NO790077L - FURNITURE FOR WASTE CLEANING - Google Patents
FURNITURE FOR WASTE CLEANINGInfo
- Publication number
- NO790077L NO790077L NO790077A NO790077A NO790077L NO 790077 L NO790077 L NO 790077L NO 790077 A NO790077 A NO 790077A NO 790077 A NO790077 A NO 790077A NO 790077 L NO790077 L NO 790077L
- Authority
- NO
- Norway
- Prior art keywords
- lime
- water
- mixture
- waste water
- agent according
- Prior art date
Links
- 238000004140 cleaning Methods 0.000 title claims description 3
- 239000002699 waste material Substances 0.000 title 1
- 239000002351 wastewater Substances 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 239000008394 flocculating agent Substances 0.000 claims description 14
- 229910001868 water Inorganic materials 0.000 claims description 13
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- 239000000920 calcium hydroxide Substances 0.000 claims description 9
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 9
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000005469 granulation Methods 0.000 claims description 7
- 230000003179 granulation Effects 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- 235000012255 calcium oxide Nutrition 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000010841 municipal wastewater Substances 0.000 claims description 4
- 239000005997 Calcium carbide Substances 0.000 claims description 3
- 238000002309 gasification Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 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 claims description 3
- 238000000227 grinding Methods 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 description 11
- 235000021317 phosphate Nutrition 0.000 description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 7
- 239000010452 phosphate Substances 0.000 description 6
- 239000010802 sludge Substances 0.000 description 6
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 5
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- 238000012851 eutrophication Methods 0.000 description 3
- 241000195493 Cryptophyta Species 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003599 detergent Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010796 biological waste Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- -1 on the one hand Inorganic materials 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 229940085991 phosphate ion Drugs 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000247 postprecipitation Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 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)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
Description
Fnokningsmlddel til rensing av avvann.Flocking agent for wastewater treatment.
Oppfinnelsen vedrører fnokningsmidler for rensing av avvann, spesielt kommunale avvann, til nedsettelse av de or gart-niske avfallsstoffer, som dels foreligger kolloid, dels oppløst i avvannet, og fjerning av de^ oppløste fosfater. The invention relates to flocculating agents for the purification of waste water, especially municipal waste water, to reduce the organic waste substances, which are partly colloidal, partly dissolved in the waste water, and to remove the dissolved phosphates.
Sivilasjonsmessige påvirkninger aksellererer eutrofering av alle stående vann. Med eutrofering forstås nærings-stoff anrikning i vannet, som deres følge opptrer en sterk vekst, spesielt av planktonalger. Etter utrydning av algene synker disse i de dypere vannsjikt og spaltes derved bakterielt under oksygenforbruk. Civilizational influences accelerate the eutrophication of all standing water. Eutrophication means nutrient enrichment in the water, as a result of which there is a strong growth, especially of planktonic algae. After the algae have been eradicated, these sink into the deeper water layers and thereby decompose bacterially under oxygen consumption.
En mulighet for tilbaketrengning av eutrofering består i nedsettelse av fosfatlasten og avvannets CSB-kjenneverdi. Til fosfatlast regnes også kondenserte fosfater, som hovedsakelig stammer fra vaskemidler. De kondenserte fosfater spaltes hydro-lytisk til enkle fosfater, katalysert av mikroorganismer, avhengig av avvannets pH-verdi og temperatur. One possibility for reducing eutrophication consists in reducing the phosphate load and the wastewater's CSB characteristic value. Phosphate cargo also includes condensed phosphates, which mainly originate from detergents. The condensed phosphates are split hydrolytically into simple phosphates, catalysed by microorganisms, depending on the water's pH value and temperature.
CSB- er en kjenneverdi for avvanninnholdsstoffer og angir det kjemiske oksygenbehov. CSB- is a characteristic value for wastewater constituents and indicates the chemical oxygen demand.
For fjerning av fosfatene og en del av de organiske stoffer fra kommunale avvann er det foreslått mange kjemiske fremgangsmåter og også anvendt slike. En oversikt over publika-sjoner til fosfatfjerning av avvann ved hjelp av jern-, aluminium-eller kalsium-salter er angitt i Zeitschrift flir angewandte Chemie 88, hefte 11 (1976), side 354-365. For the removal of the phosphates and some of the organic substances from municipal waste water, many chemical methods have been proposed and used. An overview of publications on phosphate removal from waste water using iron, aluminum or calcium salts is given in Zeitschrift flir angewandte Chemie 88, issue 11 (1976), pages 354-365.
I DOS 2.147.999 omtales anvendelse av FeCl3eller Fe2(S04)3for utfnokning av forurensninger i avvann. In DOS 2,147,999, the use of FeCl3 or Fe2(S04)3 for the removal of pollutants in waste water is mentioned.
Aluminiumsulfat i forbindelse med en forklaring ved hjelp av brent eller lesket kalk omtales i DOS 1.517.723. Aluminum sulphate in connection with an explanation using burnt or slaked lime is mentioned in DOS 1,517,723.
Ifølge DOS 1.642.399 skal fosfatet fjernes fra avvann ved en kalkdosering med en pH-verdi mellom 8 og 9. According to DOS 1,642,399, the phosphate must be removed from waste water by lime dosing with a pH value between 8 and 9.
I DOS 1.926.969 omtales en fremgangsmåte til fosfatfjerning fra avvann med treverdige sjeldne jordmetaller. DOS 1,926,969 describes a method for phosphate removal from waste water with trivalent rare earth metals.
En kombinasjon av en blanding av kalsiumhydroksyd og hydroksydet av et treverdig metall (jern-III-salt) omtales til utfelling av anionaktive detergenter ved en pH-verdi på ca. 10-11 A combination of a mixture of calcium hydroxide and the hydroxide of a trivalent metal (iron-III salt) is said to precipitate anionic detergents at a pH value of approx. 10-11
i kokevarme i DOS 1.517.678. Mengden av det treverdige metall skal minst utgjøre omtrent en tiendedel av den anvendte mengde kalsiumhydroksyd. in boiling heat in DOS 1,517,678. The amount of the trivalent metal must be at least approximately one tenth of the amount of calcium hydroxide used.
Oppfinnelsens gjenstand er fnokningsmiddel for rensing av avvann, og: som er oppbygget av jern-III-sulfat og lesket kalk og sammen i granulert form muliggjør en lett, apparativ enkel fnékningsmiddeldosering uten at renset avvanns pH-verdi endres. Tilsetning av fnokningsmidler kan, da avvannets pH-verdi ikke endres, foretas i trinnet av biologisk avvannoppberedning. Ved utfelling av gips avlastes på den ene side sulfatfrakt med avvannet, på den annen side fremkommer et tett slam med over 10 g tørrstoff/100 g slam som avvannes godt i denne form og kan depo-neres . The object of the invention is a flocculant for wastewater treatment, and: which is made up of iron III sulfate and slaked lime and together in granulated form enables a light, apparatus-based, simple flocculant dosage without changing the pH value of purified wastewater. Addition of flocculating agents can, as the water's pH value does not change, be carried out in the stage of biological waste water treatment. During the precipitation of gypsum, on the one hand, sulphate transport is relieved with the dewatered water, on the other hand, a dense sludge with more than 10 g of dry matter/100 g of sludge is produced, which is well dewatered in this form and can be deposited.
Fnokningsmiddel ifølge oppfinnelsen for rensing av avvann, spesielt av kommunale avvann består av jern-III-sulfat og kalk og er granulert. The flocculant according to the invention for cleaning waste water, especially municipal waste water, consists of iron III-sulphate and lime and is granulated.
Det foreslåtte fnokningsmiddel skal ha et vektsforhold mellom kalk og jern-III-sulfat på 1:2 til 10, fortrinnsvis 1:4 til 5 . The proposed flocculant must have a weight ratio between lime and iron III-sulphate of 1:2 to 10, preferably 1:4 to 5.
Fnokningsmidlehe kan som kalk inneholde såvel brent som også lesket kalk, spesielt imidlertid også det ved kalsium-karbidforgassing dannede kalsiumhydroksyd. As lime, the flocculant can contain burnt as well as slaked lime, but especially the calcium hydroxide formed by calcium carbide gasification.
Fnokningsmidlene anvendes fortrinnsvis som granuler med en diameter på mindre enn 10 mm, fortrinnsvis med en diameter på 1-3 mm. The fluffing agents are preferably used as granules with a diameter of less than 10 mm, preferably with a diameter of 1-3 mm.
Det er hensiktsmessig å fremstille fnokningsmidlerIt is appropriate to produce fluffing agents
ved at man blander jern-III-sulfat og kalk og granulerer denne blanding under påsprøytning av vann i en granuleringstrommel eller på en granuleringstallerken. by mixing iron-III sulphate and lime and granulating this mixture while spraying water in a granulation drum or on a granulation plate.
En utformning av fremstillingen av fnokningsmidlet ligger deri at under- og overkom frasiktes og etter oppmaling av overkomet tilbakeføres igjen i granuleringsprosessen. One design of the production of the fluffing agent lies in the fact that the under and overcoats are sieved and after grinding the overcoats are returned to the granulation process.
Fnokningsmidlene ifølge oppfinnelsen er da fnokningsmiddel til setningen ikke bevirker noen pH-veri endringer av avvannet anvendbar i forfelling, simultanutfelling eller etterutfelling. Det har videre vist seg overraskende at sterkt uavhengig av pH-området finner det sted en god fnokkedannelse. Fnokningsmidlene ifølge oppfinnelsen kan også settes direkte i den biologiske av-vannresning. Den nødvendige mengde fnokningsmiddel er avhengig av avvannet tilsmussing, spesielt med hensyn til fosfationekonsen-trasjonen, CSB-verdien, avvannets pH-verdi og den ønskede rense-grad. Til oppnåelse av et fosfats sluttinnhold på under 1 mg P/l og en CSB-verdi på 70 mg 0~/l er det tilstrekkelig med en dosering på 250 g fnokningsmiddel/m avvann ved en P-innløpskonsentrasjon på 20 mg P/l og en CSB-verdi på 350 mg 02/l ved en pH-verdi mellom 6,5 og 7,5. The flocculants according to the invention are, as the flocculants for the setting do not cause any pH changes in the wastewater, usable in pre-precipitation, simultaneous precipitation or post-precipitation. It has also surprisingly been shown that, strongly independent of the pH range, good fleck formation takes place. The flocculants according to the invention can also be placed directly in the biological wastewater treatment plant. The required amount of flocculant depends on the dewatered soiling, especially with regard to the phosphate ion concentration, the CSB value, the pH value of the water and the desired degree of purification. To achieve a final phosphate content of less than 1 mg P/l and a CSB value of 70 mg 0~/l, a dosage of 250 g flocculating agent/m of wastewater is sufficient at a P inlet concentration of 20 mg P/l and a CSB value of 350 mg 02/l at a pH value between 6.5 and 7.5.
FremstillingseksempelManufacturing example
FéS04 . 7 H20 avvannes i et foretrukket trinn til FeSO^. H20. (Dette produkt er tilgjengelig som handelsvare). FeS04«H20 oppoksyderes ifølge DOS 2. 446.544 i dreierør ved 500°C under lufttilgang til en blanding av Fe^SO^)^og a-Fe^^O^. Den uopp-løselige del av Fe203oppsluttes med overskytende H2S04(ca. 10% overskudd) til Fe2(S04)3. Det derved dannede Fe2(S04)3inneholder 2,95% fri svovelsyre og et SO^ : Fe^<+->forhold på 1,6. Dette produkt blandes i paddelakselblander med kalkhydrat fra kalsium-karbidforgasning. Kalkhydratet inneholdt ca. 71% CaO. Blandings-forholdet Fe2(S04)3:Ca(OH)2 ble innstillet på 4,0:1. Ved på-sprøytning av 135 g H20 pr.kg;Fe2(S04)3-Ca(OH)2~blanding ble det oppnådd en granulering. Fraksjonen på 1-3 mm ble utsiktet.. En FéS04 . 7 H2O is dewatered in a preferred step to FeSO^. H20. (This product is available as a commercial product). FeS04«H20 is oxidized according to DOS 2. 446,544 in a rotating tube at 500°C under air access to a mixture of Fe^SO^)^ and a-Fe^^O^. The insoluble part of Fe203 is dissolved with excess H2S04 (approx. 10% excess) to Fe2(S04)3. The resulting Fe2(SO4)3 contains 2.95% free sulfuric acid and a SO^ : Fe^<+-> ratio of 1.6. This product is mixed in paddle shaft mixers with lime hydrate from calcium carbide gasification. The lime hydrate contained approx. 71% CaO. The mixing ratio Fe2(SO4)3:Ca(OH)2 was set at 4.0:1. By spraying on 135 g of H 2 O per kg;Fe 2 (SO 4 ) 3 -Ca(OH) 2 ~ mixture, a granulation was achieved. The fraction of 1-3 mm became the view.. One
2-oppløsning av blandingen viste i den oppløste fase et S04 : Fe-forhold på 1,42. 2-dissolution of the mixture showed in the dissolved phase a SO 4 : Fe ratio of 1.42.
AnvendeIseseksempelUseIce example
Det etter fremstillingseksemplet dannede granulerte fnokningsmiddel ble tildosert til det biologiske trinn av et halvteknisk klaringsanlégg, nemlig 440 g/h fnokningsmiddel pr. 2 m 3/h avvann. Avvannet som skulle renses hadde en CSB-kjennverdi på 32 0 mg 02/l, 18 mg P/l og en pH-verdi på 7,3. Etter en oppholdstid på 2 timer i fnokningsbasseng og en etterfølgende sedimentasjonstid på 1,5 timer ble det rensede avvann analysert: I det rensede avvann ble det bestemt en CSB-kjennverdi på 62 mg 02/l, 0,6 mg P/l og en pH-verdi på 7,3. De dannede fnokker hadde en størrelse mellom 2 og 3 mm. The granulated flocculant formed according to the production example was dosed to the biological stage of a semi-technical clarification plant, namely 440 g/h flocculant per 2 m 3/h wastewater. The wastewater to be treated had a CSB characteristic value of 32 0 mg 02/l, 18 mg P/l and a pH value of 7.3. After a residence time of 2 hours in the settling basin and a subsequent sedimentation time of 1.5 hours, the purified wastewater was analyzed: In the purified wastewater, a CSB characteristic value of 62 mg 02/l, 0.6 mg P/l and a pH value of 7.3. The flakes formed had a size between 2 and 3 mm.
Avsetningshastigheten av utfellingsfnokkene i beger-glass ble fastslått med 6 minutter. Det fjernede slam hadde et tørrstoffinnhold på 12,0%. Den uorganiske del av slammet ut-gjorde 35%, referert til tørt slam. The deposition rate of the precipitation flecks in beaker glass was determined to be 6 minutes. The removed sludge had a solids content of 12.0%. The inorganic part of the sludge accounted for 35%, referred to dry sludge.
SammenligningseksempelComparative example
Anvendelseseksemplet ble gjentatt uten tilsetning av fnokningsmiddel. Det fjernede slam hadde et tørrstoffinnhold på 3,3%. I det rensede avvann ble det bestemt en CSB-kjennverdi på 9 8 mg 02/l, 15 mg P/l og en pH-verdi på 7,5. The application example was repeated without the addition of fluffing agent. The removed sludge had a solids content of 3.3%. In the purified wastewater, a CSB characteristic value of 98 mg O2/l, 15 mg P/l and a pH value of 7.5 was determined.
Claims (8)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782801034 DE2801034A1 (en) | 1978-01-11 | 1978-01-11 | FLOCCULATING AGENT FOR CLEANING WASTE WATER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO790077L true NO790077L (en) | 1979-07-12 |
Family
ID=6029303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO790077A NO790077L (en) | 1978-01-11 | 1979-01-10 | FURNITURE FOR WASTE CLEANING |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0003119A1 (en) |
| AT (1) | AT363867B (en) |
| DE (1) | DE2801034A1 (en) |
| NO (1) | NO790077L (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3908054A1 (en) * | 1989-03-13 | 1990-09-20 | Hoelzle & Chelius Gmbh | Process for the preparation of a flocculant |
| CH680586A5 (en) * | 1989-03-23 | 1992-09-30 | Aquamot Ag | |
| HUP9701918A2 (en) * | 1997-11-07 | 2003-03-28 | MTA Központi Kémiai Kutató Intézete | Method and composition for removing of phosphor contain of water |
| JP6301802B2 (en) * | 2014-10-03 | 2018-03-28 | デクセリアルズ株式会社 | Water purification agent and water purification method |
| EP3563917A1 (en) * | 2018-05-03 | 2019-11-06 | Schaefer Kalk GmbH & Co. KG | Agent for lowering the phosphate content in waste waters |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE880877C (en) * | 1941-01-14 | 1953-06-25 | Hoechst Ag | Process for the production of a flocculant for water purification |
| FR2129035A5 (en) * | 1971-03-12 | 1972-10-27 | Seta Ste Nouvelle | Effluent treatment - by flocculation with activated lime followed by sepn |
| DE2527987C3 (en) * | 1975-06-24 | 1984-08-23 | Ralf F. Piepho, Abwassertechnik GmbH, 3015 Wennigsen | Process for the production of an agent for purifying waste water |
-
1978
- 1978-01-11 DE DE19782801034 patent/DE2801034A1/en not_active Withdrawn
-
1979
- 1979-01-08 EP EP79100041A patent/EP0003119A1/en not_active Ceased
- 1979-01-09 AT AT0016379A patent/AT363867B/en not_active IP Right Cessation
- 1979-01-10 NO NO790077A patent/NO790077L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AT363867B (en) | 1981-09-10 |
| ATA16379A (en) | 1981-01-15 |
| EP0003119A1 (en) | 1979-07-25 |
| DE2801034A1 (en) | 1979-07-12 |
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