Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for reducing COD (Chemical Oxygen Demand) value in high-salinity wastewater

A technology for high-salt wastewater and wastewater, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problems of poor reusability of adsorbent activated carbon, unsatisfactory treatment effect, and unfavorable microbial growth, etc. Achieve obvious environmental benefits and economic benefits, the COD value is significantly reduced, and the price is low.

Pending Publication Date: 2022-04-12
TIANJIN UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the removal efficiency of soluble substances by physical methods is low, and the reusability of the adsorbent activated carbon in the activated carbon adsorption method is poor, and the cost is high; ordinary advanced oxidation methods such as ozone and Fenton reagent have poor tolerance to inorganic salts, and the treatment effect is poor. Not ideal; in the biochemical method, the high-salt environment is not conducive to the growth of microorganisms in it, and the treatment effect is not ideal

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Take 200mL of the above wastewater, add dilute sulfuric acid to adjust the pH value to 5-6, add 60mg of nitrogen-doped carbon material; add 1.2g of potassium persulfate three times, with an interval of 20min; react at room temperature for 1h Nitrogen-doped carbon materials are removed by filtration.

[0029] Step 2: Then use dilute sodium hydroxide solution to adjust the pH of the filtrate to 5-6; transfer the filtrate to an ultraviolet treatment device, and the power of the ultraviolet lamp is 28W; turn on the circulating water bath to prevent the ultraviolet lamp from overheating. Add 0.012 mg of copper sulfate; add 1.2 g of sodium persulfate three times with an interval of 20 minutes; after adding sodium persulfate for the first time, adjust the pH value of the solution to 5-6 again.

[0030] In this embodiment, the COD value after step 1 is 647.1 ppm; the COD value after 1 hour of treatment in step 2 is 421.4 ppm, and the COD value after 3 hours of treatment...

Embodiment 2

[0032] Step 1: Take 200mL of the above wastewater, add dilute sulfuric acid to adjust the pH value to 5-6, add 200mg of nitrogen-doped carbon material catalyst, add 1.2g of potassium hydrogen persulfate three times, the interval time is 20min; react at room temperature for 1h After filtering.

[0033] Step 2: Adjust the pH value of the filtrate to 5-6 with dilute sodium hydroxide solution. The filtrate is transferred to an ultraviolet advanced treatment device, and the power of the ultraviolet lamp is 28W. Turn on the circulating water bath to prevent overheating of the UV lamp. Add 0.012 mg of copper sulfate catalyst; add 1.2 g of sodium persulfate three times with an interval of 20 minutes; after adding sodium persulfate for the first time, adjust the pH value of the solution again to 5-6.

[0034] In this embodiment, the COD value after step 1 was 496.66 ppm, the COD value after 1 hour of ultraviolet treatment was 255.8 ppm, and the COD value after 3 hours of ultraviolet ...

Embodiment 3

[0036]Step 1: Take 200mL of the above wastewater, add dilute sulfuric acid to adjust the pH value to 5-6, add 500mg of nitrogen-doped carbon material catalyst, add 1.2g of potassium hydrogen persulfate three times, the interval time is 20min; react at room temperature for 1h After filtering.

[0037] Step 2: Adjust the pH value of the filtrate to 5-6 with dilute sodium hydroxide solution. The filtrate is transferred to an ultraviolet advanced treatment device, and the power of the ultraviolet lamp is 28W. Turn on the circulating water bath to prevent overheating of the UV lamp. Add 0.012 mg of copper sulfate catalyst; add 1.2 g of sodium persulfate three times with an interval of 20 minutes. After adding sodium persulfate for the first time, adjust the pH value of the solution to 5-6 again.

[0038] In this embodiment, the COD value after step 1 is 451.5 ppm; the COD value after 1 hour of treatment in step 2 is 195.6 ppm, and the COD value after 3 hours of treatment is 120....

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
poweraaaaaaaaaa
Login to View More

Abstract

The method for reducing the COD value in the high-salinity wastewater comprises the following steps: (1) adjusting the pH value of the high-salinity wastewater to be 5-6; (2) adding a first catalyst and a first oxidant for mixing treatment, and separating out the first catalyst after the treatment is finished; (3) adjusting the pH value of the wastewater again to 5-6; and (4) adding a second catalyst and a second oxidant, mixing, and treating with ultraviolet rays. According to the method disclosed by the invention, the COD (Chemical Oxygen Demand) value in the high-inorganic-salt wastewater can be reduced to be below 300ppm.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for reducing COD in wastewater containing high inorganic salts. Background technique [0002] Water pollution and water shortages have always been major problems facing our country. my country has large coal reserves, and coal coking is the main method to realize the clean and efficient utilization of coal resources; however, a large amount of coal coking wastewater will be generated in the traditional coal coking production process, which has high pollutant content and complex components, which are extremely harmful to the environment and human health. big threat. Therefore, efficient treatment and recycling of coal coking wastewater is very important; realizing zero discharge of coal coking wastewater can not only reduce environmental pollution problems but also save water resources to a certain extent. [0003] Coal coking wastewater contains...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/30
Inventor 彭文朝吴迪孙雨晴张凤宝张国亮
Owner TIANJIN UNIV