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WO1988000927A1 - Procede pour le traitement des eaux d'egout et autres eaux impures - Google Patents

Procede pour le traitement des eaux d'egout et autres eaux impures Download PDF

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Publication number
WO1988000927A1
WO1988000927A1 PCT/GB1987/000549 GB8700549W WO8800927A1 WO 1988000927 A1 WO1988000927 A1 WO 1988000927A1 GB 8700549 W GB8700549 W GB 8700549W WO 8800927 A1 WO8800927 A1 WO 8800927A1
Authority
WO
WIPO (PCT)
Prior art keywords
sewage
polymer
inorganic coagulant
cationic
anionic polymer
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.)
Ceased
Application number
PCT/GB1987/000549
Other languages
English (en)
Inventor
Noel Connaughton
Anton Pohoreski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Manufacturing and Sales Inc
Original Assignee
Continental Manufacturing and Sales Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Continental Manufacturing and Sales Inc filed Critical Continental Manufacturing and Sales Inc
Priority to KR1019880700324A priority Critical patent/KR910003150B1/ko
Priority to BR8707785A priority patent/BR8707785A/pt
Publication of WO1988000927A1 publication Critical patent/WO1988000927A1/fr
Priority to KR1019880700324A priority patent/KR880701687A/ko
Priority to DK166788A priority patent/DK170557B1/da
Priority to NO881414A priority patent/NO174416C/no
Priority to FI890533A priority patent/FI890533A7/fi
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • C02F1/52—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
    • 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
    • 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

Definitions

  • the present invention relates to a method for treating impure water, and more particularly to an improved method for treating sewage to produce treated effluent of very high quality.
  • Domestic or sanitary sewage and industrial wastes may be purified by the chemical precipitation process, in which suitable chemicals (e.g. aluminum sulfate, lime, iron chloride, polyelectrolytes or combinations thereof) are added to the sewage and the sewage passed to one or more flocculating tanks, normally equipped with slowly rotating agitators or paddles, in which colloidal solids are formed into particles of size and weight that will settle.
  • suitable chemicals e.g. aluminum sulfate, lime, iron chloride, polyelectrolytes or combinations thereof
  • the colloidal solids or floes are then separated from the liquid by being allowed to settle in subsequent settling tanks, whereafter the purified water is collected in a weir structure mounted at the surface of the water, while the sediment, consisting of floes and sludge, is removed, normally by means of sludge scrapers and/or pumps.
  • the prior art teaches the addition of various types of chemicals and combinations of chemicals to sewage and other impure water to remove various pollutants therefrom.
  • the invention when used to treat raw sewage or other impure water with very economical doses of three chemicals converts a very high proportion of the suspended, colloidal and dissolved pollutants in the sewage or other impure water to large, dense and stable floes which are so resistant to shear forces they can be settled out in a clarifier without the aid of inclined sedimentation means, and with an upward flow velocity of at least eighteen to twenty meters per hour. This flow rate is approximately ten times higher than than recommended by those skilled in the art for clarifiers without inclined sedimentation means.
  • Aluminum Removes all of the aluminum which is dosed into the sewage or industrial effluent, in addition to approximately 70% of the small quantity of aluminum present in the influent.
  • the invention is a considerable improvement over the prior art in relation to the removal of Biochemical Oxygen Demand (BOD,.), with approximately 95% of all BOD_ over 0.2 microns in size being removed, and in addition, almost one third of the BOD- less than 0.2 microns in size also being removed.
  • BOD Biochemical Oxygen Demand
  • the invention can be used in many locations to treat raw sewage to a standard that does not require further treatment before discharge to waterways, whereas the effluent from other chemical systems requires additional biological treatment. Furthermore, where highly polluting waste waters are treated in accordance with this invention and where the resulting treated effluent requires additional biological treatment the pollutional load on the subsequent biological system is reduced to a significant extent, thereby resulting in substantial cost savings.
  • Tests have indicated that raw sewage, after being treated using the methods described by this invention, and then passed directly through an ultraviolet disinfection apparatus, was efficiently disinfected and the resultant total coliform count was only 10 per 100 ml.
  • a very important advantage of this invention over the prior art is its versatility.
  • the invention can be used as either a Primary and/or Secondary and/or Tertiary Treatment system, and can be combined to advantage with other chemical, physical or biological processes.
  • Another important advantage of this invention is the overall speed with which the treatment process takes place. While the overall retention time required is site specific and depends on such factors as the quality of the influent and/or the quality of the effluent required, typically, for sewage treatment the overall retention time is less than thirty minutes .
  • the quality of the sludge produced by the us ⁇ e of this invention while being .site specific, is generally of a very high solids content and is readily thickened in a short period of time. The resulting thickened sludge is then readily dewatered to a high solids content cake. This is a very important aspect of this invention, and distinguishes this invention over the prior art in that the total volume of sludge to be disposed of is lower than usual, resulting in important economic and environmental advantages.
  • the invention provides a method for treating sewage or other impure water wherein the following three individual chemicals (but no more than two premixed together) are added to the sewage or other impure water in a mixing zone:
  • Predetermined amounts of three chemicals are added to sewage or other impure water.
  • Inorganic Coagulants i.e. aluminum sulphate, ferric chloride, Cationic Polymers, e.g. Polyelectrolytes, and Anionic Polymers, e.g. Polyelectrolytes are added to sewage or other impure water.
  • the three chemicals are intimately mixed with the sewage or other impure water in a mixing/flocculation zone to form large dense floes from the suspended, colloidal and dissolved pollutants in the sewage or other impure water, seoaratincr these floes from the sewa ⁇ e or impure water in a separating zone, drawing of treated effluent from the separating zone, and recycling a predetermind amount of sludge from the separating zone to the mixing/flocculation zone.
  • the dosages of chemicals, the sequence of addition, the specific chemicals used and the amount and location of sludge recycle are site specific and depend on design parameters such as:
  • An inorganic coagulant (A) and a cationic polymer (B) are mixed in the one container and then dosed into the sewage as a single mixture, intimately mixed with the sewage, and then anionic polymer (C) is dosed into the sewage.
  • An inorgaijic coagulant (A-) and an anionic polymer (C) are mixed in the one container and then dosed into the sewage as a single mixture, intimately mixed with the sewage, and then cationic polymer (B) is dosed into the sewage.
  • the amount of inorganic coagulant used is preferably 10 to 1000 ppm, more preferably 10 to 300 ppm, and most preferably 30 to 200 ppm.
  • the amount of each of the anionic polymer and the cationic polymer is preferably 0.1 to 50 ppm, and more preferably 0.1 to 10 ppm, and most preferably 0.1 to 5 ppm. All ppm are by weight in relation to the impure water to be treated.
  • a predetermined amount of the first chemical is dosed into the sewage or other impure water through one or more injection points at a first part of the mixing/flocculation zone and is intimately mixed with the said sewage or other impure water, then:
  • a predetermined amount of the second chemical is dosed into the sewage or other impure water through one or more injection points at a second part of the mixing/flocculation zone and is intimately mixed with the said sewage or other impure water, and then:
  • a predetermined amount of the third chemical is dosed into the sewage or other impure water through one or more injection points at a third part of the mixing/flocculation zone and is intimately mixed with the sewage or other impure water.
  • a predetermined amount of the sludge removed from the solids separating zone is recycled to the mixing/flocculation zone, and is dosed into and intimately mixed with the sewage or other impure water.
  • the location of the sludge recycle point in the mixing/flocculation zone and the quantity recycled is site specific and depends on the design parameters as previously described herein.
  • the sludge recycle rate can vary from 1-20% of the impure water flowrate, but is preferably at a flowrate of about 10%.
  • the sludge can be recycled to the incoming impure water at various locations, the best location being found by site trials.
  • the time interval between successive chemical doses can vary, e.g. from just a few seconds up to about 8 minutes, but generally a 5 minute interval or less has been found satisfactory.
  • the upward velocity in the sedimentation tank can vary, e.g. from 10-20 metres per hour.
  • an inorganic coagulant is mixed in one container with one of the polymers and then dosed into the sewage or impure water as one homogeneous mixture and then the other polymer is dosed into the sewage, the following general procedure is adpoted:
  • a predetermined amount of the inorganic coagulant and one of the polymers is mixed in one container and dosed as one homogeneous mixture into the sewage or other impure water through one or more injection points at a first part of the mixing/flocculation zone and is intimately mixed with the sewage or other impure water, and then
  • a predetermined amount of the other polymer i.e. of opposite charge to the polymer in.Step (i) above is dosed into the sewage or other impure water through one or more injection points of a second part of the mixing/flocculation zone and it is intimately mixed with the said sewage or other impure water.
  • a predetermined amount of the sludge removed from the separating zone is recycled to the mixing/flocculation zone and is dosed into and intimately mixed with the sewage or other impure water.
  • the location of the sludge recycle point in the mixing/flocculation zone and the quantity recycled is site specific and depends on the design parameters as previously described herein.
  • the time interval between the addition of the homogeneous mixture of the first two chemicals (i.e. an inorganic coagulant and a polymer) and the third chemical i.e. the polymer of opposite charge to that mixed with the inorganic coagulant in the mixing/flocculation zone is site specific and depends on the design parameters as previously described herein.
  • the process is suitable for treating sewage or other impure water without any further form of treatment, but in some instances, depending on the quality of the influent or the quality of the effluent required, it may be necessary to adjust the pH or the alkalinity of the influent or the effluent by the use of methods well known in the art.
  • inorganic coagulations can be used in the application of this invention, for example, aluminum sulphate, alum, and ferric chloride and lime.
  • the specific type of inorganic coagulant to be used is site specific and depends on the design parameters.
  • anionic polyelectrolytes may be used, and the following have been used with success:
  • One method for the treatment of sewage or other impure water is disclosed wherein three chemicals are added to the sewage in the following specific sequence to produce treated effluent.
  • An inorganic coagulant such as alum or ferric chloride is added to the sewage and is intimately mixed therewith to provide pretreated sewage; then an anionic polymer is added to the pretreated sewage and is intimately mixed therewith to provide and interim pretreated sewage: then a cationic polymer is added to the interim pretreated sewage and is intimately mixed therewith to provide chemically-treated sewage.
  • the chemically-treated sewage is supplied to [e.g] a separating zone wherein the chemically-treated effluent and sludge are separately removed. A predetermined amount of sludge is recycled back to the mixing/flocculation zone.
  • the anionic polymer is added to and intimately mixed in the sewage to provide pretreated sewage; then an inorganic coagulant, such as alum is added to and intimately mixed with the pretreated sewage to provide an interim pretreated sewage; cationic polymer is added to and intimately mixed with the interim pretreated sewage to provide chemically treated effluent.
  • the chemically treated efluent may be supplied to a separating zone wherein the chemically treated effluent and sludge are separately removed. A predetermined amount of sludge is recycled back to the mixing/flocculation zone.
  • high molecular weight cationic polymer is added to and intimately mixed with the sewage to provide pretreated sewage, then an inorganic coagulant such as alum is added to and intimately mixed with the pretreated sewage to provide an interim pretreated sewage; then anionic polymer is added to an intimately mixed with the interim pretreated sewage to provide chemically treated sewage. Then the chemically-treated sewage is supplied to a separating zone wherein chemically-treated effluent and sludge are separately removed. A predetermined amount of sludge is recycled back to the mixing/flocculation zone.
  • the inorganic coagulant e.g. alum or ferric chloride
  • the cationic polymer is mixed in the one container with the cationic polymer to form a homogeneous mixture which is then added and intimately mixed with the sewage to provide an interim pretreated sewage; then at a later time an anionic polymer is added and intimately mixed with the interium pretreated sewage to provide chemically-treated sewage.
  • the chemically-treated sewage is supplied to a separating zone wherein the chemically treated effluent and sludge are separately removed. A predetermined amount of sludge is recycled back to the mixing/flocculation zone.
  • the inorganic coagulant e.g. alum or ferric chloride
  • the anionic polymer is mixed in the one container with the anionic polymer to form a homogeneous mixture which is then added and intimately mixed with the sewage to provide an interim pretreated sewage; then at a later time a cationic polymer is added and intimately mixed with the interim pretreated sewage to provide chemically treated sewage.
  • the chemically treated sewage is supplied to, a separating zone wherein the chemically treated effluent and sludge are separately removed. A predetermined amount of sludge is recycled back to the mixing/flocculation zone.
  • the amount of predetermined sludge recycled back in the process is typically of the order of 1 to 10%, although rates of 20% or more can be used. This percentage may vary depending on the quality of the influent and the desired effluent quality. It may be recycled to the influent or various locations, the best location being found by site trials.
  • Table 1 sets out the results of numerous tests carried out on a mixture of sewage and industrial effluent, using an inorganic coagulant (alum) , followed by an anionic polyelectrolyte, followed by a cationic polyelectrolyte.
  • alum inorganic coagulant
  • anionic polyelectrolyte followed by a cationic polyelectrolyte.
  • the method also results in a very high level of microorganism removal.
  • a sample of raw sewage was found to have a total eoliform bacteria count of over 1,800,000 per lOOmls, and the treated effluent produced by the method of this invention had a eoliform count of only 5500 per lOOmls, representing a removal efficiency of over 99.7%.

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)
  • Inorganic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

Le procédé décrit consiste à ajouter aux eaux d'égout ou autres eaux impures dans une zone de mélange les constituants suivants, individuellement mais sans en prémélanger plus de deux: (a) un coagulant inorganique, (b) un polymère anionique, et (c) un polymère cationique, en mélangeant intimement les produits chimiques ajoutés avec les eaux d'égout ou autres eaux impures, à condition que (d) le coagulant inorganique, seul ou avec le polymère anionique ou le polymère cationique ne soit ajouté en dernier; et (e) que le polymère anionique et le polymère cationique ne soient prémélangés et ajoutés ensemble. On obtient des effluents chimiquement traités contenant des flocons de grandes dimensions, compacts, fermement liés, notablement résistants au cisaillement et rapidement séparables. Ces flocons sont séparés du liquide dans une zone de séparation. Les effluents traités sont ensuite éliminés de la zone de séparation. Une quantité prédéterminée d'effluent traité est ensuite recyclée, par exemple vers la zone de mélange, ou un autre endroit déterminé par des essais sur site.
PCT/GB1987/000549 1986-08-04 1987-08-03 Procede pour le traitement des eaux d'egout et autres eaux impures Ceased WO1988000927A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1019880700324A KR910003150B1 (ko) 1986-08-04 1987-08-03 하수 및 타 불순물 포함수를 처리하는 방법
BR8707785A BR8707785A (pt) 1986-08-04 1987-08-03 Processo para tratamento de aguas sevidas ou outras aguas impuras
KR1019880700324A KR880701687A (ko) 1986-08-04 1988-03-24 하수 및 타불순물 포함수를 처리하는 방법
DK166788A DK170557B1 (da) 1986-08-04 1988-03-25 Fremgangsmåde til behandling af spildevand og andet urent vand ved flokkulering
NO881414A NO174416C (no) 1986-08-04 1988-03-29 Fremgangsmåte for behandling av spillvann og annet urent vann
FI890533A FI890533A7 (fi) 1986-08-04 1989-02-03 Foerfarande foer behandling av avloppsvatten och annat orent vatten.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US89283186A 1986-08-04 1986-08-04
US892,831 1986-08-04
IE113387 1987-05-07
IE113487 1987-05-07
IE1134/87 1987-05-07
IE1133/87 1987-05-07

Publications (1)

Publication Number Publication Date
WO1988000927A1 true WO1988000927A1 (fr) 1988-02-11

Family

ID=27270355

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1987/000549 Ceased WO1988000927A1 (fr) 1986-08-04 1987-08-03 Procede pour le traitement des eaux d'egout et autres eaux impures

Country Status (13)

Country Link
EP (1) EP0316348A1 (fr)
JP (1) JPH02500724A (fr)
KR (1) KR880701687A (fr)
AU (1) AU621032B2 (fr)
BR (1) BR8707785A (fr)
CA (1) CA1334543C (fr)
DK (1) DK170557B1 (fr)
ES (1) ES2004466A6 (fr)
FI (1) FI890533A7 (fr)
GR (1) GR871232B (fr)
NO (1) NO174416C (fr)
PT (1) PT85484B (fr)
WO (1) WO1988000927A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991007354A1 (fr) * 1989-11-15 1991-05-30 Irving Ainsworth (Holdings) Limited Procede de traitement des eaux
WO2000027759A3 (fr) * 1998-11-07 2000-11-30 Procter & Gamble Procede et composition permettant de recycler l'eau
US6805803B1 (en) 1999-07-19 2004-10-19 Ciba Specialty Chemicals Water Treatments Ltd. Process for flocculating suspensions
EP2252404B1 (fr) 2008-02-14 2018-12-05 Soane Mining LLC Systèmes et procédés permettant d'éliminer une matière particulaire finement dispersée d'un flux de liquide
US10562799B2 (en) 2008-02-14 2020-02-18 Soane Mining, Llc Systems and methods for removing finely dispersed particulate matter from a fluid stream

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2051223B1 (es) * 1992-06-24 1994-12-16 Titan Ind Sa Procedimiento de depuracion y recuperacion de aguas de limpieza en el proceso de fabricacion de pinturas de dispersion acuosa.
JP6644607B2 (ja) * 2016-03-30 2020-02-12 住友重機械エンバイロメント株式会社 排水処理システム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0003327A2 (fr) * 1978-01-18 1979-08-08 Passavant-Werke Ag Procédé pour le traitement et/ou l'épuration chimique et mécanique des eaux souterraines, des eaux de surface ou des eaux d'égout
US4173532A (en) * 1974-03-07 1979-11-06 Entenmann's, Inc. Method for treating plant effluent
US4569768A (en) * 1983-10-07 1986-02-11 The Dow Chemical Company Flocculation of suspended solids from aqueous media
WO1986004585A1 (fr) * 1985-01-31 1986-08-14 Sulzer-Escher Wyss Gmbh Procede et systeme pour la floculation de substances floculables dans des suspensions en particulier pour l'epuration des eaux de rejet d'installations de desencrage

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5473464A (en) * 1977-11-22 1979-06-12 Ebara Infilco Co Ltd Treatment of waste water
JPS6028894A (ja) * 1983-07-26 1985-02-14 Kurita Water Ind Ltd し尿の処理方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173532A (en) * 1974-03-07 1979-11-06 Entenmann's, Inc. Method for treating plant effluent
EP0003327A2 (fr) * 1978-01-18 1979-08-08 Passavant-Werke Ag Procédé pour le traitement et/ou l'épuration chimique et mécanique des eaux souterraines, des eaux de surface ou des eaux d'égout
US4569768A (en) * 1983-10-07 1986-02-11 The Dow Chemical Company Flocculation of suspended solids from aqueous media
WO1986004585A1 (fr) * 1985-01-31 1986-08-14 Sulzer-Escher Wyss Gmbh Procede et systeme pour la floculation de substances floculables dans des suspensions en particulier pour l'epuration des eaux de rejet d'installations de desencrage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991007354A1 (fr) * 1989-11-15 1991-05-30 Irving Ainsworth (Holdings) Limited Procede de traitement des eaux
WO2000027759A3 (fr) * 1998-11-07 2000-11-30 Procter & Gamble Procede et composition permettant de recycler l'eau
US6805803B1 (en) 1999-07-19 2004-10-19 Ciba Specialty Chemicals Water Treatments Ltd. Process for flocculating suspensions
EP2252404B1 (fr) 2008-02-14 2018-12-05 Soane Mining LLC Systèmes et procédés permettant d'éliminer une matière particulaire finement dispersée d'un flux de liquide
US10562799B2 (en) 2008-02-14 2020-02-18 Soane Mining, Llc Systems and methods for removing finely dispersed particulate matter from a fluid stream
US10570037B2 (en) 2008-02-14 2020-02-25 Soane Mining, Llc Systems and methods for removing finely dispersed particulate matter from a fluid stream

Also Published As

Publication number Publication date
GR871232B (en) 1988-02-18
CA1334543C (fr) 1995-02-21
NO881414L (no) 1988-03-29
JPH02500724A (ja) 1990-03-15
DK166788A (da) 1988-03-25
PT85484A (en) 1987-09-01
PT85484B (pt) 1990-06-29
NO174416C (no) 1994-05-04
FI890533A0 (fi) 1989-02-03
NO174416B (no) 1994-01-24
AU621032B2 (en) 1992-03-05
AU7755787A (en) 1988-02-24
BR8707785A (pt) 1989-08-15
DK166788D0 (da) 1988-03-25
KR880701687A (ko) 1988-11-04
ES2004466A6 (es) 1989-01-01
EP0316348A1 (fr) 1989-05-24
FI890533A7 (fi) 1989-02-03
NO881414D0 (no) 1988-03-29
DK170557B1 (da) 1995-10-23

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