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Advanced treatment method of biochemical tail water of coking wastewater

A technology for coking wastewater and advanced treatment, which is applied in oxidation water/sewage treatment, metallurgical wastewater treatment, adsorbed water/sewage treatment, etc. Simple operation and low cost effect

Inactive Publication Date: 2009-08-26
HUNAN CHENZHOU QINXIN HIGH TECH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flocculant pretreatment process requires stirring, which consumes a lot of power, and the stirring equipment is easy to be worn out. At the same time, the cost of the flocculant used is relatively high, which makes the operating cost very high.

Method used

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  • Advanced treatment method of biochemical tail water of coking wastewater

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Comparison scheme
Effect test

Embodiment 1

[0016] A method for advanced treatment of coking wastewater biochemical tail water, comprising the following steps:

[0017] Step 1 Catalytic Oxidation

[0018] The coking wastewater that has not reached the standard after biochemical treatment flows into the adjustment tank, and the pH is adjusted to 12 with sodium hydroxide at 10 ℃ ~ 30 ℃, and then potassium permanganate is added to carry out dephenolization reaction for 1 hour, and the dephenolization reaction mixture is precipitated for 0.5 hours. The supernatant liquid is drained and filtered, and the filtration separation technology can further remove colloidal organic matter and fine activated sludge particles, so that the COD of the effluent is reduced to 110mg / L, and the chromaticity is close to colorless; the filtered and separated filter residue and sedimentary sludge are concentrated together. deal with;

[0019] Step 2 Adsorption Treatment

[0020] The filtrate of step 1 was heated at 10°C to 30°C and the flow r...

Embodiment 2

[0024] A method for advanced treatment of coking wastewater biochemical tail water, comprising the following steps:

[0025] Step 1 Catalytic Oxidation

[0026] The coking wastewater that has not reached the standard after biochemical treatment flows into the adjustment tank, and the pH is adjusted to 11 with calcium hydroxide at 20 ℃ ~ 40 ℃, and then potassium ferrate is added to carry out dephenolization reaction for 2 hours, and the dephenolization reaction mixture is precipitated for 1 hour. The supernatant is drained and filtered, and the filtration and separation technology can further remove colloidal organic matter and fine activated sludge particles, so that the COD of the effluent is reduced to 115mg / L, and the chroma is close to colorless; the filtered residue and sedimentary sludge are concentrated together.

[0027] Step 2 Adsorption Treatment

[0028] The filtrate of step 1 was heated at 20℃~40℃ and the flow rate was 6m 3 Under the condition of / h, it passes th...

Embodiment 3

[0032] A method for advanced treatment of coking wastewater biochemical tail water, comprising the following steps:

[0033] Step 1 Catalytic Oxidation

[0034] The coking wastewater that has not reached the standard after biochemical treatment flows into the adjustment tank, and the pH is adjusted to 9 with sodium hydroxide at 10 ℃ ~ 40 ℃, and then ozone is added to carry out dephenolization reaction for 2 hours, the dephenolization reaction mixture is precipitated for 1.5 hours, and the supernatant The liquid is drained and filtered, and the filtration and separation technology can further remove colloidal organic matter and fine activated sludge particles, so that the COD of the effluent is reduced to 120mg / L, and the chromaticity is close to colorless; the filtered residue and sedimentary sludge are concentrated together;

[0035] Step 2 Adsorption Treatment

[0036] The filtrate of step 1 was heated to 10℃~40℃ and the flow rate was 8m 3 Under the condition of / h, it pas...

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Abstract

The invention discloses an advanced treatment method of biochemical tail water of coking wastewater. The method is characterized by regulating pH of the biochemical tail water of the coking wastewater in a regulation tank to 9-12 by alkaline matters, then adding high-efficiency oxidizing agent for oxidation treatment, precipitating and separating mixed solution, adsorbing filtrate; adsorbing trace organic matters in the wastewater on resin, reclaiming by water at normal temperature; COD of the wastewater reduces from 200mg / L to below 100mg / L after the treatment, chromaticity reduces from 100 folds to almost achromaticity, and other indexes meet Grade 1 standard of the national integrated sewage discharge standard.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a method for advanced treatment of coking wastewater biochemical tail water, and belongs to the technical field of environmental protection engineering. Background technique [0002] Coking wastewater is the wastewater produced in the process of coal coking, gas purification and coking product recovery. Its composition is complex and changeable, containing a variety of organic substances that are difficult to be degraded by microorganisms or biotoxic, and a large number of inorganic salts such as ammonium salts, sulfides, cyanides, etc. It is an industrial organic compound with high COD value, high phenol value and high ammonia nitrogen content. Wastewater is difficult to treat. Among them, phenolic compounds dominated by phenol account for more than 70% of the total organic matter. These components in coking wastewater have a great impact on the environment, especially polycycl...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/72C02F1/52C02F1/28C02F103/16
Inventor 曹祖勤刘惠平朱鹏
Owner HUNAN CHENZHOU QINXIN HIGH TECH GROUP
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