A method for desulfurization of sodium sulfide wastewater

A sodium sulfide and waste water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of difficult to effectively control the dosage of ferrous sulfate, the generation of heavy metal sludge, Problems such as large dosage of oxidant, to achieve the effect of improving utilization rate, improving utilization efficiency, and low input cost

Active Publication Date: 2017-10-24
NANJING UNIV +1
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  • Abstract
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Problems solved by technology

[0007] The present invention aims at the existing electronic electroplating wastewater, in the heavy metal removal process, the desulfurization treatment of excess sodium sulfide has low desulfurization efficiency, large dosage of oxidant, heavy metal sludge, increased operating cost, and it is difficult to effectively control the dosage of ferrous sulfate A large amount of excessive iron ions also has a significant inhibitory effect on biochemical treatment.

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  • A method for desulfurization of sodium sulfide wastewater

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Embodiment 1

[0036] The present invention aims at the technical difficulties in the desulfurization treatment process of the sodium sulfide residual solution in the existing electronic electroplating wastewater and metal copper removal process: low desulfurization efficiency, large amount of oxide dosage, high cost, introduction of other ions is not conducive to biochemical treatment, etc. Using the chemical reaction 2Na 2 S+O 2 +2H 2 O==4NaOH+S↓, provide suitable reaction conditions to make the reaction go forward continuously, effectively treat sodium sulfide wastewater, high desulfurization efficiency, low input cost, only need aeration without adding other Chemical agents, green and environmentally friendly, are conducive to further biochemical treatment of wastewater.

[0037] In the process of organic synthesis, oxygen is the most green and environmentally friendly oxidant. In the process of organic synthesis, catalytic materials are often used to increase the oxidation activity of...

Embodiment 2

[0049] A kind of method of sodium sulfide wastewater desulfurization of the present embodiment, step is the same as embodiment 1, wherein,

[0050] In step (A), the waste liquid containing sodium sulfide is adjusted to pH=7.0, and S in the waste liquid of sodium sulfide 2- 50mg / L; the aeration gas-water ratio in step (B) is 10:1, the aeration reaction time is 2h, the mass content of catalyst 3 is 10%, and the reaction time is 2h; the static precipitation in step (C) is 2h;

[0051] S in the water 5 2- 15mg / L, the removal rate is about 70%, 80% of the supernatant is used to reflux to the front stage of the process to provide alkalinity, and the rest of the supernatant is used to enter the next sewage treatment unit 6, and the remaining in the sedimentation tank 4 The sediment is taken out and packaged for shipment.

Embodiment 3

[0053] A kind of method of sodium sulfide wastewater desulfurization of the present embodiment, step is the same as embodiment 1, wherein,

[0054] In step (A), the waste liquid containing sodium sulfide is adjusted to pH=6.0, and S in the waste liquid of sodium sulfide 2- 20mg / L; in step (B), the aeration gas-water ratio is 20:1, the aeration reaction time is 1h, the mass content of catalyst 3 is 5%, and the reaction time is 1h; in step (C), static precipitation is 1.5h;

[0055] S in the water 5 2- It is 10mg / L, and the removal rate is about 70%. The supernatant enters the next sewage treatment unit 6, and the remaining sediment in the sedimentation tank 4 is taken out, packed and shipped out.

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Abstract

The invention discloses a method for desulfurizing sodium sulfide wastewater, belonging to the fields of electronic electroplating wastewater treatment and comprehensive reutilization. The method comprises the following steps: (A) regulating the pH value of sodium-sulfide-containing waste liquor to 6.0-9.0; (B) introducing the sodium-sulfide-containing waste liquor subjected to pH value regulation in the step (A) into an aeration reaction tank, starting an aerator while adding 0.1-10 wt% of catalyst, and reacting for 0.5-2 hours; (C) naturally flowing the mixed solution obtained in the step (B) into a precipitation tank, and standing to precipitate for 1-2 hours; and (D) sending the supernate in the step (C) into the next sewage treatment unit as effluent water, taking out the residual precipitate in the precipitation tank, packing, and transporting. The catalyst is a metal and oxide thereof or a mixture of multiple metals and oxides thereof. The method has the advantages of high oxidization efficiency, thorough desulfurization, simple technique and the like, and can effectively remove sodium sulfide in wastewater.

Description

technical field [0001] The invention belongs to the field of electronic electroplating wastewater treatment and resource comprehensive utilization, and more specifically relates to a method for desulfurizing sodium sulfide wastewater. Background technique [0002] Electroplating is an indispensable basic process in metal processing. It is widely used in the production of industrial products and is an indispensable and important industry in the development of the national economy. While the electroplating industry has achieved rapid development, environmental problems have become increasingly prominent. According to the statistics of "Status and Development Analysis and Forecast of Electroplating Industry", there are more than 40,000 domestic electroplating enterprises and more than 5,000 regular production lines. According to statistics, more than 90 electroplating parks have been built in more than 10 provinces across the country (including those that have been built, are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 张炜铭张猛徐敬生吕路潘丙才赵昕
Owner NANJING UNIV
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