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Electrochemical reaction device and method for synchronously removing total nitrogen in electroplating wastewater

A chemical reaction and electroplating wastewater technology, applied in the field of electrochemistry, can solve the problems of long total processing time and high energy consumption, and achieve the effects of fast speed, simple and reasonable device structure design, and easy operation

Active Publication Date: 2020-05-08
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the different chemical reaction rates of the cathode and anode, the electrochemical reaction is used for the removal of total nitrogen in electroplating wastewater, and the anodic oxidation to remove ammonia nitrogen and organic nitrogen and the cathode reduction to remove nitrate nitrogen cannot be completed simultaneously, resulting in a long total treatment time. , high energy consumption

Method used

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  • Electrochemical reaction device and method for synchronously removing total nitrogen in electroplating wastewater
  • Electrochemical reaction device and method for synchronously removing total nitrogen in electroplating wastewater
  • Electrochemical reaction device and method for synchronously removing total nitrogen in electroplating wastewater

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Experimental program
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Effect test

Embodiment 1

[0081] The cathode is connected to the negative pole of the power supply with three-dimensional nitrogen-doped carbon-loaded foam copper, the anode is connected to the positive pole of the power supply with a titanium ruthenium grid, and the cathode plate and the anode plate are placed at intervals (see attached figure 1 ), the ratio is cathode: anode = 2:1 (4 cathode plates, 2 anode plates), and the distance between the plates is 5mm. Turn on the power, and the hydraulic retention time is 3 hours.

[0082] Influent water quality: initial pH=6.78, conductivity=13.88ms / cm, dissolved oxygen (DO)=12.26mg / L, COD=214mg / L, nitrate nitrogen=80mg / L, ammonia nitrogen=160mg / L, total nitrogen =300mg / L, the current density is set to 5mA / cm 2 .

[0083] After being treated by the electrochemical synchronous denitrification reactor, the nitrate nitrogen is 7.5mg / L, the ammonia nitrogen is 0mg / L, the total nitrogen is 14mg / L, and the total nitrogen removal rate is 95.33%.

Embodiment 2

[0085] The cathode is connected to the negative pole of the power supply with three-dimensional nitrogen-doped carbon-loaded foam copper, the anode is connected to the positive pole of the power supply with a titanium ruthenium grid, and the cathode plate and the anode plate are placed at intervals (see attached figure 1 ), the ratio is cathode: anode = 2:1 (4 cathode plates, 2 anode plates), and the distance between the plates is 5mm. Turn on the power, and the hydraulic retention time is 3 hours.

[0086] Influent water quality: initial pH=6.78, conductivity=13.88ms / cm, dissolved oxygen (DO)=12.26mg / L, COD=214mg / L, nitrate nitrogen=80mg / L, ammonia nitrogen=160mg / L, total nitrogen =300mg / L, the current density is set to 10mA / cm 2 .

[0087] After being treated by the electrochemical synchronous denitrification reactor, the nitrate nitrogen is 4.5mg / L, the ammonia nitrogen is 0mg / L, the total nitrogen is 6.0mg / L, and the total nitrogen removal rate is 98%.

Embodiment 3

[0089]The cathode is connected to the negative electrode of the power supply with three-dimensional nitrogen-doped carbon-loaded foam copper, and the anode is connected to the positive electrode of the power supply with a titanium ruthenium grid. The cathode plate and the anode plate are placed at intervals. According to the low ratio of nitrate nitrogen in the influent, the ratio of the cathode to the anode is adjusted to the cathode: anode = 1:1 (2 cathode plates, 2 anode plates), the distance between the plates is 5mm. Turn on the power, and the hydraulic retention time is 3 hours.

[0090] Influent water quality: initial pH=6.78, conductivity=13.88ms / cm, dissolved oxygen (DO)=12.26mg / L, COD=214mg / L, nitrate nitrogen=35mg / L, ammonia nitrogen=200mg / L, total nitrogen =300mg / L; current density is set to 5mA / cm 2 .

[0091] After being treated by the electrochemical synchronous denitrification reactor, the nitrate nitrogen is 2.5mg / L, the ammonia nitrogen is 0mg / L, the total ...

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Abstract

The invention provides an electrochemical reaction device and method for synchronously removing total nitrogen in electroplating wastewater, and belongs to the technical field of electrochemistry. Theelectrochemical reaction device comprises a reactor, at least one cathode plate arranged in the reactor and at least one anode plate arranged in the reactor; the cathode plate and the anode plate areconnected with an external direct-current power supply; and the anode plates and the cathode plates are correspondingly increased or decreased according to the concentrations of ammonia nitrogen andorganic nitrogen in the electroplating wastewater to be treated, the anodic oxidation reaction rate, the concentration of nitrate nitrogen and the cathodic reduction reaction rate. The electrochemicalreaction device for synchronously removing the total nitrogen in the electroplating wastewater is mainly applied to the field of electroplating wastewater, the total nitrogen removal rate can reach 99%, energy and time are saved, and the electrochemical reaction device is not affected by electroplating wastewater concentration, water quality fluctuation, heavy metal poisoning, salt content and the like.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, in particular to an electrochemical reaction device and method for synchronously removing total nitrogen in electroplating wastewater. Background technique [0002] With the rapid development of my country's industrialization, electroplating, as an intermediate supporting link technology, is widely used in machinery manufacturing, electronics and other industries. However, during the electroplating process, electroplating waste water such as waste bath solution and plated piece cleaning water will be generated, which will cause serious environmental pollution if not effectively treated. [0003] Due to the difference in process and plating types, electroplating wastewater has more complex components, and the problem of nitrogen pollution is more prominent. Nitrogen in electroplating wastewater mainly exists in the form of nitrate nitrogen, ammonia nitrogen and organic nitrogen. In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/467C02F1/72C02F101/16C02F101/38C02F103/16
CPCC02F1/461C02F1/46104C02F1/4672C02F1/4676C02F1/72C02F2101/16C02F2101/38C02F2103/16
Inventor 冒冉孙拓朱海洋赵旭
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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