CN116495844A - Electric catalysis Fenton-like device and method for treating hospital sewage - Google Patents
Electric catalysis Fenton-like device and method for treating hospital sewage Download PDFInfo
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- CN116495844A CN116495844A CN202310684600.3A CN202310684600A CN116495844A CN 116495844 A CN116495844 A CN 116495844A CN 202310684600 A CN202310684600 A CN 202310684600A CN 116495844 A CN116495844 A CN 116495844A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000010865 sewage Substances 0.000 title claims abstract description 18
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- 238000007254 oxidation reaction Methods 0.000 claims abstract description 38
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 229910052799 carbon Inorganic materials 0.000 claims description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 11
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 239000003814 drug Substances 0.000 claims description 7
- 239000007772 electrode material Substances 0.000 claims description 7
- 239000013043 chemical agent Substances 0.000 claims description 6
- -1 ruthenium dioxide-iridium dioxide Chemical compound 0.000 claims description 6
- 244000052616 bacterial pathogen Species 0.000 claims description 5
- 230000005684 electric field Effects 0.000 claims description 5
- 229910052697 platinum Inorganic materials 0.000 claims description 5
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 239000013543 active substance Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 2
- 239000006228 supernatant Substances 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 12
- LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 description 12
- 229960005404 sulfamethoxazole Drugs 0.000 description 12
- JLKIGFTWXXRPMT-UHFFFAOYSA-N sulphamethoxazole Chemical compound O1C(C)=CC(NS(=O)(=O)C=2C=CC(N)=CC=2)=N1 JLKIGFTWXXRPMT-UHFFFAOYSA-N 0.000 description 12
- 238000001179 sorption measurement Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 150000001450 anions Chemical class 0.000 description 4
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 4
- 230000003115 biocidal effect Effects 0.000 description 4
- FFGPTBGBLSHEPO-UHFFFAOYSA-N carbamazepine Chemical compound C1=CC2=CC=CC=C2N(C(=O)N)C2=CC=CC=C21 FFGPTBGBLSHEPO-UHFFFAOYSA-N 0.000 description 4
- 229960000623 carbamazepine Drugs 0.000 description 4
- 229960000282 metronidazole Drugs 0.000 description 4
- VAOCPAMSLUNLGC-UHFFFAOYSA-N metronidazole Chemical compound CC1=NC=C([N+]([O-])=O)N1CCO VAOCPAMSLUNLGC-UHFFFAOYSA-N 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 229940079593 drug Drugs 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000005711 Benzoic acid Substances 0.000 description 2
- 241000588724 Escherichia coli Species 0.000 description 2
- MXWJVTOOROXGIU-UHFFFAOYSA-N atrazine Chemical compound CCNC1=NC(Cl)=NC(NC(C)C)=N1 MXWJVTOOROXGIU-UHFFFAOYSA-N 0.000 description 2
- 235000010233 benzoic acid Nutrition 0.000 description 2
- 108010066114 cabin-2 Proteins 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- WKPSFPXMYGFAQW-UHFFFAOYSA-N iron;hydrate Chemical compound O.[Fe] WKPSFPXMYGFAQW-UHFFFAOYSA-N 0.000 description 2
- 238000010525 oxidative degradation reaction Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
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- 230000035484 reaction time Effects 0.000 description 2
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- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229940123317 Sulfonamide antibiotic Drugs 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 229940088710 antibiotic agent Drugs 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
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- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
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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
- C02F1/467—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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
Abstract
The invention provides an electro-catalysis Fenton-like device for treating hospital sewage and a method thereof, comprising an electro-catalysis oxidation device, wherein the electro-catalysis oxidation device is provided with a water inlet end and a water outlet end, the water inlet end is communicated with a first pH regulating tank, and the water outlet end is communicated with a second pH regulating tank; after physical filtration, hospital wastewater firstly enters a first pH regulating tank, sulfuric acid is added until pH=3 to reach the reaction condition of the electrocatalytic oxidation technology, the wastewater enters an electrocatalytic oxidation device, a catalyst and an oxidant are added, the wastewater after degradation flows into a second pH regulating tank, naOH is added into the regulating tank to regulate the water body to a neutral condition, and finally the wastewater flows into a sedimentation tank to carry out solid-liquid separation. The sewage treatment equipment has the advantages of small occupied area, simple structure and convenient operation, and can realize in-situ treatment of wastewater near a hospital and reduce transportation risk and cost for treating the wastewater in the hospital.
Description
Technical Field
The invention belongs to the field of sewage treatment, and in particular relates to an electric catalysis Fenton-like device and method for treating hospital sewage.
Background
With the development of human society, environmental water resource pollution caused by artificial sewage discharge generated by industrial production, agricultural breeding industry application and town construction is increasingly serious in recent decades, and more importance is drawn. Among them, hospital wastewater has attracted attention as one of main urban domestic wastewater. The pollution producing link of the hospital mainly comes from domestic sewage produced by administrative departments of the hospital such as offices and canteens, medical wastewater produced by medical departments such as outpatient departments, operating rooms, clinical laboratory, CT rooms and the like. The discharge characteristics of hospital wastewater are the complexity and uncertainty of pollutants in water and the imbalance of water quality and water quantity. For the control of hospital wastewater, the national emphasis is placed, and the national environmental protection agency and the quality supervision and inspection and quarantine administration issue "medical institution water pollution emission Standard" (GB 1866-2005) for comprehensively controlling the emission of medical wastewater in 7 months of 2005. Antibiotics are a common class of PPCPs, commonly found in hospital wastewater and other aqueous media. Sulfamethoxazole (SMX) is widely used as an important sulfonamide antibiotic in the field of hospitals, and occupies 5% of the total antibiotic consumption in China. Accumulation of large amounts of SMX in the environment will lead to the development of drug-resistant bacteria and genes in the environment, thus affecting the healthy life of people.
At present, common sewage treatment methods for hospital wastewater can be divided into two types: physical and chemical methods, such as ozone treatment techniques, chlorine disinfection techniques, ultraviolet sterilization techniques, and the like. The traditional technology has the advantages of complex device, high operation condition requirement, high operation cost, low efficiency and easy secondary pollution to the water body, so that a set of water treatment process with environment friendliness, low cost and high efficiency is urgently needed to face the growing medical wastewater.
Disclosure of Invention
Aiming at the technical problems, the invention establishes a set of sewage treatment equipment which has small occupied area, simple structure and convenient operation, can realize the in-situ treatment of wastewater near a hospital, and reduces the transportation risk and cost of treating the wastewater in the hospital. The hospital wastewater contains various antibiotic pollutants and various harmful pathogens, and aiming at the special characteristics of the hospital wastewater water quality, the invention is based on EC/Fe 3+ The oxidation system establishes a set of electrocatalytic oxidation treatment system to synchronously eliminate pollutants and sterilize the hospital wastewater, so as to meet the emission requirement of medical wastewater. The method provided by the invention can be used for recycling the catalyst in the system by the traditional chemical means, so that the influence of catalyst loss on the environment is reduced. The invention converts the light energy into the electric energy by the solar panel to supply power to the electrocatalytic oxidation device, thereby improving the utilization efficiency of the process device to external resources.
The specific technical scheme is as follows:
an electro-catalysis Fenton-like device for treating hospital sewage comprises an electro-catalysis oxidation device, wherein the electro-catalysis oxidation device is provided with a water inlet end and a water outlet end, the water inlet end is communicated with a first pH regulating tank, and the water outlet end is communicated with a second pH regulating tank;
the electrocatalytic oxidation device comprises: a chamber lid, an electrode portion, and a reaction chamber portion; the cabin cover is provided with a chemical agent feeding port which is communicated with chemical agent feeding equipment;
two pairs of electrodes are arranged in the electrocatalytic oxidation device, namely a carbon felt electrode and a DSA electrode, wherein the carbon felt electrode is a cathode, and the DSA electrode is an anode; the surface of the DSA electrode taking iron as a carrier is provided with a ruthenium dioxide-iridium dioxide coating; the carbon felt electrode is fixed by an electrode clamping plate, and the DSA electrode is fixed by a copper plate groove in the reaction cabin; the power supply is respectively connected with the cathode and the anode through a fixed wire on the connecting electrode clamping plate and a fixed wire on the copper plate groove, so that the electrode material is electrified;
the reaction chamber is divided into two areas by a partition plate: a water inlet compartment and an electric field compartment.
The electrode clamping plate comprises two acrylic plates which are connected through a rotating shaft, so that the acrylic plates can rotate and be fixed; the lower surfaces of the two acrylic plates are hollow, and the hollow inner wall is covered with a platinum sheet which is connected with the fixed lead.
The invention uses EC/Fe 3+ The method for establishing the hospital wastewater treatment process by taking the oxidation system as a core technology comprises the following specific steps:
after physical filtration, hospital wastewater firstly enters a first pH regulating tank, the regulating tank can stabilize the water inflow of the wastewater, and sulfuric acid is added until the pH=3 to reach the reaction condition of the electrocatalytic oxidation technology. After the acidic condition is reached, the wastewater enters an electrocatalytic oxidation device. Catalyst (Fe) is added into the equipment by a medicament adding device 2 (SO 4 ) 3 ) And an oxidizing agent (PMS, PDS, H) 2 O 2 ) Two pairs of electrodes are arranged in the electrocatalytic oxidation device, the carbon felt electrode is used as a cathode, the DSA electrode (dimensionally stable anode) is used as an anode, the solar panel is used for converting light energy into electric energy, and the storage battery pack is used for storing the electric energy and supplying power to equipment, so that the electrocatalytic oxidation reaction is started. The various active substances with high oxidability generated in the reaction oxidize and degrade pollutants and pathogenic bacteria in the water body in the flowing process of the wastewater. And (3) the wastewater after degradation flows into a second pH regulating tank, naOH is added into the regulating tank to regulate the water body to a neutral condition, the water body finally flows into a sedimentation tank to carry out solid-liquid separation, supernatant flows out through an overflow weir, and sediment is collected through sedimentation to carry out resource utilization.
In the first pH adjusting tank, H was added 2 SO 4 The pH value of the water body is reduced to be acidic, thus ensuring that the added catalyst Fe 2+ Can exist in the form of ions, which is favorable for Fe 3+ /Fe 2+ Circulation in water; secondly with the addition of sulfuric acid, SO 4 2- The content in the system is gradually increased, so that the conductivity in the wastewater quality can be increased, and the normal operation of the subsequent electrocatalytic oxidation device is facilitated; finally, the acidity of the water quality is improved, and the water quality can be inhibitedAnd part of pathogenic bacteria grow in the water, so that the number of pathogens is reduced.
The PMS added into the electrocatalytic oxidation device has certain oxidizing property and can produce oxidation elimination effect on pollutants and pathogenic bacteria in water. The catalyst and oxidant are first thoroughly mixed in the internal water inlet compartment (300) of the apparatus (the construction of the apparatus will be described in detail below) and then flow into the electric field compartment (400). The cathode carbon felt material in the equipment has a very high specific surface area, so that the cathode carbon felt material has a relatively strong physical adsorption effect on pollutants in a system, and the adsorption effect is beneficial to the adsorption and removal of the pollutants on one hand and the contact of the oxidation active substances generated on the surface of the electrode in situ with the organic pollutants on the other hand, so that the degradation of the organic pollutants is promoted. The electrode materials in the electrocatalytic oxidation device are all detachable and assembled and can be detached and replaced after being used for a period of time, and the electrode materials are all commercial electrodes common in the market, so that the electrocatalytic oxidation device has the characteristics of low cost, easiness in obtaining, small environmental pollution and the like. The power supply equipment is composed of a solar panel, a voltage regulator and a storage battery pack, the solar panel converts light energy into electric energy for storage, the environment-friendly characteristic of the equipment is reflected, and the voltage regulator device is added to stably convey the electric energy to the storage battery pack due to poor stability of the electric energy voltage converted by the solar panel, so that the loss of the equipment is reduced, and the energy storage efficiency of the electric energy is increased.
The second pH adjusting tank has the main function of removing the catalyst existing in the system, and converting Fe ions into hydroxide precipitates through the introduction of hydroxide ions to realize solid-liquid separation (as shown in equations (6) - (9)). Secondly, the pH value of the water body is regulated to be neutral to meet the discharge standard (pH=6-9) of the hospital wastewater, and the further treatment of other subsequent processes on the discharged water body is facilitated. The iron oxide precipitate is collected and recovered through the sedimentation tank, and the iron oxide precipitate has a good flocculation effect as colloid, so that the collected precipitate colloid can be used for flocculating agents in other neighborhoods after a series of pretreatment, the influence of the catalyst on the environment can be reduced, and the recycling utilization of the catalyst is improved.
Fe 2+ +H 2 O→FeOH + +H + (6)
Fe 3+ +H 2 O→FeOH 2+ +H + (7)
Fe 2+ +2H 2 O→Fe(OH) 2 + +2H + (8)
Fe 3+ +2H 2 O→Fe 2 (OH) 2 4+ +2H + (9)
The modularized management of the process is realized through computer modeling, which is beneficial to the coordinated operation of each stage. And detecting the water quality parameters to construct proper pH value regulating parameters (adding amounts of sulfuric acid and sodium hydroxide). The optimal catalyst addition amount, the oxidant addition amount and the current transmission intensity are researched through a chemical experiment, then the process operation parameters are set in a computer, and the computer is used for remote control, so that the equipment is operated under the optimal condition, and the unnecessary loss of chemical agents and electric energy is reduced.
Drawings
FIG. 1 is an overall view of the electro-assisted catalytic Fenton-like structure of the present invention;
FIG. 2 is an exploded view of the electro-assisted catalytic Fenton-like device of the present invention;
FIG. 3 is a structural view of a reaction chamber of the present invention;
FIG. 4 is a top view of the reaction chamber of the present invention;
fig. 5 is a structural view of an electrode clamping plate according to the present invention.
Detailed Description
The specific technical scheme of the invention is described with reference to the accompanying drawings.
The electrocatalytic oxidation device of the present invention will be described systematically with respect to its structure and features. As shown in fig. 1, which is a diagram of the overall structure of the electrocatalytic oxidation device, the device is provided with a water inlet end 100 and a water outlet end 200, wherein the water inlet end 100 is communicated with a first pH adjusting tank, the water outlet end 200 is communicated with a second pH adjusting tank, the overall shape of the electrocatalytic oxidation device is cuboid, and the top surface of the electrocatalytic oxidation device is designed into a configuration capable of being opened.
As shown in the exploded view of the electrocatalytic oxidation device of fig. 2, the electrocatalytic oxidation device configuration can be divided into three sections: a hatch 1 part, an electrode part and a reaction chamber 2 part. The hatch cover 1 has three total acrylic plates 51 which are different in structure and are nonconductive in material. The function of the hatch 1 is to prevent the spilling of waste water in the reaction device and the inflow of external liquids such as rainwater, and the hatch 1 also has the function of protecting the electrodes. The handles 12 are designed on the hatch cover 1, so that the hatch cover 1 is convenient to open when the electrode is replaced or the equipment is overhauled. Wherein, two hatchcovers 1 are provided with square notches which are convenient for the connection of a power supply and a fixed road line. The longest hatch cover 1 is provided with a medicament feeding opening 11, and the feeding opening is communicated with chemical medicament feeding equipment, so that the catalyst and the oxidant are conveniently added.
As shown in fig. 3, two pairs of electrodes, namely a carbon felt electrode 3 and a DSA electrode 4, are arranged in the electrocatalytic oxidation device, wherein the carbon felt electrode 3 is a cathode, and the DSA electrode 4 is an anode. The two electrode materials are commercial electrodes, and the DSA electrode 4 takes iron as a carrier and is provided with a ruthenium dioxide-iridium dioxide coating IrO on the surface 2 -RuO 2 . The carbon felt electrode 3 is fixed by the electrode clamping plate 5, and the DSA electrode 4 is fixed by the copper plate groove 21 in the reaction chamber 2. The power supply is respectively connected with the cathode and the anode through a fixed wire on the connecting electrode clamping plate 5 and a fixed wire on the copper plate groove 21, so that the electrode material is electrified. When the electrode is replaced, the used DSA electrode 4 is pulled out of the copper plate groove 21 from bottom to top, and the electrode clamping plate 5 is opened to replace the used carbon felt electrode 3.
The reaction chamber 2 is a third part which is also a channel part through which wastewater flows, and the whole part is formed by an acrylic plate 51, and the reason for using the material as a substrate is to prevent electric leakage, and the material has high strength and small weight, so that the reaction chamber is suitable for being used for establishing small-sized sewage treatment equipment. As shown in fig. 4, which is a top view of the reaction chamber 2 before and after the electrodes are placed, it can be clearly seen that the chamber is divided into two areas by a partition 6: a water intake compartment 300 and an electric field compartment 400. The water received by the water inlet compartment 300 is firstly wastewater, and secondly reagent water doped with a catalyst and an oxidant, and the different water bodies are fully mixed in the compartment so as to be beneficial to the subsequent normal operation of the electrocatalytic oxidation system. A further function of the separator 6 is to slow down the running water pressure of the water entering the water inlet and prevent the damage of the high water flow rate to the electrode material surface. As can be seen from the top view of the electrodes installed, the wastewater flows between the DSA electrodes 4 in an "S" fashion, which increases the residence time of the wastewater in the electric field zone 400, allowing the electrocatalytic oxidative degradation process to proceed substantially. The side length of the carbon felt electrode 3 is equal to the side length of the inside of the reaction cabin 2, when the electrode is put in, the side edge of the carbon felt electrode is fully attached to the inner wall of the reaction cabin 2, and due to the porous three-dimensional structure of the carbon felt electrode 3, wastewater flows through the carbon felt electrode 3 in a mode of directly passing through the inside of the electrode and penetrating through the electrode, and pollutants can be fully adsorbed by the carbon felt electrode 3 in the flowing mode, so that the degradation and elimination of the pollutants are facilitated.
The electrode clamping plate 5 for fixing the carbon felt electrode 3 is structured as shown in fig. 5. The clamping plate mainly comprises two acrylic plates 51, and the acrylic plates 51 are connected by a rotating shaft 54 so as to be rotatable and fixed. The acryl plates 51 are provided with handles 53 and fixed wires, the lower surfaces of the two acryl plates 51 are hollow, the hollow inner wall is covered with platinum sheet 55 materials, and the platinum sheet 55 is connected with the fixed wires to achieve the effect of energizing the carbon felt electrode 3. When the carbon felt electrode 3 is replaced, the electrode clamping plate 5 can be opened, the carbon felt electrode 3 can be pulled out, and the electrode clamping plate 5 clamps and fixes after a new electrode is replaced.
The unit which plays a main degradation contribution in the invention is an electrocatalytic oxidation device, the equipment is in a test operation stage at present, and the main pollutant degradation effect is obtained from preliminary experiments.
A small reactor with a volume of 160mL was constructed by reducing the reaction device, and the test of the operation effect was performed by using the common antibiotic Sulfamethoxazole (SMX) as a target pollutant (2 mg/L). After an adsorption time of 15 minutes, the adsorption degradation efficiency of the pollutants reaches about 16%, and the adsorption amount of the pollutants reaches 20% in the first 2 minutes, which shows that the carbon felt electrode (3) has good physical adsorption effect on SMX. By comparing the PMS/Fe (II) and the EC/PMS/Fe (III) systems, the degradation of the device to SMX can only reach about 60% under the condition of no power-on, and the degradation effect of the system to pollutants can reach 100% within the reaction time of 6 minutes after the power-on is performed, the power-on is favorable for improving the circulating efficiency of the catalyst, and the removal of the pollutants by the system is enhanced. The degradation rate of SMX in the system is fast, and the system has higher pollutant removal efficiency after side reaction.
The catalyst for realizing the catalytic effect is mainly Fe 2+ The source of ferrous iron is mainly the reduction of ferric iron on the surface of the cathode, so the regeneration rate of ferrous iron is also reacted with the operation performance of the device. The device can achieve about 40% of the efficiency of the regeneration of ferrous iron, and the system does not detect the generation of ferrous iron in the presence of PMS, which indicates that the regenerated catalyst is efficiently utilized by PMS, and the activation efficiency of PMS is improved. Under the condition that the operation time is 15 minutes, the utilization rate of PMS reaches 100 percent, which reflects the high utilization efficiency of the system and simultaneously shows that the device effluent does not contain residual oxidant, thereby being beneficial to reducing the influence on the environment and reducing the risk of secondary pollution.
Also utilize H 2 O 2 Satisfactory results are also achieved as oxidizing agents. In EC/Fe (III)/H 2 O 2 In the system, SMX pollutants reach complete degradation elimination after 8 minutes of reaction, which shows that the system has very high pollutant degradation efficiency.
In order to test the stability of the device, the invention sets up a repeatability experiment to study the degradation efficiency of SMX. The repeatability experiment is to add the same amount of pollutant concentration after each cycle (15 minutes) under the conditions of stable current intensity and oxidant addition amount, and simulate the continuous working condition of the device during real operation. The device still maintains 100% degradation efficiency for SMX during 10 consecutive runs, thus reflecting the stability of the device operation. Because the actual hospital wastewater quality contains a plurality of different types of organic pollutants, the degradation experiment of the device on the different pollutants is carried out. Common organic pollutants in several types of water bodies are selected: carbamazepine (CBZ), benzoic Acid (BA), nitrobenzene (NB), and Metronidazole (MNZ). The degradation efficiency of other pollutants except NB can reach 100% in 10 minutes, and NB can reach 70% after 30 minutes reaction, so that the device can show universality of oxidative degradation on various pollutants.
Likewise using different oxidizing agents (PMS, PDS, H) 2 O 2 ) Degradation of different contaminants in the formed system was also investigated. Five common contaminants treated include bisphenol a (BPA), carbamazepine (CBZ), metronidazole (MNZ), nitrobenzene (NB), and Atrazine (ATZ). Five pollutants reach 100% degradation efficiency in 10 minutes of reaction time under three oxidant systems, which indicates that the device built by the invention can effectively oxidize and eliminate the pollutants by using different oxidants.
The actual wastewater system is complex, and various anions exist, and the anions can have adverse effects on a certain link in the water treatment process. Different anions (Cl) were explored - 、H 2 PO 4 - 、HCO 3 - ) Influence on the running efficiency of the device. The device can still maintain 100% degradation effect on SMX within 15 minutes in the presence of various anions at different concentrations.
According to the data, the device can degrade and remove different types of pollutants in hospital wastewater under normal operation conditions, and can also remove escherichia coli, the device has high utilization efficiency on the catalyst and the oxidant, the problem of oxidant residue in effluent is avoided, and the device has good stability in repeated operation. Therefore, the device has great development prospect for treating hospital wastewater.
Compared with other water treatment processes, the invention has the characteristics of simple structure, convenient operation, small occupied area and the like, and can realize in-situ treatment of hospital wastewater, so that the device can be put near hospitals in various cities, and the cost of treating hospital wastewater is reduced. And the equipment can not generate malodorous and toxic gas in the running process, thereby affecting the surrounding environment.
Experiments prove that the device has good degradation effect on antibiotic drug pollutants and pathogenic bacteria (escherichia coli) which are stored in the hospital wastewater, so that the device can be used as a pretreatment unit of a biological treatment process, becomes a pretreatment stage for treating the hospital wastewater by using the biological degradation process, degrades various drug pollutants, is beneficial to the growth of subsequent microorganisms, and ensures the normal operation of a water treatment process.
Because the device has the characteristics of environmental friendliness, high efficiency, low running cost and the like, the device can be further improved into small-sized integrated equipment, and the wastewater treatment is carried out on areas with difficult pipe network construction and dispersed sewage, for example, in areas with inconvenient traffic such as rural areas, mountain areas and the like.
Claims (4)
1. An electro-catalysis Fenton-like device for treating hospital sewage is characterized by comprising an electro-catalysis oxidation device, wherein the electro-catalysis oxidation device is provided with a water inlet end (100) and a water outlet end (200), the water inlet end (100) is communicated with a first pH regulating tank, and the water outlet end (200) is communicated with a second pH regulating tank;
the electrocatalytic oxidation device comprises: a hatch (1), an electrode portion and a reaction chamber (2) portion; the hatch cover (1) is provided with a chemical agent feeding port (11), and the chemical agent feeding port is communicated with chemical agent feeding equipment;
two pairs of electrodes are arranged in the electrocatalytic oxidation device, namely a carbon felt electrode (3) and a DSA electrode (4), wherein the carbon felt electrode (3) is a cathode, and the DSA electrode (4) is an anode; the surface of the DSA electrode (4) taking iron as a carrier is provided with a ruthenium dioxide-iridium dioxide coating; the carbon felt electrode (3) is fixed by an electrode clamping plate (5), and the DSA electrode (4) is fixed by a copper plate groove (21) in the reaction chamber (2); the power supply is respectively connected with the cathode and the anode through a fixed wire on the connecting electrode clamping plate (5) and a fixed wire on the copper plate groove (21) so as to electrify the electrode material;
the interior of the reaction chamber (2) is divided into two areas by a baffle plate (6): a water inlet compartment (300) and an electric field compartment (400).
2. An electric catalysis Fenton-like device for treating hospital sewage is characterized in that the electrode clamping plate (5) comprises two acrylic plates (51), and the acrylic plates (51) are connected by a rotating shaft (54) so as to be rotatable and fixed; the acrylic plates (51) are provided with handles (53) and fixed wires, the lower surfaces of the two acrylic plates (51) are hollow, the hollow inner wall is covered with platinum sheets (55), and the platinum sheets (55) are connected with the fixed wires.
3. An electro-catalytic Fenton-like method for treating hospital sewage, characterized in that an electro-catalytic Fenton-like device for treating hospital sewage according to claim 1 or 2 is used, said method comprising the steps of:
after physical filtration, hospital wastewater firstly enters a first pH regulating tank, and sulfuric acid is added until the pH=3 to reach the reaction condition of the electrocatalytic oxidation technology;
after the acidic condition is reached, the wastewater enters an electrocatalytic oxidation device; the catalyst and the oxidant are added into the equipment through a medicament adding device, two pairs of electrodes are arranged in the electrocatalytic oxidation device, a carbon felt electrode (3) is used as a cathode, a DSA electrode (4) is used as an anode, and various active substances with high oxidability generated in the reaction oxidize and degrade pollutants and pathogenic bacteria in a water body in the flowing process of wastewater;
and (3) the wastewater after degradation flows into a second pH regulating tank, naOH is added to regulate the water body to a neutral condition, finally, the wastewater flows into a sedimentation tank to carry out solid-liquid separation, supernatant flows out through an overflow weir, and sediment is collected through sedimentation to carry out resource utilization.
4. An electro-catalysis Fenton-like method for treating hospital sewage according to claim 1, wherein said catalyst is Fe 2 (SO 4 ) 3 The method comprises the steps of carrying out a first treatment on the surface of the The oxidant is PMS, PDS, H 2 O 2 One or more of the following.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117486323A (en) * | 2024-01-02 | 2024-02-02 | 北京禹涛环境工程有限公司 | Electric catalytic oxidation hospital wastewater treatment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117486323A (en) * | 2024-01-02 | 2024-02-02 | 北京禹涛环境工程有限公司 | Electric catalytic oxidation hospital wastewater treatment device |
| CN117486323B (en) * | 2024-01-02 | 2024-03-22 | 北京禹涛环境工程有限公司 | Electric catalytic oxidation hospital wastewater treatment device |
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