SU1299973A1 - Method for removing heavy metals from waste water - Google Patents

Abstract

The invention relates to methods for purifying wastewater from heavy metals, can be used in non-ferrous metallurgy and electroplating, and allows an increase in the degree of purification. Wastewater is passed through a column filled with sludge lignin modified from 9 to 50 wt.% H-vinyloxyethylsalicylline of the formula N-CH2-CH20-CH CHr5 Purification degree 99.8%. The sorbent can be regenerated with a solution of sulfuric acid. 1 tab.

Description

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The invention relates to the treatment of waste water from heavy metals and can be used in non-ferrous metallurgy and in electroplating.

The purpose of the invention is to achieve a degree of clearing.

Example 1. In 100 ml of a solution of metal salts or waste water, the contents are. Cr, Fe, Nt, Cd, Cu, 1 g of vegetable sorbent sludge lignin is added, mixed, and after 15 minutes the residual metal content is determined.

12999732

Ethylsalicylimin (N-HEES), by holding the reagent in solution for 30-60 minutes, stirred and after 15 minutes the residual metal content is determined.

To obtain the reagent, a mixture of 12 (0.1 mol) salicylic aldehyde, 3.7 g (0.1 mol) of monoethanolamine vinyl ether is heated for 10–3 hours at 80 ° C and then distilled in vacuo. The product yield of 11.5 g - 94.8%. Reagent N-HEOSI is a dark yellow, viscous oil, poorly soluble in water, but good

Example 2. Through a column, soluble in alcohol, ether, benn-filled 5 g of sludge lignin, 100 ml of metal or waste water are passed at a rate of 2 ml / min, the residual metal content is determined at the outlet of the column.

Example 3. In 100 ml of a solution of metal salts or waste water, i g w-pam-lignin pretreated with N-vinyloxy is introduced. The modification allows an increase in the sorption capacity of the plant material, and the sorbent can be easily regenerated by washing with a solution of sulfuric acid and water, followed by applying a modifying agent. Slime lignin after 999732

Ethylsalicylimin (N-HEESI) by mixing the reagent in solution for 30-60 minutes, mix and. after 15 minutes, the residual metal content is determined.

To obtain a reagent, a mixture of 12.2 g (0.1 mol) of salicylic aldehyde and 3.7 g (0.1 mol) of monoethanolamine vinyl ether is heated for 10 3 hours at 80 ° C and then distilled in vacuo. The product yield of 11.5 g - 94.8%. The reagent N-HEOSI is a dark yellow, viscous oil, poorly soluble in water, but well

 5 soluble in alcohol, ether, bin

ash.

Example 4. The method is carried out according to Example 2 using sludge lignin as a sorbent, pretreated for 30-60 minutes with the reagent N-EOESI.

Data on the degree of purification for the proposed and known methods are given in the table.

This treatment can also be used as a fertilizer containing trace elements.

The recovery of metals from sludge lignin is carried out by elution, the metals being isolated in the form of hydroxides, which can be recycled and used in production. The use of sludge lignin as a sorbent makes it possible to efficiently utilize large-tonnage waste in

pulp and paper industry with sulphate method of cooking.

Claims (1)

Invention Formula The method of purification of waste water from heavy metals, including sorption on the plant material, modified with an additive, characterized in that The degree of purification, as a plant material using sludge-lignin, and as an additive M-vinyloxyethylsalicylimin formula. "N-CH-CHiO-CH-CHj OH in the amount of 9-50 wt.%. Editor M. Tovtin Order 1114/23 Compiled by L, Ananyeva Tehred N.Glushchenko Proofreader E, Roshko Circulation 852 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Subscription