Method for conducting dynamic three-dimensional electro-catalysis and purification on dyeing wastewater through nanometer microbubbles

A technology of nano-microbubbles and catalytic purification, applied in electrochemical water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc. Taking advantage of the mass transfer efficiency of the reactor and the insufficient hydraulic exchange between the electrode and the sewage to be treated, it achieves the effects of outstanding electrocatalytic activity, good heat resistance, and a small footprint

Active Publication Date: 2016-09-21
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

Invention patent CN201510130160.2 discloses a three-dimensional electrode electrolysis method for treating high-concentration ammonia-nitrogen wastewater. In the three-dimensional electrode electrolysis device, the particle electrodes used are particles made of iron-based catalysts filled between the cathode and anode plates. However, the iron catalyst is easily lost through the micro-electrolysis process in water, and may cause unnecessary impact on water quality due to the formation of iron ions; the invention patent CN201210031699.9 discloses a method of combining three-dimensional electrodes and photocatalysis for water sterilization. The three-dimensional electrode filler used in it is one or both of activated carbon or iron filings, but it has not been fluidized, so the direct hydraulic exchange between the electrode and the sewage to be treated is not sufficient, and when the concentration of suspended particles in the sewage is high , easy to cause blockage; invention patent CN201310450484.5 discloses a method of using three-dimensional electrodes to treat phenol wastewater, using conductive adhesive to mix activated carbon and glass beads into a regular shape according to the mass ratio, and making a three-dimensional electrode to strengthen the treatment of phenol wastewater Effect, the process is relatively complicated, and because activated carbon has a strong adsorption effect, it is easy to adsorb a large amount of pollutants to form concentration polarization, and it is difficult to effectively use the electric field advantages of the three-dimensional electrode micro-electrolytic cell
In short, the existing three-dimensional electrocatalytic technology still has many defects, and it is difficult to realize the full utilization of electric energy and take into account the mass transfer efficiency in the reactor.

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  • Method for conducting dynamic three-dimensional electro-catalysis and purification on dyeing wastewater through nanometer microbubbles

Examples

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Effect test

no. 1 example

[0031] Such as figure 1 As shown, a method for purifying printing and dyeing sewage with dynamic three-dimensional electrocatalysis of nano-microbubbles, the reaction device is composed as follows: the anode (1) and the cathode (2) are placed in the electrolytic cell, and are respectively connected to the positive and negative poles of the DC power supply through wires Titanium oxide particles (3) are placed in the electrolytic cell, and can be attached to the surface of the bubbles to form a microbubble emulsion under aeration conditions, and one side of the bottom of the electrolytic cell is connected with the nano-microbubble aeration device (5), and through The head (6) aerates the wastewater, and the other side is provided with a microfiltration head (7), so that the titanium oxide nanoparticles (4) can be separated from the water phase smoothly after the reaction.

no. 2 example

[0033] A certain printing and dyeing wastewater is treated with the reaction device described in the first embodiment. The water quality parameters of the wastewater are: SS 68.7mg / L, pH value 3.5, conductivity 800μs / cm, COD Cr 278mg / L, N-NH 3 31.2mg / L, chromaticity 50.

[0034]First, remove the suspended particles in the wastewater by sand filtration, reduce its SS value to 45mg / L, adjust the pH value to approximately equal to 7 with sodium hydroxide, and add an appropriate amount of sodium sulfate to make the conductivity of the printing and dyeing wastewater 1200μs / cm. Perform aeration treatment to fully mix the printing and dyeing wastewater with the electrolyte, and add it to the electrolytic cell with an inert form-stable electrode as the anode and a stainless steel plate as the cathode, add 500mg / L titanium dioxide particles to the electrolytic cell, and start nano-microbubble aeration The device pre-oxygenates the printing and dyeing wastewater through the lower aerat...

no. 3 example

[0036] A certain printing and dyeing wastewater is treated with the reaction device described in the first embodiment. The water quality parameters of the wastewater are: SS 125mg / L, pH value 4.7, conductivity 725μs / cm, COD Cr 306mg / L, N-NH 3 10.4mg / L, chromaticity 25.

[0037] The dosage of titanium dioxide particles in the electrocatalysis process is 700mg / L, and the electrocatalytic current density is 12.5mA / cm 2 , the rest of the process and conditions are the same as those in Embodiment 2, and will not be repeated here.

[0038] After 40 minutes of electrocatalytic treatment, the effluent quality is as follows: SS 5.7mg / L, pH 5.0, conductivity 216μs / cm, COD Cr 22.2mg / L, N-NH 3 1.2mg / L, color 5.

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Abstract

The invention relates to the technical field of electro-catalytic industrial wastewater treatment, in particular to a method for conducting dynamic three-dimensional electro-catalysis and purification on dyeing wastewater through nanometer microbubbles. The method comprises the steps that pretreatment such as sand filtration, pH value and electric conductivity adjusting and aeration treatment is conducted on the dyeing wastewater, the treated dyeing wastewater is added into an electrolytic tank taking a noble electrode as an anode and taking a stainless steel plate as a cathode, a certain amount of titanium sub-oxide particles is added, a nanometer microbubble aerating device is started for aeration, electro-catalytic oxidation treatment is conducted on the dyeing wastewater for 30 min to 2 h through energizing till the dyeing wastewater is completely decolored and decomposed, and titanium sub-oxide nanoparticles are separated and filtered out through a microfiltration head. According to the method for conducting dynamic three-dimensional electro-catalysis and purification on the dyeing wastewater through the nanometer microbubbles, the problems that in a traditional filled immobilized three-dimensional electrode, hydraulic exchange is insufficient, an electrode short-circuit current is too large, secondary contamination may be caused are eliminated, and positive significance on treating the dyeing wastewater is achieved.

Description

technical field [0001] The invention relates to the technical field of electrochemical industrial wastewater treatment, in particular to a method for purifying printing and dyeing sewage by dynamic three-dimensional electrocatalysis of nano microbubbles. Background technique [0002] Printing and dyeing wastewater is industrial wastewater discharged from printing and dyeing factories that process textile products such as cotton, hemp, and chemical fibers. The printing and dyeing industry consumes a lot of water. It takes nearly 100 tons of water to process one ton of textiles, most of which cannot be recycled and become industrial wastewater. The content of organic pollutants in textile printing and dyeing wastewater is high and alkaline, especially the pollutants such as pulp, auxiliaries, dyes, oil agents, acids and bases, fiber impurities, particles, inorganic salts, etc., have stable chemical properties and can be biochemically It is a typical refractory organic industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/46C02F1/72C02F103/30
CPCC02F1/001C02F1/4672C02F1/66C02F7/00C02F9/00C02F2103/30
Inventor 殷立峰代云容牛军峰谢利利张园正
Owner BEIJING NORMAL UNIVERSITY
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