EP3359494A1 - Method for increased filtration efficiency - Google Patents
Method for increased filtration efficiencyInfo
- Publication number
- EP3359494A1 EP3359494A1 EP16784994.2A EP16784994A EP3359494A1 EP 3359494 A1 EP3359494 A1 EP 3359494A1 EP 16784994 A EP16784994 A EP 16784994A EP 3359494 A1 EP3359494 A1 EP 3359494A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- trati
- effi
- ncreased
- ency
- stati
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
Definitions
- the present appl i cati on di scl oses a met hod for i ncreased fi l trati on effi ci ency, whi ch can be appl i ed as exanrpl e i n water treatment pl ants and food i ndustry and any i ndustri al activi ty that requi res i ncreased fi l trati on effi ci ency.
- equi pment such as bel t fi l ters, fi l ter presses, centri fugal decanters, among others, can be used.
- the ai m i s to extract the most of the water contai ni ng fi l trate from the sl udge.
- the rel ease of the resi dual water can be obtai ned by gravi ty drai nage of sl udge on dryi ng beds or by mechani cal means.
- Dryi ng beds are fi l l ed wi th sand-gravel on whi ch the sl udge i s spread and l eft to drai n/evaporat e for a certai n ti me.
- si mpl e drai nage a max of 20% sol i d- i n water-sl udge can be achi eved.
- Ivechani cal dewateri ng can be achi eved by:
- Fi l ter press separati on process used to separate l i qui ds and sol i ds that uses the pri nci pl e of pressure drive, provi ded by a sl udge purrp.
- Vacuum f i I t er works on the pri nci pl e that i nsi de a drum rotati ng i n the sl udge i s created a vacuum) and consequentl y sl udge i s deposi ted on the drum surface and water i s sucked i nsi de.
- the sol i ds content i n the sl udge cake vari es wi th the type of sl udge, typi cal l y f rom 16-20% (for raw acti vated sl udge) to 32-40% (for wel l di gested pr i rrary si udge) .
- the document DE3144314A1 di scl oses a process for the treatment of sewage sl udge where the sai d sewage sl udge i s contacted wi th CCk- cont ai ni ng gases at el evated pressure and then abruptl y l et down.
- thi s document does not di scl ose the use of a stati c or dynami c mi xer to i ntroduce pure CQ2 or mi xtures of CQ2 before the f i l trati on.
- the document GB1088400A di scl oses a method of dewateri ng sl udge where the sewage sl udge i s dewatered i n a decanti ng centri f uge and l i me i s added to the centri f ugate i f not al ready present. Then, the mi xture i s treated wi th CQ2 unt i I pH i s be I ow 10. The resul t i ng I i qui d i s t hi ckened and the sol i ds fed back i nto the cycl e before or after the centri fuge.
- thi s document does not di scl ose the use of a stati c or dynarri c rrixer to i ntroduce pure CO2 or rrixtures of CQ2 before the fi l trati on.
- CQ2 or rrixtures of CQ2 are added to the fl ui d to be fi l tered, froma CQ2 regul ati on stati on;
- the rrixer used i n the method for i ncreased fi l trati on effi ci ency i s stati c.
- the rrixer used i n the method for i ncreased fi l trati on effi ci ency i s dynanri c.
- the CQ2 or rrixtures of CQ2 used i n the method for i ncreased fi l trati on effi ci ency are i n sol i d forrn i n l i qui d forrn gaseous form or rri x gas wi th I i qui d.
- the present appl i cati on al so di scl oses the use of the met hod for i ncreased fi l trati on effi ci ency i n water treatment pl ants and food i ndustry.
- the present appl i cati on descri bes a method for i ncreased fi l trati on effi ci ency, whi ch can be appl i ed as exanrpl e i n water treatment pl ants and food i ndustry and any i ndustri al activi ty that requi res i ncreased fi l trati on effi ci ency.
- pure CQ2 or rrixtures of CQ2 can be used before the dewateri ng step to i ncrease drai nage of i ntersti ti al water from the sl udge.
- the dewateri ng steps wi th the use of CO2 show a very i rrportant drai nage effect whi ch i ncreases the dewateri ng abi l i ty of the equi pment for mechani cal dewateri ng.
- Thi s CQ2 can come, for i nstance, froma tank or fromthe fl ue gases of a boi l er.
- the pure CQ2 or rrixtures of CQ2, ei ther i n gas or l i qui d or sol i d forrn can be added usi ng a stati c rrixer, a dynarri c rrixer or any other devi ce to make react the CQ2 wi th the fl ui d to be fi l tered " i n thi s way wi th the same dose of fl occul ant, preferably a polymer fl occul ant, and even more preferably a modi fi ed pol yacryl arri de, the fl ui d wi l l drai n more effi ci ently i n the mechani cal dewateri ng system and a hi gher content of sol i ds wi l l be obtai ned i n the dewatered
- i n sol i d forrn i n l i qui d forrn gaseous form or rri x gas with l i qui d are added to the fl ui d to be fi l tered from a CQ2 regul ati on stati on, whi ch can have a CQ2 dosi ng stati on;
- the CQ2 regul ati on stati on regul ates the fl ow of CQ2 among the steps of rrixture to have a certai n quanti ty of CQ2.
- Fi gure 2 Typi cal process l ayout for drai nage i ncrease wi th addi ti on of CQ2, where the reference nunrbers bel ong to:
- the present appl i cati on di scl oses a method for i ncreased fi l trati on effi ci ency conrpri si ng the fol l owi ng steps: CQ2 or rrixtures of CQ2 are added to the fl ui d to be fi l tered, froma CQ2 regul ati on stati on;
- the experi mental data tel l us that the curve for drai nage i ncrease wi th addi ti on of CO2, so wi th more quanti ty of CQ2, ei ther i n gas or l i qui d or sol i d forrn the drai nage wi l l al so i ncrease.
- W t h the method descri bed i n thi s appl i cati on, especi al ly wi th the use of a rrixer, there i s no need to i ncl ude so much CQ2 to obtai n a fl ui d that wi l l drai n more effi ci ently i n the mechani cal dewateri ng system and a hi gher content of sol i ds wi l l be obtai ned i n the dewatered fl ui d.
- the rrixture i s passed i n the rrixer ( 10) wi th a resi dence ti me l ower than 2 seconds, whi ch i s enough to i ncrease the transfer area between CQ2 and fl ui d i n somewhat between 10.000 to 1.000.000 ti mes and thus promote t he r eact i on bet ween t he CQ2 and the fl ui d to be fi l tered.
- the rrixture i s eval uated i n hi s pH (9) val ue to defi ne i f the CQ2 has been properly di ssolved.
- the preferred enrbodi nrent s descri bed above are obvi ously conrbi nabl e.
- the fol l owi ng dependent cl ai nrs defi ne further preferred enrbodi nrent s of the di scl osed technol ogy.
Landscapes
- Chemical & Material Sciences (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)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15398011.5A EP3127872A1 (en) | 2015-10-05 | 2015-08-05 | Method for increased filtration efficiency |
PCT/PT2016/050020 WO2017061885A1 (en) | 2015-10-05 | 2016-10-06 | Method for increased filtration efficiency |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3359494A1 true EP3359494A1 (en) | 2018-08-15 |
Family
ID=54360409
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15398011.5A Withdrawn EP3127872A1 (en) | 2015-10-05 | 2015-08-05 | Method for increased filtration efficiency |
EP16784994.2A Withdrawn EP3359494A1 (en) | 2015-10-05 | 2016-10-06 | Method for increased filtration efficiency |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15398011.5A Withdrawn EP3127872A1 (en) | 2015-10-05 | 2015-08-05 | Method for increased filtration efficiency |
Country Status (2)
Country | Link |
---|---|
EP (2) | EP3127872A1 (en) |
WO (1) | WO2017061885A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117164211B (en) * | 2023-11-03 | 2024-01-30 | 南京昆领自控有限公司 | Method for pretreating sludge by using liquid carbon dioxide |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1484838A1 (en) | 1964-02-04 | 1969-06-04 | Metallgesellschaft Ag | Process for the treatment of centrifugate, which falls during the dewatering of sewage sludge by means of decanting centrifuges |
DE3144314A1 (en) | 1981-11-07 | 1983-05-19 | Bayer Ag, 5090 Leverkusen | Process for improving the dewatering properties of sewage sludge |
EP3351512A3 (en) * | 2011-09-09 | 2018-10-17 | Sylvan Source, Inc. | Industrial water purification and desalination |
-
2015
- 2015-08-05 EP EP15398011.5A patent/EP3127872A1/en not_active Withdrawn
-
2016
- 2016-10-06 EP EP16784994.2A patent/EP3359494A1/en not_active Withdrawn
- 2016-10-06 WO PCT/PT2016/050020 patent/WO2017061885A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP3127872A1 (en) | 2017-02-08 |
WO2017061885A1 (en) | 2017-04-13 |
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