EFFECT OF MAGNESIUM-HYDROXIDE (OR HYDRATED MGO) FORMED UNDER ALKALINE CONDITIONS ON BRACKISH WATER PRETREATMENT FOR REVERSE-OSMOSIS

被引：3

作者：

MAVROV, V ^{[1
]}

DOBREVSKY, I ^{[1
]}

BONEV, B ^{[1
]}

PETKOV, N ^{[1
]}

机构：

[1] UNIV CHEM TECHNOL,BU-8010 BURGAS,BULGARIA

来源：

DESALINATION | 1992年 / 85卷 / 03期

关键词：

18;

D O I：

10.1016/0011-9164(92)80015-2

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Experiments were carried out for pretreatment of feed water for RO by adsorption of colloidal matter on Mg(OH)2 (or hydrated MgO) formed as well as comparative experiments for brackish water pretreatment by: (1) coagulation and flocculation; (2) lime softening, coagulation and flocculation; (3) lime softening and adsorption on the Mg(OH)2 formed; (4) lime-alkaline softening and adsorption on the Mg(OH)2 formed; (5) dolomitic lime softening and adsorption with hydrated MgO formed. It was established that colloidal matter in brackish lake water is sharply reduced only by adsorption on the Mg(OH)2 (or hydrated MgO) formed in sufficient quantity and the pretreated feed water meets the requirements of the spiral wound and hollow fibre membranes. Optimum results for pretreatment of the tested water by adsorption on the Mg(OH)2 formed and maximum rate of precipitation of the CaCO3 and Mg(OH)2 are achieved when the ratio CaCO3:Mg(OH)2 is 3:2. It was found that technologically and economically the most advantageous method for brackish lake water pretreatment is dolomitic lime softening, where dolomite dosage of 450 mg/l and a reaction time of more than 1 h is needed in order to reach heterogeneous equilibrium.

引用

页码：335 / 343

页数：9

共 18 条

[1]

ALBORNO AY, 1989, 4 P WORLD C DES WAT, V2, P3

[2]

ALEKSIEV L, 1982, VODOSNABJENIE SAN TE, V2, P29

[3]

BOHN L, 1983, ACTA HYDROCH HYDROB, V2, P215

[4]

COCHECI V, 1979, B STI SI TECHN I POL, V24, P31

[5]

DZIUBEK A, 1984, P S FUTURE WATER REU, V3, P1428

[6]

Eckenfelder Jr. W. W., 1980, PRINCIPLES WATER QUA

[7]

GLOYNA EF, 1970, WATER QUALITY IMPROV

[8] EXPERIENCE AND RESULTS ON THE OPERATION OF THE COMMON PRETREATMENT AT DROP [J].

GRIGOLEIT, J ;

SCHOTTLER, B .

DESALINATION, 1987, 63 :209-215

[9]

KIMASADA V, 1977, P INT C DESALINATION, V1, P243

[10]

MAVROV V, 1990, MEMBRANES MEMBRANE P

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