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Sodium hydrosulfite wastewater treatment method

A waste water treatment and hydrosulfite technology, which is applied in the field of water treatment, can solve the problems of high cost of waste water treatment, high content of sulfate radicals, large consumption of oxidant, etc., and achieve low cost of waste water treatment, reduction of COD and sulfur content, and mild conditions Effect

Active Publication Date: 2020-07-28
河南安翼环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the advanced oxidation method (such as the Fenton method) is used to directly oxidize and decompose the sulfur-containing compounds in the wastewater, the reaction conditions are harsh, and a large amount of oxidant is consumed, the cost of wastewater treatment is high, and the sulfate content in the treated water is high, which is not conducive to subsequent biochemical reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present embodiment provides a kind of hydrosulfite wastewater treatment method, it comprises the following steps:

[0026] The primary oxidation is at 50-60°C, adding manganese sulfate to the sodium hydrosulfite wastewater in an amount of 400 mg / L, and then introducing oxygen and reacting for 1-3 h to oxidize the sulfur-containing inorganic substances in the sodium hydrosulfite wastewater. matter to obtain primary oxidation wastewater; wherein, the main chemical reaction in this step is: 2O 2 +2S 2- +H 2 O=S 2 o 3 2- +2OH - ;2O 2 +2HS - =S 2 o 3 2- +H 2 O;

[0027] o 2 +2SO 3 2- =2SO 4 2- ;S 2 o 3 2- +2O 2 +2OH - =2SO 4 2- ;

[0028] Acidification Add sulfuric acid to the primary oxidation wastewater, the addition is 30 ml / L, decompose the thiosulfate in the primary oxidation wastewater, filter, and obtain acidification wastewater; wherein, the main chemical reactions in this step are: S 2 o 3 2- +H 2 SO 4 = SO 2 +S+H 2 O+SO 4 2- ;...

Embodiment 2

[0033] The present embodiment provides a kind of hydrosulfite wastewater treatment method, it comprises the following steps:

[0034] Add quicklime to the sodium hydrosulfite wastewater for precipitation in the primary oxidation, the addition amount is 20 g / L, and filter to obtain the primary filtrate; at 60-70°C, add manganese sulfate to the primary filtrate, the addition amount is 300 mg / L , and then feed air and react for 1 to 3 h to oxidize the sulfur-containing inorganic matter in the sodium hydrosulfite wastewater to obtain primary oxidation wastewater; wherein, the main chemical reactions in this step are:

[0035] 2O 2 +2S 2- +H 2 O=S 2 o 3 2- +2OH - ;2O 2 +2HS - =S 2 o 3 2- +H 2 O;

[0036] o 2 +2SO 3 2- =2SO 4 2- ;S 2 o 3 2- +2O 2 +2OH - =2SO 4 2- ;

[0037] Acidification Add quicklime to the primary oxidation wastewater to precipitate, the addition is 5 g / L, and filter to obtain the secondary filtrate; add sulfuric acid to the secondary fil...

Embodiment 3

[0044] The present embodiment provides a kind of hydrosulfite wastewater treatment method, it comprises the following steps:

[0045] The primary oxidation is at 70-90°C, adding manganese sulfate to the sodium hydrosulfite wastewater in an amount of 200 mg / L, and then introducing oxygen and reacting for 1-3 hours to oxidize the sulfur-containing inorganic substances in the sodium hydrosulfite wastewater. to obtain primary oxidation wastewater;

[0046] Acidification Add sulfuric acid to the primary oxidation waste water, the addition is 10 ml / L, decompose the thiosulfate in the sodium hydrosulfite waste water, filter, and obtain the acidified waste water;

[0047] Secondary oxidation first adjusts the pH value of the acidified wastewater to 3-4, then adds ferrous sulfate and hydrogen peroxide, and reacts for 20-60 minutes to obtain the secondary oxidation wastewater; wherein, the ferrous sulfate and the The add-on of above-mentioned hydrogen peroxide is respectively 100 mmol / ...

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Abstract

The invention provides a method for treating sodium hydrosulfite production wastewater. The method comprises feeding oxidizing gas into sodium hydrosulfite production wastewater at a temperature of 25-180 DEG C so that a sulfur-containing inorganic substance in the sodium hydrosulfite production wastewater is oxidized and primary oxidized wastewater is obtained, adding sulfuric acid into the primary oxidized wastewater so that the thiosulphate anion in the primary oxidized wastewater is decomposed, carrying out filtration to obtain acidification wastewater, mixing the acidification wastewater and an oxidizing agent for oxidation so that a sulfur-containing organic substance in the acidification wastewater is transformed into a sulfur-containing inorganic substance and secondary oxidation wastewater is obtained, mixing the secondary oxidation wastewater and quicklime, carrying out precipitation, carrying out filtration, and carrying out anaerobic and aerobic treatment on the filtrate to obtain wastewater to be discharged. The method has the advantages of mild conditions, operation simpleness, low cost and wide application prospect.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for treating sodium hydrosulfite wastewater. Background technique [0002] Sodium thiosulfate, namely sodium thiosulfate, is a strong reducing agent, widely used in dyeing aids and bleaching agents in the textile, printing and dyeing and paper industries, and also in the fields of medicine, environmental protection and analysis. At present, the annual production capacity of my country's hydrosulfite industry is about 800,000 tons, and the annual output is about 600,000 tons. [0003] Sodium hydrosulfite is usually produced by the sodium formate method. The waste water produced by the sodium formate method to produce sodium hydrosulfite contains a large amount of organic and inorganic sulfur compounds, which has poor biodegradability and is difficult to treat. Therefore, it is necessary to carry out advanced oxidation on wastewater before biochemical treatment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/10C02F101/30
CPCC02F1/001C02F1/66C02F1/722C02F1/725C02F1/727C02F1/74C02F1/766C02F1/78C02F3/02C02F3/28C02F3/301C02F9/00C02F2101/101C02F2101/40C02F2301/08C02F2305/02C02F2305/026
Inventor 王建设赵建宏程相林宋成盈王留成
Owner 河南安翼环保科技有限公司
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