AU749564B2 - Composition and process for the removal of the phosphate ion content of waters - Google Patents
Composition and process for the removal of the phosphate ion content of waters Download PDFInfo
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- AU749564B2 AU749564B2 AU12537/99A AU1253799A AU749564B2 AU 749564 B2 AU749564 B2 AU 749564B2 AU 12537/99 A AU12537/99 A AU 12537/99A AU 1253799 A AU1253799 A AU 1253799A AU 749564 B2 AU749564 B2 AU 749564B2
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- Australia
- Prior art keywords
- calcium
- waters
- iron compound
- composition according
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- Prior art date
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- 239000000203 mixture Substances 0.000 title claims description 51
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 title claims description 28
- 229940085991 phosphate ion Drugs 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 16
- 239000003643 water by type Substances 0.000 title claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 16
- 150000002506 iron compounds Chemical class 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 12
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 9
- 229910001424 calcium ion Inorganic materials 0.000 claims description 9
- 239000010457 zeolite Substances 0.000 claims description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 8
- 239000000920 calcium hydroxide Substances 0.000 claims description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 7
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000005995 Aluminium silicate Substances 0.000 claims description 6
- 229910021536 Zeolite Inorganic materials 0.000 claims description 6
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 6
- 235000012211 aluminium silicate Nutrition 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical class [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 150000002500 ions Chemical class 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 claims 4
- 230000003213 activating effect Effects 0.000 claims 1
- 229910019142 PO4 Inorganic materials 0.000 description 8
- 239000010452 phosphate Substances 0.000 description 8
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 235000010216 calcium carbonate Nutrition 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000000746 purification Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- -1 Fe(III) salt anions Chemical class 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 2
- JYIBXUUINYLWLR-UHFFFAOYSA-N aluminum;calcium;potassium;silicon;sodium;trihydrate Chemical compound O.O.O.[Na].[Al].[Si].[K].[Ca] JYIBXUUINYLWLR-UHFFFAOYSA-N 0.000 description 2
- 229910001603 clinoptilolite Inorganic materials 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000009837 dry grinding Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 235000019796 monopotassium phosphate Nutrition 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Water Treatment By Sorption (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Description
WO 99/24365 PCT/HU98/00096 COMPOSITION AND PROCESS FOR THE REMOVAL OF THE PHOSPHATE ION CONTENT OF WATERS The invention relates to a composition suitable for removing the phosphate ion content of waters and a process for producing the same.
The present invention also relates to a process for the removal of the phosphate ion content of water.
As a result of accumulation, the phosphate content of waters released into the environment causes serious environmental problems.
For this very reason, numerous methods have been worked out for the removal of phosphate ions in water, of which the solutions employing iron/zeolite systems are currently considered the most favourable in terms of the chemicals and equipment required and the removal efficiency achieved. The essence of this system lies in that the water to be treated is brought into contact with ferric/ferrous zeolite or a mixture of zeolite and a flocculation agent such as ferric hydroxide with a large specific surface or another ferrous substance. Iron/zeolite-type water purification formulations and their uses are described, among others, in Hungarian Patent Specification No. 195 457 and Japanese Patent Specifications 63- 40575-B4 and 07-284762-A2.
When preparing known iron/zeolite-type water purification formulations, always the aqueous solution of a ferrous/ferric salt is mixed with zeolite, and, if required, additional chemicals (such as alkalis) are added to the aqueous mixture, then the resulting slurry is precipitated and/or filtered, and the separated solid is dried. The treatment and dehydration of large volumes of aqueous material require a considerable investment of equipment and energy, which raises the cost of phosphate removal.
In the course of our work, we strived to find a technical solution whereby the equipment and energy required for the production of iron/zeolite-type water purification compositions could be significantly reduced, without negatively affecting the effectiveness of the composition.
In order to eliminate the equipment- and energy-intensive procedures (filtration and dehydration) of the aqueous processes, we attempted to make water purification compositions by dry grinding together air-dry zeolite varieties and hydrous ferrous/ferric salts; the phosphate removing effect of the resulting compositions, however, fell significantly short of that of the aqueous compositions, as expected.
Surprisingly, it was found, however, that if these components were ground together in the presence of a calcium ion source, compositions with excellent phosphate removing effect were obtained.
The invention, therefore, provides a composition useful for removing the phosphate ion content of waters. The composition of the invention contains 0.1-99.9 parts by mass of an iron compound, namely one or more solid hydrous Fe(II) or Fe(III) salts or their oxidized forms, ground dry together with 99.9-0.1 parts by mass of a porous aluminium silicate containing exchangeable ions (hereinafter: silicate component), and 0.1-10 moles of a solid calcium ion source, namely calcium uJ WS AMENDED SHEET 0 0 I 10o 'J 0 0 0 00 I0~3 o a carbonate along with either calcium oxide or calcium hydroxide or both per one mole of iron compound.
An essential feature of the iron compound that can be employed in the composition of the invention is that it should contain bound water.
We have found that the substitution of a particular hydrous ferrous/ferric salt with the chemically identical, but anhydrous salt can no longer ensure the desired results. The specific nature of the Fe(II) or Fe(III) salt anions is not critical. The hydrous ferrous/ferric salts can also be used in a partially oxidized form; such substances are formed from Fe(II) salts exposed to air. Fe(II) sulphate heptahydrate is a particularly advantageous choice for an iron compound.
The compositions of the invention can suitably contain 5 to preferably 10 to 90, more preferably 25 to 75 parts by mass of an iron compound.
The silicate component of the compositions of the invention can be any porous aluminium silicate containing exchangeable ions. For example, various natural zeolites and the formations containing them, as well as synthetic zeolites can be mentioned. Natural zeolites, such as clinoptilolite are especially useful on account of their availability and attractive price. The quantity of the silicate component in the compositions of the invention is suitably 5 to 95, preferably 10 to 90, more preferably 25 to 75 parts by mass. Certain silicate components (such as zeolites) adsorb water when exposed to air, which can only be removed by heat treatment at high temperatures. Such silicate components should suitably be used in air-dry not a previously heat-treated) condition.
AMENDED SHEEI o 1 0 0 0 0 0 1 M, a a 0 I n 0 The compositions of the invention can contain calcium carbonate along with either calcium oxide or calcium hydroxide or both as calcium ion source. Of these, a mixture of calcium hydroxide and calcium carbonate have proved especially suitable. These compounds are used as dry solids, the term "dry" also includes air-dry substances according to the above definition.
The molar ratio of iron to calcium in the compositions of the invention can be suitably 1:(0.3 to preferably 1:(0.5 to and more preferably 1:(0.9 to 1.2).
The terms "grinding" and "grinding together" are interpreted in their wide sense in the specification. These terms include every possible mechanochemical activation method.
The invention, furthermore, provides a process for producing a composition useful for removing the phosphate ion content of waters, wherein a mixture of 0.1 to 99.9 parts by mass of an iron compound, namely one or more solid hydrous Fe(II) or Fe(III) salts or the oxidized forms thereof, 99.9 to 0.1 parts by mass of a silicate component, and 0.1 to 10 moles of calcium carbonate along with either calcium oxide or calcium hydroxide or both per one mole of iron compound is mechanochemically activated by dry grinding.
Finally, the invention provides a process for removing the phosphate ion content of waters, wherein the water to be treated is brought into contact with the composition of the invention. For example, it is possible to proceed by passing the water to be treated through a column which contains the composition of the invention or adding the composition to the water to be treated, and, after the required time has LENDED
SHEET
AMENDED SHEET i 0 0 .i 0 n elapsed (and meanwhile mixing the system as appropriate), removing the composition from the treated water by filtration, precipitation or another suitable method. We have found that an especially good phosphate removing effect can be achieved when treating water at a pH of 4 to 8 (preferably between 4.5 and This pH value meets the dischargeability requirements.
The invention is described in detail in the following examples without any restriction on the scope of protection.
Example 1 The samples listed in Table I were prepared by intensely grinding quantities of Fe(II) sulphate heptahydrate, clinoptilolite, calcium hydroxide and calcium carbonate in different proportions (the compositions of the invention are denoted by serial numbers, while the control compositions are denoted by letters in the table). A sample of the compositions disclosed in Table 1 was added to 100 ml of model solution (aqueous potassium dihydrogen phosphate solution containing 20 ppm orthophosphate ions) in the quantity stated therein, then the phosphate ion concentration of the solution was measured after a period of 24 hours. The measurement results are set forth in Table 1.
As it can be established from the data in Table 1, neither component of the compositions of the invention can be omitted without a drastic reduction in the overall effect. This also proves that the individual components of the compositions of the invention (iron compound, silicate component and calcium ion source) synergistically enhance one another's activity.
AMENDED SHEE1 TL1I 1.I1 L-T- C rC-C-- C- I I P Sample Composition of Sample Sample added to Residual phosphate number FeSO 4 .711 2 0 Clinopti- Ca(OH) 2 CaCO3 100 ml'water content of Samuple)( loll t e(p J j 1 22.5 31.5 -8.0 0.0409 0.30 0.0702 0.04 2 22.5 31.5 1..0 7.0 0.0401 0.08 (i~I0.0705 03 3 22.5 31.5 2.0 6.0 .0.0403 0.13 m 0.0706 0.12 04 22.5 31.5 3. 0 5.0 0.0410 00 3:0.0712. 0 3 00 m 5 22.5 31.5 4.0 4.0 0.0412 0.11 0.0710 0.09 6 22.5 31.5 0.1 8.0 0.400 0.39
.Q
0.0703 a
I
Sample -Composition of sample Sample added to Residual phosphate number FeSO 4 .7-r 3 O Clinopti- Ca(O-) 2 C .aCO 3 100 ml water content of sampleX lolite (pm 7 22.5 31.5 0.5 7.5 0.0411 3.04 0 0.0710 0 000000 822.5 3i.5 1.0 6..0 0.0404 1.06 0.0704 0 o 0 9 12 150.25 3,5 '0.0408 7.4 0 1 0 13 0.0709 1.5 03 45.0 31.5 0.75 7.0 0.0401 0.72 0 0.0700 0 11 56.5 31.5 1.0 10.5 0410.2000 z0.0701 0 Ci12 67.5 31.5 1.25 15.0 .0.0401 0.06 0.0708 0 3 ni 0.D 0 4 0 0 I 13 45.0 31.5 1.0 15.0 0.0402 0.3 0.0703 0 14 67.5 31.5 1.5 21.5 0.0409 0.1 0.0703 0 I Sample Composition of sample Sample added to Residual phosphate number FeSO 4 .7Hj0 Clinopti- Ca(OU)3 CaCO] 100 ml water content of sape or mark lolit. pm 67.5 31.5 1.5 23.0 0.0403 0.1 0.0704 0 -31.5 0.5 7.0 0.0400 20.0 0.0703 20.0 0.0408 19.8 0.0701 20.0 WO22.5 7.5 0.0407 15.1 0.0702 12.1 0.5 8.0 0.0405 14.8 0.0703 12.8 NN22.5 31.5 0.0400 19.0 0.0702 17.2 Measured after a period of 48 hours 3 0 a 33 0 ai 0 3 Go3 600 3 0 7, 3 3- .1 0 n Example 2 This example was used to test how the phosphate ion removing effect is dependent on the pH of the water. The pH of a 2 0 0-ml water sample containing 11.68 ppm phosphate ions was set to the values stated in Table 2 with sulphuric acid or sodium hydroxide, 0.02 grams of composition No. 15 were added to the sample, and the residual phosphate ion content of the water was measured after periods of 24 and 48 hours. The results are set forth in Table 2.
0 Table 2 pH of water sample .3.1 5.3 7.2 9.4 11.0 Residual phosphate ion content (ppm) after 24 hours after 48 hours- 9.2 9.2 0 0 5.0 8.0 8.4 8.3 The data in the table demonstrate that phosphate ions can be most effectively removed from solutions having a pH of 4 to 8.
/Tok"~i 9a In this specification, except where the context requires otherwise, the words "comprise", "comprises", and "comprising" mean "include", "includes", and "including", respectively, ie when the invention is described or defined as comprising specified features, various embodiments of the same invention may also include additional features.
*o o o oo o oo H;\Shonal\Keep\Speci\12537-99 Claims 2/05/02
Claims (9)
1. A composition for removing the phosphate ion content of waters, which comprises 0.1 to 99.9 parts by mass of an iron compound selected from the group of solid hydrous Fe(II) and Fe(III) salts and oxidized forms thereof, ground dry together with 99.9 to 0.1 parts by mass of a porous aluminium silicate containing exchangeable ions, and 0.1 to 10 moles of a calcium ion source namely calcium carbonate along with either calcium oxide or calcium hydroxide or both per one mole of iron compound.
2. The composition according to claim 1, which comprises Fe(II) sulphate heptahydrate as the iron compound.
3. The composition according to claim 1 or 2, which comprises a natural or synthetic zeolite as the aluminium silicate. S4. The composition according to any one of claims 1 to 3, which comprises a mixture of calcium hydroxide and calcium carbonate as the calcium ion source.
5. The composition according to any one of claims 1 to 4, which comprises an iron compound of 25 to 75 parts by mass.
6. The composition according to any one of claims 1 to 5, which comprises an aluminium silicate of 25 to f parts by mass. H.\Shonal\Keep\Speci\12537-99 Claims 2/05/02 11
7. The composition according to any one of claims 1 to 6, which comprises the iron compound and the calcium ion source in a molar ration of 1:(0.5 to 3) iron:calcium.
8. The composition according to any one of claims 1 to 7, which comprises the iron compound and the calcium ion source in a molar ration of 1:(0.9 to 1.2) iron:calcium.
9. A process for producing a composition useful for removing the phosphate ion content of waters, which comprises mechanochemically activating a mixture of 0.1 to
99.9 parts by mass of one or more iron compound(s) selected from the group of solid hydrous Fe(II) and Fe(III) salts and oxidized froms thereof, 99.9 to 0.1 S. parts by mass of a porous aluminium silicate containing exchangeable ions, and 0.1 to 10 moles of a calcium ion source selected from the group of calcium hydroxide, calcium oxide and calcium carbonate per one mole of iron compound. 10. A process for removing the phosphate ion content of waters, which comprises contacting the water to be treated with a composition according to any of claims 1 to 25 8. 11. The process according to claim 10, which comprises treating water at a pH of 4 to 8. 12. A composition for removing the phosphate ion content of waters substantially as herein described with c 41 reference to any one of the examples. H;\Shonal\Keep\Speci\12537-99 Claims 2/05/02 12 13. A process for producing a composition useful for removing the phosphate ion content of waters substantially as herein described with reference to any one of the examples. 14. A process for removing the phosphate ion content of waters substantially as herein described with reference to any one of the examples. Dated this 2 nd day of May 2002 MAGYAR TUDOMANYOS AKADEMIA KEMIAI KUTATOKOZPONT By their Patent Attorneys GRIFFITH HACK Fellows Institute of Patent and Trade Mark Attorneys of Australia 0 0* H.\Shonal\Keep\Speci\12537-99 Claims 2/05/02
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HU9701918A HUP9701918A2 (en) | 1997-11-07 | 1997-11-07 | Method and composition for removing of phosphor contain of water |
| HU9701918 | 1997-11-07 | ||
| PCT/HU1998/000096 WO1999024365A1 (en) | 1997-11-07 | 1998-11-06 | Composition and process for the removal of the phosphate ion content of waters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1253799A AU1253799A (en) | 1999-05-31 |
| AU749564B2 true AU749564B2 (en) | 2002-06-27 |
Family
ID=89995724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU12537/99A Ceased AU749564B2 (en) | 1997-11-07 | 1998-11-06 | Composition and process for the removal of the phosphate ion content of waters |
Country Status (10)
| Country | Link |
|---|---|
| AU (1) | AU749564B2 (en) |
| DE (1) | DE19882795T1 (en) |
| DK (1) | DK200000761A (en) |
| FI (1) | FI20001077A (en) |
| GB (1) | GB2346875A (en) |
| HU (1) | HUP9701918A2 (en) |
| NO (1) | NO20002436L (en) |
| NZ (1) | NZ504824A (en) |
| SE (1) | SE0001712L (en) |
| WO (1) | WO1999024365A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3629634A1 (en) * | 1986-08-30 | 1988-03-03 | Swf Auto Electric Gmbh | ELECTRICAL MACHINE, ESPECIALLY ELECTRIC MOTOR |
| FI117162B (en) * | 2005-06-17 | 2006-07-14 | Maa Ja Elintarviketalouden Tut | Filter material for removing phosphor from waste water originating from e.g. scattered settlement and/or leachate, comprises lightweight aggregate, calcium hydroxide and water which have been mixed by grinding during preparation |
| CN102328984B (en) * | 2011-08-11 | 2013-08-14 | 四川龙蟒钛业股份有限公司 | Processing method of waste water in phosphorus chemical industry |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4415467A (en) * | 1981-03-05 | 1983-11-15 | Colloid Piepho | Agent for the purification of waste waters and process for its production |
| JPH08168607A (en) * | 1994-12-15 | 1996-07-02 | Kanken:Kk | Cutting oil flocculating treatment agent |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2801034A1 (en) * | 1978-01-11 | 1979-07-12 | Hoechst Ag | FLOCCULATING AGENT FOR CLEANING WASTE WATER |
| JPS57135012A (en) * | 1981-02-13 | 1982-08-20 | Minato Sangyo Kk | Water treating agent |
| EP0612692B1 (en) * | 1993-02-26 | 1999-01-20 | Createrra Inc. | Method for production of water purifying substances |
| JPH09225208A (en) * | 1996-02-21 | 1997-09-02 | Kunimine Kogyo Kk | Sewage treating agent and treating method |
-
1997
- 1997-11-07 HU HU9701918A patent/HUP9701918A2/en unknown
-
1998
- 1998-11-06 WO PCT/HU1998/000096 patent/WO1999024365A1/en active IP Right Grant
- 1998-11-06 DE DE19882795T patent/DE19882795T1/en not_active Withdrawn
- 1998-11-06 GB GB0013638A patent/GB2346875A/en not_active Withdrawn
- 1998-11-06 AU AU12537/99A patent/AU749564B2/en not_active Ceased
- 1998-11-06 NZ NZ504824A patent/NZ504824A/en unknown
-
2000
- 2000-05-08 DK DK200000761A patent/DK200000761A/en not_active Application Discontinuation
- 2000-05-08 SE SE0001712A patent/SE0001712L/en not_active Application Discontinuation
- 2000-05-08 FI FI20001077A patent/FI20001077A/en unknown
- 2000-05-11 NO NO20002436A patent/NO20002436L/en not_active Application Discontinuation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4415467A (en) * | 1981-03-05 | 1983-11-15 | Colloid Piepho | Agent for the purification of waste waters and process for its production |
| JPH08168607A (en) * | 1994-12-15 | 1996-07-02 | Kanken:Kk | Cutting oil flocculating treatment agent |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20002436L (en) | 2000-06-02 |
| GB2346875A (en) | 2000-08-23 |
| SE0001712D0 (en) | 2000-05-08 |
| NZ504824A (en) | 2001-10-26 |
| HU9701918D0 (en) | 1998-01-28 |
| NO20002436D0 (en) | 2000-05-11 |
| DK200000761A (en) | 2000-06-29 |
| DE19882795T1 (en) | 2001-03-29 |
| HUP9701918A2 (en) | 2003-03-28 |
| SE0001712L (en) | 2000-06-20 |
| WO1999024365A1 (en) | 1999-05-20 |
| FI20001077A (en) | 2000-06-27 |
| GB0013638D0 (en) | 2000-07-26 |
| AU1253799A (en) | 1999-05-31 |
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