Device and method for treating black and odorous water body by using constructed wetland

Abstract

The application discloses a device for treating black and odorous water body in a constructed wetland in the field of sewage treatment, and relates to a fuel cell assembly, a water passing assembly, a current collecting assembly and a manufacturing method. The beneficial effects of the application are that the composite material made of polybutylene succinate, manganese oxide and manganese dioxide is used as the anode filler of the fuel cell, the formation of black and odorous substances can be reduced, and the treatment effect of the fuel cell on the black and odorous water body can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment, in particular to a device and method for treating black and odorous water body by using constructed wetland. BACKGROUND

[0002] Black and odorous water body is one of the environmental problems that have attracted much attention at present, and is widely distributed in China. This phenomenon is mainly due to a large amount of untreated pollutants directly discharged into the water body, and microorganisms decomposed under aerobic conditions, so that the oxygen consumption rate in the water body is higher than the oxygen regeneration rate, resulting in a decrease in dissolved oxygen in the water body, forming an anoxic or anaerobic environment, thereby reducing the self-purification ability of the water body. Under anoxic or anaerobic conditions, organic matter is decomposed anaerobically to generate different types of blackening and odor-causing substances, making the water body black and emitting a foul odor, which has a significant impact on the environment. Suspended flocs are the main carriers of blackening substances in black and odorous water body, including makino ore (tetragonal phase ferrous sulfide) and humic acid, etc. Makino ore can directly affect the absorption of light incident into the water body and cause blackening. In addition to being a black substance itself, humic acid also promotes the generation and suspension of makino ore to cause blackening. Fulvic acid is a dissolved blackening substance that can interact with makino ore through hydroxyl, carboxyl and intermolecular hydrogen bonds to promote the suspension of makino ore and cause blackening.

[0003] For the treatment of black and odorous water body, the commonly used treatment technologies in engineering mainly include physical repair, chemical repair and biological repair. As a biological repair technology, the constructed wetland-microbial fuel cell technology has the advantages of low construction cost, high pollutant removal rate and long-lasting pollution repair effect compared with physical and chemical repair technologies. The constructed wetland-microbial fuel cell technology uses the naturally existing anaerobic and aerobic zones in the constructed wetland as the cathode and anode of the microbial fuel cell, which not only has good pollutant treatment performance, but also realizes power generation, synchronously achieving environmental and economic benefits, and has broad application prospects. However, the content of biologically available organic matter in black and odorous water body is relatively low, and the concentration of nitrogen pollutants is relatively high, which often affects the denitrification process, ultimately leading to low nitrogen pollutant removal rate and decreased power generation capacity of the system. At the same time, the conventional constructed wetland-microbial fuel cell system has a low removal rate of blackening and odor-causing substances such as humic acid, fulvic acid and hydrogen sulfide in black and odorous water body.

[0004] Therefore, we propose a device and method for treating black and odorous water body by using constructed wetland. SUMMARY

[0005] In view of the above shortcomings of the prior art, the present application provides a device and method for treating black and odorous water body by using constructed wetland, to solve the problem of low pollutant removal and power generation efficiency when treating black and odorous water body by using constructed wetland-microbial fuel cell.

[0006] To achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows:

[0007] The device for treating black and odorous water body by artificial wetland comprises a fuel cell assembly, 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 catalytic filler, the anode zone comprising oxidation filler, and the buffer zone comprising buffer filler, the oxidation filler being a composite material for adsorbing odor of the black and odorous water body, trapping makino ore and improving degradation effect on humic acid and fulvic acid, a water passing assembly in communication with the anode zone for slowly passing the black and odorous water body into the anode zone, and a current collecting assembly in electrical connection with the anode zone and the cathode zone for collecting and observing electric energy generated in the fuel cell assembly.

[0008] By using the composite material as the filler of the anode, which has the functions of adsorbing odor of the black and odorous water body, trapping makino ore and improving degradation effect on humic acid and fulvic acid, the odor of the black and odorous water body can be greatly reduced, the removal effect of odor-causing and blackening substances can be improved, and the treatment effect on the black and odorous water body can be improved.

[0009] Further limitation, the cathode zone further comprises a cathode screen and a first conductive carbon felt, the first conductive carbon felt is placed on the cathode screen, the cathode screen is horizontally arranged in the catalytic filler, the catalytic filler is quartz sand, and the catalytic filler is planted with pinna palmaris.

[0010] Further limitation, the anode zone further comprises an anode screen and a second conductive carbon felt, the second conductive carbon felt is placed on the anode screen, the anode screen is horizontally arranged in the composite material, and the composite material comprises degradable solid carbon and manganese oxide loaded on the degradable solid carbon.

[0011] Further limited, the oxides of manganese include manganese oxide and manganese dioxide, the degradable solid carbon includes polybutylene succinate; the 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 microorganisms enriched on the composite material; the composite material has a trapping effect on makinoite, which is tetragonal ferrous sulfide, can activate the iron cycle at the anode, and induce the enrichment of more electroactive functional microorganisms, thereby improving the removal rate of organic matter and the power generation efficiency; the electroactive microorganisms attached to the composite material can degrade humic acid, fulvic acid and other blackening substances through co-metabolism, and the electrons produced by the microorganisms in the metabolic process can be directly transferred to the electrode to form an electric current, which improves the degradation efficiency of humic acid and fulvic acid by microorganisms; MnO2 in the composite material can provide electrons for microorganisms as an electron donor, increase the current provided by the electrochemical effect of microorganisms to the external circuit, and promote the performance of the electric cycle, thereby indirectly promoting the degradation of organic matter; under the catalytic action of MnO2, part of the reaction will form superoxide free radicals, which have strong oxidizing ability and can oxidize refractory humic acid and fulvic acid; the manganese ions formed by 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] Further limited, the ratio of polybutylene succinate, manganese oxide and manganese dioxide is 1-4:1:1.

[0013] Further limited, the buffer filler is gravel with a particle size of 50-80mm, the particle size of the composite material is 20-30mm, and the particle size of the catalytic filler is 30-50mm.

[0014] Further limited, the water passing assembly includes a water storage container, a peristaltic pump and a water passing pipe; the input end of the peristaltic pump is communicated with the water storage container through the water passing pipe, and the output end is communicated with the cathode zone through the water passing pipe; the peristaltic pump is used as the pump body for conveying black and odorous water, which has better conveying effect and can improve the stability of the device.

[0015] Further limited, the current collecting assembly includes a load resistor and a voltage acquisition system, the two ends of the load resistor are connected to the first conductive carbon felt and the second conductive carbon felt through wires respectively, and the two connection terminals of the voltage acquisition system are connected to the wires at the two ends of the load resistor respectively; by setting the current collecting assembly, the electric energy generated by the fuel cell can be collected and observed.

[0016] A manufacturing method for manufacturing the composite material described above, comprising the following steps:

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

[0018] S2. Add manganese oxide and manganese dioxide powder into the molten polybutylene succinate, then mix the mixture uniformly, and perform secondary heating to obtain a molten mixture;

[0019] S3. Cool, wash and dry the molten mixture obtained by secondary heating to form a composite material, and cut and break the composite material into granular form.

[0020] Further limited, the heating temperature in step S1 is 120-130 DEG C, and the heating time is 10-20 minutes; the secondary heating temperature in step S2 is also 120-130 DEG C, and the heating time is 5-10 minutes.

[0021] The beneficial effects of the present application are: the composite material made of polybutylene succinate, manganese oxide and manganese dioxide as an anode filler of a fuel cell can reduce the formation of black and smelly substances, and improve the treatment effect of the fuel cell on black and smelly water bodies. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a simple structure diagram of the present application.

[0023] In which the symbols of various components are as follows:

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

[0025] The specific embodiments of the present application are described below to facilitate those skilled in the art to understand the present application, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, these changes are obvious, and all the inventions utilizing the concept of the present application are within the scope of protection.

[0026] Embodiment:

[0027] As Figure 1As shown, the device for treating black and odorous water body by artificial wetland comprises a fuel cell assembly 1, a water passing assembly 2 and a current collecting assembly 3; the fuel cell assembly 1 comprises a reaction container 11, a cathode zone 12, an anode zone 13 and a buffer zone 14 from top to bottom in the reaction container 11, and a plurality of water outlet pipes 15 vertically and spaced apart on the reaction container 11; the cathode zone 12 comprises catalytic filler 121, the anode zone 13 comprises oxidation filler 131, and the buffer zone 14 comprises buffer filler 141; the oxidation filler 131 is a composite material, which is used for adsorbing the odor of the black and odorous water body, intercepting makino ore and improving the degradation effect on humic acid and fulvic acid; the cathode zone 12 further comprises a cathode screen 122 and a first conductive carbon felt 123, the first conductive carbon felt 123 is arranged on the cathode screen 122, and the cathode screen 122 is horizontally arranged in the catalytic filler 121, the catalytic filler 121 is quartz sand, and the catalytic filler 121 is planted with cyperus alternifolius 16; the anode zone 13 further comprises an anode screen 132 and a second conductive carbon felt 133, the second conductive carbon felt 133 is arranged on the anode screen 132, and the anode screen 132 is horizontally arranged in the composite material; the composite material comprises degradable solid carbon and manganese oxide loaded on the degradable solid carbon; the manganese oxide comprises manganese oxide and manganese dioxide, and the degradable solid carbon comprises polybutylene succinate; the ratio of polybutylene succinate, manganese oxide and manganese dioxide is 1-4:1:1; the buffer filler 141 is gravel with a particle size of 50-80 mm, the particle size of the composite material is 20-30 mm, and the particle size of the catalytic filler 121 is 30-50 mm; the water passing assembly 2 is used for slowly passing the black and odorous water body into the anode zone 13, and 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 communicated with the water storage container 21 through the water passing pipe 23, and the output end is communicated with the cathode zone 12 through the water passing pipe 23; the current collecting assembly 3 is used for collecting and observing the electric energy generated in the fuel cell assembly 1; the current collecting assembly 3 comprises a load resistor 31 and a voltage acquisition system 32, and the load resistor 31 is connected to the first conductive carbon felt 123 and the second conductive carbon felt 133 through wires at both ends, and the voltage acquisition system 32 is connected to the wires at both ends of the load resistor 31.

[0028] The composite material has the effects of adsorbing odor of black and odorous water body and improving the degradation effect on organic sulfur, so that the odor of the black and odorous water body can be greatly reduced, and the removal effect of blackening and odor-causing substances can be improved, and the treatment effect on the black and odorous water body can be improved; the cathode screen 122 supports the first conductive carbon felt 123, and the cathode screen 122 is arranged in the catalytic filler 121, so that the first conductive carbon felt 123 is arranged more simply, the horsetail 16 is planted on the catalytic filler 121, the horsetail 16 can stabilize the catalytic filler 121 through the root hairs of the horsetail 16, and microorganism colonies are gathered at the root hairs of the horsetail 16, so that the operation of the fuel cell is more favorable; the polybutylene succinate and MnO2 are compounded to form the composite material, the composite material has a certain adsorption effect on odor, and then the odor is fully degraded by microorganisms enriched on the composite material; the composite material has a trapping effect on makinoite, which is a tetragonal ferrous sulfide, and the iron cycle can be activated at the anode to induce enrichment of more electrically active functional microorganisms, so that the organic matter removal rate and the power generation efficiency are improved; the electrically active microorganisms are attached to the composite material, can degrade humic acid, fulvic acid and other blackening substances through co-metabolism, and the electrons generated by the microorganisms in the metabolism process can be directly transferred to the electrode to form an electric current, so that the degradation efficiency of the microorganisms on humic acid and fulvic acid is improved; the MnO2 in the composite material can provide electrons for the microorganisms as an electron donor, increase the current provided by the microorganism electrochemistry to the external circuit, promote the electric cycle, and indirectly promote the degradation of organic matter; under the catalysis of the MnO2, part of the reaction will form superoxide free radicals, the free radicals have strong oxidation ability and can oxidize refractory humic acid and fulvic acid; the manganese ions formed in the reaction of the Mn in the composite material also complex and precipitate with various forms of sulfur ions, so that the removal of odor-causing substances is improved; the polybutylene succinate in the composite material is easy to be used by microorganisms as a carbon source and an electron donor, so that the strength of the denitrification process is improved, there is a competitive relationship between the reduction processes of nitrate and sulfate, the improvement of the strength of the denitrification process can inhibit the reduction process of the sulfate, and the generation of blackening and odor-causing substances is reduced; the peristaltic pump 22 is used as the pump body for conveying the black and odorous water body, so that the conveying effect is better and the stability of the device is improved; the current collecting assembly 3 is arranged, so that the electric energy generated by the fuel cell can be collected and observed.

[0029] A manufacturing method for manufacturing the composite material, comprising the following steps:

[0030] S1. The polybutylene succinate is heated, the heating temperature is 124℃, and the heating time is 14 minutes, so that the molten polybutylene succinate is obtained;

[0031] S2. Add manganese oxide, manganese dioxide powder to the molten polybutylene succinate, then mix the mixture uniformly, and perform secondary heating, the temperature of the secondary heating is 126℃, the heating time is 6 minutes, to obtain a molten mixture;

[0032] S3. Cool, wash and dry the molten mixture obtained by the secondary heating to form a composite material, and cut and break the composite material into granular form.

[0033] Example 2:

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

[0035] A manufacturing method for manufacturing the composite material described above, comprising the following steps:

[0036] S1. Heat polybutylene succinate, the heating temperature is 120℃, the heating time is 10 minutes, to obtain molten polybutylene succinate;

[0037] S2. Add manganese oxide, manganese dioxide powder to the molten polybutylene succinate, then mix the mixture uniformly, and perform secondary heating, the temperature of the secondary heating is 120℃, the heating time is 5 minutes, to obtain a molten mixture;

[0038] S3. Cool, wash and dry the molten mixture obtained by the secondary heating to form a composite material, and cut and break the composite material into granular form.

[0039] Example 3:

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

[0041] A manufacturing method for manufacturing the composite material described above, comprising the following steps:

[0042] S1. Heat polybutylene succinate, the heating temperature is 130℃, the heating time is 20 minutes, to obtain molten polybutylene succinate;

[0043] S2. Add manganese oxide, manganese dioxide powder to the molten polybutylene succinate, then mix the mixture uniformly, and perform secondary heating, the temperature of the secondary heating is 130℃, the heating time is 10 minutes, to obtain a molten mixture;

[0044] S3. Cool, wash and dry the molten mixture obtained by the secondary heating to form a composite material, and cut and break the composite material into granular form.

Claims

1. A device for treating black and odorous water bodies using constructed wetlands, characterized in that, include: The fuel cell assembly (1) includes a reaction vessel (11), a cathode region (12), an anode region (13), and a buffer zone (14) within the reaction vessel (11) from top to bottom. The cathode region (12) includes a catalytic filler (121), the anode region (13) includes an oxidation filler (131), and the buffer zone (14) includes a buffer filler (141). The oxidation filler (131) is a composite material, which includes biodegradable solid carbon and manganese oxides supported on the biodegradable solid carbon. The composite material is used to adsorb odor from black and odorous water bodies, intercept Maginot minerals, and improve the degradation effect on humic acid and fulvic acid. The water supply component (2) is connected to the anode area (13) and is used to slowly introduce black and odorous water into the anode area (13). The reaction container (11) is provided with several horizontal water outlet pipes (15) at vertical intervals. The current collector (3) is electrically connected to the anode region (13) and the cathode region (12). The current collector (3) is used to collect and observe the electrical energy generated in the fuel cell assembly (1).

2. The apparatus for treating black and odorous water bodies using constructed wetlands according to claim 1, characterized in that, The cathode region (12) further includes a cathode mesh (122) and a first conductive carbon felt (123). The first conductive carbon felt (123) is placed on the cathode mesh (122). The cathode mesh (122) is horizontally arranged in the catalytic packing (121). The catalytic packing (121) is quartz sand, and windmill grass (16) is planted on the catalytic packing (121).

3. The apparatus for treating black and odorous water bodies using constructed wetlands according to claim 2, characterized in that, The anode region (13) further includes an anode mesh (132) and a second conductive carbon felt (133), the second conductive carbon felt (133) being placed on the anode mesh (132), the anode mesh (132) being horizontally disposed within the composite material.

4. The apparatus for treating black and odorous water bodies using constructed wetlands according to claim 3, characterized in that, The manganese oxides include manganese oxide and manganese dioxide, and the biodegradable solid carbon includes polybutylene succinate.

5. The apparatus for treating black and odorous water bodies using constructed 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 apparatus for treating black and odorous water bodies using constructed wetlands according to claim 5, characterized in that, The buffer filler (141) is gravel with a particle size of 50~80mm, the composite material has a particle size of 20~30mm, and the catalytic filler (121) has a particle size of 30~50mm.

7. The apparatus for treating black and odorous water bodies using constructed wetlands according to claim 5, characterized in that, The water supply assembly (2) includes a water storage container (21), a peristaltic pump (22) and a water supply pipe (23); the input end of the peristaltic pump (22) is connected to the water storage container (21) through the water supply pipe (23), and the output end is connected to the cathode area (12) through the water supply pipe (23).

8. The apparatus for treating black and odorous water bodies using constructed wetlands according to claim 5, characterized in that, The current collector assembly (3) includes a load resistor (31) and a voltage acquisition system (32). The two ends of the load resistor (31) are connected to the first conductive carbon felt (123) and the second conductive carbon felt (133) respectively by wires. The two terminals of the voltage acquisition system (32) are connected to the wires at both ends of the load resistor (31).

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