System and method for treating ammonia-nitrogen wastewater through liquid-solid fluidized bed three-dimensional electrocatalytic oxidation

A technology of ammonia nitrogen wastewater and catalytic oxidation, which is applied in chemical instruments and methods, filtration treatment, precipitation treatment, etc., can solve problems affecting electrolyte mass transfer, cell heating, current short circuit, etc., achieve pollution-free economy, and improve electrode quality. Area, efficient decomposition and removal effect

Active Publication Date: 2021-07-13
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • System and method for treating ammonia-nitrogen wastewater through liquid-solid fluidized bed three-dimensional electrocatalytic oxidation

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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] 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 draft fan 2-7;

[0069] Electrocatalytic oxidation section 3 includes DC power supply 3-1, electrolyzer feed water pump 3-2, plate and frame electrolyzer 3-3, fluidized bed electrolytic liquid inlet valve 3-4, fluidized bed electrolyzer 3-5, fluidized Bed electrolysis outlet valve 3-6, gas-liquid separation tank 3-7 and separa...

Embodiment 2

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

[0078] 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 drain valve 1-5 and sent for processing; the filtered clear liquid is sent into the spray tower 2-1; the filtered sludge in the catalyst tank 2-4 The catalyst is sent into the spray tower 2-1 through the catalyst feeding valve 2-5 and the catalyst feeding pump 2-6 in sequence; the electrolytic gas generated in the electro...

Embodiment 3

[0081] 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 plate and frame electrolytic cell 3-3 has a built-in porous diaphragm, and graphite felt is arranged on both sides of the diaphragm, the water flow 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 structur...

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Abstract

The invention belongs to the fields of chemical engineering and environmental protection. Specifically, the invention discloses a system and a method for treating ammonia-nitrogen wastewater through liquid-solid fluidized bed three-dimensional electrocatalytic oxidation. Suspended solids in the ammonia-nitrogen wastewater are removed through gravity settling and filtering, and pre-purification of the wastewater is achieved. Through spraying treatment, the catalyst and the ammonia-nitrogen wastewater are fully mixed, and catalytic components in electrolytic gas are effectively utilized. And efficient cracking of ammonia nitrogen in the wastewater is realized through plate and frame electrolysis coupled fluidized bed three-dimensional electrolysis. The acid-base property of water is adjusted by adding medicaments, so that up-to-standard discharge is realized and a three-dimensional electrode diaphragm structure is adopted in plate frame electrolysis, the reaction area is greatly increased by adding graphite felts and carbon felts, and meanwhile, the water circulation is enhanced, the mass transfer efficiency is improved, and the decomposition of ammonia nitrogen is promoted by adopting a current series connection and water flow parallel connection mode.

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 electrocatalytic oxidation treatment of ammonia nitrogen wastewater 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 50% of the world's total. In order to maintain a benign balance of the ecosystem, it is necessary to artificially and compulsively deal with pollutants. The ammonia nitrogen wastewater involved in this patent is a very typical class of pollutants. [0003] Ammonia nitrogen wastewater widely exists in many industrial fields, including textile, pharmaceutical, pesticide, leather, petroleum, chemical, coal, metallurgy and o...

Claims

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Application Information

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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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