CN101928080B - Supercritical water oxidation treatment method for high-concentration organic wastewater - Google Patents
Supercritical water oxidation treatment method for high-concentration organic wastewater Download PDFInfo
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- CN101928080B CN101928080B CN2009100877741A CN200910087774A CN101928080B CN 101928080 B CN101928080 B CN 101928080B CN 2009100877741 A CN2009100877741 A CN 2009100877741A CN 200910087774 A CN200910087774 A CN 200910087774A CN 101928080 B CN101928080 B CN 101928080B
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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
The present invention relates to a kind of wastewater treatment method, more particularly, relate to a kind of method that adopts supercritical water oxidation technical finesse high concentrated organic wastewater.
Background technology
Along with expanding economy, the pollutent that in production processes such as agricultural chemicals, dyestuff, produces is on the rise to the pollution of water body, and the steady chemical structure of these pollution substances is bigger to the harm of environment, and can't directly adopt traditional biological process technology to handle.
Supercritical water oxidation is a kind of of advanced oxidation processes, and this method can be destroyed organism by exhaustive oxidation, is one of effective means of treatment of high concentration, poisonous, difficult oxidation organic waste.
The temperature and pressure of water is elevated to (Tc=374.3 ℃ of stagnation point; When Pc=22.05MPa) above; Will form a kind of gaseous state that both had been different from and also be different from liquid or solid-state fluid attitude, promptly above-critical state carries out oxidizing reaction and is supercritical water oxidation under this state.
Organism that this method will be handled and oxygen are dissolved in the supercritical water, make supercritical water oxidation become homogeneous reaction, can significantly reduce interphase mass transfer, heat transmission resistance; Can fully introduce oxygen and participate in reaction (oxygen can any ratio dissolve in supercritical water); Supercritical water not only has extremely strong transmittability, and does not have the mass transfer problem between the gas liquid film; Because supercritical water more helps the generation of radical than normal fluid, and the material that is dissolved in the supercritical water also shows the behavior of inclined to one side mole, thereby improved speed of reaction greatly, and ideal oxidizing reaction environment can be provided.
Supercritical water oxidation technical finesse organic waste have the following advantages: (1) reaction in supercritical water oxidation system is a homogeneous reaction; Oxygen, hydrocarbon polymer, water form homogeneous phase, do not have the interphase mass transfer resistance, and processing speed is high; Structure of reactor is simple, and equipment volume is little; (2) can decompose multiple organic cpds, like nylon-6, methane, NH
3, mutual-amino phenol, sodium laurylsulfonate etc.; (3) oxidation efficiency is high, and most of organic oxidation ratio can reach more than 99%, is applicable to the processing of poisonous, objectionable impurities and high concentration hard-degraded organic waste water; (4) can realize autothermal reaction at organic concentration about 3%, except that keep id reaction required, unnecessary heat energy can also reclaim; (5) inorganic component and the salt solubleness in supercritical water is very low, almost can all precipitate and separate out.
Also there is shortcoming in supercritical water oxidation technical finesse organic waste: owing to be operation under high-temperature and high-pressure conditions, treatment facility is difficult to maximize (1); (2) when hanging down pH, under the condition that especially cl ions exists, equipment corrosion is serious, and general material is difficult to satisfy equipment requirements; (3) in the supercritical water oxidation process, the salt in the waste water is almost all separated out, and causes the obstruction of pipeline easily, and equipment can't move continuously; (4) if can not realize autothermal reaction, the operational conditions of HTHP can increase the power consumption of treating processes.
Supercritical water oxidation moves under high temperature, condition of high voltage; When handling the organic waste water of higher concentration; Supercritical water oxidation can utilize the heat self-heating that produces when organism decomposes in the waste water, and can reduce does not even need oxidizing reaction is heated, and energy consumption is lower; When handling low-concentration organic waste water, oxidizing reaction needs indirect heating, and energy consumption is higher; Therefore adopt supercritical water oxidation treatment high concentration organic waste water to have more practical significance.
Salt sedimentation is one of subject matter of supercritical water oxidation, stops up for fear of pipeline, needs aspects such as slave unit structure, processing parameter and control device comprehensively to improve.At present, can directly get into reactor drum for the lower concentration brine waste and handle, can at first adopt the additive method desalination for the high density brine waste after, carry out supercritical water oxidation again.
In the prior art, Chinese patent CN1730414 " a kind of method of using supercritical water oxidation to handle waste water ", the filler desalination plant of employing does not solve continuous salt discharge, can't guarantee the continuous operation of treatment system.At present, the practicality of the supercritical water oxidation treatment technology of field of waste water treatment is still waiting to improve, and high processing efficient, lower energy consumption not only will be arranged, but also requires the treatment unit can the continous-stable operation.
Summary of the invention
Handle the advantage of organic waste in order to give full play to supercritical water oxidation; The processing efficiency that exists in the solution prior art is low, operation energy consumption is high, treatment system is moved problems such as difficulty continuously; The present invention utilizes existing technology and material condition; From practicality, a kind of organic waste water supercritical water oxidation treatment method of technical feasibility is provided.
Treatment process of the present invention is achieved in that
A kind of supercritical water oxidation treatment method of high concentrated organic wastewater, the COD concentration of said waste water be 3～5wt%, chlorine ion concentration less than 100mg/L, salts contg less than 500mg/L, this treatment process may further comprise the steps successively:
(1) said waste water and ydrogen peroxide 50 are forced into 25～40MPa through HPP [1], [2] at first respectively, get into interchanger [3] then respectively; The molar weight of said ydrogen peroxide 50 is 1.0～1.5 times of the theoretical aerobic molar weight of organism complete oxidation in the said waste water;
Said ydrogen peroxide 50 after the heat exchange and said waste water get into preheater [4] respectively, make its temperature be increased to 400～500 ℃:
(2) said ydrogen peroxide 50 after the preheating and said waste water get into mixing tank [5] mixing, get into reactor drum [6] then and carry out supercritical water oxidation;
(3) water outlet of said oxidizing reaction is carried out gas-liquid separation through the cooling of interchanger [3] and water cooler [7], after reducing valve [8] reduces to normal pressure in gas-liquid separator [9].
In the specific implementation, in step (2), said ydrogen peroxide 50 and said waste water mix stop 1～5 second in mixing tank [5]; Said reactor drum [6] is a multi-tubular reactor, and a plurality of reaction tubess of this multi-tubular reactor are vertical layout, goes out through said reaction tubes under process said ydrogen peroxide 50 of blended and said waste water are enterprising; The reaction pressure of said supercritical water oxidation is that 25～40MPa, temperature of reaction are that 450～600 ℃, the residence time are 30～200 seconds; Measure the temperature of said reaction tubes top, middle part, bottom, the flooding quantity through regulating each reaction tubes and reaction tubes top or middle part add heat, control evenly carrying out of oxidizing reaction in each reaction tubes.
Method of the present invention is the effective ways of treatment of high concentration, poisonous, difficult oxidized organic wastewater.For making this method have practicality more, the high concentrated organic wastewater COD concentration of processing is greater than 3%, to reach the purpose of heat balance; The chloride ion content that makes waste water through the pre-treatment means less than 100mg/L, salts contg less than 500mg/L, to reduce corrosion on Equipment and the obstruction of avoiding pipeline.
For the purpose ydrogen peroxide 50 that reaches water saving can utilize supercritical water oxidation water outlet preparation.Ydrogen peroxide 50 is generally 1～2: 1 with the ratio of high concentrated organic wastewater flooding quantity.
High concentrated organic wastewater and ydrogen peroxide 50 get into overcritical multitubular reactor, according to different pollutents, control different reaction pressure, the residence time, and utilize organism reaction generation self-heating to make temperature of reaction remain on 450～600 ℃.
Treatment process of the present invention has improved the practicality of supercritical water oxidation treatment high concentration organic waste water.Be mainly reflected in:
1. the high concentrated organic wastewater of handling is defined, the cl ions of the organic waste water that control is reacted and the content of salt stop up equipment corrosion and pipeline and are controlled in the scope that can bear;
2. control the COD concentration of waste water, the heat that produces when supercritical water oxidation is handled reaches reaction self-heating, reduces the wastewater treatment energy consumption;
3. according to the characteristics of supercritical water oxidation technology and current material horizontal, adopt multitubular reactor, reduce the difficulty of treatment facility material requirements and apparatus processing.
Adopt treatment process of the present invention; Waste water is through the supercritical water oxidation single step reaction; According to organic kind control reaction pressure 25～40MPa, 400～600 ℃ of temperature of reaction, 30～200 seconds reaction times in the waste water, the TOC clearance of waste water can reach more than 99%.Treatment process of the present invention, the organism in the waste water can decompose basically fully, and the waste water of discharging after the primary treatment can reach emission standard, non-secondary pollution after general biochemical treatment; And reactor volume is little, the reaction times is short, processing efficiency is high, operation energy consumption is low, and treatment system can the continous-stable operation.
Description of drawings
Fig. 1 is a high concentrated organic wastewater supercritical water oxidation treatment scheme synoptic diagram of the present invention.
Embodiment
Below in conjunction with embodiment technical scheme of the present invention is detailed further, protection scope of the present invention is not limited to following embodiment.
Embodiment 1
Testing laboratory's preparation wastewater containing phenol, its staple is seen table 1,
Table 1
| Staple | Content |
| COD | 32740mg/L |
| TOC | 11502mg/L |
| Phenol concentration | 15g/L |
| Saltiness | 58.8mg/L |
| C1-concentration | 20.2mg/L |
The wastewater containing phenol of preparation and be the ydrogen peroxide 50 of oxygenant with the ydrogen peroxide 50 at first is forced into 40MPa through HPP 1,2, gets into interchanger 3 then respectively; The amount of ydrogen peroxide 50 (mole) is 1.1 times of organism complete oxidation theoretical oxygen demand (mole) in the wastewater containing phenol.
Ydrogen peroxide 50 after the heat exchange and wastewater containing phenol get into preheater 4, and temperature is increased to 400 ℃; Ydrogen peroxide 50 and wastewater containing phenol mix at mixing tank 5 then, and mixing the residence time is 1 second.
Mixed wastewater containing phenol gets into reactor drum 6, and this reactor drum is the double hose reactor drum, and its reaction tubes is vertical layout, goes out through reaction tubes to carry out successive reaction under mixed wastewater containing phenol is enterprising.Reactor drum adopts 316L material, Φ 20mm * 530mm, withstand voltage 50MPa.Process easily for making the supercritical reaction device; Multitubular reactor is made up of two less single tubes of diameter; Measure the temperature of said reaction tubes top, middle part, bottom; Flooding quantity through regulating each reaction tubes and reaction tubes top or middle part add heat, control evenly carrying out of oxidizing reaction in each reaction tubes, and realization response process self-heating.
The reaction pressure of supercritical water oxidation is that 40MPa, temperature of reaction are that 550 ℃, the residence time are 160 seconds.The reaction water outlet is at first through interchanger 3 and water cooler 7 coolings; Water cooler adopts coiled pipe cooler, walks material, coil pipe in the coil pipe and is water coolant outward, fast with the material cooling, with controlling reaction time; After reducing valve 8 reduces to normal pressure, in gas-liquid separator 9, distinguish exhaust and draining then, the TOC clearance of this treating processes is 99.45%.
Embodiment 2
Testing laboratory's preparation contains naphthenic acid waste water, and its staple is seen table 2,
Table 2
| Staple | Content |
| COD | 31250mg/L |
| TOC | 9656mg/L |
| Naphthenic acid concentration | 15g/L |
| Saltiness | 102.5mg/L |
| Cl -Concentration | 44.6mg/L |
Contain naphthenic acid waste water and be the ydrogen peroxide 50 of oxygenant, at first be forced into 25MPa, get into interchanger 3 then respectively with the ydrogen peroxide 50; The amount of ydrogen peroxide 50 (mole) is for containing 1.3 times of organism complete oxidation theoretical oxygen demand (mole) in the naphthenic acid waste water.
Ydrogen peroxide 50 after the heat exchange with contain naphthenic acid waste water waste water and get into preheater 4, temperature is increased to 450 ℃; Ydrogen peroxide 50 and phenolic waste water mix at mixing tank 5 then, and mixing the residence time is 5 seconds.
The mixed naphthenic acid waste water waste water that contains gets into reactor drum 6, and this reactor drum is four pipe reactors, and its reaction tubes is vertical layout, goes out through reaction tubes under mixed phenolic waste water is enterprising.The reaction pressure of supercritical water oxidation is that 25MPa, temperature of reaction are that 500 ℃, the residence time are 30 seconds.
The reaction water outlet at first through interchanger 3 and water cooler 7 coolings, after reducing valve 8 reduces to normal pressure, is distinguished exhaust and draining then in gas-liquid separator 9, the TOC clearance of this treating processes is more than 99%.
Embodiment 3
Testing laboratory's preparation contains Sulphanilic Acid waste water, and its staple is seen table 3,
Table 3
| Staple | Content |
| COD | 31020mg/L |
| TOC | 9538mg/L |
| Sulphanilic Acid concentration | 25g/L |
| Saltiness | 320.8mg/L |
| Cl -Concentration | 89.5mg/L |
The amount of ydrogen peroxide 50 (mole) is for containing 1.4 times of organism complete oxidation theoretical oxygen demand (mole) in the Sulphanilic Acid waste water; The temperature of reaction of supercritical water oxidation is that 600 ℃, reaction pressure are that 25MPa, reaction times are 50 seconds, other operating parameterss and identical with embodiment 1 with treating processes, treatment facility.
The TOC clearance of this treating processes reaches more than 99%.
Embodiment 4
Testing laboratory's preparation contains 2,3-xylenol waste water, and its staple is seen table 4,
Table 4
| Staple | Content |
| COD | 38050mg/L |
| TOC | 14095mg/L |
| 2,3-xylenol concentration | 15g/L |
| Saltiness | 243.5mg/L |
| Cl -Concentration | 67mg/L |
The amount of ydrogen peroxide 50 (mole) is for containing 2, in the 3-xylenol waste water 1.5 times of organism complete oxidation theoretical oxygen demand (mole); The temperature of reaction of supercritical water oxidation is that 500 ℃, reaction pressure are that 25MPa, reaction times are 40 seconds, other operating parameterss and identical with embodiment 1 with treating processes, treatment facility.
The TOC clearance of this treating processes reaches more than 99%.
Embodiment 5
The factory effluent of certain PTA of factory device discharging, the organic content of this water is high, and contains oligopolymer, and the traditional treatment method difficulty is very big, and investment is big, and effect is undesirable, and its staple is seen table 5,
Table 5
| Staple | Content |
| COD | 45530mg/L |
| TOC | 15089mg/L |
| Saltiness | 480.9mg/L |
| Cl -Concentration | 65.3mg/L |
The amount of ydrogen peroxide 50 (mole) is 1.5 times of organism complete oxidation theoretical oxygen demand (mole) in the PTA waste water; The temperature of reaction of supercritical water oxidation is that 550 ℃, reaction pressure are that 32MPa, reaction times are 70 seconds, other operating parameterss and identical with embodiment 1 with treating processes, treatment facility.
The TOC clearance of this treating processes reaches more than 99%.
Claims (3)
1. the supercritical water oxidation treatment method of a high concentrated organic wastewater is characterized in that:
The COD concentration of controlling said waste water be 3～5wt%, chlorine ion concentration less than 100mg/L, salts contg less than 500mg/L; This treatment process may further comprise the steps successively:
(1) said waste water and ydrogen peroxide 50 are forced into 25～40MPa through HPP [1,2] at first respectively, get into interchanger [3] then respectively; The molar weight of said ydrogen peroxide 50 is 1.0～1.5 times of the theoretical aerobic molar weight of organism complete oxidation in the said waste water;
Said ydrogen peroxide 50 after the heat exchange and said waste water get into preheater [4] respectively, make its temperature be increased to 400～500 ℃;
(2) said ydrogen peroxide 50 after the preheating and said waste water get into mixing tank [5] mixing, get into reactor drum [6] then and carry out supercritical water oxidation; Said ydrogen peroxide 50 and said waste water mix in mixing tank [5] and stopped 1～5 second, and the reaction pressure of said supercritical water oxidation is that 25～40MPa, temperature of reaction are that 450～600 ℃, the residence time are 30～200 seconds;
(3) water outlet of said oxidizing reaction is carried out gas-liquid separation through the cooling of interchanger [3] and water cooler [7], after reducing valve [8] reduces to normal pressure in gas-liquid separator [9].
2. treatment process according to claim 1 is characterized in that:
In step (2), said reactor drum [6] is a multi-tubular reactor, and a plurality of reaction tubess of this multi-tubular reactor are vertical layout, goes out through said reaction tubes under process said ydrogen peroxide 50 of blended and said waste water are enterprising.
3. treatment process according to claim 2 is characterized in that:
Measure the temperature of said reaction tubes top, middle part, bottom, the flooding quantity through regulating each reaction tubes and reaction tubes top or middle part add heat, control evenly carrying out of oxidizing reaction in each reaction tubes.
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| CN111003789A (en) * | 2019-12-26 | 2020-04-14 | 一重集团大连工程技术有限公司 | Depressurization system of supercritical water oxidation system |
| CN111346483A (en) * | 2020-02-24 | 2020-06-30 | 广西大学 | Method and equipment for simultaneously removing VOCs (volatile organic compounds) and PM (particulate matter) 2.5 |
| CN111348737A (en) * | 2020-02-24 | 2020-06-30 | 广西大学 | Method and equipment for simultaneously treating organic matter wastewater, VOCs and PM2.5 waste gas |
| CN112844346A (en) * | 2020-12-31 | 2021-05-28 | 成都九翼环保科技有限公司 | Supercritical hydrothermal powdered activated carbon regeneration device and method |
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| CN1211540A (en) * | 1998-10-22 | 1999-03-24 | 孙传经 | Waste water treatment process by super-critical aqueous oxidation |
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| CN1211540A (en) * | 1998-10-22 | 1999-03-24 | 孙传经 | Waste water treatment process by super-critical aqueous oxidation |
| CN1730414A (en) * | 2005-06-07 | 2006-02-08 | 中国科学院山西煤炭化学研究所 | A kind of method of using supercritical water oxidation to handle waste water |
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