Anaerobic wastewater treatment equipment

Abstract

The invention discloses anaerobic wastewater treatment equipment which comprises a shell, the interior of the shell is divided into five areas, namely an area A, an area B, an area C, an area D and an area E, and water flows through the five areas in sequence; a first water inlet is formed in the lower portion of the outer side wall of the area A, a plurality of first filler devices are arranged in the area B and the area C, a second filler device is arranged in the area D, filler in the second filler device is sponge iron particles, and the area D is an oxygen removal area. A plurality of third filler devices are arranged in the area E, water in the area E flows upwards, and a water outlet is formed in the upper portion of the outer side wall of the area E; the first filling device and the third filling device are the same in structure, each filling device comprises a vertically-arranged perforated pipe and fiber bundle clusters bound on the perforated pipe at intervals in the length direction, and the fiber bundle clusters are all immersed in water. The anaerobic wastewater treatment equipment works in anoxic and anaerobic states, and the removal efficiency of nitrate nitrogen and organic carbon in wastewater is synchronously improved.

Description

[0001] This application is a divisional application of the application with the application date of July 17, 2024, the application number of 2024109565203, and the title of "a multifunctional integrated wastewater treatment device". TECHNICAL FIELD

[0002] The present application relates to a multifunctional integrated wastewater treatment device, belonging to the field of sewage environmental protection treatment. BACKGROUND

[0003] With the rapid development of industrialization and urbanization in China, the discharge of industrial wastewater and domestic sewage is also rapidly increasing, and the task of sewage treatment is becoming more and more heavy. Moreover, the promulgation of the Water Pollution Prevention Law and the Water Ten Provisions has put forward higher requirements for the discharge standards of wastewater. Not only higher requirements are put forward for organic pollutants in water such as COD and BOD, but also higher requirements are put forward for rich elements in water such as ammonia nitrogen, total nitrogen, total phosphorus, etc. According to the existence form of pollutants in wastewater, physical methods of sewage can be roughly divided into physical treatment method, chemical treatment method and biological treatment method. Among them, biological treatment method usually uses microorganisms in water to remove organic pollutants in wastewater in colloidal and dissolved state as secondary treatment. According to the different metabolic forms of microorganisms, biological treatment method is usually divided into aerobic biological treatment and anaerobic biological treatment, which can be further divided into activated sludge method and biofilm method. They all focus on the removal of organic pollutants in water. Subsequently, anaerobic and aerobic combined processes such as A1-O, A2-O, A1-A2-O, etc. have been developed to remove nitrogen and phosphorus. The existing sewage treatment equipment has the following shortcomings: first, multiple independent devices need to be used in series, which has high investment cost. Because multiple devices are needed, the occupied area is large, sludge backflow is usually required, and the operation cost is high. Second, the operation mode is not flexible. Once the function is determined, it is almost impossible to change during subsequent operation, and the adjustability is poor. Third, in the process of treating wastewater by biofilm method, the filler used as biofilm carrier has the problems of easy cementation, easy falling off, limited thickness of biofilm (mostly limited to about 2mm), and poor mass transfer effect inside and outside the membrane, which affects the wastewater treatment effect and other problems. SUMMARY

[0004] In view of the problems existing in the prior art, the present application provides a multifunctional integrated wastewater treatment device, which aims to solve at least one of the problems of low integration, inflexible operation function, and poor mass transfer effect inside and outside the biofilm in the existing wastewater treatment equipment technology.

[0005] The technical scheme of the present application is as follows: An integrated wastewater treatment device comprises a shell, a first partition plate, a second partition plate, a third partition plate and a fourth partition plate are arranged in the shell in sequence and parallel, the four partition plates divide the shell into five areas, which are area A, area B, area C, area D and area E, and each area is provided with an openable and closable exhaust hole; the first and third partition plates are fixedly connected with the bottom plate of the shell, and a certain space exists between the top of the first and third partition plates and the top plate of the shell; the second and fourth partition plates are fixedly connected with the top plate of the shell, and a certain space exists between the bottom of the second and fourth partition plates and the bottom plate of the shell; a first water inlet is arranged at the lower part of the outer side wall of the area A, and the water in the area A flows upward; a first filler device is arranged in the area B and the area C, the water in the area B flows downward, and the water in the area C flows upward; the water in the area D flows downward; a third filler device is arranged in the area E, the water in the area E flows upward, a water outlet is arranged at the upper part of the outer side wall of the area E, and the height of the water outlet is lower than the height of the third partition plate, and the height of the third partition plate is lower than the height of the first partition plate.

[0006] Further, the area A is an aeration area, and a first aeration device is arranged at the bottom of the area A.

[0007] Further, the first filler device comprises a plurality of porous pipes arranged vertically, and fiber bundles are bound on the porous pipes in the length direction and are fully immersed in water.

[0008] Further, the fiber type of the fiber bundles in the first filler device is one or a combination of glass fiber, basalt fiber and aluminum silicate fiber.

[0009] Further, the area D is a deoxidation area, and a second filler device is arranged in the area D, and the filler in the second filler device is sponge iron particles.

[0010] Further, the structure of the third filler device is the same as that of the first filler device, and the fiber type of the fiber bundles in the third filler device is one or a combination of modified glass fiber, basalt fiber and aluminum silicate fiber.

[0011] Further, movable plates are arranged at the lower parts of the second and fourth partition plates, and the areas on both sides of the partition plates can be communicated or isolated by opening or closing the movable plates.

[0012] Further, sedimentation tanks are arranged at the bottoms of the areas B and C, and sludge discharge pipes are arranged on the sedimentation tanks.

[0013] Further, a second water inlet is further arranged at the bottom of the area E.

[0014] Further, a second aeration device is further arranged at the bottom of the area E.

[0015] Further, the volume of the B region and the C region is similar, and the volume of the E region is more than twice the volume of the B region or the C region.

[0016] Further, the height of the first partition plate, the third partition plate and the water outlet gradually decreases, which is beneficial to the gravity flow of water.

[0017] Further, a dissolved oxygen concentration sensor is arranged in the upper water of the B region and the C region, and a dissolved oxygen concentration sensor is arranged in the lower water of the E region.

[0018] Further, a nitrate concentration sensor and an ammonia nitrogen concentration sensor are arranged in the upper water outlet of the C region.

[0019] Further, a pH sensor is arranged in each of the A region, the B region, the C region and the E region to detect the pH value.

[0020] The dissolved oxygen concentration sensor, the nitrate concentration sensor, the ammonia nitrogen concentration sensor and the aeration device are electrically connected with the controller.

[0021] Basic principle and beneficial effect: the integrated wastewater treatment equipment disclosed by the application divides the shell into five regions, i.e., an A region, a B region, a C region, a D region and an E region, by four partition plates, the five regions are integrated together, the structure is compact, wastewater flows through the five regions in sequence, and acid or alkali can be added to each region according to the need to adjust the pH value; the A region is a main water inlet region, the B region, the C region and the E region are all filled with fiber bundle fillers, the fiber fillers are stretched in water, can cut the flowing water in multiple layers, the surface of the fiber fillers is covered with a biological membrane, the thickness of the biological membrane can reach centimeters, wastewater is oxidized by contact with the biological membrane, and the mass transfer effect inside and outside the biological membrane is good, under the action of the biological membrane, the organic matter in the wastewater is degraded and purified, according to different aeration modes, the wastewater treatment equipment can work in different aerobic or anaerobic functional modes, each subregion has a main division and mutual cooperation, which is convenient for the cultivation and training of different functional biological membranes, and finally realizes one or more of the purposes of efficient carbon removal, nitrogen removal and phosphorus removal of wastewater.

[0022] (1) aerobic working mode: water is fed into the A region, the first aeration device is operated to aerate, the concentration of dissolved oxygen in water is increased, and the second filler device is not arranged in the D region; the wastewater sequentially contacts the filler fiber biological membrane in the B region, the C region and the E region, or the second aeration device at the bottom of the E region is selectively operated to aerate according to the need, or water is fed into the second water inlet at the bottom of the E region to supplement the carbon source, the B region, the C region and the E region can all work in an aerobic state, and organic pollutants are efficiently removed.

[0023] (2) Anoxic-anaerobic working mode: A zone is fed with water, the first and second aeration devices are not operated, B zone is operated in anoxic state, C zone is a transition state from anoxic to anaerobic, E zone is operated in anaerobic state, water can also be fed from the second water inlet at the bottom of E zone to supplement carbon source, and a second filler device can also be arranged in D zone to remove oxygen, so that E zone is operated in a more stringent anaerobic state to achieve carbon removal and denitrification.

[0024] (3) Aerobic-anaerobic working mode: A zone is fed with water, the aeration amount of the first aeration device is controlled so that B zone and C zone are aerobic metabolism zones mainly for removing BOD and nitrification, a second filler device is arranged in D zone to remove oxygen, the second aeration device of E zone is not operated, E zone is an anaerobic metabolism zone for denitrification or anaerobic ammonia oxidation to remove nitrogen, and is suitable for denitrification treatment of wastewater with high organic nitrogen and high ammonia nitrogen.

[0025] (4) Anoxic-anaerobic-aerobic working mode: A zone is fed with water, the first aeration device is not operated, B zone is operated in anoxic state, C zone is operated in anaerobic state, D zone is not provided with a second filler device, the second aeration device of E zone is operated to aerate, E zone is operated in aerobic state to achieve simultaneous nitrogen and phosphorus removal. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of the wastewater treatment device described in Example 1.

[0027] Figure 2 is a schematic diagram of the wastewater treatment device described in Example 2.

[0028] Figure 3 is a schematic diagram of the wastewater treatment device described in Example 3.

[0029] Figure 4 is a schematic diagram of the wastewater treatment device described in Example 4.

[0030] Legend in the figure: housing 1, first partition 2, second partition 3, third partition 4, fourth partition 5, perforated pipe 6, sponge iron particles 7, fifth partition 8, sixth partition 9, first water inlet 11, second water inlet 12, water outlet 13, first aeration device 14, sedimentation tank 15, exhaust port 16 / 17 / 18 / 19, second aeration device 20, movable plate 31, fiber bundle 61, sludge discharge pipe 151. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0032] Example 1.

[0033] As Figure 1As shown, an integrated aerobic wastewater treatment equipment, the overall appearance is cuboid structure, including shell casing 1, in the casing 1 inside in turn parallel interval vertical setting has first baffle 2, second baffle 3, third baffle 4, fourth baffle 5, wherein first baffle 2 and third baffle 4 and the bottom plate of casing fixed connection, the top of first baffle 2 and third baffle 4 and the top plate of casing exist certain interval, the interval allows water flow to pass from the upper portion in the casing, and the height of third baffle 4 is lower than first baffle 1;Second baffle 3 and fourth baffle 5 and the top plate of casing fixed connection, the bottom of second baffle 3 and fourth baffle 5 and the bottom plate of casing exist certain interval, the interval allows water flow to pass from the lower portion in the casing. The above four baffle plates divide the casing inside from left to right into five areas, respectively A area, B area, C area, D area, E area, A, B, C, E area top are each equipped with exhaust port 16, 17, 18, 19, the water flow direction in each area is as indicated by the arrow in the figure. The volume of B area and C area is similar, the volume of E area is twice or more than the volume of B area or C area, to exchange time with space, the hydraulic retention time in E area is significantly increased. In A, B, C, E each area can also be provided with pH sensor to detect pH value, sensor is connected with controller, and according to actual need adds acid or alkali to adjust the pH value of wastewater.

[0034] Wherein A area is aeration area, the bottom of A area is provided with first aeration device 14 to improve the concentration of dissolved oxygen in water, the lower part of the outer wall of A area is provided with first water inlet 11, the pretreated wastewater enters A area from the first water inlet 11 and flows upward; The first filler device is arranged in B area and C area, the first filler device comprises a plurality of porous tubes 6 arranged vertically and detachably installed, a plurality of water-permeable holes are arranged on the tube wall of the porous tube, a plurality of fiber bundle groups 61 are bound along the length direction at intervals outside the porous tube, the fiber bundle groups are fixed around the porous tube and dispersed in the shape of umbrella, the fiber bundle groups are completely immersed in water, and the types of fibers of the fiber bundle groups are one or a combination of inorganic fibers such as glass fiber, basalt fiber and aluminum silicate fiber. The diameter of these inorganic fibers is between several microns and tens of microns, the length is between several centimeters and tens of centimeters, and the length should not be more than 30 cm, preferably between 10-20 cm, they are good in flexibility, dispersed in water, have good tensile strength, are stable in chemical properties, resistant to acid and alkali corrosion, the number of fibers in each bundle group is in the order of magnitude of hundreds of thousands, and each fiber can quickly adsorb and gather a large amount of activated sludge microorganisms after contacting with wastewater, forming a biofilm or a bio-nest in the shape of a group, providing growth space for microorganisms, compared with the biofilm of about 2 mm formed by the traditional filler, the biofilm formed by the fiber bundle group has a thickness of several centimeters to tens of centimeters, can accommodate a large amount of biomass, greatly improves the oxidation speed of organic carbon and the rapid progress of nitrification reaction, and the porous tube passes through the inside of the fiber bundle group, the pipe has water flow, the water-permeable holes provide channels for the internal and external mass transfer of the bio-nest, the organic carbon transmitted by the porous tube provides a carbon source for the heterotrophic denitrification in the biofilm, and the denitrification reaction is accelerated. The sedimentation tank 15 is arranged at the bottom of B area and C area, and the biological sludge can be regularly discharged from the sludge discharge pipe 151 after sedimentation in the sedimentation tank. The third filler device is arranged in E area, and the third filler device can be the same as or different from the first filler device. The water outlet 13 is arranged on the upper part of the outer wall of E area, and the height of the water outlet 13 is lower than the height of the third partition plate 4. The second water inlet 12 and the second aeration device 20 can also be arranged at the bottom of E area to perform supplementary aeration or supplement carbon source by using original wastewater.

[0035] The fiber bundles of the first and third filler devices are inoculated and cultured with activated sludge from a sewage treatment plant as seed sludge. After successful biofilm formation, a spherical nest-like structure of biological aggregate biofilm, also known as biological nest, is formed. The biological nest has a large surface area and is immersed in oxygen-rich wastewater. Influenced by mass transfer, the biofilm on each fiber actually forms an aerobic-anoxic-anaerobic microenvironment from the outside to the inside. After the wastewater flows through the filler, aerobic metabolism occurs mainly, followed by anaerobic metabolism. The integrated aerobic wastewater treatment device has strong organic matter degradation capacity and good denitrification effect, and can be applied to the treatment of industrial wastewater and domestic sewage with high BOD load and high denitrification requirement. The removal rate of BOD5 can be as high as 99% or more, and the removal rate of total nitrogen can be as high as 90% or more.

[0036] Example 2.

[0037] As shown in Figure 2 , an integrated anaerobic wastewater treatment device. The difference from Example 1 is that the first aeration device in A zone and the second aeration device in E zone are cancelled, or the aeration devices are retained but not working, the first and third filler devices are retained, and a second filler device 7 is newly provided in D zone. The filler in the second filler device 7 is sponge iron particles, which serves to remove oxygen in water. When the anaerobic wastewater treatment device is working, the fiber bundles in the first and third fillers are inoculated and domesticated with sludge in a conventional anaerobic digester, and after successful biofilm formation, pretreated wastewater from A zone flows through B, C, D, and E zones in sequence. B zone operates in an anoxic state and can undergo hydrolysis acidification reaction to preliminarily degrade macromolecular organic matter in wastewater into soluble small-molecule organic matter such as glucose, amino acid-fatty acid, etc. C zone is a transition state from anoxic to anaerobic and can produce hydrogen and acetic acid. E zone operates in an anaerobic state and produces methane. In addition, water is supplied from the second water inlet at the bottom of E zone to supplement carbon source for heterotrophic denitrification and deep treatment of nitrate nitrogen. Therefore, the anaerobic wastewater treatment device can utilize denitrification reaction for efficient nitrogen removal, provide carbon source for denitrifying bacteria, and does not need external carbon source or sludge backflow, thereby simultaneously improving the removal efficiency of nitrate nitrogen and organic carbon in wastewater. For example, the original wastewater from a chemical plant has a COD concentration of 450 mg / L and a NO3-N concentration of 482 mg / L. After treatment by the anaerobic wastewater treatment device of Example 2, the NO3-N concentration is reduced to 4 mg / L and the COD concentration is reduced to 23 mg / L.

[0038] Example 3.

[0039] As shown in Figure 3As shown, an integrated aerobic-anaerobic wastewater treatment device. The difference from example 1 is that the second aeration device and the second water inlet of E area are cancelled (or the device is retained but not operated). A second filler device 7 is newly provided in the D area, and the filler in the second filler device 7 is sponge iron particles, which serves to remove oxygen in water. A movable plate 31 is provided at the lower part of the second partition 3 and the fourth partition 5, and by opening or closing the movable plate 31, the communication or isolation of the areas on both sides of the partition can be controlled. When the movable plate 31 is opened, the areas on both sides are communicated to allow water flow, and when the movable plate 31 is closed, the areas on both sides are blocked, which facilitates the enrichment culture and biofilm cultivation of different types of microorganisms in isolated areas, and improves the biofilm cultivation efficiency. In the upper part of the B area and the C area, a dissolved oxygen concentration sensor is also provided, and in the upper part of the C area, a nitrate concentration sensor and an ammonia nitrogen concentration sensor are also provided. These sensors can monitor the dissolved oxygen concentration and the concentrations of nitrate and ammonia nitrogen in wastewater in real time, and are connected to the controller of the wastewater treatment device, which controls the output power and aeration time of the first aeration device. The sensors and the controller are not shown in the figure. When running, water is fed into the A area, and the aeration amount of the first aeration device is controlled to make the B area and the C area aerobic metabolism areas mainly for removing BOD and nitrification reaction, and the sponge iron in the D area removes oxygen, and the E area is an anaerobic metabolism area, which utilizes anaerobic ammonia oxidation to remove nitrogen.

[0040] Specifically, the pretreated wastewater enters from the lower inlet of the A area, and the bottom aeration increases the oxygen content, i.e. the dissolved oxygen concentration DO, in the wastewater and promotes the upward flow of the wastewater. At the same time, the dissolved oxygen concentration in the B area and the C area is monitored in real time to feedback control the aeration amount, but the aeration is not excessive, which meets the requirements and saves energy.

[0041] The water flow rich in dissolved oxygen flows down through the B zone filler on which the biofilm is successfully formed. The dissolved and colloidal organic pollutants in the wastewater contact the biofilm on the fiber bundle. The microorganisms in the biofilm mainly perform rapid and large aerobic catabolism and anabolism. Due to the large concentration of dissolved oxygen in the wastewater, the catabolism is mainly aerobic respiration. Under the action of aerobic microorganisms and facultative microorganisms, the organic pollutants without nitrogen are finally decomposed into CO2 and H2O, and the degradation products of the nitrogen-containing organic matter also include NH3, and a large amount of energy is released. The metabolic speed is fast, the generated ammonia is dissolved in water, and the pH value of the wastewater is increased to a certain extent. At the same time, part of the energy generated by catabolism and nutrients in the wastewater are used to reproduce the microorganisms themselves, and a large amount of active sludge is generated to further adhere to the old biofilm to form new biofilm. When the biofilm accumulates to a certain extent, it will fall off and settle in the sedimentation tank 15 at the bottom of the B zone under the action of water flow and its own gravity. The biological sludge yield is large, and the biological sludge can be regularly discharged from the sludge discharge pipe 151 after being settled in the sedimentation tank. A small part of nitrification reaction of the ammonia nitrogen generated in the B zone will also occur under the action of nitrite bacteria and nitrate bacteria, but the nitrification reaction is at a disadvantage in the competition for dissolved oxygen with the catabolism.

[0042] The wastewater enters the lower part of the C zone from the lower part of the B zone. Most of the organic matter in the wastewater in the lower part of the C zone has been degraded, and the concentration of ammonia nitrogen in the wastewater reaches the maximum. A part of the dissolved oxygen still remains in the wastewater. After the wastewater enters the lower part of the C zone, it rises and contacts the biofilm on the fiber filler in the C zone, which has been pre-successfully formed. The C zone is the main digestion reaction zone. The ammonia nitrogen is nitrified to produce nitrite and nitrate under the action of nitrite bacteria and nitrate bacteria on the biofilm, and acid protons are generated, so that the pH value increased in the B zone is lowered again. Through detection and control of the dissolved oxygen concentration in the upper part of the B zone and the C zone, the ammonia nitrogen passing through the C zone is not completely digested, that is, the ammonia nitrogen is partially nitrified. In an ideal case, the ammonia nitrogen and nitrate in the effluent in the upper part of the C zone exist in a certain ratio, for example, 1:1. Of course, a small amount of organic matter BOD may still remain in the wastewater in the lower part of the C zone, and a small part of catabolism and anabolism will still occur, and a small part of biological sludge will be generated. A sedimentation tank and a sludge discharge pipe are also arranged at the bottom of the C zone to facilitate the sedimentation and removal of a small amount of biological sludge.

[0043] The wastewater enters the D zone through the upper part of the C zone. The D zone is a deoxygenation zone, and a second filler device 7 is arranged in the D zone. The filler in the second filler device 7 is sponge iron particles. The wastewater entering the D zone basically no longer contains organic pollutants, and the main pollutants are ammonia nitrogen and nitrate nitrogen, and a small amount of dissolved oxygen still exists in the water. When the wastewater passes through the sponge iron particles in the D zone, the sponge iron has high activity and can efficiently remove the residual dissolved oxygen in the wastewater, thereby providing an environmental guarantee for the anaerobic reaction in the E zone. In addition, under the action of the active sponge iron, the nitrate in the water is also mostly reduced to nitrite. The main pollutants in the effluent of the D zone are ammonia nitrogen and nitrite nitrogen. A dissolved oxygen concentration sensor is arranged in the lower part of the D zone or the E zone to ensure the deoxygenation effect.

[0044] The wastewater enters the lower part of the E zone through the lower part of the D zone. The E zone is an anaerobic metabolism zone, and the water flows upward in the E zone. A third filler device is arranged in the E zone. The third filler device has the same structure as the first filler device and is made of one or more of glass fiber, basalt fiber and aluminum silicate fiber. The biofilm on the fiber filler in the E zone is mainly trained anaerobic ammonia oxidation bacteria. The anaerobic ammonia oxidation bacteria are autotrophic bacteria and can utilize inorganic carbon sources such as CO2 and carbonate in the water. The ammonia nitrogen and nitrite nitrogen in the wastewater undergo anaerobic ammonia oxidation reaction under the action of the anaerobic ammonia oxidation bacteria, and the ammonia nitrogen and nitrite nitrogen undergo redox reaction and are all converted into nitrogen gas and discharged, thereby finally completing biological denitrification. The integrated aerobic-anaerobic wastewater treatment equipment of this example is suitable for carbon and nitrogen removal treatment of wastewater with high BOD load, high organic nitrogen and high ammonia nitrogen. The BOD8 of the leachate in a certain landfill site is 230 mg / L, and the NH3-N is 3500 mg / L. After the wastewater is treated by the equipment of Example 3, the removal rate of BOD5 is more than 98%, and the removal rate of ammonia nitrogen is more than 95%.

[0045] Example 4.

[0046] As Figure 4As shown, an integrated anoxic-anaerobic-aerobic wastewater treatment device, which is different from example 1 in that the first aeration device in the A zone is cancelled (or retained but not working), the second water inlet of the E zone is cancelled; at the same time, the fifth partition plate 8 and the sixth partition plate 9 are added in the B zone, so that the B zone in example 1 is divided into B1 zone, B2 zone and B3 zone, the fifth partition plate 8 is close to the first partition plate 2, the top of the fifth partition plate 8 is connected with the top of the shell, the bottom of the fifth partition plate 8 is spaced apart from the bottom of the shell by a certain distance to allow water flow, the bottom of the sixth partition plate 9 is fixedly connected with the bottom of the shell, the top of the sixth partition plate 9 is spaced apart from the top of the shell by a certain distance to allow water flow, and the height of the sixth partition plate 9 is greater than the height of the third partition plate 4 and less than the height of the first partition plate 2. After such arrangement, the water in the B1 zone and the B3 zone flows downward, the first filler is installed in the B2 zone, and the water in the B2 zone flows upward, so as to facilitate more sufficient contact reaction between the sewage and the filler. During operation, the pretreated raw wastewater enters from the A zone, the filler in the B zone operates in an anoxic state, the filler in the C zone operates in an anaerobic state, the nitrate in the raw water undergoes heterotrophic denitrification reaction and is removed, and part of the organic matter is also removed, at the same time, the microorganisms in the biofilm release phosphorus in the anaerobic environment, then the wastewater enters the E zone, the second aeration device in the E zone operates to aerate and oxygenate, the filler fiber bundle biofilm in the E zone operates in an aerobic state, the microorganisms degrade BOD and absorb and enrich phosphorus on the filler fiber bundle biofilm, the filler can be replaced regularly, and the comprehensive effect of denitrification, phosphorus removal and carbon removal is realized. In the wastewater generated by a food processing plant, BOD5 is 2500-3500 mg / L, TN is 150-250 mg / L, and TP is 35-50 mg / L; after treatment by the device and process of example four, the effluent quality is relatively stable, the BOD5 in the effluent quality is stably below 30 mg / L, the TN is stably below 8 mg / L, and the TP is below 0.5 mg / L, which can meet the discharge standard, the sludge amount is reduced, and the effluent quality is stable.

[0047] The essence of the wastewater treatment equipment of each embodiment listed above is a biological reactor, and the working mode is to remove pollutants in wastewater by contact oxidation of the pollutants on the fiber bundle group biological membrane on the filler device. The species of the bacterial flora on the fiber bundle group biological membrane can be in-situ biofilm acclimated or the fiber bundle group with biofilm outside can be directly transplanted and installed in the treatment device for convenient replacement. The fiber bundle group on the filler device can be surface modified by a certain physical or chemical method to improve its surface roughness, hydrophilicity and biological affinity. In addition, the fiber bundle group can be fumigated in sulfur steam for a certain period of time before use, so that a layer of sulfur element is adsorbed on the surface of part of the fibers. When put into water, the elemental sulfur adsorbed on the surface of the fibers is in the internal core of the anaerobic zone, which helps to occur the sulfur autotrophic denitrification reaction. The sulfur autotrophic denitrification reaction and the original heterotrophic denitrification or anaerobic ammonia oxidation synergistically improve the denitrification effect. For example, the following modification process can be used: take 10 cm long, 2-3 microns in diameter, and 0.8-1.2 MPa in tensile strength of aluminum silicate fiber, completely soak in 1 mol / L hydrochloric acid for 10 minutes, then transfer to a mixed solution of polyacrylamide and MPS coupling agent, adjust the pH to about 4.5 with acetic acid, soak at room temperature for 120 min, take out and dry, dry at 100℃ for 2h, to obtain modified fibers coupled by chemical coupling agent to improve hydrophilicity. The original fiber or the coupled modified fiber can also be fumigated in sulfur steam for 5 min, and part of the sulfur condensed on the fiber after sulfur sublimation. Then the modified fiber is bundled on the porous pipe to make an umbrella-shaped fiber bundle group. These fiber bundle groups are evenly distributed along the porous pipe axis at intervals of 20 cm. The coupled modified or sulfur modified inorganic fiber filler has good carbon and nitrogen removal effect when used in wastewater treatment.

[0048] In summary, the wastewater treatment equipment has high integration degree, flexible working mode, and remarkable BOD removal, denitrification and phosphorus removal effect. It is a good choice for laboratory or factory or small test, pilot test, type operation and other occasions of sewage treatment plant.

Claims

1. An anaerobic wastewater treatment apparatus, characterized by comprising: The shell is divided into five areas, A, B, C, D and E, in which water flows in sequence; a first water inlet is arranged at the lower part of the outer side wall of the A area; a plurality of first filler devices are arranged in the B and C areas; a second filler device is arranged in the D area, in which the filler is sponge iron particles, and the D area is a deoxygenation area; a plurality of third filler devices are arranged in the E area, in which water flows upward, and a water outlet is arranged at the upper part of the outer side wall of the E area; the first and third filler devices have the same structure, each of which comprises a plurality of porous tubes arranged vertically, and a plurality of fiber bundle groups are bound on the porous tubes along the length direction, and the fiber bundle groups are all immersed in water.

2. An anaerobic wastewater treatment apparatus according to claim 1, wherein The volumes of the B and C areas are similar, and the volume of the E area is more than twice the volume of the B or C area.

3. The apparatus for anaerobic wastewater treatment according to claim 1, wherein The fiber type of the fiber bundle group is aluminum silicate fiber, which is chemically modified and / or sulfur fumigation modified before use.

4. The apparatus for anaerobic wastewater treatment according to claim 1, wherein A sedimentation tank is arranged at the bottom of the B and C areas, and a sludge discharge pipe is arranged on the sedimentation tank.

5. The apparatus for anaerobic wastewater treatment according to claim 1, wherein A second water inlet is further arranged at the bottom of the E area.

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