CN112723489B - Continuous ferroelectric chemical-heterogeneous Fenton water treatment device and application - Google Patents
Continuous ferroelectric chemical-heterogeneous Fenton water treatment device and application Download PDFInfo
- Publication number
- CN112723489B CN112723489B CN202011448040.4A CN202011448040A CN112723489B CN 112723489 B CN112723489 B CN 112723489B CN 202011448040 A CN202011448040 A CN 202011448040A CN 112723489 B CN112723489 B CN 112723489B
- Authority
- CN
- China
- Prior art keywords
- section
- heterogeneous fenton
- wastewater
- water treatment
- chemical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a continuous ferroelectric chemical-heterogeneous Fenton water treatment device and application thereof. Along the flow direction, the channel is divided into three sections, namely a front section, a middle section and a rear section, wherein the front section is a section for generating magnetic ferroferric oxide by electric flocculation, the middle section is a section for generating hydroxyl free radicals by heterogeneous Fenton, and the rear section is a section for adsorbing pollutants by the magnetic ferroferric oxide. In the former stage, the residence time of the wastewater is 20-120 min, the pH value is adjusted to 3-6, and the DO value of dissolved oxygen is controlled to be 1.8-9.6 mg/L. The pH value of the middle section is adjusted to 6-7, the adding dosage of the flocculant is 1-15 ppm, and the adding dosage of the hydrogen peroxide solution is 30-50 mg/L. And in the later stage, the pH is regulated to 6-8, and the adding dosage of the flocculant is 3-12 ppm. The electromagnet at the bottom of the front section of the channel sends the floccule to the middle and rear sections through power on and power off. The invention has the advantages of realizing the synergistic effect of floc adsorption and hydroxyl radical oxidation on pollutants and improving the removal rate of COD.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to a continuous ferroelectric chemical-heterogeneous Fenton water treatment device and application thereof.
Background
The sewage treatment method includes physical method, chemical method and biological method. Physical methods include precipitation, centrifugation, and flotation. Examples of the chemical method include coagulation and chemical precipitation. The biological method is mostly an activated sludge method, a biological membrane method, and the like. However, these methods have poor sewage treatment effect.
The ferroelectric chemistry technology is a green and low-cost water treatment technology, metal ions are mainly generated through a sacrificial anode (the anode generally adopts an iron plate or an aluminum plate), the metal ions are hydrolyzed or react with hydroxide in solution to form hydroxide and polyhydroxy complex flocculant, finally metal hydroxide floccules are formed, and suspended matters, heavy metal ions and the like in water are removed through adsorption, net capturing and bridging and coprecipitation; and simultaneously, the flocs with smaller size can be adsorbed on hydrogen bubbles generated by the cathode so as to generate an air floatation effect, thereby achieving the purpose of separation.
The electric flocculation technology is the combination of chemical flocculation and electrochemistry, has high pollutant removal efficiency, simple equipment, no external dosing agent and no secondary pollution. But the strong oxidizing free radical generated in the electric flocculation process is limited, and the effect of treating sewage containing nondegradable pollutants is poor.
Heterogeneous Fenton technology is also called Fenton-like technology, and is a technology for mineralizing organic matters by catalyzing and decomposing hydrogen peroxide by using a solid-phase catalyst mainly comprising iron oxide to generate hydroxyl free radicals. Compared with the traditional homogeneous Fenton, the heterogeneous Fenton has the advantages that the applicable pH range is wider, no secondary pollution of iron mud exists, and the catalyst can be mostly recycled. Magnetic ferroferric oxide as a mixed valence iron oxide (Fe present 2+ And Fe (Fe) 3+ ) The magnetic ferroferric oxide can be used as a catalyst for heterogeneous Fenton reaction, has paramagnetic property, is easy to recover and separate, and can be recycled after recovery.
At present, magnetic ferroferric oxide is not generally generated in situ as a heterogeneous Fenton catalyst, and is mostly synthesized by other chemical methods and then added into a reaction system, so that the content of hydroxyl free radicals generated in the reaction process is still small. In the ferroelectric chemistry process, the magnetic ferroferric oxide can be accurately and massively produced in situ, and the in-situ produced magnetic ferroferric oxide has larger specific surface area and rich active sites, and can be used for in-situ on-line catalytic decomposition of hydrogen peroxide to generate more hydroxyl free radicals.
Therefore, there is a strong need for a water treatment method which effectively solves the problems of limited generation of strong oxidative free radicals, poor sewage treatment effect when hydroxyl free radicals and floc adsorption are independently acted, and the like.
Disclosure of Invention
The first object of the present invention is to provide a continuous ferroelectric chemical-heterogeneous Fenton water treatment device which has a simple structure and can improve water treatment efficiency.
The second object of the invention is to provide the application of the continuous ferroelectric chemical-heterogeneous Fenton water treatment device in sewage treatment.
A continuous ferroelectric chemical-heterogeneous Fenton water treatment device comprises an electrolytic tank, wherein a cathode and an anode are relatively fixed in the electrolytic tank, and the distance between the anode and the cathode is 1-30 cm; the channel in the electrolytic tank is divided into a front section, a middle section and a rear section by 2 baffles, wherein the front section is a region for accurately generating magnetic ferroferric oxide in situ, the middle section is a region for generating hydroxyl free radicals by heterogeneous Fenton, and the rear section is a region for adsorbing pollutants by the magnetic ferroferric oxide; the front section accounts for 35-45% of the total length of the channel in the electrolytic tank, an electromagnet is fixed on the outer surface of the bottom of the electrolytic tank corresponding to the front section, and the electromagnet is controlled to slide on the outer surface of the bottom of the electrolytic tank corresponding to the front section, the middle section and the rear section through an external power supply.
The anode is an iron electrode, the cathode is an iron electrode, stainless steel, a carbon electrode or a titanium electrode, and the anode and the cathode are in flat plates, porous or granular patterns.
As an improvement, the moving speed of the electromagnet is 1-5 m/min, and the working frequency is 10-20 times/min.
The application of the continuous ferroelectric chemical-heterogeneous Fenton-based water treatment device in sewage treatment comprises the following steps:
As an improvement, the sewage is urban domestic sewage or chemical plant sewage; and the COD content is 100-10000 mg/L.
As an improvement, when the wastewater is urban domestic wastewater, the pH value of the wastewater at the later stage needs to be adjusted to 7-8; when the wastewater is the wastewater of a chemical plant, the pH value of the wastewater at the later stage is required to be adjusted to be 6-7; the reagent used for regulating the pH is hydrochloric acid and sodium hydroxide, and the added dosage is 10-30 mg/L.
As an improvement, the flocculant is polyaluminum trichloride or PAM.
As an improvement, the aeration rate of the oxygen introduced into the front section is 0.1-10L/min.
As an improvement, the salt ion reagent is ferrous chloride or ferrous sulfate.
The invention cooperatively processes wastewater pollutants by coupling a ferroelectric chemistry technology and a heterogeneous Fenton technology. The front section of the channel generates magnetic ferroferric oxide and limited hydroxyl radical (OH) and superoxide radical (O) in situ 2 - ) And the like, and simultaneously, the magnetic ferroferric oxide generated in situ is sent into the middle section and the rear section under the attraction action of the bottom electromagnet. The middle-section magnetic ferroferric oxide can be used for in-situ on-line catalytic decomposition of hydrogen peroxide to generate a large amount of oxidative hydroxyl free radicals, and can be used for directly oxidizing pollutants or completely mineralizing the pollutants into carbon dioxide, water and inorganic salts, so that favorable conditions are provided for removing the pollutants by adsorbing the latter-section flocs. In situ generation of magnetic tetraoxide with high specific surface area and high active sites by Electroflocculation (EC)Iron adsorbs contaminants, producing strongly oxidative hydroxyl radical mineralized contaminants by heterogeneous Fenton. The mineralization and in-situ adsorption treatment of pollutants are realized under the synergistic effect of the two mechanisms, so that the sewage treatment efficiency is improved, and the problem that pure electric flocculation generates strong oxidative free radicals is limited can be solved.
The beneficial effects are that:
compared with the prior art, the invention has the remarkable advantages that the ferroferric oxide can be accurately produced in situ by ferroelectric chemistry, the in situ produced magnetic ferroferric oxide has larger specific surface area and more active sites, and the specific surface area of the magnetic ferroferric oxide is 100-130 m by the BET (specific surface area test method) 2 The catalyst can be used for in-situ on-line catalytic decomposition of hydrogen peroxide to generate more hydroxyl free radicals, and the sewage treatment effect is better under the adsorption effect of flocs and the strong oxidation effect of the hydroxyl free radicals; meanwhile, the treatment method is simple, can overcome the problem of anode passivation to a certain extent, and reduces energy consumption.
Drawings
FIG. 1 is a schematic diagram of a continuous ferroelectric chemical-heterogeneous Fenton water treatment device, wherein a 1-anode, a 2-cathode, a 3-baffle plate and a 4-electromagnet are adopted, a 5-front section, a 6-middle section, a 7-rear section and an 8-channel water inlet are adopted, and a 9 is a channel water outlet;
fig. 2 is a top view showing the structure of the continuous ferroelectric chemical-heterogeneous Fenton water treatment device according to the present invention.
Detailed description of the preferred embodiments
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings and the examples.
As shown in fig. 1-2, a continuous ferroelectric chemical-heterogeneous Fenton water treatment device comprises a channel formed by an anode 1, a cathode 2 and a baffle 3, wherein an electrolytic channel is formed between the cathode and the anode; the anode adopts an iron electrode, and the cathode adopts an iron electrode, stainless steel, a carbon electrode or a titanium electrode; the anode electrode or the cathode electrode is a flat plate, porous or granular; the spacing between the anode and the cathode is 1-30 cm. The connection modes of the uncommitted components in the device refer to the existing processing means in the field of the device.
In fig. 1-2, 4 is an electromagnet, 5 is a front section, namely an electroflocculation magnetic ferroferric oxide production section, 6 is a middle section, namely a heterogeneous Fenton hydroxyl radical production section, 7 is a rear section, namely a magnetic ferroferric oxide pollutant adsorption section, 8 is a channel water inlet, and 9 is a channel water outlet. Wherein 5 in the figure: the length of the front section for generating magnetic ferroferric oxide in situ accounts for 35-45% of the total length of the channel.
Reagents for adjusting pH: the front stage has higher concentration of iron ions, lower hydrolysis reaction rate of iron ions and lower concentration of hydrolysis products. The front section is therefore dominated by electrolytic iron ions. In an acidic system, the dissolution of iron is facilitated, so that the pH value of the solution is reduced, and the pH value is adjusted to 3-6 at an inlet; the middle section, heterogeneous Fenton can react under neutral condition, so that the inlet is adjusted to 6-7; the magnetic ferroferric oxide in-situ adsorbs pollutants at the rear stage, and the adsorption effect is better under the alkaline condition, so that the magnetic ferroferric oxide is regulated to 7-8 at the inlet.
Flocculant: in order to improve the adsorption efficiency of the flocs to pollutants in the electric flocculation process and reduce the occurrence of the magnetic ferroferric oxide agglomeration phenomenon in the heterogeneous Fenton process, the dispersed flocs are required to be coagulated to form larger more dispersed flocs, so that a flocculating agent is required to be added.
Salt ion reagent: ferric salt is additionally added in the front section of the channel to improve the concentration of ferric ions, so that higher hydroxide floc yield and heterogeneous Fenton hydroxyl radical yield are realized.
Example 1
Treating urban domestic sewage with continuous ferroelectric chemical-heterogeneous Fenton water treatment technology, wherein the initial COD is 100mg/L, the cathode and anode adopt iron electrodes, the retention time is 20min, the electrode voltage is 3V, and the electrode current density is 0.5mA/cm 2 . From the inlet to the outlet can be divided into three sections,
front section: adding hydrochloric acid to adjust pH to 4, adding oxygen to control the dissolved oxygen DO value of the solution to be 1.6mg/L through an aeration device, wherein the aeration rate is 0.5L/min, adding ferrous chloride, and the dosage is 6ppm; the conductivity was adjusted to 500. Mu.s/cm and the electrolyte anion carbonate, sulfate and phosphate ion concentrations were 100ppm;
middle section: adding hydrochloric acid to adjust pH to 6, adding flocculant polyaluminium trichloride at a dosage of 1ppm, adding hydrogen peroxide solution at a concentration of 30mg/L,
the rear section: adding hydrochloric acid and sodium hydroxide to adjust pH to 7, adding flocculant PAM at a dosage of 10mg/L, adding flocculant PAM at a dosage of 3ppm,
the working parameters of the electromagnet are as follows: the moving speed of the electromagnet is 1m/min, and the working frequency is 10 times/min.
The content of COD in the municipal domestic sewage detected at the outlet is 19.8mg/L, and the removal rate of COD is 81.2%.
Comparative example 1
Under the same background parameters, the urban domestic sewage is treated by ferroelectric chemistry and heterogeneous Fenton technology respectively. Under ferroelectric chemical treatment, the content of COD in the municipal domestic sewage detected by the outlet is 34.5mg/L, and the removal rate of COD is 65.5%. Under the heterogeneous Fenton method treatment, the content of COD in the urban domestic sewage detected by the outlet is 29.7mg/L, and the removal rate of COD is 70.3%.
Under the synergistic effect of floc adsorption and hydroxyl radical oxidation, the ferroelectric chemistry-heterogeneous Fenton coupling technology can effectively improve the sewage treatment effect.
Example 2
Treating urban domestic sewage with continuous ferroelectric chemical-heterogeneous Fenton water treatment technology, wherein the initial COD is 10000mg/L, the cathode and anode adopt iron electrodes, the residence time is 60min, the electrode voltage is 10V, and the electrode current density is 10mA/cm 2 . From the inlet to the outlet, three sections can be divided:
front section: adding hydrochloric acid to adjust pH to 6, adding oxygen to control the dissolved oxygen DO value of the solution to 9.8mg/L through an aeration device, wherein the aeration rate is 10L/min, adding ferrous chloride to adjust the dosage to 20ppm, the conductivity to 5000 mu s/cm, and the concentration of electrolyte anions carbonate, sulfate radical and phosphate radical ions to 10000ppm;
middle section: adding hydrochloric acid and sodium hydroxide to adjust the pH to 7, adding flocculant polyaluminium trichloride, adding 10ppm of the flocculant, and adding hydrogen peroxide solution to the concentration of 50mg/L;
the rear section: adding sodium hydroxide to adjust the pH to 8, wherein the dosage is 30mg/L, adding flocculant PAM and the dosage is 12ppm;
the working parameters of the electromagnet are as follows: the moving speed of the electromagnet is 5m/min, and the working frequency is 20 times/min.
The content of COD in the urban domestic sewage detected at the outlet is 2880mg/L, and the removal rate of COD is 71.2%.
Comparative example 2
Under the same background parameters, the urban domestic sewage is treated by ferroelectric chemistry and heterogeneous Fenton technology respectively. Under ferroelectric chemical treatment, the content of COD in the municipal domestic sewage detected by the outlet is 3870mg/L, and the removal rate of COD is 61.3%. Under the heterogeneous Fenton method treatment, the content of COD in the urban domestic sewage detected by the outlet is 3230mg/L, and the removal rate of COD is 67.7%.
Under the synergistic effect of floc adsorption and hydroxyl radical oxidation, the ferroelectric chemistry-heterogeneous Fenton coupling technology can effectively improve the sewage treatment effect.
Example 3
Treating urban domestic sewage with continuous ferroelectric chemical-heterogeneous Fenton water treatment technology, wherein the initial COD is 5000mg/L, the anode adopts iron electrode, the cathode adopts stainless steel, the retention time is 40min, the electrode voltage is 5V, and the electrode current density is 5mA/cm 2 . From the inlet to the outlet, three sections can be divided:
front section: adding hydrochloric acid to adjust pH to 5, adding oxygen to control the dissolved oxygen DO value of the solution to 9.8mg/L through an aeration device, wherein the aeration rate is 5L/min, adding ferrous sulfate, and the dosage is 15ppm; the conductivity was adjusted to 1500. Mu.s/cm and the anionic carbonate, sulfate and phosphate ion concentrations were 1000ppm;
middle section: adding hydrochloric acid and sodium hydroxide to adjust the pH to 7, and adding flocculant polyaluminium trichloride to the mixture at a dosage of 5ppm; adding hydrogen peroxide solution with the concentration of 40mg/L;
the rear section: adding hydrochloric acid and sodium hydroxide to adjust the pH to 7, wherein the dosage is 15mg/L; adding flocculant PAM, wherein the adding dosage is 7.5ppm;
the working parameters of the electromagnet are as follows: the moving speed of the electromagnet is 3m/min, and the working frequency is 15 times/min.
The content of COD in the urban domestic sewage detected at the outlet is 815mg/L, and the removal rate of COD is 83.7%.
Comparative example 3
Under the same background parameters, the urban domestic sewage is treated by ferroelectric chemistry and heterogeneous Fenton technology respectively. Under ferroelectric chemical treatment, the content of COD in the municipal domestic sewage detected by the outlet is 1800mg/L, and the removal rate of COD is 64%. Under the heterogeneous Fenton method treatment, the content of COD in the urban domestic sewage detected by the outlet is 1250mg/L, and the removal rate of COD is 75%.
Under the synergistic effect of floc adsorption and hydroxyl radical oxidation, the ferroelectric chemistry-heterogeneous Fenton coupling technology can effectively improve the sewage treatment effect.
Example 4
Treating sewage of chemical plant with continuous ferroelectric chemical-heterogeneous Fenton water treatment technology to obtain initial COD of 250mg/L, iron electrode as anode, carbon electrode as cathode, residence time of 30min, electrode voltage of 8V, and electrode current density of 7mA/cm 2 . From the inlet to the outlet, it can be divided into three sections, the front section: adding hydrochloric acid to adjust pH to 5, adding oxygen to control the dissolved oxygen DO value of the solution to 5.3mg/L through an aeration device, wherein the aeration rate is 8L/min, adding ferrous sulfate, and the dosage is 12ppm; the conductivity was adjusted to 1600. Mu.s/cm and the anionic carbonate, sulfate and phosphate ion concentrations were 880ppm;
middle section: adding hydrochloric acid to adjust pH to 6, adding flocculant polyaluminium trichloride to a dosage of 4.5ppm, adding hydrogen peroxide solution to a concentration of 35mg/L,
the rear section: adding hydrochloric acid and sodium hydroxide to adjust pH to 7, adding flocculant PAM at a dosage of 20mg/L, adding flocculant PAM at a dosage of 8ppm,
the working parameters of the electromagnet are as follows: the moving speed of the electromagnet is 2m/min, and the working frequency is 16 times/min.
The COD content of the sewage of the chemical plant is 57.5mg/L and the COD removal rate is 77% by detecting at the outlet.
Comparative example 4
Under the same background parameters, the chemical plant sewage is treated by ferroelectric chemistry and heterogeneous Fenton technology respectively. Under ferroelectric chemical treatment, the content of COD in the municipal domestic sewage detected by the outlet is 100mg/L, and the removal rate of COD is 60%. Under the heterogeneous Fenton method treatment, the content of COD in the urban domestic sewage detected by the outlet is 80mg/L, and the removal rate of COD is 68%.
Under the synergistic effect of floc adsorption and hydroxyl radical oxidation, the ferroelectric chemistry-heterogeneous Fenton coupling technology can effectively improve the sewage treatment effect.
Example 5
Treating sewage of chemical plant with continuous ferroelectric chemical-heterogeneous Fenton water treatment technology, wherein the initial COD is 450mg/L, the cathode and anode adopt iron electrodes, the retention time is 45min, the electrode voltage is 6.5V, and the electrode current density is 8mA/cm 2 . Can be divided into three sections from the inlet to the outlet
Front section: adding hydrochloric acid to adjust the pH value to 6, adding oxygen to control the dissolved oxygen DO value of the solution to 6.6mg/L through an aeration device, adding ferrous chloride at the aeration rate of 6.6L/min, and adding the dosage to be 16ppm; the conductivity was adjusted to 3000. Mu.s/cm and the anionic carbonate, sulfate and phosphate ion concentrations were 7800ppm;
middle section: adding hydrochloric acid to adjust pH to 6, adding flocculant polyaluminium trichloride to a dosage of 3.6ppm, adding hydrogen peroxide solution to a concentration of 38mg/L,
the rear section: adding hydrochloric acid and sodium hydroxide to adjust the pH to 7, wherein the dosage is 18mg/L; adding flocculant PAM with the dosage of 9.8ppm,
the working parameters of the electromagnet are as follows: the moving speed of the electromagnet is 3.4m/min, and the working frequency is 14 times/min.
The COD content of the sewage of the chemical plant is 67.2mg/L and the COD removal rate is 85.06% by detecting at the outlet.
Comparative example 5
Under the same background parameters, the chemical plant sewage is treated by ferroelectric chemistry and heterogeneous Fenton technology respectively. Under ferroelectric chemical treatment, the content of COD in the municipal domestic sewage detected by the outlet is 100.5mg/L, and the removal rate of COD is 77.67%. Under the heterogeneous Fenton method treatment, the content of COD in the urban domestic sewage detected by the outlet is 87.3mg/L, and the removal rate of COD is 80.6%.
Under the synergistic effect of floc adsorption and hydroxyl radical oxidation, the ferroelectric chemistry-heterogeneous Fenton coupling technology can effectively improve the sewage treatment effect.
Example 6
Treating sewage of certain chemical plant with continuous ferroelectric chemical-heterogeneous Fenton water treatment technology, with initial COD of 4500mg/L, iron electrode as anode, titanium electrode as cathode, residence time of 45min, electrode voltage of 6.5V, and electrode current density of 8mA/cm 2 . From the inlet to the outlet can be divided into three sections,
front section: adding hydrochloric acid to adjust the pH to 6; adding oxygen to control the DO value of the solution to be 6.6mg/L through an aeration device, wherein the aeration rate is 4.5L/min, adding ferrous sulfate, and the dosage is 18ppm; the conductivity was adjusted to 3000. Mu.s/cm and the anionic carbonate, sulfate and phosphate ion concentrations were 7800ppm;
middle section: adding hydrochloric acid to adjust the pH to 6; adding flocculant polyaluminium trichloride, wherein the dosage of the flocculant polyaluminium trichloride is 3.8ppm, and adding hydrogen peroxide solution with the concentration of 38 mg/L;
the rear section: adding hydrochloric acid and sodium hydroxide to adjust the pH to 7, wherein the dosage is 22mg/L; flocculant PAM, the dosage of the flocculant is 4.3ppm;
the working parameters of the electromagnet are as follows: the moving speed of the electromagnet is 3.4m/min, and the working frequency is 14 times/min.
The COD content of the sewage of the chemical plant is 710.4mg/L and the COD removal rate is 84.2% by detecting at the outlet.
Comparative example 6
Under the same background parameters, the chemical plant sewage is treated by ferroelectric chemistry and heterogeneous Fenton technology respectively. Under ferroelectric chemical treatment, the content of COD in the municipal domestic sewage detected by the outlet is 1000mg/L, and the removal rate of COD is 77.78%. Under the heterogeneous Fenton method treatment, the content of COD of the municipal domestic sewage detected by the outlet is 880.5mg/L, and the removal rate of COD is 80.43%.
Under the synergistic effect of floc adsorption and hydroxyl radical oxidation, the ferroelectric chemistry-heterogeneous Fenton coupling technology can effectively improve the sewage treatment effect.
Claims (7)
1. The application of a continuous ferroelectric chemical-heterogeneous Fenton water treatment device in sewage treatment is characterized in that a cathode and an anode are relatively fixed in the electrolytic tank, and the distance between the anode and the cathode is 1-30 cm; the channel in the electrolytic tank is divided into a front section, a middle section and a rear section by 2 baffles, wherein the front section is a region for accurately generating magnetic ferroferric oxide in situ, the middle section is a region for generating hydroxyl free radicals by heterogeneous Fenton, and the rear section is a region for adsorbing pollutants by the magnetic ferroferric oxide; the front section accounts for 35-45% of the total length of the channel in the electrolytic tank, an electromagnet is fixed on the outer surface of the bottom of the electrolytic tank corresponding to the front section, and the electromagnet is controlled to slide on the outer surface of the bottom of the electrolytic tank corresponding to the front section, the middle section and the rear section through an external power supply; wherein the moving speed of the electromagnet is 1-5 m/min, and the working frequency is 10-20 times/min; the application comprises the following steps: step 1, dividing a continuous water treatment device into a front section, a middle section and a rear section from an inlet to an outlet along the flowing direction of wastewater, wherein the front section is an electric flocculation magnetic ferroferric oxide production section, the middle section is a heterogeneous Fenton hydroxyl radical production section, and the rear section is a magnetic ferroferric oxide pollutant adsorption section; step 2, continuously introducing wastewater into the electrolytic tank, and respectively treating the front section, the middle section and the rear section when the wastewater passes through; wherein the front section is added with a salt ion reagent, the dosage is 5-20 ppm, the retention time of the wastewater is ensured to be 20-120 min, the electrode voltage is 3-10V, and the electrode current density is 0.5-10 mA/cm 2 Regulating pH to 3-6, introducing oxygen to control dissolved oxygen DO value to 1.8-9.6 mg/L, electrolyte anion concentration to 100-10000 ppm, conductivity to 500-5000 ㎲/cm; the pH value is regulated to be 6-7, the adding dosage of the flocculant is 1-15 ppm, and the adding dosage of the hydrogen peroxide solution is 30-50 mg/L; and in the later stage, the pH is regulated to 6-8, and the adding dosage of the flocculant is 3-12 ppm.
2. The use of a continuous ferroelectric chemical-heterogeneous Fenton water treatment device according to claim 1, wherein the anode is a ferroelectric electrode, the cathode is an iron electrode, stainless steel, carbon or titanium electrode, and the anode and the cathode are in the form of plates, porous or particles.
3. Use of a continuous ferroelectric chemical-heterogeneous Fenton water treatment device according to claim 1 for wastewater treatment, characterized in that: the sewage is urban domestic sewage or chemical plant sewage; and the COD content is 100-10000 mg/L.
4. Use of a continuous ferroelectric chemical-heterogeneous Fenton water treatment device according to claim 3 for wastewater treatment, characterized in that: when the wastewater is urban domestic wastewater, the pH value of the wastewater at the later stage needs to be adjusted to 7-8; when the wastewater is the wastewater of a chemical plant, the pH value of the wastewater at the later stage is required to be adjusted to be 6-7; the reagent used for regulating the pH is hydrochloric acid and sodium hydroxide, and the added dosage is 10-30 mg/L.
5. Use of a continuous ferroelectric chemical-heterogeneous Fenton water treatment device according to claim 1, wherein the flocculant is polyaluminium trichloride or PAM.
6. The use of a continuous ferroelectric chemical-heterogeneous Fenton water treatment device according to claim 1, wherein the aeration rate of oxygen introduced into the front stage is 0.1-10L/min.
7. The use of a continuous ferroelectric chemical-heterogeneous Fenton water treatment device according to claim 1, wherein said salt ion reagent is ferrous chloride or ferrous sulfate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011448040.4A CN112723489B (en) | 2020-12-09 | 2020-12-09 | Continuous ferroelectric chemical-heterogeneous Fenton water treatment device and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011448040.4A CN112723489B (en) | 2020-12-09 | 2020-12-09 | Continuous ferroelectric chemical-heterogeneous Fenton water treatment device and application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112723489A CN112723489A (en) | 2021-04-30 |
| CN112723489B true CN112723489B (en) | 2023-05-12 |
Family
ID=75599576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011448040.4A Active CN112723489B (en) | 2020-12-09 | 2020-12-09 | Continuous ferroelectric chemical-heterogeneous Fenton water treatment device and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112723489B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114790018B (en) * | 2022-03-08 | 2023-12-12 | 中材国际环境工程（北京）有限公司 | Electric flocculation device and method for treating wastewater by adopting same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103979646A (en) * | 2014-06-04 | 2014-08-13 | 江苏科技大学 | Continuous electric flocculation water treatment method for dosing along process |
| CN108558116A (en) * | 2018-06-26 | 2018-09-21 | 南京林业大学 | A kind of electric flocculation, magnetic flocculation and the integrated sewage disposal system of multi-stage oxidizing and method |
| CN108928892A (en) * | 2018-08-15 | 2018-12-04 | 清华大学 | A method of landfill leachate is handled based on electric Fenton coupling electric flocculation |
-
2020
- 2020-12-09 CN CN202011448040.4A patent/CN112723489B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103979646A (en) * | 2014-06-04 | 2014-08-13 | 江苏科技大学 | Continuous electric flocculation water treatment method for dosing along process |
| CN108558116A (en) * | 2018-06-26 | 2018-09-21 | 南京林业大学 | A kind of electric flocculation, magnetic flocculation and the integrated sewage disposal system of multi-stage oxidizing and method |
| CN108928892A (en) * | 2018-08-15 | 2018-12-04 | 清华大学 | A method of landfill leachate is handled based on electric Fenton coupling electric flocculation |
Non-Patent Citations (2)
| Title |
|---|
| A novel electro-coagulation-Fenton for energy efficient cyanobacteria and;Jingkun An等;《Journal of Hazardous Materials》;20190305;第650–658页 * |
| Utilization of iron sludge resulted from electro-coagulation;Mahmoud Samy等;《Water Practice & Technology》;20201009;第1228-1236页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112723489A (en) | 2021-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105967294B (en) | A kind of fluorine removal flocculation reaction method of fluoride waste | |
| CN100494098C (en) | Fenton and air-float integral water treating method | |
| CN102730862B (en) | Sewage treatment method in synthetic rubber production | |
| CN108238689B (en) | Method for treating polymer flooding sewage | |
| WO2002026639A1 (en) | Method and apparatus for clarification of water | |
| CN113307438A (en) | Treatment method of nickel-cobalt smelting heavy metal wastewater | |
| CN103739128B (en) | Pretreatment system and pretreatment method for high-concentration refractory organic wastewater | |
| CN112723489B (en) | Continuous ferroelectric chemical-heterogeneous Fenton water treatment device and application | |
| CN105502757A (en) | Industrial treatment method of high-concentration arsenic-containing wastewater | |
| CN110759578B (en) | Treatment method of coal chemical industry washing wastewater | |
| CN111320316A (en) | Landfill leachate membrane concentrated solution treatment method | |
| CN104787949A (en) | Method and device for treating refuse leachate through photoelectric Fenton oxidation reaction based on modified gas diffusion electrode | |
| CN108409003B (en) | Treatment method and system for salt-containing organic wastewater after PCB wastewater copper recovery | |
| CN109019999A (en) | A kind of processing method of the low concentration containing strong complexing nickel waste water | |
| CN111285491A (en) | Concentrated water treatment method and treatment device | |
| CN105692972A (en) | Industrial wastewater advanced treatment and cyclic utilization method | |
| CN111115919B (en) | Pretreatment method of pharmaceutical wastewater | |
| CN117023919A (en) | Multistage treatment system and multistage treatment process for gas field produced water | |
| CN103183449B (en) | Water reuse treatment process in sulfate pulping waste water | |
| CN111470671A (en) | Method for treating arsenic-containing organic wastewater | |
| CN114684979B (en) | Method and device for treating high-concentration refractory organic wastewater | |
| CN110606598A (en) | Method for treating low-concentration arsenic-containing organic industrial wastewater | |
| CN106630312B (en) | Treatment system, treatment method and application of coking phenol-cyanogen wastewater | |
| CN114149106A (en) | Method for treating high-salinity organic wastewater by coagulation-electrochemical catalytic oxidation | |
| CN114516689A (en) | Calcium carbide method polyvinyl chloride mercury-containing wastewater treatment and recycling method and application device thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |