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Method of treating sodium hydrosulfite wastewater

A treatment method and sodium hydrosulfite technology, applied in water/sewage treatment, natural water body treatment, oxidized water/sewage treatment, etc., can solve the problems that wastewater cannot be discharged directly, the composition is complex, and the COD concentration of wastewater is high

Inactive Publication Date: 2016-12-07
ZHEJIANG JIACHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The production process of sodium hydrosulfite will produce a type of wastewater. The wastewater has a high COD concentration and complex components. According to various data and literature reports, it is difficult to effectively treat this wastewater. Generally, for the reported literature, either the energy consumption is very high High, or the operation is very complicated, but there is only one kind of discussion, which is not suitable for actual production operations, and the treated wastewater cannot be directly discharged

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Raw material preparation: sodium hydrosulfite wastewater (COD 40000mg / L), dilute sulfuric acid with a mass percentage of 50%, industrial hydrogen peroxide (27.5% by mass), industrial slaked lime (calcium hydroxide, 93%), anaerobic sludge, aerobic sewage mud.

[0021] In a 2000mL beaker, add 1000mL of sodium hydrosulfite waste water, adjust the pH value to 3.5 with dilute sulfuric acid, then add 0.3g of ferrous sulfate, slowly add 5g of hydrogen peroxide dropwise, and keep the reaction at room temperature for 8 hours, then use lime to neutralize the pH value to 8.5, Then add anaerobic sludge, stir slowly for 24 hours under airtight conditions, then precipitate to remove anaerobic sludge, add aerobic sludge, and bubble and stir for 6 days, after sedimentation and removal of aerobic sludge, clear liquid wastewater is obtained.

[0022] The test data is as follows: the COD of the clear liquid wastewater is 256mg / L.

Embodiment 2

[0024] Raw material preparation: sodium hydrosulfite wastewater (COD 40000mg / L), 50% dilute sulfuric acid, industrial hydrogen peroxide (27.5%), industrial slaked lime (calcium hydroxide, 93%), anaerobic sludge, aerobic sludge.

[0025] In a 2000mL beaker, add 1000mL of waste water, adjust the pH value to 3.5 with dilute sulfuric acid, then add 0.3g of ferrous sulfate, slowly add 5g of hydrogen peroxide dropwise, keep warm for 8 hours, neutralize the pH value to 8.5 with lime, and then add anaerobic sewage The sludge was stirred slowly for 48 hours under airtight conditions, then the anaerobic sludge was removed by sedimentation, and the aerobic sludge was added and stirred by bubbling for 8 days. After the aerobic sludge was removed by sedimentation, clear liquid wastewater was obtained.

[0026] The test data is as follows: the COD of the clear liquid wastewater is 186mg / L.

Embodiment 3

[0028] Raw material preparation: hydrosulfite wastewater (COD 40000mg / L), 50% dilute sulfuric acid, industrial hydrogen peroxide (27.5%), industrial slaked lime (calcium hydroxide, 93%), anaerobic sludge, aerobic sludge.

[0029] In a 2000mL beaker, add 1000mL of waste water, adjust the pH value to 3.0 with dilute sulfuric acid, then add 0.4g of ferrous sulfate, slowly add 7g of hydrogen peroxide dropwise, keep warm for 8 hours, neutralize the pH value to 8.0 with lime, and then add anaerobic sewage Stir slowly for 24 hours under airtight conditions, then settle to remove anaerobic sludge, add aerobic sludge, bubble and stir for 6 days, settle to remove aerobic sludge, and obtain clear liquid wastewater.

[0030] The test data is as follows: the COD of the clear liquid wastewater is 191mg / L.

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Abstract

The invention discloses a method of treating sodium hydrosulfite wastewater, comprising: oxidizing and biochemically treating sodium hydrosulfite wastewater to produce low-COD wastewater; particularly, sodium hydrosulfite wastewater is subjected to pH adjustment to 1.5-2.5 via an acid, oxidized, subjected to pH adjustment to 6-10 via an alkali and then subjected to a series of biochemical treatment means to obtain low-COD wastewater; through the method, it is possible to enable the sodium hydrosulfite wastewater to meet the provisions of emission standards.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for sodium hydrosulfite waste water. Background technique [0002] The scientific name of sodium dithionite is sodium dithionite, which is a white sandy crystal or light yellow powder chemical product, with a melting point of 300°C (decomposition), an ignition temperature of 250°C, insoluble in ethanol, soluble in sodium hydroxide solution, and reacts strongly with water and burn. It is widely used in reduction dyeing, reduction cleaning, printing and decolorization of textile industry and bleaching of silk, wool, nylon and other fabrics. Because it does not contain heavy metals, the color of the bleached fabric is very bright and not easy to fade. In terms of various substances, it can also be used for food bleaching, such as gelatin, sucrose, candied fruit, and bleaching of soap, animal (plant) residue, bambooware, and china clay. It can als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/34
CPCC02F1/72C02F1/722C02F3/30C02F2103/34
Inventor 叶华明阮华林赵伟明
Owner ZHEJIANG JIACHENG CHEM
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