CN110845058A - Sewage treatment method based on electrochemistry - Google Patents
Sewage treatment method based on electrochemistry 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F7/00—Aeration of stretches of water
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Abstract
The invention discloses an electrochemical-based sewage treatment method, which comprises the following steps: (a) decomposing and degrading organic matters in the sewage by using a photocatalytic sewage unit, and simultaneously measuring the concentration of heavy metal ions in the sewage; (b) setting the current density of the electrochemical sewage treatment unit when the electrochemical sewage treatment unit is electrified according to the concentration of the heavy metal ions detected in the step (a), and then replacing the heavy metal ions in the sewage by using a replacement mode; (c) carrying out aeration and air flotation treatment on the sewage treated in the step (b); (d) and (c) the water treated in the step (c) is connected into a clear water loop for recycling. The invention removes the organic pollutants in the water body by combining photocatalysis, aeration and air flotation, not only can improve the removal efficiency of the organic pollutants, but also can improve the removal speed of the organic pollutants, and simultaneously removes the heavy metal ions in the sewage by electrolysis, aeration and air flotation.
Description
Technical Field
The invention relates to the technical field of sewage treatment. In particular to a sewage treatment method based on electrochemistry.
Background
With the development of socioeconomic and the improvement of the living standard of people, more and more wastewater is generated by manufacturing enterprises, and the wastewater cannot be directly discharged, especially the wastewater generated by metal processing and manufacturing industries. Wastewater from metal processing manufacturing industry contains a large amount of heavy metal ions, which will not cause serious pollution to the natural environment and will cause serious harm to human and animals if discharged directly, for example, the water anode in japan water anode bay in 1956 is an embodiment of water anode having a large amount of methyl mercury. The wastewater generated in the production process of many metal processing enterprises contains not only heavy metal ions, but also a large amount of organic matters, and the heavy metal ions and the organic matters in the wastewater need to be treated by the wastewater treatment, so that the treated wastewater can be directly recycled or directly discharged. The existing sewage treatment method usually degrades organic matters in a mode of aeration or microbial fermentation, and heavy metal ions in the sewage are only removed in a mode of generating sediment and forming sludge, but some organic matters which cannot be degraded through simple aeration or microbial fermentation exist in the organic matters, so that a certain amount of organic pollutants still exist in the finally discharged water body, and the heavy metal ions in the sludge are likely to be converted into soluble salts under the action of acid radical ions in the soil and then pollute underground water along with the underground water or even an underground water system.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to provide an electrochemical-based sewage treatment method, which utilizes the combination of photocatalysis, aeration and air flotation to remove organic pollutants in a water body, thereby not only improving the removal efficiency of the organic pollutants, but also improving the removal speed of the organic pollutants, and simultaneously utilizes electrolysis, aeration and air flotation to remove heavy metal ions in the sewage, wherein most heavy metal ions in the sewage are removed by utilizing an electrolysis method, most heavy metal ions in the sewage are removed by utilizing aeration and air flotation, and the concentration of heavy metal ions in the discharged water body is further reduced.
In order to solve the technical problems, the invention provides the following technical scheme:
the sewage treatment method based on electrochemistry comprises the following steps:
(a) decomposing and degrading organic matters in the sewage by using a photocatalytic sewage unit, and simultaneously measuring the concentration of heavy metal ions in the sewage;
(b) setting the current density of the electrochemical sewage treatment unit when the electrochemical sewage treatment unit is electrified according to the concentration of the heavy metal ions detected in the step (a), and then replacing the heavy metal ions in the sewage by using a replacement mode;
(c) carrying out aeration and air flotation treatment on the sewage treated in the step (b);
(d) and (c) the water treated in the step (c) is connected into a clear water loop for recycling.
In the electrochemical-based sewage treatment method, in the step (a), before the photocatalytic sewage treatment unit is used for decomposing and degrading organic matters in the sewage, the sewage is filtered by the first filtering tank.
In the step (b), before the electrochemical sewage treatment unit is used for replacing and recovering heavy metal ions in the sewage, the sewage treated by the photocatalytic sewage treatment unit is settled in a first settling tank in a static flow manner.
In the electrochemical-based sewage treatment method, in the step (d), the water prepared in the step (c) is treated by the second sedimentation tank and the second filter tank in sequence.
According to the electrochemical-based sewage treatment method, the anode for electrochemical sewage treatment used by the electrochemical sewage treatment unit comprises an outer layer of a filter screen for an anode, an electrode substrate for the anode and a conductive wire binding post for the anode; the outer layer of the anode filter screen is sleeved on the anode electrode substrate, and a gap is formed between the inner wall of the outer layer of the anode filter screen and the outer wall of the anode electrode substrate; the aperture of the filter hole on the outer layer of the filter screen for the anode is 2-5 mm; the conductive wire binding post for the anode is arranged on the electrode substrate for the anode and is electrically connected with the positive electrode of the power supply.
According to the electrochemical-based sewage treatment method, the electrode substrate for the anode comprises a column core, a conductive tube and conductive clamping plates, one side of each conductive clamping plate is fixedly connected with the outer wall of the conductive tube, more than or equal to 2 conductive clamping plates are arranged on the outer wall of the conductive tube along the circumferential direction of the conductive tube, the conductive tube is sleeved on the column core and is tightly connected with the column core, and the column core is electrically connected with a power supply anode through the conductive wire binding post for the anode; the conductive clamping plate is made of a spiral conductive material; bonding has the magnetite strip on the electrically conductive splint lateral wall adjacent two on the same lateral wall of electrically conductive splint be equipped with the clearance between the magnetite strip, adsorb iron fillings on the magnetite strip.
In the electrochemical-based sewage treatment method, the cathode for electrochemical sewage treatment used by the electrochemical sewage treatment unit comprises a conductive binding post for a cathode, a filter screen outer layer for the cathode and an electrode substrate for the cathode; the outer layer of the filter screen for the cathode is sleeved on the electrode substrate for the cathode, and a gap is formed between the inner wall of the outer layer of the filter screen for the cathode and the outer wall of the electrode substrate for the cathode; the aperture of the filter hole on the outer layer of the filter screen for the cathode is 2-5 mm; the conductive wire binding post for the cathode is installed on the electrode substrate for the cathode and is electrically connected with the negative electrode of the power supply.
Above-mentioned sewage treatment method based on electrochemistry, on the exposed outer wall of conducting tube, on the exposed outer wall of electrically conductive splint and the three iron oxide strips are kept away from all be equipped with graphite alkene layer on the side of electrically conductive splint, be located three iron oxide strips are kept away from on the side of electrically conductive splint graphite alkene layer with be located graphite alkene layer on the exposed outer wall of conducting tube and/or be located graphite alkene layer electrically conductive connection on the exposed outer wall of electrically conductive splint.
According to the electrochemical-based sewage treatment method, the photocatalytic component used by the photocatalytic sewage treatment unit comprises an acid-resistant, alkali-resistant and oil-resistant carrier and photocatalyst particles, the photocatalyst particles are distributed on the acid-resistant, alkali-resistant and oil-resistant carrier, and the acid-resistant, alkali-resistant and oil-resistant carrier is a polytetrafluoroethylene film.
According to the electrochemical-based sewage treatment method, the photocatalyst particles consist of the following components: 20-50 parts of titanium dioxide, 1-5 parts of zinc oxide and 0.1-0.3 part of platinum.
The sewage treatment apparatus used in the present invention comprises:
the first filter is used for filtering sundries with larger volume in the sewage;
the first pH value adjusting tank is used for adjusting the pH value of the sewage;
the photocatalytic sewage treatment unit is used for decomposing and degrading organic matters in sewage;
the first sedimentation tank is used for precipitating and filtering suspended matters in the sewage;
the second pH value adjusting tank is used for adjusting the pH value of the sewage treated by the photocatalysis sewage;
the electrochemical sewage treatment unit is used for treating heavy metal ions in the sewage;
the aeration tank is used for treating residual organic matters and heavy metal ions in the sewage;
the air floatation tank is used for treating solid granules in the sewage;
the second sedimentation tank is used for precipitating and filtering suspended matters in the treated sewage;
the second filter is used for filtering sundries which are not subjected to sedimentation treatment in the treated sewage;
the water outlet end of the sewage pump is in fluid conduction connection with the water inlet end of the first filter tank, the water outlet end of the first filter tank is in fluid conduction connection with the water inlet end of the first pH value adjusting tank, the water outlet end of the first pH value adjusting tank is in fluid conduction connection with the water inlet end of the photocatalytic sewage treatment unit, the water outlet end of the photocatalytic sewage treatment unit is in fluid conduction connection with the water inlet end of the first sedimentation tank, the water outlet end of the first sedimentation tank is in fluid conduction connection with the water inlet end of the second pH value adjusting tank, the water outlet end of the second pH value adjusting tank is in fluid conduction connection with the water inlet end of the electrochemical sewage treatment unit, the water outlet end of the electrochemical sewage treatment unit is in fluid conduction connection with the water inlet end of the aeration tank and the water inlet end of the photocatalytic sewage treatment unit respectively, the water outlet end of the aeration tank is in fluid conduction connection with the water inlet end of the air flotation tank, and the water outlet end of the air, the water outlet end of the second sedimentation tank is in fluid conduction connection with the water inlet end of the second filter tank, and the water outlet end of the second filter tank is in fluid conduction connection with the water inlet end of the clear water discharge pipe; and the water inlet end and the water outlet end of the electrochemical sewage treatment unit are respectively provided with an ion sensor for measuring the concentration of heavy metal ions in sewage, and the ion sensors are in communication connection with the console.
The technical scheme of the invention achieves the following beneficial technical effects:
1. the invention uses the photocatalysis sewage treatment unit, the aeration tank and the air flotation tank to degrade and remove organic pollutants in the sewage, uses the photocatalysis sewage treatment unit to degrade the organic pollutants, directly decomposes easily degradable organic pollutants into carbon dioxide and water, decomposes difficultly degradable organic pollutants into easily degradable organic pollutants or carbon dioxide and water, and then further removes the residual organic pollutants in the sewage by the aeration tank and the air flotation tank, thereby further reducing the amount of the organic pollutants contained in the discharged water body.
2. The invention utilizes an electrochemical sewage treatment unit, an aeration tank and an air floatation tank to remove heavy metal ions in sewage, wherein the electrochemical sewage treatment unit recycles most heavy metal ions in the sewage in an electrolysis or replacement mode, and sludge or other sediments in the aeration tank and the air floatation tank are utilized to adsorb and precipitate the heavy metal ions, thereby further reducing the heavy metal ions in the discharged water body.
Drawings
FIG. 1 is a schematic view of a process for treating wastewater according to the present invention;
FIG. 2 is a schematic structural view of a cathode for electrochemical wastewater treatment according to the present invention;
FIG. 3 is a schematic view showing the structure of an anode for electrochemical sewage treatment in the present invention;
FIG. 4 is a schematic view showing the structure of an electrode base for an anode in the present invention;
FIG. 5 is a schematic perspective view of the conductive tube and the conductive clip in the electrode substrate for an anode according to the present invention.
The reference numbers in the figures denote: 1-outer layer of filter screen for cathode; 2-an electrode base for a cathode; 3-conductive wire binding post for cathode; 4-outer layer of filter screen for anode; 5-an electrode base for anode; 6-conductive wire binding post for anode; 7-column core; 8-a conductive tube; 9-a conductive splint; 10-ferric oxide strip; 11-iron filings.
Detailed Description
The invention relates to an electrochemical-based sewage treatment method, which comprises the following steps:
(a) decomposing and degrading organic matters in the sewage by using a photocatalytic sewage unit, and simultaneously measuring the concentration of heavy metal ions in the sewage; before the photocatalytic sewage treatment unit is used for decomposing and degrading organic matters in sewage, filtering the sewage by a first filtering tank;
(b) setting the current density of the electrochemical sewage treatment unit when the electrochemical sewage treatment unit is electrified according to the concentration of the heavy metal ions detected in the step (a), and then replacing the heavy metal ions in the sewage by using a replacement mode; before the electrochemical sewage treatment unit is used for replacing and recovering heavy metal ions in sewage, the sewage treated by the photocatalytic sewage treatment unit is statically settled in a first settling tank;
(c) carrying out aeration and air flotation treatment on the sewage treated in the step (b);
(d) treating the water prepared in the step (c) by a second sedimentation tank and a second filter tank in sequence, and then recycling the treated water in a clean water loop.
As shown in figure 1, the sewage treatment device used in the invention comprises a first filter tank for filtering sundries with larger volume in sewage, a first pH value adjusting tank for adjusting the pH value of the sewage, a photocatalytic sewage treatment unit for decomposing and degrading organic matters in the sewage, a first sedimentation tank for precipitating and filtering suspended matters in the sewage, a second pH value adjusting tank for adjusting the pH value of the sewage treated by the photocatalytic sewage treatment, the device comprises an electrochemical sewage treatment unit for treating heavy metal ions in sewage, an aeration tank for treating residual organic matters and heavy metal ions in sewage, an air floatation tank for treating solid granules in sewage, a second sedimentation tank for precipitating and filtering suspended matters in the treated sewage and a second filter tank for filtering impurities which are not subjected to sedimentation treatment in the treated sewage; the water outlet end of the sewage pump is in fluid conduction connection with the water inlet end of the first filter tank, the water outlet end of the first filter tank is in fluid conduction connection with the water inlet end of the first pH value adjusting tank, the water outlet end of the first pH value adjusting tank is in fluid conduction connection with the water inlet end of the photocatalytic sewage treatment unit, the water outlet end of the photocatalytic sewage treatment unit is in fluid conduction connection with the water inlet end of the first sedimentation tank, the water outlet end of the first sedimentation tank is in fluid conduction connection with the water inlet end of the second pH value adjusting tank, the water outlet end of the second pH value adjusting tank is in fluid conduction connection with the water inlet end of the electrochemical sewage treatment unit, the water outlet end of the electrochemical sewage treatment unit is in fluid conduction connection with the water inlet end of the aeration tank and the water inlet end of the photocatalytic sewage treatment unit respectively, the water outlet end of the aeration tank is in fluid conduction connection with the water inlet end of the air flotation tank, and the water outlet end of the air, the water outlet end of the second sedimentation tank is in fluid conduction connection with the water inlet end of the second filter tank, and the water outlet end of the second filter tank is in fluid conduction connection with the water inlet end of the clear water discharge pipe; the electrochemical sewage treatment unit is provided with an ion sensor which is used for measuring the concentration of heavy metal ions in sewage and is in communication connection with the console on the water inlet end and the water outlet end respectively, and the second pH value adjusting tank is provided with an ion sensor which is in communication connection with the console on the water inlet end. The ion sensors positioned on the water inlet end and the water outlet end of the electrochemical sewage treatment unit monitor the concentration change of heavy metal ions in the sewage flowing in and out of the electrochemical sewage treatment unit, and the change of the concentration of the heavy metal ions in the sewage flowing in and out of the electrochemical sewage treatment unit is known in time through the control console so as to adjust the voltage loaded at two ends of the anode and the cathode in the electrochemical sewage treatment unit and the current density between the anode and the cathode. And the ion sensor arranged on the water inlet end of the second pH value adjusting tank and the ion sensor arranged on the water inlet end of the electrochemical sewage treatment unit are used for monitoring the change of the concentration of heavy metal ions in the sewage after the second pH value adjustment so as to provide data reference for adjusting the medicine used for the second pH value adjustment.
Wherein, as shown in fig. 3-5, the anode for electrochemical sewage treatment used by the electrochemical sewage treatment unit comprises a filter screen outer layer 4 for anode, an electrode base body 5 for anode and a conductive wire binding post 6 for anode; the anode filter screen outer layer 4 is sleeved on the anode electrode substrate 5, and a gap is formed between the inner wall of the anode filter screen outer layer 4 and the outer wall of the anode electrode substrate 5; the aperture of the filter hole of the outer layer 4 of the filter screen for the anode is 3 mm; the conductive wire binding post 6 for the anode is arranged on the electrode substrate 5 for the anode and is electrically connected with the positive electrode of the power supply; the anode electrode substrate 5 comprises a column core 7, a conductive tube and conductive clamping plates 9, wherein one side of each conductive clamping plate 9 is fixedly connected with the outer wall of the conductive tube, 10 conductive clamping plates 9 are arranged on the outer wall of the conductive tube along the circumferential direction of the conductive tube, the conductive tube is sleeved on the column core 7 and is tightly connected with the column core 7, and the column core 7 is electrically connected with a power supply anode through the anode conductive wire binding post 6; the conductive clamping plate 9 is made of a spiral conductive material; iron oxide strips 10 are bonded on the side wall of the conductive clamping plate 9, a gap is formed between every two adjacent iron oxide strips 10 on the same side wall of the conductive clamping plate 9, and scrap iron 11 is adsorbed on the iron oxide strips 10; graphene layers are arranged on the exposed outer wall of the conductive tube, the exposed outer wall of the conductive clamping plate 9 and the side face, away from the conductive clamping plate 9, of the three-iron tetroxide strip 10, and the graphene layers on the side face, away from the conductive clamping plate 9, of the three-iron tetroxide strip 10 are respectively in conductive connection with the graphene layers on the exposed outer wall of the conductive tube and the graphene layers on the exposed outer wall of the conductive clamping plate 9; as shown in fig. 2, the cathode for electrochemical sewage treatment used in the electrochemical sewage treatment unit includes a conductive binding post for cathode, a screen outer layer 1 for cathode, and an electrode base body 2 for cathode; the cathode filter screen outer layer 1 is sleeved on the cathode electrode substrate 2, and a gap is formed between the inner wall of the cathode filter screen outer layer 1 and the outer wall of the cathode electrode substrate 2; the aperture of the filter hole of the outer layer 1 of the filter screen for the cathode is 3 mm; the cathode conductive wire terminal 3 is mounted on the cathode electrode base 2 and electrically connected to a negative power supply.
In order to avoid the situation that the anode electrode base body 5 or/and the cathode electrode base body 2 are damaged to cause the shutdown of the device, in this embodiment, four anode electrode base bodies 5 are arranged in the anode filter screen outer layer 4, four cathode electrode base bodies 2 are arranged in the cathode filter screen outer layer 1, so that the shutdown of the device caused by the failure of any one of the anode electrode base bodies 5 or four cathode electrode base bodies 2 is not afraid of.
In this embodiment, the photocatalytic component used by the photocatalytic sewage treatment unit includes an acid-resistant, alkali-resistant, and oil-resistant carrier and photocatalyst particles, the photocatalyst particles are distributed on the acid-resistant, alkali-resistant, and oil-resistant carrier, the acid-resistant, alkali-resistant, and oil-resistant carrier is a polytetrafluoroethylene film, and the photocatalyst particles are composed of the following components: 35 parts by weight of titanium dioxide, 4 parts by weight of zinc oxide and 0.25 part by weight of platinum.
According to the invention, the photocatalytic sewage treatment unit is used for degrading organic matters in sewage to degrade the organic matters into carbon dioxide and water or organic matters with smaller molecules, and then the electrochemical sewage treatment unit is used for carrying out oxidative degradation on the untreated organic matters or the organic matters degraded into smaller molecules, so that the organic matters in sewage can be removed to the maximum extent, meanwhile, the sewage can be removed to a great extent without staying in the photocatalytic sewage treatment unit for a long time, the sewage treatment speed is relatively improved, and the treatment pressure of the aeration tank and the air floatation tank can be reduced. And the electrochemical sewage treatment unit is used for removing heavy metal ions contained in the sewage, and the aeration tank is used for effectively supplementing the heavy metal ions removed by the electrochemical sewage treatment unit, so that the heavy metal ions in the sewage can be removed to a greater extent.
The invention is used for treating the sewage to be treated containing emulsified oil which is produced in the production of certain metal product processing enterprises, and the sewage before treatment and the reuse water obtained after treatment are handed over to a third-party detection mechanism for detection.
The sewage to be treated is detected by a third party detection mechanism, the COD content in the sewage to be treated is 11600mg/L, the pH value is 5.5-6.2, the Cu content is 16.72mg/L, and the chromium content is 25.36 mg/L.
Pumping sewage into the first filter tank by a sewage pump, filtering metal fragments with larger particle sizes in the sewage, then enabling the sewage to flow into the first pH value adjusting tank, automatically adding medicine by an automatic medicine adding device to adjust the pH value of the sewage to 6.5-7.3, enabling the sewage to flow into the photocatalytic sewage treatment unit to carry out photocatalytic degradation on organic matters in the sewage, then discharging the treated sewage into the first settling tank to settle suspended matters and particles in the sewage, discharging the settled sewage into the second pH value adjusting tank to adjust the pH value of the sewage, adjusting the pH value of the sewage in the second pH value adjusting tank to 7.0-7.5, discharging the sewage with the pH value adjusted to 7.0-7.5 into the electrochemical sewage treatment unit to be treated, and degrading heavy metal ions and residual organic matters in the sewage by using the electrochemical sewage treatment unit, then the treated sewage is treated by the aeration tank, the air floatation tank, the second sedimentation tank and the second filter tank respectively. Wherein the illumination intensity of the photocatalytic sewage treatment unit is 184mW/cm2The current density in the electrochemical sewage treatment unit is 7.6mA/cm2. When the concentration of the heavy metal ions detected by the ion sensor at the water outlet end of the electrochemical sewage treatment unit is less than or equal to the sewage discharge standard, the aeration of the aeration tank and the blowing of air or oxygen into the air flotation tank can be stopped.
And detecting the treated reuse water by a third-party detection mechanism, wherein the COD content, the pH value, the Cu content and the chromium content in the treated reuse water are respectively 62mg/L, 7.1-7.2, 0.008mg/L and 0.01 mg/L.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (10)
1. The sewage treatment method based on electrochemistry is characterized by comprising the following steps:
(a) decomposing and degrading organic matters in the sewage by using a photocatalytic sewage unit, and simultaneously measuring the concentration of heavy metal ions in the sewage;
(b) setting the current density of the electrochemical sewage treatment unit when the electrochemical sewage treatment unit is electrified according to the concentration of the heavy metal ions detected in the step (a), and then replacing the heavy metal ions in the sewage by using a replacement mode;
(c) carrying out aeration and air flotation treatment on the sewage treated in the step (b);
(d) and (c) the water treated in the step (c) is connected into a clear water loop for recycling.
2. The electrochemical-based sewage treatment method of claim 1, wherein in the step (a), the sewage is filtered through a first filtering tank before the photocatalytic sewage treatment unit decomposes and degrades organic substances in the sewage.
3. The electrochemical-based sewage treatment method of claim 1, wherein in the step (b), before the electrochemical sewage treatment unit is used for replacing and recovering heavy metal ions in the sewage, the sewage treated by the photocatalytic sewage treatment unit is subjected to static flow sedimentation in a first sedimentation tank.
4. The electrochemical-based wastewater treatment method according to claim 1, wherein in step (d), the water obtained in step (c) is treated by a second sedimentation tank and a second filter tank in sequence.
5. The electrochemical-based sewage treatment method according to any one of claims 1 to 4, wherein the anode for electrochemical sewage treatment used in the electrochemical sewage treatment unit comprises an anode screen outer layer (4), an anode electrode base body (5) and an anode conductive wire binding post (6); the anode filter screen outer layer (4) is sleeved on the anode electrode substrate (5), and a gap is formed between the inner wall of the anode filter screen outer layer (4) and the outer wall of the anode electrode substrate (5); the aperture of the filter hole of the outer layer (4) of the filter screen for the anode is 2-5 mm; the conductive wire binding post (6) for the anode is arranged on the electrode base body (5) for the anode and is electrically connected with the positive electrode of the power supply.
6. The electrochemical-based sewage treatment method according to claim 5, wherein the anode electrode substrate (5) comprises a core (7), a conductive tube and conductive clamping plates (9), one side of each conductive clamping plate (9) is fixedly connected with the outer wall of the conductive tube, 2 or more conductive clamping plates (9) are arranged on the outer wall of the conductive tube along the circumferential direction of the conductive tube, the conductive tube is sleeved on the core (7) and is tightly connected with the core (7), and the core (7) is electrically connected with a positive power supply electrode through the anode conductive wire binding post (6); the conductive clamping plate (9) is made of a spiral conductive material; electrically conductive splint (9) are last to bond has magnetite strip (10) electrically conductive splint (9) are with adjacent two on the same lateral wall be equipped with the clearance between magnetite strip (10), adsorb iron fillings (11) on magnetite strip (10).
7. The electrochemical-based wastewater treatment method according to claim 6, wherein the cathode for electrochemical wastewater treatment used in the electrochemical wastewater treatment unit comprises a conductive binding post for cathode, a screen outer layer (1) for cathode, and an electrode base body (2) for cathode; the cathode filter screen outer layer (1) is sleeved on the cathode electrode substrate (2) and a gap is formed between the inner wall of the cathode filter screen outer layer (1) and the outer wall of the cathode electrode substrate (2); the aperture of the filter hole of the outer layer (1) of the filter screen for the cathode is 2-5 mm; the conductive wire binding post (3) for the cathode is arranged on the electrode base body (2) for the cathode and is electrically connected with the negative electrode of the power supply.
8. The electrochemical-based sewage treatment method according to claim 7, wherein graphene layers are disposed on the exposed outer wall of the conductive pipe, the exposed outer wall of the conductive clamping plate (9) and the side of the tri-iron tetroxide strip (10) away from the conductive clamping plate (9), and the graphene layer on the side of the tri-iron tetroxide strip (10) away from the conductive clamping plate (9) is in conductive connection with the graphene layer on the exposed outer wall of the conductive pipe and/or the graphene layer on the exposed outer wall of the conductive clamping plate (9).
9. The electrochemical-based sewage treatment method according to any one of claims 1 to 4, wherein the photocatalytic member used in the photocatalytic sewage treatment unit comprises an acid, alkali and oil resistant carrier and photocatalyst particles, the photocatalyst particles are distributed on the acid, alkali and oil resistant carrier, and the acid, alkali and oil resistant carrier is a polytetrafluoroethylene film.
10. The electrochemical-based wastewater treatment method of claim 9, wherein the photocatalyst particles are composed of: 20-50 parts of titanium dioxide, 1-5 parts of zinc oxide and 0.1-0.3 part of platinum.
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| CN201911276416.5A CN110845058B (en) | 2019-12-12 | 2019-12-12 | Sewage treatment method based on electrochemistry |
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| CN201911276416.5A CN110845058B (en) | 2019-12-12 | 2019-12-12 | Sewage treatment method based on electrochemistry |
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| JP2007245047A (en) * | 2006-03-17 | 2007-09-27 | Nissan Motor Co Ltd | Wastwater treatment system |
| CN103055873A (en) * | 2013-01-04 | 2013-04-24 | 华东理工大学 | Composite photocatalyst membrane material with hierarchical pore structure and preparation method thereof |
| DE202015104077U1 (en) * | 2015-08-04 | 2015-08-25 | Kuan Ming Chen | Water Moss Remover |
| CN105152422A (en) * | 2015-09-15 | 2015-12-16 | 赵洪贵 | System for treating heavy metal wastewater by electrochemical-microflocculation-floatation process |
| CN108358356A (en) * | 2018-02-21 | 2018-08-03 | 苏州永涛环保科技有限公司 | A method of it recycling copper from cupric brown oxide waste liquid and recycles sulfuric acid |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007245047A (en) * | 2006-03-17 | 2007-09-27 | Nissan Motor Co Ltd | Wastwater treatment system |
| CN103055873A (en) * | 2013-01-04 | 2013-04-24 | 华东理工大学 | Composite photocatalyst membrane material with hierarchical pore structure and preparation method thereof |
| DE202015104077U1 (en) * | 2015-08-04 | 2015-08-25 | Kuan Ming Chen | Water Moss Remover |
| CN105152422A (en) * | 2015-09-15 | 2015-12-16 | 赵洪贵 | System for treating heavy metal wastewater by electrochemical-microflocculation-floatation process |
| CN108358356A (en) * | 2018-02-21 | 2018-08-03 | 苏州永涛环保科技有限公司 | A method of it recycling copper from cupric brown oxide waste liquid and recycles sulfuric acid |
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