PRETREATMENT CONSIDERATIONS FOR DISSOLVED AIR FLOTATION - WATER TYPE, COAGULANTS AND FLOCCULATION

被引：2

作者：

BUNKER, DQ

EDZWALD, JK

DAHLQUIST, J

GILLBERG, L

机构：

[1] UNIV MASSACHUSETTS,DEPT CIVIL & ENVIRONM ENGN,AMHERST,MA 01003

[2] PURAC AB,S-22105 LUND,SWEDEN

[3] KEMIRA KEMI AB,S-25109 HELSINGBORG,SWEDEN

来源：

WATER SCIENCE AND TECHNOLOGY | 1995年 / 31卷 / 3-4期

关键词：

COAGULATION; DISSOLVED AIR FLOTATION; DRINKING WATER; FLOCCULATION; POLYALUMINIUM CHLORIDE;

D O I：

10.2166/wst.1995.0517

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Pretreatment considerations of coagulant selection, flocculation time and flocculation mixing intensity were studied for two different water supply types, aquatic humic and non-aquatic humic waters of low turbidity. Alum, ferric salts, and various polyaluminium chlorides (PACs) with different chemical properties were all effective in dissolved air flotation (DAF) when used under favorable conditions of dosage, pH, and flocculation time. A stoichiometry was found for the aluminium coagulants between coagulant dose and raw water DOC. Si and sulfate PACs were effective in treating cold waters with short flocculation times of 2.5 to 5 minutes. Flotation performance improved slightly with increasing flocculation mixing intensity. The results suggest that flocculation tanks be designed to produce strong, ''pinpoint'' size flee particles.

引用

页码：63 / 71

页数：9

共 14 条

[1]

Dempsey B. A., 1983, Aquatic and terrestrial humic materials, P239

[2]

Edzwald J. K., 1990, CHEM WATER WASTEWATE, P341, DOI [10.1007/978-3-642-76093-8_22, DOI 10.1007/978-3-642-76093-8, DOI 10.1007/978-3-642-76093-8_22]

[3]

EDZWALD JK, 1992, J AM WATER WORKS ASS, V84, P92

[4]

EDZWALD JK, 1992, PARTICULATE REMOVAL

[5]

EDZWALD JK, 1990, WATER SUPPLY JONKOPI, V8, P141

[6]

EDZWALD JK, 1989, US EPA600S289032 FIN

[7]

HEINANEN J, 1988, Aqua Fennica, V18, P113

[8]

HEINANEN J, 1992, CHEM WATER WASTEWATE, V2

[9]

JANSSENS JG, 1992, WATER ENG MANAG, V139, P26

[10]

MALLEY JP, 1988, THESIS U MASSACHUSET

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