Device for decomplexation and enhanced removal of copper based on self-induced fenton-like reaction constructed by electrochemistry coupled with membrane separation, and use thereof

Abstract

A device for decomplexation and enhanced removal of copper based on self-induced Fenton-like reaction constructed by electrochemistry coupled with membrane separation is disclosed. The device includes a reactor, two electrocatalytic anodes capable of generating hydroxyl radicals, an electrocatalytic cathode membrane assembly, a direct current power supply, an aeration system, an inlet pipe and an outlet pipe. The device of the present invention has a simple construction. Using this device to treat industrial wastewater containing copper complexes under specific conditions allows the decomplexation and the removal of the industrial wastewater containing the copper complexes to be simultaneously realized at a low consumption and a high efficiency. The coupling of electrochemistry with membrane separation can be achieved to protect the cathode from being contaminated by pollutants in the sewage and prolong the service life of the electrode.

Claims

1. A device for decomplexation and enhanced removal of copper based on a self-induced Fenton-like reaction constructed by electrochemistry coupled with membrane separation, comprising a reactor, two electrocatalytic anodes, an electrocatalytic cathode membrane assembly, a direct current power supply, an aeration system, an inlet pipe, and a first outlet pipe; wherein the two electrocatalytic anodes generate hydroxyl radicals, wherein each of the two electrocatalytic anodes is one selected from the group consisting of an activated carbon fiber felt and a metal oxide active electrode, the two electrocatalytic anodes and the electrocatalytic cathode membrane assembly are both located in the reactor, the two electrocatalytic anodes are connected to a positive pole of the direct current power supply via a first wire, and the electrocatalytic cathode membrane assembly is located between the two electrocatalytic anodes, wherein the electrocatalytic cathode membrane assembly comprises a membrane bracket, a composite conductive microfiltration membrane and a second outlet pipe, wherein the composite conductive microfiltration membrane is prepared by placing a titanium wire mesh on a non-woven fabric, and knife coating a casting solution on the titanium wire mesh for a phase inversion, the composite conductive microfiltration membrane is embedded with the titanium wire mesh, and the composite conductive microfiltration membrane has a membrane pore size of 0.1-0.4 μm, the composite conductive microfiltration membrane is attached on both sides of the membrane bracket, the composite conductive microfiltration membrane is connected to a negative pole of the direct current power supply via a second wire, and the membrane bracket has an inner cavity in communication with the second outlet pipe through a suction port provided on the membrane bracket, wherein the aeration system comprises an aeration tube, a flow meter, and an air pump, the aeration tube is located below the electrocatalytic cathode membrane assembly, and the flow meter is configured to regulate a flow rate of intake air, wherein the inlet pipe is in communication with a water inlet provided in an upper portion of the reactor, and a water inlet pump is provided on the inlet pipe, and wherein the first outlet pipe is in communication with a water outlet of the second outlet pipe, and a water outlet pump is provided on the first outlet pipe.

2. A method of using the device according to claim 1 in a treatment of industrial wastewater containing copper complexes, wherein the industrial wastewater contains copper ions with a concentration of 1-32 mg/L and the copper complexes with a concentration of 0-0.5 mM at a pH of 3-7, and the method comprises the following steps: (1) allowing the industrial wastewater to enter the reactor through the inlet pipe and the water inlet under an action of the water inlet pump; (2) turning on the air pump, and adjusting the flow meter to aerate air into the reactor through the aeration tube; (3) switching on the direct current power supply for an electrolysis at a voltage controlled to 1.5-4 V for a time period of 1.5-2.5 hours; and (4) turning on the water outlet pump to withdraw the industrial wastewater in the reactor through the electrocatalytic cathode membrane assembly.

3. The method according to claim 2, wherein in step (2), the aeration tube has an aeration flow rate of 0.3 L/min.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIGURE shows a schematic structural diagram of the reaction device of the present invention.

REFERENCE NUMERALS

(2) 1. flow meter; 2. air pump; 3. electrocatalytic anode; 4. electrocatalytic cathode membrane assembly; 5. reactor; 61. water inlet pump; 62. water outlet pump; 7. aeration tube; 8. composite conductive microfiltration membrane; 9. membrane bracket; 10. outlet pipe of membrane assembly; 11. wire; and 12. direct current power supply.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(3) The features of the present invention are further described below with reference to examples, which do not limit the claims of the present invention in any way.

EXAMPLE 1

(4) As shown in the FIGURE, a device for decomplexation and enhanced removal of copper based on a self-induced Fenton-like reaction constructed by electrochemistry coupled with membrane separation includes the reactor 5, two electrocatalytic anodes 3, the electrocatalytic cathode membrane assembly 4, the direct current power supply 12, an aeration system, an inlet pipe and an outlet pipe. The electrocatalytic anodes 3 and the electrocatalytic cathode membrane assembly 4 are both located in the reactor 6, the electrocatalytic anodes 3 are graphite plates (size: 7 cm×10 cm), the electrocatalytic anodes 3 are connected to a positive pole of the direct current power supply 12 via the wire 11, and the electrocatalytic cathode membrane assembly 4 is located between the two electrocatalytic anodes 3. The electrocatalytic cathode membrane assembly 4 includes the membrane bracket 9, the composite conductive microfiltration membrane 8 and the outlet pipe 10 of membrane assembly. The composite conductive microfiltration membrane 8 (size: 7 cm×10 cm; pore size: 0.14 μm) is attached on both sides of the membrane bracket 9, and the composite conductive microfiltration membrane 8 is connected to a negative pole of the direct current power supply 12 via the wire 11. The composite conductive microfiltration membrane 8 is a titanium wire mesh embedded composite conductive microfiltration membrane prepared by first placing the titanium wire mesh on a non-woven fabric, and then knife coating a casting solution on the titanium wire mesh for phase inversion. The membrane bracket 9 has an inner cavity in communication with the outlet pipe 10 of membrane assembly through a suction port provided on the membrane bracket 9. The aeration system includes the aeration tube 7, the flow meter 1 and the air pump 2, the aeration tube 7 is located below the electrocatalytic cathode membrane assembly 4, and the flow meter 1 is configured to regulate the flow rate of intake air. The inlet pipe is in communication with a water inlet provided in an upper portion of the reactor, and the water inlet pump 61 is provided on the inlet pipe. The outlet pipe is in communication with a water outlet of the outlet pipe 10 of membrane assembly, and the water outlet pump 62 is provided on the outlet pipe.

(5) The above-mentioned device is used to treat industrial wastewater containing copper complexes by a method including the following steps.

(6) (1) The industrial wastewater containing the copper complexes is allowed to enter the reactor through the inlet pipe and the water inlet under the action of the water inlet pump, wherein the reactor has an effective volume of 714 mL and a hydraulic retention time of 2.5 hours.

(7) (2) The air pump is turned on, and the flow meter is adjusted to aerate air into the reactor through the aeration tube, wherein the aeration tube has an aeration flow rate of 0.3 L/min.

(8) (3) The direct current power supply is switched on for an electrolysis at a voltage controlled to 3 V for a time period of 2.5 hours.

(9) (4) The water outlet pump is turned on to withdraw the industrial wastewater in the reactor through the membrane assembly.

(10) After the industrial wastewater containing the copper complexes (the wastewater contains copper ions with a concentration of 32 mg/L and the copper complexes with a concentration of 0.5 mM at a pH of 4) is treated by the above-mentioned method, the decomplexation rate of the copper complexes in the wastewater is 84% and the removal rate of the copper ions is 76%.

EXAMPLE 2

(11) The same device for decomplexation and enhanced removal of copper as in Example 1 is used to treat industrial wastewater containing copper complexes by a method including the following steps.

(12) (1) The industrial wastewater containing the copper complexes is allowed to enter the reactor through the inlet pipe and the water inlet under the action of the water inlet pump, wherein the reactor has an effective volume of 714 mL and a hydraulic retention time of 2.5 hours.

(13) (2) The air pump is turned on, and the flow meter is adjusted to aerate air into the reactor through the aeration tube, wherein the aeration tube has an aeration flow rate of 0.3 L/min.

(14) (3) The direct current power supply is switched on for an electrolysis at a voltage controlled to 3.5 V for a time period of 2.5 hours.

(15) (4) The water outlet pump is turned on to withdraw the industrial wastewater in the reactor through the membrane assembly.

(16) After the industrial wastewater containing the copper complexes (the wastewater contains copper ions with a concentration of 32 mg/L and the copper complexes with a concentration of 0.5 mM at a pH of 4) is treated by the above-mentioned method, the decomplexation rate of the copper complexes in the wastewater is 84% and the removal rate of the copper ions is 76%.

EXAMPLE 3

(17) The same device for decomplexation and enhanced removal of copper as in Example 1 is used to treat industrial wastewater containing copper complexes by a method including the following steps.

(18) (1) The industrial wastewater containing the copper complexes is allowed to enter the reactor through the inlet pipe and the water inlet under the action of the water inlet pump, wherein the reactor has an effective volume of 714 mL and a hydraulic retention time of 2.5 hours.

(19) (2) The air pump is turned on, and the flow meter is adjusted to aerate air into the reactor through the aeration tube, wherein the aeration tube has an aeration flow rate of 0.3 L/min.

(20) (3) The direct current power supply is switched on for an electrolysis at a voltage controlled to 4 V for a time period of 2.5 hours.

(21) (4) The water outlet pump is turned on to withdraw the industrial wastewater in the reactor through the membrane assembly.

(22) After the industrial wastewater containing the copper complexes (the wastewater contains copper ions with a concentration of 32 mg/L and the copper complexes with a concentration of 0.5 mM at a pH of 4) is treated by the above-mentioned method, the decomplexation rate of the copper complexes in the wastewater is 84% and the removal rate of the copper ions is 81%.

(23) For the purposes of promoting an understanding of the principles of the invention, specific embodiments have been described. It should nevertheless be understood that the description is intended to be illustrative and not restrictive in character, and that no limitation of the scope of the invention is intended. Any alterations and further modifications in the described components, elements, processes or devices, and any further applications of the principles of the invention as described herein, are contemplated as would normally occur to one skilled in the art to which the invention pertains.