SU1244102A1 - Method of extracting aluminium-containing coagulant from water treatment slime - Google Patents

Description

The invention relates to water treatment, in particular to the regeneration of coagulants used for the purification of natural and waste waters,

The purpose of the invention is to increase the recovery rate after long storage of the sludge.

Example. The sludge obtained by coagulating the water of the Severnaya Dvina river with aluminum sulphate is thickened in a centrifuge to 14% suspended solids. The aluminum hydroxide content is 28% (1.5 g-eq / dm). Add to 1000 ml pshama 24 ml of 20% lithium chloride solution (0.1 g-eq / dm). The equivalent ratio of lithium ions to aluminum ions in the sludge is 1:15. The suspension is stirred for 15 minutes and left in a closed glass for two months. After two months, 2000 ml of a 4% sulfuric acid solution are added to 1000 ml of sludge and stirred for 10 minutes. The solid phase is separated from the solution and the aluminum content is determined by the standard photo-colorimetric method with a style-base reagent. The alumina content is

Example 5 (by a known method). G1lam formed during the coagulation of the water of the Severnaya Dvina River, as in Example 1, is kept in a closed glass for 10, 20 days and two months. After storage, to 1000 ml of sludge with a suspended matter content of 14% and an alumina-w hydroxide concentration of 28% are added

430 mg / dm. At the same time, the degree of regeneration - 30 to 2000 ml of 4% aqueous solution of coagulant hydrochloric acid is 64 ,, 1%. Example 2. Gilam obtained from the coagulation of the water of the Severnaya Dvina river with aluminum sulphate, is centrifuged to a concentration of suspended substances of 15.6%. At that, the content of aluminum hydroxide is 31.4% (1.9 g-eq / dm ). To 2000 from the slurry / 48 ml of a 20% solution of lithium chloride (0.1 g-eq / dm) are added. The ratio of je lithium ions to aluminum ions is 1:20. The suspension is interrupted for 15 minutes and left in a closed glass for 30 days.

After 30 days, 2000 ml of waste water K-catio 1 STT filters with a pH of 1.84 are added to 1000 ml of sludge and the mixture is mixed for 10 minutes. The solid phase is separated from the solution and A. Lezhnin’s editor.

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Tehred N. Bonkalo Corrector I. Erdeyi

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VShShSh of the USSR State Committee for Inventions and Discoveries I3035, Moscow, Zh-35, Raushsk nab. 4/5

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The content of aluminum in the latter is determined by the standard photocolorimetric method with the stilt reagent, baso. The aluminum content is 465 mg / d. The coagulum recovery rate is 59.3%.

EXAMPLE 3 The process is carried out analogously to Example 2, but the recovery of the coagulum is carried out with hydrochloric acid.

The aluminum content of the solution is 486 mg / dm. The coagulum recovery rate was 60.2%.

Example 4: The process is carried out similarly to Example 2, but its lithium halide is its bromide, the coagulum is extracted with hydrochloric acid. The content in the solution is 446 mg / dm. - The coagulum regeneration rate is 57.2%.

Example 5 (by a known method). G1lam formed during the coagulation of the water of the Severnaya Dvina River, as in Example 1, is kept in a closed glass for 10, 20 days and two months. After storage, to 1000 ml of sludge with a suspended matter content of 14% and an alumina-w hydroxide concentration of 28% are added

2000 ml of 4% hydrochloric acid solution and perg; -: b) for 10 min. The solid phase is separated from the solution and, in the latter, the aluminum content is determined by the standard photocolorimetric method with the reagent-style. baso and coagulant regeneration rate. The aluminum content is 118, 93 and 56 mg / dm, respectively, - iTpii, the coagulum recovery rate is respectively. 14.5 and 8.8%.

As can be seen from a comparison of the known and proposed methods, the extraction of coagulant during long-term storage of “Shama” in the first case proceeds b-. more effective, and the degree of extraction is 3-4 times higher than by a known method.

Claims (2)

1. METHOD FOR REMOVING ALUMINUM-CONTAINING COAGULANT FROM ISHAM WATER TREATMENT by treatment with an acidic solution, characterized in that, in order to increase the degree of extraction after prolonged storage of sludge, lithium halide is introduced into it before storage. 2, The method of pop. 1, characterized in that the lithium halide is introduced in an amount that provides a ratio of lithium ions to aluminum ions of 1: (10-30).