RU1838246C - Method of water treatment from bromides - Google Patents

Abstract

The invention relates to water treatment. During the cleaning process, bromine and / or iodine ions are removed to the MPC standards. Due to the use of anion exchange resin with primary and secondary and / or tertiary amino groups in the treatment of water, modified with metal salts forming amine complexes with anion exchange resin, the process productivity increases and the dynamic sorption capacity of the anion exchange resin increases. 2 s.p. f-ly, 1 table,

Description

The invention relates to the field of water treatment and can be used to remove bromine and / or iodine ions to the norms of Maximum Permissible Concentrations (MPC) and below from waters intended for drinking purposes or discharge into open water bodies.

The purpose of the invention is to develop a method that enables the purification of water from bromine and / or iodine ions, as well as to develop a more technological highly selective purification method and increase its productivity by increasing the filtration rate while maintaining a high degree of purification.

The proposed technical solution ensures the achievement of a technical result, can be implemented in the process of purifying water from bromides and iodides to produce drinking water and wastewater treatment (see table).

As the sorbent used, for example, anion exchangers:

AN-511 (TU 6-05-211-1311-85) - contains primary and secondary amino groups; AN-221 (GOST 20301-74) - contains primary and secondary amino groups; ANB-11-G (TU 6-05-255-92) - contains tertiary amino groups; AN-31-G (TU 6-05-1935-82) - contains primary, secondary and tertiary amino groups.

When anion exchange resin is treated with metal salt solutions, amine complexes are formed.

By way of example, the following are the steps for preparing amine complexes with a copper salt; production of copper chloride by reduction of copper sulfate with hydroxylamic in an alkaline environment

CuSO-j + NHaOH HCI + 2NaOH- CuCI + + No. 2504 + 1 / 2Na + 3H20;

preparation of sodium chlorocuprinate by treatment of precipitated copper chloride with a saturated solution of sodium chloride

CuCI + NaCI Na CuCl2;

the implementation of the re-reaction with the treatment of anion exchange resin (OH-form) with a solution of sodium chlorocuprinate

45 b

ABOUT

)

m (NH) + Na {CuCl2MCu (NH) + NaCI.

The water purification process is carried out by passing it through a modified with metal salts anion exchange resin loaded into the filter. The process is conducted until the occurrence in the filtrate. bromide or iodide ions, in amounts exceeding the MAC values.

The spent sorbent is regenerated with a 5% sodium chloride solution, passing it through a filter until the iodides bromide is completely displaced.

LI me R 1. Extraction of bromides and iodides from sea water, desalinated by electrodialysis to a residual total salt content of 500 mg / l and a content of bromides and iodides of 2 mg / l, is carried out on a sorbent obtained on the basis of anion exchange resin AN-511 with a silver content of 45 g / l (30% of the total exchange capacity of the amino groups). Sorption is carried out in a column with a height of the sorbent loading layer of 40 ml at a specific flow rate of 5 volume of water / volume of sorbent in 1 hour.

The results of the experiment are presented in the table.

Example 2. The process is carried out similarly to that described in example 1, but at a specific flow rate of 10.

Examples Zi5. The process is carried out as described in Example 1, but copper compounds are used as the metal salt.

Example 4. The process is carried out as described in Example 1, but mercury compounds are used as the metal salt.

PRI me R b. The process is carried out as described in example 5, but the source water contains only iodides.

Example. The process is carried out as described in Example 5, but the feed water contains only bromides.

Examples 8-10. The process is carried out similarly to that described in example 3, but AN-221 was used as a sorbent.

Example 11. The process is carried out as described in example 8, but mercury compounds are used as the metal salt.

EXAMPLES 12-14, The process is carried out similarly to that described in example 1, but ANB-11G was used as a sorbent.

Examples 15 and 16. The process is carried out 5 as described in example 12, but copper compounds are used as the metal salt .:

PRI me R s 17 - 20. The process is carried out similarly to that described in example 3, but AN 0 31 was used as a sorbent.

Examples 21-23. The process is carried out according to the prototype.

Examples 14 and 19, 20 show that the dynamic sorption capacity of the sorbent for bromides and iodides decreases when the stated limits of the amount of metals forming amine complexes with anion exchange resin and the specific flow rate

0 using the inventive method, a positive technical result is created, which consists in achieving the possibility of extraction of both bromine ions and / or iodine; the possibility of increasing productivity 5 by a factor of 2–10 while maintaining a high degree of purification (by increasing the specific flow rate), and by increasing the dynamic sorption capacity of anion exchange resin by a factor of 2–3. 0

Claims (3)

1. A method of purifying water from bromides, comprising treating the water with a sorbent in 5 dynamic mode, characterized in that anion exchange resin with primary and secondary and / or tertiary amino groups, modified with metal salts, is used as a sorbent 0 amine complexes with anion exchange resin in the amount of 30 - 100% of the total exchange capacity of the amino groups, 2. The method according to claim 1, characterized in that the silver salts of copper, lead, mercury, platinum, gold and molybdenum are used as metal salts forming 5 amine complexes with anion exchange resin. 3. The method according to claims 1 and 2, with the exception that cleaning is carried out at a specific flow rate of 1-10 water objects / sorbent volume in 1 hour. ) Designation: 1. 11. in. IV - respectively primary, secondary. tertiary and - quaternary amino groups containing Editor Compiled by K. Saldadze Tehred M. Morgenthal anion exchange resin. Proofreader L. Pilipenko