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Treatment method of DSD acid oxidative condensation wastewater

A treatment method, acid oxidation technology, applied in the direction of water/sewage treatment, natural water treatment, water treatment parameter control, etc., can solve the problems of substandard wastewater discharge, unsatisfactory results, large equipment investment, etc., and achieve equipment investment costs Low, suitable for continuous production, easy to promote the effect of application

Active Publication Date: 2019-12-20
中节能铁汉盖雅(北京)环境科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The treatment effect of this method is acceptable, but the equipment investment is large, the process is complicated, and the operating cost is high, which is unbearable for enterprises.
[0011] In summary, the use of conventional industrial wastewater treatment technology to treat DSD acid oxidation condensation wastewater cannot achieve satisfactory results.
As my country's environmental protection situation is becoming increasingly severe, many DSD acid production enterprises are restricted or even shut down due to substandard wastewater discharge.

Method used

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  • Treatment method of DSD acid oxidative condensation wastewater

Examples

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Comparison scheme
Effect test

Embodiment 1

[0049] 500g of waste water from oxidation condensation workshop (ie DSD acid oxidation condensation waste water), reddish brown, COD=31280mg / L, pH=6.5, salt content 16.2%.

[0050] (1) Add iron powder (particle size is 50~60 orders, add-on is 0.5% of the quality of DSD acid oxidation condensation wastewater quality), sulfuric acid (consumption is 8.0% of the quality of DSD acid oxidation condensation wastewater quality) and sodium acetate in reactor (the amount added is 0.2% of the mass of the DSD acid oxidation condensation wastewater), stirred and reacted at room temperature for 10 minutes to obtain an acidic activation solution;

[0051] (2) Add 500g of DSD acid oxidative condensation wastewater into the reaction kettle, mix the acidic activation solution with the nearly neutral oxidative condensation wastewater, the pH value of the liquid phase system becomes 2~3, and the reaction temperature is (45±3)°C After stirring and reacting for 1 h, the reaction solution was suctio...

Embodiment 2

[0054] 500g of wastewater from the oxidation condensation process (ie DSD acid oxidation condensation wastewater), reddish brown, COD=29980mg / L, pH=6.5, salt content 18.1%.

[0055] (1) add ferrous sulfate (add-on is 0.9% of DSD acid oxidation condensation waste water quality), sulfuric acid (consumption is 10.0% of DSD acid oxidation condensation waste water quality) in reactor; And ammonium chloride (add-on is DSD 0.4% of the mass of the acid oxidation condensation wastewater), stirred and reacted at room temperature for 10 minutes to obtain an acidic activation solution;

[0056] (2) Add 500g of DSD acid oxidative condensation wastewater into the reactor, mix the acidic activation solution with the nearly neutral oxidative condensation wastewater, the pH value of the liquid phase system becomes 2 to 3, and the reaction temperature is (40±3)°C After stirring and reacting for 1 h, the reaction solution was suction filtered to obtain the first filtrate;

[0057] (3) adopt NaO...

Embodiment 3

[0059] 500g of wastewater from the oxidation condensation process (ie DSD acid oxidation condensation wastewater), reddish brown, COD=34570mg / L, pH=7.3, salt content 21.2%.

[0060] (1) add ferrous nitrate (addition is 0.4% of DSD acid oxidation condensation waste water quality), sulfuric acid (consumption is 12.0% of DSD acid oxidation condensation waste water quality) in reactor; And sodium acetate (addition is DSD acid oxidation condensation waste water quality) 0.3% of the mass of the oxidation condensation waste water), stirred and reacted at room temperature for 10 minutes to obtain an acidic activation solution;

[0061] (2) Add 500g of DSD acid oxidative condensation wastewater into the reactor, mix the acidic activation solution with the nearly neutral oxidative condensation wastewater, the pH value of the liquid phase system becomes 1~2, and the reaction temperature is (48±5)°C After stirring and reacting for 1 h, the reaction solution was suction filtered to obtain ...

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Abstract

The invention provides a treatment method of DSD acid oxidative condensation wastewater, and belongs to the technical field of oxidative condensation wastewater treatment. The treatment method comprises the following steps: (1) mixing reductive iron, an inorganic acid and an activation stabilizer, and activating the reductive iron to obtain an acidic activation solution; (2) mixing the acidic activation solution with DSD acid oxidative condensation wastewater, carrying out reduction reaction, and carrying out solid-liquid separation to obtain a first filtrate; (3) adding a metal collecting agent into the first filtrate to obtain a collecting system; and (4) carrying out decoloration flocculation treatment on the collecting system, and carrying out solid-liquid separation to obtain treatedwastewater. It is shown by results of embodiments that before treatment, the DSD acid oxidative condensation wastewater is reddish brown, COD is larger than or equal to 20000 mg / L, the treated wastewater becomes clear and light red, COD can be reduced to 4000 mg / L, and the organic matter removal rate is 80% or above.

Description

technical field [0001] The invention relates to the technical field of oxidative condensation wastewater treatment, in particular to a treatment method for DSD acid oxidative condensation wastewater. Background technique [0002] The synthesis of DSD acid includes sulfonation, oxidative condensation and reduction. Specifically, p-nitrotoluene (PNT) obtains p-nitrotoluene orthosulfonic acid (NTS) through oleum sulfonation reaction; / tributyl ester / manganese sulfate catalyzed, oxidative condensation occurs to obtain 4-4'-dinitrostilbene-2-2'-disulfonic acid (DNS); DNS is catalytically hydrogenated (reduced) by iron powder to obtain 4, 4-Diaminostilbene-2,2-disulfonic acid (DSD acid). The specific process is as follows (tributyl ester is not marked in the oxidation condensation section): [0003] [0004] In the production process of DSD acid, the waste acid based on sulfuric acid will be produced in the sulfonation stage; a large amount of dark red high salt (SO 4 2- ) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/36
CPCC02F1/54C02F1/56C02F1/64C02F1/66C02F1/70C02F9/00C02F2103/36C02F2209/06C02F2209/08
Inventor 吴绍祖黄晶晶刘玉涛白鑫王玉枝乔爱滋
Owner 中节能铁汉盖雅(北京)环境科技有限公司
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