GB1341972A - Dewatering of sludges - Google Patents

Dewatering of sludges

Info

Publication number
GB1341972A
GB1341972A GB1341972DA GB1341972A GB 1341972 A GB1341972 A GB 1341972A GB 1341972D A GB1341972D A GB 1341972DA GB 1341972 A GB1341972 A GB 1341972A
Authority
GB
United Kingdom
Prior art keywords
methyl
sludges
copolymer
ethyl
repeating units
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.)
Expired
Application number
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of GB1341972A publication Critical patent/GB1341972A/en
Expired 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

Abstract

1341972 Treating sludges IMPERIAL CHEMICAL INDUSTRIES Ltd 29 April 1971 [8 May 1970] 22350/70 Heading C1C A method of dewatering sewage sludges comprises as a flocculating step, treating a sewage sludge with a copolymer in which from 99-20% by wt. of the repeating units are of the formula where R = hydrogen or methyl, R<SP>1</SP> = methyl or ethyl and R<SP>2</SP> and R<SP>3</SP> = methyl or ethyl or R<SP>2</SP> and R<SP>3</SP> taken together = CH 2 CH 2 OCH 2 CH 2 or -(CH 2 ) n - where n = 4, 5 or 6, A = alkylene radical having 2 or 3 C atoms, X- = monovalent anion (e.g. chloride, bromide or methosulphate), the remaining 1-80% by wt. of the repeating units being derived from styrene, substituted styrene or a non quaternary acrylic or methacrylic ester. The treated sludge may be subjected to vacuum or pressure filtration, floatation or centrifugation. The copolymer may be added in dry form or as an aqueous solution.
GB1341972D 1971-04-29 1971-04-29 Dewatering of sludges Expired GB1341972A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2235070 1971-04-29

Publications (1)

Publication Number Publication Date
GB1341972A true GB1341972A (en) 1973-12-25

Family

ID=10177984

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1341972D Expired GB1341972A (en) 1971-04-29 1971-04-29 Dewatering of sludges

Country Status (1)

Country Link
GB (1) GB1341972A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4465599A (en) * 1982-06-04 1984-08-14 Basf Aktiengesellschaft Flocculants based on polymers containing water-soluble dialkylaminoneopentyl (meth)acrylates
US4966712A (en) * 1987-05-22 1990-10-30 Nippon Shokubai Kagaku Kogyo Kabushiki Kaisha Flotation collector and method for treatment of inorganic substance-containing water system by use thereof
US5100561A (en) * 1990-06-06 1992-03-31 Betz Laboratories, Inc. Cationic polymers for sludge dewatering
US5183576A (en) * 1990-06-06 1993-02-02 Betz Laboratories, Inc. Cationic polymers for sludge dewatering
US5776362A (en) * 1992-07-04 1998-07-07 Kurita Water Industries Ltd. Sludge dehydrating agent

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4465599A (en) * 1982-06-04 1984-08-14 Basf Aktiengesellschaft Flocculants based on polymers containing water-soluble dialkylaminoneopentyl (meth)acrylates
US4966712A (en) * 1987-05-22 1990-10-30 Nippon Shokubai Kagaku Kogyo Kabushiki Kaisha Flotation collector and method for treatment of inorganic substance-containing water system by use thereof
US5100561A (en) * 1990-06-06 1992-03-31 Betz Laboratories, Inc. Cationic polymers for sludge dewatering
US5183576A (en) * 1990-06-06 1993-02-02 Betz Laboratories, Inc. Cationic polymers for sludge dewatering
US5776362A (en) * 1992-07-04 1998-07-07 Kurita Water Industries Ltd. Sludge dehydrating agent

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees