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Supercritical water oxidation treatment method for high-concentration organic wastewater

A supercritical water oxidation and treatment method technology, applied in the direction of water/sewage multi-stage treatment, degassed water/sewage treatment, oxidized water/sewage treatment, etc. High energy consumption and other problems, to achieve the effect of short reaction time, high processing efficiency, and low energy consumption

Active Publication Date: 2010-12-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to give full play to the advantages of supercritical water oxidation treatment of organic waste and solve the existing problems in the prior art, such as low treatment efficiency, high operating energy consumption, and difficulty in continuous operation of the treatment system, the present invention utilizes the existing technology and material conditions, from practical Proceeding from nature, a technically feasible supercritical water oxidation treatment method for organic wastewater is provided

Method used

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  • Supercritical water oxidation treatment method for high-concentration organic wastewater
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The laboratory prepared phenol-containing wastewater, and its main components are shown in Table 1.

[0031] Table 1

[0032] main ingredient

content

COD

32740mg / L

TOC

11502mg / L

Phenol concentration

15g / L

Salt content

58.8mg / L

Cl-concentration

20.2mg / L

[0033] The prepared phenol-containing wastewater and the hydrogen peroxide with hydrogen peroxide as an oxidant are first pressurized to 40MPa through high-pressure pumps 1 and 2, and then enter the heat exchanger 3 respectively; 1.1 times the amount (mol).

[0034] After heat exchange, the hydrogen peroxide and phenol-containing wastewater enter the preheater 4, and the temperature rises to 400°C; then the hydrogen peroxide and phenol-containing wastewater are mixed in the mixer 5, and the mixing residence time is 1 second.

[0035] The mixed phenol-containing wastewater enters the reactor 6, which is a double-pipe reactor, and its reaction tu...

Embodiment 2

[0038] The laboratory prepares waste water containing cyclohexane formic acid, and its main components are shown in Table 2.

[0039] Table 2

[0040] main ingredient

content

COD

31250mg / L

TOC

9656mg / L

Cyclohexanecarboxylic acid concentration

15g / L

Salt content

102.5mg / L

Cl - concentration

44.6mg / L

[0041] Contain cyclohexane formic acid waste water and the hydrogen peroxide with hydrogen peroxide as oxygenant, at first pressurize to 25MPa, then enter heat exchanger 3 respectively; The amount (mol) of hydrogen peroxide is the complete oxidation theoretical oxygen demand ( Mole) 1.3 times.

[0042] After heat exchange, the hydrogen peroxide and wastewater containing cyclohexane formic acid enter the preheater 4, and the temperature rises to 450°C; then the hydrogen peroxide and phenol wastewater are mixed in the mixer 5, and the mixing residence time is 5 seconds.

[0043] The mixed waste water contai...

Embodiment 3

[0046] The laboratory prepared waste water containing p-aminobenzenesulfonic acid, the main components of which are shown in Table 3,

[0047] table 3

[0048] main ingredient

content

COD

31020mg / L

[0049] TOC

9538mg / L

Concentration of sulfanilic acid

25g / L

Salt content

320.8mg / L

Cl - concentration

89.5mg / L

[0050] The amount (mole) of hydrogen peroxide is 1.4 times of the theoretical oxygen demand (mole) of complete oxidation of organic matter in waste water containing p-aminobenzenesulfonic acid; the reaction temperature of supercritical water oxidation reaction is 600 ℃, reaction pressure is 25MPa, reaction time is 50 second, other operating parameters and process and processing equipment are the same as in Embodiment 1.

[0051] The TOC removal rate of this treatment process reaches over 99%.

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Abstract

The invention provides a supercritical water oxidation treatment method for high-concentration organic wastewater, which comprises the following steps of: pressurizing, preheating, performing supercritical water oxidation reaction and the like. By limiting the content of chloride ions and the content of salt in the wastewater, equipment corrosion and pipeline blockage are controlled in a tolerable range; by controlling the COD concentration of the wastewater, the oxidation reaction is autothermal reaction; and by adopting a multi-tube reactor, the requirement on treatment equipment materials and the equipment processing difficulty are reduced. The method makes the TOC removal rate of over 99 percent, and has the characteristics of small reactor volume, short reaction time, high treatment efficiency, low energy consumption of running, continuous and stable running of the treatment system and the like.

Description

technical field [0001] The invention relates to a method for treating waste water, more specifically, relates to a method for treating high-concentration organic waste water by using supercritical water oxidation technology. Background technique [0002] With the development of the economy, the pollutants produced in the production process of pesticides and dyes are increasingly polluting water bodies. These pollutants have stable chemical structures and are more harmful to the environment, and cannot be directly processed by traditional biological methods. deal with. [0003] Supercritical water oxidation is a kind of advanced oxidation method, which can completely oxidize and destroy organic matter, and is one of the effective methods for treating high-concentration, toxic and refractory organic waste. [0004] When the temperature and pressure of water are raised above the critical point (Tc=374.3°C, Pc=22.05MPa), a fluid state that is different from gaseous state, liqui...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/72C02F1/20
Inventor 孙杰刘正程学文
Owner CHINA PETROLEUM & CHEM CORP
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