SU1495307A1 - Method of cleaning waste water from heavy metals - Google Patents

Abstract

The invention relates to the treatment of wastewater from heavy metals and can be used in the mining and metallurgical industry, in electroplating shops, instrument-making and other metalworking enterprises. The aim of the invention is to increase the degree of purification of wastewater from iron and chromium. For carrying out the process, water containing heavy metals is contacted with sawdust previously treated with 4,7-di (isopropyl-hydroxy) -2,9-dimethyl-1,5,6-trithiacyclononane organic reagent in a ratio of 1: (0.5- one). The method allows increasing the degree of water purification from heavy metals to 97%. 1 hp f-ly, 3 tab.

Description

The invention relates to the treatment of waste water from heavy metals and can be used in mining and smelting industry, in electroplating workshops of instrument-making and other metal processing enterprises.

The purpose of the invention is to increase the degree of purification of wastewater from iron and chromium.

Example 1. 1 mac. sawdust is mixed with 50 ml of a solution containing 1.2 g of organic reagent 4,7-di (isopropylhydroxy) -2,9-dimethyl-1,5,6-trithia-cyclononone of the general formula

Nzs he

sns

CH5 Sji

n, 6 he

.and/

sn,

sn

1 s

/

sn /

sn

.3

four

CD

sd

with

The weight ratio of sawdust and reagent is 1: 1. The mixture is kept at room temperature for 0.5 h. The aqueous fraction is separated. Organic-modified sawdust is used to clean

. ., 149

water under static or dynamic conditions

44- i -t

The content of Cr and Fe in water is 5–100 mg / l. The flow rate of water through the sorbent under dynamic cleaning conditions is 2 MP / min.

In parallel, a purification process is carried out according to a known method, using a block of dyes red H-3V and a portion yellow H-5B for modifying the OPI.

Example 2. Similar to Example 1. The ratio of sawdust and organic reagent is varied from 1: 0.1 to 1: 5.

Example 3. Similar to example 1. The processing time of sawdust varies from 0.5 to 12 h,

The data on sewage treatment from heavy metals by means of primezra 1-3 are given respectively in Table 1, 1-3.

From the data obtained, it follows that the use of 4,7-di- (isopropyl-hydroxy) -2,9-dimethyl-1,5,6-tritium-cyclononan organic reagent for modification of sawdust with an organic ratio of 1: (055-1) It does not increase the degree of water purification from iron, chromium and other heavy metals.

The proposed method, in addition to increasing the degree of purification, has the additional advantage of simplicity in the preparation of a used sorbent. Recovery of metals with

the sorbent is eluted with an acid solution, the metals are released as hydroxides and can be recycled and used in production.

Formula and 3 about b p

e te and u

1. A method of purifying wastewater from heavy metals, including sorbshchyu on sawdust treated with an organic reagent, characterized in that, in order to improve the degree of purification from iron and chromium, A, 7-di (isopropylhydroxy) - 2,9-dimethyl-1,5,6-tritiatsiklononan general formula

Ntc he

h /

g / /

I

Claims (2)

I s iH sn, sn, SNG So G 1 C-CH / Hjc he si 2 sn. 2. A method according to claim 1, characterized in that sawdust and reagent are taken in a ratio of 1: (0.5-1), Table 1 The degree of water purification,% of gland chrome total heavy metals Known 76.0 70.6 76.0 Offered 83.2 84.2., 87.0 chrome total heavy metals The mass ratio of sawdust and reagent according to the proposed method The processing time of sawdust reagent for the proposed method 0.5 1.0 6.0 23.0 The degree of water purification in total from heavy metals,% Table 3 The degree of water purification from the total heavy metals, 87.0 89.5 96.7 96.7