CN109761339B - Micro-ecological cycle switching type wastewater treatment microbial electrochemical system - Google Patents
Micro-ecological cycle switching type wastewater treatment microbial electrochemical system Download PDFInfo
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Abstract
The invention relates to a micro-ecological cycle switching type wastewater treatment microbial electrochemical system, which belongs to the technical field of wastewater treatment, wherein wastewater sequentially flows through a micro-ecological cycle switching type microbial fuel cell stack and a micro-ecological cycle switching type microbial electrolytic cell to obtain two-stage treatment; the method can change the valve switching mode and switching frequency of an external pipeline in time according to the water quality and water quantity characteristics of the treated wastewater and the change of load conditions, so that the micro-ecological cycle switching type microbial fuel cell and the micro-ecological cycle switching type microbial electrolytic cell respectively operate according to an anaerobic baffle plate reactor, an upflow anaerobic sludge bed reactor or a mode between the anaerobic baffle plate reactor and the upflow anaerobic sludge bed reactor to obtain the optimal coupling effect of wastewater treatment and energy (hydrogen and other chemical substances with additional values) recovery and utilization in the wastewater, has flexibility, and is favorable for the microbial electrochemical technology to truly realize engineering, industrialization and commercialization.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a coupled microbial electrochemical system for driving the electrolysis of a microbial periodic switching type microbial electrolytic cell by a microbial periodic switching type microbial fuel cell.
Background
The microbial electrochemical system is a biological wastewater treatment method, and combines an electron transfer system of microbes with a traditional electrochemical system to form a coupling system of microbes, reactants and electrodes, so that the advantages of biological methods, electrolytic ionization, electrochemical redox and other methods are integrated. The microbial electrochemical system mainly comprises a microbial fuel cell and a microbial electrolytic cell. The microbial fuel cell utilizes microbes as a catalyst to oxidize and decompose organic compounds in wastewater, generates current at the same time, converts chemical energy in the organic matters into electric energy, and has double functions of wastewater treatment and electric energy recovery. But the engineering application of the microbial fuel cell has the problems of small generated current, low wastewater treatment efficiency and the like. The microbial electrolytic cell is a new biological hydrogen production technology in recent years, organic wastewater can be converted into hydrogen and other chemical substances with added value only by applying external voltage of 0.3-1.0V, and the voltage of more than 1.8-2.0V is usually applied for hydrogen production by electrolyzing water. Therefore, the coupled microbial electrochemical system of the microbial electrolysis cell driven by the microbial fuel cell for wastewater treatment is receiving great attention in the environmental and energy fields. Factors affecting the performance of microbial fuel cells/microbial electrolysis cells include the microorganisms therein, the anode, the cathode, the membrane, the wastewater substrate composition and composition, and the design and structure of the microbial fuel cells/microbial electrolysis cells.
Through methods such as optimizing microorganisms, improving electrode materials and optimizing operation conditions, the efficiency of the microbial fuel cell/microbial electrolysis cell is greatly improved, but the aims of timely adjusting the micro-ecological environment in the microbial fuel cell/microbial electrolysis cell according to the characteristics of the quality and the quantity of the treated sewage and the change of load conditions, optimizing wastewater treatment and fully recovering and utilizing energy in the wastewater still cannot be fulfilled. Therefore, there is a need to organically combine the microbial fuel cell/microbial electrolysis cell with the conventional wastewater biological treatment technology, so as to truly realize engineering, industrialization and commercialization.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the microecological cycle switching type microbial electrochemical system for treating the wastewater can timely change the valve switching mode and the switching frequency of an external pipeline according to the change of the water quality and water quantity characteristics and the load condition of the treated wastewater, so that the microecological cycle switching type microbial fuel cell stack and the microecological cycle switching type microbial electrolytic cell respectively operate according to an anaerobic baffle plate reactor, an upflow anaerobic sludge bed reactor or a mode between the anaerobic baffle plate reactor and the upflow anaerobic sludge bed reactor to obtain the optimal coupling effect of wastewater treatment and recovery and utilization of energy sources (hydrogen and other chemical substances with additional values) in the wastewater, has flexibility, and is favorable for truly realizing engineering, industrialization and commercialization of a microbial electrochemical technology.
Microbial ecological cycle switching formula waste water treatment microorganism electrochemical system, characterized by: the microbial fuel cell system comprises a micro-ecological period switching type microbial fuel cell stack and a micro-ecological period switching type microbial electrolytic cell, wherein the micro-ecological period switching type microbial fuel cell stack and the micro-ecological period switching type microbial electrolytic cell are connected in series through resistors, and the electric energy generated by the micro-ecological period switching type microbial fuel cell stack is used for driving the micro-ecological period switching type microbial electrolytic cell;
the micro-ecological cycle switching type microbial electrolytic cell comprises a round pipe I, a round pipe II, an upper cover plate and a lower bottom plate, wherein the round pipe I is arranged inside the round pipe II and is coaxial with the round pipe II, an annular structure formed by the round pipe I and the round pipe II is divided into four compartments through four partition plates, a folded plate is arranged inside each compartment, a water inlet hole and a water outlet hole are formed in the outer side wall of each compartment, an air guide hole and an external circuit preformed hole are formed in the position, corresponding to each compartment, of the upper cover plate, and an emptying hole is formed in the lower bottom plate;
a graphite felt anode and a cathode are arranged in each compartment, and the graphite felt anode is connected with the anode of the microbial fuel cell stack in the micro-ecological cycle switching mode through a stainless steel wire;
the cathode comprises a stainless steel mesh I, a stainless steel mesh II and a stainless steel bracket, the geometric center positions of the stainless steel mesh I and the stainless steel mesh II are connected through the stainless steel bracket, the stainless steel bracket passes through an external circuit preformed hole arranged on an upper cover plate and is connected with the cathode of the microbial fuel cell stack with the micro-ecological cycle switching mode, and the stainless steel mesh I and the stainless steel mesh II are in non-contact with the partition plate, the circular tube I and the circular tube II;
twelve valves are arranged on the outer side wall of the circular tube II, three valves are arranged on each compartment, and the twelve valves are used for completing the micro-ecological periodic switching of the four compartments.
The water outlet of the up-flow area of each compartment is positioned on a side wall bus of the circular tube II which forms a 30-degree central angle with the side partition plate far away from the anode; the water inlet of each compartment downwash area is positioned on the angular bisector of the central angle corresponding to the cross section of the downwash area, and the position of the water outlet arranged on the side wall of each compartment is higher than that of the water inlet.
The center of the external circuit preformed hole is positioned on the midpoint of a radial line of a space between the circular tube I and the circular tube II, and the radial line of the space forms a 30-degree central angle with the side partition plate far away from the anode.
And the air guide holes in the upper cover plate are sealed by rubber rings and screw threads.
Stainless steel net I and stainless steel net II become 60 jiaos settings with the horizontal direction, the two interval is 0.5 times of I external diameter of pipe and II internal diameter differences of pipe, the projection of the two radial length is 0.8 times of I external diameter of pipe and II internal diameter differences of pipe, the two radial length is 1.6 times of I external diameter of pipe and II internal diameter differences of pipe, the two radial limit horizontal projection of one side of keeping away from the positive pole becomes 50 central angles with the radial limit horizontal projection of one side of being close to the positive pole, the two top edge is located below the free liquid level of each compartment, be 0.5 times of I external diameter of pipe and II internal diameter differences of pipe with the distance of free liquid level.
The current and voltage of each compartment electrolysis is supplied by the electric energy output by the micro-ecological cycle switching type microbial fuel cell stack, and the electrolysis of the four compartments is controlled by adjusting the resistors to synchronously run in parallel under the condition of stable voltage and stable current.
The wastewater treatment process comprises the steps that wastewater sequentially flows through a microbial ecological cycle switching type microbial fuel cell stack and a microbial ecological cycle switching type microbial electrolytic cell to obtain two-stage treatment; and the micro-ecological cycle switching type microbial fuel cell stack and the micro-ecological cycle switching type microbial electrolysis cell are operated according to the anaerobic baffle plate reactor, the upflow anaerobic sludge blanket reactor or a mode between the anaerobic baffle plate reactor and the upflow anaerobic sludge blanket reactor by changing the valve switching mode and the switching frequency of the external pipeline.
Through the design scheme, the invention can bring the following beneficial effects: a microbial electrochemical system for treating wastewater by using a micro-ecological cycle switching mode is characterized in that wastewater sequentially flows through a micro-ecological cycle switching mode microbial fuel cell stack and a micro-ecological cycle switching mode microbial electrolytic cell to obtain two-stage treatment; the method can change the valve switching mode and switching frequency of an external pipeline in time according to the water quality and water quantity characteristics of the treated wastewater and the change of load conditions, so that the micro-ecological cycle switching type microbial fuel cell stack and the micro-ecological cycle switching type microbial electrolytic cell respectively operate according to an anaerobic baffle plate reactor, an upflow anaerobic sludge bed reactor or a mode between the anaerobic baffle plate reactor and the upflow anaerobic sludge bed reactor to obtain the optimal coupling effect of wastewater treatment and recovery and utilization of energy (hydrogen and other chemical substances with additional values) in the wastewater, has high flexibility, and is favorable for truly realizing engineering, industrialization and commercialization by a microbial electrochemical technology.
Drawings
The invention is further described with reference to the following figures and detailed description:
FIG. 1 is a schematic diagram of the electrochemical system of micro-ecological cycle switching type wastewater treatment microorganisms of the present invention.
FIG. 2 is a schematic view of the main frame of the microbial electrolytic cell of the present invention.
FIG. 3 is a schematic top view of the cathode position of the micro-ecological cycle switching type microbial electrolysis cell of the present invention.
FIG. 4 is a schematic longitudinal sectional view of the cathode of the microbial electrolysis cell of the present invention.
In the figure, 1-a round pipe I, 2-a round pipe II, 3-an upper cover plate, 4-a lower bottom plate, 5-a partition plate, 6-a compartment, 7-a folded plate, 8-a water inlet hole, 9-a water outlet hole, 10-a stainless steel net I, 11-a stainless steel net II, 12-a stainless steel bracket, 13-an external circuit preformed hole and 14-an air guide hole.
Detailed Description
A micro-ecological cycle switching type wastewater treatment microbial electrochemical system, as shown in fig. 1, comprising a micro-ecological cycle switching type microbial fuel cell stack and a micro-ecological cycle switching type microbial electrolytic cell, wherein the electric energy generated by the micro-ecological cycle switching type microbial fuel cell stack is used for driving the micro-ecological cycle switching type microbial electrolytic cell to electrolyze; a resistor is connected between the two in series so as to collect and calculate the current in the circuit;
the micro-ecological cycle switching type microbial fuel cell stack is the prior art;
the micro-ecological cycle switching type microbial electrolysis cell is prepared from an organic glass material, and comprises a circular tube I1, a circular tube II 2, an upper cover plate 3 and a lower bottom plate 4 as shown in figures 2, 3 and 4, wherein the circular tube I1 is arranged inside the circular tube II 2 and is coaxial with the circular tube II 2, an annular structure formed by the circular tube I1 and the circular tube II 2 is uniformly divided into four compartments 6 through four partition plates 5, a folded plate 7 is arranged inside each compartment 6, a water inlet hole 8 and a water outlet hole 9 are arranged on the outer side wall of each compartment 6, an air guide hole 14 and an external circuit reserved hole 13 are arranged in the position, corresponding to each compartment 6, of the upper cover plate 3, each air guide reserved hole is sealed through a rubber ring and a screw thread, and an evacuation hole is arranged on the lower bottom plate 4;
the water outlet of the up-flow area of each compartment is positioned on a side wall bus of a circular tube TII which forms a 30-degree central angle with a side partition plate far away from the anode; the water inlet of each compartment downwash area is positioned on the angular bisector of the central angle corresponding to the cross section of the downwash area, and the position of the water outlet arranged on the side wall of each compartment is higher than the position of the water inlet.
A graphite felt anode and a cathode are arranged in each compartment 6, and the graphite felt anode is connected with the anode of the microbial fuel cell stack with the micro-ecological cycle switching mode through a stainless steel wire;
the cathode comprises a stainless steel mesh I10, a stainless steel mesh II 11 and a stainless steel bracket 12, the geometric center positions of the stainless steel mesh I10 and the stainless steel mesh II 11 are connected through the stainless steel bracket 12, the stainless steel bracket 12 passes through an external circuit preformed hole 13 arranged on an upper cover plate 9 to be connected with the cathode of the micro-ecological cycle switching type microbial fuel cell stack, and the stainless steel mesh I10 and the stainless steel mesh II 11 are in non-contact with the partition plate 5, the circular tube I1 and the circular tube II 2; the two identical stainless steel nets of the cathode which are overlapped up and down also have the function of separating the gas phase, the liquid phase and the solid phase of the effluent area of the upstream area of each compartment;
the two stainless steel nets are arranged at an angle of 60 degrees with the horizontal direction, the distance between the two stainless steel nets is 0.5 times of the difference value between the outer diameter of the circular tube I1 and the inner diameter of the circular tube II 2, the upper edges of the two stainless steel nets are positioned below the free liquid level of each compartment 6, the distance between the free liquid level and the free liquid level is 0.5 time of the difference value between the outer diameter of the round tube I1 and the inner diameter of the round tube II 2, the projection of the radial length of the free liquid level and the projection of the free liquid level are 0.8 time of the difference value between the outer diameter of the round tube 1I and the inner diameter of the round tube II 2, the radial length of the free liquid level and the projection of the radial length of the round tube I1 are 1.6 times of the difference value between the outer diameter of the round tube I1 and the inner diameter of the round tube II 2, the horizontal projection of the radial edges of one sides of the free liquid level and the radial length of the free liquid level and the radial length of the round tube II 2 are 5-degree central angles with a partition plate of one side of the partition plate of the partition chamber 6 which is far from the anode, namely, the horizontal projection of the radial edge of one side of the anode and the horizontal projection of the radial edge of the other side of the anode, which are far away from the anode, form a central angle of 50 degrees with the horizontal projection of the radial edge of one side of the anode, which is close to the anode; the two are not in contact with the compartment partition plate 5, the round pipe I1 and the round pipe II 2.
All be provided with three valve on every compartment 6, be provided with twelve valves on the lateral wall of pipe II, the little ecological cycle formula of four compartments is switched and is realized through the cycle formula of twelve valves.
The current and voltage of the electrolysis of each compartment 6 are supplied by the electric energy output by the micro-ecological cycle switching type microbial fuel cell stack, and the electrolysis of the four compartments can be ensured to synchronously run in parallel under the condition of stable voltage and stable current by adjusting the resistors.
The metallic connecting parts of the graphite felt anode and all parts of the cathode can also be replaced by nickel-based alloy.
The organic glass can be replaced by other materials which are not conductive and meet the mechanical requirements.
The wastewater treatment process comprises the following steps: wastewater firstly flows into the microbial ecological cycle switching type microbial fuel cell stack, and the effluent of the microbial fuel cell stack flows into the microbial ecological cycle switching type microbial electrolytic cell, so that the wastewater is treated in two stages, and a coupled microbial electrochemical system for driving the microbial ecological cycle switching type microbial electrolytic cell to electrolyze by the microbial ecological cycle switching type microbial fuel cell stack is formed; the valve switching mode and the switching frequency of an external pipeline can be timely changed according to the water quality and water quantity characteristics of the treated wastewater and the change of the load condition, so that the micro-ecological cycle switching type microbial fuel cell stack and the micro-ecological cycle switching type microbial electrolytic cell respectively operate according to an anaerobic baffle plate reactor, an upflow anaerobic sludge bed reactor or a mode between the anaerobic baffle plate reactor and the upflow anaerobic sludge bed reactor, the optimal coupling effect of wastewater treatment and recovery and utilization of energy (hydrogen and other chemical substances with additional values) in the wastewater is obtained, and the flexibility is realized.
Claims (7)
1. Microbial ecological cycle switching formula waste water treatment microorganism electrochemical system, characterized by: the microbial fuel cell system comprises a micro-ecological period switching type microbial fuel cell stack and a micro-ecological period switching type microbial electrolytic cell, wherein the micro-ecological period switching type microbial fuel cell stack and the micro-ecological period switching type microbial electrolytic cell are connected in series through resistors, and the electric energy generated by the micro-ecological period switching type microbial fuel cell stack is used for driving the micro-ecological period switching type microbial electrolytic cell to electrolyze;
the microbial electrolytic cell comprises a round pipe I (1), a round pipe II (2), an upper cover plate (3) and a lower bottom plate (4), wherein the round pipe I (1) is arranged inside the round pipe II (2) and is coaxial with the round pipe II (2), an annular structure formed by the round pipe I (1) and the round pipe II (2) is uniformly divided into four compartments (6) through four partition plates (5), a folded plate (7) is arranged inside each compartment (6), a water inlet hole (8) and a water outlet hole (9) are arranged on the outer side wall of each compartment (6), an air guide hole (14) and an external circuit preformed hole (13) are arranged on the upper cover plate (3) corresponding to the position of each compartment (6), and an evacuation hole is arranged on the lower bottom plate (4);
a graphite felt anode and a cathode are arranged in each compartment (6), and the graphite felt anode is connected with the anode of the microbial fuel cell stack with the micro-ecological cycle switching mode through a stainless steel wire;
the cathode comprises a stainless steel mesh I (10), a stainless steel mesh II (11) and a stainless steel bracket (12), the geometric center positions of the stainless steel mesh I (10) and the stainless steel mesh II (11) are connected through the stainless steel bracket (12), the stainless steel bracket (12) penetrates through an external circuit preformed hole (13) formed in an upper cover plate (3) to be connected with the cathode of the microbial fuel cell stack with the micro-ecological cycle switching mode, and the stainless steel mesh I (10) and the stainless steel mesh II (11) are in non-contact with a partition plate (5), a circular tube I (1) and a circular tube II (2);
twelve valves are arranged on the outer side wall of the round pipe II (2), three valves are arranged on each compartment (6), and the twelve valves are used for completing the micro-ecological periodic switching of the four compartments (6).
2. The micro-ecological cycle switching type microbial electrochemical system for wastewater treatment of claim 1, wherein: the water outlet hole (9) of the upstream area of each compartment (6) is positioned on a side wall generatrix of the circular tube II (2) which forms a 30-degree central angle with a side partition plate far away from the anode; the water inlet hole (8) of the downstream area of each compartment (6) is positioned on the angular bisector of the central angle corresponding to the cross section of the downstream area, and the position of the water outlet hole (9) arranged on the side wall of each compartment (6) is higher than that of the water inlet hole (8).
3. The micro-ecological cycle switching type microbial electrochemical system for wastewater treatment of claim 1, wherein: the center of the external circuit preformed hole (13) is positioned on the midpoint of a radial line of a space between the circular tube I (1) and the circular tube II (2) which form a 30-degree central angle with the side clapboard (5) far away from the anode.
4. The micro-ecological cycle switching type microbial electrochemical system for wastewater treatment of claim 1, wherein: and air vents (14) on the upper cover plate (3) are sealed by rubber rings and screw threads.
5. The micro-ecological cycle switching type microbial electrochemical system for wastewater treatment of claim 1, wherein: stainless steel net I (10) and stainless steel net II (11) become 60 jiaos with the horizontal direction and set up, the two interval is 0.5 times of pipe I (1) external diameter and pipe II (2) internal diameter difference, the projection of the two radial length is 0.8 times of pipe I (1) external diameter and pipe II (2) internal diameter difference, the two radial length is 1.6 times of pipe I (1) external diameter and pipe II (2) internal diameter difference, the radial limit horizontal projection of one side of the two keeping away from the positive pole becomes 50 central angles with the radial limit horizontal projection of one side that is close to the positive pole, the two upper edge is located below each compartment (6) free liquid level, be 0.5 times of pipe I (1) external diameter and pipe II (2) internal diameter difference with the distance of free liquid level.
6. The micro-ecological cycle switching type microbial electrochemical system for wastewater treatment of claim 1, wherein: the current and voltage of the electrolysis of each compartment (6) is supplied by the electric energy output by the micro-ecological cycle switching type microbial fuel cell stack, and the electrolysis of the four compartments is controlled by adjusting the resistors to synchronously run in parallel under the condition of stable voltage and stable current.
7. The micro-ecological cycle switching type microbial electrochemical system for wastewater treatment of claim 1, wherein: the wastewater treatment process comprises the following steps that wastewater sequentially flows through a microbial ecological cycle switching type microbial fuel cell stack and a microbial ecological cycle switching type microbial electrolytic cell to obtain two-stage treatment; and the micro-ecological cycle switching type microbial fuel cell stack and the micro-ecological cycle switching type microbial electrolysis cell are operated according to the anaerobic baffle plate reactor, the upflow anaerobic sludge blanket reactor or a mode between the anaerobic baffle plate reactor and the upflow anaerobic sludge blanket reactor by changing the valve switching mode and the switching frequency of the external pipeline.
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| CN102351310A (en) * | 2011-07-26 | 2012-02-15 | 西安交通大学 | Microbial electrochemical CO2 capture system |
| CN104310713A (en) * | 2014-11-03 | 2015-01-28 | 哈尔滨工业大学 | Difficult-to-degrade waste water treatment device reinforced by up-flow type anaerobic and biocatalysis electrolysis coupling |
| CN104812709A (en) * | 2012-12-02 | 2015-07-29 | 安克信水技术公司 | Method for imparting filtering capability in electrolytic cell for wastewater treatment |
| CN105449252A (en) * | 2015-12-31 | 2016-03-30 | 长春工程学院 | Micro ecological cycle switching type microbial fuel cell stack and power-generation technology thereof |
| CN108640417A (en) * | 2018-05-03 | 2018-10-12 | 安徽科技学院 | A kind of new method of electrochemistry and microbiological fuel cell combined treatment waste water from dyestuff |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351310A (en) * | 2011-07-26 | 2012-02-15 | 西安交通大学 | Microbial electrochemical CO2 capture system |
| CN104812709A (en) * | 2012-12-02 | 2015-07-29 | 安克信水技术公司 | Method for imparting filtering capability in electrolytic cell for wastewater treatment |
| CN104310713A (en) * | 2014-11-03 | 2015-01-28 | 哈尔滨工业大学 | Difficult-to-degrade waste water treatment device reinforced by up-flow type anaerobic and biocatalysis electrolysis coupling |
| CN105449252A (en) * | 2015-12-31 | 2016-03-30 | 长春工程学院 | Micro ecological cycle switching type microbial fuel cell stack and power-generation technology thereof |
| CN108640417A (en) * | 2018-05-03 | 2018-10-12 | 安徽科技学院 | A kind of new method of electrochemistry and microbiological fuel cell combined treatment waste water from dyestuff |
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