Device and method for treating black and odorous water body in constructed wetland

Abstract

The invention discloses a device for treating black and odorous water in a constructed wetland in the field of sewage treatment, comprising: a fuel cell assembly comprising a reaction container, a cathode zone, an anode zone and a buffer zone from top to bottom in the reaction container, the cathode zone comprising a catalytic filler, the anode zone comprising an oxidation filler, and the buffer zone comprising a buffer filler; the oxidation filler is a composite material; the water passing assembly is communicated with the anode area and is used for slowly introducing black and odorous water into the anode area, and a plurality of horizontal water outlet pipes are vertically arranged on the reaction container at intervals; the current collection assembly is electrically connected with the anode region and the cathode region; the invention further discloses a manufacturing method. The fuel cell has the beneficial effects that the composite material prepared from the poly (butylene succinate), the manganese oxide and the manganese dioxide is used as the anode filler of the fuel cell, so that the formation of black and odorous substances can be reduced, and the treatment effect of the fuel cell on a black and odorous water body is improved.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a device and method for treating black and smelly water bodies with artificial wetlands. Background Art

[0002] Black and smelly water is one of the environmental issues that has received much attention at present. This phenomenon is mainly caused by the direct discharge of a large amount of untreated pollutants into the water body, and the aerobic decomposition of microorganisms causes the oxygen consumption rate in the water body to exceed the reoxygenation rate, resulting in a decrease in dissolved oxygen in the water body, forming an anoxic or even anaerobic environment, thereby reducing the self-purification capacity of the water body. Under anoxic or anaerobic conditions, organic matter is anaerobically decomposed to generate different types of black and odor-causing substances, which makes the water body black and emits a foul odor, causing a significant impact on the environment. Suspended flocs are the main carriers of black substances in black and smelly water bodies, including makinoite (tetragonal ferrous sulfide) and humic acid. Makinoite can directly affect the absorption of light incident on the water body and cause blackening; in addition to being a black substance itself, humic acid also promotes the generation and suspension of makinoite and causes blackening. Fulvic acid is a dissolved black-promoting substance that can interact with makinoite through hydroxyl, carboxyl and intermolecular hydrogen bonds to promote the suspension of makinoite to cause blackening.

[0003] For the treatment of black and odorous water bodies, the commonly used treatment technologies in engineering are mainly physical remediation, chemical remediation and biological remediation. As a biological remediation technology, artificial wetland-microbial fuel cell technology has the advantages of low construction cost, high pollutant removal rate and lasting pollution remediation effect compared with physical and chemical remediation technologies. Artificial wetland-microbial fuel cell technology uses the naturally existing anaerobic zone and aerobic zone in artificial wetlands as the cathode and anode of microbial fuel cells. While having good pollutant treatment performance, it realizes power production, achieves environmental and economic benefits simultaneously, and has broad application prospects. However, the content of bioavailable organic matter in black and odorous water bodies is low, and the concentration of nitrogen pollutants is high. This feature often affects the denitrification process, ultimately resulting in a low removal rate of nitrogen pollutants and a decrease in the system's power generation capacity. At the same time, the conventional artificial wetland-microbial fuel cell system has a low removal rate for black and odor-causing substances such as humic acid, fulvic acid, and hydrogen sulfide in black and odorous water bodies.

[0004] To this end, we propose a device and method for treating black and smelly water bodies using artificial wetlands. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a device and method for treating black and odorous water bodies using an artificial wetland, so as to solve the problem that the pollutant removal and electricity generation efficiency are not high enough when treating black and odorous water bodies using an artificial wetland-microbial fuel cell.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0007] A device for treating black and odorous water bodies with artificial wetlands comprises: a fuel cell assembly, comprising a reaction container, a cathode area, an anode area and a buffer area from top to bottom in the reaction container, the cathode area comprising a catalytic filler, the anode area comprising an oxidizing filler, the buffer area comprising a buffering filler, the oxidizing filler being a composite material, the composite material being used to absorb the odor of the black and odorous water body, intercept makino ore and enhance the degradation effect of humic acid and fulvic acid; a water-passing assembly, which is connected to the anode area and is used to slowly pass the black and odorous water into the anode area, and a plurality of horizontal water outlet pipes are vertically spaced on the reaction container; a current collecting assembly, which is electrically connected to the anode area and the cathode area, and the current collecting assembly is used to collect and observe the electrical energy generated in the fuel cell assembly.

[0008] By adopting a composite material that has the function of absorbing the odor of black and smelly water bodies, intercepting makino ore, and improving the degradation effect of humic acid and fulvic acid as the filler of the anode, the odor of the black and smelly water bodies can be greatly reduced, and the removal effect of odor-causing and blackening substances can be improved, thereby improving the treatment effect of black and smelly water bodies.

[0009] It is further defined that the cathode area also includes a cathode separator and a first conductive carbon felt, the first conductive carbon felt is placed on the cathode separator, the cathode separator is horizontally arranged in the catalytic filler, the catalytic filler is quartz sand, and windmill grass is planted on the catalytic filler; the cathode separator is arranged to support the first conductive carbon felt, and the cathode separator is arranged in the catalytic filler, which makes the arrangement of the first conductive carbon felt simpler, and planting windmill grass on the catalytic filler can stabilize the catalytic filler through the roots of the windmill grass, and microbial communities will gather at the roots of the windmill grass, which is more conducive to the operation of the fuel cell.

[0010] It is further defined that the anode region also includes an anode separator and a second conductive carbon felt, the second conductive carbon felt is placed on the anode separator, the anode separator is horizontally arranged in the composite material, and the composite material includes degradable solid carbon and manganese oxide supported on the degradable solid carbon.

[0011] It is further defined that manganese oxides include manganese oxide and manganese dioxide, and degradable solid carbon includes polybutylene succinate; a composite material is formed by compounding polybutylene succinate with MnO2, the composite material has a certain adsorption effect on odor, and then the odor is fully degraded by the microorganisms enriched on the composite material; the composite material has an interception effect on makino ore, which is tetragonal ferrous sulfide, and can activate iron circulation at the anode, induce the enrichment of more electroactive functional microorganisms, thereby improving the organic matter removal rate and electricity production efficiency; electroactive microorganisms are attached to the composite material, which can degrade black substances such as humic acid and fulvic acid through cometabolism, and the microorganisms The electrons generated during the metabolism of organic matter can be directly transferred to the electrode to form an electric current. This process improves the degradation efficiency of humic acid and fulvic acid by microorganisms; the MnO2 in the composite material can act as an electron donor to provide electrons for microorganisms, increase the current provided by the electrochemical action of microorganisms to the external circuit, promote the electrical cycle, and indirectly promote the degradation of organic matter; under the catalytic action of MnO2, some reactions will form superoxide free radicals, which have strong oxidizing ability and can oxidize difficult-to-degrade humic acid and fulvic acid; the manganese ions formed by the MnO in the composite material during the reaction will also complex and precipitate with various forms of sulfur ions, thereby improving the removal of odor-causing substances.

[0012] It is further defined that the ratio of polybutylene succinate, manganese oxide and manganese dioxide is 1 to 4:1:1.

[0013] It is further defined that the buffer filler is gravel with a particle size of 50 to 80 mm, the particle size of the composite material is 20 to 30 mm, and the particle size of the catalytic filler is 30 to 50 mm.

[0014] It is further defined that the water-passing component includes a water storage container, a peristaltic pump and a water-passing pipe; the input end of the peristaltic pump is connected to the water storage container through the water-passing pipe, and the output end is connected to the cathode area through the water-passing pipe; using a peristaltic pump as the pump body for conveying black and smelly water has a better conveying effect and can improve the stability of the device.

[0015] It is further defined that the current collection component includes a load resistor and a voltage collection system, the two ends of the load resistor are respectively connected to the first conductive carbon felt and the second conductive carbon felt through wires, and the two terminals of the voltage collection system are respectively connected to the wires at the two ends of the load resistor; by setting the current collection component, the electric energy generated by the fuel cell can be collected and observed.

[0016] A method for preparing the composite material comprises the following steps:

[0017] S1. Heating polybutylene succinate to obtain molten polybutylene succinate;

[0018] S2. manganese oxide and manganese dioxide powder are added to the molten polybutylene succinate, and then the mixture is mixed uniformly and heated for a second time to obtain a molten mixture;

[0019] S3. Cooling, washing and drying the molten mixture obtained by the secondary heating to form a composite material, and cutting and crushing the composite material into particles.

[0020] It is further defined that the heating temperature in step S1 is 120-130° C., and the heating time is 10-20 minutes; the secondary heating temperature in step S2 is also 120-130° C., and the heating time is 5-10 minutes.

[0021] The beneficial effect of the present invention is that by setting the composite material made of polybutylene succinate, manganese oxide and manganese dioxide as the anode filler of the fuel cell, the formation of black and smelly substances can be reduced and the treatment effect of the fuel cell on black and smelly water bodies can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a simple structural schematic diagram of the present invention.

[0023] The symbols of the components are as follows:

[0024] Fuel cell assembly 1, reaction vessel 11, cathode region 12, catalytic filler 121, cathode separator 122, first conductive carbon felt 123, anode region 13, oxidation filler 131, anode separator 132, second conductive carbon felt 133, buffer zone 14, buffer filler 141, water outlet pipe 15, windmill grass 16, water flow assembly 2, water storage container 21, peristaltic pump 22, water flow pipe 23, current collection assembly 3, load resistor 31, voltage acquisition system 32. DETAILED DESCRIPTION

[0025] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0026] Example:

[0027] like Figure 1As shown, a device for treating black and odorous water bodies with an artificial wetland includes a fuel cell assembly 1, a water-passing assembly 2 and a current collecting assembly 3; the fuel cell assembly 1 includes a reaction vessel 11, a cathode region 12, an anode region 13 and a buffer region 14 from top to bottom in the reaction vessel 11, and a plurality of horizontal water outlet pipes 15 are vertically spaced on the reaction vessel 11; the cathode region 12 includes a catalytic filler 121, the anode region 13 includes an oxidizing filler 131, and the buffer region 14 includes a buffering filler 141, the oxidizing filler 131 is a composite material, and the composite material is used to absorb black and odorous water. The cathode area 12 also includes a cathode separator 122 and a first conductive carbon felt 123, the first conductive carbon felt 123 is placed on the cathode separator 122, the cathode separator 122 is horizontally arranged in the catalytic filler 121, the catalytic filler 121 is quartz sand, and the catalytic filler 121 is planted with windmill grass 16; the anode area 13 also includes an anode separator 132 and a second conductive carbon felt 133, the second conductive carbon felt 133 is placed on the anode separator 132, and the anode separator 132 is horizontally arranged in the complex The composite material includes degradable solid carbon and manganese oxide loaded on the degradable solid carbon; the manganese oxide includes manganese oxide and manganese dioxide, and the degradable solid carbon includes polybutylene succinate; the ratio of polybutylene succinate, manganese oxide, and manganese dioxide is 1 to 4:1:1; the buffer filler 141 is gravel with a particle size of 50 to 80 mm, the particle size of the composite material is 20 to 30 mm, and the particle size of the catalytic filler 121 is 30 to 50 mm; the water-passing component 2 is used to slowly pass the black and smelly water into the anode area 13, and the water-passing component 2 includes a storage A water container 21, a peristaltic pump 22 and a water pipe 23; the input end of the peristaltic pump 22 is connected to the water storage container 21 through the water pipe 23, and the output end is connected to the cathode area 12 through the water pipe 23; the collector assembly 3 is used to collect and observe the electric energy generated in the fuel cell assembly 1; the collector assembly 3 includes a load resistor 31 and a voltage acquisition system 32, and the two ends of the load resistor 31 are respectively connected to the first conductive carbon felt 123 and the second conductive carbon felt 133 through wires, and the two terminals of the voltage acquisition system 32 are respectively connected to the wires at both ends of the load resistor 31.

[0028] By adopting a composite material that can absorb the odor of black and odorous water and improve the degradation effect of organic sulfur as the filler of the anode, the odor of the black and odorous water can be greatly reduced, and the removal effect of odor-causing and blackening substances can be improved, thereby improving the treatment effect of the black and odorous water. A cathode separator 122 is provided to support the first conductive carbon felt 123, and the cathode separator 122 is provided in the catalytic filler 121, so that the arrangement of the first conductive carbon felt 123 is simpler. Planting windmill grass 16 on the catalytic filler 121 can stabilize the catalytic filler 121 through the roots of the windmill grass 16, and 6 will gather microbial communities at the roots, which is more conducive to the operation of the fuel cell; polybutylene succinate and MnO2 are combined to form a composite material, which has a certain adsorption effect on odor, and then the odor is fully degraded by the microorganisms enriched on the composite material; the composite material has an interception effect on makino ore, which is a tetragonal ferrous sulfide, which can activate the iron cycle at the anode and induce the enrichment of more electroactive functional microorganisms, thereby improving the organic matter removal rate and power generation efficiency; the composite material is attached with electroactive microorganisms, which can degrade humic acid, fulvic acid and other organic matter-causing substances through cometabolism. The electrons generated by microorganisms in the metabolic process can be directly transferred to the electrodes to form an electric current. This process improves the degradation efficiency of humic acid and fulvic acid by microorganisms. The MnO2 in the composite material can act as an electron donor to provide electrons for microorganisms, increase the current provided by the electrochemical action of microorganisms to the external circuit, promote the electrical cycle, and indirectly promote the degradation of organic matter. Under the catalytic action of MnO2, some reactions will form superoxide free radicals, which have strong oxidizing ability and can oxidize humic acid and fulvic acid that are difficult to degrade. The MnO2 in the composite material is used in the reaction. The manganese ions formed will also complex and precipitate with various forms of sulfur ions, thereby improving the removal of odor-causing substances; the polybutylene succinate in the composite material is easily utilized by microorganisms as a carbon source and electron donor, which improves the intensity of the denitrification process. The reduction processes of nitrate and sulfate are in a competitive relationship. The increase in the intensity of the denitrification process will inhibit the sulfate reduction process and reduce the generation of black and odor-causing substances; the use of a peristaltic pump 22 as a pump body for conveying black and odorous water has a better conveying effect and can improve the stability of the device; by setting the collector assembly 3, the electrical energy generated by the fuel cell can be collected and observed.

[0029] A method for preparing the composite material comprises the following steps:

[0030] S1. The polybutylene succinate was heated at a temperature of 124° C. for 14 minutes to obtain a molten polybutylene succinate;

[0031] S2. manganese oxide and manganese dioxide powder were added to the molten polybutylene succinate, and then the mixture was mixed evenly and heated for a second time at a temperature of 126 ° C for 6 minutes to obtain a molten mixture;

[0032] S3. Cooling, washing and drying the molten mixture obtained by the secondary heating to form a composite material, and cutting and crushing the composite material into particles.

[0033] Embodiment 2:

[0034] The difference between Example 2 and Example 1 is only in the preparation method;

[0035] A method for preparing the composite material comprises the following steps:

[0036] S1. The polybutylene succinate was heated at a temperature of 120° C. for 10 minutes to obtain a molten polybutylene succinate;

[0037] S2. manganese oxide and manganese dioxide powder were added to the molten polybutylene succinate, and then the mixture was mixed evenly and heated for a second time at a temperature of 120 ° C for 5 minutes to obtain a molten mixture;

[0038] S3. Cooling, washing and drying the molten mixture obtained by the secondary heating to form a composite material, and cutting and crushing the composite material into particles.

[0039] Embodiment 3:

[0040] The difference between Example 3 and Example 1 is only in the preparation method;

[0041] A method for preparing the composite material comprises the following steps:

[0042] S1. The polybutylene succinate was heated at a temperature of 130° C. for 20 minutes to obtain a molten polybutylene succinate;

[0043] S2. manganese oxide and manganese dioxide powder were added to the molten polybutylene succinate, and then the mixture was mixed evenly and heated for a second time at a temperature of 130 ° C for 10 minutes to obtain a molten mixture;

[0044] S3. Cooling, washing and drying the molten mixture obtained by the secondary heating to form a composite material, and cutting and crushing the composite material into particles.

Claims

1. A device for treating black and smelly water bodies using artificial wetlands, characterized in that: include: A fuel cell assembly (1) comprises a reaction container (11), a cathode region (12), an anode region (13) and a buffer region (14) in the reaction container (11) from top to bottom, the cathode region (12) comprising a catalytic filler (121), the anode region (13) comprising an oxidizing filler (131), the buffer region (14) comprising a buffering filler (141), the oxidizing filler (131) being a composite material, the composite material being used to absorb odor from black and odorous water bodies, intercept makino ore, and enhance the degradation effect on humic acid and fulvic acid; A water-passing assembly (2) is connected to the anode area (13) and is used to slowly pass black and smelly water into the anode area (13). A plurality of horizontal water outlet pipes (15) are vertically spaced apart on the reaction container (11); A current collecting assembly (3) is electrically connected to the anode region (13) and the cathode region (12), and the current collecting assembly (3) is used to collect and observe the electrical energy generated in the fuel cell assembly (1).

2. The device for treating black and smelly water bodies by artificial wetlands according to claim 1, characterized in that: The cathode region (12) further comprises a cathode separator (122) and a first conductive carbon felt (123), wherein the first conductive carbon felt (123) is placed on the cathode separator (122), and the cathode separator (122) is horizontally arranged in the catalytic filler (121), wherein the catalytic filler (121) is quartz sand, and windmill grass (16) is planted on the catalytic filler (121).

3. The device for treating black and smelly water bodies by artificial wetlands according to claim 2, characterized in that: The anode region (13) further comprises an anode separator (132) and a second conductive carbon felt (133), wherein the second conductive carbon felt (133) is placed on the anode separator (132), and the anode separator (132) is horizontally arranged in the composite material, wherein the composite material comprises degradable solid carbon and manganese oxide supported on the degradable solid carbon.

4. The device for treating black and smelly water bodies by artificial wetlands according to claim 3 is characterized in that: The manganese oxide includes manganese oxide and manganese dioxide, and the degradable solid carbon includes polybutylene succinate.

5. The device for treating black and smelly water bodies by artificial wetlands according to claim 4, characterized in that: The ratio of polybutylene succinate, manganese oxide and manganese dioxide is 1-4:1:

1.

6. The device for treating black and smelly water bodies by artificial wetlands according to claim 5, characterized in that: The buffer filler (141) is gravel with a particle size of 50 to 80 mm, the particle size of the composite material is 20 to 30 mm, and the particle size of the catalytic filler (121) is 30 to 50 mm.

7. The device for treating black and smelly water bodies using artificial wetlands according to claim 5, characterized in that: The water-passing assembly (2) comprises a water storage container (21), a peristaltic pump (22) and a water-passing pipe (23); the input end of the peristaltic pump (22) is connected to the water storage container (21) through the water-passing pipe (23), and the output end of the peristaltic pump (22) is connected to the cathode region (12) through the water-passing pipe (23).

8. The device for treating black and smelly water bodies by artificial wetlands according to claim 5, characterized in that: The current collection component (3) comprises a load resistor (31) and a voltage collection system (32), wherein two ends of the load resistor (31) are respectively connected to the first conductive carbon felt (123) and the second conductive carbon felt (133) via wires, and two connection terminals of the voltage collection system (32) are respectively connected to the wires at both ends of the load resistor (31).

9. A method for producing a composite material as claimed in any one of claims 1 to 5, characterized in that: The steps include: S1. Heating polybutylene succinate to obtain molten polybutylene succinate; S2. manganese oxide and manganese dioxide powder are added to the molten polybutylene succinate, and then the mixture is mixed uniformly and heated for a second time to obtain a molten mixture; S3. Cooling, washing and drying the molten mixture obtained by the secondary heating to form a composite material, and cutting and crushing the composite material into particles.

10. A manufacturing method according to claim 9, characterized in that: The heating temperature in step S1 is 120-130° C., and the heating time is 10-20 minutes. The secondary heating temperature in step S2 is also 120-130° C., and the heating time is 5-10 minutes.

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