A method and special device for removing sulfide in water

A sulfide and water removal technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Harshness, incomplete treatment, etc

Active Publication Date: 2015-11-25
江阴和悦鑫环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods have their own limitations. The alkali absorption method, precipitation method, and air stripping method have poor treatment effects on medium and low concentration sulfur-containing wastewater. Problems such as large area and high energy consumption, demanding equipment materials, and incomplete treatment are not suitable for domestic enterprises, especially small and medium-sized enterprises.

Method used

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  • A method and special device for removing sulfide in water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The concentration of sulfide in the raw water is 830mg / L, the conductivity is 3618μs / cm, and the pH value is about 7.2. It directly enters the first-level electrochemical device (the size is 45×45×250mm, the volume is 0.5L when no electrode is installed, and the anode plate is Low-carbon steel plate, the cathode plate is stainless steel plate, the distance between the adjacent anode plate and the cathode plate is 3mm), the water flow rate is 4L / hour, the working current is 2A, the working voltage is 5.3V, the plate current The density is 4mA / cm 2 , The electrolysis time is 240s. The water treated by primary electrochemical treatment entered the clarification tank, and after standing for 60 minutes, the sulfide content in the water was measured to be 3.6mg / L.

[0051] Add 0.1mL / L hydrogen peroxide to the water after the first-level electrochemical treatment, and then enter the second-level electrochemical device (the same size as the first-level electrochemical device) ...

Embodiment 2

[0054] After arsenic-containing waste acid water from a copper smelter in Guangxi was removed by sulfidation, the sulfide concentration in the water was 109mg / L, the conductivity was 13724μs / cm, and the pH value was about 3.7, and it directly entered the primary electrochemical device (size 45 ×45×250mm, the volume is 0.5L when no electrode is installed, the anode plate is low-carbon steel plate, the cathode plate is stainless steel plate, the distance between adjacent anode plates and cathode plates is 5mm), and the water flow rate is 4L / hour, the working current is set to 0.5A, the working voltage is 1.8V, and the plate current density is 1mA / cm 2 , The electrolysis time is 120s. The water treated by primary electrochemical treatment entered the clarification tank, and after standing for 60 minutes, the sulfide content in the water was measured to be 1.9mg / L.

[0055] Add 0.05mL / L hydrogen peroxide to the water after the first-level electrochemical treatment, and then ent...

Embodiment 3

[0058] The raw water contains 612μg / L sulfide, the conductivity is 427μs / cm, and the pH value is about 6.7. After adding 0.02mL / L hydrogen peroxide and mixing evenly, it directly enters the secondary electrochemical device (size 45×45×250mm, when no electrode is installed) The volume is 0.5L, the anode plate is low-carbon steel plate, the cathode plate is stainless steel plate, the distance between adjacent anode plates and cathode plates is 4mm), the water flow rate is 10L / hour, and the working current is set to 0.2A , the working voltage is 1.3V, the plate current density is 4mA / cm 2 , The electrolysis time is 360s. The treated water enters the clarification tank, and after standing for 60 minutes, the sulfide content in the water is measured to be 0.7 μg / L, reaching the drinking water standard.

[0059] According to the experimental parameters and results, it can be calculated that the power consumption per ton of water is 0.06kwh, and the consumption of iron is 62g.

[0...

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Abstract

The invention relates to the technical field of water purification and particularly relates to a method for efficiently removing sulfide in water and a special device for the method. Two-stage electrochemical treatment is carried out by using a two-stage chemical treatment device, and iron or iron alloy is used as an anode in the two-stage electrochemical treatment, wherein high-concentration sulfide in water is treated in the first-stage electrochemical treatment stage by means of the oxidation effect of the anode and the sedimentation effect of ferrous irons generated by dissolving iron anodes, and low-concentration sulfide in water is rapidly and thoroughly removed through adding a proper amount of hydrogen peroxide before second-stage electrochemical treatment by means of ferrous ions generated by uniformly dissolving the hydrogen peroxide and the anode, fenton reaction generated by electrochemical effects and an electrocatalytic effect. When the method is used for treating sulfide-contained wastewater or domestic drinking water, the removal rate of sulfide can be more than 99.9%. Generally speaking, after sulfide-contained wastewater and domestic drinking water are treated by using the method provided by the invention, the content of sulfide can be respectively up to the discharging standard and the drinking water standard.

Description

technical field [0001] The invention relates to the technical field of water purification, in particular to a method for removing sulfide in water and a special device thereof. Background technique [0002] Oil refining, petrochemical, pharmaceutical, fuel, tanning and other industries will produce a large amount of sulfur-containing wastewater in the production process, and sodium sulfide and other chemicals commonly used in the water treatment industry will also contain sulfide in the water due to excess. Sulfide in water is toxic, corrosive, and has a foul smell. If it is discharged directly without treatment, it will cause great pollution to the environment. my country's "Comprehensive Wastewater Discharge Standard" strictly controls the discharge limit of sulfide in industrial wastewater. The first and second standards are 0.5mg / L, and the third standard is 1mg / L. Therefore, the sulfur-containing wastewater in production and life must be properly treated. [0003] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06
Inventor 尚建库徐正超
Owner 江阴和悦鑫环保科技有限公司
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