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Method for desulfurizing sodium sulfide wastewater

A sodium sulfide and wastewater technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The problem of large dosage of oxidant can achieve the effect of improving utilization rate, improving utilization efficiency and low input cost

Active Publication Date: 2015-08-05
NANJING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for desulfurizing sodium sulfide wastewater

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Embodiment 1

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

[0037] In the process of organic synthesis, oxygen is the most environmentally friendly oxidant. Catalytic materials are often used in organic synthesis to increase the oxidation activity of oxygen as a...

Embodiment 2

[0049] A method for desulfurization of sodium sulfide wastewater in this embodiment, the steps are the same as those in embodiment 1, wherein:

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

[0051] S in effluent 5 2- 15mg / L, the removal rate is about 70%, 80% of the supernatant is used to return 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 shipped out in packages.

Embodiment 3

[0053] A method for desulfurization of sodium sulfide wastewater in this embodiment, the steps are the same as those in embodiment 1, wherein:

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

[0055] S in effluent 5 2- It is 10mg / L, 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, has a wide range of applications in the production of industrial products, and is an important industry indispensable in the development of the national economy. While the electroplating industry has achieved rapid development, the environmental problems brought by it have become increasingly prominent. According to the "Status and Development Analysis and Forecast of the Electroplating Industry" statistics, there are more than 40,000 domestic electroplating companies and more than 5,000 regular production lines. According to statistics, more than 90 electroplating parks have been established in more than 10 provinces across the country (including t...

Claims

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Application Information

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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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