CN117902718A - Bioelectrochemical electrode and application thereof in bioelectrochemical device for treating refractory wastewater - Google Patents
Bioelectrochemical electrode and application thereof in bioelectrochemical device for treating refractory wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 35
- 239000011229 interlayer Substances 0.000 claims abstract description 28
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 27
- 239000010935 stainless steel Substances 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000010802 sludge Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 11
- 230000015556 catabolic process Effects 0.000 claims description 7
- 238000006731 degradation reaction Methods 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 230000002572 peristaltic effect Effects 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
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- 125000006850 spacer group Chemical group 0.000 description 3
- 229910000619 316 stainless steel Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
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- 229920000049 Carbon (fiber) Polymers 0.000 description 1
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- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
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- 238000006557 surface reaction Methods 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Biodiversity & Conservation Biology (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a bioelectrochemical electrode and application thereof in bioelectrochemical devices for treating refractory wastewater, wherein the bioelectrochemical electrode comprises an anode and a cathode which are oppositely arranged, and an insulating plastic interlayer arranged between the anode and the cathode, and the anode, the insulating plastic interlayer and the cathode are sequentially overlapped and laminated; the anode and the cathode are respectively provided with at least two arc sub-electrodes; in the anode and the cathode, the central angle of each arc sub-electrode is independently 120-180 degrees; in the anode and the cathode, a linear electrode is formed between every two adjacent arc sub-electrodes; the anode and the cathode are made of stainless steel fiber felt; after the bioelectrochemical electrode is applied, dead strains and the like can be effectively removed under the action of water flow, the formation and the stability of an electrochemical active bacterial biomembrane can be promoted, higher current density can be obtained, and the biodegradability of wastewater can be effectively improved.
Description
The invention relates to a bioelectrochemical electrode with arc structure and application thereof, which are divisional applications of Chinese patent application with application date of 2021, 04 month and 26, application number of 2021104520876.
Technical Field
The invention relates to the technical field of microbial electrochemistry, in particular to a bioelectrochemical electrode and application thereof in a bioelectrochemical device for treating refractory wastewater.
Background
Bioelectrochemical systems, which are a sustainable development technology that combines wastewater treatment with energy generation, have shown great potential in the pretreatment of refractory wastewater. The working principle is that the anode electrochemical active bacteria of the system oxidize organic substrates in the wastewater to generate electrons, and then the electrons are transferred to the cathode through an external circuit to act on the reduction reaction of the refractory substances, so that the aim of efficiently removing the refractory pollutants is fulfilled. Meanwhile, the organic matters in the wastewater can be directionally and intensively degraded when additional voltage is applied. Therefore, the system has the advantages of low external energy, high treatment efficiency and the like.
The electrode is a key part of the structure and the function of the bioelectrochemical system, and can promote the electron transfer of electrochemically active bacteria, so as to accelerate the degradation of the hardly degradable pollutants. The anode provides a place for metabolism of electrochemically active microorganisms, and reduces the cathode potential through anode reaction, thereby indirectly affecting the degradation efficiency of pollutants. The cathode is used as an electron donor, and directly influences the reduction efficiency of the refractory pollutants. As with the anode, the cathode also has a significant impact on the biofilm formed by the microorganism-electrode interactions. In general, electrode surface reactions are largely dependent on the characteristics of the electrode materials used. In the past few decades, electrodes have been mainly made of carbon-based materials, such as carbon brushes, carbon cloths, carbon fiber mats, graphite particles, etc., which have the characteristics of large specific surface area, corrosion resistance, good biocompatibility and high stability. Meanwhile, many researches on changing the characteristics of stainless steel materials by adopting methods of nitrogen doping, carbon nano tube loading, conductive polymer modification and the like are reported. However, due to the defects of poor economic feasibility and the like of the traditional carbon-based material and the modified stainless steel electrode, the traditional carbon-based material and the modified stainless steel electrode are difficult to be applied to actual large-scale degradation-resistant wastewater pretreatment, and the problems of low biological retention, poor treatment efficiency and the like are also caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an improved bioelectrochemical electrode and application thereof in bioelectrochemical devices for treating refractory wastewater, the novel bioelectrochemical electrode can improve the biodegradability of the refractory wastewater, and can solve one or more technical problems in the prior art, and at least provide a beneficial selection or creation condition.
In order to achieve the above purpose, the invention adopts a technical scheme that:
the bioelectrochemical electrode with the arc-shaped structure comprises an anode and a cathode which are oppositely arranged, wherein the anode and the cathode are respectively provided with at least one arc-shaped sub-electrode; and the central angle of each arc sub-electrode in the anode and the cathode is independently 60-180 degrees.
According to some preferred aspects of the invention, the central angle of each of said arc sub-electrodes is independently 120 ° -180 °.
In the invention, if the central angle of each arc sub-electrode is smaller than 60 degrees, the improvement on the biological retention is not obvious, meanwhile, the biocompatibility is not good, and the formation of the electrochemical active bacterial biological film is difficult to be better promoted; if the central angle of each arc sub-electrode is larger than 180 degrees, dead strains, impurity bacteria, suspended particles and the like can be accumulated, enrichment of electrochemical active bacteria is hindered, and the electron transfer rate can be seriously reduced.
According to some preferred aspects of the present invention, the anode and the cathode are respectively formed with at least two arc-shaped sub-electrodes, and a linear electrode is formed between every two adjacent arc-shaped sub-electrodes in the anode and the cathode, and the linear electrode can avoid interference between adjacent arc-shaped sub-electrodes, and can also reserve positions for the anode and the cathode in the later stage.
According to some preferred aspects of the invention, the anode and the cathode are parallel to each other.
According to some preferred aspects of the invention, the distance between the anode and the cathode is 0.001-3mm.
According to some preferred aspects of the invention, the bioelectrochemical electrode further comprises an insulating plastic barrier layer disposed between the anode and the cathode.
According to some preferred aspects of the invention, the insulating plastic barrier has a thickness of 0.001-3mm.
According to some preferred aspects of the invention, the anode, the insulating plastic interlayer and the cathode are sequentially overlapped and laminated.
In the invention, the distance between the anode and the cathode can be determined by the thickness of the insulating plastic interlayer, namely, when the anode, the insulating plastic interlayer and the cathode are sequentially overlapped and adhered, the distance between the anode and the cathode is the thickness of the insulating plastic interlayer; the insulating plastic interlayer can avoid the direct short circuit of the anode and the cathode in the use process, and meanwhile, the stability of the whole relative position relationship can be improved.
According to some preferred aspects of the present invention, the bioelectrochemical electrode further includes a fixing member for fixing the anode, the cathode and the insulating plastic spacer relatively, and the fixing member is made of an insulating material.
In some embodiments of the present invention, the fixing member may be an insulating plastic tie, and is fixed by punching the insulating plastic tie.
According to some preferred aspects of the invention, the anode and the cathode are made of stainless steel fiber felt, which is more economical and corrosion resistant than traditional carbon-based electrodes; compared with the common stainless steel net, the stainless steel net has better biocompatibility and conductivity; and the method has the advantages of good economy, simple acquisition and strong operability. In some embodiments of the invention, the stainless steel fiber felt may be a type 316 stainless steel fiber felt with a filtration accuracy of 400 μm.
The invention provides another technical scheme that: the bioelectrochemical device for treating the refractory wastewater comprises the bioelectrochemical electrode with the arc-shaped structure, and the anode and the cathode respectively extend along the vertical direction.
According to some preferred aspects of the invention, the bioelectrochemical electrode is disposed in an anaerobic reactor; more preferably, the anaerobic reactor is an up-flow anaerobic sludge blanket with an aspect ratio of 5-15:1.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
Based on the problems of poor economic feasibility, biological retention, treatment efficiency and the like of bioelectrochemical electrodes in the prior art, the invention innovatively provides an improved cathode and anode provided with arc-shaped sub-electrodes, and the central angle of each arc-shaped sub-electrode is limited to be 60-180 degrees independently, so that the biocompatibility of the electrode is improved, dead bacteria, impurity bacteria and suspended particles can be effectively removed under the action of water flow, the formation of an electrochemical active bacterial biomembrane and the stability of the electrochemical active bacterial biomembrane are further promoted, and meanwhile, the cathode and anode of the electrode can be arranged closer, the electron transfer efficiency between the electrodes is improved, and higher current density is obtained, so that the electrode can be applied to pretreatment of refractory wastewater, the biodegradability of the wastewater can be effectively improved, and the treatment burden of a rear biological treatment section is relieved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic structural view of a bioelectrochemical electrode having an arc structure according to embodiment 1 of the present invention;
FIG. 2 is an enlarged schematic view of FIG. 1 at A;
In example 1, an anode; 2. a cathode; 3. an insulating plastic interlayer; 4. an insulating plastic tie; a1, arc type sub-electrodes of the anode; a2, arc sub-electrodes of the cathode; b1, a linear electrode of an anode; b2, a linear electrode of the cathode; central angle, alpha;
FIG. 3 is a schematic structural view of a bioelectrochemical electrode having an arc structure according to embodiment 2 of the present invention;
Wherein, in example 2, 1', anode; 2', a cathode; 3', insulating plastic interlayer; 4', insulating plastic strapping; central angle, alpha';
FIG. 4 is a schematic structural view of a bioelectrochemical electrode having an arc structure according to embodiment 3 of the present invention;
Wherein, in example 2, 1 ", anode; 2 ", cathode; 3', insulating plastic interlayer; 4', an insulating plastic ribbon; central angle, alpha'.
Detailed Description
The present invention will be described in detail with reference to the drawings and the detailed description, so that the above objects, features and advantages of the present invention can be more clearly understood. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides a bioelectrochemical electrode with an arc structure, which is based on the problems of poor economic feasibility, biological retention, treatment efficiency and the like of bioelectrochemical electrodes in the prior art, and comprises an anode and a cathode which are oppositely arranged, wherein at least one arc-shaped sub-electrode is respectively formed on the anode and the cathode; and the central angle of each arc sub-electrode in the anode and the cathode is independently 60-180 degrees, preferably 120-180 degrees.
In the invention, if the central angle of each arc sub-electrode is smaller than 60 degrees, the improvement on the biological retention is not obvious, meanwhile, the biocompatibility is not good, and the formation of the electrochemical active bacterial biological film is difficult to be better promoted; if the central angle of each arc sub-electrode is larger than 180 degrees, dead strains, impurity bacteria, wastes and the like can be accumulated, enrichment of electrochemical active bacteria is hindered, and the electron transfer rate can be seriously reduced.
Preferably, the anode and the cathode are respectively provided with at least two arc-shaped sub-electrodes, and in the anode and the cathode, a linear electrode is formed between every two adjacent arc-shaped sub-electrodes, and the linear electrode can avoid interference between the adjacent arc-shaped sub-electrodes, and can reserve positions for the anode and the cathode to be fixed at the later stage.
Preferably, the anode and the cathode are parallel to each other, and the distance between the anode and the cathode is 0.001-3mm.
Preferably, the bioelectrochemical electrode further comprises an insulating plastic interlayer arranged between the anode and the cathode, the thickness of the insulating plastic interlayer is 0.001-3mm, and the anode, the insulating plastic interlayer and the cathode are sequentially overlapped and laminated.
In the invention, the distance between the anode and the cathode can be determined by the thickness of the insulating plastic interlayer, namely, when the anode, the insulating plastic interlayer and the cathode are sequentially overlapped and adhered, the distance between the anode and the cathode is the thickness of the insulating plastic interlayer; the insulating plastic interlayer can avoid the direct short circuit of the anode and the cathode in the use process, and meanwhile, the stability of the whole relative position relationship can be improved.
Further, the bioelectrochemical electrode further comprises a fixing piece for relatively fixing the anode, the cathode and the insulating plastic interlayer, and the fixing piece is made of insulating materials. Specifically, the fixing piece can be an insulating plastic ribbon and is fixed by punching through the insulating plastic ribbon.
Preferably, the anode and the cathode are made of stainless steel fiber felt, which has better economy and corrosion resistance than the traditional carbon-based electrode; compared with the common stainless steel net, the stainless steel net has better biocompatibility and conductivity; and the method has the advantages of good economy, simple acquisition and strong operability. In some embodiments of the invention, the stainless steel fiber felt may be a type 316 stainless steel fiber felt with a filtration accuracy of 400 μm.
The invention also provides application of the bioelectrochemical electrode with the arc-shaped structure, and the bioelectrochemical electrode is applied to a bioelectrochemical device for treating refractory wastewater, wherein the bioelectrochemical device comprises the bioelectrochemical electrode, and the anode and the cathode respectively extend along the vertical direction.
Preferably, the bioelectrochemical electrode is disposed in an anaerobic reactor; more preferably, the anaerobic reactor is an up-flow anaerobic sludge bed, the height-diameter ratio is 5-15:1, the bioelectrochemical electrode with the arc structure can be matched with the up-flow anaerobic sludge bed with larger height-diameter ratio, and the matching effect is more excellent.
Specifically, in the present invention, the bioelectrochemical electrode having the arc structure (hereinafter also referred to as bioelectrochemical electrode having the arc sub-electrode) may be prepared by a conventional method, for example, a stainless steel fiber felt may be cut to a specific requirement, and then a cylindrical roller is used for pressing and rough shaping to form a stainless steel fiber felt electrode having an arc-shaped side, and finally the stainless steel fiber felt electrode is fixed with an insulating plastic interlayer, and the redundant part is cut.
Meanwhile, in the invention, the bioelectrochemical electrode formed with the arc-shaped sub-electrode is applied to a bioelectrochemical device for treating refractory wastewater by adopting the following method, and the method specifically comprises the following steps:
1) Pretreating the bioelectrochemical electrode formed with the arc sub-electrode: washing surface impurities with deionized water, naturally air-drying, soaking in acetone solution for 12h, air-drying the electrode, soaking in 5% sulfuric acid solution for 2h, washing with deionized water, and standing in clean place.
2) Constructing a bioelectrochemical system: placing the bioelectrochemical electrode which is processed in the step (1) and is formed with the arc-shaped sub-electrode into a bioelectrochemical reactor such as an up-flow anaerobic sludge bed, leading out a section of lead wire by using titanium wire to be communicated with a direct current power supply, and arranging a constant value resistor and a reference electrode.
3) Starting the bioelectrochemical system: anaerobic activated sludge is inoculated into the reactor, a peristaltic pump is adopted to pump the degradation-resistant waste water into the reactor, and a direct current power supply provides voltage, so that the aim of improving the biodegradability of the degradation-resistant waste water is achieved.
More preferably, the anaerobic activated sludge is obtained from the actual degradation-resistant wastewater UASB, and the sludge concentration is 2000-3000mg/L; the hydraulic retention time controlled by the peristaltic pump is 12h; the direct current power supply provides 0.5V voltage; the biochemical BOD 5/COD=0.1-0.2 of the refractory wastewater.
Specifically, the present invention is further described below with reference to three examples.
Example 1:
Constructing a bioelectrochemical electrode formed with arc sub-electrodes: selecting a 316 type stainless steel fiber felt with the filtering precision of 400 mu m, cutting the 316 type stainless steel fiber felt into two stainless steel fiber felts with the size of L multiplied by B (length multiplied by width) =133.8X40 mm, pressing and roughly shaping one stainless steel fiber felt by adopting a cylindrical roller with the radius of 20mm, pressing and roughly shaping the other stainless steel fiber felt by adopting a cylindrical roller with the radius of 22mm to form an electrode with an arc-shaped sub-electrode, finally punching and fixing the electrode with an insulating plastic interlayer 3 by adopting an insulating plastic ribbon 4, and further cutting redundant parts.
As shown in fig. 1-2, the whole electrode has 4 arc-shaped sub-electrodes (specifically, in the anode 1, may be simply called an arc-shaped sub-electrode a1 of the anode; in the cathode 2, may be simply called an arc-shaped sub-electrode a2 of the cathode) with a radius of 20mm (the cathode 2), a radius of 22mm (the anode 1), and a central angle α of 60 °; a linear electrode (specifically, a linear electrode b1 of the anode 1, which may be simply called an anode, and a linear electrode b2 of the cathode 2, which may be simply called a cathode) is formed between every two adjacent arc sub-electrodes, and the length of the linear electrode is set to 10mm in this example; washing impurities on the surface of the electrode by deionized water, naturally airing, soaking in an acetone solution for 12 hours, soaking in a 5% sulfuric acid solution for 2 hours after the electrode is aired, and finally washing with deionized water and then placing in a clean place. And the insulating plastic interlayer 3 with the thickness D of 2mm and the same size and configuration as the electrodes is placed between the anode and the cathode, and the two electrodes and the insulating plastic interlayer 3 are further fixed by using the perforation of the insulating plastic ribbon 4, so that the contact between the electrodes is avoided.
Constructing a bioelectrochemical reactor: the shaped bioelectrochemical electrode with the arc sub-electrode is placed into a bioelectrochemical reactor, a section of lead is led out by a titanium wire with the diameter of 1mm to be communicated with a direct current power supply, and a fixed value resistor with the diameter of 10 omega and a saturated calomel reference electrode are arranged. Starting the bioelectrochemical reactor: anaerobic activated sludge is inoculated into a reactor UASB (height to diameter ratio is 10) so that the sludge concentration in the reactor reaches about 2500mg/L, a peristaltic pump is adopted to pump nondegradable waste water with BOD 5/COD=0.15 into the reactor, the hydraulic retention time is controlled to be 12h, and a direct current power supply is used for providing voltage of 0.5V.
Example 2:
This example differs from example 1 in that the cut stainless steel fiber mat has dimensions l×b=217.6x40 mm, and the resulting electrode has 4 arc-shaped sub-electrodes of 20mm radius, 4 radius 22mm and 120 ° central angle, and the other steps remain the same as example 1 (specifically, as shown in fig. 3, the anode is labeled 1', the cathode is labeled 2', the insulating plastic spacer is labeled 3', the insulating plastic ribbon is labeled 4', and the central angle is labeled α ').
Example 3:
This example differs from example 1 in that the dimensions of the cut stainless steel fibrous mat were l×b=331.3×40mm, and the resulting electrode had a total of 4 circular arcs of 20mm radius, 4 radii of 22mm and 180 ° central angle; other steps were consistent with example 1 (specifically, as shown in FIG. 4, the anode was labeled 1 ", the cathode was labeled 2", the insulating plastic spacer was labeled 3 ", the insulating plastic tie was labeled 4", and the central angle was labeled α "in the electrode).
Monitoring experiment:
The current is recorded by the data recorder every 10 min; BOD5 and COD indexes monitor bioelectrochemical in-out water samples every day. After example 1, example 2 and example 3 were run to the steady state, the current was stabilized at 6.25.+ -. 0.31mA, 8.47.+ -. 0.11mA and 17.86.+ -. 0.30mA, respectively; the BOD5/COD elevation values are respectively stabilized at 0.24+/-0.04, 0.28+/-0.02 and 0.33+/-0.02.
Results demonstrate that:
Output current aspect: the results of the examples show that the bioelectrochemical electrode formed with the arc-shaped sub-electrode maintains the current output of the whole system at a high level due to the good conductivity and excellent biological retention. Meanwhile, the current values exhibited by the electrodes with different central angles are different. The research shows that the biological film formed by the electrochemical active bacteria is less likely to be disturbed by water flow along with the increase of the central angle, so that the current output by the electrode with the inferior arc configuration increases along with the increase of the central angle. The electrode with the arc configuration of half arc shows the optimal output current (17.86+/-0.30 mA) and current density (1.78+/-0.03A/m <2 >), and the half arc configuration not only gives consideration to certain biological retention, but also relieves the problem of low electron transfer rate caused by sludge decomposition, disintegration and other phenomena. The results of the examples in terms of BOD5/COD change of the incoming and outgoing water show that the bioelectrochemical electrode formed with the arc-shaped sub-electrode can further improve the biodegradability of the hardly degradable wastewater due to the good conductivity and the excellent biological retention thereof. Among them, the bioelectrochemical electrode formed with the half-arc sub-electrode in example 3, having a central angle of 180 °, exhibited an optimal BOD5/COD increase value of 0.33.+ -. 0.02, which is consistent with the high output current exhibited thereby. The lifting value behavior in the remaining embodiments increases with increasing central angle.
In summary, the above experimental results show that the bioelectrochemical electrode formed with the arc-shaped sub-electrode has significant advantages in the method for improving the biodegradability of the refractory wastewater, and particularly has unexpected advantages in the bioelectrochemical electrode formed with the half-arc-shaped sub-electrode in which the central angle is 180 degrees.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The application of the bioelectrochemical electrode with the arc-shaped structure in the bioelectrochemical device for treating the degradation-resistant wastewater is characterized in that the bioelectrochemical electrode comprises an anode and a cathode which are oppositely arranged, and an insulating plastic interlayer arranged between the anode and the cathode, and the anode, the insulating plastic interlayer and the cathode are sequentially overlapped and laminated;
The anode and the cathode are respectively provided with at least two arc sub-electrodes; and the central angle of each arc sub-electrode in the anode and the cathode is independently 120-180 degrees;
In the anode and the cathode, straight-line electrodes are formed between every two adjacent arc sub-electrodes;
the anode and the cathode are made of stainless steel fiber felt.
2. The use of a bioelectrochemical electrode having an arc structure according to claim 1 in a bioelectrochemical device for treating hardly degradable wastewater, wherein said anode and said cathode are parallel to each other.
3. Use of a bioelectrochemical electrode having an arc structure according to claim 1 or 2 in a bioelectrochemical device for treating hardly degradable wastewater, wherein the anode and the cathode extend in a vertical direction, respectively.
4. The use of the bioelectrochemical electrode having an arc structure according to claim 1 in a bioelectrochemical device for treating hardly degradable wastewater, wherein the thickness of the insulating plastic barrier layer is 0.001-3mm;
The bioelectrochemical electrode further comprises a fixing piece which is used for fixing the anode, the cathode and the insulating plastic interlayer relatively, and the fixing piece is made of insulating materials.
5. The use of a bioelectrochemical electrode having an arc structure according to claim 4 in a bioelectrochemical device for treating hardly degradable waste water, wherein said fixing member is an insulating plastic band.
6. Use of a bioelectrochemical electrode having an arc-shaped structure according to claim 1 in a bioelectrochemical device for treating hardly degradable waste water, characterized in that in said use, said bioelectrochemical electrode is arranged in an anaerobic reactor.
7. The use of the bioelectrochemical electrode with the arc-shaped structure in the bioelectrochemical device for treating refractory wastewater according to claim 6, wherein the anaerobic reactor is an up-flow anaerobic sludge bed, and the height-diameter ratio is 5-15:1.
8. The use of the bioelectrochemical electrode with the arc-shaped structure in the bioelectrochemical device for treating refractory wastewater according to claim 6, wherein in the use, the bioelectrochemical electrode with the arc-shaped structure is applied to an up-flow anaerobic sludge bed for treating refractory wastewater by adopting the following method, and the method specifically comprises the following steps:
(1) Pretreating the bioelectrochemical electrode with the arc-shaped structure: washing surface impurities with deionized water, naturally airing, soaking in an acetone solution, soaking in a sulfuric acid solution after the electrode is aired, and finally washing with deionized water and then placing in a clean place for standby;
(2) Constructing a bioelectrochemical system: placing the bioelectrochemical electrode with the arc-shaped structure treated in the step (1) into an up-flow anaerobic sludge bed, leading out a section of wire by using titanium wires, communicating with a direct current power supply, and arranging a constant value resistor and a reference electrode;
(3) Starting the bioelectrochemical system: and inoculating anaerobic activated sludge into the up-flow anaerobic sludge bed, pumping the nondegradable wastewater into the up-flow anaerobic sludge bed by adopting a peristaltic pump, and providing voltage by a direct current power supply.
9. The application of the bioelectrochemical electrode with the arc-shaped structure in the bioelectrochemical device for treating the refractory wastewater, according to claim 8, wherein the sludge concentration of the anaerobic activated sludge is 2000-3000mg/L; and/or, BOD 5/COD=0.1-0.2 of the biochemical property of the refractory wastewater.
10. The bioelectrochemical electrode with the arc-shaped structure is characterized by comprising an anode and a cathode which are oppositely arranged, and an insulating plastic interlayer arranged between the anode and the cathode, wherein the anode, the insulating plastic interlayer and the cathode are sequentially overlapped and laminated;
The anode and the cathode are respectively provided with at least two arc sub-electrodes; and the central angle of each arc sub-electrode in the anode and the cathode is independently 120-180 degrees;
In the anode and the cathode, straight-line electrodes are formed between every two adjacent arc sub-electrodes;
The anode and the cathode are made of stainless steel fiber felt;
The anode and the cathode are prepared by the following method: cutting the stainless steel fiber felt to specific requirements, then adopting a cylindrical roller to press and coarsely shape, forming a stainless steel fiber felt electrode with an arc-shaped side surface, finally fixing the stainless steel fiber felt electrode with an insulating plastic interlayer, and cutting redundant parts.
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