CN212609818U - Sewage biological treatment device - Google Patents
Sewage biological treatment device Download PDFInfo
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- CN212609818U CN212609818U CN202020697827.3U CN202020697827U CN212609818U CN 212609818 U CN212609818 U CN 212609818U CN 202020697827 U CN202020697827 U CN 202020697827U CN 212609818 U CN212609818 U CN 212609818U
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Abstract
The invention provides a biological sewage treatment device, and particularly relates to the field of sewage treatment. The device comprises an anaerobic tank and an aerobic tank, wherein the bottom ends of the anaerobic tank and the aerobic tank are communicated; a common filler I and an anode filler are arranged in the anaerobic tank; a common filler II is arranged in the aerobic tank, a cathode floats on the surface of the aerobic tank, and an aeration system is arranged at the bottom of the aerobic tank; the anode filler in the anaerobic tank and the cathode floating on the surface of the aerobic tank are connected through at least one group of leads and a heating resistor to form a closed circuit. The device and the process are mainly used in the field of sewage treatment, the pollutant removal rate is high, the process energy consumption is low, the sludge yield is low, a sedimentation tank is not required, and the device is simplified.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a biological sewage treatment device.
Background
With the development of technology and the improvement of living standard, the requirements of people on living environment including water environment are continuously improved, and sewage discharged in daily life, production and the like can be discharged after being treated to reach the standard. However, sewage treatment is one of the high energy consuming industries. In cities, the power consumption of sewage treatment is often more than 10 percent of the power consumption of the whole city. In rural areas, sewage treatment mainly adopts three modes, namely a decentralized treatment mode, a village centralized treatment mode and a town drainage pipe network bringing-in mode, so that the rural sewage treatment popularization rate is low, and the treatment energy consumption is relatively high. Therefore, it is necessary to reduce the energy consumption of the biological sewage treatment process.
Conventional biological sewage treatment processes include anaerobic-aerobic (a/O) processes, Microbial Fuel Cell (MFC) techniques, and the like. The A/O process can degrade organic pollutant and has certain denitrification and dephosphorization function, and is one improved active sludge process. The MFC technology is a device for directly converting chemical energy in organic matters into electric energy by using microorganisms, under the anaerobic environment of an anode, the organic matters are decomposed under the action of anaerobic microorganisms and release electrons and protons, the electrons are transferred to a cathode through an external circuit to form current, the protons are transferred to the cathode through a proton exchange membrane, and an oxidant (generally oxygen) obtains the electrons at the cathode and is reduced and combined with the protons to form water.
Disclosure of Invention
The invention provides a sewage biological treatment device, which couples an A/O process and an MFC technology, and improves the device, thereby improving the removal rate of pollutants in sewage, reducing the process energy consumption and the sludge yield, avoiding the use of a sedimentation tank and simplifying the device.
The invention creatively provides a sewage biological treatment device, which comprises an anaerobic tank and an aerobic tank, wherein the bottom ends of the anaerobic tank and the aerobic tank are communicated;
a common filler I and an anode filler are arranged in the anaerobic tank;
a common filler II is arranged in the aerobic tank, a cathode floats on the surface of the aerobic tank, and an aeration system is arranged at the bottom of the aerobic tank;
the anode filler in the anaerobic tank is connected with the cathode floating on the surface of the aerobic tank through at least one group of leads and a heating resistor to form a closed circuit.
Further, the volume ratio of the anode filler to the common filler I is 30-100%.
Furthermore, the area ratio of the cathode to the surface of the aerobic pool is 30-100%.
Further, the anode filler and the cathode are made of conductive materials; the conductive material includes at least one of a carbon felt or a carbon cloth.
Furthermore, the volume ratio of the anaerobic tank to the aerobic tank is 1:1-1: 3.
Further, the device also comprises an air compressor, wherein the air compressor is used for providing oxygen for the aeration system; and a gas flow meter is arranged between the air compressor and the aeration system.
Further, the device also comprises an adjusting tank, and the adjusting tank is communicated with the anaerobic tank.
Furthermore, a peristaltic pump and a liquid flow meter are connected between the regulating tank and the anaerobic tank.
The invention has the following advantages:
the invention provides a biological sewage treatment device, wherein an MFC is coupled in an A/O process, an anode filler in an anaerobic tank is used as an anode of the MFC, a cathode floating on the surface of an aerobic tank is used as a cathode of the MFC, the anode of the MFC is subjected to an oxidation reaction to convert chemical energy of pollutants into electric energy, and the cathode of the floating MFC can intercept sludge, oxygen and the like, so that the biological sewage treatment device has the advantages of high pollutant removal rate, low process energy consumption, low sludge yield and no need of a sedimentation tank, and the device is simplified.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
FIG. 1 is a schematic structural view of a biological sewage treatment apparatus according to an embodiment of the present invention;
description of reference numerals:
1. an anaerobic tank; 2. an aerobic tank; 31. common filler one; 32. a second common filler; 4. anode filler; 5. a cathode; 6. a heating resistor; 7. a wire; 8. an aeration system; 9. an air compressor; 10. a gas flow meter; 11. a regulating tank; 12. a peristaltic pump; 13. a liquid flow meter; 14. the aqueous layer was stabilized.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
As shown in fig. 1, an embodiment of the present invention provides a biological sewage treatment apparatus, which includes an anaerobic tank 1 and an aerobic tank 2, wherein bottom ends of the anaerobic tank 1 and the aerobic tank 2 are communicated;
a common filler I31 and an anode filler 4 are filled in the anaerobic tank 1;
a second common filler 32 is filled in the aerobic tank 2, a cathode 5 floats on the surface of the aerobic tank 2, and an aeration system 8 is arranged at the bottom of the aerobic tank 2;
an anode filler 4 in the anaerobic tank 1 and a cathode 5 floating on the surface of the aerobic tank 2 are connected through at least one group of wires 7 and a heating resistor 6 (power resistor) to form a closed circuit.
Considering that the Microbial Fuel Cell (MFC) technology and the anaerobic-aerobic (A/O) process both utilize anaerobic and aerobic environments, the inventor couples the MFC in the A/O process, takes the anode filler in the anaerobic tank as the anode of the MFC, takes the cathode floating on the surface of the aerobic tank as the cathode of the MFC, and the anode of the MFC performs oxidation reaction to convert the chemical energy of pollutants into electric energy, and the cathode of the floating MFC can intercept sludge, oxygen and the like, so that the pollutant removal rate is high, the process energy consumption is low, the sludge yield is low, a sedimentation tank is not needed, and the device is simplified.
Specifically, in the MFC, in the anaerobic tank, at the anode of the MFC, the pollutants are decomposed under the action of anaerobic microorganisms to release electrons and protons, the electrons are transferred to the cathode of the MFC through an external circuit, and the protons directly flow to the cathode of the aerobic tank; in the aerobic tank, oxygen reacts with electrons and protons at the cathode of the MFC to generate water. For A/O, in the anaerobic tank, the function of pollutants in anaerobic microorganisms can also realize nitrogen and phosphorus removal; in the aerobic tank, pollutants are decomposed under the action of aerobic microorganisms, and the like.
Meanwhile, the floating cathode is arranged on the surface of the anaerobic tank and is used as the cathode of the MFC, so that firstly, the diffusion of dissolved oxygen in the aerobic tank to the air can be reduced, meanwhile, the oxygen in the air can be absorbed, and the energy consumption of the A/O process is reduced; secondly, the floating cathode can prevent sludge from being discharged, so that the strains in the sludge can fully play a role in an aerobic tank, and the cost and energy consumption of subsequent sludge treatment can be reduced; and thirdly, a sedimentation tank is omitted, and the device is simplified.
In addition, the anode filler in the anaerobic tank is used as the anode of the MFC, the cathode floating on the surface of the aerobic tank is used as the cathode of the MFC, and the MFC is connected through one or more groups of leads and heating resistors to form a closed circuit, so that the MFC can convert chemical energy into electric energy and convert the electric energy into heat energy by the resistors, and can be used for heating sewage to be treated, the temperature of sewage treatment is increased, and the reaction rate is further increased.
It should be noted that the cathode 5 floats on the surface of the aerobic tank 2, and mainly the cathode 5 floats on the surface of the stable water layer 14 (without filling material) formed by the water to be treated in the aerobic tank 2. That is, the cathode 5 floats in the stabilized water layer 14 of the aerobic tank 2 or floats on the surface of the stabilized water layer 14.
In the embodiment of the invention, the common filler I31 and the common filler II 32 refer to common biological fillers, including porous suspension ball fillers and the like. Wherein, the first common stuffing 31 in the anaerobic tank 1 can be the same as the second common stuffing 32 in the aerobic tank 2.
In an embodiment of the present invention, the anode filler 4 and the cathode 5 are made of conductive materials; the conductive material comprises carbon felt and carbon cloth. The carbon felt, the carbon cloth and the like are all multi-fiber materials, the manufactured cathode plate can intercept microorganisms, oxygen and the like, the retention time is prolonged, the microorganisms can be further degraded, meanwhile, dissolved oxygen generated by aeration can be fully utilized, removal of pollutants in water is enhanced, and therefore the quality of effluent water is further improved.
In one embodiment of the present invention, the volume ratio of the anode filler 4 to the common filler one 31 is 30-100%. Preferably, the volume ratio of the anode filler 4 to the common filler one 31 is 80%. Because the surface layer dissolved oxygen of the anaerobic tank 1 is higher, the anode filler 4 is filled below the surface layer of the anaerobic tank 1.
In an embodiment of the invention, the area ratio of the cathode 5 to the surface of the aerobic tank 2 is 30-100%, and preferably, the area ratio of the cathode 5 to the surface of the aerobic tank 2 is 100%. The cathode 5 may be in the form of a cathode plate or the like, floating on the stabilizing water layer 14.
In one embodiment of the invention, the volume ratio of the anaerobic tank 1 to the aerobic tank 2 is 1:1-1: 3. Preferably, the volume ratio of the anaerobic tank 1 to the aerobic tank 2 is 1: 2. The top parts of the anaerobic tank 1 and the aerobic tank 2 are both arranged in an open way.
In one embodiment of the present invention, the apparatus further comprises an air compressor 9, and the air compressor 9 provides oxygen for the aeration system 8. And a gas flow meter 10 is arranged between the air compressor 9 and the aeration system 8. The dissolved oxygen in the aerobic section is 2-4 mg/L. The dissolved oxygen in the anaerobic tank 1 is less than 0.2 mg/L.
In one embodiment of the present invention, the aeration system 8 comprises an aeration tray. The aeration disc at the bottom of the aerobic tank 2 can disperse air delivered by an air compressor 9 (air compressor) into water in the form of bubbles, so that oxygen is fully dissolved into the water to form rotation and up-and-down flow of water flow, and uniform oxygen enrichment of water in the aerobic tank 2 is realized.
In one embodiment of the invention, the device further comprises a regulating tank 11, and the regulating tank 11 is communicated with the anaerobic tank 1. A peristaltic pump 12 and a liquid flow meter 13 are connected between the regulating tank 11 and the anaerobic tank 1. The adjusting tank 11 is used for containing sewage to be treated, and the sewage in the adjusting tank 11 enters the anaerobic tank 1 through a water pipe and a peristaltic pump 12.
The invention also provides a sewage biological treatment process, which utilizes the device and comprises the following steps:
inoculating sludge containing anaerobic microorganisms into the anaerobic tank 1, inoculating sludge containing aerobic microorganisms into the aerobic tank 2, allowing sewage to be treated to enter the anaerobic tank 1, reacting and removing corresponding pollutants under the action of the anaerobic microorganisms, allowing the sewage to be treated to flow into the aerobic tank 2 from the bottom of the anaerobic tank 1, and reacting and removing the corresponding pollutants under the action of the aerobic microorganisms; the floating cathode 5 can intercept the sludge in the aerobic tank 2, thereby further improving the reaction effect.
In the embodiment of the invention, the anaerobic tank 1 can be inoculated with sludge containing anaerobic microorganisms, the aerobic tank 2 can be inoculated with sludge containing aerobic microorganisms, and the aerobic tank 2 and the anaerobic tank 1 can be inoculated with sludge containing anaerobic microorganisms and aerobic microorganisms simultaneously, so that the aerobic reaction and the anaerobic reaction can be ensured to proceed smoothly. The pollutants contained in the sewage to be treated comprise organic matters, nitrogen-containing pollutants, phosphorus-containing pollutants and the like.
The invention also provides an application of the device in the biological treatment of rural sewage. The device has the advantages of high pollutant removal efficiency, low energy consumption, low sludge discharge and the like, so that the device can be independently used for rural sewage treatment, and the energy utilization rate is improved.
The invention will be explained in more detail below with reference to examples.
Example 1
As shown in figure 1, the A/O sewage biological treatment device of the coupling cathode floating type MFC provided by the invention is adopted to treat the effluent of the septic tank; wherein the content of the first and second substances,
the device comprises an anaerobic tank and an aerobic tank, wherein the bottom ends of the anaerobic tank and the aerobic tank are communicated;
a porous suspension ball filler is arranged in the anaerobic tank, and carbon felt balls (the carbon felt balls account for 30% of the total filler by volume);
a porous suspension ball filler is arranged in the aerobic tank, a carbon felt plate (the area ratio of the carbon felt plate to the surface of the aerobic tank is 100%) floats on the surface of the aerobic tank, and an aeration disc is arranged at the bottom of the anaerobic tank;
the carbon felt balls in the anaerobic tank and the carbon felt plates floating on the surface of the aerobic tank are connected through three groups of wires and heating resistors to form a closed circuit;
the length, width and height of the device are respectively 1.00m, 0.50m and 1.15m, the effective volumes of the anaerobic tank and the aerobic tank are 500L in total, and the volume ratio is 1:3, the effective volumes are 125L and 375L respectively, the hydraulic retention time is 24 hours, and the resistance value of the heating resistor is 1k omega.
Comparative example 1
The difference from the embodiment 1 is that the carbon felt balls in the anaerobic tank 4 are arranged in an open circuit mode, and cathodes floating on the surface of the anaerobic tank 4 are not connected into a closed circuit mode through a lead and a heating resistor. I.e. only a/O processes.
Comparative example 2
The difference from example 1 is that the MFC cathode was inserted into the aerobic tank, instead of floating on the surface of the aerobic tank.
Test examples
(1) The two devices of example 1 and comparative example 1 were operated continuously for one year under the same energy consumption condition, the temperature, dissolved oxygen and voltage of the devices were monitored every day, water inlet and water outlet were sampled and monitored at regular intervals, and the experimental results are shown in table 1.
TABLE 1
| Item | Example 1 | Comparative example 1 |
| COD removal Rate (%) | 71-86(76) | 65-81(71) |
| Ammonia nitrogen removal (%) | 85-93(88) | 80-86(83) |
| TN removal Rate (%) | 59-76(68) | 56-71(63) |
| TP removal Rate (%) | 48-65(55) | 42-59(51) |
| Sludge production | Is 18 to 24 percent less than the proportion of 1 | - |
| Generating electricity | 0.70V、0.45V、0.30V | Is free of |
As can be seen from Table 1, the sewage treatment effect of the apparatus according to example 1 (closed loop arrangement of A/O-cathode floating MFC) was slightly better, the COD removal rate reached more than 70%, and the average value was 76%. The ammonia nitrogen removal rate, the TN removal rate and the TP removal rate are obviously superior to those of a sewage biological treatment device which only contains an A/O process and is prepared by a comparative example 1 (an A/O-cathode floating MFC is in an open circuit arrangement). The sludge yield (mass) was reduced by about 20% relative to comparative example 1. The output levels of the three groups of electrodes from deep to shallow (figure 1) are respectively 0.70V, 0.45V and 0.30V, so that the MFC can convert chemical energy into electric energy to realize energy conservation.
In addition, in order to further obtain the sewage treatment effect obtained by working the example 1 for one year and prolong the treatment time of the device of the comparative example 1, when the device of the comparative example 1 achieves the sewage treatment effect obtained by the device of the example 1, the operation energy consumption of the device of the comparative example 1 is increased by 15-20%, and simultaneously, the sludge yield (quality) is increased by 20%.
(2) The two devices of example 1 and comparative example 2 were operated continuously for one year under the same energy consumption condition, the temperature, dissolved oxygen and voltage of the devices were monitored every day, water inlet and water outlet were sampled and monitored at regular intervals, and the experimental results are shown in table 2.
TABLE 2
Note: the average value is shown in parentheses.
It can be seen that the device with floating cathode proposed in example 1 of the present application (closed loop arrangement of a/O-cathode floating MFC) has significantly improved sewage treatment effect, greatly improved electricity generation capacity, and significantly reduced sludge yield, compared to the device with cathode directly inserted into the aerobic tank in comparative example 2 (closed loop arrangement of a/O-cathode inserted into MFC).
The invention is not limited to the specific embodiments described above, but rather should be construed as broadly as possible, and all changes, equivalents, and improvements that fall within the spirit and scope of the invention are intended to be embraced therein.
Claims (8)
1. A sewage biological treatment device, which is characterized in that,
comprises an anaerobic tank (1) and an aerobic tank (2), wherein the bottom end of the anaerobic tank (1) is communicated with the bottom end of the aerobic tank (2);
a common filler I (31) and an anode filler (4) are arranged in the anaerobic tank (1);
a second common filler (32) is arranged in the aerobic tank (2), a cathode (5) floats on the surface of the aerobic tank (2), and an aeration system (8) is arranged at the bottom of the aerobic tank (2);
an anode filler (4) in the anaerobic tank (1) is connected with a cathode (5) floating on the surface of the aerobic tank (2) through at least one group of leads (7) and a heating resistor (6) to form a closed circuit.
2. The apparatus of claim 1,
the volume ratio of the anode filler (4) to the common filler I (31) is 30-100%.
3. The apparatus of claim 1,
the area ratio of the cathode (5) to the surface of the aerobic tank (2) is 30-100%.
4. The apparatus of claim 1,
the anode filler (4) and the cathode (5) are made of conductive materials; the conductive material includes at least one of a carbon felt or a carbon cloth.
5. The apparatus of claim 1,
the volume ratio of the anaerobic tank (1) to the aerobic tank (2) is 1:1-1: 3.
6. The apparatus of claim 1,
the device also comprises an air compressor (9), wherein the air compressor (9) is used for providing oxygen for the aeration system (8); and a gas flowmeter (10) is arranged between the air compressor (9) and the aeration system (8).
7. The apparatus of claim 1,
the device also comprises an adjusting tank (11), wherein the adjusting tank (11) is communicated with the anaerobic tank (1).
8. The apparatus of claim 7,
a peristaltic pump (12) and a liquid flowmeter (13) are connected between the regulating tank (11) and the anaerobic tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020697827.3U CN212609818U (en) | 2020-04-30 | 2020-04-30 | Sewage biological treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020697827.3U CN212609818U (en) | 2020-04-30 | 2020-04-30 | Sewage biological treatment device |
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| Publication Number | Publication Date |
|---|---|
| CN212609818U true CN212609818U (en) | 2021-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020697827.3U Expired - Fee Related CN212609818U (en) | 2020-04-30 | 2020-04-30 | Sewage biological treatment device |
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| Country | Link |
|---|---|
| CN (1) | CN212609818U (en) |
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2020
- 2020-04-30 CN CN202020697827.3U patent/CN212609818U/en not_active Expired - Fee Related
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Granted publication date: 20210226 |