CN111018225A - Fenton method wastewater treatment process and device under high temperature and high pressure - Google Patents
Fenton method wastewater treatment process and device under high temperature and high pressure Download PDFInfo
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/02—Fluid flow conditions
- C02F2301/026—Spiral, helicoidal, radial
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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Abstract
The invention provides a Fenton method wastewater treatment process and a device under high temperature and high pressure, wherein the treatment process comprises the following steps: adjusting the pH value of the wastewater, adding a catalyst, preheating, introducing air, increasing the pressure to 0.3-1.6 Mpa, heating to 130-200 ℃, adding hydrogen peroxide for Fenton reaction, finally adjusting the pH value to be neutral by flocculation precipitation, standing and layering to obtain supernatant and sludge. The invention has the advantages that: the treatment effect is improved by 15-30% compared with that of the traditional method, the method has a good removal effect on some organic matters which are difficult to degrade, and the treatment load of the subsequent process is reduced; the reaction speed is high, the size of the used equipment is small, and the dosage of the medicament and the generation amount of the iron mud are obviously reduced.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a Fenton method wastewater treatment process and device under high temperature and high pressure.
Background
The Fenton treatment of the wastewater treatment is to add Fe2+ (ferrous ions) and hydrogen peroxide into the wastewater, react Fe2+ with the hydrogen peroxide to generate hydroxyl radicals, and degrade organic matters in the wastewater by utilizing the hydroxyl radicals. The reaction is carried out at normal temperature, the process of generating hydroxyl radicals by the reaction of Fe2+ and hydrogen peroxide is slow, generally 30-60 min, only one part of the hydrogen peroxide is used for degrading organic matters in wastewater, and the other part of the hydrogen peroxide is captured by the hydrogen peroxide before degrading the organic matters, so that the hydroxyl radicals used for degrading the organic matters are reduced, and the utilization rate is reduced. The equipment size is large and the running cost is high. Therefore, the invention particularly discloses a sewage treatment process under high temperature and high pressure to better operate.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a technology for treating wastewater by a Fenton method under high temperature and high pressure, the invention can react quickly, the using amount of an oxidant is small, and the output of sludge can be greatly reduced.
The technical scheme provided by the invention is as follows:
the Fenton method wastewater treatment process under high temperature and high pressure comprises the following steps:
a. adding an acidic substance into the wastewater, and adjusting the pH value of the wastewater to be 2.6-3.4;
b. adding Fe2+ into the wastewater obtained in the step a;
c. b, inputting the wastewater obtained in the step b into a heat exchanger for preheating;
d. c, conveying the wastewater obtained in the step c into a reactor by a high-pressure pump;
e. introducing compressed air into the reactor for boosting pressure, and keeping the pressure in the reactor at 0.3-1.6 Mpa;
f. e, heating the wastewater obtained in the step e, and keeping the temperature in the reactor at 130-200 ℃;
g. adding an oxidant into the wastewater obtained in the step f to carry out Fenton reaction under the high-temperature and high-pressure state;
h. inputting the wastewater obtained in the step g into a flocculation sedimentation tank, adding a coagulant aid, adjusting the pH value to be neutral, and standing and layering the wastewater to obtain supernatant and sludge;
i. and (e) conveying the supernatant obtained in the step h to a subsequent treatment system, and transferring the sludge to a sludge collection tank.
In the step d, the wastewater is conveyed from the bottom of the reactor by a high-pressure pump, a spiral baffle plate is arranged in the reactor, and water flow spirally rises from bottom to top.
Specifically, in the step f, the feeding method of the oxidant is uniform-speed jet feeding.
Specifically, in the step e, the coagulant aid is calcium hydroxide.
The invention also provides a Fenton method wastewater treatment device under high temperature and high pressure,
comprises a pH adjusting tank, a heat exchanger, a high-pressure pump and a reactor; the material inlet of heat exchanger is connected to the pH adjusting tank, the material inlet of high-pressure pump intercommunication reactor is passed through to the material export of heat exchanger, sets up the spiral baffling board in the reactor, and the top of reactor communicates compressed air intake pipe, and the upper portion intercommunication steam pipe of reactor is provided with the heating jacket on the outer wall of reactor, and the oxidant high-pressure pump intercommunication oxidant inlet pipe is passed through to the lower part of reactor.
Specifically, the heating jacket intercommunication has the heating jacket inlet tube, and the heating jacket passes through the heating jacket outlet pipe and communicates with the water inlet of heat exchanger, and the heat exchanger still communicates with the heat exchanger outlet pipe.
Specifically, a pipeline between the reactor and the oxidant high-pressure pump is inserted into the reactor, and the outer surface of the pipeline is provided with a heat-insulating material.
Specifically, the top of the reactor is also provided with a safety valve, a temperature sensor and an automatic pressure regulating valve.
Specifically, the pH value adjusting tank is communicated with an acid feeding pipe and a Fe2+ feeding pipe, and a stirrer is arranged on the pH value adjusting tank.
The wastewater treatment method provided by the invention has the following beneficial effects:
1) compared with a wastewater treatment method under the condition of low temperature and low pressure, the treatment effect of the method is improved by 15-30%, the method has a good removal effect on some refractory organic matters, and the treatment load of a subsequent process is reduced;
2) in order to ensure that Fe2+ in the wastewater fully reacts with the oxidant, the spiral baffle plate is arranged in the reactor, and water flow spirally rises from bottom to top, so that the reaction is quick, the reaction time of the invention is only 60-300 seconds for the reaction of Fe2+ with the oxidant to generate hydroxyl radicals, and the size of related equipment can be correspondingly reduced;
3) the dosage of the oxidant is 3/5 of dosage under the condition of low temperature and low pressure, the dosage of the catalyst is 2/5 of dosage under the condition of low temperature and low pressure, and the dosage of the medicament is obviously reduced;
4) the invention has the advantages of low iron mud yield, 1/2 reduction compared with the traditional method, reduced reaction time of the flocculation sedimentation tank and reduced tank capacity.
Drawings
FIG. 1 is a schematic view showing the construction of a wastewater treatment apparatus according to the present invention, which is a Fenton process at high temperature and high pressure;
the device comprises a pH value adjusting tank 1, an acid feeding pipe 2, a Fe2+ feeding pipe 3, a stirrer 4, a heat exchanger 5, a high-pressure pump 6, an oxidant feeding pipe 7, an oxidant high-pressure pump 8, a heat insulating material 9, a heating jacket 10, a heating jacket water inlet pipe 11, a steam pipe 12, a compressed air inlet pipe 13, a safety valve 14, a temperature sensor 15, an automatic pressure adjusting valve 16, a reactor 17, a spiral baffle plate 18, a heating jacket water outlet pipe 19 and a heat exchanger water outlet pipe 20.
Detailed Description
The Fenton method effluent treatment plant under the high-temperature high-pressure, including pH regulating tank 1, heat exchanger 5, high-pressure pump 6 and reactor 17; the pH adjusting tank 1 is connected with a material inlet of a heat exchanger 5, a material outlet of the heat exchanger 5 is communicated with a material inlet of a reactor 17 through a high-pressure pump 6, a spiral baffle plate 18 is arranged in the reactor 17, the top of the reactor 17 is communicated with a compressed air inlet pipe 13, the upper part of the reactor 17 is communicated with a steam pipe 12, a heating sleeve 10 is arranged on the outer wall of the reactor 17, and the lower part of the reactor 17 is communicated with an oxidant inlet pipe 7 through an oxidant high-pressure pump 8.
The heating jacket 10 is communicated with a heating jacket water inlet pipe 11, the heating jacket 10 is communicated with a water inlet of the heat exchanger 5 through a heating jacket water outlet pipe 19, and the heat exchanger 5 is further communicated with a heat exchanger water outlet pipe 20.
The pipe between the reactor 17 and the high-pressure oxidant pump 8 is inserted into the reactor 17 and its outer surface is provided with a heat insulating material 9.
The top of the reactor 17 is also provided with a safety valve 14, a temperature sensor 15 and a pressure automatic regulating valve 16.
The pH value adjusting tank 1 is communicated with an acid feeding pipe 2, a Fe2+ feeding pipe 3, and a stirrer 4 is arranged on the pH value adjusting tank 1.
The device is adopted to carry out wastewater treatment operation.
The Fenton method wastewater treatment process under high temperature and high pressure comprises the following steps,
a. adding an acidic substance into the wastewater in the pH adjusting tank 1 through the acid feeding pipe 2 under the condition that the stirrer 4 is started, and adjusting the pH value of the wastewater to be 2.6-3.4;
b. adding Fe into the wastewater obtained in the step a through a Fe2+ feeding pipe 32+；
c. C, preheating the waste water obtained in the step b by using a heat exchanger 5;
d. c, conveying the wastewater obtained in the step c into a reactor 17 by a high-pressure pump 6;
e. introducing compressed air into the reactor 17 through a compressed air inlet pipe 13, and automatically adjusting the pressure by a pressure automatic adjusting valve 16 to keep the pressure in the reactor 17 at 0.3-1.6 Mpa;
f. e, monitoring the temperature of the wastewater obtained in the step e in real time by a temperature sensor 15 arranged on a reactor 17, introducing steam into the reactor 17 by a steam pipe 12, and heating the wastewater to 130-200 ℃ by a heating sleeve 10;
g. d, injecting an oxidant into the wastewater obtained in the step f through an oxidant feeding pipe 7 provided with a heat preservation measure by an oxidant high-pressure pump 8, so that the wastewater is subjected to a Fenton reaction in a high-temperature and high-pressure state;
h. inputting the wastewater obtained in the step g into a flocculation sedimentation tank, adding a coagulant aid, adjusting the pH value to be neutral, and standing and layering the wastewater to obtain supernatant and sludge;
i. and (e) conveying the supernatant obtained in the step h to a subsequent treatment system, and transferring the sludge to a sludge collection tank.
In order to verify the practical effect of the present invention, the inventors have verified through comparative experiments.
In the embodiment, the device and the process are adopted for wastewater treatment, the reaction time and the retention time are controlled under the conditions of selecting the same medicine substances and adding the medicine amount, different reaction pressures and reaction temperatures are adjusted, and finally the measurement result of the effluent quality is obtained. Comparative example only the reaction pressure and reaction temperature were adjusted, and the apparatus and process used were the same as in the examples. Wherein the acidic substance is 1+1HCL solution, and the iron ion source is ferric sulfate. The oxidant is 30 percent of hydrogen peroxide by mass fraction. The coagulant aid is calcium hydroxide.
Because the temperature is higher than 50 ℃, the hydrogen peroxide can be decomposed quickly, and in order to utilize the hydrogen peroxide more fully, a heat preservation measure is arranged before the hydrogen peroxide contacts the wastewater, so that the temperature of the hydrogen peroxide is not higher than 50 ℃, and heat preservation treatment can be carried out by using a circulating water sleeve or a heat preservation material.
The same wastewater was used in the examples and comparative examples, and the water quality index of the wastewater is shown in the following table.
The following table shows the parameter conditions and the indexes of effluent quality of the examples and the comparative examples.
Finally, it should be noted that: the above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Variations or modifications in different forms may occur to those skilled in the art upon reading the foregoing description. It is not necessary or necessary to exhaustively enumerate all embodiments herein, and obvious variations or modifications can be made without departing from the scope of the invention.
Claims (9)
1. The Fenton method wastewater treatment process under high temperature and high pressure is characterized by comprising the following steps:
a. adding an acidic substance into the wastewater, and adjusting the pH value of the wastewater to be 2.6-3.4;
b. adding Fe2+ into the wastewater obtained in the step a;
c. b, inputting the wastewater obtained in the step b into a heat exchanger for preheating;
d. c, conveying the wastewater obtained in the step c into a reactor by a high-pressure pump;
e. introducing compressed air into the reactor for boosting pressure, and keeping the pressure in the reactor at 0.3-1.6 Mpa;
f. e, heating the wastewater obtained in the step e, and keeping the temperature in the reactor at 130-200 ℃;
g. adding an oxidant into the wastewater obtained in the step f to carry out Fenton reaction under the high-temperature and high-pressure state;
h. inputting the wastewater obtained in the step g into a flocculation sedimentation tank, adding a coagulant aid, adjusting the pH value to be neutral, and standing and layering the wastewater to obtain supernatant and sludge;
i. and (e) conveying the supernatant obtained in the step h to a subsequent treatment system, and transferring the sludge to a sludge collection tank.
2. A Fenton's method wastewater treatment process at high temperature and high pressure according to claim 1,
in the step d, the wastewater is conveyed from the bottom of the reactor by a high-pressure pump, a spiral baffle plate is arranged in the reactor, and the water flow spirally rises from bottom to top.
3. A Fenton's method wastewater treatment process at high temperature and high pressure according to claim 1,
in the step f, the feeding method of the oxidant is uniform-speed jet feeding.
4. A Fenton's method wastewater treatment process at high temperature and high pressure according to claim 1,
in the step e, the coagulant aid is calcium hydroxide.
5. The Fenton method wastewater treatment device under high temperature and high pressure is characterized by comprising a pH adjusting tank (1), a heat exchanger (5), a high-pressure pump (6) and a reactor (17); the material inlet of heat exchanger (5) is connected in pH adjusting tank (1), the material export of heat exchanger (5) passes through the material inlet of high-pressure pump (6) intercommunication reactor (17), set up spiral baffling board (18) in reactor (17), top intercommunication compressed air intake pipe (13) of reactor (17), the upper portion intercommunication steam pipe (12) of reactor (17), be provided with on the outer wall of reactor (17) heating jacket (10), oxidant high-pressure pump (8) intercommunication oxidant inlet pipe (7) are passed through to the lower part of reactor (17).
6. A Fenton's method wastewater treatment device under high temperature and high pressure according to claim 5, characterized in that the heating jacket (10) is communicated with a heating jacket inlet pipe (11), the heating jacket (10) is communicated with the water inlet of the heat exchanger (5) through a heating jacket outlet pipe (19), and the heat exchanger (5) is also communicated with a heat exchanger outlet pipe (20).
7. A Fenton's process wastewater treatment plant at high temperature and high pressure according to claim 5, characterized in that a pipe between the reactor (17) and the high pressure oxidant pump (8) is inserted into the reactor (17) and the outer surface thereof is provided with a heat insulating material (9).
8. A Fenton's method wastewater treatment device under high temperature and high pressure according to claim 5, characterized in that the top of the reactor (17) is further provided with a safety valve (14), a temperature sensor (15) and an automatic pressure regulating valve (16).
9. A Fenton's method wastewater treatment plant under high pressure and high temperature according to claim 5, characterized in that the pH value adjusting tank (1) is communicated with the acid feeding pipe (2) and the Fe2+ feeding pipe (3), and the pH value adjusting tank (1) is provided with a stirrer (4).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113526768A (en) * | 2021-08-09 | 2021-10-22 | 天俱时工程科技集团有限公司 | Micro-nano bubble high-temperature Fenton-like water treatment process and equipment thereof |
| CN113582323A (en) * | 2021-06-30 | 2021-11-02 | 石家庄新奥环保科技有限公司 | Automatic Fenton reaction device and control method |
| CN114620822A (en) * | 2022-03-16 | 2022-06-14 | 湖南金益环保股份有限公司 | Fenton process and reaction system thereof |
| CN115626743A (en) * | 2022-11-10 | 2023-01-20 | 华夏碧水环保科技股份有限公司 | Treatment method of pyridine-containing wastewater |
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Cited By (5)
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