Anaerobic device suitable for nano iron water treatment filler and control method thereof

Abstract

The present invention discloses an anaerobic device suitable for nano iron water treatment filler and a control method thereof. The device comprises a hydrolysis reactor and a methanogenic reactor, a feeding device, a filler conveying pipe and an isolating device, and the water phase and gas phase of the hydrolysis reactor and the methanogenic reactor are connected. A gas collection area, a hydrolysis reaction area and a filler crushing area are formed in sequence from top to bottom in the hydrolysis reactor; a water outlet area, a methanogenic reaction area and a granular sludge discharge area are formed in sequence from top to bottom in the methanogenic reactor; the control method of the device comprises four steps: feeding, transferring, cutting and discharging sludge. The main purpose of the present invention is to solve the problems of biological toxicity and sludge mineralization in the process of using nano iron water treatment filler for anaerobic biochemical treatment of sewage through an anaerobic device suitable for nano iron water treatment filler and a control method thereof, so as to increase the methane yield.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and more specifically to an anaerobic device suitable for nano iron water treatment filler and a control method thereof. Background Art

[0002] At present, anaerobic digestion technology is used to treat degradable organic pollutants, and the methane produced by treating pollutants is used as biogas for renewable energy, making it widely used. Studies have found that adding nano-iron to the anaerobic biochemical system is a good way to enhance anaerobic methane production.

[0003] Nano zero-valent iron refers to zero-valent iron particles with a particle size between 1 and 100 nm. It has a large specific surface area and surface energy, which makes it have excellent adsorption and high reducibility, and produces unique surface effects and small size effects to improve reactivity. It is precisely because of the unique advantages of nano zero-valent iron that it is "easy to agglomerate", "easy to oxidize", and it is easy to produce hydroxides and metal carbonates when degrading pollutants in water, which adhere to the surface of nano zero-valent iron and passivate it, making it difficult for nano zero-valent iron to maintain its activity for a long time.

[0004] In addition, due to the "core-shell structure" of nano zero-valent iron, the outer shell is mainly composed of iron oxide or hydroxyl iron, which makes the nano iron particles have chemical bonding and adsorption functions, and easily combine with phosphate in the wastewater to form precipitates, which are deposited in the granular sludge bed at the bottom of the reactor, not only causing the loss and waste of nano zero-valent iron, but also causing the accumulation of iron sludge in the anaerobic system to produce chemical sludge and biological toxicity, inhibiting the microbial activity of granular sludge, and being unfavorable for the long-term operation of anaerobic reactors and other application problems.

[0005] The existing patent, Device and method for treating wastewater by improving the utilization rate of nano zero-valent iron (publication number: CN103172151A), discloses a device that is separated and interconnected by a lower baffle and an upper baffle to form a reaction zone, a buffer zone and a sedimentation zone. The reaction zone is equipped with an agitator, a mud discharge pipe at the bottom, a water inlet pipe and a dosing pipe on the side wall, and an air inlet pipe and an exhaust pipe at the top; the sedimentation zone is equipped with an inclined plate, a triangular weir and a water outlet pipe above the inclined plate, and a circulation pipe at the bottom. The reaction zone and the sedimentation zone are connected by a sludge circulation pump. The patent continuously treats wastewater by reducing and adsorbing nano zero-valent iron, accelerating iron ion co-precipitation and sludge reuse.

[0006] The existing patent, a sewage anaerobic hydrolysis acidification tank (publication number: CN202658007U), discloses a technical solution including an acidification tank shell, a suspended sludge bed, a sewage lifting pump, a water distribution pipe system, an outlet pipe, and a sludge discharge pipe 6, which is used to solve the technical solution of improving the biodegradability of sewage and the uneven water distribution and insufficient water flow power of the existing process.

[0007] An existing patent, a zero-valent iron two-phase anaerobic reactor (publication number: CN102120675A), discloses a technical solution including an anaerobic hydrolysis acidification reactor, a water inlet pump, a regulating tank, a circulation pump and an anaerobic methanogenesis reactor. The patent is used to solve the defects of the anaerobic reactor being difficult to start and easy to acidify, and improves the methane production by utilizing a nano zero-valent iron filling layer.

[0008] Through the analysis of existing technologies, it is found that the current anaerobic treatment equipment is unable to properly circulate the nano-iron water treatment filler, and the long-term addition of nano-zero-valent iron cannot be discharged in time, resulting in a decrease in the content of polysaccharides and proteins in the soluble microbial products of anaerobic granular sludge, and the activity of methanogens is affected to a certain extent. The existing anaerobic digestion equipment generally has the problems of low biogas conversion rate and poor stability, resulting in the energy recovery and economic benefits of anaerobic digestion facilities are not obvious. Summary of the invention

[0009] 1. Technical problem to be solved by the invention

[0010] The present application provides an anaerobic device suitable for nano iron water treatment filler and a method of using the same, which can enable the nano iron water treatment filler to flow effectively, thereby solving the problems of sludge mineralization and toxicity, and weak methane production capacity generated by the anaerobic device during the treatment of organic pollutants.

[0011] 2. Technical solution

[0012] In order to achieve the above-mentioned purpose, the technical solution provided in the first aspect of this application is:

[0013] An anaerobic device suitable for nano iron water treatment filler, comprising a hydrolysis reactor and a methanogenic reactor, wherein the hydrolysis reactor and the methanogenic reactor are connected to each other by water through a water circulation pipe and a circulation pump, and are connected to each other by gas transmission connecting pipe, and further comprising a feeding device, a filler conveying pipe and an isolation device;

[0014] The hydrolysis reactor is provided with a water inlet distribution pipe, a grid A and a grid E from top to bottom, a flow pusher is provided between the grid A and the grid E, and the grid A can be opened and closed;

[0015] A feeding device, a grid C and a water distribution pipe are arranged in order from top to bottom in the methanogenic reactor, and the bottom of the methanogenic reactor is connected to a mud discharge pipe;

[0016] The feeding device is used to feed fillers into the methane production reactor;

[0017] The filler delivery pipe is used to deliver the filler in the methanogenic reactor to the hydrolysis reactor;

[0018] The isolator is used to control the flow area of ​​the nano-iron water treatment filler in the methanogenic reactor.

[0019] Furthermore, the level of the filler delivery pipeline connected to the hydrolysis reactor is lower than the level of the filler delivery pipeline connected to the methanogenic reactor.

[0020] Furthermore, the angle between the filler conveying pipe and the horizontal plane is 20 to 30 degrees.

[0021] Furthermore, the first isolation device scheme includes a grid B and a sewage return pipe, wherein the grid B is arranged in the methanogenic reactor, the grid B is located on the upper side of the grid C, the sewage return pipe is connected to the methanogenic reactor at one end at a level higher than that of the grid B, and the other end is connected to the hydrolysis reactor, a methanogenic reaction zone is formed between the grid B and the grid C, and the feeding device feeds the filler into the methanogenic reaction zone.

[0022] Furthermore, the isolation device scheme 2 includes a grid B, a guide rail and a pull rope A. The guide rail is arranged on the inner wall of the methanogenic reactor and is located on the upper side of the grid C. The grid B slides up and down along the guide rail through the pull rope. The filler delivery pipe is connected to one end of the methanogenic reactor and is within the horizontal height range of the guide rail.

[0023] Furthermore, a filler crushing area is formed between the grid A and the grid E. The cross-sectional shape of the grid E is a trapezoid, and the side of the trapezoid forms an angle of 20 to 45 degrees with the inner wall of the hydrolysis reactor.

[0024] Furthermore, a grid D is provided on the upper side of the water inlet distribution pipe in the hydrolysis reactor, and a hydrolysis reaction zone is formed between the grid A and the grid D.

[0025] Furthermore, the grid A, grid C and grid D are grid plates with an aperture of 5-8 mm, and the grid E is a grid plate with an aperture of 3-4 mm.

[0026] Furthermore, the water distribution pipe is connected to the water circulation pipe, the water outlet holes arranged on the water distribution pipe are alternately arranged up and down, and the apertures of the water outlet holes are gradually reduced along the water inlet direction.

[0027] Furthermore, the angle between the water outlet direction of the water distribution pipe and the water inlet direction of the water outlet pipe of the water distribution pipe gradually changes from 60 degrees to 120 degrees, the aperture of the water outlet hole is 5~10 mm, and the spacing between the water outlet holes is 20~100 mm.

[0028] Furthermore, a three-phase separator A and a three-phase separator B are arranged in the methanogenic reactor, and the level of the three-phase separator B is higher than the level of the sewage return pipe.

[0029] Furthermore, the hydrolysis reactor and the methanogenic reactor are connected through a three-phase separator gas delivery pipe, and the three-phase separator gas delivery pipe is connected to the gas collecting chambers of the three-phase separator A and the three-phase separator B.

[0030] Furthermore, the feeding device includes a feeding port, a feeding pipe, a float, a pull rope, a roller and a bracket. The feeding port is funnel-shaped and connected to the feeding pipe. The pull rope is connected to the float. After the pull rope is wrapped around the roller, it is led out from the feeding port. The roller is placed on the bracket, and the bracket is fixed in the methane production reactor.

[0031] Furthermore, the nano iron water treatment filler in the present application is prepared from nano zero-valent iron, dispersant solution, indicator, gel, and lightweight porous sponge, and the nano iron water treatment filler is square and / or spherical porous particles with a filler density of 0.98~1.15g / cm 3 .

[0032] The second aspect of the present application relates to a control method for an anaerobic treatment device for nano iron water treatment filler, comprising the following steps:

[0033] Step 1: Feeding: feed the nano iron water treated filler into the methanogenic reactor through the feeding device, and adjust the circulation pump to make the hydraulic rising flow rate of the methanogenic reactor maintain normal operation. The rising flow rate is preferably controlled at 3-5m / h and run for 30-60 days;

[0034] Step 2: Transferring materials. When more than 80% of the fillers in the methanogenic reactor are purple and / or brown, adjust the circulation pump to make the hydraulic rise velocity reach 10~20m / h for 1~3h, so that the nano-iron water treated fillers are transferred to the hydrolysis reactor. After the fillers are transferred, adjust the circulation pump to restore the hydraulic rise velocity to 1~3m / h to maintain the normal operation of the methanogenic reactor.

[0035] Step 3: Cutting. When more than 80% of the fillers in the hydrolysis reactor are dark purple and / or dark brown, increase the speed of the flow propeller to cut the nano iron water treated fillers. The broken fillers pass through the grid E and are transported to the methanogenic reactor by the circulation pump.

[0036] Step 4: Sludge discharge. The granular sludge is discharged through the sludge discharge pipe.

[0037] Furthermore, the operating control parameters of the methanogenic reactor from the first step to the fourth step are: pH value 6.5~7.8, volumetric load 10~20kgCOD / (m³·d), temperature 20~35°C, and the operating control parameters of the hydrolysis reactor from the first step to the fourth step are: pH value 6.2~7.0, volumetric load 2~3kgCOD / (m³·d), temperature 20~35°C.

[0038] 3. Beneficial effects

[0039] One or more technical solutions provided in the embodiments of the present application have at least the following beneficial effects:

[0040] The anaerobic device suitable for nano iron water treatment filler of the present invention realizes water phase circulation of the hydrolysis reactor and the methanogenesis reactor through a water circulation pipe, a circulation pump and a sewage return pipe, realizes the circulation of the nano iron water treatment filler in the hydrolysis reactor and the methanogenesis reactor through a filler conveying pipe, and realizes effective circulation of the nano iron water treatment filler through the hydrolysis reaction zone and the filler crushing zone of the hydrolysis reactor, the methane reaction zone in the methanogenesis reactor and the granular sludge discharge, thereby improving the utilization rate of the nano iron water treatment filler and solving the biological toxicity problem caused by the long-term release of nano zero-valent iron.

[0041] The control method of an anaerobic device suitable for nano iron water treatment filler of the present invention includes four steps of filling, material transfer, material cutting and sludge discharge. The four steps ensure that the anaerobic device fully utilizes the nano iron water treatment filler, which not only effectively solves the sludge mineralization and biological toxicity problems caused by long-term addition of nano zero-valent iron, and ensures the long-term operation of the anaerobic reaction device, but also the anaerobic device can produce high-quality anaerobic granular sludge, thereby obtaining certain economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A structural schematic diagram of an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of a water distribution pipe structure according to an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of a water inlet distribution pipe structure according to an embodiment of the present invention;

[0045] Figure 4 This is a schematic structural diagram of a feeding device according to an embodiment of the present invention;

[0046] Figure 5 This is a schematic structural diagram of a grid A according to an embodiment of the present invention;

[0047] Figure 6 It is a partial enlarged view of the hinge of the grille A of the present invention;

[0048] Figure 7 This is a schematic diagram of the structure of the grille B with a pull rope line B of the present invention;

[0049] Figure 8 A flow chart of a control method of an anaerobic treatment device for nano iron water treatment filler according to an embodiment of the present invention;

[0050] Fig. 9 A schematic diagram of a nanofiller structure used in an embodiment of the present invention;

[0051] Fig.10 A schematic diagram of another structure of nano zero-valent iron used in an embodiment of the present invention.

[0052] Explanation of the symbols in the schematic diagram:

[0053] 1. Gas delivery valve; 2. Three-phase separator gas delivery pipe; 3. Sewage return pipe; 31. Sewage return valve; 4. Filler delivery pipe; 41. Delivery valve; 5. Water circulation pipe; 51. Circulation pump; 6. Mud discharge pipe; 61. Mud discharge valve; 7. Gas delivery connecting pipe; 8. Water outlet weir; 81. Water outlet channel;

[0054] 10. Hydrolysis reactor; 11. Three-phase separator A; 12. Grid D; 13. Water inlet distribution pipe; 14. Grid A; 141. Perforated plate; 142. Hinge; 143. Pull rope A; 144. Inner wall roller; 145. Top roller; 15. Grid E; 16. Flow pusher;

[0055] 20. Methanogenic reactor; 21. Three-phase separator B; 22. Grid B; 221. Pull rope B; 222. Buckle; Pulley 223; 23. Grid C; 24. Water distribution pipe; 241. Water outlet hole; 242. Water outlet pipe; 25. Guide rail;

[0056] 30. Feeding device; 301. Feeding port; 302. Feeding pipe; 303. Float; 304. Pull rope; 305. Roller; 306. Bracket. DETAILED DESCRIPTION

[0057] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0058] This application provides an anaerobic treatment device suitable for nano iron water treatment filler and its use method. It solves the technical problem that the existing anaerobic digestion technology sewage treatment device has insufficient utilization of nano zero-valent iron, and the long-term use of nano zero-valent iron in the anaerobic device leads to sludge mineralization and biological toxicity in the anaerobic treatment device, resulting in low methane production. The technical solution in the embodiment of this application is to solve the above-mentioned technical problems of sludge mineralization and biological toxicity, and the overall idea is as follows:

[0059] The anaerobic treatment device (hereinafter referred to as "anaerobic treatment device") suitable for nano iron water treatment filler feeds the nano iron water treatment filler (hereinafter referred to as "filler") into its methanogenic reactor 20 through a feeding device. After the filler reacts in the methanogenic reactor 20 for a period of time, it is transported to the hydrolysis reactor 10 through the filler delivery pipe 4 to continue to react for a period of time, and then the filler is broken. The broken filler is transferred to the methanogenic reactor 20 again through the water circulation pipe 5 and the circulation pump 51. After the broken filler is combined with the sludge particles, it is discharged through the sludge discharge pipe 6. The problem of biological toxicity and sludge mineralization caused by long-term nano zero-valent delivery in the anaerobic treatment device is solved by effectively circulating the filler in the anaerobic treatment device.

[0060] In order to better understand the above technical solution, the above technical solution is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0061] Example 1

[0062] Combination Figure 1 The anaerobic device for nano iron water treatment filler of this embodiment includes a hydrolysis reactor 10 and a methanogenic reactor 20. The hydrolysis reactor 10 and the methanogenic reactor 20 are gas-connected through the three-phase separator gas delivery pipe 2 and the gas delivery connecting pipe 7. The first port of the three-phase separator gas delivery pipe 2 is connected to the gas collecting chamber of the three-phase separator A11 and the three-phase separator B21, and the second port extends into the hydrolysis reactor 10. The gas delivery connecting pipe 7 is a three-way pipeline, the first port of which is connected to the top of the hydrolysis reactor 10, the second port is connected to the top of the methanogenic reactor 20, and the third port is connected to the gas delivery valve 1, which is used to control the exhaust rhythm of the anaerobic treatment device of this embodiment.

[0063] The hydrolysis reactor 10 and the methanogenic reactor 20 are connected in water through the circulation pump 51 and the water circulation pipe 5. The water circulation pipe 5 connects the methanogenic reactor 20, the circulation pump 51 and the hydrolysis reactor 10, and the water circulation pipe 5 is connected to the bottom of the methanogenic reactor 20 and the hydrolysis reactor 10. When the equipment is running, the circulation pump 51 can realize the circulation of water in the anaerobic treatment device.

[0064] The hydrolysis reactor 10 is provided with a water inlet distribution pipe 13, a grid A14 and a grid E15 in sequence from top to bottom, and a flow pusher 16 is also provided between the grid A14 and the grid E15. Among them, a filler crushing area is formed between the grid A and the grid E15, and the apertures of the grid A and the grid E15 are smaller than the aperture of the filler entering the hydrolysis reactor 10. The sewage enters the hydrolysis reactor 10 through the water inlet distribution pipe 13, and the part of the water inlet distribution pipe 13 entering the hydrolysis reactor 10 is provided with uniformly distributed water outlets, and the outlet direction is vertically downward.

[0065] Combination Figure 5, the grille A is a mesh plate with an opening and closing function. Specifically, the grille A includes two semicircular perforations 141, a hinge 142, a pull rope A143, an inner wall roller 144, and a top roller 145. The first end of the hinge 142 is fixed to the inner wall of the hydrolysis reactor 10, and the second end is fixed to the perforated plate 141. The straight edge of the perforated plate 141 is connected to the pull rope 143, and the pull rope 143 is respectively connected to the inner wall roller 144 and the upper roller 145. The upper roller 145 is arranged near the water inlet pipe 13, and the pull rope A143 passing through the top roller 145 extends out of the hydrolysis reactor 10 through the water inlet pipe 13.

[0066] The methanogenic reactor 20 is provided with a feeding device 30, a grid C23 and a water distribution pipe 24 in sequence from top to bottom. The water distribution pipe 24 is directly connected to the water circulation pipe 5. The bottom of the methanogenic reactor 20 is connected with a sludge discharge pipe 6. The sludge discharge pipe is provided with a sludge discharge valve 61. The water distribution pipe 24 is provided with upper and lower alternating water outlet holes 241 along the direction of the outlet pipe 242. In this design, the water outlet holes 241 on the upper side of the water distribution pipe 24 continuously flush the filler in the methanogenic reactor 20 and continuously flush the lower area of ​​the water distribution pipe 24, which can solve the problem of solidification of the granular sludge layer of the anaerobic reaction device of this embodiment, and facilitate the regular discharge of sludge particles in the anaerobic treatment device through the opening and closing of the sludge discharge valve 61.

[0067] The feeding device 30 in this embodiment is preferably of the following structure, including a feeding port 301, a feeding pipe 302, a float 303, a pull rope 304, a roller 305 and a bracket 306. The feeding port 301 is preferably funnel-shaped and connected to the feeding pipe 302. The pull rope 304 is connected to the float 303. After the pull rope 304 is wrapped around the roller 305, it is led out from the feeding port 301. The roller 305 is arranged on the bracket 306, and the bracket is fixed in the methane production reactor 20.

[0068] When in use, the float 303 can be moved away from the discharge port of the feeding device 30 by pulling the rope 304. At this time, the filler can fall into the methane enhanced reactor 20. After the feeding is completed, the pull rope 304 is loosened, and the float 303 blocks the discharge port of the filler device under the buoyancy of the water. The feeding device 30 using the float 303 can enhance the safety of the anaerobic treatment device of this embodiment. On the one hand, the float 303 ensures the good sealing of the methane production reactor. On the other hand, if a cover is set at the feeding port 301, the cover will be easily broken when it is unscrewed for feeding under the pressure of the generated methane gas, causing harm to the operator. The setting of the float 303 can well avoid this problem. Of course, setting a cover at the feeding port 301 can also play a sealing role of the float, but the design of the float is the preferred solution.

[0069] One end of the filler delivery pipe 4 is connected to the hydrolysis reactor 10, and the other end is connected to the methane reactor 20, which is used to transport the filler in the methanogenic reactor 20 to the hydrolysis reactor 10. As a preferred solution, the horizontal height of the filler delivery pipe 4 connecting one end of the hydrolysis reactor 10 is lower than the horizontal height of the one end of the methanogenic reactor 10. The preferred angle between the filler delivery pipe 4 and the horizontal plane is 20 to 30 degrees. When it is necessary to transfer the nano iron water treated filler from the methanogenic reactor to the hydrolysis reactor, open the filling valve 41 and adjust the isolation device so that the isolation device no longer hinders the nano iron water treated filler from entering the filler delivery pipe 4. Since the filler delivery pipe 4 has a certain inclination, after the nano iron water treated filler enters the filler delivery pipe 4, it can quickly slide to the hydrolysis reactor 10 under the action of gravity, avoiding the nano iron water treated filler from accumulating in the filler delivery pipe 4.

[0070] The isolation device of the anaerobic treatment device of this embodiment is used to control whether the filler can enter the filler conveying pipeline 4. Scheme 1 of the isolation device: The isolation device includes a grid B22 and a sewage return pipe 3. The grid B22 is placed in the methanogenic reactor 20. Preferably, the grid B22 and the grid C23 are relatively parallel. The grid B22 is located on the upper side of the grid C23. A methanogenic reaction zone can be formed between the grid B22 and the grid C23. The methanogenic reaction zone is used to accommodate the filler. In this scheme, one end of the sewage return pipe 3 is connected to the hydrolysis reactor 10, and the other end is connected to the methanogenic reactor 20. The height of the end connected to the methanogenic reactor 20 is higher than the height of the grid B22 in the methanogenic reactor 20. Preferably, the sewage return pipe 3 is set horizontally. In this scheme, the end of the feeding device 30 extends into the methanogenic reaction zone, the filler is directly placed in the methanogenic reaction zone, and the filler conveying valve 41 is closed. The sewage is circulated counterclockwise in the anaerobic treatment device through the water circulation pipe 5, the circulation pump 51 and the sewage return pipe 3. The filler moves with the water circulation. When the filler is washed to the position of the grid B22, it is blocked by the grid B22, so that the filler stays in the methanogenic reactor 20.

[0071] In the first isolation device scheme, the end of the feeding device 30 may not extend into the methane reaction zone, but at this time, the grid B22 should be able to open and close. When the feeding device 30 is feeding, the grid B22 is opened so that the filler can fall into the methane reaction zone and will not fall on the grid B22. After the feeding is completed, the grid B22 is closed so that the filler is in the methane reaction zone. Compared with the feeding device directly extending into the methane reaction zone, this design is more complicated in operation, and the filler is less efficient during the material transfer process. Therefore, it is a better choice for the feeding device to directly feed the filler into the methane reaction zone.

[0072] In the first isolation device scheme, two ports of the sewage return pipe 3 are respectively connected to the middle and upper positions of the hydrolysis reactor 10 and the methanogenic reactor 20, and the sewage return pipe 3 is provided with a sewage return valve 31. By adjusting the circulation pump 51, the sewage return valve 31 and the feed valve 41, the rising flow rate and the volume load value of the methanogenic reactor 20 and the hydrolysis reactor 10 are controlled.

[0073] Isolation device scheme 2: The isolation device includes a grid B22, a guide rail 25 and a pull rope B221. The guide rail 25 is arranged on the inner wall of the methanogenic reactor 20, and the guide rail 25 is located on the upper side of the grid C23. The grid B22 slides up and down along the guide rail 25 under the pull of the pull rope B221. One end of the pull rope B221 is connected to the grid B22, and is connected to the buckle 222 and the pulley 223. One end of the pull rope B221 can be led out of the methanogenic reactor from the feeding pipe 302 of the feeding device 30 or led out of the methanogenic reactor 20 through the outlet weir 8 and the outlet channel 81.

[0074] A methanogenic reaction zone is formed between the grid B22 and the grid C23, and the end of the feeding device 30 extends into the methanogenic reaction zone to feed the filler into the methanogenic reaction zone. The filler delivery pipe 4 is connected to one end of the methanogenic reactor and is within the sliding range of the grid B. During operation, the grid B22 is slid along the guide rail 25 to below the end of the filler delivery pipe 4 connected to the methanogenic reactor 20. At this time, the filler is placed between the grid B22 and the grid C23 to play a role and cannot pass through the grid B22 to enter the filler delivery pipe 4. When the filler needs to enter the filler delivery pipe 4, the grid B22 is slid to above the end of the filler delivery pipe 22 connected to the methanogenic reactor 20. At this time, the grid B22 cannot intercept the filler, and the filler can enter the filler delivery pipe 4.

[0075] Isolation device scheme three: a hole grid that can be opened and closed is set at the port where the filler delivery pipe 4 is connected to the methanogenic reactor 20 or in the filler delivery pipe 4. The so-called hole grid that can be opened and closed means that when the hole grid is closed, the hole grid covers the cross section of the filler delivery pipe, so that the filler cannot pass through the filler delivery pipe into the hydrolysis reactor 20. When the filler needs to enter the hydrolysis reactor 20, the hole grid is opened, and the filler will not be blocked from entering the hydrolysis reactor 10.

[0076] Compared with isolation device schemes 2 and 3, although scheme 1 of the isolation device has an additional sewage return pipe 3, it is more convenient to operate. The sewage return pipe 3 can also replace the filler conveying pipe 4 to complete the water circulation of the anaerobic treatment device of this embodiment, so that the filler conveying pipe 4 is dedicated to filler conveying, further improving the efficiency of the anaerobic treatment device.

[0077] The general process of the anaerobic device for nano iron water treatment filler of the present invention is that the sewage enters the hydrolysis reactor 10 through the water inlet distribution pipe 13, and the sewage is circulated in the hydrolysis reactor 10 and the methanogenic reactor 20 through the water circulation pipe 5, the circulation pump 51, and the sewage return pipe 3. The feeding device 30 transports the filler to the methanogenic reactor 20. After the filler has been initially operated for a period of time in the methanogenic reactor 20, the filler is transported to the hydrolysis reactor 10 through the filler delivery pipe 4. After the filler continues to work for a period of time in the hydrolysis reactor 10, the power of the flow propeller is increased to crush the filler. The crushed filler enters the methanogenic reactor 20 through the water circulation pipe 5, combines with the sludge in the sewage, becomes sludge particles, and is discharged through the sludge discharge pipe 6. The sewage passing through the anaerobic reaction device of this embodiment can be discharged through the outlet weir 8 and the outlet channel 81 on the methanogenic reactor 10.

[0078] Example 2

[0079] The anaerobic device for treating fillers with nano iron water in this embodiment is further improved on the basis of the first embodiment. A grid D12 is provided on the upper side of the water inlet pipe 13 in the hydrolysis reactor 10. A hydrolysis reaction zone is formed between the grid A14 and the grid D12. A filler crushing zone is formed between the grid A14 and the grid E15 to crush the fillers entering therein. The flow pusher 16 is arranged in the filler crushing zone, and the grid A14 can be opened and closed. The so-called opening and closing of the grid A14 means that when the grid is closed, the filler is above the grid A14 and cannot fall into the filler crushing zone. When the grid A14 is opened, the filler is no longer blocked by the grid A14 and falls into the filler crushing zone.

[0080] The methanogenic reactor 20 is provided with a feeding device 30, a grid B22, a grid C23, a water distribution pipe 24, and a guide rail 25 from top to bottom. The end of the feeding device 30 is flush with or lower than the grid B22. A methane reaction zone is formed between the grid B22 and the grid C23. The methane reaction zone is used to accommodate fillers, and microorganisms react with organic sewage to produce methane. A granular sludge discharge zone is formed below the grid C23. A sludge discharge pipe 6 is connected to the bottom of the methanogenic reactor 20, and a sludge discharge valve 61 is provided on the sludge discharge pipe 6. In this embodiment, when the sludge accumulates to contact the grid C23, the sludge discharge valve 61 is opened to discharge the sludge particles in the granular sludge discharge zone from the methanogenic reactor 20.

[0081] The grille A14, grille B22, grille C23 and grille D12 in this embodiment are preferably mesh plates with a hole diameter of 5-8 mm, and the grille E15 is preferably a mesh plate with a hole diameter of 3-4 mm. The material of the mesh plate can be metal, plastic, etc. The grille A14 is fixed to the inner wall of the hydrolysis reactor 10 by a hinge connection, and its opening and closing function can also be realized.

[0082] When the pull rope connected to the grid A14 is in a loose state and the grid 14 is in a closed state, it can support the filler in the hydrolysis reaction zone. After the filler has worked for a period of time, the pull rope is tightened to open the grid A14. At this time, the filler can quickly fall onto the grid E15. After all the filler has fallen, the grid A14 is closed to make the filler fall between the grid A14 and the grid E. The density of the filler is close to the density of water. The speed of the flow promoter 16 is increased. The flow promoter 16 is preferably a variable frequency flow promoter 16 with a shearing function, which makes it easier to cut the filler. When the size of the filler is smaller than the aperture of the grid E15, the filler leaks out of the aperture and is transported to the methane production reactor 20 through the circulation pump 51.

[0083] In this embodiment, the connection relationship of the sewage return pipe 3 is that one end is connected to the hydrolysis enhancement reaction zone, and the other end is connected to the top of the grid B22. The filler delivery pipe 4 is connected to the hydrolysis reaction zone and the methane reaction zone, and the circulation pump 51 is connected to the filler crushing zone and the water distribution pipe 24 through a pipeline. The sewage return pipe 3 and the filler delivery pipe 4 are respectively provided with a sewage return valve 31 and a feed valve 41 that cooperate with them. In the water circulation of the anaerobic treatment device, closing the feed valve 41 and opening the sewage return valve 31 can prevent the filler in the methane reaction zone from entering the hydrolysis reaction zone. By opening the feed valve 41 and closing the sewage return valve 31, the filler in the methane reaction zone can quickly enter the hydrolysis reaction zone.

[0084] One end of the feeding device 30 extends into the methane enhanced reaction zone, and the end of the feeding device 30 is flush with or extends 5-10 cm below the connection between the filler delivery pipe 4 and the methane production reactor. This length allows the nano iron water treatment filler entering the methane reaction zone to slowly fall and scatter on the grid C23. The slow fall of nano zero-valent iron can, on the one hand, prolong the contact time between the filler and the sewage; on the other hand, it can also prevent the filler from being scattered too concentratedly on a small area on the upper surface of the grid C23, and can make the filler evenly distributed on the upper surface of the grid C23, which is also conducive to the coordination with the water distribution pipe 24, increasing the contact area between the filler and the sewage.

[0085] Example 3

[0086] The anaerobic device for treating fillers with nano iron water of this embodiment has a cross-sectional shape of a trapezoid, and its trapezoidal side is at an angle of 20-45 degrees with the inner wall of the hydrolysis reactor 10. After the filler falls into the filler crushing area, a flow pusher 16 is provided in the filler crushing area, and the filler is crushed by increasing the power of the flow pusher 16. The filler in the crushing state is in a raised state in the filler crushing area, and the filler in the raised state can be lifted out from the trapezoidal side of the grille E15, and the trapezoidal side is at an angle of 20-45 degrees with the inner wall of the hydrolysis reactor 10. The area of ​​the filler lifted out from both sides is increased, which improves the efficiency of the crushed filler falling out of the grille E15.

[0087] Example 4

[0088] In the anaerobic device for treating fillers with nano iron water of this embodiment, the water distribution pipe 24 is connected to the circulation pump 51 through the water circulation pipe 5, and the water outlet holes 241 provided in the water distribution pipe 24 are arranged alternately up and down, and the aperture of the water outlet holes 241 gradually decreases along the water inlet direction. Because the water distribution pipe 24 is provided with a plurality of water outlet holes 241 arranged alternately up and down, the water flow pressure at the water outlet hole 241 closer to the water circulation pipe 5 will be greater, and conversely, the water flow pressure at the water outlet hole 241 farther from the water circulation pipe 5 will be smaller. If the water outlet holes 241 of the same size are provided on the water distribution pipe 24, the water flow rate of the water flowing out of the water outlet hole 241 closer to the circulation pipe will be faster, and the flow rate of the water flowing out of the water outlet hole 241 farther away will be slower, which will reduce the efficiency of the filler in the methane enhanced reaction zone.

[0089] Under the same water pressure, the larger the aperture of the water outlet hole 241, the lower the height of the water outlet from the aperture. On the contrary, the smaller the aperture, the higher the height of the water outlet from the aperture. The design of the aperture of the water outlet hole 241 gradually reducing along the water inlet direction can ensure that the water outlet heights of the water outlet holes 241 in the water distribution pipe 24 are basically the same, which is conducive to improving the reaction efficiency of the filler in the methane zone. The spacing of the water outlet holes 241 of this embodiment is preferably 20 to 100 mm, and the aperture of the water outlet hole 241 is preferably 5 to 10 mm.

[0090] The angle between the water outlet direction of the water outlet hole 241 of the water distribution pipe 24 of this embodiment and the water inlet direction of the water distribution pipe 24 gradually changes from 60 degrees to 120 degrees. This design enables the water outlet hole 241 to have different water outlet directions. The water outlet direction at the middle position of the water distribution pipe 24 is basically perpendicular to the water distribution pipe of the water distribution pipe 24, and the water outlet direction is basically vertically upward. The water outlet directions of the water outlet holes 241 on both sides have a certain inclination angle, so that the water outlet of the water outlet hole 241 can cover a larger range, which is conducive to improving the utilization efficiency of the filler.

[0091] Example 5

[0092] This embodiment provides a control method for an anaerobic device applicable to nano iron water treatment filler in the above embodiment, comprising the following steps:

[0093] The first step is feeding, feeding the nano iron water treated filler into the methanogenic reactor 20 through the feeding device 30, regulating the circulating pump 51, so that the hydraulic rising flow rate of the methanogenic reactor 20 maintains normal operation, and the rising flow rate is preferably controlled to 3~5m / h, and it runs for 30~60 days. According to the different schemes of the isolation device adopted, when the isolation device adopts scheme one, by regulating the circulating pump 51, closing the feed valve 41, and opening the sewage return valve 14, the filler is allowed to work in the methanogenic reactor 20, so that it cannot enter the hydrolysis reactor 10. When the scheme two or three of the isolation device is adopted, the feed valve 41 is always open, and the height of the grid B22 is adjusted to be lower than the height of the filler delivery pipe 4 connected to one end of the methanogenic reactor 20, or the hole grid is closed to control the nano iron water treated filler to work in the methanogenic reactor 20.

[0094] Step 2: Transferring materials. When more than 80% of the fillers in the methanogenic reactor 20 are purple and / or brown, the circulation pump 51 is regulated to make the hydraulic rising flow rate reach 10-20 m / h for 1-3 hours to transfer the fillers to the hydrolysis reactor 10. After the fillers are transferred, the circulation pump 51 is regulated to restore the hydraulic rising flow rate to 1-3 m / h to maintain the normal operation of the methanogenic reactor 20.

[0095] When the isolation device is adopted in scheme 1, the sewage return valve 31 is closed, and the feed valve 41 is opened to make the hydraulic rising flow rate reach 10-20 m / h, which lasts for 1-3 hours, so that the filler is transferred to the hydrolysis reactor 10. After the filler is transferred, the feed valve 41 is closed and the sewage return valve 31 is opened to maintain the normal operation of the methanogenic reactor 20; when the isolation device is adopted in scheme 2 or 3, the feed valve 41 is always opened, and the height of the grid B22 is adjusted to be higher than the height of the end of the filler delivery pipe 4 connected to the methanogenic reactor 20, or the perforated grid is opened to transfer the filler to the hydrolysis reactor 10. After the nano-iron water treated filler is transferred, the height of the grid B22 is adjusted to be lower than the height of the end of the filler delivery pipe 4 connected to the methanogenic reactor 20, or the perforated grid is closed.

[0096] Step 3: Cut the material and observe the color change of the filler in the hydrolysis reaction zone. When more than 80% of the filler is dark purple and / or dark brown, open the grid A14, close the flow pusher 16, and let it stand for 5 to 10 minutes. The filler enters the grid E15, close the grid A14, increase the speed of the flow pusher 16, and cut the filler entering the grid E15. The broken filler passes through the grid E15 and is transported to the methanogenic reactor 20 by the circulation pump 51.

[0097] Step 4: Sludge discharge. Observe that the granular sludge area increases to the screen C23, open the sludge discharge valve 61, and discharge granular sludge of 10% to 30% of the volume of the sludge granular area.

[0098] Other operating control parameters of the methanogenic enhanced reactor 20 in this embodiment are as follows: pH value 6.5-7.8, preferably 6.8-7.2, volumetric load 10-20 kgCOD / (m³·d), and temperature 20-35°C.

[0099] Other operating control parameters of the hydrolysis enhancement reactor 10 in this embodiment are: pH value 6.2~7.0, preferably 6.3~6.6, volume load 2~3kgCOD / (m³·d), temperature 20~35°C.

[0100] Example 6

[0101] The present embodiment provides a nano iron water treatment filler for use in an anaerobic device and a method for manufacturing the same. The nano iron water treatment filler of the present embodiment, combined with the anaerobic device and device control method suitable for the nano iron water treatment filler of the above-mentioned embodiment, will more effectively solve the problems of sludge mineralization and toxicity, and weak methane production capacity generated by the anaerobic treatment device during the treatment of organic pollutants.

[0102] This embodiment relates to a method for manufacturing a composite nano iron water treatment filler, which includes steps S10-S40:

[0103] S10 Preparation of nano zero-valent iron turbid solution: Add a certain weight of nano zero-valent iron into the dispersant solution, and stir to obtain a uniformly dispersed nano zero-valent iron turbid solution. Nano zero-valent iron is a conventional product that can be purchased from the market, and the dispersant solution includes water, starch, dextrin, acetylacetone and ascorbic acid. Among them, the weight proportion of the dispersant composition is preferably: 85-95 parts of water, 3-8 parts of starch, 0.5-1 parts of dextrin, 1-5 parts of acetylacetone, and 0.5-1 parts of ascorbic acid.

[0104] S20 Preparation of gel-like substance: Add polyvinyl alcohol, sodium alginate, carboxymethyl cellulose, ethylenediaminetetraacetic acid, and EPS-microbial agent into water and stir until a uniform paste is formed to form a gel-like substance. Polyvinyl alcohol, sodium alginate, carboxymethyl cellulose, and ethylenediaminetetraacetic acid can all be purchased from the market. The weight composition of the gel-like substance is preferably 10-20 parts of polyvinyl alcohol, 5-10 parts of sodium alginate, 4-8 parts of carboxymethyl cellulose, 6-12 parts of EDTA, and 50-75 parts of EPS-microbial agent. Among them, EPS-microbial agent is composed of EPS and microbial liquid in a weight ratio of 1:50, and the number of colonies of the microbial liquid is 1×10 9 ~1×10 10 cfu / mL, the bacterial solution is rich in nutrients required by microorganisms and trace elements such as Zn, Mn, Co, Ni, Mo, and Se, and the water temperature is preferably 50-60°C for 10-30 minutes. The types of microorganisms in the bacterial solution are preferably one or more of hydrolytic bacteria, fermentative bacteria, acetic acid bacteria, and methanogens.

[0105] S30: Add the nano zero-valent iron turbid liquid prepared in step S10 to the gel-like substance prepared in step S20, and after fully stirring, form a gel-like substance containing the nano zero-valent iron turbid liquid, add a lightweight porous sponge material, and adsorb the gel-like substance containing the nano zero-valent iron turbid liquid on the sponge by squeezing and releasing. The porous sponge material has an appearance of a sphere, a cuboid, a cube, a prism, etc., preferably a cube and a sphere, and cube and spherical particles can also be added at the same time. The pore size of the porous sponge material is preferably 20~30PPI, the side length of the cube particles and the diameter of the sphere are preferably 8~10mm, and the density is 0.5~0.7g / cm³.

[0106] S40: The adsorbed sponge material is added to a saturated boric acid solution containing 2% to 3% calcium chloride to harden and crosslink for 10 to 20 hours to prepare a nano iron water treatment filler.

[0107] In the above steps S10 to S40, nitrogen is continuously introduced for protection during the preparation of the dispersant solution, the nano-zero-valent iron turbid solution, and the gel material, and the water solvent used in the preparation of the dispersant solution and the nano-zero-valent iron turbid solution must be stripped with nitrogen to remove the dissolved oxygen in the water.

[0108] The composite nano zero-valent iron manufacturing method of this embodiment uses the nano zero-valent iron in the nano iron turbid solution in step S10 as the composite material body, wherein starch and dextrin are used as nano iron dispersants to evenly disperse the nano iron. Since nano zero-valent iron has strong reducibility and poor stability, it is not conducive to storage. Ascorbic acid and dispersants are used as nano iron protective agents to prevent it from being oxidized during the preparation process. Acetylacetone is used as a composite material loss indicator. With the long-term use of the nano zero-valent iron composite material, the color of the material gradually deepens, and the material is evaluated to enter the next system for reuse.

[0109] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. An anaerobic device suitable for treating nano iron water fillers, comprising a hydrolysis reactor (10) and a methanogenic reactor (20), wherein the hydrolysis reactor (10) and the methanogenic reactor (20) are connected in water by a water circulation pipe (5) and a circulation pump (51), and in gaseous communication by a gas transport connecting pipe (7), characterized in that: It also includes a feeding device (30), a filler conveying pipe (4) and an isolation device; The hydrolysis reactor (10) is provided with a water inlet distribution pipe (13), a grid A (14) and a grid E (15) in order from top to bottom, a flow pusher (16) is provided between the grid A (14) and the grid E (15), and the grid A (14) can be opened and closed; The methane-producing reactor (20) is provided with a feeding device (30), a grid C (23) and a water distribution pipe (24) in order from top to bottom, and the bottom of the methane-producing reactor (20) is connected to a mud discharge pipe (6); The feeding device (30) is used to feed fillers into the methane production reactor (20); The filler delivery pipe (4) is used to deliver the filler in the methanogenic reactor (20) to the hydrolysis reactor (10); The isolation device is used to control the flow area of ​​the nano-iron water treatment filler in the methanogenic reactor (20); The isolation device comprises a grid B (22) and a sewage return pipe (3), wherein the grid B (22) is arranged in the methanogenic reactor (20), and the grid B (22) is located on the upper side of the grid C (23); the sewage return pipe (3) has one end connected to the methanogenic reactor (20) at a level higher than the level of the grid B (22), and the other end is connected to the hydrolysis reactor (10); a methanogenic reaction zone is formed between the grid B (22) and the grid C (23), and the feeding device (30) feeds filler into the methanogenic reaction zone; The isolation device comprises a grid B (22), a guide rail (25) and a pull rope B (221); the guide rail (25) is arranged on the inner wall of the methanogenic reactor (20) and is located on the upper side of the grid C (23); the grid B (22) slides up and down along the guide rail (25) through the pull rope B (221); the filler conveying pipe (4) is connected to one end of the methanogenic reactor (20) and is within the horizontal height range of the guide rail (25); A filler crushing zone is formed between the grid A (14) and the grid E (15), and the cross-sectional shape of the grid E (15) is a trapezoid, and the side of the trapezoid forms an angle of 20 to 45 degrees with the inner wall of the hydrolysis reactor (10); A grid D (12) is provided on the upper side of the water inlet distribution pipe (13) in the hydrolysis reactor (10), and a hydrolysis reaction zone is formed between the grid A (14) and the grid D (12); The grid A (14), grid C (23) and grid D (12) are grid plates with a hole diameter of 5-8 mm, and the grid E (15) is a grid plate with a hole diameter of 3-4 mm.

2. The anaerobic device for treating nano iron water filler according to claim 1, characterized in that: The horizontal height of the end of the filler delivery pipe (4) connected to the hydrolysis reactor (10) is lower than the horizontal height of the end connected to the methanogenic reactor (20).

3. The anaerobic device for treating nano iron water filler according to claim 2, characterized in that: The angle between the filler conveying pipe (4) and the horizontal plane is 20 to 30 degrees.

4. The anaerobic device for treating nano iron water filler according to claim 1, characterized in that: The water distribution pipe (24) is connected to the water circulation pipe (5), the water outlet holes (241) provided on the water distribution pipe (24) are arranged alternately up and down, and the apertures of the water outlet holes (241) gradually decrease along the water inlet direction.

5. The anaerobic device for treating nano iron water filler according to claim 4, characterized in that: The angle between the water outlet direction of the water outlet hole (241) of the water distribution pipe (24) and the water inlet direction of the water outlet pipe (242) of the water distribution pipe (24) gradually changes from 60 degrees to 120 degrees, the aperture of the water outlet hole (241) is 5 to 10 mm, and the spacing between the water outlet holes (241) is 20 to 100 mm.

6. The anaerobic device for treating nano iron water filler according to claim 1, characterized in that: The hydrolysis reactor (10) and the methanogenic reactor (20) are connected via a three-phase separator gas delivery pipe (2); a three-phase separator A (11) and a three-phase separator B (21) are arranged in the methanogenic reactor (20); the levels of the three-phase separator A (11) and the three-phase separator B (21) are higher than the level of the sewage return pipe (3); and the gas collecting chambers of the three-phase separator A (11) and the three-phase separator B (21) are connected to the three-phase separator gas delivery pipe (2).

7. The anaerobic device for treating nano iron water filler according to claim 1, characterized in that: The feeding device (30) comprises a feeding port (301), a feeding pipe (302), a floating ball (303), a pulling rope (304), a roller (305) and a bracket (306); the feeding port (301) is funnel-shaped and connected to the feeding pipe (302); the pulling rope (304) is connected to the floating ball (303); the pulling rope (304) is wound around the roller (305) and then led out from the feeding port (301); the roller (305) is placed on the bracket (306), and the bracket (306) is fixed in the methane production reactor (20).

8. The anaerobic device for treating nano iron water filler according to any one of claims 1 to 7, characterized in that: The nano iron water treatment filler is prepared from nano zero-valent iron, dispersant solution, indicator, gel, and lightweight porous sponge. The nano iron water treatment filler is square and / or spherical porous particles with a filler density of 0.98-1.15 g / cm 3 .

9. The control method of the anaerobic device suitable for nano iron water treatment filler according to any one of claims 1 to 7, characterized in that: The steps include: The first step is feeding, feeding the nano iron water treated filler into the methanogenic reactor (20) through the feeding device (30), regulating the circulation pump (51) so that the hydraulic rising flow rate of the methanogenic reactor (20) maintains normal operation, and the rising flow rate is preferably controlled at 3-5 m / h, and the operation lasts for 30-60 days; Step 2: Transferring materials. When more than 80% of the fillers in the methanogenic reactor (20) are purple and / or brown, the circulation pump (51) is regulated to make the hydraulic rise velocity reach 10-20 m / h for 1-3 hours, so that the nano iron water treated fillers are transferred to the hydrolysis reactor (10) through the filler delivery pipe (4). After the fillers are transferred, the circulation pump (51) is regulated to restore the hydraulic rise velocity to 1-3 m / h to maintain the normal operation of the methanogenic reactor (20); Step 3: Cutting. When more than 80% of the fillers in the hydrolysis reactor (10) are dark purple and / or dark brown, the speed of the flow propeller (16) is increased to cut the nano iron water treated fillers. The broken fillers pass through the grid E (15) and are transported to the methanogenic reactor (20) by the circulation pump (51); Step 4: Sludge discharge: the granular sludge is discharged through the sludge discharge pipe (6).

10. The control method of the anaerobic device applicable to nano iron water treatment filler according to claim 9, characterized in that: The operation control parameters of the methanogenic reactor (20) in the first to fourth steps are: pH value 6.5-7.8, volumetric load 10-20 kg COD / (m³·d), temperature 20-35°C; the operation control parameters of the hydrolysis reactor (10) in the first to fourth steps are: pH value 6.2-7.0, volumetric load 2-3 kg COD / (m³·d).

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