Multi-stage sewage purification device
By using alternating anoxic and aerobic zones arranged in multiple stages, combined with a fixed biofilm and an intermittent stirring device, the problems of excessive residence time and numerous power equipment in multi-stage AO processes are solved, achieving efficient purification and device integration.
Patent Information
- Application Number
- CN202520151361.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-01-22
AI Technical Summary
Existing multi-stage AO processes suffer from excessively long residence times and numerous power equipment, resulting in complex operation and high energy consumption.
The system employs alternating anoxic and aerobic zones, combined with a fixed biofilm and intermittent stirring device, to reduce the amount of power required and to facilitate the degradation of organic matter through the biofilm.
While maintaining the treatment effect of multi-stage AO process, the residence time and power equipment usage were reduced, the organic matter removal rate was improved, and the device was integrated and highly efficient in purification.
Smart Images
Figure CN223852404U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of sewage treatment, specifically relates to a multistage sewage purification device. BACKGROUND
[0002] In the field of sewage treatment, the multistage AO process is commonly used for the sewage, especially the sewage with better biodegradability, and has better purification effect. The multistage AO process is a modified activated sludge method, which makes the carbon source in the sewage selectively supplied to different functional areas by dividing the sewage into multiple sections and entering the anaerobic zone, anoxic zone, facultative zone and aerobic zone in the biological tank. The process is preferentially used for anaerobic phosphorus release and denitrification, which can effectively save carbon source. At the same time, it can also improve the sludge concentration and reduce the biological tank volume. The multistage AO series can cancel the internal reflux equipment, the nitrification liquid of the upper stage completely enters the anoxic zone of the lower stage for denitrification, strengthens the denitrification effect and improves the denitrification efficiency. In short, the multistage AO process has the advantages of more reasonable allocation of carbon source, small land occupation and high denitrification and phosphorus removal efficiency.
[0003] The multistage AO process makes the carbon source in the sewage more fully utilized by the way of segmented water inlet, but each AO section bears the removal of organic matter, ammonia nitrogen and total nitrogen (TN), so each section of AO needs a longer residence time to ensure the removal efficiency of organic matter and nitrogen. The data shows that the total residence time of the example using the multistage AO process is greater than 54 hours. In addition, due to the setting of the multistage AO section, each section of AO needs stirring equipment for stirring, and there are more power equipment, the control is more complex, and the maintenance is frequent. The longer residence time and more power equipment have become the disadvantages of the multistage AO process.
[0004] Therefore, it is necessary to further improve the multistage AO process in view of the disadvantages of longer residence time and more power equipment, to maintain the treatment effect of the multistage AO process, and at the same time to achieve the purpose of reducing the residence time and the use amount of power equipment. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a multistage sewage purification device to solve the technical problems of longer residence time and more power equipment of the multistage AO process commonly used in the prior art, so as to maintain the treatment effect of the multistage AO process, and at the same time to achieve the purpose of reducing the residence time and the use amount of power equipment.
[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme:
[0007] A multi-stage sewage purification device for purifying sewage, comprising a first pool body, a plurality of second pool bodies, a plurality of third pool bodies, and a fourth pool body, each second pool body and each third pool body are arranged in an alternating sequence, the first pool body is connected to the first branch pipe, and the first branch pipe is connected to the first pool body to provide water for the first pool body; each second branch pipe is connected to each third pool body to simultaneously provide water for each third pool body;
[0008] The water inlet pipe also includes a first branch pipe and a plurality of second branch pipes that are the same number as the third pool bodies, the first branch pipe is connected to the first pool body to provide water for the first pool body; each second branch pipe is connected to each third pool body to simultaneously provide water for each third pool body;
[0009] Each second pool body and / or each third pool body is provided with a fixed filler, and the surface of the fixed filler is attached with a biofilm layer.
[0010] As a preferred embodiment, the fourth pool body is provided with a fifth pool body, and the outlet water of the fourth pool body enters the fifth pool body; the fifth pool body comprises a coagulation pool body, a flocculation pool body, and a separation pool body arranged in the water flow direction; the coagulation pool body and the flocculation pool body are respectively provided with a first pneumatic stirring device and a second pneumatic stirring device; the separation pool body is provided with a gas lift reflux device, and the reflux end of the gas lift reflux device is located in the coagulation pool body to reflux the sludge in the separation pool body to the coagulation pool body.
[0011] As a preferred embodiment, the first pool body is provided with a first intermittent stirring device, the first intermittent stirring device is arranged on one side of the first pool body, and the first intermittent stirring device is connected to the gas output end of an intermittently operated fan to form a circulating flow in the pool body, complete water movement with less aeration amount, and prevent sludge deposition.
[0012] As a preferred embodiment, the third pool body is provided with a second intermittent stirring device, the second intermittent stirring device is arranged on one side of the third pool body, and the second intermittent stirring device is connected to the gas output end of an intermittently operated fan to form a circulating flow in the pool body, complete water movement with less aeration amount, and prevent sludge deposition.
[0013] As a preferred embodiment, the second pool body is provided with a first aeration device, which is connected to the gas output end of a continuously operated fan to provide oxygen for the second pool body.
[0014] As a preferred embodiment, the fourth pool body is provided with a second aeration device, which is connected to the gas output end of a continuously operated fan to provide oxygen for the fourth pool body.
[0015] As preferred, the multi-stage sewage purification device further comprises a plug flow circulating pool body, the fourth pool body is communicated with the bottom of the plug flow circulating pool body, a baffle is fixed between the plug flow circulating pool body and the first pool body, the baffle extends vertically upward from the bottom between the plug flow circulating pool body and the first pool body, and the top of the baffle has an inclined extension part towards the plug flow circulating pool body; and the bottom of the plug flow circulating pool body is provided with an aeration riser.
[0016] As preferred, the multi-stage sewage purification device further comprises a sixth pool body, the effluent of the fifth pool body enters the sixth pool body, the sixth pool body is provided with an effluent pipe for leading out the purified water body, and the sixth pool body is provided with light filler.
[0017] As preferred, the multi-stage sewage purification device further comprises a clean water pool and a equipment room, the clean water pool is used for receiving the effluent of the sixth pool body, and the equipment room is used for installing various electric equipment; the integration of the clean water pool and the equipment room in the multi-stage sewage purification device can improve the integration degree of the device.
[0018] As preferred, the fixed filler is a hanging filler, and the hanging filler is in a silk shape.
[0019] The multi-stage sewage purification device has the following beneficial effects: the main process of the multi-stage sewage purification device is to adopt anoxic sections and aerobic sections arranged alternately in multiple stages, and to combine fixed biological membranes, so that the problems of long residence time and many power equipment in the conventional multi-stage AO process in the prior art are solved, so that the treatment effect of the multi-stage AO process is maintained, the residence time is reduced, and the use amount of power equipment is reduced. Through the multi-stage AO and biological attachment, continuous biological hydrolysis reduction reaction and biological oxidation reaction are carried out on the refractory organic matter, so that the removal rate of the refractory organic matter is increased. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the drawings, in which:
[0021] Figure 1 It is a plane arrangement structure schematic view of the multi-stage sewage purification device of the utility model embodiment.
[0022] Figure 2 It is a position arrangement schematic view of the first intermittent stirring device of the utility model embodiment.
[0023] Figure 3 It is a position arrangement schematic view of the second intermittent stirring device of the utility model embodiment.
[0024] Figure 4A fourth pool body and a first pool body water passing structure schematic view of the embodiment of the utility model.
[0025] Figure 5 A fifth pool body and a sixth pool body cross section structure schematic view of the embodiment of the utility model.
[0026] Mark explanation: 100, first pool body;101, water inlet pipe;102, first branch pipe;103, second branch pipe;104, first intermittent stirring device;105, first filler;106, baffle;107, inclined extension;200, second pool body;201, first aeration device;300, third pool body;301, fixed filler;302, second intermittent stirring device;400, fourth pool body;402, second aeration device;403, partition;500, fifth pool body;501, coagulation pool body;502, flocculation pool body;503, separation pool body;504, gas lift backflow device;505, inclined plate;506, water outlet overflow weir;507, first pneumatic stirring device;508, second pneumatic stirring device;600, sixth pool body;601, light filler;602, water outlet pipe;603, flow guide pipe;604, third pneumatic stirring device;605, gas lift sludge discharge device;700, clean water pool body;800, equipment room;900, plug flow circulating pool body;901, aeration lift. DETAILED DESCRIPTION
[0027] In order to better understand the purpose, structure and function of the utility model, the utility model a multi-stage sewage purification device is described in further detail below in combination with the drawings.
[0028] The utility model can be applied to the field of sewage purification, and is directed to sewage with good biodegradability, such as domestic sewage, pretreated industrial sewage and the like. The technical problems of long residence time and more power equipment of the conventional multi-stage AO process in the prior art are solved, so that the purpose of reducing residence time and reducing the use amount of power equipment is achieved while maintaining the treatment effect of the multi-stage AO process.
[0029] Embodiment 1, please refer to Figure 1 The embodiment provides a multi-stage sewage purification device, which comprises a first pool body 100 and a plurality of second pool bodies 200 and a plurality of third pool bodies 300, each second pool body 200 and each third pool body 300 are arranged in an alternating sequence, the first position of the alternating sequence is the second pool body 200, and the last position is the third pool body 300;
[0030] Further comprising a fourth pool body 400, a first water outlet pipe 401 is arranged on the fourth pool body 400, and the water outlet of the fourth pool body 400 is introduced into subsequent treatment facilities;
[0031] The water outlet of the first pool body 100 enters the first second pool body 200, and the water outlet of the last third pool body 300 enters the fourth pool body 400;
[0032] The water inlet pipe 101 is also included, which has a first branch pipe 102 and a plurality of second branch pipes 103, the number of which is the same as that of the third pool bodies 300. The first branch pipe 102 is connected to the first pool body 100 to provide water for the first pool body 100. Each second branch pipe 103 is connected to each third pool body 300 to simultaneously provide water for each third pool body 300. Specifically, in Example 1, the first pool body 100 is an anaerobic denitrification pool, which requires anoxic conditions, with dissolved oxygen (DO) controlled below 0.5 mg / L and C / N ratio between 3:1 and 5:1. The first pool body 100 is provided with a first filler 105, which is a fixed filler or a movable filler, and the surface of the first filler is attached with a biofilm layer. Specifically, in Example 1, the second pool body 200 is a nitrosation and carbon removal pool. The nitrosation stage requires aerobic conditions, with DO controlled above 2.0 mg / L and C / N ratio between 4:1 and 6:1. The nitrosation and carbon removal pool mainly performs the nitrosation process (oxidizing ammonia nitrogen to nitrite) to remove carbon source (organic matter) and nitrogen source (ammonia nitrogen) in wastewater at the same time. The nitrosation and carbon removal pool can more effectively utilize carbon source, allowing the reaction process to be carried out at a lower carbon-nitrogen ratio. Specifically, in Example 1, the third pool body 300 is a hydrolysis and short-range denitrification pool, in which the oxygen content of the water body is uneven, and there are multiple reaction processes, mainly hydrolysis and short-range denitrification processes, which effectively decompose complex organic matter and convert it into simpler compounds to provide better conditions for subsequent biological treatment, while directly reducing nitrite (NO2—) to nitrogen (N2). The C / N ratio of the water body in the third pool body 300 needs to be between 3:1 and 5:1. Specifically, in Example 1, the fourth pool body 400 is used for end-stage nitrosation and carbon removal to further remove nitrogen and organic matter, with DO above 2.0 mg / L and C / N ratio between 4:1 and 6:1.
[0033] In the embodiment 1, the fixed filler is arranged in each of the second pool body 200 and / or each of the third pool body 300, and a biofilm layer 301 is attached to the surface of the fixed filler. The fixed filler 301 can be a biofilm-attached bed of anoxic or aerobic microorganisms, and can improve the purification effect. In the embodiment 2, the fixed filler 301 is a hanging filler, and the hanging filler is preferably in a filamentous shape. Of course, the hanging filler can also be in other similar shapes such as a spherical shape or a rope shape, and can also play a role in purification. The fixed filler 301 can use microorganisms fixed on a carrier to degrade organic matter in sewage. In this process, the microorganisms are attached to the fixed filler 301 or the carrier to form a biofilm. When the sewage flows, the pollutants are adsorbed and decomposed by the microorganisms in the biofilm. The fixed filler 301 has a strong impact load capacity, stable operation, and is suitable for treating high-concentration organic wastewater.
[0034] In the embodiment 2, on the basis of the embodiment 1, please refer to Figure 1 The fifth pool body 500 is further provided, and the effluent of the fourth pool body 400 enters the fifth pool body 500. The fifth pool body 500 includes a coagulation pool body 501, a flocculation pool body 502, and a separation pool body 503 arranged in the water flow direction. The first pneumatic stirring device 507 and the second pneumatic stirring device 508 are arranged in the coagulation pool body 501 and the flocculation pool body 502, respectively. The fifth pool body 500 is used for precipitating sludge in the effluent of the fourth pool body 400, so as to cancel the secondary sedimentation tank, reduce the land area required for sludge and water separation, and enhance the precipitation and phosphorus removal effect. The coagulation pool body 501 is used for adding a coagulant, the flocculation pool body 502 is used for adding a flocculant, and the first pneumatic stirring device 507 and the second pneumatic stirring device 508 are used for stirring the mixture of the coagulant and the flocculant with water, respectively. The separation pool body 503 is used for precipitating and separating the flocculation liquid in the flocculation pool body 502. In the embodiment 2, the separation pool body is provided with an inclined plate 505, the inclined plate 505 is used for reducing the water flow rate and increasing the attachment area of the sludge, so as to help the sludge to precipitate. The separation pool body is further provided with an effluent overflow weir 506 at a position close to the top, which is used for flowing out the clean water on the surface, so as to efficiently complete the sludge and water separation process. The bottom of the effluent overflow weir 506 has a slope inclined toward the sixth pool body, and the water in the effluent overflow weir 506 can flow toward the sixth pool body. The effluent end of the effluent overflow weir 506 is connected with a flow guide pipe 603, and the flow guide pipe 603 extends into the light filler in the sixth pool body from below the top end of the sixth pool body.
[0035] Example 3, on the basis of example 2, the first pool body 100 is provided with a first intermittent stirring device 104, the first intermittent stirring device 104 is arranged on one side of the first pool body 100. In example 3, the first intermittent stirring device 104 is used to connect to the gas output end of the intermittent working fan. For the purpose of forming a circulating flow inside the pool body, completing the water movement with less aeration amount, and preventing sludge deposition.
[0036] Example 4, on the basis of example 3, the third pool body 300 is provided with a second intermittent stirring device 302, the second intermittent stirring device 302 is arranged on one side of the third pool body 300, and the second intermittent stirring device 302 is used to connect to the gas output end of the intermittent working fan. For the purpose of forming a circulating flow inside the pool body, completing the water movement with less aeration amount, and preventing sludge deposition.
[0037] Example 5, on the basis of example 4, the second pool body 200 is provided with a first aeration device 201, the first aeration device 201 is used to connect to the gas output end of the continuous working fan, to provide oxygen for the second pool body, and further to provide dissolved oxygen required in the process of microbial aerobic degradation of pollutants for the system.
[0038] Example 6, on the basis of example 5, the fourth pool body 400 is provided with a second aeration device 402, the second aeration device 402 is used to connect to the gas output end of the continuous working fan, to provide oxygen for the fourth pool body.
[0039] Example 7, on the basis of example 6, further comprising a sixth pool body 600, the effluent of the fifth pool body 500 enters the sixth pool body 600, the sixth pool body 600 is provided with an effluent pipe 602 for leading out the purified water body; the sixth pool body 600 is provided with light filler 601. On the basis of the fifth pool body, the sixth pool body is added for further denitrification reaction, to achieve the purpose of deep purification of sewage water quality, the sixth pool body 600 is in anoxic condition, DO is usually below 0.5 mg / L, and C / N ratio is between 3:1 to 5:1.
[0040] Example 8, on the basis of any one of the above examples, further comprising a clean water pool and an equipment room, the clean water pool is used to receive the effluent of the sixth pool body 600, and the equipment room is used to install various electrical equipment; integrating the clean water pool and the equipment room in the multi-stage sewage purification device can improve the integration degree of the device.
[0041] Example 9, preferred embodiments of the above examples, to elaborate the technical solutions in the application in detail, please refer to Figures 1 to 5The multi-stage sewage purification device provided by the embodiment comprises a first pool body 100, three second pool bodies 200 and three third pool bodies 300 arranged in sequence along the water flow direction, and each second pool body 200 and each third pool body 300 are arranged in an alternating sequence, wherein the first one of the alternating sequence is the second pool body 200 and the last one is the third pool body 300.
[0042] The first intermittent stirring device 104 is arranged in the first pool body 100, the first intermittent stirring device 104 is arranged on one side of the first pool body 100, the first intermittent stirring device 104 is connected to the gas output end of the first fan, and the first fan works intermittently.
[0043] The first aeration device 201 is arranged in the second pool body 200, the first aeration device 201 is connected to the gas output end of the third fan, and the third fan works continuously; the second intermittent stirring device 302 is arranged in the third pool body 300, the second intermittent stirring device 302 is arranged on one side of the third pool body 300, the second intermittent stirring device 302 is connected to the gas output end of the second fan, and the second fan works intermittently; the purpose of forming a circulating flow in the pool body to complete water movement with less aeration amount and prevent sludge deposition. The fixed filler is arranged in each second pool body 200 and / or each third pool body 300, respectively, and a biofilm layer 301 is attached to the surface of the fixed filler, wherein the fixed filler 301 in the embodiment is a suspended filament filler made of plastic or cotton or hemp.
[0044] The multi-stage sewage purification device in Embodiment 9 further comprises a fourth pool body 400, the fourth pool body 400 is provided with a first water outlet pipe 401 for introducing the water outlet of the fourth pool body 400 into a subsequent treatment facility; the water outlet of the first pool body 100 enters the first second pool body 200, and the water outlet of the last third pool body 300 enters the fourth pool body 400; the second aeration device 402 is arranged in the fourth pool body 400, the second aeration device 402 is connected to the gas output end of the fourth fan, and the fourth fan works continuously. The purpose is to provide dissolved oxygen required in the process of aerobic degradation of pollutants by microorganisms.
[0045] The multi-stage sewage purification device in embodiment 9 further comprises a fifth pool body 500, and the effluent of the fourth pool body 400 enters the fifth pool body 500; the fifth pool body 500 comprises a coagulation pool body 501, a flocculation pool body 502 and a separation pool body 503 arranged in the water flow direction; the coagulation pool and the flocculation pool body 502 are respectively provided with a first pneumatic stirring device 507 and a second pneumatic stirring device 508. The fifth pool body 500 is used for precipitating sludge in the effluent of the fourth pool body 400, so as to cancel the secondary sedimentation tank, reduce the land area required for sludge-water separation, and enhance the sedimentation and phosphorus removal effect. In embodiment 9, the separation pool body is provided with an inclined plate 505, the inclined plate 505 is used for reducing the water flow rate, increasing the attachment area of the sludge, and helping the sludge to precipitate, and the separation pool body is further provided with an effluent overflow weir 506 at a position close to the top, which is used for flowing out the clean water on the surface, so as to efficiently complete the sludge-water separation process; the bottom of the effluent overflow weir 506 has a slope inclined towards the sixth pool body, and the water in the effluent overflow weir 506 can flow towards the sixth pool body; the effluent end of the effluent overflow weir 506 is communicated with a flow guide pipe 603, and the flow guide pipe 603 extends into the light filler below the sixth pool body from the top end of the sixth pool body.
[0046] The multi-stage sewage purification device in embodiment 9 further comprises a water inlet pipe 101, the water inlet pipe 101 has a first branch pipe 102 and a plurality of second branch pipes 103 which are the same in number as the third pool bodies 300, the first branch pipe 102 is communicated with the first pool body 100 and is used for providing water for the first pool body 100; each second branch pipe 103 is communicated with each third pool body 300 and is used for simultaneously providing water for each third pool body 300.
[0047] The multi-stage sewage purification device in embodiment 9 further comprises a sixth pool body 600, the effluent of the fifth pool body 500 enters the sixth pool body 600, and the sixth pool body 600 is provided with an effluent pipe 602 for leading out the purified water; the sixth pool body 600 is provided with light filler 601.
[0048] In addition, the multi-stage sewage purification device in embodiment 9 further comprises a clean water pool and a equipment room, the clean water pool is used for receiving the effluent of the sixth pool body 600, and the equipment room is used for installing various electrical equipment; the integration of the clean water pool and the equipment room in the multi-stage sewage purification device can improve the integration degree of the device.
[0049] The first pool body 100 is used for anaerobic denitrification, the second pool body is used for nitrosation and carbon removal reaction, the third pool body is used for hydrolysis and short-cut denitrification reaction, the fourth pool body is used for nitrification and carbon removal reaction, the fifth pool body is a high-density sedimentation tank used for precipitating flocculants in sewage, and the sixth pool body is a denitrification filter tank used for further denitrification.
[0050] The process flow of the multi-stage sewage purification device of Example 9 is as follows:
[0051] Anaerobic microorganisms are inoculated in the first pool body, anoxic microorganisms are inocated in the first third pool body, the second third pool body and the third third pool body respectively, and aerobic microorganisms are inoculated in the first second pool body, the second second pool body, the third second pool body and the fourth pool body respectively. The sewage to be treated can enter the first pool body, the first third pool body, the second third pool body and the third third pool body through the water inlet pipe 101, wherein the first pool body is provided with a first intermittent stirring device 104, and the first third pool body, the second third pool body and the third third pool body are all provided with a second intermittent stirring device 302. The first intermittent stirring device 104 and the second intermittent stirring device 302 are arranged with an aerator system in half or a local pool body area, so that the mixed liquid in the aerated pool body area moves in an upward flow mode, and the non-aerated pool body area moves in a downward flow mode, and an upward and downward circular flow motion is formed between the two, so that water movement is completed with less aeration amount, and the purpose of preventing sludge sedimentation is achieved. After the water inlet of the above four pool bodies and the circulating backflow water are mixed by the first intermittent stirring device 104 and the second intermittent stirring device 302, they flow through the biological attached bed and fully contact with the microorganisms on the attached bed, achieving the hydrolysis of organic matter and the short-term denitrification / complete denitrification process.
[0052] The first second pool body, the second second pool body and the third second pool body are all aerobic aeration pool bodies provided with a first aeration device 201, and the fourth pool body is also an aerobic aeration pool body provided with a second aeration device 402. The water quantity of the above four pool bodies can be adjusted in flow rate respectively according to the water quality of the inlet and outlet, so as to meet the requirements of water quality discharge standard of the outlet water under different inlet water quality, and has high flexibility and application range. Under normal circumstances, the water inlet quantity control is 40%, 30%, 20% and 10% in turn, and the oxidation-reduction potential of each pool body presents a step-by-step increase under the premise of ensuring denitrification, so as to meet the treatment effect of the system on total nitrogen and refractory organic matter.
[0053] The treated nitration liquid in the fourth tank body passes through the aeration riser 901 arranged in the push-flow circulating tank body 900 to complete the push-flow circulation process of the nitration liquid. The circulation amount of the nitration liquid is controlled by adjusting the opening degree of the valve on the aeration riser 901, and the opening degree range is determined by the online ORP range value arranged in the anoxic tank body. The fourth tank body is connected to the bottom of the push-flow circulating tank body 900, a baffle is fixed between the push-flow circulating tank body 900 and the first tank body, the baffle extends vertically upward from the bottom between the push-flow circulating tank body 900 and the first tank body, and the top of the baffle has an inclined extension part towards the push-flow circulating tank body 900; and the bottom of the push-flow circulating tank body 900 is provided with the aeration riser 901. Specifically, the fourth tank body and the push-flow circulating tank body 900 are provided with a partition plate, the bottom of the partition plate is provided with a water passage to realize the connection between the fourth tank body and the bottom of the first tank body. The separation tank body is provided with a gas stripping reflux device 504 for refluxing the sludge in the separation tank body to the coagulation tank body.
[0054] The mixed liquid treated in the first tank body to the fourth tank body in turn flows into the fifth tank body, the sludge separated in the separation tank body is refluxed to the coagulation tank body through the gas stripping reflux device 504, and the effluent from the fourth tank body is mixed with the coagulant added in the coagulation tank body, and the coagulation reaction process is completed through the air stirring system. In specific implementation, a sludge concentration meter is installed in the coagulation tank body to monitor the sludge content after mixing, so as to realize the automatic discharge process of the residual sludge.
[0055] In the coagulation tank body, the mixed liquid after coagulation flows into the flocculation tank body to complete the flocculation process. The mixed liquid after flocculation flows into the separation tank body after uniform water distribution, the separation tank body is provided with an inclined plate 505, the inclined plate 505 is used to reduce the water flow rate and increase the attachment area of the sludge to help the sludge sedimentation, and the separation tank body is also provided with a water overflow weir 506 near the top position to flow out the surface water, so as to efficiently complete the sludge-water separation process; the water overflow weir 506 has a slope towards the sixth tank body at the bottom, and the water in the water overflow weir 506 can flow towards the sixth tank body; the water outlet end of the water overflow weir 506 is connected with a flow guide pipe 603, and the flow guide pipe 603 extends into the light filler in the sixth tank body below the top end of the sixth tank body. After the sludge-water separation in the fifth tank body, the supernatant flows into the bottom of the sixth tank body, and the microorganisms attached to the light filler in the sixth tank body further complete the biological adsorption removal process of the residual suspended solids. When the total nitrogen of the effluent exceeds the standard, the carbon source is added in the sixth tank body to complete the denitrification process of the microorganisms in the light filler.
[0056] The sixth pool body is internally provided with a third pneumatic stirring device and a gas-lifting sludge discharge device, according to the effluent water quality, the suspended solids and microorganisms attached to the light filler are blown off through regular aeration stirring, and the mixed liquid is returned to the first pool body through the gas-lifting sludge discharge device, so that the purpose of the denitrification filter tank without a clean water backwashing tank is achieved. To ensure the backwashing process, no sludge water mixture flows out of the system, and a normally open electric valve is arranged on the effluent pipe. When backwashing is performed, the water inlet is stopped, the effluent electric valve is closed, and the automatic control process of the entire backwashing is realized through the PLC.
[0057] The multi-stage sewage purification device has the following technical effects:
[0058] 1. The main process of the multi-stage sewage purification device is to adopt multi-stage alternately arranged anoxic sections and aerobic sections, and combine fixed biological membranes, so that the problems of long residence time and many power equipment in the conventional multi-stage AO process in the prior art are solved, so that the residence time is reduced and the use amount of power equipment is reduced while maintaining the treatment effect of the multi-stage AO process. Through the multi-stage AO and biological attachment, the biologically hydrolytic reduction reaction and biological oxidation reaction of the refractory organic matter are continuously carried out, so that the removal rate of the refractory organic matter is increased.
[0059] 2. The multi-stage sewage purification device provided in the embodiment adopts fixed biological membranes, and combines the high-density sedimentation of the sludge in the fifth pool body, so that the secondary sedimentation tank is cancelled, the land area required for sludge-water separation is reduced, the sedimentation and phosphorus removal effects are enhanced, and the miniaturization and integration of the entire device are facilitated.
[0060] 3. The multi-stage sewage purification device adopts multi-stage water inlet, gas-lifting type micro-pressure-difference super-proportional single-stage circulating backflow, so that complete nitrification and denitrification or short-path nitrification and denitrification mainly occur in each anoxic pool of the system; the aerobic and anoxic microenvironments formed inside and outside the biological membrane occur in the aerobic pool, so that simultaneous nitrification and denitrification reaction occurs, efficient and deep denitrification is realized, the COD of the influent water is fully utilized as the carbon source required for denitrification, and the amount of carbon source added is reduced.
[0061] 4. All the anoxic pools adopt the mode of intermittent circulation stirring to complete the mixing and stirring process of the anoxic pool, so that the setting of pure stirring devices is saved, and the conditions of anoxic load in the anoxic pool are facilitated, and a certain degree of dissolved oxygen is maintained.
[0062] 5. The multi-stage sewage purification device adopts the gas-lifting type micro-pressure-difference plug flow circulation mode between the reaction pool bodies, so that the process of circulating backflow of the nitrification liquid is completed, and the purposes of reducing pipeline laying, power equipment and power equipment energy consumption are achieved.
[0063] 6. In practical applications, the multi-stage wastewater purification device provided in this embodiment can be conveniently equipped with instruments such as ammonia nitrogen, dissolved oxygen, ORP, and MLSS to improve its automation level. In this way, the entire set of equipment can be intelligently and automatically controlled by PLC, making the modification convenient.
[0064] 7. The multi-stage wastewater purification device provided in this embodiment adds a lightweight denitrification filter to the fifth tank with high-density sedimentation effect to achieve the purpose of deep purification of wastewater quality.
[0065] 8. The multi-stage wastewater purification device provided in this embodiment has a wide range of applications. In addition to conventional municipal wastewater, it is also suitable for the subsequent biological treatment stage of high ammonia nitrogen wastewater and recalcitrant organic wastewater.
[0066] It is understood that this utility model is described through some specific embodiments / exemplifications. Those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and specific embodiments / exemplifications without departing from the spirit and scope of this utility model. Under the teachings of this utility model, modifications can be made to these features and specific embodiments / exemplifications to adapt to specific situations and materials without departing from the spirit and scope of this utility model. The specific embodiments / exemplifications described in this utility model are only a part of the specific embodiments / exemplifications of this utility model, not all of them. The components of the specific embodiments / exemplifications of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the specific embodiments / exemplifications of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected specific embodiments / exemplifications of this utility model. Therefore, this utility model is not limited to the specific embodiments / exemplifications disclosed herein. All other specific embodiments / exemplifications obtained by those skilled in the art based on the specific embodiments / exemplifications of this utility model without inventive effort are within the scope of protection of this utility model.
Claims
1. A multi-stage sewage purification device for purifying sewage, characterized by comprising: The first pool body, a plurality of second pool bodies, a plurality of third pool bodies and a fourth pool body, each second pool body and each third pool body are arranged in an alternating sequence, the first position of the alternating sequence is the second pool body, the effluent of the first pool body enters the first position of the second pool body, the last position is the third pool body, and the effluent of the last position of the third pool body enters the fourth pool body; It also includes a water inlet pipe, the water inlet pipe has a first branch pipe and a plurality of second branch pipes which are the same as the number of the third pool bodies, the first branch pipe is connected with the first pool body for providing water for the first pool body; each second branch pipe is connected with each third pool body respectively for simultaneously providing water for each third pool body; Each second pool body and / or each third pool body is provided with fixed filler respectively, and a biofilm layer is attached to the surface of the fixed filler.
2. The multi-stage sewage purification device according to claim 1, characterized in that, It also includes a fifth pool body, the effluent of the fourth pool body enters the fifth pool body, the fifth pool body includes a coagulation pool body, a flocculation pool body and a separation pool body arranged in the water flow direction, the coagulation pool body and the flocculation pool body are respectively provided with a first pneumatic stirring device and a second pneumatic stirring device; The separation pool body is provided with a gas lift reflux device, the reflux end of the gas lift reflux device is located in the coagulation pool body for refluxing sludge in the separation pool body to the coagulation pool body.
3. The multi-stage sewage purification device according to claim 1, characterized in that, The first pool body is provided with a first intermittent stirring device, the first intermittent stirring device is arranged on one side of the first pool body, and the first intermittent stirring device is connected to the gas output end of the intermittently operated fan.
4. The multi-stage sewage purification device according to claim 1, characterized in that, The third pool body is provided with a second intermittent stirring device, the second intermittent stirring device is arranged on one side of the third pool body, and the second intermittent stirring device is connected to the gas output end of the intermittently operated fan.
5. The multi-stage sewage purification device according to claim 1, characterized in that, The second pool body is provided with a first aeration device connected to the gas output end of the continuously operated fan.
6. The multi-stage sewage purification device according to claim 1, characterized in that, The fourth pool body is provided with a second aeration device connected to the gas output end of the continuously operated fan.
7. The multi-stage sewage purification device according to any one of claims 1 to 6, characterized in that, It also includes a plug flow circulating pool body, the fourth pool body is connected with the bottom of the plug flow circulating pool body, a baffle is fixed between the plug flow circulating pool body and the first pool body, the baffle extends vertically upward from the bottom between the plug flow circulating pool body and the first pool body, the top of the baffle has an inclined extension part towards the plug flow circulating pool body, and the plug flow circulating pool body is provided with an aeration lift.
8. The multi-stage sewage purification device according to claim 2, characterized in that, It also includes a sixth pool body, the effluent of the fifth pool body enters the sixth pool body, the sixth pool body is provided with a water outlet pipe for leading out the purified water, and the sixth pool body is provided with light filler.
9. The multi-stage sewage purification device according to claim 8, wherein The multi-stage sewage purification device further includes a clean water pool and a equipment room, the clean water pool is used for receiving the effluent of the sixth pool body, and the equipment room is used for installing various electrical equipment.
10. The multi-stage sewage purification device according to claim 2, characterized in that, The fixed filler is a hanging filler, and the hanging filler is a wire-shaped filler.