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Coking wastewater deep treatment method

A technology for advanced treatment and coking wastewater, applied in the field of water treatment, can solve problems such as difficult to meet the industry's first-level discharge standards, no significant effect, difficult to biodegrade, etc.

Active Publication Date: 2017-09-29
HANGZHOU KAIYUAN ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Coking wastewater contains a certain amount of organic matter that is difficult to biodegrade, and traditional biological treatment methods have no significant effect
Relevant data show that most coking wastewater treatment in China currently adopts conventional biological treatment, and the concentration of CODcr and NH3-N in the effluent treated by this method is difficult to meet the industry's first-level discharge standard, and CODcr can only be removed to 200-300mg / L about

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Experimental program
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Effect test

Embodiment 1

[0063] A method for advanced treatment of coking wastewater, comprising the following steps:

[0064] (1) Electrocatalytic oxidation: Electrocatalytic oxidation is carried out for 1 h with the wastewater with a pH value of 8 after pre-filtering. is 28%, and the current density is i=110A / m 2 . The electrocatalytic oxidation device comprises 10 units connected in sequence, and each unit includes an anode and a cathode; the anode of the previous unit is connected to the cathode of the latter unit, and the cathode of the first unit is connected to the cathode of the last unit. The anode is connected; the anode is lead dioxide, the cathode is a titanium plate, and the electrolyte is sodium sulfate. Aeration treatment is carried out at the same time as electrolysis.

[0065] (2) Inclined tube sedimentation: transfer the electrocatalytic oxidation wastewater for inclined tube sedimentation.

[0066](3) Micro-electrolysis: adjust the pH value of the wastewater treated in step (2) ...

Embodiment 2

[0070] A method for advanced treatment of coking wastewater, comprising the following steps:

[0071] (1) Electrocatalytic oxidation: Electrocatalytic oxidation is carried out for 1 h with the wastewater with a pH value of 8 after pre-filtering. is 28%, and the current density is i=110A / m 2 . The electrocatalytic oxidation device comprises 10 units connected in sequence, and each unit includes an anode and a cathode; the anode of the previous unit is connected to the cathode of the latter unit, and the cathode of the first unit is connected to the cathode of the last unit. The anode is connected; the anode is lead dioxide, the cathode is a titanium plate, and the electrolyte is sodium sulfate. Aeration treatment was carried out at the same time as the electrolysis, and in addition, a catalytic substance was added to the wastewater at the same time, the catalytic substance was activated carbon loaded with oxygen-containing substances, and the addition amount was 30 g / L.

[0...

Embodiment 3

[0077] A method for advanced treatment of coking wastewater, comprising the following steps:

[0078] (1) Electrocatalytic oxidation: the wastewater with a pH value of 8 after pre-filtering is electrocatalytically oxidized for 60 minutes with an electrocatalytic oxidation device. is 28%, and the current density is i=110A / m 2 . The electrocatalytic oxidation device comprises 10 units connected in sequence, and each unit includes an anode and a cathode; the anode of the previous unit is connected to the cathode of the latter unit, and the cathode of the first unit is connected to the cathode of the last unit. The anode is connected; the anode is lead dioxide, the cathode is a titanium plate, and the electrolyte is sodium sulfate. Aeration treatment was carried out at the same time as the electrolysis, and in addition, a catalyst was added to the wastewater at the same time. The catalyst was a gas-phase porous carbon material loaded with oxygen-containing substances, and the ad...

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Abstract

The invention relates to the field of water treatment and discloses a coking wastewater deep treatment method. The coking wastewater deep treatment method comprises (1) electrocatalytic oxidation: performing pulse type electrocatalytic oxidation for 50-70 minutes on pre-filtered wastewater, the pH value of which is 7.5-8.5; (2) inclined tubing sedimentation: transferring the wastewater for inclined tubing sedimentation; (3) microelectrolysis: adjusting the pH value of the wastewater to 2-3 and then performing microelectrolysis for 50-70 minutes; (4) inclined tubing sedimentation: transferring the wastewater and performing inclined tubing sedimentation again, and dehydrating and draining the sludge precipitated in the step (2) and the step; and (5) multimedia filtration: transferring the wastewater to an intermediate water pond, and then filtering the wastewater by multimedia, wherein the filtered wastewater is treated completely. As the coking wastewater which is treated by a biological method is further treated by an electrochemical process, the removal rate of CODcr and NH3-N can be further increased, and a remarkable effect is achieved.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for advanced treatment of coking wastewater. Background technique [0002] Coking waste water is produced in the process of high temperature dry distillation of raw coal, gas purification and refining of chemical products. Its composition is complex, containing dozens of inorganic and organic compounds. Inorganic compounds are mainly a large amount of ammonia salt, thiocyanide, sulfide, cyanide, etc.; in addition to phenols, organic compounds also have monocyclic and polycyclic aromatic compounds, heterocyclic compounds containing nitrogen, sulfur, and oxygen. Wait. [0003] The main sources of coking wastewater are: coal entrainment into water, reaction to generate water and coking products steam and fresh water added in distillation, washing, condensed or separated wastewater after contact with gas and products, including gas collector spray separation liquid The rema...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F1/001C02F1/46176C02F1/4672C02F1/52C02F1/725C02F9/00C02F2201/46175C02F2209/06C02F2209/08C02F2209/14C02F2301/08C02F2305/023
Inventor 朱和林吴冰杨敏章柏军沈文波王庆生
Owner HANGZHOU KAIYUAN ENVIRONMENTAL PROTECTION ENG