system with operation
tinu sans intervention pendant des jours; possibilité de ne pas devoir ajouter à la solution des additifs et floculants d'aucune sorte, etc tinu without intervention for days; possibility of not having to add to the solution additives and flocculants of any kind, etc.
Claims (7)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT24494/82A IT1205282B (en) | 1982-11-29 | 1982-11-29 | AUTOMATIC METHOD AND CONTINUOUS PLANT FOR THE RECOVERY OF SULFUR SOLUTIONS FROM TANNING WASTEWATER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2536674A1 true FR2536674A1 (en) | 1984-06-01 |
Family
ID=11213744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8318653A Withdrawn FR2536674A1 (en) | 1982-11-29 | 1983-11-23 | METHOD AND INSTALLATION FOR RECOVERING SODIUM SULFIDE SOLUTIONS IN REJECTED TANNERIE WATERS |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS59146913A (en) |
| AT (1) | AT383576B (en) |
| DE (1) | DE3341273A1 (en) |
| FR (1) | FR2536674A1 (en) |
| GB (1) | GB2131711A (en) |
| IT (1) | IT1205282B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB816368A (en) * | 1957-01-08 | 1959-07-08 | Olin Mathieson | Improvements in methods of and apparatus for filtering |
| GB1082862A (en) * | 1964-07-08 | 1967-09-13 | S J A Ab | A process in filtering yeast or other plant cell material |
| GB1443432A (en) * | 1972-12-21 | 1976-07-21 | Gec Diesels Ltd | Rotary drum filters |
| GB1502128A (en) * | 1975-10-21 | 1978-02-22 | Alar Eng Corp | Rotary vacuum filters |
| JPS5331355A (en) * | 1976-07-16 | 1978-03-24 | Tadashi Niimi | Method and apparatus for treating sewage |
-
1982
- 1982-11-29 IT IT24494/82A patent/IT1205282B/en active
-
1983
- 1983-11-15 AT AT0401283A patent/AT383576B/en not_active IP Right Cessation
- 1983-11-15 DE DE19833341273 patent/DE3341273A1/en not_active Withdrawn
- 1983-11-16 GB GB08330513A patent/GB2131711A/en not_active Withdrawn
- 1983-11-23 FR FR8318653A patent/FR2536674A1/en not_active Withdrawn
- 1983-11-28 JP JP58225344A patent/JPS59146913A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB2131711A (en) | 1984-06-27 |
| IT8224494A0 (en) | 1982-11-29 |
| IT1205282B (en) | 1989-03-15 |
| AT383576B (en) | 1987-07-27 |
| ATA401283A (en) | 1986-12-15 |
| GB8330513D0 (en) | 1983-12-21 |
| JPS59146913A (en) | 1984-08-23 |
| DE3341273A1 (en) | 1984-05-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |