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Complex reagent capable of removing tin in sewage

A compound agent and wastewater technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem that the depth of tin removal is difficult to reach the standard of drinking water, the resin is easily polluted, Incomplete regeneration and other problems, to achieve significant treatment effect, high efficiency of tin removal, no secondary pollution

Inactive Publication Date: 2013-05-08
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The precipitation method can quickly reduce the high concentration of tin in water, and the treatment effect is good, but the treatment cycle is long, and the depth of tin removal is difficult to reach the standard of drinking water
Although the ion exchange method has certain application examples, it has a large one-time investment, high operating costs, the resin is easily polluted or oxidized, and the regeneration is frequent and incomplete.
The notification number is CN1085736C, which discloses a method for removing tin from ammonium tungstate solution by ion exchange. The invention uses strong basic quaternary ammonium anion resin as an exchange agent, and hydrogen peroxide as a regeneration agent, which improves the tin removal rate, but does not Suitable for tin removal in potable water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] (1) Add polyaluminum chloride and polyacrylamide flocculants to the tin-containing wastewater to carry out flocculation and sedimentation treatment; (2) Add 30 ppm of organic ester and inorganic salt composite agents to the wastewater for removing suspended particles, of which cyclopropane 20ppm of ethyl formate, 5ppm of triethyl orthoacetate, and 5ppm of sodium hydrosulfide are fully stirred evenly, so that the tin in the wastewater exists in the form of divalent; Air valve, the steam-water mixture is released, and rises with the tiny bubbles until a layer of greasy substance is formed on the surface of the wastewater; (4) scrape off the upper layer of greasy substance with a slag scraper, which can reduce the tin in the wastewater from 258mg / L To 0.26mg / L, the tin removal rate reached 99.9%.

example 2

[0021] (1) Add polyaluminium chloride and polyacrylamide flocculant to the tin-containing wastewater to carry out flocculation and sedimentation treatment; (2) Add 40 ppm of organic ester and inorganic salt composite agent to the wastewater for removing suspended particles, in which chloroformic acid 20ppm of phenyl ester, 10ppm of diisopropyl phosphite, and 10ppm of sodium carbonate are fully stirred evenly, so that the tin in the waste water exists in the form of divalent; (3) The waste water is lifted into the pressure dissolved air tank with a steam-water mixing pump, and then the air valve is released , the soda-water mixture is released, and rises with tiny bubbles until a layer of greasy substance is formed on the surface of the wastewater; (4) Scraping the upper layer of greasy substance with a slag scraper can reduce the tin in the wastewater from 172mg / L to 0.086 mg / L, the tin removal rate reached 99.95%.

example 3

[0023] (1) Add polyaluminum chloride and polyacrylamide flocculants to the tin-containing wastewater to carry out flocculation and sedimentation treatment; (2) Add 50 ppm of organic ester and inorganic salt composite agent to the wastewater for removing suspended particles, in which orthoacetic acid 20ppm of triethyl ester, 20ppm of phenyl chloroformate and 10ppm of magnesium carbonate are fully stirred evenly, so that the tin in the waste water exists in the form of divalent; The soda-water mixture is released, and rises with tiny bubbles until a layer of greasy substance is formed on the surface of the wastewater; (4) Scraping the upper layer of greasy substance with a slag scraper can reduce the tin in the wastewater from 237mg / L to 0.071mg / L, the tin removal rate reached 99.97%.

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PUM

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Abstract

The invention discloses a complex reagent capable of removing tin in sewage, belonging to the field of sewage treatment in environment protection. The complex reagent is formed by compounding organic ester and inorganic salt, wherein the organic ester refers to two or more of ethyl cyclopropanecarboxylate, trithyl orthoacetate, ethyl cyclopropanecarboxylate, phenyl chloroformate, and diisopropyl phosphate; and the inorganic salt refers to one or two of sodium bisulfide, ammonium sulfide, sodium hydrogen phosphate, sodium dihydrogen phosphate, sodium carbonate and magnesium carbonate. The complex reagent has the characteristics of being wide in available raw materials, low in cost, lower in reagent feeding amount, low in running cost, free from secondary pollution in a treatment process, high in tin removal efficiency, capable of achieving the removal rate by more than 99.9%, and the like.

Description

technical field [0001] The invention relates to a compound agent for removing tin in waste water, which belongs to the field of waste water treatment in environmental protection. Background technique [0002] Tin is mainly used in the electroplating industry. For the recovery of tin ions in sewage, there are many methods and processes, such as "a method for synthesizing zinc hexahydroxystannate by using nitric acid type tin stripping wastewater" with the classification number C01G19 / 00 (2006.01) I This method fixes and recovers tin in the form of products, and uses chemical precipitation to achieve the effect of removal, but at present there is no way to remove tin by using adsorption materials. The present invention is aimed at the blank in this field. A compound agent for removing tin in wastewater is proposed. [0003] Commonly used tin removal methods include sulfide precipitation, adsorption co-precipitation, ion exchange, solvent extraction and selective precipitation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F9/04
Inventor 汪巍
Owner CHANGZHOU UNIV
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