FR2817489A1 - Preparation of a new composition useful for wastewater treatment, comprises mixing an anionic surfactant solution with a water-in-oil emulsion or polyvalent inorganic cation solution and urea - Google Patents
Preparation of a new composition useful for wastewater treatment, comprises mixing an anionic surfactant solution with a water-in-oil emulsion or polyvalent inorganic cation solution and urea Download PDFInfo
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- FR2817489A1 FR2817489A1 FR0016981A FR0016981A FR2817489A1 FR 2817489 A1 FR2817489 A1 FR 2817489A1 FR 0016981 A FR0016981 A FR 0016981A FR 0016981 A FR0016981 A FR 0016981A FR 2817489 A1 FR2817489 A1 FR 2817489A1
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- anionic surfactant
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- 239000000203 mixture Substances 0.000 title claims abstract description 44
- 239000003945 anionic surfactant Substances 0.000 title claims abstract description 23
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000004202 carbamide Substances 0.000 title claims abstract description 18
- 150000001767 cationic compounds Chemical class 0.000 title claims abstract description 7
- 229910001411 inorganic cation Inorganic materials 0.000 title claims abstract description 7
- 238000002156 mixing Methods 0.000 title claims abstract description 6
- 239000007762 w/o emulsion Substances 0.000 title abstract description 3
- 238000004065 wastewater treatment Methods 0.000 title 1
- 239000010802 sludge Substances 0.000 claims description 20
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 17
- 239000011707 mineral Substances 0.000 claims description 17
- 150000001768 cations Chemical class 0.000 claims description 15
- LVTJOONKWUXEFR-FZRMHRINSA-N protoneodioscin Natural products O(C[C@@H](CC[C@]1(O)[C@H](C)[C@@H]2[C@]3(C)[C@H]([C@H]4[C@@H]([C@]5(C)C(=CC4)C[C@@H](O[C@@H]4[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@@H](O)[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@H](CO)O4)CC5)CC3)C[C@@H]2O1)C)[C@H]1[C@H](O)[C@H](O)[C@H](O)[C@@H](CO)O1 LVTJOONKWUXEFR-FZRMHRINSA-N 0.000 claims description 12
- 238000011282 treatment Methods 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 9
- 230000003750 conditioning effect Effects 0.000 claims description 9
- 239000000839 emulsion Substances 0.000 claims description 9
- 229910052783 alkali metal Inorganic materials 0.000 claims description 6
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical class Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 claims description 5
- 150000001340 alkali metals Chemical class 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 3
- 229940043264 dodecyl sulfate Drugs 0.000 claims description 3
- 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 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 150000001242 acetic acid derivatives Chemical class 0.000 claims description 2
- -1 alkali metal succinate Chemical class 0.000 claims description 2
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 2
- 150000008051 alkyl sulfates Chemical class 0.000 claims description 2
- 229940045714 alkyl sulfonate alkylating agent Drugs 0.000 claims description 2
- 150000008052 alkyl sulfonates Chemical class 0.000 claims description 2
- 239000012736 aqueous medium Substances 0.000 claims description 2
- 150000007942 carboxylates Chemical class 0.000 claims description 2
- 150000001805 chlorine compounds Chemical class 0.000 claims description 2
- MOTZDAYCYVMXPC-UHFFFAOYSA-N dodecyl hydrogen sulfate Chemical group CCCCCCCCCCCCOS(O)(=O)=O MOTZDAYCYVMXPC-UHFFFAOYSA-N 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- 150000002823 nitrates Chemical class 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 claims 1
- 150000003672 ureas Chemical class 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000001914 filtration Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 229920000867 polyelectrolyte Polymers 0.000 description 2
- MVXMNHYVCLMLDD-UHFFFAOYSA-N 4-methoxynaphthalene-1-carbaldehyde Chemical compound C1=CC=C2C(OC)=CC=C(C=O)C2=C1 MVXMNHYVCLMLDD-UHFFFAOYSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 239000005997 Calcium carbide Substances 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004166 Lanolin Substances 0.000 description 1
- 150000007945 N-acyl ureas Chemical class 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920006317 cationic polymer Polymers 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 229940039717 lanolin Drugs 0.000 description 1
- 235000019388 lanolin Nutrition 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- GKRZNOGGALENQJ-UHFFFAOYSA-N n-carbamoylacetamide Chemical compound CC(=O)NC(N)=O GKRZNOGGALENQJ-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 235000019271 petrolatum Nutrition 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- MBEGFNBBAVRKLK-UHFFFAOYSA-N sodium;iminomethylideneazanide Chemical compound [Na+].[NH-]C#N MBEGFNBBAVRKLK-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-L succinate(2-) Chemical compound [O-]C(=O)CCC([O-])=O KDYFGRWQOYBRFD-UHFFFAOYSA-L 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 239000001993 wax Substances 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/547—Tensides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
- C09K23/08—Sulfation or sulfonation products of fats, oils, waxes, or higher fatty acids or esters thereof with monovalent alcohols
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
- C09K23/14—Derivatives of phosphoric acid
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
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COMPOSITION CONTENANT DE L'UREE UTILISABLE POUR LE CONDITIONNEMENT DE BOUES
La présente invention concerne une nouvelle composition utilisable notamment pour le traitement des milieux aqueux comme les eaux résiduaires ou urbaines ou industrielles, et plus particulièrement pour le conditionnement de boues préalablement à leur opération de déshydratation. COMPOSITION CONTAINING UREA FOR USE IN THE CONDITIONING OF SLUDGE
The present invention relates to a new composition which can be used in particular for the treatment of aqueous media such as waste water or urban or industrial water, and more particularly for the conditioning of sludges prior to their dewatering operation.
Le traitement des eaux résiduaires, urbaines ou industrielles, en particulier par voie biologique, dans les stations d'épuration, conduit notamment à la production de boues. Ces boues subissent habituellement une opération de déshydratation mécanique (en particulier filtration, centrifugation), avant d'être transportées vers un site de décharge, d'épandage agricole ou d'incinération. The treatment of waste water, urban or industrial, in particular by biological means, in treatment plants, leads in particular to the production of sludge. This sludge usually undergoes a mechanical dewatering operation (in particular filtration, centrifugation), before being transported to a landfill, agricultural spreading or incineration site.
En général, les boues à traiter sont constituées majoritairement d'eau dans laquelle est dispersée de la biomasse, par exemple à raison de 12 à 40 g/I. In general, the sludge to be treated consists mainly of water in which biomass is dispersed, for example at a rate of 12 to 40 g / l.
Les traitements visent donc à concentrer au maximum la matière sèche et à éliminer l'eau. The treatments therefore aim to concentrate the dry matter as much as possible and to remove the water.
La présente invention a précisément pour objet de proposer une nouvelle composition utilisable efficacement dans le conditionnement de boues, permettant notamment d'augmenter leur siccité, c'est-à-dire d'accroître les extraits secs obtenus lors de l'opération subséquente de déshydratation. The object of the present invention is precisely to propose a new composition which can be used effectively in the conditioning of sludge, making it possible in particular to increase their dryness, that is to say to increase the dry extracts obtained during the subsequent dewatering operation. .
Lorsque les boues sont destinées à un filtre presse, on ajoute classiquement aux boues à traiter un sel inorganique associé le cas échéant à un électrolyte, couramment la chaux. When the sludge is intended for a filter press, conventionally added to the sludge to be treated is an inorganic salt associated, where appropriate, with an electrolyte, commonly lime.
En revanche, lorsque les boues sont destinées à être traitées sur filtre à bande ou par centrifugeuse, la drainabilité nécessaire à l'évacuation de l'eau est obtenue généralement en leur ajoutant de manière séquencée un sel inorganique, un polymère cationique puis éventuellement un polymère anionique. On the other hand, when the sludge is intended to be treated on a band filter or by centrifuge, the drainability necessary for the evacuation of the water is generally obtained by adding thereto in sequence a inorganic salt, a cationic polymer and then optionally a polymer anionic.
Les méthodes de traitement des boues actuellement disponibles sont donc distinctes selon la technique de séparation eau/biomasse retenue. D'autre part, elles nécessitent généralement l'ajout successif de plusieurs réactifs. Il The sludge treatment methods currently available are therefore different depending on the water / biomass separation technique used. On the other hand, they generally require the successive addition of several reagents. he
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s'avère en effet difficile de formuler dans une unique composition et à des concentrations significatives, un sel organique de type polychlorure d'aluminium et un polyélectrolyte cationique. L'aluminium étant un complexant de certains polyélectrolytes, leurs mélanges mènent à partir d'une certaine concentration en ces composés, à la formation de gels qui sont bien entendu préjudiciables en terme de fluidité aux mélanges correspondants
La présente invention a précisément pour objet de proposer une composition universelle, c'est à dire pouvant être utilisée de manière indifférente pour le traitement des boues selon l'une ou l'autre des techniques évoquées cidessus. indeed proves difficult to formulate in a single composition and at significant concentrations, an organic salt of aluminum polychloride type and a cationic polyelectrolyte. Aluminum being a complexing agent of certain polyelectrolytes, their mixtures lead from a certain concentration of these compounds, to the formation of gels which are of course detrimental in terms of fluidity to the corresponding mixtures
The present invention specifically aims to provide a universal composition, that is to say that can be used interchangeably for the treatment of sludge according to one or the other of the techniques mentioned above.
Par ailleurs, la composition selon l'invention présente l'avantage de réunir sous forme d'un mélange, un cation minéral de charge supérieure ou égale à 2, un tensio-actif anionique et de l'urée ou un composé dérivé de l'urée, tout en n'étant pas sujette au phénomène de gélification discuté précédemment. Furthermore, the composition according to the invention has the advantage of combining, in the form of a mixture, an inorganic cation of charge greater than or equal to 2, an anionic surfactant and urea or a compound derived from the urea, while not subject to the gelling phenomenon discussed above.
Plus précisément, la présente invention a pour objet principal une composition utilisable pour le conditionnement des boues susceptible d'être obtenue par mélange d'au moins une solution A d'au moins un tensio-actif anionique avec, d'une part, au moins une émulsion inverse (eau dans huile) ou une solution B contenant au moins un cation minéral de charge supérieure ou égale à deux et, d'autre part, au moins un composé C choisi parmi l'urée et les composés dérivés de l'urée. More specifically, the main object of the present invention is a composition which can be used for the conditioning of sludge which can be obtained by mixing at least one solution A of at least one anionic surfactant with, on the one hand, at least a reverse emulsion (water in oil) or a solution B containing at least one mineral cation with a charge greater than or equal to two and, on the other hand, at least one compound C chosen from urea and compounds derived from urea .
Elle s'étend à une composition utilisable pour le conditionnement de boues, caractérisée en ce qu'elle se présente sous la forme d'une émulsion comprenant en phase (s) aqueuse (s) et de manière séparée au moins un tensioactif anionique, au moins un cation minéral de charge supérieure ou égale à 2 et au moins un composé C choisi parmi l'urée et les composés dérivés de l'urée. It extends to a composition which can be used for conditioning sludge, characterized in that it is in the form of an emulsion comprising in aqueous phase (s) and separately at least one anionic surfactant, at minus one mineral cation with a charge greater than or equal to 2 and at least one compound C chosen from urea and compounds derived from urea.
La composition selon l'invention peut se présenter sous la forme d'une solution, en particulier homogène. The composition according to the invention can be in the form of a solution, in particular homogeneous.
Elle peut également se présenter sous la forme d'une émulsion, notamment d'une émulsion inverse eau dans huile ou d'une émulsion double eau/huile/eau, dans laquelle le cation minéral est isolé du composé C. It can also be in the form of an emulsion, in particular a reverse water-in-oil emulsion or a double water / oil / water emulsion, in which the mineral cation is isolated from compound C.
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Les compositions selon l'invention sont particulièrement avantageuses dans la mesure où elles s'avèrent efficaces pour l'ensemble des techniques de traitement des boues à savoir filtration à bande et/ou centrifugation ou filtration sur presse. The compositions according to the invention are particularly advantageous insofar as they prove to be effective for all of the sludge treatment techniques, namely belt filtration and / or centrifugation or filtration on a press.
Le composé C est choisi parmi l'urée ou les composés dérivés de l'urée.
L'urée (ou diamide carbonique) peut notamment être obtenue de trois façons : - par l'action du chlorure d'acide coorespondant sur l'ammoniac, - par l'intermédiaire du cyanamide calcique CaCN2, à partir du carbure de calcium, - par une réaction entre l'ammoniac et l'anhydride carbonique. Compound C is chosen from urea or compounds derived from urea.
Urea (or carbon dioxide) can in particular be obtained in three ways: - by the action of the chloride of cooresponding acid on ammonia, - by means of calcium cyanamide CaCN2, starting from calcium carbide, - by a reaction between ammonia and carbon dioxide.
Les composés dérivés de l'urée sont notamment les uréides, c'est-à-dire les composés dérivés de l'urée par substitution de radicaux acidyles à l'hydrogène des groupements NH2, comme par exemple l'acétylurée ou la diacétylurée. The compounds derived from urea are in particular ureides, that is to say the compounds derived from urea by substitution of acidyl radicals for the hydrogen of the NH 2 groups, such as for example acetylurea or diacetylurea.
Le composé C est mis en oeuvre sous la forme d'une solution aqueuse ou d'une émulsion inverse eau dans huile. Compound C is used in the form of an aqueous solution or a water-in-oil reverse emulsion.
De manière très préférée, le composé C est l'urée. Very preferably, compound C is urea.
Tout tensio-actif anionique comporte une partie non-ionique et une partie polaire ionique. Any anionic surfactant has a nonionic part and an ionic polar part.
En général, dans le cadre de l'invention, le tensio-actif anionique de la solution A est tel que sa partie non-ionique (qui est généralement constituée d'une chaîne hydrocarbonée à caractère hydrophobe et, éventuellement, d'une chaîne polyalcoxylée à caractère hydrophile, notamment polyéthoxylée) présente une valeur HLB ("Balance Hydrophilie/Lipophilie") d'au plus 10. In general, in the context of the invention, the anionic surfactant of solution A is such that its nonionic part (which generally consists of a hydrocarbon chain of hydrophobic character and, optionally, of a polyalkoxylated chain hydrophilic, in particular polyethoxylated) has an HLB ("Hydrophilic / Lipophilic Balance") value of at most 10.
Cette partie non-ionique (qui correspond au tensio-actif non-ionique à partir duquel peut être préparé ledit tensio-actif anionique) peut présenter en particulier une valeur HLB d'au plus 8, par exemple d'au plus 4. This nonionic part (which corresponds to the nonionic surfactant from which said anionic surfactant can be prepared) may in particular have an HLB value of at most 8, for example at most 4.
La partie polaire ionique du tensio-actif anionique de la solution A est habituellement un phosphate, un phosphonate, un carboxylate, un sulfonate, un sulfate ou un succinate de métal alcalin ou alcalino-terreux. The ionic polar part of the anionic surfactant of solution A is usually a phosphate, phosphonate, carboxylate, sulfonate, sulfate or succinate of an alkali or alkaline earth metal.
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On peut notamment employer un tensio-actif anionique choisi parmi les alkylphosphates, les alkylarylphosphates, les étherphosphates, les alkylsulfonates, les alkylbenzènesulfonates, les alkylsulfates, les alkylarylsulfates, les alkyléthersulfates, les alkylaryléthersulfates ou les dialkylsulfosuccinates de métal alcalin, polyalcoxylés (notamment polyéthoxylés) ou non, dont la partie non-ionique présente, de préférence, une valeur HLB d'au plus 10, en particulier d'au plus 8, par exemple d'au plus 4. It is possible in particular to use an anionic surfactant chosen from alkylphosphates, alkylarylphosphates, etherphosphates, alkylsulfonates, alkylbenzenesulfonates, alkylsulfates, alkylarylsulfates, alkylethersulfates, alkylarylethersulfates or dialkylsulfosuccinates of alkali metal or polyalkyloxyethoxyl) no, the nonionic part of which preferably has an HLB value of at most 10, in particular at most 8, for example at most 4.
De manière avantageuse, ledit tensio-actif anionique est un dodécyl sulfate de métal alcalin, de préférence de sodium. Advantageously, said anionic surfactant is an alkali metal, preferably sodium, dodecyl sulfate.
La solution A présente généralement une teneur en tensio-actif anionique supérieure à sa concentration micellaire critique : elle contient ainsi en général le tensio-actif sous forme de micelles. Solution A generally has an anionic surfactant content greater than its critical micellar concentration: it therefore generally contains the surfactant in the form of micelles.
Le cation minéral présente une charge supérieure ou égale à 2. Il est habituellement choisi parmi Mg2+, AI3+, Fe, La3+, Zr4+ et leurs formes polymérisées lorsqu'elles existent. De manière très préférée, le cation minéral est A13+ ou une de ses formes polymérisées. The mineral cation has a charge greater than or equal to 2. It is usually chosen from Mg2 +, AI3 +, Fe, La3 +, Zr4 + and their polymerized forms when they exist. Very preferably, the mineral cation is A13 + or one of its polymerized forms.
Ce cation minéral se présente généralement sous la forme d'un sel hydrosoluble. A titre de sels hydrosolubles, on peut utiliser les chlorures, les nitrates, les sulfates et les acétates
On utilise le plus souvent un sel hydrosoluble soluble exempt de l'élément azote, ce qui permet de s'affranchir des problèmes éventuels liés à sa présence. This mineral cation is generally in the form of a water-soluble salt. As water-soluble salts, chlorides, nitrates, sulfates and acetates can be used
Most often a water-soluble soluble salt free of the nitrogen element is used, which makes it possible to overcome any problems linked to its presence.
De manière très préférée, on emploie un chlorure. Le cation minéral se présente alors en général sous la forme d'un chlorure ferrique ou, de préférence, d'un chlorure d'aluminium ou une de ses formes polymérisées et plus préférentiellement du polychlorure d'aluminium. Very preferably, a chloride is used. The mineral cation is then generally in the form of a ferric chloride or, preferably, of an aluminum chloride or one of its polymerized forms and more preferably of polychloride of aluminum.
De manière avantageuse, le rapport molaire (cation minéral de charge supérieure ou égale à 2) / (tensio-actif anionique) est supérieur au rapport (charge du tensio-actif anionique)/ (charge dudit cation minéral). Advantageously, the molar ratio (inorganic cation of charge greater than or equal to 2) / (anionic surfactant) is greater than the ratio (charge of anionic surfactant) / (charge of said mineral cation).
Le rapport molaire (cation minéral de charge supérieure ou égale à 2)/ (tensio-actif anionique), notamment dans le cas où on met en oeuvre du dodécyl sulfate de métal alcalin et du chlorure d'aluminium, est de préférence compris entre 1 et 20, en particulier entre 1,5 et 10, par exemple entre 2 et 5. The molar ratio (inorganic cation of charge greater than or equal to 2) / (anionic surfactant), in particular in the case where alkali metal dodecyl sulfate and aluminum chloride are used, is preferably between 1 and 20, in particular between 1.5 and 10, for example between 2 and 5.
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Le tensio-actif anionique peut être mis en oeuvre à raison d'au plus 0, 6 mole, en particulier d'au plus 0, 4 mole, notamment de 0, 15 à 0, 35 mole, par kg de composition (ou de mélange réactionnel A + B + C). The anionic surfactant can be used in a proportion of at most 0.6 mole, in particular at most 0.4 mole, in particular from 0.15 to 0.35 mole, per kg of composition (or reaction mixture A + B + C).
La quantité de cation minéral mise en oeuvre est de préférence comprise entre 0,04 et 2 moles, en particulier entre 0,25 et 1,8 moles, par exemple entre 0,49 et 1,5 moles, par kg de composition. The amount of mineral cation used is preferably between 0.04 and 2 moles, in particular between 0.25 and 1.8 moles, for example between 0.49 and 1.5 moles, per kg of composition.
Le pH de la solution ou émulsion B est ajusté de manière à prévenir la précipitation du sel minéral dans la phase aqueuse continue. The pH of solution or emulsion B is adjusted so as to prevent precipitation of the mineral salt in the continuous aqueous phase.
Le composé C est en général mis en oeuvre à raison d'au plus 15 %, de préférence d'au plus 10 %, par exemple de 0,3 à 7 %, en poids de la composition. Compound C is generally used in an amount of at most 15%, preferably at most 10%, for example from 0.3 to 7%, by weight of the composition.
Le rapport molaire (cation minéral de charge supérieure ou égale à 2)/ (composé C) est par exemple compris entre 1. 101 et 8. 106, en particulier entre 1. 102 et 8. 106. The molar ratio (inorganic cation with a charge greater than or equal to 2) / (compound C) is for example between 1.101 and 8.106, in particular between 1.102 and 8.106.
La composition selon l'invention peut être préparée par mélange de la solution (aqueuse) A, de l'émulsion ou de la solution (aqueuse) B et du composé C pouvant se présenter sous forme d'une solution aqueuse ou d'une émulsion inverse ; le mélange est effectué généralement à température ambiante et sous une agitation mécanique suffisante pour conduire à une composition stabilisée dans le temps. The composition according to the invention can be prepared by mixing the (aqueous) solution A, the emulsion or the (aqueous) solution B and the compound C which can be in the form of an aqueous solution or an emulsion reverse; the mixing is generally carried out at room temperature and with sufficient mechanical stirring to lead to a composition stabilized over time.
A titre Illustratif des composés susceptibles d'être utilisés à titre de phase huileuse, on peut citer des matériaux hydrophobes comme notamment les esters de colophane, la lanoline, la vaseline, les cires, les polybutadiènes de faibles masses moléculaires, les huiles naturelles animales, végétales ou minérales et leurs mélanges. By way of illustration of the compounds capable of being used as oily phase, mention may be made of hydrophobic materials such as in particular rosin esters, lanolin, petroleum jelly, waxes, low molecular weight polybutadienes, natural animal oils, vegetable or mineral and their mixtures.
La composition selon l'invention trouve une application particulièrement intéressante dans le conditionnement chimique des boues, notamment de boues issues des stations d'épuration des eaux usées ou résiduaires, urbaines ou industrielles : son incorporation dans les boues, que l'on peut soumettre préalablement à un traitement de digestion anaérobie, permet de les structurer de telle manière que l'eau contenue dans ces boues est mieux exsudée lors de l'opération de déshydratation qui suit. L'efficacité de l'opération de The composition according to the invention finds a particularly advantageous application in the chemical conditioning of sludge, in particular of sludge from sewage treatment plants or wastewater, urban or industrial: its incorporation in sludge, which can be submitted beforehand to an anaerobic digestion treatment, allows them to be structured in such a way that the water contained in these sludges is better exuded during the following dehydration operation. The efficiency of the operation of
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déshydratation mécanique comme la filtration ou la centrifugation peut ainsi être améliorée, les volumes produits après cette déshydratation étant réduits par l'obtention d'un gâteau de filtration de siccité élevée. mechanical dehydration such as filtration or centrifugation can thus be improved, the volumes produced after this dehydration being reduced by obtaining a filtration cake of high dryness.
La quantité de cette composition utilisée lors du conditionnement d'une boue est telle qu'elle correspond en général entre 0,05 à 3 fois, de préférence entre 0,1 à 2,5 fois, la quantité de charge cationique théorique nécessaire pour neutraliser la quantité de charge anionique de la boue à traiter ; en d'autres termes, la quantité de composition employée est telle qu'elle présente en valeur absolue une cationicité égale en général à 0,05 à 3 fois, de préférence égale à 0,1 à 2,5 fois, l'anionicité de la boue à traiter. La composition peut être diluée avant utilisation. The amount of this composition used during the conditioning of a sludge is such that it generally corresponds between 0.05 to 3 times, preferably between 0.1 to 2.5 times, the amount of theoretical cationic charge necessary to neutralize the amount of anionic charge of the sludge to be treated; in other words, the quantity of composition used is such that it has, in absolute value, a cationicity generally equal to 0.05 to 3 times, preferably equal to 0.1 to 2.5 times, the anionicity of the sludge to be treated. The composition can be diluted before use.
Claims (17)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0016981A FR2817489A1 (en) | 2000-12-01 | 2000-12-01 | Preparation of a new composition useful for wastewater treatment, comprises mixing an anionic surfactant solution with a water-in-oil emulsion or polyvalent inorganic cation solution and urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0016981A FR2817489A1 (en) | 2000-12-01 | 2000-12-01 | Preparation of a new composition useful for wastewater treatment, comprises mixing an anionic surfactant solution with a water-in-oil emulsion or polyvalent inorganic cation solution and urea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2817489A1 true FR2817489A1 (en) | 2002-06-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0016981A Pending FR2817489A1 (en) | 2000-12-01 | 2000-12-01 | Preparation of a new composition useful for wastewater treatment, comprises mixing an anionic surfactant solution with a water-in-oil emulsion or polyvalent inorganic cation solution and urea |
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| Country | Link |
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| FR (1) | FR2817489A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9161883B1 (en) * | 2011-01-10 | 2015-10-20 | R. Jeffrey Busbey | Adjustable return fitting |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447344A (en) * | 1983-06-02 | 1984-05-08 | Nalco Chemical Company | Dewatering aids for coal and other mineral particulates |
| JPH01307492A (en) * | 1988-06-07 | 1989-12-12 | Iseki Tory Tech Inc | Treatment of mud water |
-
2000
- 2000-12-01 FR FR0016981A patent/FR2817489A1/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447344A (en) * | 1983-06-02 | 1984-05-08 | Nalco Chemical Company | Dewatering aids for coal and other mineral particulates |
| JPH01307492A (en) * | 1988-06-07 | 1989-12-12 | Iseki Tory Tech Inc | Treatment of mud water |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 014, no. 100 (C - 0693) 23 February 1990 (1990-02-23) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9161883B1 (en) * | 2011-01-10 | 2015-10-20 | R. Jeffrey Busbey | Adjustable return fitting |
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