Sewage treatment device

Abstract

The utility model discloses a sewage treatment device which comprises a treatment tank, a plurality of aerators, a plurality of three-phase separators, a first stirrer and a water distribution mechanism, an anoxic zone, an anaerobic zone, an aerobic zone, a precipitation separation zone and a deoxidation zone which are sequentially communicated are arranged in the treatment tank, and the deoxidation zone is communicated with the anoxic zone to form a circulation path; the plurality of aerators are respectively arranged in the aerobic zone and the precipitation separation zone, the plurality of three-phase separators are all arranged in the precipitation separation zone, the at least one first stirrer is arranged in the deoxidation zone, and the water distribution mechanism is respectively communicated with the anoxic zone and the anaerobic zone. The problems that in the prior art, different sewage treatment units are inconvenient to efficiently couple and cooperate, and different procedures such as biochemical reaction, precipitation separation and sludge backflow are difficult to complete in the same reaction device are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment device. Background Art

[0002] With the rapid development of technology, various new synthetic substances emerge in an endless stream, there are more and more polluting factors in sewage, and the chemical composition is becoming more and more complex. Therefore, environmental protection standards are becoming more and more stringent. In order to meet environmental protection requirements, sewage treatment processes are becoming more and more complicated, and there are more and more treatment structures and equipment, occupying more and more land, and the investment and operation costs of sewage treatment are getting higher and higher. Obviously, this runs counter to the current national concept of energy conservation, consumption reduction, low carbon and environmental protection.

[0003] In addition, there are certain interferences and influences between different treatment functional units, which are difficult to take into account. For example, biological denitrification and biological phosphorus removal require anoxic (dissolved oxygen less than 0.5 mg / L) and anaerobic (dissolved oxygen less than 0.2 mg / L) environments respectively. Both require sufficient carbon sources. There is a carbon source competition relationship between denitrifying bacteria and polyphosphate bacteria. The presence of nitrate has an inhibitory effect on the anaerobic phosphorus release of polyphosphate bacteria.

[0004] The traditional denitrification and phosphorus removal process adopts the "anaerobic → anoxic → aerobic" process flow. The sewage and return sludge first enter the anaerobic zone. The nitrate in the sewage will interfere with the normal anaerobic phosphorus release, thereby affecting the system's biochemical phosphorus removal. Studies have shown that when the mass concentration of NO3-N in the anaerobic zone is greater than 1.0 mg / L, it will inhibit the release of phosphorus by polyphosphate bacteria. When it reaches 3-4 mg / L, the phosphorus release behavior of polyphosphate bacteria is almost completely inhibited. Biological denitrification requires a long sludge age and less sludge discharge, while biological phosphorus removal requires a short sludge age and more sludge discharge. Often, the better the phosphorus removal effect, the poorer the denitrification effect, and vice versa. Therefore, it is a major challenge to reconcile the contradictions between the two and meet the needs of nitrogen and phosphorus removal at the same time; for example, when the aerobic tank and the sedimentation tank are built together, the aeration system is likely to interfere with the sedimentation system, affecting the mud-water separation in the sedimentation tank and the uniform distribution of activated sludge in the aerobic tank; when the aerobic tank and the sedimentation tank are built separately, because the sludge stays in the sedimentation tank for a long time, the bottom of the sedimentation tank is in an anoxic or anaerobic state. When the residual sludge is discharged, the phosphorus absorbed in excess by the activated sludge under aerobic conditions is likely to be released secondary, thereby affecting the phosphorus removal effect. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide a sewage treatment device to solve the problems in the prior art of inconvenient and efficient coupling and coordination between different sewage treatment units, and difficulty in completing different processes such as biochemical reaction, sedimentation separation and sludge return in the same reaction device.

[0006] In order to achieve the above technical purpose, the present invention adopts the following technical solutions:

[0007] The utility model provides a sewage treatment device, comprising:

[0008] A treatment tank, wherein the treatment tank is provided with an anoxic zone, an anaerobic zone, an aerobic zone, a sedimentation and separation zone, and a deoxygenation zone, which are connected in sequence, and the deoxygenation zone is connected to the anoxic zone to form a circulation path;

[0009] A plurality of aerators, wherein the plurality of aerators are respectively arranged in the aerobic zone and the sedimentation and separation zone;

[0010] A plurality of three-phase separators, wherein the plurality of three-phase separators are all arranged in the sedimentation separation zone;

[0011] A first agitator, at least one of the first agitators is disposed in the deoxidation zone; and

[0012] A water distribution mechanism is connected to the anoxic zone and the anaerobic zone respectively.

[0013] In some embodiments, a first guide wall is provided in the anoxic zone, and two flow gaps are formed between the first guide wall and the two opposite inner walls of the anoxic zone. The anoxic zone is also provided with two second agitators, and the two second agitators are respectively located on opposite sides of the first guide wall and respectively correspond to the two flow gaps.

[0014] In some embodiments, a second guide wall is fixedly provided in the anaerobic zone, a channel is formed between the second guide wall and the inner wall of the anaerobic zone, and two third agitators are also fixedly provided in the anaerobic zone, and the two third agitators are respectively located on opposite sides of the second guide wall, wherein one of the third agitators corresponds to the water inlet of the anaerobic zone, and the other third agitator corresponds to the channel.

[0015] In some embodiments, a mud drainage well is provided in the deoxidation zone, the top and bottom surfaces of the mud drainage well are both square, the bottom surface is flush with the bottom of the deoxidation zone, and the top surface is located at 1 / 2 of the height of the deoxidation zone. The angle between the inclined wall of the mud drainage well and the horizontal plane is 60°, and a mud drainage pump is provided at the inner bottom of the mud drainage well.

[0016] In some embodiments, the water distribution mechanism includes a water reservoir, an overflow wall is provided in the water reservoir, the overflow wall separates the water reservoir into a water inlet area and a water distribution area, a partition is provided in the water distribution area, the partition separates the water distribution area into two cavities, the sewage in the water inlet area can flow into the two cavities through the overflow wall, and the two cavities are respectively connected to the anoxic zone and the anaerobic zone through two water distribution pipes.

[0017] In some embodiments, the plurality of aerators are all connected to a blower, and a dissolved oxygen meter is also provided in the aerobic zone.

[0018] In some embodiments, the power of the first stirrer, the second stirrer and the third stirrer are all 8-10 W / m 3 .

[0019] In some embodiments, the aerator in the sedimentation and separation zone is located below the plurality of three-phase separators.

[0020] In some embodiments, the number of aerators in the aerobic zone facing the direction of sewage flow is arranged in a ratio of 2:1.5:1.

[0021] In some embodiments, the horizontal flow velocity of the sewage in the anoxic zone and the anaerobic zone is 0.3-0.5 m / s.

[0022] Compared with the prior art, the sewage treatment device provided by the present invention has an anoxic zone, an anaerobic zone, an aerobic zone, a sedimentation separation zone and a deoxygenation zone which are sequentially connected in the treatment pool, and the deoxygenation zone is connected to the anoxic zone to form a circulation path, multiple aerators are respectively arranged in the aerobic zone and the sedimentation separation zone, multiple three-phase separators are all arranged in the sedimentation separation zone, and at least one first agitator is arranged in the deoxygenation zone. The water distribution mechanism is connected to the anoxic zone and the anaerobic zone respectively; it can couple and coordinate different functional zones efficiently. At the same time, the water distribution mechanism can adjust the amount of sewage entering the anoxic zone and the anaerobic zone, so as to reasonably distribute the carbon source to meet the carbon source demand of denitrification and phosphorus removal, avoid the competition of biological denitrification and biological phosphorus removal for carbon source, and make full use of the carbon source in the sewage; the anoxic zone is placed before the anaerobic zone, and the nitrate in the sewage and return sludge is removed by denitrification, so as to avoid the nitrate inhibiting the release of phosphorus by polyphosphate bacteria in the anaerobic zone and affecting the biological phosphorus removal effect; the deoxygenation zone removes the residual air in the water to avoid increasing the dissolved oxygen in the anoxic zone after entering the anoxic zone, which affects the denitrification and denitrification effect of the anoxic zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a sewage treatment device provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] In order to solve the technical problems in the prior art that different sewage treatment units are inconveniently and efficiently coupled and coordinated, and different processes such as biochemical reaction, sedimentation separation and sludge return are difficult to complete in the same reaction device, the utility model provides a sewage treatment device, which can efficiently couple and coordinate different functional areas, and can complete different processes such as biochemical reaction, sedimentation separation and sludge return in the same reaction device, thereby improving the treatment device.

[0026] See also Figure 1 , Figure 1 A sewage treatment device in one embodiment of the present invention includes a treatment tank 1, multiple aerators 2, multiple three-phase separators 3, a first agitator 4 and a water distribution mechanism 5. The treatment tank 1 is provided with an anoxic zone 11, an anaerobic zone 12, an aerobic zone 13, a sedimentation separation zone 14 and a deoxygenation zone 15 connected in sequence, and the deoxygenation zone 15 is connected to the anoxic zone 11 to form a circulation path; multiple aerators 2 are respectively arranged in the aerobic zone 13 and the sedimentation separation zone 14; multiple three-phase separators 3 are all arranged in the sedimentation separation zone 14; at least one first agitator is arranged in the deoxygenation zone 15; and the water distribution mechanism 5 is respectively connected to the anoxic zone 11 and the anaerobic zone 12.

[0027] In this specific embodiment, the treatment pool 1 is a rectangular structure as a whole. A wall is provided in the treatment pool 1 to separate the interior of the treatment pool 1 into an anoxic zone 11, an anaerobic zone 12, an aerobic zone 13, a sedimentation and separation zone 14 and a deoxygenation zone 15.

[0028] On the basis of the above scheme, a first guide wall 111 is provided in the anoxic zone 11, and two flow gaps are formed between the first guide wall 111 and the two opposite inner walls of the anoxic zone 11. The anoxic zone 11 is also provided with two second agitators 112, and the two second agitators 112 are respectively located on opposite sides of the first guide wall 111, and respectively correspond to the two flow gaps.

[0029] Specifically, the nitrate / nitrite nitrogen in the water is reduced to nitrogen gas by denitrification in the anoxic zone 11. The power of the two second agitators 112 in the anoxic zone 11 is 8-10W / m 3 , which can promote the mud-water mixture in the anoxic zone 11 to circulate along the first guide wall 111, with a horizontal flow rate of 0.3-0.5m / s, and can ensure that the influent, return flow mixture and sludge are fully mixed and prevent sludge deposition. The anoxic zone is placed before the anaerobic zone, and the nitrate in the sewage and return flow sludge is removed by denitrification, so as to avoid the nitrate inhibiting the release of phosphorus by the polyphosphate bacteria in the anaerobic zone and affecting the biological phosphorus removal effect.

[0030] On the basis of the above scheme, a second guide wall 121 is fixedly provided in the anaerobic zone 12, and a channel is formed between the second guide wall 121 and the inner wall of the anaerobic zone 12. Two third agitators 122 are also fixedly provided in the anaerobic zone 12, and the two third agitators 122 are respectively located on opposite sides of the second guide wall 121, wherein one of the third agitators 122 corresponds to the water inlet of the anaerobic zone 12, and the other third agitator 122 corresponds to the channel.

[0031] It should be noted that the anaerobic zone 12 is located after the anoxic zone 11, and phosphorus is released into the sewage through the phosphate-accumulating bacteria. The power of the two third agitators 122 in the anaerobic zone 12 is 8-10W / m 3 , pushing the mud-water mixture in the anaerobic zone 12 to flow along the second guide wall 121, with a horizontal flow rate of 0.3-0.5m / s, to ensure that the incoming water and sludge are fully mixed and prevent sludge deposition.

[0032] Specifically, the aerobic zone 13 is located after the anaerobic zone 12. Nitrifying bacteria convert ammonia nitrogen in the sewage into nitrate / nitrite nitrogen, phosphate-accumulating bacteria absorb phosphorus in the water to form phosphorus-rich sludge, and aerobic microorganisms remove organic matter and other pollutants in the water. The sludge concentration in the aerobic zone 13 is 3-5g / L (controlled according to the concentration of pollutants in the incoming water). Multiple aerators 2 are installed at the bottom of the treatment tank 1 to form microbubbles of air in the water, thereby improving the efficiency of oxygen transfer and utilization, and promoting uniform mixing of sewage and activated sludge.

[0033] Among them, the multiple aerators 2 are all connected to the blower, and the aerobic zone 13 is also provided with a dissolved oxygen meter, which detects the dissolved oxygen content in the aerobic zone 13 and adjusts the air supply through the blower to control the dissolved oxygen in the pool at 2-4 mg / L.

[0034] Furthermore, the number of aerators 2 within the aerobic zone 13, facing the direction of sewage flow, is arranged in a ratio of 2:1.5:1. The pollutant concentration at the inlet of the aerobic zone 13 is higher, requiring more dissolved oxygen. As the pollutant concentration decreases along the water flow, the required dissolved oxygen decreases. Therefore, more aerators are arranged at the front end of the aerobic zone, with the number gradually decreasing along the water flow. This facilitates the regulation of dissolved oxygen, avoids excessively high dissolved oxygen at the end, and thus reduces energy consumption.

[0035] It should be noted that a sludge discharge well 151 is provided in the deoxygenation zone 15. The top and bottom surfaces of the sludge discharge well 151 are both square. The bottom surface is flush with the bottom of the deoxygenation zone 15, and the top surface is located at 1 / 2 of the height of the deoxygenation zone 15. The angle between the inclined wall of the sludge discharge well 151 and the horizontal plane is 60°, and a sludge discharge pump 152 is provided at the inner bottom of the sludge discharge well 151; specifically, since there is no aeration in the deoxygenation zone 15, the mud-water mixture will be separated at the sludge discharge well 151, and the sludge will sink. The remaining sludge (phosphorus-rich sludge) will be discharged regularly through the sludge discharge pump 152 at the bottom of the sludge discharge well 151 to remove phosphorus.

[0036] In this specific embodiment, multiple three-phase separators 3 can be set up in parallel according to the amount of water to be processed, and the surface load is 1.5m 3 / m 2 ·h, the load of the outlet weir of the three-phase separator 3 is ≤1.0L / m·s; in addition, unlike the traditional sedimentation tank, the aerator 2 in the sedimentation and separation zone 14 is located below the multiple three-phase separators 3, and the bottom of the sedimentation and separation zone 14 is continuously aerated. The density difference between the formed gas-water mixture and the mud or water forms different movement paths and the mud, water and gas three-phase separation. After gas separation, it escapes from the surface of the treatment tank 1, the sludge sinks to the bottom of the aerobic zone, and the clean water is discharged through the outlet weir of the three-phase separator 3.

[0037] The deoxidation zone is located after the aerobic zone, and the end is connected to the front end of the anoxic zone. A submersible mixer is provided. The power of the first mixer 4 is 8-10W / m 3 The deoxygenation zone disperses the residual air (oxygen) brought in from the aerobic zone after being fully mixed and stirred by the first agitator 4, so as to avoid increasing the dissolved oxygen in the anoxic zone (the dissolved oxygen in the anoxic zone needs to be lower than 0.5 mg / L) after entering the anoxic zone, which affects the denitrification and denitrification effect of the anoxic zone.

[0038] In this specific embodiment, the water distribution mechanism 5 includes a water reservoir 51, an overflow wall 52 is provided in the water reservoir 51, the overflow wall 52 separates the water reservoir 51 into a water inlet area 510 and a water distribution area 511, a partition 53 is provided in the water distribution area 511, the partition 53 separates the water distribution area 511 into two cavities, the sewage in the water inlet area 510 can flow into the two cavities through the overflow wall 52, and the two cavities are respectively connected to the anoxic zone 11 and the anaerobic zone 12 through two water distribution pipes.

[0039] It should be noted that the water distribution mechanism 5 is a rectangular structure, the top surface of the overflow wall 52 is about 400 mm lower than the top surface of the water distribution tank 51, and the water distribution area 511 is divided into two parts by the middle partition. The position of the partition is set according to the carbon source requirement of the denitrification and phosphorus removal treatment process, and the sewage distribution ratio is adjusted to avoid competition for carbon sources between biological denitrification and biological phosphorus removal, thereby improving the carbon source utilization rate.

[0040] In order to better understand the present invention, the following Figure 1 The technical solution of the utility model is described in detail:

[0041] The sewage first enters the water inlet area through the water inlet pipe, then overflows from the top of the overflow wall 52 into the two chambers, and is distributed to the anoxic zone 11 and the anaerobic zone 12 according to the proportion. The influent of the anoxic zone 11 and the nitrified liquid flowing from the deoxygenation zone 15 are fully mixed by the second agitator 112. The denitrifying bacteria use the carbon source in the influent to reduce the nitrate / nitrite in the refluxed nitrified liquid to nitrogen gas, thereby removing the total nitrogen in the sewage. The mixed liquid after denitrification flows into the anaerobic zone 12. The polyphosphate bacteria use the carbon source in the influent to decompose the polyphosphate into phosphate and release it into the water. The third agitator 122 in the anaerobic zone 12 pushes the mud-water mixture to flow along the second guide wall 121, ensuring that the influent and the sludge are fully mixed and preventing sludge deposition, thereby ensuring the phosphorus release effect of the polyphosphate bacteria.

[0042] The effluent from the anaerobic zone 12 after sufficient phosphorus release enters the aerobic zone 13. Multiple aerators 2 blow air into the aerobic zone 13. Aerobic microorganisms decompose the organic matter in the water into carbon dioxide and water through aerobic metabolism. When the organic matter in the sewage is gradually consumed, the nitrifying bacteria in the sewage oxidize ammonia nitrogen into nitrate nitrogen. As the pollution load gradually decreases along the water flow direction, the demand for dissolved oxygen gradually decreases, so the distribution density of the microporous aerator decreases. The three-phase separator 3 separates the mud, water and gas into three phases. After the gas is separated, it overflows from the surface of the pool, and the sludge sinks into the bottom of the aerobic zone. The clean water passes through the three-phase separation module. The effluent from the aerobic zone 13 (nitrification liquid, mud-water mixture) contains residual air (oxygen) after being discharged from the effluent weir, which will seriously inhibit the denitrification and denitrification in the anoxic zone 11. Therefore, the first agitator 4 is used to fully release the residual air (oxygen) in the mixed liquid. During the sewage treatment process, suspended impurities and microbial metabolic growth in the water will manifest in the form of sludge. In order to maintain the stability of the sludge concentration, it is necessary to regularly remove the proliferated sludge. In addition, during the treatment process in the aerobic zone, phosphate-accumulating bacteria will absorb excessive amounts of phosphorus and attach to the sludge. It is necessary to remove the total phosphorus in the water by discharging the excess sludge.

[0043] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A sewage treatment device, characterized in that: include: A treatment tank, wherein the treatment tank is provided with an anoxic zone, an anaerobic zone, an aerobic zone, a sedimentation and separation zone, and a deoxygenation zone, which are connected in sequence, and the deoxygenation zone is connected to the anoxic zone to form a circulation path; A plurality of aerators, wherein the plurality of aerators are respectively arranged in the aerobic zone and the sedimentation and separation zone; A plurality of three-phase separators, wherein the plurality of three-phase separators are all arranged in the sedimentation separation zone; A first agitator, at least one of the first agitators is disposed in the deoxidation zone; and A water distribution mechanism is connected to the anoxic zone and the anaerobic zone respectively.

2. A sewage treatment device according to claim 1, characterized in that: A first guide wall is provided in the anoxic zone, and two flow gaps are formed between the first guide wall and the two opposite inner walls of the anoxic zone. The anoxic zone is also provided with two second agitators, which are respectively located on opposite sides of the first guide wall and correspond to the two flow gaps respectively.

3. A sewage treatment device according to claim 2, characterized in that: A second guide wall is fixedly provided in the anaerobic zone, and a channel is formed between the second guide wall and the inner wall of the anaerobic zone. Two third agitators are also fixedly provided in the anaerobic zone, and the two third agitators are respectively located on opposite sides of the second guide wall, wherein one of the third agitators corresponds to the water inlet of the anaerobic zone, and the other third agitator corresponds to the channel.

4. A sewage treatment device according to claim 1, characterized in that: A mud drainage well is provided in the deoxidation zone. The top and bottom surfaces of the mud drainage well are both square. The bottom surface is flush with the bottom of the deoxidation zone, and the top surface is located at 1 / 2 of the height of the deoxidation zone. The angle between the inclined wall of the mud drainage well and the horizontal plane is 60°, and a mud drainage pump is provided at the inner bottom of the mud drainage well.

5. A sewage treatment device according to claim 1, characterized in that: The water distribution mechanism includes a water reservoir, an overflow wall is provided in the water reservoir, the overflow wall separates the water reservoir into a water inlet area and a water distribution area, a partition is provided in the water distribution area, the partition separates the water distribution area into two cavities, the sewage in the water inlet area can flow into the two cavities through the overflow wall, and the two cavities are respectively connected to the anoxic zone and the anaerobic zone through two water distribution pipes.

6. A sewage treatment device according to claim 1, characterized in that: The plurality of aerators are all connected to a blower, and a dissolved oxygen meter is also provided in the aerobic zone.

7. A sewage treatment device according to claim 3, characterized in that: The power of the first stirrer, the second stirrer and the third stirrer are all 8-10W / m 3 .

8. A sewage treatment device according to claim 1, characterized in that: The aerator in the sedimentation and separation zone is located below the multiple three-phase separators.

9. A sewage treatment device according to claim 1, characterized in that: The number of aerators in the aerobic zone facing the direction of sewage flow is arranged in a ratio of 2:1.5:

1.

10. A sewage treatment device according to claim 1, characterized in that: The horizontal flow velocity of the sewage in the anoxic zone and the anaerobic zone is 0.3-0.5 m / s.

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