A sewage denitrification and denitrification device and treatment method thereof

Abstract

The present invention provides a sewage denitrification and denitrification device, comprising a device body, wherein the device body is sequentially divided into an inlet area, a denitrification area and an outlet area from top to bottom. The denitrification area is provided with a supporting layer and a composite filter material layer, wherein the supporting layer is arranged at the bottom of the composite filter material layer, and the composite filter material layer comprises N layers of denitrification modules from top to bottom, wherein N is a natural number greater than 1. The denitrification module comprises a plurality of spherical skeletons, a plurality of denitrification carriers, a plurality of polyurethane foam blocks and a plurality of root bundle-like fiber bodies, wherein the two ends of the bundle-like fiber bodies are respectively connected by spherical skeletons, the interior of the spherical skeleton is hollow, and the denitrification carrier and the polyurethane foam block are arranged inside the spherical skeleton to have a certain protective effect on the denitrification carrier, thereby preventing the denitrification carrier from being damaged by water flow scouring and increasing the difficulty of sewage treatment. At the same time, the ratio of the denitrification carrier and the polyurethane foam block in the spherical skeleton is reasonably matched, so that the buoyancy of the denitrification module can be flexibly adjusted, and all the denitrification modules can be prevented from being piled up together.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage denitrification and denitrification device and a treatment method thereof. Background Art

[0002] In recent years, with the rapid development of industrialization, the discharge of industrial nitrogen-containing wastewater has continued to increase. Because nitrogen pollution can cause health risks such as teratogenicity, carcinogenicity, and mutagenicity to humans, nitrogen pollution control has received more attention. How to develop economical and efficient methods to remove nitrogen pollution in water bodies has become a hot spot and difficulty in the field of water pollution control. At present, the treatment technologies for nitrogen-containing wastewater include traditional denitrification technologies and new denitrification technologies. Traditional denitrification technologies include physical and chemical methods such as adsorption, catalytic oxidation, and supercritical water oxidation, as well as A / A / O, oxidation ditch, SBR, and biological rotary disc. New biological denitrification technologies include anaerobic ammonia oxidation, short-range nitrification and denitrification, immobilization technology, and simultaneous nitrification and denitrification.

[0003] Heterotrophic biological denitrification technology relies on external organic matter as a substrate for denitrification. Heterotrophic biological denitrification is greatly affected by the environment during denitrification. For example, insufficient carbon sources and low temperatures in winter affect the efficiency of denitrification and denitrification, causing instability in the total nitrogen in the effluent. If a certain amount of carbon source is added, there is a risk of secondary pollution and increased operating costs. The amount of sludge in the autotrophic denitrification process is small, and no additional organic carbon source is required. This method is economical and simple, and is a more ideal denitrification treatment method. Because sulfur is abundant in the earth's crust, widely available, and low-cost, and the sulfur autotrophic denitrification process has low sludge production and high activity, it has stronger adaptability than other autotrophic denitrification processes, so it has higher process feasibility. Sulfur autotrophic denitrification refers to the process in which sulfur autotrophic denitrifying bacteria use reduced sulfur or sulfide as electron donors to perform denitrification in anoxic or anaerobic environments. However, sulfur autotrophic denitrification is an acid-producing process. Long-term operation will reduce the pH of the system, leading to nitrite accumulation, affecting the stable operation of the system. The problem of excessive sulfate in the effluent has also always restricted the development of this technology. Combining sulfur autotrophy with heterotrophic denitrification, on the one hand, because heterotrophic denitrification is an alkali-producing process, it can ensure the relative stability of the pH of the system; on the other hand, the participation of heterotrophic denitrification also reduces the concentration of sulfate in the effluent. The denitrification process of sulfur autotrophic denitrification requires the consumption of reduced sulfur. For the sake of safety and ease of process control, sulfur sources in the form of elemental sulfur are often used. Sulfur is used as the main material to prepare denitrification carriers and put them into the denitrification system. The carriers play the role of reduced sulfur sources and microbial carriers at the same time. Common denitrification devices often directly pile up the denitrification carrier inside the deammonification device. The carrier reaction area is small, which is not conducive to the attachment of microorganisms. In addition, the carrier is not strong enough and is easily crushed by the impact of water flow, which increases the difficulty of treatment.

[0004] In this regard, a sewage denitrification and denitrification device and a treatment method thereof are proposed to achieve economical, efficient and stable denitrification biological denitrification and improve sewage treatment efficiency and treatment quality. Summary of the invention

[0005] In view of the above-mentioned existing problems, the present invention proposes a sewage denitrification and denitrification device and a treatment method thereof, optimizes the denitrification device, optimizes the denitrification carrier in the packing layer, and improves the sewage treatment efficiency and treatment quality of the denitrification device.

[0006] To achieve the above-mentioned purpose, the present invention provides a sewage denitrification and denitrification device, including a device body, which is divided into a water inlet area, a denitrification area and a water outlet area from top to bottom. A main water distribution tank is provided on the top of the device body, and the main water distribution tank is connected to the water inlet area through a water distribution pipe. A water distribution tank is provided in the water inlet area, and a backwash drain pipe is provided on the side wall of the device body, and the water distribution tank is connected to the backwash drain pipe. The water outlet area is provided with a backwash water inlet pipe, a backwash air inlet pipe and a water outlet pipe, the backwash water inlet pipe and the backwash air inlet pipe are arranged on the same side wall of the device body, and the backwash air inlet pipe is arranged on the lower side of the backwash water inlet pipe, and the water outlet pipe is arranged on the other side wall opposite to the device body. The denitrification area is provided with a supporting layer and a composite filter material layer, the supporting layer is arranged at the bottom of the composite filter material layer, and the composite filter material layer includes N layers of denitrification modules from top to bottom, and N is a natural number greater than 1. The denitrification module includes a plurality of spherical skeletons, a plurality of denitrification carriers, a plurality of polyurethane foam blocks and a plurality of bundled fiber bodies, the two ends of the bundled fiber bodies are connected to the spherical skeletons respectively, the interior of the spherical skeleton is hollow, the denitrification carriers and the polyurethane foam blocks are arranged inside the spherical skeleton, and the number ratio of the denitrification carriers and the polyurethane foam blocks inside each spherical skeleton is x:y, and x and y are both non-negative numbers;

[0007] When N=2, x:y in the first-layer denitrification module or the second-layer denitrification module is 1:0;

[0008] When N=3, the x:y ratio of the first-layer denitrification module is 1:2, the x:y ratio of the second-layer denitrification module is 1:1, and the x:y ratio of the third-layer denitrification module is 1:0.

[0009] When N=4, the x:y ratio of the first-layer denitrification module is 1:3, and the x:y ratio of the second-layer denitrification module is 1:2; the x:y ratio of the third-layer denitrification module is 1:1, and the x:y ratio of the fourth-layer denitrification module is 1:0;

[0010] When N=5, the x:y ratio of the first-layer denitrification module is 1:4, and the x:y ratio of the second-layer denitrification module is 1:3; the x:y ratio of the third-layer denitrification module is 1:2, the x:y ratio of the fourth-layer denitrification module is 1:1, and the x:y ratio of the fifth-layer denitrification module is 1:0;

[0011] When N=6, the x:y of the first-layer denitrification module or the second-layer denitrification module is 1:4, the x:y of the third-layer denitrification module is 1:3, the x:y of the fourth-layer denitrification module is 1:2, the x:y of the fifth-layer denitrification module is 1:1, and the x:y of the sixth-layer denitrification module is 1:0.

[0012] Preferably, when N>6, the x:y of the 1st denitrification module or the 2nd denitrification module is 1:4, the x:y of the 3rd denitrification module or the 4th denitrification module is 1:3, the x:y of the 5th denitrification module or the 6th denitrification module is 1:1, and the x:y of the 7th denitrification module to the Nth denitrification module is 1:0.

[0013] Preferably, the denitrification carrier is formed by mechanically pressing 60% elemental sulfur particles, 20% iron-carbon composite particles and 20% activated carbon particles.

[0014] Preferably, the particle size of the elemental sulfur particles is 5-8 mm, the particle size of the iron-carbon composite particles is 6-10 mm, and the particle size of the activated carbon particles is 5-8 mm.

[0015] Preferably, the bundled fiber body comprises a plurality of fiber filaments, and the diameter of the fiber filaments is 5-15 mm.

[0016] Preferably, the spherical skeleton includes a first hemispherical skeleton and a second hemispherical skeleton, the first hemispherical skeleton and the second hemispherical skeleton are detachably connected, and the spherical surface areas of the first hemispherical skeleton and the second hemispherical skeleton are both provided with through holes, and the through holes are used for water to enter and exit the spherical skeleton.

[0017] Preferably, the first hemispherical skeleton and the second hemispherical skeleton are snap-connected or threadedly connected.

[0018] Preferably, the method for making the denitrification module comprises the following steps:

[0019] S1. Make two symmetrical hemispherical molds, the inner arc surface of the hemispherical mold is provided with a protruding piece in the shape of a through hole, pour the castable into the two hemispherical molds, cool and shape them, and then demold them to obtain a first hemispherical skeleton and a second hemispherical skeleton, wherein the castable is a polyurethane material;

[0020] S2. Arrange several first hemispherical skeletons in a straight line, place the two ends of the bundled fiber body in two adjacent first hemispherical skeletons respectively, then put the denitrification carrier and the polyurethane foam block into the first hemispherical skeleton in proportion, and at the same time place the second hemispherical skeleton on top of the first hemispherical skeleton, and then symmetrically fasten the first hemispherical skeleton and the second hemispherical skeleton into one to obtain a denitrification module.

[0021] Preferably, the supporting layers are, from top to bottom, a first pebble layer, a sponge iron layer and a second pebble layer, the pebble particle size in the first pebble layer and the second pebble layer is 15-30 mm, the porosity of the first pebble layer and the second pebble layer is 30-40%, the height of the first pebble layer is 2-5 cm, and the height of the second pebble layer is 5-10 cm; the sponge iron layer is composed of sponge iron and quartz sand, the sponge iron and the quartz sand are mixed in a mass ratio of 1:2, the sponge iron particle size is 3-4 mm, and the quartz sand particle size is 4-8 mm.

[0022] The present invention also proposes a sewage denitrification and denitrification treatment system, which comprises M groups of the above-mentioned device bodies, regulating water tanks, backwash fans, backwash pumps, clean water tanks and backwash water temporary storage tanks, where M is a natural number greater than 1; the M groups of device bodies are arranged in parallel, the M groups of device bodies distribute water through the main water distribution tank, the regulating water tank is connected to the main water distribution tank, the outlet pipe of each device body is connected to the clean water tank, the clean water tank is provided with a first water outlet and a second water outlet, the first water outlet is connected to the outside for discharging treated water, the second outlet is connected to the backwash inlet pipe of each device body through the backwash pump; the backwash drain pipe of each device body is connected to the backwash water temporary storage tank, the backwash water temporary storage tank is provided with a third water outlet, and the third water outlet is connected to the regulating water tank; the backwash fan is connected to the backwash air inlet pipe of each device body.

[0023] Beneficial effects of the present invention: A sewage denitrification and denitrification device provided by the present invention, by arranging a multi-layer denitrification module in the denitrification zone, the denitrification module includes a spherical skeleton, a denitrification carrier, a polyurethane foam block and a bundled fiber body, and the denitrification carrier and the polyurethane foam block are placed inside the spherical skeleton, which can play a certain protective effect on the denitrification carrier, and can prevent the water flow from scouring and causing the denitrification carrier to be damaged, which increases the difficulty of sewage treatment; in addition, according to the different layers of the denitrification module, the ratio of the denitrification carrier and the polyurethane foam block in the spherical skeleton is reasonably proportioned, and the buoyancy of the denitrification module can be flexibly adjusted to avoid all the denitrification modules from piling up together. The polyurethane foam block of the denitrification module in the upper layer accounts for a large proportion, which can provide a large buoyancy to make the denitrification module float in the water body, and also has a certain stirring effect, increases the contact surface of the reaction, and has a promoting effect on improving the denitrification efficiency. The spherical skeletons are connected by bundled fiber bodies, which are conducive to the formation of biofilms, can be attached by microorganisms, and can promote sewage denitrification. At the same time, the bundled fiber body can also wrap some impurities in the sewage, and reduce the impurities in the water body, which is conducive to the smooth progress of denitrification. Further, a supporting layer is also provided in the denitrification zone, and the supporting layer is sequentially a first pebble layer, a sponge iron layer, and a second pebble layer, which can play a role in secondary filtration of sewage. At the same time, the sponge iron has an oxygen removal function, which can effectively eliminate the dissolved oxygen in the incoming water, promote the formation of anoxic / anaerobic environment, and promote the rapid start of denitrification. In addition, the denitrification carrier used in the present invention is composed of elemental sulfur particles, iron-carbon composite particles and activated carbon. In combination with sponge iron, sulfur autotrophic denitrification and iron autotrophic denitrification can be achieved during the reaction process, and sulfur-iron composite autotrophic denitrification deep denitrification can be achieved. At the same time, combined with carbon-iron micro-electrolysis, it can also play a certain phosphorus removal effect. Further, the denitrification carrier also contains an appropriate amount of activated carbon, which can slowly release inorganic carbon sources in the component during the treatment process to achieve a small amount of heterotrophic denitrification.

[0024] The present invention also proposes a sewage denitrification and denitrification treatment system. By connecting the device bodies of multiple groups of sewage denitrification and denitrification devices in parallel, sewage can be treated simultaneously to improve sewage treatment efficiency. The backwash water used by each device body comes from a clean water tank, and the sewage discharged by backwashing is circulated to a regulating water tank again through a backwash water temporary storage tank, thereby realizing the recycling of the entire sewage treatment, and the sewage treatment is efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the sewage denitrification and denitrification device of the present invention;

[0026] Figure 2 It is a schematic structural diagram of the spherical skeleton of the present invention.

[0027] Figure 3 It is a schematic diagram of the process of the sewage denitrification and denitrification treatment system of the present invention.

[0028] in:

[0029] 1-device body, 2-denitrification zone, 201-spherical skeleton, 202-bundled fiber body, 2011-first hemispherical skeleton, 2012-second hemispherical skeleton, 2013-through hole, 3-first pebble layer, 4-sponge iron layer, 5-second pebble layer, 6-backwash water inlet pipe, 7-backwash air inlet pipe, 8-main water distribution tank, 9-water distribution pipe, 10-water distribution tank, 11-backwash drain pipe, 12-water outlet pipe. DETAILED DESCRIPTION

[0030] To further describe the present invention in detail, the following is an explanation with reference to the accompanying drawings. It is particularly noted that the embodiments described below are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figure 1 and Figure 2 The present invention provides a sewage denitrification and denitrification device, including a device body 1, wherein the device body 1 is composed of a water inlet area, a denitrification area 2 and a water outlet area from top to bottom. A main water distribution tank 8 is provided on the top of the device body 1, and the main water distribution tank 8 is connected to the water inlet area through a water distribution pipe 9 for reasonable distribution of sewage. Usually, multiple device bodies 1 are arranged in parallel, and the water inlet areas of multiple device bodies 1 are connected to the main water distribution tank 8, and the main water distribution tank 8 reasonably distributes sewage to each device body 1 according to actual conditions. A water distribution tank 10 is provided in the water inlet area for stabilizing the liquid level in the device, and a backwash drain pipe 11 is provided on the side wall of the device body 1, and the water distribution tank 10 is connected to the backwash drain pipe 11. The water outlet area is provided with a backwash water inlet pipe 6, a backwash air inlet pipe 7 and a water outlet pipe 12. The backwash water inlet pipe 6 and the backwash air inlet pipe 7 are arranged on the same side wall of the device body 1 and the backwash air inlet pipe 7 is arranged on the lower side of the backwash water inlet pipe 6. The water outlet pipe 12 is arranged on the other side wall of the device body 1. Furthermore, the water distribution pipe 9 and the water outlet pipe 12 are both provided with a flow meter and a TN detector. By backwashing regularly (about once every 2-3 days), aged bacteria and dirt can be removed, and the filler in the deammonification zone can be stirred to ensure that the filler is fully utilized. Backwash gas intensity 10-17L / (m 2 ·s), backwash water intensity 8-11L / (m 2 ·s); when the difference between the level of the water to be filtered and the level of the water distribution tank 10 in the device is less than 100-150mm, it indicates that blockage occurs inside the device, the treatment efficiency is reduced, and backwashing is started; or when the filtration cycle exceeds 72h, backwashing is started.

[0033] The denitrification zone 2 is provided with a supporting layer and a composite filter material layer, wherein the supporting layer is provided at the bottom of the composite filter material layer, and the composite filter material layer includes N layers of denitrification modules from top to bottom, where N is a natural number greater than 1. The denitrification module includes a plurality of spherical skeletons 201, a plurality of denitrification carriers, a plurality of polyurethane foam blocks, and a plurality of bundled fiber bodies 202, wherein the two ends of the bundled fiber bodies 202 are connected to the spherical skeletons 201 respectively, the interior of the spherical skeleton 201 is hollow, the denitrification carriers and the polyurethane foam blocks are provided inside the spherical skeleton 201, and the number ratio of the denitrification carriers and the polyurethane foam blocks inside each spherical skeleton 201 is x:y, and both x and y are non-negative numbers;

[0034] When N=2, x:y in the first-layer denitrification module or the second-layer denitrification module is 1:0;

[0035] When N=3, the x:y ratio of the first-layer denitrification module is 1:2, the x:y ratio of the second-layer denitrification module is 1:1, and the x:y ratio of the third-layer denitrification module is 1:0.

[0036] When N=4, the x:y ratio of the first-layer denitrification module is 1:3, and the x:y ratio of the second-layer denitrification module is 1:2; the x:y ratio of the third-layer denitrification module is 1:1, and the x:y ratio of the fourth-layer denitrification module is 1:0;

[0037] When N=5, the x:y ratio of the first-layer denitrification module is 1:4, and the x:y ratio of the second-layer denitrification module is 1:3; the x:y ratio of the third-layer denitrification module is 1:2, the x:y ratio of the fourth-layer denitrification module is 1:1, and the x:y ratio of the fifth-layer denitrification module is 1:0;

[0038] When N=6, the x:y of the first-layer denitrification module or the second-layer denitrification module is 1:4, the x:y of the third-layer denitrification module is 1:3, the x:y of the fourth-layer denitrification module is 1:2, the x:y of the fifth-layer denitrification module is 1:1, and the x:y of the sixth-layer denitrification module is 1:0.

[0039] When N>6, the x:y of the first-layer denitrification module or the second-layer denitrification module is 1:4, the x:y of the third-layer denitrification module or the fourth-layer denitrification module is 1:3, the x:y of the fifth-layer denitrification module or the sixth-layer denitrification module is 1:1, and the x:y of the seventh-layer denitrification module to the Nth-layer denitrification module is 1:0.

[0040] That is to say, when the composite filter material layer has 8 denitrification modules,

[0041] The first layer of denitrification module, in which the ratio of the number of denitrification carriers and polyurethane foam blocks inside each spherical skeleton 201 is 1:4;

[0042] The second layer of denitrification module, in which the ratio of the number of denitrification carriers and polyurethane foam blocks inside each spherical skeleton 201 is 1:4;

[0043] The third layer of denitrification module, in which the ratio of the number of denitrification carriers and polyurethane foam blocks inside each spherical skeleton 201 is 1:3;

[0044] The fourth-layer denitrification module has a ratio of 1:3 between the denitrification carrier and the polyurethane foam block inside each spherical skeleton 201;

[0045] The fifth layer of denitrification module, in which the ratio of the number of denitrification carriers and polyurethane foam blocks inside each spherical skeleton 201 is 1:1;

[0046] The sixth layer of denitrification module, in which the ratio of the number of denitrification carriers and polyurethane foam blocks inside each spherical skeleton 201 is 1:1;

[0047] The seventh-layer denitrification module has a ratio of 1:0 between the denitrification carrier and the polyurethane foam block inside each spherical skeleton 201, that is, the spherical skeleton 201 is only filled with the denitrification carrier;

[0048] The eighth-layer denitrification module has a ratio of 1:0 between the denitrification carrier and the polyurethane foam block inside each spherical skeleton 201;

[0049] It should be noted that the number of layers of denitrification modules in the device can be selected and arranged according to actual conditions, and the ratio of the number of denitrification carriers and polyurethane foam blocks in the spherical skeleton 201 can also be adjusted according to the actual nitrate nitrogen concentration of the sewage, and technical personnel in this field can freely combine them.

[0050] By properly proportioning the number of denitrification carriers and polyurethane foam blocks in the spherical skeleton 201, the overall buoyancy of the denitrification module can be adjusted to separate each layer of denitrification modules and prevent all denitrification modules from gathering and accumulating at the bottom. At the same time, the upper denitrification module floating in the water can also play a certain stirring effect, promote the flow of water, increase the contact between the denitrification carrier and the water body, and help improve the efficiency of denitrification.

[0051] The denitrification carrier is mechanically pressed from 60% elemental sulfur particles, 20% iron-carbon composite particles and 20% activated carbon particles. The particle size of the elemental sulfur particles is 5-8mm, the particle size of the iron-carbon composite particles is 6-10mm, and the particle size of the activated carbon particles is 5-8mm. The iron-carbon composite particles can be commercially available. The denitrification carrier contains sulfur, carbon and iron elements, and the main reactions during the treatment process are as follows:

[0052] S 0 +1.2NO3 -+0.4H2O→SO4 2- +0.6N2+0.8H +

[0053] 5Fe 0 +2NO3 - +6H2O→5Fe 2+ +N2+12OH -

[0054] Fe+2H2O+PO4 3- →FePO4↓+H2↑+2OH -

[0055] The bundled fiber body 202 includes a plurality of fiber filaments, and the diameter of the fiber filaments is 5-15mm. The fiber filaments can be made of polyester or polypropylene. After a plurality of fiber filaments are bundled into one strand, the fiber filaments at both ends are hot-pressed into one body to obtain the bundled fiber body 202, and the bundled fiber body 202 includes 100-350 fiber filaments. By arranging the bundled fiber body 202 between the two spherical skeletons 201, the fiber filaments float in the water after entering the water body, and can absorb some impurities to improve the quality of the water body. At the same time, the bundled fiber body 202 is used to connect each individual spherical skeleton 201 to form a long string of denitrification modules, which is conducive to the deployment and recovery of the denitrification modules.

[0056] The spherical skeleton 201 includes a first hemispherical skeleton 2011 and a second hemispherical skeleton 2012, the first hemispherical skeleton 2011 and the second hemispherical skeleton 2012 are detachably connected, and the spherical areas of the first hemispherical skeleton 2011 and the second hemispherical skeleton 2012 are both provided with through holes 2013, and the through holes 2013 are used for water to enter and exit the spherical skeleton 201. It should be noted that the width of the through hole 2013 needs to be smaller than the width of the denitrification carrier and the polyurethane foam block to prevent the denitrification carrier and the polyurethane foam block from flowing in through the through hole. The through hole 2013 can be set to a circular or arc shape, and the denitrification carrier and the polyurethane foam block can be set in a sphere or a cylinder.

[0057] The first hemispherical skeleton 2011 and the second hemispherical skeleton 2012 are snap-fitted or threadedly connected.

[0058] The method for making the denitrification module comprises the following steps:

[0059] S1. Making two symmetrical hemispherical molds, the inner arc surface of the hemispherical mold is provided with a protruding piece in the shape of a through hole 2013, pouring the castable into the two hemispherical molds, cooling and shaping, and then demolding to obtain a first hemispherical skeleton 2011 and a second hemispherical skeleton 2012, wherein the castable is a polyurethane material;

[0060] S2. Arrange several first hemispherical skeletons 2011 in a straight line, place the two ends of the bundled fiber body 202 in two adjacent first hemispherical skeletons 2011 respectively, then put the denitrification carrier and the polyurethane foam block into the first hemispherical skeleton 2011 in proportion, and place the second hemispherical skeleton 2012 on top of the first hemispherical skeleton 2011, and then symmetrically fasten the first hemispherical skeleton 2011 and the second hemispherical skeleton 2012 into one to obtain a denitrification module.

[0061] The supporting layers are respectively the first pebble layer 3, the sponge iron layer 4 and the second pebble layer 5 from top to bottom. The particle size of the pebbles in the first pebble layer 3 and the second pebble layer is 15-30mm, the porosity of the first pebble layer 3 and the second pebble layer 5 is 30-40%, the height of the first pebble layer 3 is 2-5cm, and the height of the second pebble layer 5 is 5-10cm; the sponge iron layer 4 is composed of sponge iron and quartz sand, the sponge iron and the quartz sand are mixed in a mass ratio of 1:2, the particle size of the sponge iron is 3-4mm, and the particle size of the quartz sand is 4-8mm. Dividing the supporting layer into three layers can further play a role in secondary filtration of sewage. The sponge iron layer 4 is arranged in the first pebble layer 3 and the second pebble layer 5, which can effectively block the sponge iron particles and prevent them from being washed into the water body discharge device.

[0062] Example 2

[0063] refer to Figure 3 The present invention also proposes a sewage denitrification and denitrification treatment system, which comprises M groups of the above-mentioned device bodies 1, regulating water tanks, backwash fans, backwash pumps, clean water tanks and backwash water temporary storage tanks, where M is a natural number greater than 1; the M groups of device bodies 1 are arranged in parallel, and the M groups of device bodies 1 distribute water through the main water distribution tank 8, the regulating water tank is connected to the main water distribution tank 8, and the outlet pipe 12 of each device body 1 is connected to the clean water tank, and the clean water tank is provided with a first water outlet and a second water outlet, the first water outlet is connected to the outside for discharging treated water, and the second outlet is connected to the backwash inlet pipe 6 of each device body 1 through the backwash pump; the backwash drain pipe 11 of each device body 1 is connected to the backwash water temporary storage tank, and the backwash water temporary storage tank is provided with a third water outlet, and the third water outlet is connected to the regulating water tank; the backwash fan is connected to the backwash air inlet pipe 7 of each device body 1.

[0064] The present invention provides a sewage denitrification and denitrification device, which is provided with multiple layers of denitrification modules and places denitrification carriers on a spherical skeleton. Compared with the common method of directly piling up the denitrification carriers in the packing area, the denitrification carriers are dispersedly arranged, which is more conducive to increasing the contact area of ​​the reaction and positively promoting the reaction. Furthermore, according to the different layers of the denitrification modules, the filling ratio of the denitrification carriers and the polyurethane foam blocks is adjusted, the buoyancy of the denitrification modules in the water body can be adjusted, and the denitrification modules are further dispersed to avoid being piled up at the bottom, which has a better promoting effect on improving the denitrification efficiency.

[0065] The embodiments disclosed above are only for the purpose of describing the present invention in detail, and cannot be used to limit the scope of the present invention. Therefore, simple modifications and changes made according to the scope of the claims of the present invention still belong to the scope of protection of the present invention. The scope of protection of the present invention shall be based on the defined scope. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A sewage denitrification and denitrification device, comprising a device body, wherein the device body is composed of an inlet area, a denitrification area and an outlet area from top to bottom, and is characterized in that: A main water distribution tank is provided outside the top of the device body, and the main water distribution tank is connected to the water inlet area through a water distribution pipe; a water distribution tank is provided in the water inlet area, and a backwash drainage pipe is provided on the side wall of the device body, and the water distribution tank is connected to the backwash drainage pipe; a backwash water inlet pipe, a backwash air inlet pipe and a water outlet pipe are provided in the water outlet area, the backwash water inlet pipe and the backwash air inlet pipe are arranged on the same side wall of the device body and the backwash air inlet pipe is arranged on the lower side of the backwash water inlet pipe, and the water outlet pipe is arranged on the other side wall opposite to the device body; the denitrification area is provided with a supporting layer and a composite A filter material layer, wherein the supporting layer is arranged at the bottom of the composite filter material layer, and the composite filter material layer comprises N layers of denitrification modules from top to bottom, where N is a natural number greater than 1; the denitrification modules comprise a plurality of spherical skeletons, a plurality of denitrification carriers, a plurality of polyurethane foam blocks and a plurality of bundled fiber bodies, wherein both ends of the bundled fiber bodies are connected to the spherical skeletons respectively, the interior of the spherical skeleton is hollow, the denitrification carriers and the polyurethane foam blocks are arranged inside the spherical skeleton, and the number ratio of the denitrification carriers and the polyurethane foam blocks inside each spherical skeleton is x:y, and both x and y are non-negative numbers; When N=2, x:y in the first-layer denitrification module or the second-layer denitrification module is 1:0; When N=3, the x:y ratio of the first-layer denitrification module is 1:2, the x:y ratio of the second-layer denitrification module is 1:1, and the x:y ratio of the third-layer denitrification module is 1:

0. When N=4, the x:y ratio of the first-layer denitrification module is 1:3, and the x:y ratio of the second-layer denitrification module is 1:2; the x:y ratio of the third-layer denitrification module is 1:1, and the x:y ratio of the fourth-layer denitrification module is 1:0; When N=5, the x:y ratio of the first-layer denitrification module is 1:4, and the x:y ratio of the second-layer denitrification module is 1:3; the x:y ratio of the third-layer denitrification module is 1:2, the x:y ratio of the fourth-layer denitrification module is 1:1, and the x:y ratio of the fifth-layer denitrification module is 1:0; When N=6, the x:y of the first-layer denitrification module or the second-layer denitrification module is 1:4, the x:y of the third-layer denitrification module is 1:3, the x:y of the fourth-layer denitrification module is 1:2, the x:y of the fifth-layer denitrification module is 1:1, and the x:y of the sixth-layer denitrification module is 1:0; When N>6, the x:y of the first-layer denitrification module or the second-layer denitrification module is 1:4, the x:y of the third-layer denitrification module or the fourth-layer denitrification module is 1:3, the x:y of the fifth-layer denitrification module or the sixth-layer denitrification module is 1:1, and the x:y of the seventh-layer denitrification module to the Nth-layer denitrification module is 1:

0.

2. The sewage denitrification and denitrification device according to claim 1, characterized in that: The denitrification carrier is formed by mechanically pressing 60% of elemental sulfur particles, 20% of iron-carbon composite particles and 20% of activated carbon particles.

3. The sewage denitrification and denitrification device according to claim 2, characterized in that: The particle size of the elemental sulfur particles is 5-8 mm, the particle size of the iron-carbon composite particles is 6-10 mm, and the particle size of the activated carbon particles is 5-8 mm.

4. The sewage denitrification and denitrification device according to claim 1, characterized in that: The bundled fiber body includes a plurality of fiber filaments, and the diameter of the fiber filaments is 5-15 mm.

5. The sewage denitrification and denitrification device according to claim 4, characterized in that: The spherical skeleton comprises a first hemispherical skeleton and a second hemispherical skeleton, the first hemispherical skeleton and the second hemispherical skeleton are detachably connected, and the spherical surface areas of the first hemispherical skeleton and the second hemispherical skeleton are both provided with through holes, and the through holes are used for water to enter and exit the spherical skeleton.

6. The sewage denitrification and denitrification device according to claim 5, characterized in that: The first hemispherical frame and the second hemispherical frame are snap-connected or threadedly connected.

7. The sewage denitrification and denitrification device according to claim 5, characterized in that: The method for making the denitrification module comprises the following steps: S1. Make two symmetrical hemispherical molds, the inner arc surface of the hemispherical mold is provided with a protruding piece in the shape of a through hole, pour the castable into the two hemispherical molds, cool and shape them, and then demold them to obtain a first hemispherical skeleton and a second hemispherical skeleton, wherein the castable is a polyurethane material; S2. Arrange several first hemispherical skeletons in a straight line, place the two ends of the bundled fiber body in two adjacent first hemispherical skeletons respectively, then put the denitrification carrier and the polyurethane foam block into the first hemispherical skeleton in proportion, and at the same time place the second hemispherical skeleton on top of the first hemispherical skeleton, and then symmetrically fasten the first hemispherical skeleton and the second hemispherical skeleton into one to obtain a denitrification module.

8. The sewage denitrification and denitrification device according to claim 1, characterized in that: The supporting layers are, from top to bottom, a first pebble layer, a sponge iron layer, and a second pebble layer, the particle size of the pebbles in the first pebble layer and the second pebble layer is 15-30 mm, the porosity of the first pebble layer and the second pebble layer is 30-40%, the height of the first pebble layer is 2-5 cm, and the height of the second pebble layer is 5-10 cm; the sponge iron layer is composed of sponge iron and quartz sand, the sponge iron and the quartz sand are mixed in a mass ratio of 1:2, the particle size of the sponge iron is 3-4 mm, and the particle size of the quartz sand is 4-8 mm.

9. A sewage denitrification and denitrification treatment system, characterized in that: The sewage denitrification and denitrification treatment system comprises M groups of device bodies as described in any one of claims 1 to 8, a regulating water tank, a backwash fan, a backwash pump, a clean water tank and a backwash water temporary storage tank, where M is a natural number greater than 1; the M groups of device bodies are arranged in parallel, the M groups of device bodies distribute water through the main water distribution tank, the regulating water tank is connected to the main water distribution tank, the outlet pipe of each device body is connected to the clean water tank, the clean water tank is provided with a first water outlet and a second water outlet, the first water outlet is connected to the outside for discharging treated water, the second water outlet is connected to the backwash inlet pipe of each device body through the backwash pump; the backwash drain pipe of each device body is connected to the backwash water temporary storage tank, the backwash water temporary storage tank is provided with a third water outlet, and the third water outlet is connected to the regulating water tank; the backwash fan is connected to the backwash air inlet pipe of each device body.

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