CN112142267A - Anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated wastewater treatment device and wastewater treatment method thereof - Google Patents
Anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated wastewater treatment device and wastewater treatment method thereof Download PDFInfo
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- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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Abstract
The invention discloses an anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated wastewater treatment device and a wastewater treatment method thereof, belonging to the technical field of biological wastewater treatment. The invention integrally stacks and assembles an anaerobic bioelectrochemical system (BES) and an aerobic Moving Bed Biofilm Reactor (MBBR) to be used as a pretreatment and subsequent treatment process of the refractory wastewater so as to degrade and mineralize refractory organic pollutants. The invention has the characteristics of simple design, convenient operation, practicability and the like, is more favorable for the amplification of the reactor, can adjust and control the quality of different inlet water, the wastewater firstly passes through the cathode region of the bioelectrochemical module to generate the biocatalytic reduction reaction and the toxicity removal, and the intermediate metabolite is a nontoxic or low-toxic organic matter, can realize the complete decomposition and utilization in the subsequent moving bed biomembrane module stage, thereby realizing the deep enhanced treatment of the refractory toxic organic wastewater.
Description
Technical Field
The invention relates to an anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated wastewater treatment device and a wastewater treatment method thereof, belonging to the technical field of biological wastewater treatment.
Background
The biological wastewater treatment technology has the advantages of low cost and high efficiency, adopts a proper pretreatment technology for the biological treatment of the wastewater difficult to degrade, improves the biodegradability of the wastewater, then enters a conventional biochemical treatment technology for further treatment, finally realizes the standard-reaching discharge of the wastewater, and is an effective technical mode. Among them, the anaerobic-aerobic combined biological process has been widely used for the treatment of refractory wastewater. However, in the anaerobic-aerobic combined process, in order to realize the efficient and rapid biodegradation and mineralization of the organic wastewater and aromatic metabolites thereof which are difficult to degrade, some problems and challenges still need to be further improved and optimized, such as (1) incomplete degradation in the anaerobic process and low pretreatment efficiency; (2) in the aerobic process, intermediate metabolite residues exist and are difficult to mineralize further.
Disclosure of Invention
Aiming at the problems, the invention couples the bioelectrochemical technology with the existing wastewater biological treatment technology, and integrally stacks and assembles an anaerobic bioelectrochemical system (BES) and an aerobic Moving Bed Biofilm Reactor (MBBR) to be used as a pretreatment and subsequent treatment process of the refractory wastewater so as to realize the degradation and mineralization of refractory organic pollutants.
An anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated wastewater treatment device is formed by stacking a water distributor 1, a first module 2, a second module 3 and a third module 4 from bottom to top in sequence, wherein the first module 2 and the second module 3 are bioelectrochemical modules, and the third module 4 is a moving bed biofilm module; the first module 2, the second module 3 and the third module 4 are connected through flanges, and rubber pads are arranged among the flanges to ensure the tightness of each module; the water distributor 1 is communicated with the first module 2, water inlets are formed in the bottoms of the first module 2, the second module 3 and the third module 4, water outlets are formed in the tops of the first module 2, the second module 3 and the third module 4, the water inlets and the water outlets of adjacent modules are communicated through a guide pipe, and sampling ports are formed in the first module 2, the second module 3 and the third module 4;
the bioelectrochemical module is of a sleeve structure arranged around the electrodes and comprises an inner cylinder and an outer cylinder, wherein the inner part of the inner cylinder is an anode chamber for placing anode materials; a chamber formed between the inner cylinder and the outer cylinder is a cathode chamber for placing cathode materials; the anode chamber and the cathode chamber are separated by a cation exchange membrane, the cation exchange membrane is positioned on the outer wall of the inner cylinder, and holes are distributed on the wall of the inner cylinder; the anode material and the cathode material are connected with a power supply and an external resistor through leads to form a closed loop;
the moving bed biomembrane module is characterized in that a barrel body of the moving bed biomembrane module is filled with porous plastic suspended biological carriers, a microporous aeration pipe 5 is arranged at the bottom of the barrel body, a dissolved oxygen probe is inserted into the barrel body, and the concentration of dissolved oxygen in the moving bed biomembrane module is monitored.
Further, the cathode material and the anode material of the bioelectrochemical module are carbon brushes which are arranged in a surrounding manner.
In a further limitation, the anode material is carbon fiber, carbon particles, graphite particles, carbon felt, carbon cloth, stainless steel mesh, foamed nickel and modified materials thereof.
In a further limitation, the cathode material is carbon fiber, carbon particles, graphite particles, carbon felt, carbon cloth, stainless steel mesh, foamed nickel and modified materials thereof.
Further, the positions of the cathode chamber and the anode chamber of the bioelectrochemical module can be exchanged.
Further limited, the porous plastic suspended biological carrier is polyethylene, polyvinyl chloride, polypropylene and modified materials thereof.
Further limited, the porous plastic suspended biological carrier is an annular, columnar, built-in, porous rotating spherical or polyhedral hollow sphere.
The method for treating the wastewater by using the anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated wastewater treatment device comprises the following specific steps of:
under the condition of external voltage, the wastewater flows through the first module 2, the second module 3 and the third module 4 in sequence by water distribution of the water distributor and then flows out from a water outlet of the third module 4.
Further, the concentration of dissolved oxygen in the wastewater in the third module 4 is kept between 2 and 3mg L-1。
Further, the voltage of the first module 2 and the second module 3 is 0.3-0.7V, and the external resistance is 20 Ω.
The invention has the following beneficial effects: the invention combines the bioelectrochemical technology and the biological wastewater treatment process, and the reactor adopts a mode of stacking and assembling functional modules, thereby developing a new device and a new method for the enhanced treatment of the refractory organic pollutants. The invention integrates the advantages of bioelectrochemistry and moving bed biofilm reactors, the bioelectrochemical module reduces the distance between the anode and the cathode, reduces the internal resistance of the reactor, improves the pretreatment performance of the reactor, and improves the biodegradability of refractory wastewater; the moving bed biofilm module can fully exert the combined action of the activated sludge and the biofilm, has a promoting effect on the further degradation of the pollutants, and is favorable for strengthening the pollutant degradation and the advanced treatment of the wastewater. The invention also has the characteristics of simple design, convenient operation, practicability and the like, is more favorable for the amplification of the reactor, can adjust and control the quality of different inlet water, the wastewater firstly passes through the cathode region of the bioelectrochemical module to generate the biocatalytic reduction reaction and the toxicity removal, and the intermediate metabolite is a nontoxic or low-toxic organic matter, can realize the complete decomposition and utilization in the subsequent moving bed biomembrane module stage, thereby realizing the deep enhanced treatment of the refractory toxic organic wastewater. The stacking number of the bioelectrochemical modules and the moving bed biofilm modules which are stacked and assembled by the functional modules can be adjusted according to actual operation.
Drawings
FIG. 1 is a schematic diagram of an integrated process unit for anaerobic bioelectrochemistry-aerobic moving bed biofilm;
FIG. 2 is a graph showing the concentration changes of the dye and its products in each module of the process for treating azo dye wastewater by the anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated process device in example 1;
FIG. 3 is a graph showing the contribution of each module to the dye removal rate and COD removal rate in the azo dye wastewater treatment process by the anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated process device in example 1.
In the figure, 1 is a water distributor, 2 is a first module, 2, 3 is a second module, 4 is a third module, and 5 is a microporous aeration pipe.
Detailed Description
The experimental procedures used in the following examples are conventional unless otherwise specified. The materials, reagents, methods and apparatus used, unless otherwise specified, are conventional in the art and are commercially available to those skilled in the art.
Example 1:
as shown in fig. 1, the anaerobic bioelectrochemical-aerobic moving bed biofilm integrated wastewater treatment apparatus according to the present embodiment has the following structure:
the device is formed by sequentially stacking a water distributor 1, a first module 2, a second module 3 and a third module 4 from bottom to top, wherein the first module 2 and the second module 3 are bioelectrochemical modules, and the third module 4 is a moving bed biofilm module; the first module 2, the second module 3 and the third module 4 are connected through flanges, and rubber pads are arranged among the flanges to ensure the tightness of each module; the water distributor 1 is communicated with the first module 2, the bottoms of the first module 2, the second module 3 and the third module 4 are respectively provided with a water inlet hole, the tops of the first module 2, the second module 3 and the third module 4 are respectively provided with a water outlet hole, the water inlet holes and the water outlet holes of the adjacent modules are communicated through a guide pipe, and the first module 2, the second module 3 and the third module 4 are respectively provided with a sampling port.
The bioelectrochemical module is of a sleeve structure arranged around the electrodes and comprises an inner cylinder and an outer cylinder, wherein an anode chamber is arranged inside the inner cylinder and is used for placing anode materials, and the anode materials are carbon brushes; a chamber formed between the inner cylinder and the outer cylinder is a cathode chamber, and a cathode material is placed in the chamber, wherein the cathode material is a carbon brush; the anode chamber and the cathode chamber are separated by a cation exchange membrane, the cation exchange membrane is positioned on the outer wall of the inner cylinder, and holes are distributed on the wall of the inner cylinder; the anode material and the cathode material are connected with a power supply and an external resistor through leads to form a closed loop, wherein the power supply voltage is 0.5V, and the external resistor is 20 omega. The anode substrate is glucose which is used as a carbon source and an electron donor of the anode; the cathode target dye is acid orange II which is used as a target pollutant and an electron acceptor of the cathode, and glucose is used as a co-matrix to provide a carbon source for the microorganisms.
The barrel of the moving bed biomembrane module is filled with 40 percent of porous plastic suspended biological carriers, the bottom of the barrel is provided with a microporous aeration pipe 5, and an electromagnetic air pump is adopted to provide air in the reaction process so as to keep the concentration of dissolved oxygen at 2-3mg L-1. And a dissolved oxygen probe is inserted into the cylinder to monitor the concentration of dissolved oxygen in the moving bed biomembrane module. The water is fed from the water distributor 1 by a peristaltic pump and runs in a continuous flow mode, and the wastewater flows through a bioelectrochemical stage and a moving bed biofilm stage in sequence, namely a first module 2, a second module 3 and a third module 4. Wherein the concentration of the azo dye acid orange II is 100mg L-1Glucose concentration of 1000mg L-1The hydraulic retention time is 12h, and the pollutant load is 200g m-3d-1。
The decolorization efficiency, the product change and the COD removal efficiency in the first module 2, the second module 3 and the third module 4 are examined, as shown in fig. 2 and 3, and the results show that the gradient degradation and the stage removal of pollutants can be realized in the integrated process device of the anaerobic bioelectrochemistry-aerobic moving bed and the biofilm, the dye removal rate is 96.4%, the product removal rate is 97.0% and the COD removal rate is 87.7%.
As can be seen from the decolorizing performance, the dye concentration gradually decreased, the contribution of each of the first module 2, the second module 3 and the third module 4 was 81.9%, 13.6% and 0.9%, respectively, and the total decolorizing ratio was 96.4%. This indicates that the reductive decolorization of the azo dye is caused by the first module 2 and the second module 3 (i.e., the two-stage anaerobic bio-electrochemical module), while the third module 4 (i.e., the aerobic moving bed biofilm module) does not function substantially.
As shown in fig. 2, it can be seen from the change in the concentration of sulfanilic acid, which is a decoloration product, of each of the first module 2, the second module 3, and the third module 4 having a sulfanilic acid concentration of 37.9mg L-1，43.5mg L-1And 1.3mg L-1. The accumulation of the product sulfanilic acid can be realized in the first module 2 and the second module 3 (namely the two-stage anaerobic bio-electrochemical module), and the product concentration reaches 43.5mg L-1The conversion rate of formation is 92 percent), the further degradation of the product can be generated in the third module 4, namely the aerobic moving bed biomembrane module), and the concentration of sulfanilic acid is reduced to 1.3mg L-1. This shows that the bioelectrochemistry stage has pretreatment effect on azo dyes, can strengthen the reduction and decoloration of dyes, and the moving bed biomembrane stage has subsequent removal effect on decoloration products.
As shown in fig. 3, it can be seen from the COD removal results that the contributions of each of the first module 2, the second module 3 and the third module 4 are 28.0%, 17.3% and 42.5%, respectively, and the total COD removal rate is 87.7%. This shows that the removal of COD in the first module 2 and the second module 3 is mainly caused by the degradation of substrate glucose and the volatile acid degradation of metabolites thereof, and the aerobic conditions in the third module 4 can promote the further mineralization removal of decolorized products, and have an important role in the removal of COD, thereby realizing the deep treatment of dye.
In conclusion, in the integrated process device of the anaerobic bioelectrochemistry-aerobic moving bed biomembrane, when the wastewater flows through the reactor, in the stage of the anaerobic bioelectrochemistry module, the azo dye acid orange is subjected to azo bond breaking, reduction and decoloration to generate the sulfanilic acid and the 1-amino-2-naphthol, and the two products are easy to be subjected to aerobic treatment, so that the reinforced treatment of the refractory wastewater is realized, and the subsequent further advanced treatment is facilitated; in the stage of the aerobic moving bed biomembrane, the intermediate product can be further oxidized under aerobic conditions to generate a series of aromatic amine compounds, the compounds are subjected to aromatic ring cracking to generate short-chain fatty acids, and finally decomposed to generate carbon dioxide and water, so that the decoloration and mineralization of the dye are finally realized. The experiment can realize the treatment of the organic wastewater difficult to degrade, has the advantages of high efficiency, high speed, good stability and easy amplification and application, and provides theoretical basis and technical basis for guiding the application of wastewater treatment.
Claims (10)
1. An anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated wastewater treatment device is characterized by being formed by stacking a water distributor (1), a first module (2), a second module (3) and a third module (4) from bottom to top in sequence, wherein the first module (2) and the second module (3) are bioelectrochemical modules, and the third module (4) is a moving bed biofilm module; the first module (2), the second module (3) and the third module (4) are connected through flanges, and rubber mats are arranged among the flanges to ensure the tightness of the modules; the water distributor (1) is communicated with the first module (2), water inlets are formed in the bottoms of the first module (2), the second module (3) and the third module (4), water outlets are formed in the tops of the first module (2), the second module (3) and the third module (4), the water inlets and the water outlets of adjacent modules are communicated through a guide pipe, and sampling ports are formed in the first module (2), the second module (3) and the third module (4);
the bioelectrochemical module is of a sleeve structure arranged around the electrodes and comprises an inner cylinder and an outer cylinder, wherein the inner part of the inner cylinder is an anode chamber for placing anode materials; a chamber formed between the inner cylinder and the outer cylinder is a cathode chamber for placing cathode materials; the anode chamber and the cathode chamber are separated by a cation exchange membrane, the cation exchange membrane is positioned on the outer wall of the inner cylinder, and holes are distributed on the wall of the inner cylinder; the anode material and the cathode material are connected with a power supply and an external resistor through leads to form a closed loop;
the moving bed biomembrane module is characterized in that a barrel body of the moving bed biomembrane module is filled with porous plastic suspended biological carriers, a microporous aeration pipe 5 is arranged at the bottom of the barrel body, a dissolved oxygen probe is inserted into the barrel body, and the concentration of dissolved oxygen in the moving bed biomembrane module is monitored.
2. The anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated wastewater treatment device according to claim 1, wherein the cathode material and the anode material of the bioelectrochemical module are carbon brushes arranged in a surrounding manner.
3. The integrated wastewater treatment device of anaerobic bioelectrochemistry-aerobic moving bed biofilm according to claim 2, wherein the anode material is carbon fiber, carbon particles, graphite particles, carbon felt, carbon cloth, stainless steel mesh or foamed nickel.
4. The integrated wastewater treatment device of anaerobic bioelectrochemistry-aerobic moving bed biofilm according to claim 2, wherein the cathode material is carbon fiber, carbon particles, graphite particles, carbon felt, carbon cloth, stainless steel mesh or foamed nickel.
5. The integrated wastewater treatment device of anaerobic bioelectrochemistry-aerobic moving bed biofilm according to claim 1, wherein the positions of the cathode chamber and the anode chamber of the bioelectrochemical module can be changed.
6. The integrated anaerobic bioelectrochemical-aerobic moving bed biofilm wastewater treatment device according to claim 1, wherein the porous plastic suspended biological carrier is polyethylene, polyvinyl chloride or polypropylene.
7. The anaerobic bioelectrochemistry-aerobic moving bed biofilm integrated wastewater treatment device according to claim 1 or 6, wherein the porous plastic suspended biological carriers are ring-shaped, columnar, built-in, porous rotating spherical or polyhedral hollow spheres.
8. The method for treating wastewater of an anaerobic bioelectrochemical-aerobic moving bed biofilm integrated wastewater treatment device according to claim 1, which comprises the following specific steps:
under the condition of external voltage, wastewater flows through the first module (2), the second module (3) and the third module (4) in sequence by water distribution of the water distributor and then flows out from a water outlet of the third module (4).
9. The method for wastewater treatment of an anaerobic bioelectrochemical-aerobic moving bed biofilm integrated wastewater treatment plant according to claim 8, wherein the dissolved oxygen concentration of the wastewater in the third module (4) is maintained at 2-3mg L-1。
10. The method for wastewater treatment of an anaerobic bioelectrochemical-aerobic moving bed biofilm integrated wastewater treatment device according to claim 8, wherein the voltage of the first module (2) and the second module (3) is 0.3 to 0.7V, and the external resistance is 20 Ω.
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| CN115784378A (en) * | 2022-10-31 | 2023-03-14 | 重庆大学 | Building block type conductive separation membrane system device and method for shale gas back drainage |
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