A salt-containing wastewater treatment device based on sulfur autotrophic denitrification and its use method

Abstract

The present invention belongs to the technical field of wastewater treatment equipment, and discloses a saline wastewater treatment equipment based on sulfur autotrophic denitrification and a method for using the same. The equipment comprises filter material and a filter tank body, wherein the filter tank body is equipped with a supporting assembly, wherein the supporting assembly comprises an external pipe, a middle pipe assembly, a partition structure and a cylinder body, wherein the cylinder body forms a water passage in the filter tank body, wherein the middle pipe assembly is coaxially placed in the cylinder body, and wherein the circumferential side wall of the middle pipe assembly is fixed with multiple groups of partition structures to carry the filter material in layers. Through the arrangement of the supporting assembly, the filter material is placed in layers in the cylinder body, and the temperature control medium enters the middle pipe assembly to heat the filter material so that the microorganisms remain active. Under the action of water pressure, the middle pipe assembly extends and the horizontal annular partition structure expands into a corrugated annular state, providing the filter material with a larger heat exchange contact area and a larger accommodation space to loosen the filter material, so that the filter material is heated simultaneously from the bottom, both sides and the inside, facilitating heat transfer to quickly heat up the filter material.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment equipment, and in particular to a saline wastewater treatment equipment based on sulfur autotrophic denitrification and a use method thereof. Background Art

[0002] High-salt wastewater refers to wastewater with a total salt content of at least 1% by mass, which mainly comes from chemical plants and the collection and processing of oil and natural gas. In the treatment of saline wastewater, efficient evaporation uses multi-effect evaporation equipment, which can partially crystallize and separate the salt in the wastewater and obtain low-carbon-nitrogen ratio wastewater, and then use the denitrification process to treat nitrates or nitrites in the low-carbon-nitrogen ratio wastewater.

[0003] Existing denitrification filters are mainly composed of heterotrophic denitrifying bacteria, which provide electrons by adding carbon sources. Unstable carbon source control will lead to excessively high COD content, affecting the effluent quality. Sulfur autotrophic denitrification filters do not require the addition of carbon sources, and directly provide electrons by hydrolyzing sulfur as filter material. Because sulfur acts as an electron donor, about 30°C is the temperature range for the active reaction between sulfur autotrophic denitrifying bacteria and sulfur. If external factors interfere and cause the temperature to drop significantly, the sulfur element will not be able to be in a suitable temperature state, affecting its speed in providing electrons, resulting in insufficient electrons required for the denitrification reaction, and then causing the denitrification reaction rate of sulfur autotrophic denitrifying bacteria to be slow. Therefore, it is necessary to design a salt-containing wastewater treatment equipment based on sulfur autotrophic denitrification to solve this problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a saline wastewater treatment device based on sulfur autotrophic denitrification and a method of use, which can solve the technical problems in actual production:

[0005] The sulfur element used as the filter material in the sulfur autotrophic denitrification filter cannot be in a suitable temperature state due to the influence of the environment or low-temperature sewage, resulting in poor denitrification reaction efficiency.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a salt-containing wastewater treatment equipment based on sulfur autotrophic denitrification, including filter material and a filter tank body, the salt-containing wastewater is partially removed from the salt by a multi-effect evaporation device, and the resulting low-carbon-nitrogen ratio wastewater is collected by a secondary effluent collection box, and the secondary effluent collection box introduces the secondary effluent to be treated from the outlet trough above the filter tank body into the filter tank body, the filter tank body is built with a bearing component for supporting the filter material, and the sulfur autotrophic denitrifying bacterial film attached to the filter material reacts to denitrify. During the reaction process, the bearing component can change the stacking state of the filter material to improve the denitrification reaction efficiency. The load-bearing component includes an external pipe fitting, a middle pipe assembly, a partition structure and a cylinder. The cylinder forms a water passage in the filter tank body. The middle pipe assembly is coaxially placed in the cylinder. The circumferential side wall of the middle pipe assembly is fixed with multiple groups of partition structures arranged up and down. Filter material is filled between the partition structures. The external pipe fitting inputs a temperature control medium into the middle pipe assembly to increase the temperature of the middle pipe assembly. The continuous input of the temperature control medium causes the middle pipe assembly to stretch. The stretching of the middle pipe assembly drives the partition structures to move away from each other and deform to change the stacking state of the filter material, so as to ensure uniform temperature transfer and keep the microorganisms on the filter material at a suitable reaction temperature.

[0007] Preferably, the middle tube assembly includes a sleeve, the upper half of the sleeve is set as a sliding section, the sleeve and the adjacent sliding section are slidingly connected, a counterweight block is provided on the top of the middle tube assembly, and a heat exchange assembly is connected in series on the external pipe.

[0008] Preferably, the external pipe includes a delivery head and a top sleeve, the middle pipe assembly is located between the delivery head and the top sleeve, and the delivery head is provided with an input channel connected to the middle pipe assembly.

[0009] Preferably, the separation structure includes a nozzle, a winding tube and a partition net. The nozzle is arranged in a circular array in the middle section of the sleeve, and the winding tube is arranged in a circular array at the lower edge of the sleeve. A partition net is connected between the nozzle on the lower sleeve and the winding tube on the upper sleeve.

[0010] Preferably, the end of the winding tube is rotatably connected to a transfer seat, the transfer seat is fixedly connected to the sleeve, and a torsion spring is connected between the winding tube and the transfer seat.

[0011] Preferably, a spray hole is provided on the side wall of the middle tube assembly, a sealing assembly is provided at the position of the spray hole, and the spray hole located at the top of the sliding section is not provided with a sealing assembly. The sliding section is connected to the sleeve to form a water-passing interlayer, and the winding tube is connected to the water-passing interlayer through a hollow adapter seat. A mesh sleeve is provided on the outer side of the winding tube, and a slit is provided on the side wall of the mesh sleeve along the axial direction for the partition net to enter and exit.

[0012] Preferably, fins are embedded in the inner wall of the cylinder, and the state of the fins is changed during the extension and contraction of the middle tube assembly to impact the filter material. The circumferential side wall of the middle tube assembly is fixedly connected to an end ring, and a contact frame is provided at the end ring corresponding to the nozzle. The two ends of the fin are bent toward the middle tube assembly in a relaxed state, and the contact frame contacts the fin before the end ring during the extension and contraction of the middle tube assembly.

[0013] Preferably, the sealing assembly includes a plug, one side of the plug is connected to a bellows via a swing plate, the swing plate is located between the bellows and the plug and a rotating frame is installed therethrough, and the rotating frame is fixedly connected to the middle pipe assembly.

[0014] Preferably, a wedge is provided at one end of the swing plate away from the plug, a spring rack corresponding to the wedge is fixed to the inner wall of the middle tube assembly, a continuous clamping portion and a sliding portion are provided at the contact position between the spring rack and the wedge, a middle hole is opened in the middle of the plug, and a guide hole is provided at one end of the middle hole facing the spray hole.

[0015] Preferably, a method for treating saline wastewater using a saline wastewater treatment device based on sulfur autotrophic denitrification comprises the following steps:

[0016] S1. The saline wastewater is introduced into a multi-effect evaporation device for heating and concentration, and some soluble salts in the saline wastewater are removed by crystallization to form secondary wastewater with a low carbon-nitrogen ratio;

[0017] S2: Low-salt wastewater is introduced into the filter tank body for sulfur autotrophic denitrification. The waste heat generated in the triple-effect evaporator is introduced into the heat exchange component through the pipeline to provide heat for the medium in the external pipe fittings.

[0018] S3. Under low temperature, the medium enters the middle tube assembly, causing it to stretch, driving the annular partition structure to expand into a corrugated annular state, changing the stacking state of the filter material, providing a larger heat exchange contact area and a larger accommodation space for the filter material to make the filter material loose, facilitating heat transfer to heat the sulfur element as the filter material, thereby ensuring that the sulfur autotrophic denitrifying bacteria are in a suitable reaction temperature environment;

[0019] S4: The spacers in the gathered state are stuck together due to deposits and cannot be unfolded. The temperature control medium in the middle pipe assembly will be sprayed from the winding pipe to the wound spacers, so that the spacers are separated smoothly and unfolded in a corrugated ring state.

[0020] S5. The heat of the middle tube assembly is transferred to the partition structure and the cylinder, and then to the relaxed fins, further increasing the thermal contact surface between the fins and the filter media, achieving rapid temperature rise of the filter media.

[0021] S6. In normal wastewater treatment, elemental sulfur, as a filter material, is easily combined with sediment in the sewage and compacted. By providing a backwash medium to the middle tube assembly, the medium is ejected through the nozzle hole to generate a backwash action from the middle tube assembly toward the cylinder, thereby dispersing the elemental sulfur and sediment.

[0022] S7: In the recoil state, the recoil medium enters the middle pipe assembly, causing its internal pressure to increase. The bellows is compressed, and the wedge block overlaps with the clamping part to squeeze the spring frame, causing the plug to quickly separate from the nozzle hole to form a high-pressure horizontal jet. At the same time, the nozzle will flush the filter material concentrated at the nozzle position up and down. After that, the bellows rebounds and cooperates with the sliding connection of the spring frame to slowly move the plug closer to the nozzle hole, giving the middle pipe assembly sufficient time to be compressed downward by the counterweight.

[0023] S8. When the middle tube assembly is released from compression, the torsion spring returns to its original position and rebounds, wrapping the screen around the outside of the winding tube again. The accumulated filter media collapses toward the ends of the fins. The fins are aligned with the nozzles. During the shortening of the middle tube assembly, the filter media that collapses from the nozzles to both sides will fall toward the ends of the fins with greater force.

[0024] S9. As the medium continues to enter the middle pipe assembly, the middle pipe assembly reciprocates and expands, repeatedly flushing the filter media and impacting the fins until the effluent from the filter tank meets the denitrification requirements, and the backwash cleaning is completed;

[0025] S10. The effluent from the filter body enters the sedimentation tank and ozone sterilization tank for subsequent impurity removal and disinfection to meet the emission standards. An exhaust pipe is set on the top of the filter body to release the nitrogen generated by the reaction.

[0026] By adopting the above technical solution, the beneficial effects of the present invention are:

[0027] 1. Through the setting of the bearing assembly, the filter media is placed in layers in the cylinder. The temperature control medium enters the middle tube assembly and heats the filter media. Under the action of water pressure, the middle tube assembly extends and the horizontal annular separation structure expands into a corrugated annular state, which changes the stacking state of the filter media, provides a larger heat exchange contact area and a larger accommodation space for the filter media to make the filter media loose. The solid heat conduction of the bearing assembly and fins is used to heat the filter media from the bottom, both sides and inside at the same time, which facilitates heat transfer and heats the filter media to a temperature range suitable for microbial reaction.

[0028] 2. Through the setting of the plugging component, the medium continues to enter the middle tube component, which will drive the plugging component to open quickly and close slowly due to the change in internal pressure. The separation structure can be flushed at a low temperature to ensure smooth deployment. During the backflushing process of the filter material, the middle tube component reciprocates and expands, generating intermittent jets to flush the filter material horizontally and vertically, while changing the accumulation position of the filter material. The filter material is hit and dispersed in conjunction with the fins that are compressed and released multiple times. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0030] Figure 2 It is a three-dimensional cross-sectional view of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the load-bearing assembly of the present invention;

[0032] Figure 4 is an enlarged cross-sectional view of the lower portion of the load-bearing assembly of the present invention;

[0033] Figure 5 It is an enlarged cross-sectional view of the upper portion of the load-bearing assembly of the present invention;

[0034] Figure 6 for Figure 5 A magnified schematic diagram of point a in the middle;

[0035] Figure 7 It is a schematic diagram of the structure between the middle tube assembly and the winding tube member of the present invention;

[0036] Figure 8 A schematic diagram of the positions of the nozzle hole and the plugging assembly of the present invention in a closed state;

[0037] Figure 9 A schematic diagram of the positions of the middle tube assembly and the plugging assembly of the present invention in an open state;

[0038] Figure 10 It is a three-dimensional schematic diagram of the middle tube assembly of the present invention in a retracted state;

[0039] Figure 11 is a three-dimensional schematic diagram of the middle tube assembly of the present invention in an extended state;

[0040] Figure 12 This is a diagram of the internal structure of the heat exchange component of the present invention;

[0041] Figure 13 A structural diagram of the carriage of the present invention;

[0042] Figure 14 It is a partial schematic diagram of the sliding joint of the present invention.

[0043] In the figure: external pipe fitting 1, delivery head 11, input channel 111, output channel 112, top sleeve 12, heat exchange component 2, filter tank body 3, cylinder 4, fin 41, chute 42, middle pipe assembly 5, sleeve 51, sliding section 511, spray hole 512, bell mouth 513, nozzle 52, winding pipe fitting 53, torsion spring 531, adapter 532, mesh sleeve 533, spacer 54, auxiliary net 541, sliding strip 542, slide 7, end ring 55, contact frame 56, counterweight 57, overflow pipe 58, water-passing interlayer 59, sealing assembly 6, swing plate 61, wedge 611, plug 62, middle hole 63, guide hole 631, bellows 64, rotating frame 65, spring frame 66, clamping part 661, sliding part 662. DETAILED DESCRIPTION

[0044] This embodiment is the first embodiment of the present invention, which provides a saline wastewater treatment device based on sulfur autotrophic denitrification. A multi-effect evaporation device, a secondary effluent collection box, and a sulfur autotrophic denitrification filter are connected in series via a pipeline. The multi-effect evaporation device uses a triple-effect evaporator to remove some salt from the saline wastewater through flash crystallization. The resulting low carbon-nitrogen ratio wastewater is collected in the secondary effluent collection box, which then introduces the wastewater into the sulfur autotrophic denitrification filter.

[0045] The sulfur autotrophic denitrification filter body includes filter media and a filter body 3. The filter body 3 has a built-in supporting component for supporting the filter media. Elemental sulfur is used as the filter media and is placed in the filter body 3. A bacterial community mainly composed of denitrifying Thiobacillus is added to the filter body 3 so that a sulfur autotrophic denitrifying bacteria biofilm is attached to the filter media.

[0046] Sulfur autotrophic denitrification reaction is a new type of autotrophic denitrification technology that uses reduced sulfur sources such as sodium sulfide, sodium thiosulfate, and elemental sulfur as electron donors to reduce NO3-N to N2 in an anoxic environment.

[0047] In this embodiment, elemental sulfur is used as the filter material. Elemental sulfur is a by-product of petroleum production. It is low in cost, easy to handle and transport, non-toxic and harmless, and can serve as both an energy source and a filter material in the nitrification reaction. For every 1 mg of NO3-N removed, 7.54 mg of sulfate is generated and 4.57 mg of alkalinity is consumed. Alkalinity is crucial to the denitrification process. Limestone is cheap and readily available and is usually used as a pH buffer and inorganic carbon source for the autotrophic growth of bacteria. Therefore, a certain proportion of limestone particles is added to the reaction system. During the reaction, the limestone continuously dissolves and acts as a buffer. However, the addition of excessive CaCO3 will lead to an increase in the hardness of the process effluent, thereby indirectly causing phosphorus precipitation, affecting the growth of microorganisms. Ca(HCO3)2 is a soluble and more widely used limestone substitute that can be used as a supplement to alkalinity and carbon source.

[0048] In a further embodiment, elemental sulfur, activated carbon and limestone were used as filter materials for the fixed-bed reactor, and nearly complete autotrophic denitrification was achieved under a loading condition of 0.72 g NO3-N / (L·d). An autotrophic denitrification system was constructed using small particles of elemental sulfur and NaHCO3 as substrates. Under optimal operating conditions, a stable denitrification capacity of 1.3 g / (L·d) was obtained. In the absence of an external carbon source, elemental sulfur and nitrate served as electron donors and electron acceptors, respectively. Under the action of microorganisms mainly composed of denitrifying Thiobacillus, NO3-N served as an electron acceptor, reducing NO3-N to N2 and reducing the NO3-N concentration in the water.

[0049] During the nitrification reaction, temperature is an important environmental factor for the sulfur autotrophic denitrification process, which has a significant impact on the growth of bacteria and the rate of denitrification. Low temperature will inhibit the denitrification performance of the denitrifying bacteria system, thereby reducing the denitrification rate.

[0050] According to literature and actual production, the optimal growth temperature of Thiobacillus denitrificans is 29.5℃, the optimal denitrification temperature is 32.8℃, and the nitrate removal rate is higher at a temperature of 30℃ to 35℃. The activity of Thiobacillus denitrificans is better in the range of 28℃ to 32℃.

[0051] It can be seen that the optimum temperature for sulfur autotrophic denitrification is around 30°C. Since the reaction between sulfur autotrophic denitrifying bacteria and elemental sulfur is relatively active at around 30°C, in order to avoid the influence of cold water and low temperature on the denitrification reaction, when the ambient temperature is low, the filter material can be heated by the support component to keep the filter material at a suitable reaction temperature. If the filter material cools down rapidly due to the introduction of low-temperature sewage, the stacking state of the filter material can be changed by the support component to increase the heating contact area, which can quickly restore the temperature inside the filter tank. Then, when the sulfur autotrophic denitrifying bacteria carry out the denitrification reaction, the contact area and reaction temperature between the filter material and the sewage are guaranteed, thereby improving the denitrification efficiency.

[0052] For bearing components, refer to Figure 2 and 3 The bearing assembly includes an external pipe 1, a middle pipe assembly 5, a partition structure and a cylinder 4. The cylinder 4 forms a water passage in the filter tank body 3. Wastewater flows from top to bottom through the filter material in the cylinder 4. Sulfur autotrophic denitrifying bacteria are attached to the filter material, which can perform biological denitrification in contact with the sewage.

[0053] Reference Figure 3 A stacked partition structure is set up on the circumferential side wall of the middle tube component 5, and the filter material is placed in layers in the cylinder 4. A plurality of groups of partition structures are fixed on the circumferential side wall of the middle tube component 5. The partition structures are filled with filter material, and the filter material is divided into multiple independent parts, so that the filter material is carried separately, eliminating the situation where the bottom layer of filter material is compressed and compacted due to the excessive thickness of the filter material stacking, making the gaps between the filter materials uniform, making it easier for sewage to enter the gaps between the filter materials, and the contact area between the sulfur element and the sewage is larger and the ionization is more active.

[0054] Because the filter material mainly composed of sulfur is not active in the process of ionization and generating electrons under low temperature, the middle pipe assembly 5 is coaxially arranged in the cylinder 4, and the external pipe 1 inputs the temperature control medium into the middle pipe assembly 5 to increase the temperature of the middle pipe assembly 5, so that the filter material is heated to an active state. Figure 2The bottom of the middle pipe component 5 is connected to the external pipe fitting 1, and the external pipe fitting 1 is connected in series with a heat exchange component 2. The waste heat or other heat sources generated by the early distillation treatment of the salt-containing wastewater can be used to provide continuous heat for the heat exchange component 2, thereby heating the temperature control medium entering the middle pipe component 5 through the external pipe fitting 1, so that the temperature of the middle pipe component 5 increases, thereby driving the filter material in the cylinder 4 to heat up, and by controlling the connection / disconnection of the waste heat or other heat sources with the heat exchange component 2, the internal temperature of the filter material can be maintained at a maximum temperature of about 30°C, so that the sulfur element filter material can be quickly heated in low-temperature sewage to provide the electrons required for denitrification, and the inactivation of sulfur autotrophic denitrifying bacteria caused by excessive temperature can be avoided.

[0055] At the same time, the continuous input of the temperature control medium increases the internal pressure of the middle tube assembly 5 and causes it to stretch. Figure 4 The middle tube assembly 5 includes a sleeve 51, the upper half of which is set as a sliding section 511. The sleeve 51 is slidably connected with the adjacent sliding section 511, so that the middle tube assembly 5 can be telescopically deformed in the vertical direction. After the medium in the external pipe 1 continues to enter the middle tube assembly 5, the internal pressure of the middle tube assembly 5 will increase and the middle tube assembly 5 will be extended from a contracted state to an extended state.

[0056] By changing the state of the middle tube assembly 5, the middle tube assembly 5 extends and drives the partition structures away from each other and deforms to change the state of the filter material accumulation to heat up faster. Figure 10 and 11 The separation structure includes a nozzle 52, a winding tube 53 and a partition 54. The nozzle 52 is arranged in a ring array in the middle section of the sleeve 51, and the winding tube 53 is arranged in a ring array at the lower edge of the sleeve 51. The partition 54 is connected between the nozzle 52 on the lower sleeve 51 and the winding tube 53 on the upper sleeve 51. When the middle pipe assembly 5 is in the retracted state, the partition 54 is in a horizontal ring state. The filter material is pressed into a horizontal ring by the upper and lower layers of the partition 54. When the internal pressure of the middle pipe assembly 5 increases and the middle pipe assembly 5 is extended The nozzle 52 and the winding tube 53 are separated from each other, the distance between the upper and lower layers of the partition mesh 54 is increased, the partition mesh 54 wrapped around the outside of the winding tube 53 is pulled and released, and the partition mesh 54 is transformed from a horizontal ring state to a corrugated ring state, changing the bottom shape of the filter material, providing a larger heat exchange contact area and a larger accommodation space between the filter material and the partition mesh 54, which will make the filter material loose, making it easier for heat to be transferred through the partition mesh 54 and the water in the cylinder 4, thereby heating the sulfur element as the filter material.

[0057] To ensure the sustainability of the temperature rise, the temperature control medium must be continuously filled to heat the middle tube assembly 5. Figure 4 and 5The external pipe fitting 1 includes a delivery head 11 and a top sleeve 12. The middle pipe assembly 5 is located between the delivery head 11 and the top sleeve 12. The delivery head 11 is provided with an input channel 111 that is connected to the middle pipe assembly 5. A pumping device is connected in series on the external pipe fitting 1, so that the temperature control medium flows through the heat exchange component 2 for heat exchange and temperature increase, and then enters the middle pipe assembly 5 through the input channel 111. The middle pipe assembly 5 is built with multiple overflow pipes 58 that are slidably connected end to end. The overflow pipe 58 at the bottom is connected to the output channel 112 of the delivery head 11. An overflow gap is left between the overflow pipe 58 at the top and the inner wall of the top sleeve 12. The temperature control medium flowing from bottom to top will flow out of the middle pipe assembly 5 from the top overflow pipe 58 after gradually cooling down, and flow back to the heat exchange component 2 through the output channel 112 and the external pipe fitting 1. The medium can circulate to provide continuous heat.

[0058] Furthermore, in order to ensure that the expansion and contraction changes of the middle pipe component 5 can stably drive the deformation of the partition structure, considering that solid impurities are contained in the sewage, and solids will be precipitated during the denitrification by sulfur autotrophic denitrifying bacteria, these solids will adhere to the surface of the partition 54. When the partition 54 is in the rolled-up state, the partition 54 will be adhered, resulting in an increase in the internal pressure of the middle pipe component 5 but it cannot be extended. Therefore, the blocking component 6 is not provided at the spray hole 512 at the top of the sliding section 511, and the sliding section 511 is connected to the sleeve 51 to form a water-passing interlayer 59. The winding pipe 53 is connected to the water-passing interlayer 59 through a hollow adapter 532. A mesh sleeve 533 is provided on the outside of the winding pipe 53. A slit is provided on the side wall of the mesh sleeve 533 along the axial direction for the partition 54 to enter and exit. The mesh sleeve 533 can cover the winding pipe 53 and the wound-up partition mesh 54 on its outside, reducing the solid impurities accumulated between the partition meshes 54 and reducing the occurrence of adhesion of the partition meshes 54. When the heat cannot be blocked and this situation occurs, when the middle tube component 5 is shortened, the temperature control medium will flow into the winding tube 53 through the spray hole 512 that is always connected, and be sprayed out from the openings on the circumferential side wall of the winding tube 53 to rinse, clean and separate the partition mesh 54, so that the middle tube component 5 can be smoothly extended and the partition mesh 54 can be smoothly pulled out of the mesh sleeve 533. The water-passing interlayer 59 is a dynamic space. When the middle tube component 5 is extended to the limit state, the lower edge of the sleeve 51 will block the spray hole 512 at the top of the sliding section 511. At this time, the water-passing interlayer 59 disappears, and the winding tube 53 no longer has temperature-control medium sprayed out, which can reduce the waste of temperature-control medium.

[0059] The heat of the middle tube assembly 5 is transferred to the cylinder 4 through the partition structure, further improving the heating efficiency. Figure 11 The inner wall of the cylinder 4 is embedded with fins 41, and the two ends of the fins 41 are bent toward the middle tube assembly 5 when relaxed. The middle tube assembly 5 heats the filter material from the middle, the partition structure heats the filter material from the bottom, the cylinder 4 heats the filter material from the outside, and the fins 41 extend into the filter material to transfer heat, thereby heating the filter material from multiple angles and directions.

[0060] In a further embodiment, the main by-products of the sulfur autotrophic denitrification process are sulfate and acidity. Sulfate can be converted into solid sulfide through biochemical reactions in the reactor. Filling with small particles of elemental sulfur may cause the reactor to be blocked due to reasons such as microbial growth, resulting in serious blockage and head loss in the reactor, and reducing the contact surface with sewage, thereby reducing the surface area available for hydrolysis and ionization of elemental sulfur, and also resulting in a slow electron supply rate. In order to eliminate the interference of compaction on the inactive electron release, backflushing is required to disperse the filter material.

[0061] In the first step, the backflushing medium continuously enters to stretch the middle tube assembly 5 and change the position state of the partition structure, thereby causing the filter material to be gathered to a position that is easy to flush. At this time, the filter material is driven to the bottom in a corrugated ring state, that is, a large amount of filter material is raised relative to the nozzle 52 on the same layer due to the winding tube 53. Under the limitation of the inclined partition net 54, it will be concentrated above the nozzle 52.

[0062] The middle tube assembly 5 is stretched to the limit state, and the internal pressure of the middle tube assembly 5 increases, so that the blocking assembly 6 opens the nozzle hole 512 and the recoil medium flows to the nozzle 52. Figure 10 The internal pressure of the middle pipe assembly 5 acts on the position of the plugging assembly 6. One side of the plug 62 is connected to a bellows 64 through a swing plate 61. The swing plate 61 is located between the bellows 64 and the plug 62 and is penetrated by a rotating rack 65. The rotating rack 65 is fixedly connected to the middle pipe assembly 5. The bellows 64 of the plugging assembly 6 is compressed, thereby making the plug 62 move away from the nozzle hole 512. The nozzle 52 is connected to the sleeve 51 via the nozzle hole 512, and the piled materials accumulated above the nozzle 52 can be vertically flushed from bottom to top.

[0063] At the same time, refer to Figure 8 , a wedge 611 is provided at one end of the swing plate 61 away from the plug 62, and a spring rack 66 corresponding to the wedge 611 is fixed to the inner wall of the middle tube assembly 5. A continuous clamping portion 661 is provided at the contact position between the spring rack 66 and the wedge 611. At this time, the wedge 611 and the clamping portion 661 overlap and squeeze the spring rack 66 to deform. Because the support force of the spring rack 66 on the wedge 611 is greater, the air in the bellows 64 can be fully compressed to shrink before the wedge 611 is separated from the clamping portion 661. The spring rack 66 is deformed, and the wedge block 611 is instantly separated from the clamping portion 661. When the swing plate 61 is released, the plug 62 quickly separates from the spray hole 512 to release the recoil medium. Since the spray hole 512 is arranged horizontally along the radial direction of the middle tube assembly 5, when the recoil medium is sprayed out, a high-speed jet is formed, which horizontally flushes from the center of the cylinder 4 along the radial direction of the cylinder 4 to the vertical inner wall of the cylinder 4, and contacts the piled material in the cylinder 4 horizontally, and uses the recoil medium to horizontally flush the piled material.

[0064] After the plug 62 quickly separates from the nozzle 512, it slowly returns to block the nozzle 512, so that the middle tube assembly 5 can fully expand and contract under the pressure of the counterweight 57. Figure 5 A counterweight 57 is provided on the top of the middle tube assembly 5. When the middle tube assembly 5 is sprayed and depressurized, the counterweight 57 compresses the middle tube assembly 5 downward. At this time, the wedge 611 contacts the sliding portion 662, and the spring frame 66 presses the sliding portion 662 against the top end surface of the wedge 611. When the bellows 64 expands and resets, the friction resistance between the wedge 611 and the sliding portion 662 delays the extension and reset of the bellows 64. In addition, a middle hole is opened in the middle of the plug 62. 63. A guide hole 631 is provided at one end of the middle hole 63 toward the nozzle 512. When the recoil medium in the middle tube assembly 5 flows toward the nozzle 512 at a high speed and impacts the plug 62 toward the nozzle 512, part of the recoil medium will flow toward the guide hole 631 through the middle hole 63, and then dispersed through the guide hole 631 toward the nozzle 512, reducing the cross-sectional area of ​​the plug 62, thereby reducing the thrust of the recoil medium on the plug 62, so that the plug 62 can be slowly reset.

[0065] The backwash medium continuously enters the middle tube assembly 5 and is ejected intermittently, causing the middle tube assembly 5 to reciprocate and expand. During the expansion and contraction process of the middle tube assembly 5, the state of the fin 41 is changed to impact the filter material. Figure 10 The fins 41 are embedded in the inner wall of the cylinder 4, and the circumferential side wall of the middle tube assembly 5 is fixedly connected with an end ring 55. The end ring 55 is provided with a contact frame 56 corresponding to the nozzle 52. The two ends of the fins 41 are bent toward the middle tube assembly 5 in the relaxed state. The contact frame 56 contacts the fins 41 before the end ring 55 during the expansion and contraction of the middle tube assembly 5. During the expansion of the middle tube assembly 5, the upper contact frame 56 squeezes the fins 41. After the end ring 55 passes through the fins 41, the fins 41 are relaxed, so that the fins 41 rebound and reset, impacting the filter material below the end ring 55. During the contraction of the middle tube assembly 5, the lower contact frame 56 squeezes the fins 41. After the end ring 55 passes through the fin 41, the fin 41 is relaxed, so that the fin 41 rebounds and resets, impacting the filter material above the end ring 55, and when the middle tube assembly 5 is released from compression for a short time, the torsion spring 531 resets and rebounds, and the partition net 54 is wrapped around the outside of the winding tube 53 again. The filter material accumulated above the nozzle 52 gradually tends to a horizontal position as the partition net 54 collapses to both sides of the nozzle 52. Because the middle part of the fin 41 is opposite to the position of the nozzle 52, the filter material collapses to the two ends of the fin 41. When the fin 41 rebounds, the speed of the two ends is relatively large, which can effectively impact the filter material falling to the two ends of the fin 41 and crush the compacted filter material.

[0066] In a further embodiment, a saline wastewater treatment device based on sulfur autotrophic denitrification is provided. When the screen 54 separates the filter material into multiple layers for separate stacking, the screen 54 deforms along with the nozzle 52 and the winding pipe 53. The filter material may fall from the gap between the screen 54 and the inner wall of the cylinder 4, resulting in excessive filter material in the lower layer and reduced filter material in the upper layer. To avoid this situation, the screen 54 is divided into two parts according to whether it is wound on the winding pipe 53. Figure 13 and 14, is always located on the outside of the winding tube 53, and is connected to the inner wall of the end ring 55 by fixing the elastic auxiliary net 541 at the end. Under the premise of not affecting the retraction and deformation of the partition net 54, the filter material is prevented from falling between the partition net 54 and the end ring 55. The retractable part of the partition net 54 is connected to a sliding strip 542 and has a section located on the outside of the winding tube 53. A plurality of slides 7 are horizontally slidably connected on the sliding strip 542. The slides 7 are vertically slidably connected to the slide groove 42 on the inner wall of the cylinder 4. 4 is located inside the winding tube 53, the slide 7 is accumulated on the part of the sliding strip 542 located outside the winding tube 53, and when the partition net 54 is pulled out of the winding tube 53, the slide 7 will slide up in the slide groove 42 and disperse onto the sliding strip 542, so that the rolled partition net 54 can be released and the sliding strip 542 can be ensured to be close to the inner wall of the cylinder 4, thereby preventing the filter material from falling between the newly released partition net 54 and the inner wall of the cylinder 4, and stably carrying the filter material in layers.

[0067] A method for using the device includes the following steps:

[0068] S1. The saline wastewater is introduced into a multi-effect evaporation device for heating and concentration, and some soluble salts in the saline wastewater are removed by crystallization to form secondary wastewater with a low carbon-nitrogen ratio;

[0069] S2. Low-salt wastewater is introduced into the filter body 3 for sulfur autotrophic denitrification. The waste heat generated in the triple-effect evaporator is introduced into the heat exchange component 2 through a pipeline, which serves as a heat source to provide heat to the medium in the external pipe 1. When the temperature rises above 30°C, the connection between the heat exchange component 2 and the heat source is disconnected by the temperature control device, thereby controlling the heat provided by the temperature control device to quickly heat the filter material to a temperature state of about 30°C, thereby ensuring that the sulfur autotrophic denitrifying bacteria are in a suitable reaction temperature environment.

[0070] S3. Under low temperature conditions, the medium enters the middle tube assembly 5, causing it to stretch, driving the annular partition structure to expand into a corrugated annular state, changing the stacking state of the filter material, providing a larger heat exchange contact area and a larger accommodation space for the filter material to loosen the filter material, facilitating heat transfer to heat the sulfur element as the filter material;

[0071] S4. At the same time, if the spacer nets 54 in the gathered state are stuck together due to deposits and cannot be unfolded, the temperature control medium in the middle tube assembly 5 will be sprayed from the winding tube 53 to the wound spacer nets 54, so that the spacer nets 54 are smoothly separated and unfolded in a corrugated ring state;

[0072] S5, the heat of the middle tube assembly 5 is transferred to the partition structure and the cylinder 4, and then to the relaxed state fins 41, further increasing the heat conduction contact surface between the fins and the filter material, achieving efficient heating;

[0073] S6. In normal wastewater treatment, elemental sulfur, as a filter material, easily combines with sediment in the wastewater and forms a compaction, resulting in slow electron release. By providing a recoil medium to the middle tube assembly 5 and ejecting the medium through the spray holes 512, a recoil action is generated from the middle tube assembly 5 toward the cylinder 4, thereby dispersing the elemental sulfur and the sediment.

[0074] In the recoil state, the recoil medium enters the middle tube assembly 5, causing its internal pressure to increase. The bellows 64 is compressed, and the wedge 611 overlaps the clamping portion 661 to squeeze the spring frame 66, causing the plug 62 to quickly separate from the nozzle hole 512, forming a high-pressure horizontal jet. At the same time, the nozzle 52 flushes the filter material accumulated at the nozzle 52 upward and downward. Afterward, the bellows 64 rebounds and cooperates with the sliding portion 662 of the spring frame 66, causing the plug 62 to slowly approach the nozzle hole 512, giving the middle tube assembly 5 sufficient time to be compressed by the counterweight 57.

[0075] S8, when the middle tube assembly 5 is released from compression, the torsion spring 531 returns to its original position and rebounds, wrapping the screen 54 around the outside of the winding tube 53 again. The accumulated filter material collapses toward the ends of the fin 41. The fin 41 is aligned with the nozzle 52. During the contraction of the middle tube assembly 5, the filter material that collapses from the nozzle 52 to the sides will fall toward the ends of the fin 41 with greater force.

[0076] S9, the spray hole 512 of the middle tube assembly 5 is closed, and as the middle tube assembly 5 rises again, the medium flushing and fin 41 impact will be repeated again until the effluent denitrification of the filter body 3 meets the requirements, and the backwash cleaning is completed;

[0077] S10, the effluent from the filter body 3 enters the sedimentation tank and the ozone sterilization tank for subsequent impurity removal and disinfection to meet the emission standards. An exhaust pipe is set on the top of the filter body 3 to release the nitrogen generated by the reaction in real time.

[0078] The triple-effect evaporator, sedimentation tank and ozone sterilization tank of these embodiments are existing products and will be obvious to professionals in this field. The general principles defined in this article can be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown in this article, but will conform to the widest scope consistent with the principles and novel features disclosed in this article.

Claims

1. A saline wastewater treatment device based on sulfur autotrophic denitrification, comprising filter material and a filter body (3), wherein the filter body (3) is equipped with a load-bearing component, characterized in that: The bearing assembly comprises an external pipe (1), a middle pipe assembly (5), a partition structure and a cylinder (4); the cylinder (4) forms a water passage in the filter tank body (3); the middle pipe assembly (5) is coaxially arranged in the cylinder (4); a plurality of groups of partition structures arranged vertically are fixed to the circumferential side wall of the middle pipe assembly (5); filter material is filled between the partition structures; the external pipe (1) inputs a temperature control medium into the middle pipe assembly (5) to increase the temperature of the middle pipe assembly (5); the continuous input of the temperature control medium causes the middle pipe assembly (5) to extend; the extension of the middle pipe assembly (5) drives the partition structures to move away from each other and deform, thereby changing the accumulation state of the filter material; The middle pipe assembly (5) includes a sleeve (51), and the separation structure includes a nozzle (52), a reeling pipe (53) and a partition (54). The nozzle (52) is arranged in a ring array at the middle section of the sleeve (51), and the reeling pipe (53) is arranged in a ring array at the lower edge of the sleeve (51). A partition (54) is connected between the nozzle (52) located on the lower sleeve (51) and the reeling pipe (53) located on the upper sleeve (51). 54), when the middle tube assembly (5) is in the contracted state, the spacer (54) is in a horizontal ring state, and the filter material is pressed into a horizontal ring by the upper and lower layers of the spacer (54). When the internal pressure of the middle tube assembly (5) increases and the middle tube assembly (5) stretches, the nozzle (52) and the winding tube (53) move away from each other, the distance between the upper and lower layers of the spacer (54) increases, and the spacer (54) wrapped around the outside of the winding tube (53) is pulled and released, and the spacer (54) is transformed from a horizontal ring state to a corrugated ring state.

2. The saline wastewater treatment equipment based on sulfur autotrophic denitrification according to claim 1, characterized in that: The upper half of the sleeve (51) is configured as a sliding section (511), the sleeve (51) and the adjacent sliding section (511) are sleeved and slidably connected, a counterweight (57) is provided on the top of the middle pipe assembly (5), and a heat exchange assembly (2) is connected in series to the external pipe (1).

3. The saline wastewater treatment equipment based on sulfur autotrophic denitrification according to claim 2, characterized in that: The external pipe fitting (1) comprises a delivery head (11) and a top sleeve (12); the middle pipe assembly (5) is located between the delivery head (11) and the top sleeve (12); and the delivery head (11) is provided with an input channel (111) communicating with the middle pipe assembly (5).

4. The saline wastewater treatment equipment based on sulfur autotrophic denitrification according to claim 3, characterized in that: The end of the winding tube (53) is rotatably connected to a transfer seat (532), the transfer seat (532) is fixedly connected to the sleeve (51), and a torsion spring (531) is connected between the winding tube (53) and the transfer seat (532).

5. The saline wastewater treatment equipment based on sulfur autotrophic denitrification according to claim 4, characterized in that: A spray hole (512) is provided on the side wall of the middle tube assembly (5), and a blocking assembly (6) is provided at the position of the spray hole (512). The spray hole (512) located at the top of the sliding section (511) is not provided with a blocking assembly (6). The sliding section (511) and the sleeve (51) are sleeved and connected to form a water-passing interlayer (59). The winding tube (53) is conductively connected to the water-passing interlayer (59) through a hollow adapter (532). A mesh sleeve (533) is sleeved on the outside of the winding tube (53), and a slit is provided on the side wall of the mesh sleeve (533) along the axial direction for the partition net (54) to enter and exit.

6. The saline wastewater treatment equipment based on sulfur autotrophic denitrification according to claim 5, characterized in that: The inner wall of the cylinder (4) is embedded with fins (41), and the state of the fins (41) is changed during the expansion and contraction of the middle tube assembly (5) to impact the filter material. The circumferential side wall of the middle tube assembly (5) is fixedly connected with an end ring (55), and a contact frame (56) is provided at the end ring (55) corresponding to the nozzle (52). When both ends of the fins (41) are relaxed, they bend toward the middle tube assembly (5), and the contact frame (56) contacts the fins (41) before the end ring (55) during the expansion and contraction of the middle tube assembly (5).

7. The saline wastewater treatment equipment based on sulfur autotrophic denitrification according to claim 6, characterized in that: The plugging assembly (6) comprises a plug (62), one side of the plug (62) is connected to a bellows (64) via a swing plate (61), a rotating frame (65) is installed through the swing plate (61) between the bellows (64) and the plug (62), and the rotating frame (65) is fixedly connected to the middle pipe assembly (5).

8. The saline wastewater treatment equipment based on sulfur autotrophic denitrification according to claim 7, characterized in that: A wedge block (611) is provided at one end of the swing plate (61) away from the plug (62); a spring holder (66) corresponding to the wedge block (611) is fixed to the inner wall of the middle tube assembly (5); a continuous clamping portion (661) and a sliding portion (662) are provided at the contact position between the spring holder (66) and the wedge block (611); a middle hole (63) is provided in the middle of the plug (62); and a guide hole (631) is provided at one end of the middle hole (63) facing the spray hole (512).

9. The method for treating saline wastewater using the saline wastewater treatment equipment based on sulfur autotrophic denitrification according to claim 8, characterized in that: The steps include: S1. The saline wastewater is introduced into a multi-effect evaporation device for heating and concentration, and some soluble salts in the saline wastewater are removed by crystallization to form secondary wastewater; S2, introducing low-salt wastewater into the filter body (3) for sulfur autotrophic denitrification, using pipelines to introduce waste heat generated in the multi-effect evaporator into the heat exchange component (2), which serves as a heat source to provide heat for the medium in the external pipe (1), and by setting a temperature control device, ensure that the sulfur autotrophic denitrifying bacteria are in a suitable reaction temperature environment; S3, under low temperature, the medium enters the middle tube assembly (5) to stretch it, driving the annular partition structure to expand into a corrugated annular state, changing the stacking state of the filter material, providing the filter material with a larger heat exchange contact area and a larger accommodation space to make the filter material loose, thereby facilitating heat transfer to heat the sulfur element as the filter material; S4, the spacer net (54) in the gathered state is unable to unfold due to the adhesion of the deposited attachments, and the temperature control medium in the middle tube assembly (5) is sprayed from the winding tube (53) to the wound spacer net (54), so that the spacer net (54) is smoothly separated and unfolded in a corrugated ring state; S5, the heat of the middle tube assembly (5) is transferred to the partition structure and the cylinder (4), and then to the relaxed fins (41), further increasing the heat conduction contact surface between the fins and the filter material, thereby achieving rapid temperature rise of the filter material; S6. In normal wastewater treatment, elemental sulfur acts as a filter material and is easily combined with sediment in the wastewater to form a compacted surface. By providing a backwash medium to the middle pipe assembly (5), the medium is ejected through the spray hole (512) to generate a backwash action from the middle pipe assembly (5) toward the cylinder (4), thereby dispersing the elemental sulfur and the sediment. S7, in the recoil state, the recoil medium enters the middle tube assembly (5) to increase its internal pressure, the bellows (64) is compressed, the wedge block (611) and the clamping portion (661) overlap and squeeze the spring frame (66) to deform, so that the plug (62) quickly separates from the nozzle (512) to form a high-pressure jet, and at the same time the nozzle (52) will flush the filter material concentrated at the nozzle (52) position up and down; then the bellows (64) rebounds and cooperates with the sliding portion (662) of the spring frame (66) to make the plug (62) slowly approach the nozzle (512), so that the middle tube assembly (5) has sufficient time to be compressed short by the counterweight (57); S8, when the middle tube assembly (5) is released from compression for a short time, the torsion spring (531) is reset and rebounded, and the spacer (54) is wound around the outside of the winding tube (53) again, and the accumulated filter material collapses toward the two ends of the fin (41). During the shortening process of the middle tube assembly (5), the two ends of the fin (41) can impact more accumulated filter material; S9, as the medium continues to enter the middle pipe assembly (5), the middle pipe assembly (5) reciprocates and expands, repeatedly flushing the filter media and impacting the fins (41) until the effluent from the filter tank body (3) meets the denitrification requirements, and the backwash cleaning is terminated; S10, the effluent from the filter body (3) enters the sedimentation tank and the ozone sterilization tank for subsequent impurity removal and disinfection to meet the discharge standard. An exhaust pipe is provided on the top of the filter body (3) to release the nitrogen generated by the reaction.

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