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

A technology of organic wastewater and fluidized bed, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc. It can solve the problems of affecting the mass transfer of electrolyte, high electrode cost, and heating of the tank, so as to achieve no pollution Economical, improved cracking efficiency, efficient decomposition and removal effect

Active Publication Date: 2022-05-03
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 treating organic 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 organic wastewater mainly focuses on the development of electrolyzers, lacking systematic organic wastewater reuse technology
(4) Organic wastewater is generally acidic after electrolytic treatment, and it is directly reused, which is likely to cause equipment corrosion

Method used

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  • A system and method for three-dimensional electrolytic removal of organic matter in a liquid-solid fluidized bed to realize the reuse of organic wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0067] combine figure 1 , a liquid-solid fluidized bed three-dimensional electrolytic removal of organic matter used in this embodiment to realize the reuse of organic wastewater, including a filtration section 1, an aeration section 2, an electrocatalytic oxidation section 3 and a water quality adjustment section 4;

[0068] 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;

[0069] Aeration section 2 includes aeration tank feed pump 2-1, aeration tank 2-2, aeration tank drain valve 2-3, aeration pump 2-4, catalyst tank 2-5, catalyst feed valve 2- 6 and catalyst feed pumps 2-7;

[0070] 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 tan...

Embodiment 2

[0078] In this embodiment, the method for realizing the reuse of organic wastewater by using the three-dimensional electrolysis of the liquid-solid fluidized bed system described in Embodiment 1 to remove organic matter includes the following steps:

[0079] The organic wastewater 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 drain 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 treatment; a part of the filtered clear liquid is sent into the aeration tank 2 through the aeration tank feed pump 2-1 -2; another part of the filtered clear liquid is sent into the regulating tank 4-4 through the regulating tank raw water pump 4-3; the catalyst in the catalyst tank ...

Embodiment 3

[0082] This embodiment takes the activated carbon flushing wastewater of an enterprise as the treatment object, and the treatment capacity is 10m 3 / h, the initial value of COD is 1000. The catalyst in the aeration section 2 is a sodium chloride solution, and the amount of the catalyst added is 0.1% of the mass of the organic wastewater; the aeration valve is a jet. The plate-frame electrolyzer 3-3 has built-in liquid diversion openings arranged diagonally, the water flow is in series structure, and the current is also in series structure. Platinum ruthenium iridium tantalum tin antimony manganese coated titanium electrode is used as the anode in plate and frame electrolytic cell 3-3, and titanium electrode is used as the cathode; the distance between cathode and anode is 2mm; the current density of anode is 50A / 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...

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Abstract

The invention belongs to the fields of chemical industry and environmental protection. Specifically, the invention discloses a system and method for three-dimensional electrolytic removal of organic matter in a liquid-solid fluidized bed to realize the reuse of organic wastewater. The suspended solids in the organic wastewater are removed by gravity settling and filtration equipment to realize wastewater pre-purification. Through aeration treatment, the catalyst and organic wastewater are fully mixed, and the catalytic components in the electrolysis gas are effectively used. High-efficiency pyrolysis of organic matter in wastewater is achieved by plate-frame electrolysis coupled with fluidized bed three-dimensional electrolysis. 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 way of current series connection and water flow series connection is adopted, which strengthens the circulation of water quality, improves the efficiency of mass transfer, and promotes the cracking of organic matter. In fluidized bed electrolysis, protrusions are provided on the surface of the anode to inhibit the wear of fluidized particles, protect the catalytic coating, and achieve efficient decomposition and removal of organic matter.

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 organic matter in a liquid-solid fluidized bed to realize the reuse of organic wastewater. 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 intervene in pollutants. The organic wastewater involved in the present invention is a very typical class of pollutants. [0003] Organic wastewater widely exists in many industrial fields, including textile, pharmaceutical, pesticide, leather, petroleum, chemical, coal, metallurgy and other fie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F101/30
CPCC02F9/00C02F1/4672C02F1/001C02F2001/007C02F2101/30C02F1/66
Inventor 杨海涛朱庆山张英志
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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