NO763167L - - Google Patents
Info
- Publication number
- NO763167L NO763167L NO763167A NO763167A NO763167L NO 763167 L NO763167 L NO 763167L NO 763167 A NO763167 A NO 763167A NO 763167 A NO763167 A NO 763167A NO 763167 L NO763167 L NO 763167L
- Authority
- NO
- Norway
- Prior art keywords
- water
- flotation
- sludge
- flocculation
- basin
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 238000005188 flotation Methods 0.000 claims description 20
- 239000010802 sludge Substances 0.000 claims description 17
- 238000005189 flocculation Methods 0.000 claims description 12
- 230000016615 flocculation Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000006185 dispersion Substances 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 239000008213 purified water Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 description 13
- 238000004140 cleaning Methods 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Physical Water Treatments (AREA)
Description
Fremgangsmåte ved rensning av vannProcedure for purifying water
Foreliggende oppfinnelse angår en fremgangsmåte ved rensning av vann, ved hvilken kalk tilsettes vannet for å tilveiebringe en fnokning i ett eller flere fnokningsbassenger, hvprefter fnokkene i et etterfølgende basseng skilles fra det rensede vann og danner et slam. Det karakteristiske for fremgangsmåten er at en del av det således dannede slam tilbakeføres til ett eller flere av fnokningsbassengene, hvor det bringes til å danne en slamsone gjennom hvilken det til fnokningsbassenget eller bassengene kommende vann som skal renses, får passere, og at den etterføl-gende fnokkfraskillelse tilveiebringes ved flotasjon i et flota-sjonsbasseng. The present invention relates to a method for purifying water, in which lime is added to the water to provide flocculation in one or more flocculation pools, after which the flocculation in a subsequent pool is separated from the purified water and forms a sludge. The characteristic feature of the method is that part of the thus formed sludge is returned to one or more of the flocculation basins, where it is caused to form a sludge zone through which the water coming to the flocculation basin or pools to be cleaned is allowed to pass, and that the subsequent ongoing floc separation is provided by flotation in a flotation basin.
Ved en foretrukken utførelsesform tas dispersjonsvannet til flotas.jonen fra det rensede vann som går ut fra flotasjons-bassenget. In a preferred embodiment, the dispersion water for the flotation is taken from the purified water that leaves the flotation pool.
Ved fremgangsmåten ifølge oppfinnelsen kan oppløste, organiske stoff skilles fra avvahnet på grunn av at disse stoffer vil inngå i kjemiske reaksjoner i forbindelse med dannelsen av blant annet kalsiumcarbonat og andre carbonforbindelser på grunn av høy pH (pH 10 - 12,5) og kalktilsetning. With the method according to the invention, dissolved organic substances can be separated from the dewaxed water because these substances will be included in chemical reactions in connection with the formation of, among other things, calcium carbonate and other carbon compounds due to the high pH (pH 10 - 12.5) and the addition of lime.
Disse dannede faste partikler adderer til de i samme prosess dannede kalsiumhydroxyd- og kalsiumfosfatfnokker, hvilke kan effektivt separeres ved flotasjon. These formed solid particles add to the calcium hydroxide and calcium phosphate flocs formed in the same process, which can be effectively separated by flotation.
Oppfinnelsen fører til at reduksjonen av såvel biologiske som kjemiske oxygenforbrukende organisk oppløste stoff i avvannet blir vidtgående, i et normalt kommunalt avvann opp til ca. 90 %, og dette skjer parallelt med tilsvarende vidtgående fosforreduksjon. Prosessen medfører herved også reduksjon av organisk bundet nitrogen. The invention leads to the reduction of both biological and chemical oxygen-consuming organically dissolved substances in the wastewater to be far-reaching, in normal municipal wastewater up to approx. 90%, and this happens in parallel with a corresponding far-reaching phosphorus reduction. The process thereby also entails a reduction of organically bound nitrogen.
På grunn av fIotasjonsfremgangsmåten medfører fremgangsmåten ifølge oppfinnelsen en forholdsvis lav kjemikalietil- setning til avvannet. Dessuten motvirker det forsuring av vass-drag på grunn av høy pH på utgående, renset avvann, samt forbed-rer og gjør slamhåndteringen billigere på grunn av høyere tørr-substansinnhold, kalkinnholdet i slammet og den høye pH-verdi på utgående slam. Due to the flotation method, the method according to the invention entails a relatively low addition of chemicals to the waste water. It also counteracts the acidification of waterways due to the high pH of outgoing, purified wastewater, as well as improves and makes sludge handling cheaper due to the higher dry substance content, the lime content in the sludge and the high pH value of outgoing sludge.
Med flotasjon menes i denne sammenheng at en separat strøm av vann ved hjelp av trykkforhøyelse, luftinnblanding og hurtig trykkavlastning av luft-vannblanding tilveiebringer en dis-persjon av finfordelte luftbobler som fester seg til de med kalk tilveiebragte fnokker og fører disse fnokker opp til vannoverflaten som et slam. Ved den høye pH-verdi i avvannet skjer samtidig på grunn av dispersjonen en avdrivning av NH^fra avvannet. In this context, flotation means that a separate flow of water by means of pressure increase, air mixing and rapid pressure relief of the air-water mixture provides a dispersion of finely distributed air bubbles which attach to the flocs provided with lime and bring these flocs up to the water surface which a sludge. At the high pH value in the waste water, due to the dispersion, NH^ is removed from the waste water at the same time.
Oppfinnelsen skal beskrives nærmere i tilslutning til den vedlagte tegning som illustrerer et par anlegg ved hvilke rensning av vann tilveiebringes ved hjelp av felling med kalk og etterfølgende flotasjon. Fig. 1 viser et anlegg for biologisk-kjemisk rensning, mens The invention is to be described in more detail in connection with the attached drawing which illustrates a couple of plants in which purification of water is provided by means of precipitation with lime and subsequent flotation. Fig. 1 shows a facility for biological-chemical cleaning, while
Fig. 2 viser et anlegg for kjemisk rensning.Fig. 2 shows a facility for chemical cleaning.
Anlegget ifølge fig. 1 innbefatter et basseng 1 for biologisk luftning, et basseng 2 for mellomavskillelse av fnokker, ett eller flere fnokningsbasseng 3 samt et fIotasjonsbasseng 4. Med pilen 5 markeres det innkommende, forurensede vann, og med 6 det utgående, rensede vann. Efter bassenget 2 og før flotasjons-bassengene 3 tilføres feldningskjemikalier ved pilen 7. Den biologiske luftning ved basseng 1 kan skje efter forsedimentering. Med 8 betegnes en ledning eller tilsvarende for tilbakeføring av fraskilt aktivt slam. The plant according to fig. 1 includes a pool 1 for biological aeration, a pool 2 for intermediate separation of fluff, one or more fluffing pools 3 and a flotation pool 4. The incoming, polluted water is marked with the arrow 5, and the outgoing, purified water with 6. After pool 2 and before flotation pools 3, precipitation chemicals are added at arrow 7. The biological aeration at pool 1 can take place after pre-sedimentation. 8 denotes a line or equivalent for the return of separated activated sludge.
Det for flotasjonen nødvendige dispersjonsvann taes ut fra utgående renset vann i en mengde på 5 - 20 % av strømmen. Dette vann settes under trykk og forsynes med luftoxygeh, hvoret-ter trykkavlastningen skjer, og meget.finfordelte mikroskopiske luftblærer erholdes, den såkaldte luftdispersjon, som hefter fast til smussfnokkene og løfter disse opp til vannoverflaten. The dispersion water required for flotation is taken from outgoing purified water in a quantity of 5 - 20% of the flow. This water is pressurized and supplied with air oxygen, after which the pressure is relieved, and very finely divided microscopic air bubbles are obtained, the so-called air dispersion, which adheres to the dirt particles and lifts them to the surface of the water.
Det i fig. 2 viste anlegg for kjemisk rensning innbefatter i stedet for bassengene 1 og 2 ifølge fig. 1 et forsedi-menteringsbasseng. 9. Forøvrig er anleggene like. That in fig. 2 shown plant for chemical cleaning includes instead of the pools 1 and 2 according to fig. 1 a sedimentation basin. 9. Otherwise, the facilities are the same.
Ved rens^ning av vannet anvendes kalk som fellingsmid-When cleaning the water, lime is used as a precipitating agent
del i forbindelse med efterfølgende.separering av smussfnokker ved hjelp av flotasjon. Herved kan kjemikalieforbruket kraftig minskes samtidig som renseeffekten øker på grunn av de tidligere angitte omstendigheter. part in connection with the subsequent separation of dirt flocs by means of flotation. In this way, chemical consumption can be greatly reduced at the same time as the cleaning effect increases due to the previously stated circumstances.
Dispersjonsvannet 11 til flotasjonen, som taes fra det utgående rensede vann 12, har en pH-verdi på ca. 10 - 11. Dette innvirker gunstig på fnokkdannelsen og på effekten ved separerin- The dispersion water 11 for the flotation, which is taken from the outgoing purified water 12, has a pH value of approx. 10 - 11. This has a favorable effect on the formation of fluff and on the effect of separation
gen i fIotasjonsbassenget 4. again in the flotation pool 4.
Dispersjonen 11 med pH 10 - 11 med sitt oppløste oxygen avdriver carbondioxyd, nitrogen etc, hvilket innsparer fellings-kjemikalier og øker effekten av avskillelsen av forurensninger i fIotasjonsbassenget. The dispersion 11 with pH 10 - 11 with its dissolved oxygen drives off carbon dioxide, nitrogen etc., which saves precipitation chemicals and increases the effect of the separation of pollutants in the flotation basin.
Det kalkholdige slam 13 fra flotasjonen innføres i nær-heten av bunnen i det første fnokningsbasseng 3, som det fremgår av henvisningsbetegnelsen 14, hvorved det har oppoverrettet strøm-ning. Samtidig innføres klart vann 15 fra det biologiske trin, henholdsvis forsedimenteringstrinnet ved samme bunn. Slammet kan også tilføres oventil i det annet fnokningsbasseng 3, som det fremgår av henvisningsbetegnelsen 16. Ifølge en ytterligere ut-førelsesform kan slammet tilføres både ved 14 og 16. For disse tilfeller gjelder at minst en slamsone 17 oppstår, gjennom hvilken det biologisk rensede eller eller bare avslammede vann 15 passerer på grunn av blant annet forskjell i. strømningshastigheten hos fa- The calcareous sludge 13 from the flotation is introduced near the bottom of the first flocculation basin 3, as is evident from the reference designation 14, whereby it has an upward flow. At the same time, clear water 15 is introduced from the biological stage, respectively the pre-sedimentation stage at the same bottom. The sludge can also be supplied from above in the second flocculation basin 3, as is evident from the reference designation 16. According to a further embodiment, the sludge can be supplied both at 14 and 16. For these cases, at least one sludge zone 17 occurs, through which the biologically cleaned or or only de-sludged water 15 passes due to, among other things, the difference in the flow rate at fa-
sen av rent vann og hos slampartiklene forårsaket av blant annet vannfasens og slamfasens forskjellige volumvekt. Herved tilveiebringes en virkning som er sammenlignbar med utfelling.på fast bæ-rermateriale, f.eks. ved passasje gjennom filter. of pure water and of the sludge particles caused by, among other things, the different volume weights of the water phase and the sludge phase. This provides an effect which is comparable to precipitation on solid carrier material, e.g. by passage through the filter.
Med denne metode kan fellingen skje ved ca. en pH-en-With this method, felling can take place at approx. a pH-a-
het lavere enn uten denne foranstaltning. Herved erholdes dels minsket kjemikalieforbruk, og delsøket fosforreduksjon. was lower than without this measure. This results in partly reduced chemical consumption, and partly in phosphorus reduction.
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7510387A SE7510387L (en) | 1975-09-17 | 1975-09-17 | PROCEDURE FOR CLEANING THE WATER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO763167L true NO763167L (en) | 1977-03-18 |
Family
ID=20325572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO763167A NO763167L (en) | 1975-09-17 | 1976-09-16 |
Country Status (6)
| Country | Link |
|---|---|
| DE (1) | DE2641718A1 (en) |
| ES (1) | ES451587A1 (en) |
| FI (1) | FI762658A (en) |
| GB (1) | GB1538101A (en) |
| NO (1) | NO763167L (en) |
| SE (1) | SE7510387L (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL185448C (en) * | 1980-03-07 | 1990-04-17 | Esmil Bv | DEVICE FOR FLOATING FLOCKED SLUDGE IN A LIQUID. |
| SE466197B (en) * | 1988-03-22 | 1992-01-13 | K Z Handels Ab | PROCEDURE AND DEVICE FOR BIOLOGICAL CLEANING STEPS OF WASTE WATER IN AIR-BASED BASED BEDS |
| CN112279434A (en) * | 2020-10-27 | 2021-01-29 | 东方铭科建设有限公司 | Water pollution multi-stage treatment and purification method |
| CN114057354A (en) * | 2021-11-09 | 2022-02-18 | 牧旺环境科技(杭州)有限公司 | Biological adsorption process and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1642399A1 (en) * | 1967-09-12 | 1971-05-06 | Dorr Oliver Inc | Process for wastewater treatment with removal of phosphorus |
-
1975
- 1975-09-17 SE SE7510387A patent/SE7510387L/en unknown
-
1976
- 1976-09-15 GB GB3814676A patent/GB1538101A/en not_active Expired
- 1976-09-16 FI FI762658A patent/FI762658A/fi not_active Application Discontinuation
- 1976-09-16 ES ES451587A patent/ES451587A1/en not_active Expired
- 1976-09-16 NO NO763167A patent/NO763167L/no unknown
- 1976-09-16 DE DE19762641718 patent/DE2641718A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE2641718A1 (en) | 1977-03-24 |
| ES451587A1 (en) | 1977-10-16 |
| SE7510387L (en) | 1977-03-18 |
| FI762658A (en) | 1977-03-18 |
| GB1538101A (en) | 1979-01-10 |
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