CN108947069B - System and method for continuously treating organic wastewater based on microchannel reactor - Google Patents
System and method for continuously treating organic wastewater based on microchannel reactor Download PDFInfo
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- CN108947069B CN108947069B CN201810882196.XA CN201810882196A CN108947069B CN 108947069 B CN108947069 B CN 108947069B CN 201810882196 A CN201810882196 A CN 201810882196A CN 108947069 B CN108947069 B CN 108947069B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007800 oxidant agent Substances 0.000 claims abstract description 43
- 230000001590 oxidative effect Effects 0.000 claims abstract description 36
- 238000003860 storage Methods 0.000 claims abstract description 29
- 238000009279 wet oxidation reaction Methods 0.000 claims abstract description 19
- 230000003647 oxidation Effects 0.000 claims abstract description 15
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 71
- 239000002699 waste material Substances 0.000 claims description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000000926 separation method Methods 0.000 claims description 23
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000006837 decompression Effects 0.000 claims description 2
- 239000010815 organic waste Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 25
- 229910052760 oxygen Inorganic materials 0.000 abstract description 25
- 239000001301 oxygen Substances 0.000 abstract description 25
- 239000003054 catalyst Substances 0.000 abstract description 9
- 238000004065 wastewater treatment Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000945 filler Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 239000002173 cutting fluid Substances 0.000 description 25
- 239000007789 gas Substances 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000000543 intermediate Substances 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010812 mixed waste Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 231100000171 higher toxicity Toxicity 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0093—Microreactors, e.g. miniaturised or microfabricated reactors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a system and a method for continuously treating organic wastewater based on a microchannel reactor, wherein the system comprises an oxidant storage tank, a wastewater storage tank, a pretreatment device, a heat exchange device and an oxidant preheating device, the pretreatment device comprises a coarse filter, a homogenizing tank, a high-pressure metering pump and a cross heat exchanger, the wastewater storage tank is connected to the coarse filter, and the coarse filter is connected to the homogenizing tank. The beneficial effects are that: the method has the advantages that no catalyst is needed, no secondary pollution is caused, the method is more environment-friendly, instant uniform mixing can be realized, wet oxidation is enhanced for wastewater treatment, and if the filler is added into the microchannel reactor, oxygen and wastewater can be fully contacted for enhancing oxidation wastewater, so that the oxidation effect is improved.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a system and a method for continuously treating organic wastewater based on a microchannel reactor.
Background
Wet oxidation is a high concentration oxidation treatment process proposed in the 50 s of the last century, and has been attracting attention from various countries because of its excellent characteristics in treating high concentration, toxic and harmful organic wastewater. The wet oxidation process is a treatment process for oxidizing and decomposing macromolecular organic matters in wastewater into micromolecular organic matters, inorganic matters, carbon dioxide and water under the conditions of high temperature and high pressure. The catalytic wet oxidation method is developed on the basis of the wet oxidation method, and the catalytic wet oxidation method uses a catalyst to catalyze and oxidize organic refractory wastewater so as to solve the problems of high temperature and high pressure, long reaction residence time and the like of the traditional wet oxidation technology.
At present, the wet oxidation technology is basically adopted as a reaction vessel in an autoclave or a tower in actual industry, most of the wet oxidation technology is batch reaction, a series of problems such as low mixing efficiency of oxygen and wastewater exist in application, a great amount of oxygen is wasted, the oxidation efficiency is low, the reaction time is long, and the oxidation time is generally 1-2 hours; the safety is poor, the wet oxidation method is carried out by the traditional equipment intermittently, and some intermediate states in the oxidation process can have higher toxicity; the reaction vessel has large volume, needs larger occupied area, has higher one-time investment, is unfavorable for project implementation, and the like. Catalytic wet oxidation also has a series of problems such as poor catalyst stability, and the catalyst is easy to poison and deactivate due to complex components in the wastewater; the operation cost is high, the catalyst needs to be activated after a period of time for the cyclic use in order to maximize the utilization of resources, and part of the catalyst can be dissolved out in the use process, so that the waste is caused, and the operation cost is high; the secondary pollution caused by the dissolution of the catalyst has influence on the significance of wastewater treatment and the like; the separation of the catalyst from the wastewater is difficult.
Disclosure of Invention
The present invention aims to solve the above problems by providing a system and a method for continuously treating organic wastewater based on a microchannel reactor.
The invention realizes the above purpose through the following technical scheme:
the system for continuously treating organic wastewater based on the microchannel reactor comprises an oxidant storage tank, a wastewater storage tank, a pretreatment device, a heat exchange device and an oxidant preheating device, wherein the pretreatment device comprises a coarse filter, a homogenizing tank, a high-pressure metering pump and a cross heat exchanger, the wastewater storage tank is connected to the coarse filter, the coarse filter is connected to the homogenizing tank, the homogenizing tank is connected to the precise filter through the high-pressure metering pump, the precise filter is connected to the heat exchange device, the heat exchange device is respectively connected to a wastewater microchannel heat exchanger and a back pressure valve, the oxidant storage tank is connected to a one-way valve in the oxidant preheating device, the one-way valve is connected to a pressure reducing valve, the pressure reducing valve is connected to an oxidant microchannel heat exchanger, the oxidant microchannel heat exchanger and the wastewater microchannel heat exchanger are connected to a microchannel mixer, the microchannel mixer is connected to the microchannel reactor, the microchannel reactor is connected to the heat exchange device, the back pressure valve is connected to a gas-liquid separation tank, the gas-liquid separation tank is connected to the heat exchange device, the gas-liquid separation tank is connected to an electric heater, the exhaust gas-liquid separation tank is connected to the electric heater, the exhaust gas-liquid separation device is further connected to the wastewater-absorption device, and the wastewater-gas-liquid heat exchanger forms the wastewater-absorbing device.
In order to further based on the usability of the system for continuously treating organic wastewater by the microchannel reactor, the heat exchange device is a cross heat exchanger.
For further performance of the system for continuously treating organic wastewater based on a microchannel reactor, the electric heater is also connected to the oxidizer microchannel heat exchanger, the microchannel mixer, and the microchannel reactor.
In the system, the method for continuously treating the organic wastewater based on the microchannel reactor comprises the following steps of:
step one: raising the system pressure to a required pressure by using the back pressure valve, and introducing the organic wastewater to be treated from the wastewater storage tank;
step two: removing suspended matters, particulate matters and other impurities from the introduced organic wastewater in the step one through the coarse filter, enabling the residual waste liquid to enter the homogenizing tank to adjust the pH value of the waste liquid, pumping the waste liquid into the precise filter through the high-pressure metering pump, and filtering to obtain pretreated organic wastewater;
step three: performing heat exchange on the pretreated organic wastewater in the second step in the heat exchange device, and then enabling the primarily heated organic wastewater to enter the wastewater microchannel heat exchanger for continuous heating to obtain preheated organic wastewater;
step four: the oxidant in the oxidant storage tank enters the oxidant microchannel heat exchanger through the one-way valve and the pressure reducing valve to be heated, so that preheated oxidant is obtained;
step five: the organic wastewater preheated in the third step and the oxidant preheated in the fourth step are mixed in the microchannel mixer in an intensified and rapid way to obtain mixed liquid, and the mixed liquid enters the microchannel reactor to be subjected to wet oxidation, so that the oxidation is completed to obtain gas-liquid mixed wastewater;
step six: and (3) carrying out heat exchange on the waste water obtained by mixing the gas and the liquid in the step five and the pretreated organic waste water obtained by the step three, carrying out preliminary cooling, then, entering the back pressure valve for decompression, further cooling through the gas-liquid separation tank, separating out tail gas, entering the tail gas absorption tank, and discharging the liquid from a water outlet to obtain treatment liquid for further biochemical treatment or directly discharging after being detected to be qualified.
In this embodiment, the pH in the second step is 4-10.
The invention has the beneficial effects that: the microchannel reactor is a closed system, can avoid contacting highly toxic gas or liquid substances of intermediates in the wastewater treatment process, improves the safety of the wastewater treatment process, realizes intensified oxidation by adding a filler into the microchannel reactor, ensures that gas and liquid are fully mixed all the time in a reaction stage, has better oxidation effect, can directly realize separation from wastewater, shortens the oxidation time by several times (from 1-2h to 20 min) compared with the traditional wet oxidation, realizes continuous and stable operation for wastewater treatment, has good water outlet quality, does not need to use a catalyst, has no secondary pollution, is more environment-friendly, can realize instant uniform mixing, strengthens the wet oxidation for wastewater treatment, can fully contact oxygen with wastewater to strengthen the oxidation wastewater if the filler is added into the microchannel reactor at the same time, improves the oxidation effect, has COD removal rate of more than 95 percent, and realizes biochemical degradation or direct discharge from difficult degradation.
Drawings
FIG. 1 is a system flow diagram of a system and method for continuous treatment of organic wastewater based on a microchannel reactor in accordance with the present invention;
FIG. 2 is a schematic diagram of the system architecture of the system and method for continuous treatment of organic wastewater based on a microchannel reactor of the present invention.
The reference numerals are explained as follows:
1. an oxidant storage tank; 2. a waste water storage tank; 3. a pretreatment device 301, a coarse filter 302, a homogenizing tank 303, a high-pressure metering pump 304 and a precise filter; 4. a heat exchange device; 5. oxidant preheating device 501, check valve 502, relief valve 503, oxidant microchannel heat exchanger; 6. the waste water preheating device 601, the electric heater 602 and the waste water micro-channel heat exchanger; 7. a microchannel mixer; 8. a microchannel reactor; 9. a gas-liquid separation device 901, a back pressure valve 902, a gas-liquid separation tank 903 and a tail gas absorption tank.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1-2, a system for continuously treating organic wastewater based on a microchannel reactor comprises an oxidizer storage tank 1, a wastewater storage tank 2, a pretreatment device 3, a heat exchange device 4 and an oxidizer preheating device 5, the pretreatment device 3 comprises a coarse filter 301, a homogenizing tank 302, a high pressure metering pump 303 and a cross heat exchanger 304, the wastewater storage tank 2 is connected to the coarse filter 301, the coarse filter 301 is connected to the homogenizing tank 302, the homogenizing tank 302 is connected to the fine filter 304 through the high pressure metering pump 303, the fine filter 304 is connected to the heat exchange device 4, the heat exchange device 4 is connected to a wastewater microchannel heat exchanger 602 and a back pressure valve 901, respectively, the oxidizer storage tank 1 is connected to a check valve 501 in the oxidizer preheating device 5, the check valve 501 is connected to the pressure reducing valve 502, the pressure reducing valve 502 is connected to the oxidizer micro-channel heat exchanger 503, the oxidizer micro-channel heat exchanger 503 and the waste water micro-channel heat exchanger 602 are connected to the micro-channel mixer 7, the micro-channel mixer 7 is connected to the micro-channel reactor 8, the micro-channel reactor 8 is connected to the heat exchanging device 4, the back pressure valve 901 is connected to the gas-liquid separation tank 902, the gas-liquid separation tank 902 is connected to the tail gas absorbing tank 903, the back pressure valve 901, the gas-liquid separation tank 902 and the tail gas absorbing tank 903 form a gas-liquid separation device, the waste water micro-channel heat exchanger 602 is also connected with the electric heater 601, and the electric heater 601 and the waste water micro-channel heat exchanger 602 form the waste water preheating device 6.
For further performance of the system for continuous treatment of organic wastewater based on microchannel reactors, the heat exchange means 4 is a cross heat exchanger.
To further the performance of the system for continuously treating organic wastewater based on the microchannel reactor, an electric heater 601 is also connected to the oxidizer microchannel heat exchanger 503, the microchannel mixer 7 and the microchannel reactor 8.
The method for continuously treating organic wastewater based on the microchannel reactor is described below with reference to the examples:
example 1
Step one: selecting waste cutting fluid generated by a certain tire manufacturing enterprise in the production process of the steel wire stay wire, wherein the COD of raw water of the waste cutting fluid is 1.2 multiplied by 105mg/L, the raw water is purple black, and the back pressure valve 901 is used for raising the pressure of the system to 4.5MPa, so that the waste cutting fluid is led in from the waste water storage tank 2;
step two: removing suspended matters, particulate matters and other impurities through a coarse filter 301, uniformly stirring the residual waste liquid in a homogenizing tank 302, adjusting the pH of the waste liquid to 6, pumping the waste liquid into a precision filter 304 through a high-pressure metering pump 303, and filtering to obtain pretreated waste cutting fluid;
step three: the pretreated waste cutting fluid heat exchange device 4 exchanges heat, and then the waste cutting fluid which is primarily heated enters the waste water micro-channel heat exchanger 602 to be continuously heated to 250 ℃ to obtain preheated waste cutting fluid;
step four: oxygen enters an oxygen micro-channel heat exchanger 503 from an oxidant storage tank 1 through a one-way valve 501 and a pressure reducing valve 502 to be heated to 250 ℃ to obtain preheated oxygen;
step five: mixing the preheated waste cutting fluid with oxygen in a microchannel mixer 7, wherein the flow rate of the oxygen is 1.5 times that of the chemical oxygen demand of the wastewater entering at the same time to obtain a mixed fluid, entering a microchannel reactor 8 to perform wet oxidation at 250 ℃, and reacting for 40min to finish oxidation to obtain a gas-liquid mixed waste cutting fluid;
step six: the waste cutting fluid mixed by gas and liquid and the waste cutting fluid after pretreatment are subjected to heat exchange in a heat exchange device 4, the waste cutting fluid is subjected to preliminary cooling and then is decompressed through a back pressure valve BPV-01, the gas and liquid separation tank V-04 is cooled to room temperature, tail gas is separated, the tail gas enters an absorption tank V-05, liquid flows out from a water outlet, the water is light green transparent liquid, the COD of the water detected is 1800mg/L, BOD =678 mg/L, the COD degradation rate is 98.5%, and the water B/C is 0.38, and belongs to biodegradable wastewater.
Example two
Step one: selecting waste cutting fluid generated by an enterprise for producing automobile parts in the production process, wherein the COD of raw water of the waste cutting fluid is 1.6X105 mg/L, the raw water is milky white, after equipment debugging is finished, the system pressure is increased to 6MPa by using a back pressure valve 901, and the waste cutting fluid is led in from a waste water storage tank 2;
step two: removing suspended matters, particulate matters and other impurities through a coarse filter 301, uniformly stirring the residual waste liquid in a homogenizing tank 302, adjusting the pH of the waste liquid to 8, pumping the waste liquid into a precision filter 304 through a high-pressure metering pump 303, and filtering to obtain pretreated waste cutting fluid;
step three: the pretreated waste cutting fluid is subjected to heat exchange in a heat exchange device 4, and then the waste cutting fluid subjected to preliminary heating enters a waste water micro-channel heat exchanger 602 to be continuously heated to 270 ℃ to obtain preheated waste cutting fluid;
step four: oxygen enters an oxidant microchannel heat exchanger 503 from an oxidant storage tank 1 through a one-way valve 501 and a pressure reducing valve 502 to be heated to 270 ℃ to obtain preheated oxygen;
step five: the preheated waste cutting fluid and oxygen are mixed in a micro-channel mixer 7, the flow rate of the oxygen is 2 times that of the chemical oxygen demand of the wastewater entering at the same time, so as to obtain mixed fluid, the mixed fluid enters a micro-channel reactor 8 for wet oxidation at 270 ℃, and the oxidation is completed for 40min, so as to obtain the gas-liquid mixed waste cutting fluid.
Step six: the waste cutting fluid mixed by gas and liquid and the waste cutting fluid after pretreatment are subjected to heat exchange in a heat exchange device 4, the waste cutting fluid is subjected to preliminary cooling and then is decompressed through a back pressure valve 901, the waste cutting fluid is cooled to the room temperature through a gas-liquid separation tank 902, tail gas is separated, the tail gas enters an absorption tank 903, the liquid flows out from a water outlet, and the effluent is light yellow transparent liquid.
In the embodiment, the COD of the water detected by the method is 2520mg/L, BOD =1270 mg/L, the COD degradation rate is 98.3%, and the B/C of the water is 0.50, which belongs to biodegradable wastewater.
Example III
Step one: selecting waste water generated by a dye intermediate production enterprise in the production process, wherein the COD of raw water of the waste water is 3.4 multiplied by 104mg/L, the raw water is reddish brown, and after equipment debugging is finished, using a back pressure valve 901 to raise the pressure of the system to 9MPa, and introducing the waste water from a waste water storage tank 2;
step two: removing suspended matters, particulate matters and other impurities through a coarse filter 301, uniformly stirring the residual waste liquid in a homogenizing tank 302, adjusting the pH of the waste liquid to 7, pumping the waste liquid into a precise filter 304 through a high-pressure metering pump 303, and filtering to obtain pretreated waste water;
step three: the pretreated wastewater is subjected to heat exchange in a heat exchange device 4, and then the primarily heated wastewater enters a wastewater microchannel heat exchanger 602 to be continuously heated to 300 ℃ to obtain preheated wastewater;
step four: oxygen enters an oxidant microchannel heat exchanger 503 from an oxidant storage tank 1 through a one-way valve 501 and a pressure reducing valve 502 to be heated to 300 ℃ to obtain preheated oxygen;
step five: the preheated wastewater is mixed with oxygen in a microchannel mixer 7, the flow rate of the oxygen is 2 times that of chemical oxygen demand of the wastewater entering at the same time, and mixed liquid is obtained; the mixed solution enters a micro-channel reactor 8 to be subjected to wet oxidation at 300 ℃ and react for 20min to obtain gas-liquid mixed wastewater;
step six: the waste water mixed by gas and liquid and the waste water after pretreatment are subjected to heat exchange in a heat exchange device 4, the waste water is subjected to preliminary cooling and then is decompressed through a back pressure valve 901, the waste water is cooled to the room temperature through a gas-liquid separation tank 902, tail gas is separated, the tail gas enters a tail gas absorption tank 903, liquid flows out from a water outlet, and the effluent is light yellow transparent liquid.
In the embodiment, the COD=271 mg/L of water is detected, the COD degradation rate is 99.2%, and the water can be directly discharged into a municipal pipe network.
Example IV
Step one: selecting waste water generated by a pesticide production enterprise in the production process, wherein the COD of raw water of the waste water is 5 multiplied by 104mg/L, the raw water is brown, after equipment debugging is finished, the system pressure is increased to 9MPa by using a back pressure valve 901, and the waste water is led in from a waste water storage tank 2;
step two: removing suspended matters, particulate matters and other impurities through a coarse filter 301, uniformly stirring the residual waste liquid in a homogenizing tank 302, adjusting the pH of the waste liquid to 8, pumping the waste liquid into a precise filter 304 through a high-pressure metering pump 303, and filtering to obtain pretreated waste water;
step three: the pretreated wastewater enters a heat exchange device 4 for heat exchange, and then the primarily heated wastewater enters a wastewater microchannel heat exchanger 602 for continuous heating to 300 ℃ to obtain preheated wastewater;
step four: oxygen enters an oxidant microchannel heat exchanger 503 from an oxidant storage tank 1 through a one-way valve 501 and a pressure reducing valve 502 to be heated to 300 ℃ to obtain preheated oxygen;
step five: the preheated wastewater is mixed with oxygen in a microchannel mixer 7, the flow rate of the oxygen is 1.8 times of the chemical oxygen demand of the wastewater entering at the same time, and a mixed solution is obtained; the mixed solution enters a micro-channel reactor 8 to be subjected to wet oxidation at 300 ℃ and react for 20min to obtain gas-liquid mixed wastewater;
step six: the waste water mixed by gas and liquid and the waste water after pretreatment are subjected to heat exchange in a heat exchange device 4, the waste water is subjected to preliminary cooling and then is decompressed through a back pressure valve 901, the waste water is cooled to the room temperature through a gas-liquid separation tank 902, tail gas is separated, the tail gas enters a tail gas absorption 903, liquid flows out from a water outlet, and the effluent is light yellow transparent liquid.
In the embodiment, the detected water COD=948mg/L, BOD =427 mg/L has a COD degradation rate of 98.1% and the water B/C=0.45, and belongs to biodegradable wastewater.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and their equivalents.
Claims (5)
1. The system for continuously treating the organic wastewater based on the microchannel reactor comprises an oxidant storage tank, a wastewater storage tank, a pretreatment device, a heat exchange device and an oxidant preheating device, and is characterized in that: the pretreatment device comprises a coarse filter, a homogenizing tank, a high-pressure metering pump and a heat exchange device, wherein the waste water storage tank is connected to the coarse filter, the coarse filter is connected to the homogenizing tank, the homogenizing tank is connected to a precise filter through the high-pressure metering pump, the precise filter is connected to the heat exchange device, the heat exchange device is respectively connected to a waste water micro-channel heat exchanger and a back pressure valve, the oxidant storage tank is connected to a one-way valve in the oxidant preheating device, the one-way valve is connected to a pressure reducing valve, the pressure reducing valve is connected to the oxidant micro-channel heat exchanger, the oxidant micro-channel heat exchanger and the waste water micro-channel heat exchanger are connected to a micro-channel mixer, the micro-channel mixer is connected to a micro-channel reactor, the micro-channel reactor is connected to the heat exchange device, the back pressure valve is connected to a gas-liquid separation tank, the gas-liquid separation tank is connected to a tail gas absorption tank, the back pressure valve, the gas-liquid separation tank and the tail gas absorption tank form a gas-liquid separation device, the waste water micro-channel heat exchanger and the waste water micro-channel heat exchanger are also connected to an electric heater, and the waste water micro-channel heat exchanger form the waste water heater.
2. The system for continuously treating organic wastewater based on a microchannel reactor according to claim 1, wherein: the heat exchange device is a cross heat exchanger.
3. The system for continuously treating organic wastewater based on a microchannel reactor according to claim 1, wherein: the electric heater is also connected to the oxidant microchannel heat exchanger, the microchannel mixer and the microchannel reactor.
4. A method for continuous treatment of organic wastewater based on a microchannel reactor according to claim 3, wherein: the method comprises the following steps: step one: raising the system pressure to a required pressure by using the back pressure valve, and introducing the organic wastewater to be treated from the wastewater storage tank; step two: removing suspended matters and particulate impurities from the introduced organic wastewater in the step one through the coarse filter, enabling the residual waste liquid to enter the homogenizing tank to adjust the pH value of the waste liquid, pumping the waste liquid into the precise filter through the high-pressure metering pump, and filtering to obtain pretreated organic wastewater; step three: performing heat exchange on the pretreated organic wastewater in the second step in the heat exchange device, and then enabling the primarily heated organic wastewater to enter the wastewater microchannel heat exchanger for continuous heating to obtain preheated organic wastewater; step four: the oxidant in the oxidant storage tank enters the oxidant microchannel heat exchanger through the one-way valve and the pressure reducing valve to be heated, so that preheated oxidant is obtained; step five: the organic wastewater preheated in the third step and the oxidant preheated in the fourth step are mixed in the microchannel mixer in an intensified and rapid way to obtain mixed liquid, and the mixed liquid enters the microchannel reactor to be subjected to wet oxidation, so that the oxidation is completed to obtain gas-liquid mixed wastewater; step six: and (3) carrying out heat exchange on the waste water obtained by mixing the gas and the liquid in the step five and the pretreated organic waste water obtained by the step three, carrying out preliminary cooling, then, entering the back pressure valve for decompression, further cooling through the gas-liquid separation tank, separating out tail gas, entering the tail gas absorption tank, and discharging the liquid from a water outlet to obtain treatment liquid for further biochemical treatment or directly discharging after being detected to be qualified.
5. The method for continuously treating organic wastewater based on a microchannel reactor according to claim 4, wherein: the pH value in the second step is 4-10.
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| CN109704426A (en) * | 2019-02-25 | 2019-05-03 | 南京新奥环保技术有限公司 | A kind of used cutting liquid and emulsification liquid treating system |
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