Method for electrochemically coordinating persulfate to remove organic pollutants in wastewater

A technology for organic pollutants and persulfate, applied in water pollutants, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of long-term supply, reduction of cathode electrode current density, low oxidant use efficiency, etc. To achieve the effect of short response time, low consumption and low current

Active Publication Date: 2018-11-02
HUAZHONG UNIV OF SCI & TECH
View PDF5 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For the above defects or improvement needs of the prior art, the object of the present invention is to provide a method for electrochemically synergistic persulfate removal of organic pollutants in wastewater. Improvement of the key reaction parameters (reducing the current density of the cathode electrode), so that organic pollutants (especially monohydric phenols, hydrocarbyl substitutions of monohydric phenols, halides of monohydric phenols, aniline, etc.) in this relatively milder oxidation environment It is more inclined to polymerize in the cathode chamber to generate solid precipitates rather than being completely oxidized and decomposed into small molecular organic matter, and the pu...

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
  • Method for electrochemically coordinating persulfate to remove organic pollutants in wastewater
  • Method for electrochemically coordinating persulfate to remove organic pollutants in wastewater
  • Method for electrochemically coordinating persulfate to remove organic pollutants in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Contrasting (1) anode / PDS / Fe in this embodiment 3+ , (2) anode / cathode / PDS / Fe 3+ and (3) Cathode / PDS / Fe 3+ The removal effect of phenol in aqueous solution. The results showed that after 2 hours of reaction, the phenol in (1) did not polymerize and was almost not removed; while (2) and (3) had basically the same effect, and both phenol polymerized to form a black solid precipitate. After solid-liquid separation, almost Phenol can be completely removed. This example demonstrates that the anode is essentially ineffective under these conditions and it is primarily the cathode that does the work. The detailed operating conditions are as follows:

[0046] Operating conditions:

[0047] Anode: a 2cm*2cm platinum plate electrode

[0048] Cathode: two 2cm*2cm platinum plate electrodes connected in parallel

[0049] Phenol solution concentration: 1mmol / L

[0050] Phenol solution volume: 100mL

[0051] Sulfate: 50mmol / L sodium sulfate

[0052] Anolyte volume: 100mL

[...

Embodiment 2

[0060] In this example, (1) cathode, (2) cathode / PDS, (3) cathode / Fe 3+ 、 (4)PDS / Fe 3+ And (3) cathode / PDS / Fe in embodiment 1 3+ The removal effect of phenol in aqueous solution. The results show that (1) (2) (3) (4) phenol does not polymerize within 2 hours and cannot be removed substantially. In Example 1 (3) cathode / PDS / Fe 3+ The polymerization of phenol produces a black solid precipitate, which can be almost completely removed after solid-liquid separation. This example illustrates that in Example 1 (3) cathode / PDS / Fe 3+ What works in the system is the whole system, and the medicines added are indispensable. The detailed operating conditions are as follows:

[0061] (1) Separate cathode

[0062] Anode: a 2cm*2cm platinum plate electrode

[0063] Cathode: two 2cm*2cm platinum plate electrodes connected in parallel

[0064] Phenol solution concentration: 1mmol / L

[0065] Phenol solution volume: 100mL

[0066] Sulfate: 50mmol / L sodium sulfate

[0067] Anolyte volum...

Embodiment 3

[0105] In this example, the influence of different amounts of PDS on the removal of phenol in the aqueous solution is compared. The dosage of PDS is respectively 5, 7.5, 10, 15, 20mmol / L, and all the other reaction conditions are the same as those in Example 1 (3) cathode / PDS / Fe 3+ unanimous. The results showed that the more PDS was added, the more phenol was polymerized, the better the removal effect, and the reduction of PDS was basically the same (5 mmol / L within 2 hours), indicating that there was no need to add too much PDS during the reaction.

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 discloses a method for electrochemically coordinating persulfate to remove organic pollutants in wastewater. The method comprises the following steps: separating cathode liquor from anode liquor through a salt bridge or a proton membrane, wherein the cathode liquor is prepared from persulfate, transition metal ions and wastewater containing the organic pollutants; then adjusting a pHvalue of the cathode liquor to 0 to 10 and electrifying to treat for 0.5 to 12 hours under low current density after stirring; performing solid-liquid separation on the cathode liquor and separatingto obtain the liquid, namely wastewater with the organic pollutants removed. According to the method disclosed by the invention, the organic pollutants can polymerize to form solid precipitate in an electrolytic process of a cathode chamber; after reaction is finished, solid-liquid separation is performed on reaction liquid; thus, target organic pollutants, COD and TOC in the wastewater can be effectively removed; meanwhile, the method has the advantages of high efficiency, energy conservation, simpleness and convenience in operation and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a method for removing organic pollutants in wastewater by electrochemical cooperation with persulfate. Background technique [0002] With the rapid development of oil refining, petrochemical, coking, phenolic resin, medicine, pesticide and other industries, the amount of organic wastewater produced is also increasing year by year. This type of wastewater generally has the characteristics of high concentration and high toxicity, so it is not suitable to be directly treated by traditional biological methods. OH and SO produced by advanced oxidation technology 4 - Highly active free radicals can undergo electron transfer, hydrogen abstraction and addition reactions with organic pollutants, thereby decomposing them into biodegradable small molecular organic compounds or being completely mineralized, so it is an effective treatment for this type of wastewater...

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): C02F1/461C02F101/34C02F101/36C02F101/38
CPCC02F1/46104C02F1/46109C02F2001/46133C02F2101/34C02F2101/345C02F2101/36C02F2101/38C02F2201/461
Inventor 崔玉虹赖辉辉杨岁芹刘正乾
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap