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1. (WO1991007354) WATER TREATMENT METHOD
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/007354 International Application No.: PCT/GB1989/001351
Publication Date: 30.05.1991 International Filing Date: 15.11.1989
Chapter 2 Demand Filed: 13.06.1991
IPC:
C02F 1/20 (2006.01) ,C02F 1/28 (2006.01) ,C02F 1/44 (2006.01) ,C02F 1/52 (2006.01) ,C02F 1/54 (2006.01) ,C02F 1/58 (2006.01) ,C02F 1/62 (2006.01) ,C02F 3/12 (2006.01) ,C02F 9/00 (2006.01)
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
20
by degassing, i.e. liberation of dissolved gases
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
28
by sorption
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
44
by dialysis, osmosis or reverse osmosis
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
52
by flocculation or precipitation of suspended impurities
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
52
by flocculation or precipitation of suspended impurities
54
using organic material
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
58
by removing specified dissolved compounds
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
58
by removing specified dissolved compounds
62
Heavy metal compounds
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
3
Biological treatment of water, waste water, or sewage
02
Aerobic processes
12
Activated sludge processes
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
9
Multistep treatment of water, waste water or sewage
Applicants:
IRVING AINSWORTH (HOLDINGS) LIMITED [GB/GB]; Britannia Mills Gelderd Road Birstall, Batley West Yorkshire WF17 9QD, GB (AllExceptUS)
TIMMONS, Alban [GB/GB]; GB (UsOnly)
Inventors:
TIMMONS, Alban; GB
Agent:
BAILEY, WALSH & CO.; 5 York Place Leeds LS1 2SD, GB
Priority Data:
Title (EN) WATER TREATMENT METHOD
(FR) PROCEDE DE TRAITEMENT DES EAUX
Abstract:
(EN) The invention provides a method for the purification of contaminated water such as leachate from a land fill site. The treatment involves the application to the water of anionic and cationic coagulents at different stages, and between the application of the coagulents precipitation agents are added to precipitate the contaminants which typically are metal ions in solution. The coagulants are polyelectrolytes which in the case of the first added coagulant cause formation of a floc and the addition of the second coagulant causes heavy deposition of contaminants. Separation follows and the separated solids are passed to a sludge thickening tank whilst the separated liquid which is of high pH is stripped of ammonia and other nitrogenous compounds. The pH is subsequently reduced to zero and subsequently the carbon dioxide is removed. The remaining liquid can either be subjected to a bio-oxidation treatment or filtered by reverse osmosis in the latter case to provide clean water which can be returned to a stream or river. The invention also provides a novel form of stripping of ammonia and carbon dioxide and a vessel for use in the same.
(FR) Procédé d'épuration de l'eau contaminée telle que l'eau de lessivage provenant d'une décharge publique. Le traitement consiste à appliquer à l'eau des coagulants anioniques et cationiques à des étapes différentes, et à ajouter, entre l'application des coagulants, des précipitants afin de précipiter les contaminants qui sont normalement des ions métalliques en solution. Les coagulants sont des polyélectrolytes qui, dans le cas du premier coagulant ajouté, provoquent la formation d'une floculation, l'addition du deuxième coagulant provoquant un important dépôt de contaminants. Vient ensuite la séparation, et les solides séparés passent dans un réservoir d'épaississage des boues tandis que l'ammoniac et d'autres composés azotés sont éliminés par stripping du liquide séparé, qui a un pH élevé. Le pH est ensuite réduit à zéro puis le dioxyde de carbone est enlevé. Le liquide restant peut être soumis à un traitement d'oxydation ou à la filtration par osmose inverse. Dans ce dernier cas le but est d'obtenir de l'eau épurée qui peut être remise dans un ruisseau ou un fleuve. On décrit également un nouveau procédé de stripage d'ammoniac et de dioxyde de carbone, ainsi qu'un récipient destiné à être utilisé à cette fin.
Designated States: AU, BB, BG, BR, DK, FI, HU, JP, KP, KR, LK, MC, MG, MW, NO, RO, SD, SU, US
European Patent Office (AT, BE, CH, DE, FR, GB, IT, LU, NL, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CM, GA, ML, MR, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
AU1989045094