CA1085762A - Procede de broyage permettant de reduire les besoins de floculation pour la destabilisation des eaux residuaires dans le traitement des sables bitumineux - Google Patents

Procede de broyage permettant de reduire les besoins de floculation pour la destabilisation des eaux residuaires dans le traitement des sables bitumineux

Info

Publication number: CA1085762A
Authority: CA; Canada
Prior art keywords: layer; sludge; grinding; water; mixture
Prior art date: 1977-03-31
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.): Expired

Application number

CA275,213A

Other languages

English (en)

Inventor

Raymond N. Yong

Anar S. Baweja

B. Peter Warkentin

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.)

Suncor Energy Inc

Original Assignee

Suncor 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.)

1977-03-31

Filing date

1977-03-31

Publication date

1980-09-16

1977-03-31 Application filed by Suncor Inc filed Critical Suncor Inc

1977-03-31 Priority to CA275,213A priority Critical patent/CA1085762A/fr

1980-09-16 Application granted granted Critical

1980-09-16 Publication of CA1085762A publication Critical patent/CA1085762A/fr

Status Expired legal-status Critical Current

Links

239000010802 sludge Substances 0.000 title claims abstract description 40
238000000227 grinding Methods 0.000 title claims abstract description 37
230000000368 destabilizing effect Effects 0.000 title abstract 2
238000000034 method Methods 0.000 claims abstract description 55
230000008569 process Effects 0.000 claims abstract description 48
229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 13
239000011707 mineral Substances 0.000 claims abstract description 13
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 55
239000004576 sand Substances 0.000 claims description 35
239000002245 particle Substances 0.000 claims description 29
239000004927 clay Substances 0.000 claims description 26
239000000203 mixture Substances 0.000 claims description 19
238000000926 separation method Methods 0.000 claims description 19
239000007787 solid Substances 0.000 claims description 14
239000003153 chemical reaction reagent Substances 0.000 claims description 10
230000003311 flocculating effect Effects 0.000 claims description 8
230000000694 effects Effects 0.000 claims description 4
239000003921 oil Substances 0.000 claims 12
238000007599 discharging Methods 0.000 claims 2
238000005189 flocculation Methods 0.000 abstract description 13
230000016615 flocculation Effects 0.000 abstract description 13
239000008394 flocculating agent Substances 0.000 abstract description 8
239000000725 suspension Substances 0.000 abstract description 8
238000005119 centrifugation Methods 0.000 abstract description 4
238000001238 wet grinding Methods 0.000 abstract description 3
239000000470 constituent Substances 0.000 abstract description 2
238000004062 sedimentation Methods 0.000 abstract 1
239000010426 asphalt Substances 0.000 description 25
239000011269 tar Substances 0.000 description 22
239000000463 material Substances 0.000 description 15
238000009825 accumulation Methods 0.000 description 7
235000010755 mineral Nutrition 0.000 description 7
239000011275 tar sand Substances 0.000 description 7
230000003750 conditioning effect Effects 0.000 description 6
229920000642 polymer Polymers 0.000 description 6
238000011084 recovery Methods 0.000 description 6
NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 5
238000000605 extraction Methods 0.000 description 5
238000005188 flotation Methods 0.000 description 5
239000007788 liquid Substances 0.000 description 5
238000012545 processing Methods 0.000 description 5
239000002516 radical scavenger Substances 0.000 description 4
239000002002 slurry Substances 0.000 description 4
238000003809 water extraction Methods 0.000 description 4
SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
238000007792 addition Methods 0.000 description 3
238000005056 compaction Methods 0.000 description 3
230000001143 conditioned effect Effects 0.000 description 3
230000007774 longterm Effects 0.000 description 3
229920002401 polyacrylamide Polymers 0.000 description 3
230000002000 scavenging effect Effects 0.000 description 3
238000012360 testing method Methods 0.000 description 3
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
230000015572 biosynthetic process Effects 0.000 description 2
239000011575 calcium Substances 0.000 description 2
229960005069 calcium Drugs 0.000 description 2
229910052791 calcium Inorganic materials 0.000 description 2
ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
235000013339 cereals Nutrition 0.000 description 2
238000003776 cleavage reaction Methods 0.000 description 2
239000000084 colloidal system Substances 0.000 description 2
239000013078 crystal Substances 0.000 description 2
230000007423 decrease Effects 0.000 description 2
150000002148 esters Chemical class 0.000 description 2
230000005484 gravity Effects 0.000 description 2
229910052739 hydrogen Inorganic materials 0.000 description 2
239000001257 hydrogen Substances 0.000 description 2
230000001965 increasing effect Effects 0.000 description 2
238000002156 mixing Methods 0.000 description 2
239000003208 petroleum Substances 0.000 description 2
229920000136 polysorbate Polymers 0.000 description 2
230000007017 scission Effects 0.000 description 2
-1 silt Substances 0.000 description 2
SFUUDZYXHNYCTM-UHFFFAOYSA-N 2-methylprop-2-enamide;prop-2-enamide Chemical class NC(=O)C=C.CC(=C)C(N)=O SFUUDZYXHNYCTM-UHFFFAOYSA-N 0.000 description 1
HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
238000012935 Averaging Methods 0.000 description 1
UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
241000237074 Centris Species 0.000 description 1
KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
XDXHAEQXIBQUEZ-UHFFFAOYSA-N Ropinirole hydrochloride Chemical compound Cl.CCCN(CCC)CCC1=CC=CC2=C1CC(=O)N2 XDXHAEQXIBQUEZ-UHFFFAOYSA-N 0.000 description 1
239000002253 acid Substances 0.000 description 1
150000001252 acrylic acid derivatives Chemical class 0.000 description 1
238000013019 agitation Methods 0.000 description 1
229910052783 alkali metal Inorganic materials 0.000 description 1
150000001340 alkali metals Chemical class 0.000 description 1
125000003368 amide group Chemical group 0.000 description 1
150000003863 ammonium salts Chemical class 0.000 description 1
125000000129 anionic group Chemical group 0.000 description 1
239000011283 bituminous tar Substances 0.000 description 1
235000001465 calcium Nutrition 0.000 description 1
239000001110 calcium chloride Substances 0.000 description 1
229910001628 calcium chloride Inorganic materials 0.000 description 1
FNAQSUUGMSOBHW-UHFFFAOYSA-H calcium citrate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O FNAQSUUGMSOBHW-UHFFFAOYSA-H 0.000 description 1
239000001354 calcium citrate Substances 0.000 description 1
229960004256 calcium citrate Drugs 0.000 description 1
AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 description 1
239000000920 calcium hydroxide Substances 0.000 description 1
229910001861 calcium hydroxide Inorganic materials 0.000 description 1
MKJXYGKVIBWPFZ-UHFFFAOYSA-L calcium lactate Chemical compound [Ca+2].CC(O)C([O-])=O.CC(O)C([O-])=O MKJXYGKVIBWPFZ-UHFFFAOYSA-L 0.000 description 1
239000001527 calcium lactate Substances 0.000 description 1
229960002401 calcium lactate Drugs 0.000 description 1
235000011086 calcium lactate Nutrition 0.000 description 1
BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
239000000292 calcium oxide Substances 0.000 description 1
ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
229910000389 calcium phosphate Inorganic materials 0.000 description 1
159000000007 calcium salts Chemical class 0.000 description 1
235000011132 calcium sulphate Nutrition 0.000 description 1
GUPPESBEIQALOS-UHFFFAOYSA-L calcium tartrate Chemical compound [Ca+2].[O-]C(=O)C(O)C(O)C([O-])=O GUPPESBEIQALOS-UHFFFAOYSA-L 0.000 description 1
239000001427 calcium tartrate Substances 0.000 description 1
235000011035 calcium tartrate Nutrition 0.000 description 1
150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
125000002091 cationic group Chemical group 0.000 description 1
229920006317 cationic polymer Polymers 0.000 description 1
239000003518 caustics Substances 0.000 description 1
238000006243 chemical reaction Methods 0.000 description 1
239000003795 chemical substances by application Substances 0.000 description 1
239000002734 clay mineral Substances 0.000 description 1
239000011248 coating agent Substances 0.000 description 1
238000000576 coating method Methods 0.000 description 1
230000001427 coherent effect Effects 0.000 description 1
229940000425 combination drug Drugs 0.000 description 1
230000000052 comparative effect Effects 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
229920001577 copolymer Polymers 0.000 description 1
230000001186 cumulative effect Effects 0.000 description 1
238000013461 design Methods 0.000 description 1
238000007865 diluting Methods 0.000 description 1
239000006185 dispersion Substances 0.000 description 1
238000011143 downstream manufacturing Methods 0.000 description 1
230000002708 enhancing effect Effects 0.000 description 1
229940071106 ethylenediaminetetraacetate Drugs 0.000 description 1
239000010419 fine particle Substances 0.000 description 1
235000013312 flour Nutrition 0.000 description 1
239000012530 fluid Substances 0.000 description 1
239000013505 freshwater Substances 0.000 description 1
238000010438 heat treatment Methods 0.000 description 1
229920006158 high molecular weight polymer Polymers 0.000 description 1
125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
229920000831 ionic polymer Polymers 0.000 description 1
150000002500 ions Chemical class 0.000 description 1
230000007246 mechanism Effects 0.000 description 1
229910000000 metal hydroxide Inorganic materials 0.000 description 1
150000004692 metal hydroxides Chemical class 0.000 description 1
FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical class CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
125000005395 methacrylic acid group Chemical class 0.000 description 1
238000005065 mining Methods 0.000 description 1
238000012986 modification Methods 0.000 description 1
230000004048 modification Effects 0.000 description 1
235000019691 monocalcium phosphate Nutrition 0.000 description 1
230000007935 neutral effect Effects 0.000 description 1
238000006386 neutralization reaction Methods 0.000 description 1
229920000233 poly(alkylene oxides) Polymers 0.000 description 1
229920000867 polyelectrolyte Polymers 0.000 description 1
238000001556 precipitation Methods 0.000 description 1
230000009257 reactivity Effects 0.000 description 1
230000000284 resting effect Effects 0.000 description 1
239000011435 rock Substances 0.000 description 1
150000003839 salts Chemical class 0.000 description 1
239000003352 sequestering agent Substances 0.000 description 1
239000002904 solvent Substances 0.000 description 1
238000001179 sorption measurement Methods 0.000 description 1
241000894007 species Species 0.000 description 1
238000013517 stratification Methods 0.000 description 1
BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
238000010998 test method Methods 0.000 description 1
235000013337 tricalcium citrate Nutrition 0.000 description 1
238000010977 unit operation Methods 0.000 description 1

Classifications

- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/04—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by extraction
- C10G1/047—Hot water or cold water extraction processes
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/047—Breaking emulsions with separation aids
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/007—Working-up pitch, asphalt, bitumen winning and separation of asphalt from mixtures with aggregates, fillers and other products, e.g. winning from natural asphalt and regeneration of waste asphalt

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Chemical Kinetics & Catalysis (AREA)
Oil, Petroleum & Natural Gas (AREA)
Organic Chemistry (AREA)
General Chemical & Material Sciences (AREA)
Physics & Mathematics (AREA)
Thermal Sciences (AREA)
Structural Engineering (AREA)
Materials Engineering (AREA)
Civil Engineering (AREA)
Analytical Chemistry (AREA)
Life Sciences & Earth Sciences (AREA)
Wood Science & Technology (AREA)
Separation Of Suspended Particles By Flocculating Agents (AREA)

CA275,213A 1977-03-31 1977-03-31 Procede de broyage permettant de reduire les besoins de floculation pour la destabilisation des eaux residuaires dans le traitement des sables bitumineux Expired CA1085762A (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
CA275,213A CA1085762A (fr)	1977-03-31	1977-03-31	Procede de broyage permettant de reduire les besoins de floculation pour la destabilisation des eaux residuaires dans le traitement des sables bitumineux

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
CA275,213A CA1085762A (fr)	1977-03-31	1977-03-31	Procede de broyage permettant de reduire les besoins de floculation pour la destabilisation des eaux residuaires dans le traitement des sables bitumineux

Publications (1)

Publication Number	Publication Date
CA1085762A true CA1085762A (fr)	1980-09-16

Family

ID=4108284

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA275,213A Expired CA1085762A (fr)	1977-03-31	1977-03-31	Procede de broyage permettant de reduire les besoins de floculation pour la destabilisation des eaux residuaires dans le traitement des sables bitumineux

Country Status (1)

Country	Link
CA (1)	CA1085762A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2490104A1 (fr) *	1980-09-15	1982-03-19	Petrolite Corp	Recuperation d'hydrocarbures a partir de residus de queue aqueux
US7677397B2 (en)	2004-07-30	2010-03-16	Suncor Energy Inc.	Sizing roller screen ore processing apparatus
US8328126B2 (en)	2008-09-18	2012-12-11	Suncor Energy, Inc.	Method and apparatus for processing an ore feed
US8393561B2 (en)	2005-11-09	2013-03-12	Suncor Energy Inc.	Method and apparatus for creating a slurry
US9068776B2 (en)	2009-10-30	2015-06-30	Suncor Energy Inc.	Depositing and farming methods for drying oil sand mature fine tailings
US9404686B2 (en)	2009-09-15	2016-08-02	Suncor Energy Inc.	Process for dying oil sand mature fine tailings
US9909070B2 (en)	2009-09-15	2018-03-06	Suncor Energy Inc.	Process for flocculating and dewatering oil sand mature fine tailings

1977
- 1977-03-31 CA CA275,213A patent/CA1085762A/fr not_active Expired

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2490104A1 (fr) *	1980-09-15	1982-03-19	Petrolite Corp	Recuperation d'hydrocarbures a partir de residus de queue aqueux
US7677397B2 (en)	2004-07-30	2010-03-16	Suncor Energy Inc.	Sizing roller screen ore processing apparatus
US8136672B2 (en)	2004-07-30	2012-03-20	Suncor Energy, Inc.	Sizing roller screen ore processing apparatus
US8851293B2 (en)	2004-07-30	2014-10-07	Suncor Energy, Inc.	Sizing roller screen ore processing apparatus
US8393561B2 (en)	2005-11-09	2013-03-12	Suncor Energy Inc.	Method and apparatus for creating a slurry
US8328126B2 (en)	2008-09-18	2012-12-11	Suncor Energy, Inc.	Method and apparatus for processing an ore feed
US8622326B2 (en)	2008-09-18	2014-01-07	Suncor Energy, Inc.	Method and apparatus for processing an ore feed
US9404686B2 (en)	2009-09-15	2016-08-02	Suncor Energy Inc.	Process for dying oil sand mature fine tailings
US9909070B2 (en)	2009-09-15	2018-03-06	Suncor Energy Inc.	Process for flocculating and dewatering oil sand mature fine tailings
US10590347B2 (en)	2009-09-15	2020-03-17	Suncor Energy Inc.	Process for flocculating and dewatering oil sand mature fine tailings
US9068776B2 (en)	2009-10-30	2015-06-30	Suncor Energy Inc.	Depositing and farming methods for drying oil sand mature fine tailings

Legal Events

Date	Code	Title	Description
1997-09-16	MKEX	Expiry

Publication	Publication Date	Title
US4330409A (en)	1982-05-18	Destabilization of sludge with hydrolyzed starch flocculants
US3487003A (en)	1969-12-30	Removal of clay from the water streams of the hot water process by flocculation
US5626743A (en)	1997-05-06	Tar sands extraction process
US4414117A (en)	1983-11-08	Decarbonation of tailings sludge to improve settling
US5985138A (en)	1999-11-16	Tar sands extraction process
US4399039A (en)	1983-08-16	Treatment of tailings pond sludge
CA2707197C (fr)	2012-07-10	Systeme et procede de traitement de produits de queue
US3856668A (en)	1974-12-24	Method for treatment of coal washery waters
US4406793A (en)	1983-09-27	Use of free bodies to increase size of dispersed phase particles
CA1146898A (fr)	1983-05-24	Separation du bitume en presence dans les bouillies de sable bitumineux par traitement secondaire a l'eau
US4437998A (en)	1984-03-20	Method for treating oil sands extraction plant tailings
US3931006A (en)	1976-01-06	Method of reducing sludge accumulation from tar sands hot water process
CA2168808C (fr)	2000-10-31	Procede d'extraction de sables bitumineux
US3751358A (en)	1973-08-07	Freeze-thaw separation of solids from tar sands extraction effluents
US4456533A (en)	1984-06-26	Recovery of bitumen from bituminous oil-in-water emulsions
CA1121555A (fr)	1982-04-13	Destabilisation des boues au moyen de floculants a base d'amidon hydrolyse
US3953318A (en)	1976-04-27	Method of reducing sludge accumulation from tar sands hot water process
US5492628A (en)	1996-02-20	Process for reducing sludge accumulation in the hot water extraction process for oil sands
CA1109408A (fr)	1981-09-22	Destabilisation et amelioration du degre de permeabilite et de la resistance a la separation des boues traitees en floculant a base d'amidon hydrolise et au ciment portland
GB2061907A (en)	1981-05-20	Method of dewatering the sludge layer of an industrial process tailings pond
CA1110950A (fr)	1981-10-20	Destabilisation de la boue par des floculants a base d'amidon hydrolyse
Hupka et al.	1991	Moderate-temperature water-based bitumen recovery from tar sand
US4399038A (en)	1983-08-16	Method for dewatering the sludge layer of an industrial process tailings pond
US4401552A (en)	1983-08-30	Beneficiation of froth obtained from tar sands sludge
CA1123309A (fr)	1982-05-11	Destabilisation des boues a l'aide de floculants d'amidon hydrolyse