CN112299553A - Method for solving cathode scaling of electrocatalysis biological aerated filter - Google Patents
Method for solving cathode scaling of electrocatalysis biological aerated filter Download PDFInfo
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- CN112299553A CN112299553A CN202011152135.1A CN202011152135A CN112299553A CN 112299553 A CN112299553 A CN 112299553A CN 202011152135 A CN202011152135 A CN 202011152135A CN 112299553 A CN112299553 A CN 112299553A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention provides a method for solving the cathode scaling phenomenon in an electrocatalysis aeration biological filter, which can effectively solve a series of subsequent problems such as reactor blockage, low current efficiency or hardened particle electrodes and the like, and also can increase gas distribution hysteresis and uneven gas distribution in the back washing process, so that the local back washing strength is insufficient to cause a series of operation management problems such as hardened filter materials, high operation pressure, unsmooth water passing and the like. When the electro-catalytic biological aerated filter is subjected to back washing, the cathode and the anode of the electro-catalytic biological aerated filter are exchanged; carrying out air washing on the reactor for 5-8 minutes; flushing for 7-10 minutes by using gas-water combination; and (5) washing for 8-10 minutes, and finally exchanging the cathode and the anode again. A large number of experimental phenomena prove that after a reactor which is used for a long time uses the back washing method provided by the invention, the scale on the surface of the cathode is obviously reduced, and after the newly-built reactor uses the back washing method provided by the invention, the scale on the cathode is not obviously deposited.
Description
Technical Field
The invention relates to a solution to the problem of cathode scaling of an electrocatalysis biological aerated filter. Can be used for advanced treatment units of sewage and wastewater plants.
Background
At present, biological methods are the most common wastewater treatment processes. The biological method can remove odor, organic matters and chromaticity in water, and has the advantages of mature process, convenient management, low running cost and simple and easy operation. However, the biochemical method is not thorough in decomposing new toxic organic pollutants, has low decomposition speed and sometimes loses activity due to poisoning; the electrochemical method is a method in which pollutants in water are efficiently removed by obtaining or losing electrons to perform an oxidation-reduction reaction, and a higher oxidation reaction represented by hydroxyl radicals can also be generated. The electrochemical technology is fast in development, simple in reaction equipment, strong in treatment capacity, easy to operate and control, but has the problems of a plurality of side reactions, such as oxygen evolution, chlorine evolution and hydrogen evolution, low current efficiency, high operation cost, high energy consumption and the like. In view of the characteristics and existing limitations of the two methods, a new electrobiological coupling method for coupling electrochemical reaction and microbial reaction in the same reactor has been gradually paid attention to all countries around the world and has great development potential. Wherein, the combination of the three-dimensional electrochemistry and the biological aerated filter effectively improves the treatment efficiency of the traditional biological aerated filter.
However, most of the research on the electrocatalytic biological aerated filter belongs to a laboratory bench test or pilot plant stage, and the biological aerated filter of a sewage plant is rarely modified. The main reason is that the cathode scaling phenomenon in the electrocatalysis biological aerated filter is serious, which easily causes a plurality of problems such as: (1) in the back flushing process of the electro-catalytic biological filter longitudinally arranged as shown in the attached figure 1, scaling on a cathode plate often causes uneven water distribution and air distribution, the back flushing strength of a local area is overlarge, the water distribution often causes hysteresis, the local area close to an air inlet end firstly distributes water and air or even the strength is far beyond the designed strength, and the water distribution and air distribution of other areas have obvious hysteresis and extremely uneven strength; (2) in the back flushing process of the electro-catalytic biological filter transversely arranged as shown in figure 2, the reactor is blocked, the current efficiency is low and the particle electrode is hardened due to scaling on the cathode plate; (3) in the back washing process of the annular enlarged anode electro-catalytic biofilter shown in the attached figure 3, excessive deposition is caused to the lower part of the reactor due to scaling on the central cathode column, so that the problems of reactor blockage, low current efficiency, hardening of particle electrodes, mixed bed of a supporting layer and a filter material layer and the like are caused. Various phenomena make daily production and operation work tired. At present, the problem of the current situation is urgently solved by a method for scaling the cathode of the electrocatalysis biological aerated filter and a using method thereof.
Disclosure of Invention
The invention provides a method for solving cathode scaling in an electrocatalysis aeration biological filter, which is used for solving a series of operation management problems caused by cathode scaling, such as reactor blockage, low current efficiency or hardened particle electrodes, and also increasing gas distribution hysteresis and nonuniform gas distribution in a backwashing process, so that local backwashing strength is insufficient to cause hardened filter materials, high operation pressure, unsmooth water passing and the like. The invention discloses a method for solving the problem of cathode scaling of an electrocatalysis biological aerated filter.
When the electro-catalytic biological aerated filter is subjected to back washing, the cathode and the anode of the electro-catalytic biological aerated filter are exchanged; and (4) carrying out gas washing, gas-water combined flushing and water washing on the reactor, and finally exchanging the cathode and the anode again. And in the back flushing stage, the negative plate becomes an anode, oxygen is generated on the surface, the anode and the washing force in the back flushing process are combined to form shearing force which is enough to drop the scaling substances, and the dropping substances flow out along with the back flushing water, so that the gas washing time is increased after the cathode and the anode are exchanged, and experimental data prove that the gas washing time is 5-8 min and the gas-water combined washing time is 7-10 min.
A large number of examples prove that the method provided by the invention can effectively solve the problem of cathode scaling of the electrocatalysis biological aerated filter.
The invention is characterized in that:
1. exchanging the cathode and the anode of the electrocatalytic biological aerated filter when backwashing the electrocatalytic biological aerated filter; carrying out air washing on the reactor for 5-8 minutes; flushing for 7-10 minutes by using gas-water combination; and (5) washing for 8-10 minutes, and finally exchanging the cathode and the anode again.
2. Each reactor is provided with a commutator for exchanging electrodes at its power supply for controlling the exchange process of the electrodes in the reactor.
3. The voltage intensity in the reaction system during back flushing is 30-100V.
4. The air washing time is 5-8 minutes during back washing, wherein the air washing strength is 12-16L/m2•s。
5. The gas-water combined flushing time is 7-10 minutes during back flushing, wherein the air flushing intensity is 12-16L/m2S; the water washing intensity is 4-6L/m2•s。
6. The washing time is 8-10 minutes during back washing, wherein the washing intensity is 4-6L/m2•s。
7. The back flushing interval is 2-3 days.
The beneficial effects of the invention compared with the prior art comprise:
1. the invention greatly accelerates the reaction rate of water treatment and can greatly reduce the cost.
2. No secondary pollution risk.
Drawings
FIG. 1 shows a schematic diagram of the reactor of embodiment 1.
FIG. 2 shows a schematic diagram of the reactor of embodiment 2.
FIG. 3 is a schematic view of the reactor of embodiment 3.
FIG. 4 is a schematic top view of the reactor of embodiment 3.
Detailed Description
The present invention will be described in further detail below with reference to practice, but the embodiments of the invention are not limited thereto.
Example 1
An electro-catalytic biological filter arranged longitudinally as shown in figure 1: sewage and wastewater enter from the water inlet (1), flow upwards through the supporting layer (2) and then enter the main body part of the electrocatalytic biological aerated filter: the granular biological filter material (4) becomes a microelectrode under the action of the electrode plate (5), so that the removal rate of the organic matters difficult to biodegrade is effectively improved. However, during the back flushing process, the scaling on the cathode plate often causes uneven water and gas distribution, the back flushing strength of a local area is too high, the water distribution often has hysteresis, the local area close to the air inlet end firstly distributes water and gas and even the strength far exceeds the designed strength, and the water and gas distribution of other areas has obvious hysteresis and extremely uneven strength. When the backwashing method provided by the invention is used, the current commutator (7) is used for exchanging the cathode and the anode during backwashing, and the reactor is subjected to gas washing for 5-8 minutes; flushing for 7-10 minutes by using gas-water combination; and (5) washing for 8-10 minutes, and finally exchanging the cathode and the anode again. A large number of experimental phenomena prove that after a reactor which is used for a long time uses the back washing method provided by the invention, the scale on the surface of the cathode is obviously reduced, and after the newly-built reactor uses the back washing method provided by the invention, the scale on the cathode is not obviously deposited.
Example 2
The electrocatalytic biological filter is transversely arranged as shown in the attached figure 2: sewage and wastewater enter from a water inlet (1), the water inlet is accompanied with an aeration device (2), and the sewage and wastewater flow upwards through a supporting layer (3) and then enter into a main body part of the electro-catalytic biological aerated filter: the granular biological filter material (4) becomes a microelectrode under the action of the electrode plates (5) and (6), so that the removal rate of the organic matters difficult to biodegrade is effectively improved. However, during the back flushing process, the reactor is blocked, the current efficiency is low and the particle electrode is hardened due to scaling on the cathode plate. When the backwashing method provided by the invention is used, the current commutator (8) is used for exchanging the cathode and the anode during backwashing, and the reactor is subjected to gas washing for 5-8 minutes; flushing for 7-10 minutes by using gas-water combination; and (5) washing for 8-10 minutes, and finally exchanging the cathode and the anode again. A large number of experimental phenomena prove that after a reactor which is used for a long time uses the back washing method provided by the invention, the scale on the surface of the cathode is obviously reduced, and after the newly-built reactor uses the back washing method provided by the invention, the scale on the cathode is not obviously deposited.
An annular expanded anode electro-catalytic biofilter, as shown in figures 3 and 4, the reactor being shown in figure 4 in a top view: sewage and wastewater enter from a water inlet (1), the water inlet is accompanied with an aeration device (2), and the sewage and wastewater flow upwards through a supporting layer (3) and then enter into a main body part of the electro-catalytic biological aerated filter: the granular biological filter material (4) becomes a microelectrode under the action of the electrode plates (5) and (6), so that the removal rate of the organic matters difficult to biodegrade is effectively improved. However, during the back washing process, the scale on the central cathode column causes excessive deposition to the lower part of the reactor, which causes the problems of reactor blockage, low current efficiency, hardening of particle electrodes, mixed bed of the support layer and the filter material layer, and the like. When the backwashing method provided by the invention is used, the current commutator (8) is used for exchanging the cathode and the anode during backwashing, and the reactor is subjected to gas washing for 5-8 minutes; flushing for 7-10 minutes by using gas-water combination; and (5) washing for 8-10 minutes, and finally exchanging the cathode and the anode again. A large number of experimental phenomena prove that after a reactor which is used for a long time uses the back washing method provided by the invention, the scale on the surface of the cathode is obviously reduced, and after the newly-built reactor uses the back washing method provided by the invention, the scale on the cathode is not obviously deposited.
The above description is provided for further details of the present invention with reference to specific embodiments, but it is not intended to limit the present invention to these examples. For those skilled in the art to which the invention pertains, numerous simplifications or substitutions may be made without departing from the spirit of the invention, which shall be deemed to be within the scope of the invention.
Claims (7)
1. A method for solving the problem of cathode scaling of an electrocatalysis biological aerated filter is characterized by comprising the following steps: when the electro-catalytic biological aerated filter is back-flushed, the cathode and the anode are exchanged, the air washing, the air-water combined washing and the water washing are carried out in sequence, and finally the cathode and the anode are exchanged again.
2. A method for solving the problem of cathode scaling in an electrocatalytic biological aerated filter according to claim 1, wherein the method comprises the following steps: the method for controlling the exchange process of the electrodes in the reactors is to arrange a commutator for exchanging the electrodes at the power supply of each reactor or to manually exchange the electrodes.
3. A method for solving the problem of cathode scaling in an electrocatalytic biological aerated filter according to claim 1, wherein the method comprises the following steps: the voltage intensity in the reaction system during back flushing is 30-100V.
4. A method for solving the problem of cathode scaling in an electrocatalytic biological aerated filter according to claim 1, wherein the method comprises the following steps: the air washing time is 5-8 minutes during back washing, wherein the air washing strength is 12-16L/m2•s。
5. A method for solving the problem of cathode scaling in an electrocatalytic biological aerated filter according to claim 1, wherein the method comprises the following steps: the gas-water combined flushing time is 7-10 minutes during back flushing, wherein the air flushing intensity is 12-16L/m2S; the water washing intensity is 4-6L/m2•s。
6. A method for solving the problem of cathode scaling in an electrocatalytic biological aerated filter according to claim 1, wherein the method comprises the following steps: the washing time is 8-10 minutes during back washing, wherein the washing intensity is 4-6L/m2•s。
7. A method for solving the problem of cathode scaling in an electrocatalytic biological aerated filter according to claim 1, wherein the method comprises the following steps: the back flushing interval is 2-3 days.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113003701A (en) * | 2021-02-08 | 2021-06-22 | 哈尔滨工业大学 | Lead-zinc mine tailing pond wastewater deep purification device with electric coupling biological filter |
| CN113354212A (en) * | 2021-06-29 | 2021-09-07 | 安徽科技学院 | Coupling biological membrane electrochemistry is with having waste water treatment device from inhaling filtration formula |
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| CN104817167A (en) * | 2015-04-13 | 2015-08-05 | 安徽华骐环保科技股份有限公司 | Water-level descending backwashing method for up-flow biological aerated filter |
| WO2017071116A1 (en) * | 2015-10-30 | 2017-05-04 | 中国石油化工股份有限公司 | Wastewater treatment method, wastewater treatment system, molecular sieve manufacturing method and manufacturing system |
| CN206188462U (en) * | 2016-10-27 | 2017-05-24 | 浙江大学苏州工业技术研究院 | Automatic waste water electrolysis processing apparatus of scale removal |
| CN211471172U (en) * | 2019-12-31 | 2020-09-11 | 天俱时工程科技集团有限公司 | Organic wastewater treatment system |
-
2020
- 2020-10-26 CN CN202011152135.1A patent/CN112299553A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104817167A (en) * | 2015-04-13 | 2015-08-05 | 安徽华骐环保科技股份有限公司 | Water-level descending backwashing method for up-flow biological aerated filter |
| WO2017071116A1 (en) * | 2015-10-30 | 2017-05-04 | 中国石油化工股份有限公司 | Wastewater treatment method, wastewater treatment system, molecular sieve manufacturing method and manufacturing system |
| CN206188462U (en) * | 2016-10-27 | 2017-05-24 | 浙江大学苏州工业技术研究院 | Automatic waste water electrolysis processing apparatus of scale removal |
| CN211471172U (en) * | 2019-12-31 | 2020-09-11 | 天俱时工程科技集团有限公司 | Organic wastewater treatment system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113003701A (en) * | 2021-02-08 | 2021-06-22 | 哈尔滨工业大学 | Lead-zinc mine tailing pond wastewater deep purification device with electric coupling biological filter |
| CN113354212A (en) * | 2021-06-29 | 2021-09-07 | 安徽科技学院 | Coupling biological membrane electrochemistry is with having waste water treatment device from inhaling filtration formula |
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Application publication date: 20210202 |