Catalysis and micro-electrolysis combined technology for high-concentration refractory organic wastewater

An organic wastewater and combined process technology, applied in the field of environmental engineering, can solve the problems of poor electrochemical reaction efficiency and organic matter degradation ability, high cost, and hydrogen peroxide to increase the cost of wastewater treatment, so as to improve electrochemical treatment capacity and efficiency, improve treatment Ability and efficiency, the effect of improving redox efficiency

Inactive Publication Date: 2010-03-10
CENT SOUTH UNIV
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Problems solved by technology

The electrode potential of ordinary iron-carbon micro-electrolysis is low, the electrochemical reaction efficiency and organic matter degradation ability are poor. At the same time, the mass transfer efficiency of the iron-carbon micro-electrolysis system is not high, and iron filings are prone to passivation
Inspired by the Fenton reagent, some researchers added hydrogen peroxide to the iron-carbon micro-electrolysis system to achieve the purpose of improving the treatment efficiency (Liu Rupeng, Qu Ying, Wang Quanyong. Research on strengthening micro-electrolysis to remove TOC and chroma in middle-stage wastewater. Industry Wastewater Treatment, 2008, 28(10).), but the utilization rate of hydrogen peroxide is low, and the addition of a large amount of hydrogen peroxide greatly increases the cost of wastewater treatment
Secondly, due to the complexity of organic wastewater, using a single iron-carbon micro-electrolysis method to treat complex wastewater has high cost and poor operability
For example, electrochemical methods can degrade phenol pollutants well, but phenol is completely mineralized into water and CO 2 24 electrons are required, therefore, it is costly to fully degrade phenol by electrochemical methods
Another example is printing and dyeing wastewater, which has large water volume, deep color, high alkalinity, complex and changeable water quality, and contains refractory organic substances such as PVA slurry and new additives, and its biodegradability is very poor.
In this regard, traditional biological treatment technology can only remove COD and chroma of printing and dyeing wastewater to a limited extent. Electrochemical method has great advantages, but the high concentration of suspended solids and colloidal solids in printing and dyeing wastewater will hinder the electrochemical reaction

Method used

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  • Catalysis and micro-electrolysis combined technology for high-concentration refractory organic wastewater
  • Catalysis and micro-electrolysis combined technology for high-concentration refractory organic wastewater
  • Catalysis and micro-electrolysis combined technology for high-concentration refractory organic wastewater

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Experimental program
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Embodiment 1

[0025] Implementation steps of high-concentration organic wastewater treatment from caprolactam production in a petrochemical company.

[0026] ① The raw water in the adjustment tank is fed into the diffused air flotation tank with a flow rate of 5L / h by a micro pump for air flotation treatment, and the designed residence time of the air flotation tank is 18 minutes.

[0027]② Use 5% sulfuric acid solution to adjust the pH of the wastewater to 3.0, and treat it with a catalytic iron-carbon micro-electrolysis column with a ratio of iron: carbon: catalyst of 2:1:0.02. The residence time of wastewater is 1.5h, and the volume ratio of water to filler is 2. : 3, the backwashing method of the catalytic iron-carbon micro-electrolytic column is air-water combined backwashing, and the backwashing time interval is 8h.

[0028] ③ The effluent of the catalytic iron-carbon micro-electrolysis column uses 10% milk of lime to adjust the pH to 8.0, then enters the advection sedimentation tank,...

Embodiment 2

[0031] Implementation steps of organic wastewater treatment in a chemical enterprise.

[0032] ① The raw water in the adjustment tank is pumped into the air flotation treatment system at a flow rate of 5L / h. The air flotation adopts the method of dissolved air and advection floating pool. The pressure of dissolved air water is 0.3MPa, and the residence time is 15mim.

[0033] ②Using 10% sulfuric acid solution to adjust the pH of the wastewater to 1.8, the effluent from the air flotation tank is treated with a catalytic iron-carbon micro-electrolysis column with a ratio of iron, carbon and catalyst of 3:2:0.1. : 1, the backwashing method is high pressure water backwashing.

[0034] ③The effluent of the catalytic iron-carbon micro-electrolysis column is adjusted to pH 7.5 with 10% milk of lime, and then enters the advection sedimentation tank, and the residence time of the sedimentation tank is 1.5h.

[0035] ④ The effluent from the sedimentation tank enters the biochemical tre...

Embodiment 3

[0037] Implementation steps for the treatment of simulated liquid containing toluene wastewater.

[0038] ① The raw water in the adjustment pool is pumped into the diffused air flotation pool for air flotation treatment at a flow rate of 3L / h, and the air flotation time is 16 minutes.

[0039] ② Use 5% sulfuric acid solution to adjust the pH of the wastewater to 2.5, and treat it with a catalytic iron-carbon micro-electrolysis column with a ratio of iron, carbon and catalyst of 2:1:0.2. The residence time of wastewater is 1.5h, and the volume ratio of water to filler is 1. : 1, the backwashing method is air-water combined backwashing.

[0040] ③ The effluent from the catalytic iron-carbon micro-electrolysis column uses 10% lime milk to adjust the pH to 7.5 and then enters the biochemical treatment system. The biochemical system adopts the hydrolytic acidification-aerobic aeration (HAT / O) process. The HAT section has a built-in YDT elastic three-dimensional filler, and the res...

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Abstract

The invention relates to a catalysis and micro-electrolysis combined technology for high-concentration refractory organic wastewater; the organic wastewater is collected to an adjusting tank and enters an air floatation tank for air floatation treatment to remove part of the organic matters after the adjustment of water volume and water quality; the scruff is collected or recovered; the wastewatergoes through Ph adjustment and then enters a catalytic iron-carbon and micro-electrolysis unit to improve the biochemical quality; the effluent goes through Ph adjustment and then enters a sedimentation tank; the effluent of the sedimentation tank adopts anoxic-aerobic biochemistry treatment to remove the organic matters and ammonia nitrogen and then is emitted after reaching the standard; and the filler of the catalytic iron-carbon and micro-electrolysis unit comprises iron, carbon and a catalyst, wherein the mass ratio of the iron, carbon and catalyst is 1: (0.3-1.5): (0.01-0.5). The invention can effectively improve the micro-electrolysis electrochemical reaction efficiency and the degrading capability to the organic matters, and reduce the wastewater treatment cost with convenient technological operation.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a combined process for treating high-concentration refractory organic wastewater. Background technique [0002] With the development of industry, various types of organic wastewater discharged during the production process are increasing, especially high-concentration and refractory organic wastewater. practical significance. The electrochemical method of wastewater treatment began in the 1940s. In recent years, with the development of the electric power industry, the electrochemical method has been really applied to the wastewater treatment process, including landfill leachate, tannery wastewater, printing and dyeing wastewater, petroleum and chemical wastewater, etc. . The electrochemical method is an "environmentally friendly" process, which has many advantages and characteristics that cannot be compared with other methods: ① No additional redox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/461C02F1/24C02F1/66C02F3/30
Inventor 黄可龙刘素琴刘耀驰刘维
Owner CENT SOUTH UNIV
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