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A system and method for three-dimensional electrolytic removal of ammonia nitrogen in a liquid-solid fluidized bed to realize wastewater reuse

A fluidized bed and three-dimensional electric technology, which is applied in the fields of chemical industry and environmental protection, can solve the problems of particle electrode anode catalytic coating wear, low performance of unipolar particle electrodes, low effect of unipolar particle electrodes, etc., and achieve pollution-free economy properties, promoting decomposition, and inhibiting wear

Active Publication Date: 2022-03-08
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • 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 electrolytic removal of ammonia nitrogen in a liquid-solid fluidized bed to realize wastewater reuse

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Effect test

Embodiment 1

[0066] combine figure 1 , a liquid-solid fluidized bed three-dimensional electrolytic ammonia nitrogen removal system used in this embodiment to realize wastewater reuse, including a filtering section 1, a spraying section 2, an electrolysis 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] 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, Induced fan 2-7 and spray tower feed pump 2-8;

[0069] Electrolysis section 3 includes DC power supply 3-1, electrolyzer feed pump 3-2, plate and frame electrolyzer 3-3, fluidized bed electrolysis inlet valve 3-4, fluidized bed electrolyzer 3-5, fluidized bed electrolyzer Liquid outlet valve 3-6, gas-liquid separation tank 3-7 and separation tank drain valve 3-8;...

Embodiment 2

[0078] In this embodiment, the method of removing ammonia nitrogen by three-dimensional electrolysis of the liquid-solid fluidized bed described in Embodiment 1 to realize the reuse of wastewater includes the following steps:

[0079] The ammonia nitrogen waste water is sent to the gravity settling tank 1-1, and after gravity settling, the supernatant and sludge are obtained; the sludge is discharged through the settling tank blowdown valve 1-2 and sent for treatment; the supernatant is sent in through the filter inlet pump 1-3 In the filter 1-4, the filtered clear liquid and filtered sludge are obtained; the filtered sludge is discharged through the filter sewage valve 1-5 and sent for processing; a part of the filtered clear liquid is sent to the spray tower 2 through the spray tower feeding pump 2-8 -1; another part of the filtered clear liquid is sent into the regulating tank 4-2 through the raw water pump 4-4 of the regulating tank; the catalyst in the catalyst tank 2-4 pa...

Embodiment 3

[0082] In this embodiment, the printing and dyeing wastewater of a certain enterprise is used as the treatment object, and the treatment capacity is 15m 3 / h, the initial value of ammonia nitrogen is 10000. In the spraying section 2, the catalyst is a sodium chloride solution, and the amount of the catalyst added is 2% of the mass of the ammonia nitrogen wastewater. The water flow in the plate and frame electrolyzer 3-3 is in parallel structure, and the current is in series structure. The anode in the plate and frame electrolytic cell 3-3 is a titanium electrode coated with platinum, ruthenium, iridium, tantalum, tin, antimony and manganese; the cathode is a titanium electrode; the distance between the anode and cathode is 2mm; the current density of the anode 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 adopts a single-sided active coating. In the fluidized bed ...

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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 electrolytic removal of ammonia nitrogen in a liquid-solid fluidized bed to realize wastewater reuse. The suspended solids in ammonia nitrogen wastewater are removed by gravity settling and filtration to realize wastewater pre-purification. Through spraying treatment, the catalyst and ammonia nitrogen wastewater are fully mixed, and the catalytic components in the electrolysis gas are effectively used. High-efficiency cracking of ammonia-nitrogen in wastewater was realized by three-dimensional electrolysis coupled with plate-frame electrolysis and fluidized bed. By using the raw water from the outlet of the filter to adjust the acidity and alkalinity of the electrolyzed solution, the waste water can be reused. In the plate and frame electrolysis, the integrated bipolar plate structure is adopted to improve the material utilization efficiency. At the same time, the current series connection and the water flow parallel connection method are adopted 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 in particular relates to a system and method for three-dimensional electrolytic removal of ammonia nitrogen in a liquid-solid fluidized bed to realize wastewater reuse. 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 50% of the world's total. These industries all have the characteristics of high energy consumption and heavy pollution. In other words, nearly 50% of the world's annual pollutant emissions remain in China. A large amount of pollutant discharge far exceeds the self-metabolizing capacity of the environment, leading to ecological imbalance. In order to maintain a benign balance of the ecosystem, it is necessary to artific...

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 朱庆山杨海涛张英志
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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