A system and method for three-dimensional electrocatalytic oxidation of liquid-solid fluidized bed for treating ammonia nitrogen wastewater

An ammonia nitrogen wastewater and catalytic oxidation technology, applied in the fields of chemical industry and environmental protection, can solve the problems of low mass transfer efficiency, heating of the tank, and high electrode cost, and achieve the effects of improving mass transfer efficiency, strengthening water quality circulation, and increasing electrode area.

Active Publication Date: 2022-07-26
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the presence of insulating porous plates will seriously affect the mass transfer of the electrolyte, and the performance of unipolar particle electrodes is generally lower than that of bipolar particle electrodes.
[0005] In summary, the electrocatalytic oxidation process has significant advantages in the treatment of ammonia nitrogen wastewater, but the current technology still has the problems of low mass transfer efficiency and high electrode cost.
The existing three-dimensional electrolysis technology presents significant technical superiority, but there are still some outstanding problems: (1) Fixed-bed three-dimensional electrolysis has particle electrode agglomeration and hardening, which affects the flow of electrolyte, current short circuit, and cell heating.
(2) Fluidized three-dimensional electrolysis has good mass transfer, but the particle electrode is easy to cause wear of the anode catalytic coating
The anode can be protected by adding porous separators or cloth bags, but there is a new problem of restricted anolyte flow
Moreover, the effect of unipolar particle electrodes is generally lower than that of bipolar three-dimensional particle electrodes.
(3) At present, the field of electrocatalytic oxidation treatment of ammonia nitrogen wastewater mainly focuses on the development of electrolytic cells, lacking systematic technology

Method used

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  • A system and method for three-dimensional electrocatalytic oxidation of liquid-solid fluidized bed for treating ammonia nitrogen wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] combine figure 1 , a liquid-solid fluidized bed three-dimensional electrocatalytic oxidation treatment system for ammonia nitrogen wastewater used in this embodiment, the system includes a filtering section 1, a spraying section 2, an electrocatalytic oxidation section 3 and a water quality adjustment section 4;

[0067] Filtration section 1 includes gravity settling tank 1-1, settling tank blowdown valve 1-2, filter inlet pump 1-3, filter 1-4 and filter blowdown valve 1-5;

[0068] The spray section 2 includes spray tower 2-1, spray tower drain valve 2-2, spray pump 2-3, catalyst tank 2-4, catalyst feed valve 2-5, catalyst feed pump 2-6 and Induced fan 2-7;

[0069] The electrocatalytic oxidation section 3 includes a DC power supply 3-1, an electrolytic cell feed pump 3-2, a plate-and-frame electrolytic cell 3-3, a fluidized bed electrolysis liquid inlet valve 3-4, a fluidized bed electrolytic cell 3-5, and a fluidized bed electrolytic cell 3-5. Bed electrolysis liqu...

Embodiment 2

[0077] This embodiment adopts the method for treating ammonia nitrogen wastewater by three-dimensional electrocatalytic oxidation of liquid-solid fluidized bed of the system described in Embodiment 1, which includes the following steps:

[0078] Ammonia nitrogen wastewater is sent to gravity settling tank 1-1, and after gravity settling, supernatant liquid and sludge are obtained; sludge is discharged through settling tank sewage valve 1-2 for treatment; supernatant liquid is sent to filter inlet pump 1-3 In the filter 1-4, the filtered clear liquid and the filtered sludge are obtained; the filtered sludge is discharged through the filter blowdown valve 1-5 for processing; the filtered clear liquid is sent to the spray tower 2-1; The catalyst is sequentially sent to the spray tower 2-1 through the catalyst feed valve 2-5 and the catalyst feed pump 2-6; the electrolytic gas generated by the electrocatalytic oxidation section 3 enters the spray tower 2-1 under the action of negat...

Embodiment 3

[0081] This example takes the printing and dyeing wastewater of a certain enterprise as the treatment object, and the treatment volume is 15m 3 / h, the initial value of ammonia nitrogen is 10000. In the spraying section 2, the catalyst is sodium chloride solution, and the catalyst addition amount is 2% of the quality of ammonia nitrogen wastewater. The plate-and-frame electrolytic cell 3-3 has a built-in porous diaphragm, graphite felts are arranged on both sides of the diaphragm, the water flow is in a parallel structure, and the current is in a series structure. In the plate-frame electrolytic cell 3-3, the anode adopts platinum ruthenium iridium tantalum tin antimony manganese coated titanium electrode; the cathode adopts titanium electrode; the distance between cathode and anode is 2mm; the anode current density is 800A / m 2 . The built-in electrode in the plate-frame electrolytic cell 3-3 adopts an integrated bipolar plate structure, and the coated titanium electrode ado...

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Abstract

The invention belongs to the fields of chemical industry and environmental protection. Specifically, the present invention discloses a system and method for three-dimensional electrocatalytic oxidation of liquid-solid fluidized bed for treating ammonia nitrogen wastewater. Pre-purification of wastewater is realized by removing suspended solids in ammonia nitrogen wastewater by gravity sedimentation and filtration. Through the spray treatment, the catalyst is fully mixed with the ammonia nitrogen wastewater, and the catalytic components in the electrolysis gas are effectively utilized. The efficient cracking of ammonia nitrogen in wastewater is realized by three-dimensional electrolysis of plate-frame electrolysis coupled with fluidized bed. By adding chemicals to adjust the acidity and alkalinity of water, the discharge can be achieved. The three-dimensional electrode diaphragm structure is adopted in the plate-frame electrolysis, and the reaction area is greatly increased by adding graphite felt and carbon felt. At the same time, the current in series and the water flow in parallel are used to strengthen the water quality circulation, improve the mass transfer efficiency, and promote the decomposition of ammonia nitrogen.

Description

technical field [0001] The invention belongs to the fields of chemical industry and environmental protection, and particularly relates to a system and a method for treating ammonia nitrogen wastewater by three-dimensional electrocatalytic oxidation in a liquid-solid fluidized bed. Background technique [0002] In 2019, China's GDP reached 99 trillion yuan, an increase of about 58 times compared to 30 years ago. Behind the rapid economic growth, the output of heavy industries such as chemical industry, metallurgy, coal, cement, and caustic soda has exceeded more than 50% of the global output. In order to maintain a healthy balance of the ecosystem, it is necessary to force the treatment of pollutants. The ammonia nitrogen wastewater involved in this patent is a very typical type of pollutant. [0003] Ammonia nitrogen wastewater is widely found in many industrial fields, including textile, pharmaceutical, pesticide, tanning, petroleum, chemical, coal, metallurgy and other f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F101/16C02F101/38
CPCC02F9/00C02F1/001C02F2001/007C02F1/4672C02F1/66C02F2101/16C02F2101/38
Inventor 杨海涛朱庆山张英志
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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