CN108467115B

CN108467115B - Bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor

Info

Publication number: CN108467115B
Application number: CN201810392276.7A
Authority: CN
Inventors: 王弘宇; 邓茜; 张伟; 何威良; 杨澈
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2020-09-08
Anticipated expiration: 2038-04-27
Also published as: CN108467115A

Abstract

The invention provides a bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor, which is characterized by comprising: the bioelectric catalytic pool surrounds first catch basin, contact oxidation pond, denitrification pond, second catch basin and the filtering ponds that bioelectric catalytic pool set up in order, and wherein, bioelectric catalytic pool is used for carrying out bioelectric catalytic treatment to the pollutant, contains: the electro-catalysis cell body of cavity column, the negative pole that sets up along the cell body inner wall, and the positive pole that is located the cell body middle part, be provided with the water inlet on the electro-catalysis cell body, first water catch bowl is linked together with the upper portion of biological electro-catalysis pond, the contact oxidation pond is linked together with the lower part of first water catch bowl, be used for carrying out biological contact oxidation degradation, carry out the nitration of nitrogen simultaneously, the bottom is equipped with a plurality of aeration heads, the denitrification pond is linked together with the upper portion of contact oxidation pond, be used for carrying out denitrification reaction, the second water catch bowl is linked together with the upper portion of denitrification pond, filtering ponds upper portion is equipped with the delivery.

Description

Bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor

Technical Field

The invention belongs to the field of printing and dyeing wastewater treatment devices, and particularly relates to a bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor.

Background

The printing and dyeing industry is a typical water consumption industry, 100-200 t of water is consumed for processing 1t of textiles, 80-90% of the water is changed into organic comprehensive wastewater through a production process, China is a large dye production country, and dyes produced throughout the year are more than 11 types of 500 varieties, the annual production capacity is about 30 ten thousand tons, and the dye production capacity accounts for more than 30% of the total dye production in the world.

At present, the treatment means of printing and dyeing wastewater at home and abroad mainly adopts a biological method assisted by a physical method and a chemical method, wherein a contact oxidation method is widely applied due to mature process and economic operation, but along with the development of the printing and dyeing industry towards photolysis resistance, oxidation resistance and biodegradation resistance, the biodegradability of the printing and dyeing wastewater is low due to the existence of difficultly degraded organic matters such as polyvinyl alcohol (PVA) slurry, rayon alkali, novel additives and the like in the wastewater, and the traditional contact oxidation method cannot reach the effluent water quality standard. The deep research on the bioelectrochemical system by scholars at home and abroad finds that the bioelectrochemical system is a breakthrough technology, combines the advantages of the anaerobic method and the electrochemical method, and is an effective and environment-friendly means for removing pollutants in the printing and dyeing wastewater by using the bioelectrochemical method, but the operation of a single pool is difficult to completely remove all pollutants in the printing and dyeing wastewater.

Therefore, how to develop an efficient and energy-saving printing and dyeing wastewater treatment technology becomes a problem to be solved by researchers at home and abroad.

Disclosure of Invention

The invention is carried out to solve the problems, and aims to provide a bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor, which removes refractory pollutants in printing and dyeing wastewater by bioelectrocatalysis, improves the biodegradability of the wastewater, leads the effluent to quickly meet the quality requirement of the biological contact oxidation influent water, and leads the subsequent contact oxidation and denitrification strengthening treatment to be operated efficiently.

In order to achieve the purpose, the invention adopts the following scheme:

the invention provides a bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor, which is characterized by comprising: the bioelectric catalytic pool surrounds first catch basin, contact oxidation pond, denitrification pond, second catch basin and the filtering ponds that bioelectric catalytic pool set up in order, and wherein, bioelectric catalytic pool is used for carrying out bioelectric catalytic treatment to the pollutant, decomposes the macromolecule organic matter, contains: the electro-catalysis cell body of cavity column, the negative pole that sets up along the cell body inner wall, and the positive pole that is located the cell body middle part, be provided with the water inlet on the electro-catalysis cell body, first catch basin is linked together with the upper portion of biological electro-catalysis pond, the contact oxidation pond is linked together with the lower part of first catch basin, be used for carrying out biological contact oxidation degradation, carry out the nitration of nitrogen simultaneously, the bottom is equipped with a plurality of aeration heads, the denitrification pond is linked together with the upper portion of contact oxidation pond, be used for carrying out denitrification reaction, the second catch basin is linked together with the upper portion of denitrification pond, the filtering ponds are used for carrying out mud-water separation, upper portion is equipped with the delivery port, all be equipped with the mud discharging mouth in the bottom of first catch basin, the contact oxidation pond, the denitrification pond, the.

Preferably, the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor can also have the following characteristics: the volume ratio of the bioelectrocatalysis tank, the contact oxidation tank, the denitrification tank, the filter tank, the first water collecting tank and the second water collecting tank is 1: 1-6: 1-3: 1-2: 0.5-1: 0.5 to 1.

Preferably, the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor can also have the following characteristics: the wall of the electro-catalysis cell body is provided with an outflow hole communicated with the first water collecting tank, and the proportional relation between the distance D1 from the outflow hole to the bottom of the cell and the depth L1 of the electro-catalysis cell body is D1: l1 is 16-19: 20.

preferably, the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor can also have the following characteristics: the first water collecting tank, the contact oxidation tank, the denitrification tank, the second water collecting tank and the filtering tank are sequentially connected and enclosed into a circular ring shape and are separated through the first partition plate, the second partition plate, the third partition plate, the fourth partition plate and the fifth partition plate in sequence, the lower portion of the first partition plate is provided with a rectangular first opening, the upper portion of the second partition plate is provided with a second opening, the upper portion of the third partition plate is provided with a third opening, and the lower portion of the fourth partition plate is provided with a rectangular fourth opening.

Preferably, the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor can also have the following characteristics: the area of the first open pore is 20-26 times that of the second open pore, the areas of the second open pore and the third open pore are equal, and the proportional relation between the distance D2 from the second open pore to the bottom surface of the second partition and the height L2 of the second partition is D2: and L2 is 15-19-20, the third opening is lower than the second opening, and the proportional relation between the distance from the third opening to the second opening and the height of the third partition board is 2-5: 40.

preferably, the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor can also have the following characteristics: the electro-catalysis cell body is hollow cylinder, and the water inlet setting is on the bottom surface of electro-catalysis cell body, and the electro-catalysis cell body setting is hugged closely to the negative pole, for any one in carbon fiber felt, stainless steel net, the gas diffusion electrode, for the microorganism provides the carrier, and the anode material is any one in high-purity graphite carbon-point, carbon fiber brush, the titanium base electrode, and the biological electro-catalysis cell still contains the lid that sets up at the electro-catalysis cell body top.

Preferably, the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor can also have the following characteristics: the contact oxidation tank is filled with contact oxidation fillers which are densely distributed in the tank in a curtain type structure and have the density of 0.4-0.8 m³Fillers/m³。

Preferably, the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor can also have the following characteristics: the volume ratio of the bioelectrocatalysis tank, the contact oxidation tank, the denitrification tank, the filter tank, the first water collecting tank and the second water collecting tank is 1: 3-5: 1-2: 1-2: 0.8-1: 0.8-1, the proportional relation between the distance D1 from the outflow hole to the bottom of the cell and the depth L1 of the electro-catalytic cell body is D1: l1 is 35-38: 40, the setting effect is better.

Preferably, the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor can also have the following characteristics: the portion of intaking contains: the water inlet device comprises a water inlet pool, a water inlet pipeline, a water inlet pump and a one-way valve, wherein the inlet of the water inlet pipeline is communicated with the water inlet pool, the outlet of the water inlet pipeline is communicated with a water inlet, the water inlet pump is arranged on the water inlet pipeline, and the one-way valve is arranged at the position of the water inlet.

Preferably, the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor can also comprise: an aeration section comprising: a plurality of aeration heads, an aeration device, an aeration pipeline with an air inlet connected with the aeration device and an air outlet connected with all the aeration heads, and a plurality of aeration valves arranged at each aeration head.

Action and Effect of the invention

The bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor has the following advantages:

1. the method adopts a bioelectrocatalysis method for pretreatment, aiming at the printing and dyeing wastewater which is difficult to biodegrade, the electrolysis principle is utilized to ensure that the wastewater meets the requirement of contact oxidation of the quality of inlet water, the existence of microorganisms reduces the overpotential of the reaction, saves the operation cost compared with an electrochemical method, and can simultaneously utilize an anode to treat other types of wastewater;

2. the gravity flow operation ensures that the bioelectrocatalysis coupling contact oxidation and denitrification reaction are carried out orderly, the water flow is ensured to flow through each tank body from bottom to top, only one pump is needed to be arranged between the water inlet tank and the reactor, no lifting pump is needed to be additionally arranged, the power consumption is reduced, the operation cost is reduced, and the operation management cost of a pump station is reduced;

3. the contact oxidation tank and the denitrification tank both adopt a biomembrane method, the combined filler is easy to generate membranes and change membranes, the impact resistance is strong, an attachment site is provided for microorganisms, the biomass is large, the food chain is complete, the sludge age is long, the sludge yield is low, and the burden of subsequent sludge treatment is reduced;

4. the water collecting tank is arranged between the tank bodies to equalize water quality and water quantity, so that the water flow is ensured to be fully contacted with the filler from bottom to top to form annular plug flow type water flow.

To sum up, the bioreactor provided by the invention integrates the functions of decoloring, denitrogenation and biological oxidation filtration separation of printing and dyeing wastewater, adopts gravity flow continuous operation, utilizes bioelectrochemistry to degrade macromolecular pollutants in the printing and dyeing wastewater, carries out biological contact oxidation degradation on organic pollutants in water by the contact oxidation tank, simultaneously removes nitrogen and organic matters in the water along with the nitrification and denitrification processes, and finishes solid-liquid separation of oxidized suspension by the filter tank.

Drawings

FIG. 1 is a schematic structural diagram of a bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor involved in the embodiment;

FIG. 2 is a top view of the integrated biological reactor of bioelectrocatalysis coupling contact oxidation denitrification filtration involved in the examples;

FIG. 3 is a schematic flow diagram of the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor involved in the example;

FIG. 4 is a schematic structural view of a cover body in the embodiment;

FIG. 5 is a schematic structural view of five separators in the embodiment;

FIG. 6 is a schematic structural view of a support plate according to an embodiment, wherein (a) is a front view and (b) is a side view.

Detailed Description

The bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor related to the invention is explained in detail below with reference to the attached drawings.

< example >

As shown in fig. 1 and 2, the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor 100 has: a bioelectrocatalysis tank 10, a first water collecting tank 20, a contact oxidation tank 30, a denitrification tank 40, a second water collecting tank 50, a filtering tank 60, a water inlet part 70, an aeration part 80 and a sludge discharge part 90.

The bioelectrocatalysis pool 10, the first water collecting pool 20, the contact oxidation pool 30, the denitrification pool 40, the second water collecting pool 50 and the filtering pool 60 are enclosed into a cylindrical structure, wherein the bioelectrocatalysis pool 10 is positioned in the middle part as an inner area, the inner diameter is 120mm, the wall thickness is 5mm, the height is 400mm, and the effective water depth is 370 mm; the first water collecting tank 20, the contact oxidation tank 30, the denitrification tank 40, the second water collecting tank 50 and the filtering tank 60 are sequentially arranged around the bioelectrocatalysis tank 10 (sequentially arranged along the counterclockwise direction as shown in fig. 2) as outer zones, and the occupied areas are 5: 2: 1: 1: 1, the inner diameter of the outer zone is 400mm, the wall thickness is 5mm, and the height is 400 mm.

The bioelectrocatalysis tank 10 is used for carrying out bioelectrocatalysis treatment on pollutants, decomposing macromolecular organic matters and improving the biodegradability of wastewater. In the embodiment, the external voltage of the bioelectrocatalysis cell 10 is generally 10-60 mA, and the hydraulic retention time is about 6 h. The bioelectrocatalysis cell 10 comprises an electrocatalysis cell body 11, a cover body 12, a cathode 13, an anode 14 and a water inlet 15.

The electro-catalytic cell 11 is hollow and cylindrical, and as shown in fig. 3, an outlet hole 11a is formed on a common side of the cell wall of the electro-catalytic cell 11 and the first water collecting tank 20, for allowing the electro-catalytic cell 11 to flow into the first water collecting tank 20. The diameter of the outflow hole 11a is 10mm, and the proportional relation between the distance D1 from the center of the outflow hole 11a to the bottom of the cell and the depth L1 of the electrocatalysis cell body 11 is D1: l1 is 16-19: 20. in this example, D1 is 370mm, and L1 is 400 mm.

As shown in fig. 1 and 4, a cover 12 is disposed on the top of the electrocatalytic tank 11, and 2 holes 12a are reserved on the cover 12 for placing an anode 14 and threading a lead.

As shown in FIG. 1, the cathode 13 is disposed closely to the inner wall of the electro-catalytic cell body 11 for providing a carrier for microorganisms, which may be a carbon fiber felt, a stainless steel mesh, a gas diffusion electrode, or the like. In this embodiment, the cathode 13 is a rectangular activated carbon fiber felt with dimensions of 360mm × 380 mm.

The anode 14 is located in the middle of the electro-catalytic cell body 11 and may be a high-purity graphite carbon rod, a carbon fiber brush, a titanium-based electrode, or the like. In this embodiment, the anode 14 is a high purity graphite carbon rod with a diameter of 6 × 350 mm.

The cathode 13 and the anode 14 are both connected to an external power supply B through a copper wire a, and all metal exposed portions are covered with an insulating epoxy resin.

The water inlet 15 is arranged on the bottom surface of the electro-catalytic cell body 11.

In the electro-catalytic cell 11, active microorganisms are used as a catalyst for the cathode 13, and specific cell membrane proteins, cell structures or soluble redox electron mediators in the body can realize the transfer of electrons between the solid electrode and the cell, drive the cathode 13 to react, reduce the overpotential of the reaction, enable the cathode 13 to reach the reduction potential of the target dye under the condition of small applied voltage, and decolorize and remove the target dye as an electron acceptor of the cathode 13, in this embodiment, methylene blue is used as the target dye. After the bioelectrocatalysis treatment, the organic matters which are difficult to biodegrade are oxidized and decomposed into substances with lower toxicity, so that the contact oxidation pond 30 is convenient to treat and utilize, and meanwhile, part of CODCr is removed.

Tested, C/N was varied from 2:1 to 1: 2, the COD removal rate is stabilized to be more than 70 percent, the average removal rate is 84.1 percent, the Methylene Blue (MB) removal rate is stabilized to be more than 60 percent, the average removal rate is 76.1 percent, the removal rate to nitrate nitrogen is stabilized to be more than 70 percent, the average removal rate to be 84.7 percent, and the removal rate to ammonia nitrogen is stabilized to be more than 10 percent, and the average removal rate to be 21.8 percent.

As shown in FIGS. 1 to 3, the first water collecting tank 20 is communicated with the upper part of the bioelectrocatalysis tank 10, plays a role in buffering, and can balance water quality and water quantity.

As shown in fig. 2, 3 and 5, the contact oxidation pond 30 is separated from the first water collecting pond 20 by a first partition plate 31 and communicated with the first water collecting pond through a first opening 31a provided at a lower portion of the first partition plate 31 for performing biological contact oxidation degradation while performing nitrification reaction of nitrogen. In this embodiment, the first partition plate 31 is a rectangular partition plate with a width of 130mm and a height of 400mm, and the first opening 31a is a rectangular hole with a length of 90mm and a width of 20mm, and is 20mm away from the bottom of the first partition plate 31.

As shown in fig. 1, a contact oxidation pond 30 is filled with a contact oxidation packing 32, and the contact oxidation packing 32 is densely packed in the pond as a curtain structure formed by connecting wire racks 33 in series and serves as a carrier for microorganisms. The contact oxidation filler 32 adopts a water plant-imitated braid type combined filler, and polypropylene and nylon materials are adopted, so that the silk bundles are uniformly dispersed in the sewage, the specific surface area is large, and the film is easy to grow and change. The density of the contact oxidation filler 32 is 0.4-0.8 m³Fillers/m³In this example, the density was 0.44m³Fillers/m³. Organic matters in the sewage are firstly adsorbed on the surface of a biological membrane inhabiting a large number of microorganisms and are contacted with the surfaces of microbial cells, small molecular organic matters can directly penetrate through cell walls to enter the microbial bodies, and large molecular organic matters are decomposed into small molecules under the action of extracellular enzyme-hydrolase and then are taken into the microbial bodies, so that the removal of the organic matters in the biological membrane is completed.

The contact oxidation filling 32 simulates the shape of natural aquatic weeds, so that the sludge is not easy to store, and the diameter of the pipe during oxygenation has the advantages of variability, no blockage and the like. The polypropylene and the vinylon are hydrophilic and oleophilic, have long service life, have good cutting effect and adsorption resistance and lifting effect on bubbles, obviously improve the retention time of air in water, have an oxygen storage function and have strong adsorption capacity; meanwhile, due to the impulse of water flow and air flow, the biological membrane on the filler is continuously updated, the biological activity is high, and the mass transfer efficiency is high. Therefore, compared with other fillers, the filler can improve the water purification efficiency by 70-80%. The curtain formula design, the installation of being convenient for need not steel bar support, has saved artifical and the material cost when having installed greatly, and is simple and convenient long service life.

As shown in FIGS. 1 to 3, the denitrification tank 40 is separated from the contact oxidation tank 30 by a second partition plate 41, and is communicated with the contact oxidation tank through a second opening 41a provided in an upper portion of the second partition plate 41, for performing denitrification reaction. The denitrification filler 42 is arranged in the denitrification tank 40, the denitrification filler 42 is similarly made of a waterweed-like braid combined filler, an anoxic environment is kept in the tank, facultative anaerobic microorganisms attached to a biological membrane perform denitrification on the wastewater, and nitrate nitrogen in the effluent of the contact oxidation tank 30 is converted into nitrogen gas, so that the nitrogen in the printing and dyeing wastewater is removed. In this embodiment, the second partition plate 41 is a rectangular partition plate with a width of 130mm and a height of 400mm, and the second opening 41a is a circular hole with a diameter of 10mm, and has a center 350mm away from the bottom of the second partition plate 41. The position of the second opening 41a at 350mm is to ensure that the volume ratio of the bioelectrocatalysis cell 10 to the contact oxidation cell 30 is 1: 4-6, in this embodiment, the volume ratio is 1: 4.4.

the second water collecting tank 50 is separated from the denitrification tank 40 by a third partition plate 51, and is communicated with the denitrification tank through a third opening 51a formed in the upper portion of the third partition plate 51. The second water collecting tank 50 is used for balancing the quality and quantity of water and ensuring that the wastewater flows through the tank body from bottom to top and is fully contacted with the filler. In this embodiment, the third partition plate 51 is a rectangular partition plate with a width of 130mm and a height of 400mm, the third opening 51a is a circular hole with a diameter of 10mm, and the center thereof is 320mm away from the bottom of the third partition plate 51, so that the volume ratio of the bioelectrocatalysis cell 10 to the denitrification cell 40 is set to 1: 1-2, the volume ratio in this embodiment is 1: 1.6.

the filtering tank 60 is separated from the second collecting tank 50 by a fourth partition 61, and is communicated with a fourth opening 61a provided at a lower portion of the fourth partition 61. As shown in fig. 1 to 3, the filtering tank 60 is used for separating mud and water, the upper part of the filtering tank is provided with a water outlet 62 connected with a water outlet pipe C, the height of the water outlet pipe C from the bottom is 270mm, and the distance between the water outlet pipe C and the upper surface of a filtering material 63 is 30-50 mm; the bottom of the filter tank 60 is provided with a back flushing hole 64 which is connected with a back flushing pipeline for back flushing. Graded quartz sand is adopted as a filter material 63 in the filter tank 60, so that the mud-water separation of the effluent of the denitrification tank 40 is completed, and suspended matters and liquid in the effluent are separated. In the embodiment, the height of the filtering layer is 150-180 mm, and the filtering layer is made of quartz sand with the thickness of 0.3-1 mm; a supporting layer is arranged below the filtering layer, the height of the supporting layer is 30-50 mm, and quartz sand with the thickness of 2-16 mm is selected; a supporting plate 65 as shown in FIG. 6 is placed at a position 30-50 mm away from the bottom for supporting the quartz sand of the supporting layer and the filtering layer. In addition, the filtering tank 60 and the first collecting tank 20 are separated by a fifth partition plate 66, and the fifth partition plate 66 is not provided with holes. Also, in the present embodiment, the fourth separator 61 and the fourth aperture 61a have the same size as the first separator 31 and the first aperture 31a, and the fifth separator 66 has the same size as the fourth separator 61.

Sludge discharge ports E are formed at the bottoms of the first water collecting tank 20, the contact oxidation tank 30, the denitrification tank 40, the second water collecting tank 50 and the filtering tank 60.

As shown in fig. 1, the water inlet portion 70 includes a water inlet tank 71, a water inlet pipe 72, a water inlet pump 73, and a check valve (not shown). The inlet of the water inlet pipeline 72 is communicated with the water inlet tank 71, and the outlet is communicated with the water inlet 15. A water inlet pump 73 is provided on the water inlet line 72. The check valve is arranged at the water inlet 15 and used for preventing the inflow water from flowing backwards.

The aeration section 80 includes a plurality of aeration heads 81, an aeration device 82, an aeration line 83, and a plurality of aeration valves (not shown). The aeration heads 81 are arranged at the bottom of the contact oxidation tank 30 and are changed from dense to sparse along the water flow direction, namely, the installation density of the aeration heads 81 is gradually reduced along the water flow direction so as to maintain the aerobic environment in the tank. The aeration device 82 is used for supplying air to the aeration head 81. The air inlet of the aeration pipeline 83 is connected with the aeration device 82, and the air outlet is connected with all aeration heads 81. An aeration valve is installed at each aeration head 81.

The sludge discharge portion 90 includes a sludge discharge line 91 and a sludge discharge valve (not shown). The sludge discharge valve is arranged at each sludge discharge port E and communicated with the sludge discharge pipeline 91 for discharging sludge and emptying.

Based on the above structure, the working procedure of the bioreactor 100 provided in this embodiment is as follows:

sewage enters the reactor from a water inlet 15 at the bottom of the bioelectrocatalysis tank 10 under the lifting action of a water inlet pump 73 in the water inlet tank 71 and flows through the tank body from bottom to top, electrochemically active microorganisms in the bioelectrocatalysis tank 10 are used as a cathode 13 catalyst to drive the cathode 13 to react and promote the anode 14 to oxidize, under the condition of external application of 20mA voltage, the cathode 13 reaches the reduction potential of target dye, the dye is used as an electron acceptor of the cathode 13 and is decolored and removed, organic matters which are difficult to biodegrade are oxidized and decomposed into substances with lower toxicity to meet the water inlet requirement of the contact oxidation tank 30, and meanwhile, part of COD (chemical oxygen demand) meets the water inlet requirement of the contact oxidation tank_CrIs removed.

Then, the waste water flows to the first collecting basin 20 of outer zone through the upper portion outflow hole 11a of the bioelectrochemical catalysis tank 10, flows into the contact oxidation tank 30 from the first opening hole 31a of the lower portion of the first clapboard 31, the contact oxidation filler 32 is arranged in the contact oxidation tank 30, and the advantages of fast film formation, good treatment effect, strong impact load resistance and the like are achieved.

Then, the effluent from the contact oxidation tank 30 flows out to the denitrification tank 40 through the second opening 41a on the second partition plate 41, the denitrification tank 40 is in an anoxic environment, denitrifying bacteria are attached to the denitrification filler 42, the wastewater is subjected to denitrification under the action of the biofilm to remove nitrogen elements, then enters the second water collecting tank 50 through the third opening 51a on the upper part of the third partition plate 51, then flows into the filter tank 60 through the fourth opening 61a on the lower part of the fourth partition plate 61, the solid-liquid separation of the suspended wastewater is completed under the filtering action of the filter material 63, and finally is discharged from the upper water outlet 62.

In this embodiment, the treatment of the printing and dyeing wastewater by the bioreactor 100 is divided into two stages:

the first stage is a reactor biofilm formation stage, in the initial stage, the culture and domestication of the bioelectric catalysis pool 10 are firstly carried out, the bioelectric catalysis pool 10 is subjected to biofilm formation by adopting a circulating biofilm formation method, nitrate nitrogen in and out water is measured, the removal rate of the nitrate nitrogen is over 80 percent, a layer of black and thick biofilm is attached to the surface of a cathode, and the biofilm formation can be considered to be completed after the stable operation for one week.

The second stage is a printing and dyeing wastewater treatment stage, and the printing and dyeing wastewater is treated under the conditions that the external current intensity is 20 mA-60 mA, the water inlet C/N is 2:1 and the initial concentration of the wastewater is 25 mg/L.

For example, the ammonia nitrogen concentration of the inlet water is 20-50 mg/L, the nitrate nitrogen concentration is 0-30 mg/L, the COD concentration is 100-140 mg/L, and the methylene blue concentration is 25 mg/L. Under the conditions that the external power supply B is 20mA and the influent organic carbon source is 50mg/L, the effluent MB is about 4mg/L and the removal rate is more than 76 percent; the ammonia nitrogen of the effluent is stabilized below 5mg/L, the nitrate nitrogen is stabilized below 8mg/L, and the COD is 50mg/L, thus meeting the factory discharge requirement. The hydraulic retention time of the intermediate bioelectrocatalysis tank 10 is 6h, and the hydraulic retention time of the whole device is 50.4 h.

The above embodiments are merely illustrative of the technical solutions of the present invention. The bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor is not limited to the structure described in the above embodiment, but is subject to the scope defined by the claims. Any modification or supplement or equivalent replacement made by a person skilled in the art on the basis of this embodiment is within the scope of the invention as claimed in the claims.

Claims

1. A bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor is characterized by comprising:

a bioelectric catalytic pool, a first water collecting pool, a contact oxidation pool, a denitrification pool, a second water collecting pool and a filtering pool which are arranged around the bioelectric catalytic pool in sequence,

wherein, the bioelectric catalytic cell is used for carrying out bioelectric catalytic treatment to the pollutant, decomposes macromolecule organic matter, contains: a hollow column-shaped electro-catalysis cell body, a cathode arranged along the inner wall of the electro-catalysis cell body, and an anode positioned in the middle of the electro-catalysis cell body, wherein the electro-catalysis cell body is provided with a water inlet,

the first water collecting tank is communicated with the upper part of the bioelectrocatalysis tank,

the contact oxidation tank is communicated with the lower part of the first water collecting tank and is used for carrying out biological contact oxidation degradation and nitration reaction of nitrogen, a plurality of aeration heads are arranged at the bottom,

the denitrification tank is communicated with the upper part of the contact oxidation tank and is used for carrying out denitrification reaction,

the second water collecting tank is communicated with the upper part of the denitrification tank,

the filtering tank is used for separating mud and water, the upper part of the filtering tank is provided with a water outlet,

the first water collecting tank, the contact oxidation tank, the denitrification tank, the second water collecting tank and the filtering tank are sequentially connected and encircled into a circular ring shape, and are sequentially separated by a first partition plate, a second partition plate, a third partition plate, a fourth partition plate and a fifth partition plate,

the lower part of the first clapboard is provided with a rectangular first opening,

the upper part of the second clapboard is provided with a second opening,

the upper part of the third clapboard is provided with a third opening,

and a rectangular fourth opening is formed in the lower part of the fourth partition plate.

2. The bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor according to claim 1, characterized in that:

wherein the volume ratio of the bioelectrocatalysis tank to the contact oxidation tank to the denitrification tank to the filtration tank to the first water collecting tank to the second water collecting tank is 1: 1-6: 1-3: 1-2: 0.5-1: 0.5 to 1.

3. The bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor according to claim 1, characterized in that:

the wall of the electro-catalysis cell body is provided with an outflow hole communicated with the first water collecting tank, and the proportional relation between the distance D1 from the outflow hole to the bottom of the cell and the depth L1 of the electro-catalysis cell body is D1: l1 is 16-19: 20.

4. the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor according to claim 1, characterized in that:

wherein the area of the first opening is 20-26 times of that of the second opening,

the second opening and the third opening have the same area,

the proportional relation between the distance D2 from the second opening to the bottom surface of the second partition and the height L2 of the second partition is D2: l2 is 15-19-20,

the third opening is lower than the second opening, and the ratio of the distance from the third opening to the second opening to the height of the third partition board is 2-5: 40.

5. the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor according to claim 1, characterized in that:

wherein the electro-catalysis cell body is hollow cylinder, the water inlet is arranged on the bottom surface of the electro-catalysis cell body,

the cathode is arranged close to the electro-catalytic cell body, is any one of a carbon fiber felt, a stainless steel mesh and a gas diffusion electrode, provides a carrier for microorganisms,

the anode material is any one of a high-purity graphite carbon rod, a carbon fiber brush and a titanium-based electrode,

the bioelectric catalytic pool also comprises a cover body arranged at the top of the electrocatalytic pool body.

6. The bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor according to claim 1, characterized in that:

wherein, the contact oxidation pond is filled with contact oxidation fillerThe curtain-type structure is densely distributed in the pool, and the density is 0.4-0.8 m³Fillers/m³。

7. The bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor according to claim 3, characterized in that:

wherein the volume ratio of the bioelectrocatalysis tank to the contact oxidation tank to the denitrification tank to the filtration tank to the first water collecting tank to the second water collecting tank is 1: 3-5: 1-2: 1-2: 0.8-1: 0.8 to 1 part by weight of a polymer,

the proportional relation between the distance D1 from the outflow hole to the bottom of the cell and the depth L1 of the electrocatalytic cell body is D1: l1 is 35-38: 40.

8. the bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor according to claim 1, further comprising:

the portion of intaking contains: the water inlet device comprises a water inlet pool, a water inlet pipeline, a water inlet pump and a one-way valve, wherein the inlet of the water inlet pool is communicated with the water inlet pool, the outlet of the water inlet pool is communicated with the water inlet, the water inlet pump is arranged on the water inlet pipeline, and the one-way valve is arranged at the position of the water inlet.

9. The bioelectrocatalysis coupling contact oxidation denitrification filtration integrated bioreactor according to claim 1, further comprising:

an aeration section comprising: the aeration device comprises a plurality of aeration heads, an aeration device, aeration pipelines, and a plurality of aeration valves, wherein the air inlet of the aeration device is connected with the aeration device, the air outlet of the aeration device is connected with all the aeration heads, and the aeration valves are arranged at each aeration head.