Supercharge Your Innovation With Domain-Expert AI Agents!

Pretreatment device and method for wastewater before chemical oxygen demand detection

A chemical oxygen demand and pretreatment device technology, which is applied in the direction of analyzing the chemical reaction of the material, analyzing the material by observing the influence of the chemical indicator, and preparing the sample for the test. It can solve the problem of large measurement results, It cannot reflect the Fenton treatment effect, affects the accuracy of the measurement results, etc., and achieves the effects of improving accuracy, eliminating interference, and reducing the amount of exhaust gas

Active Publication Date: 2016-02-03
ANGANG STEEL CO LTD
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the national standard method, potassium dichromate as an oxidant will react with residual hydrogen peroxide, seriously affecting the accuracy of its determination results
[0004] At present, the effective treatment of refractory wastewater is a difficult problem in the field of wastewater treatment. There are more and more researches on the advanced treatment of wastewater by Fenton oxidation process. However, if the existing measurement standard is used to detect COD, the residual hydrogen peroxide in the wastewater will consume a lot of weight. Potassium chromate, which makes the measurement larger than the true value and does not reflect the effect of Fenton treatment

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pretreatment device and method for wastewater before chemical oxygen demand detection
  • Pretreatment device and method for wastewater before chemical oxygen demand detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, inject 2000mL of Fenton-treated wastewater into the reactor 1 through the exhaust port 2. According to the concentration of hydrogen peroxide before Fenton oxidation is 10mmol / L, the total amount of hydrogen peroxide before the reaction of this volume of water sample is calculated as 20mmol. Afterwards, the magnetic stirring device 3 is turned on, and the waste water is stirred by the magnetic rotor 4 .

[0022] Then, open the nitrogen monoxide intake system 6, the nitrogen monoxide substance quality contained in the aeration rate per minute is 2 times of the hydrogen peroxide substance quality before oxidation in the water sample, and the aeration pressure is 85% of the bubble point pressure, and the aeration Gas time lasts 3h.

[0023] Finally, close the nitric oxide intake system 6 and continue to maintain the stirring state for 10 minutes. Exhaust the residual gas, so that there is no residual hydrogen peroxide oxidant and nitric oxide reducing agent in the ...

Embodiment 2

[0025] First, inject 2000mL of Fenton-treated wastewater into the reactor 1 through the exhaust port 2. The concentration of hydrogen peroxide before Fenton oxidation is 10mmol / L, and the total amount of hydrogen peroxide before the reaction of this volume of water sample is calculated to be 20mmol. Secondly, the magnetic stirring device 3 is turned on so that the wastewater is in a stirred state. Then open the nitrogen monoxide intake system 6, the nitrogen monoxide substance quality contained in the aeration rate per minute is 3.5 times of the hydrogen peroxide substance quality before oxidation in the water sample, and the aeration pressure is 90% of the bubble point pressure, and the aeration Gas time lasts 4h. Finally, turn off the nitrogen monoxide intake system 6, continue to stir for 20 minutes, and then take samples for the potassium dichromate method to determine the chemical oxygen demand (COD). cr determination.

Embodiment 3

[0027] First, inject 2000mL of Fenton-treated wastewater into the reactor 1 through the exhaust port 2. The concentration of hydrogen peroxide before Fenton oxidation is 10mmol / L, and the total amount of hydrogen peroxide before the reaction of this volume of water sample is calculated to be 20mmol. Secondly, the magnetic stirring device 3 is turned on so that the wastewater is in a stirring state. Then, open the nitric oxide intake system 6, the nitric oxide substance quality contained in the aeration rate per minute is 5 times of the hydrogen peroxide substance quality before oxidation in the water sample, and the aeration pressure is 95% of the bubble point pressure. Gas time lasts 6h. Finally, turn off the nitrogen monoxide intake system 6, and continue to maintain the state of stirring for 30 minutes, and then take samples for the potassium dichromate method to determine the chemical oxygen demand (COD). cr determination.

[0028] COD was carried out on the above-mentio...

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

No PUM Login to View More

Abstract

The invention provides a pretreatment device and method for wastewater before chemical oxygen demand detection. The pretreatment device comprises a reactor, a bubble-free aeration membrane component, an aeration pipe, a nitric oxide intake system, a magnetic rotor and a magnetic stirring device, wherein an exhaust port is formed in the top of the reactor; the built-in bubble-free aeration membrane component is connected with the nitric oxide intake system through the aeration pipe; the magnetic rotor is arranged at the center of the inner bottom of the reactor; the magnetic stirring device is arranged at the outer bottom of the reactor; the pretreatment method comprises the following steps: wastewater is injected into the reactor, the magnetic stirring device and the nitric oxide intake system are opened, the amount of nitric oxide in air aeration every minute is controlled to be 2-5 times that of hydrogen peroxide before Fenton oxidation, the aeration pressure is 85-95% of the bubble point pressure, the aeration time is 3-6 h, and after the reaction is finished, the stirring state is continuously maintained for 10-30 min, therefore the CODcr (chemical oxygen demand) can be measured through sampling. According to the pretreatment device and method for wastewater before chemical oxygen demand detection, provided by the invention, the interference of an oxidizing agent on the COD detection result of wastewater after Fenton treatment can be eliminated, the accuracy of the CODcr detection result can be improved, and the actual result of wastewater treatment can be reflected objectively and truly.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a pretreatment device and a pretreatment method before the detection of chemical oxygen demand (COD) of wastewater treated by Fenton. Background technique [0002] Chemical oxygen demand (COD) refers to the amount of oxidant consumed when a strong oxidant is used to treat water samples under certain conditions, and the result is converted into oxygen content (in mg / l). It is an important index to characterize the degree of wastewater pollution, and also a comprehensive index to characterize the pollution of reducing substances in water bodies. The potassium dichromate method is usually used to measure the chemical oxygen demand (COD cr ) to measure. [0003] Hydrogen peroxide (H 2 o 2 ) is a strong oxidizing substance, which is widely used in the advanced treatment of wastewater and the treatment of high-concentration refractory organic wastewater in the fo...

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
IPC IPC(8): G01N1/28G01N21/79
Inventor 胡绍伟
Owner ANGANG STEEL CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com