CN213060364U - Nitrogen and phosphorus removal contact oxidation sewage treatment device - Google Patents
Nitrogen and phosphorus removal contact oxidation sewage treatment device Download PDFInfo
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- CN213060364U CN213060364U CN202021135301.2U CN202021135301U CN213060364U CN 213060364 U CN213060364 U CN 213060364U CN 202021135301 U CN202021135301 U CN 202021135301U CN 213060364 U CN213060364 U CN 213060364U
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Abstract
The utility model provides a nitrogen and phosphorus removal contact oxidation sewage treatment device, aims at overcoming the biological contact oxidation equipment single structure that is used for rural sewage treatment in the prior art, the filler easily hardens, the defect that nitrogen and phosphorus removal ability is low, provides a nitrogen and phosphorus removal contact oxidation sewage treatment device, and this equipment includes: the water inlet pipe is arranged at the lower end of the shell, and the water outlet pipe is arranged at the upper end of the shell; an annular baffle coaxial with the shell is arranged in the shell; the bottom of the shell forms an anaerobic zone; an anoxic zone is formed in the annular baffle, and the lower end of the anoxic zone corresponds to the central part of the anaerobic zone; an aerobic zone is formed between the shell and the annular baffle, and the lower end of the aerobic zone corresponds to the periphery of the anoxic zone. The utility model discloses a sewage treatment device nitrogen and phosphorus removal is efficient, area is little, the low energy consumption, is fit for the rural sewage treatment that the water yield is little, the emission is dispersed.
Description
Technical Field
The utility model relates to a sewage treatment field especially relates to a nitrogen and phosphorus removal contact oxidation sewage treatment device.
Background
Rural sewage has the characteristics of small water uptake, dispersed discharge, large change of water quality and water quantity and the like, and the current common treatment process for the sewage is a biological contact oxidation method. The biological contact oxidation method is a biological treatment technology between an activated sludge method and a biological filter, and the basic principle is that a filler is arranged in an aeration tank and is used as a carrier of a biological film, and the combined action of the biological film and suspended activated sludge is utilized to purify sewage. The biological contact oxidation method is a high-efficiency sewage treatment process with high organic load, strong impact load resistance, no sludge expansion, high treatment efficiency, simple operation, flexible operation and small occupied area. However, the development and application of the traditional biological contact oxidation process are limited by the problems of single structure of the tank body, easy hardening of the filler, low nitrogen and phosphorus removal capability and the like.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes the defects of single structure, easy hardening of filler and low nitrogen and phosphorus removal capability of biological contact oxidation equipment for rural sewage treatment in the prior art, and provides the nitrogen and phosphorus removal contact oxidation sewage treatment equipment.
The technical scheme adopted for realizing the purpose of the utility model is as follows: a nitrogen and phosphorus removal contact oxidation sewage treatment device comprises: the lower extreme of cylindrical casing is equipped with the inlet tube, and the upper end of casing is equipped with the outlet pipe. The anaerobic biological biofilm reactor is characterized in that an annular baffle coaxial with the shell is arranged in the shell, the outer wall of the annular baffle is connected with the inner wall of the shell through a baffle bracket, an anaerobic biological biofilm is arranged in the annular baffle, and the upper edge of the annular baffle is lower than the upper edge of the shell wall of the shell. An aerobic biofilm is arranged between the shell and the annular baffle, an air inlet pipe is arranged on the baffle support between the shell and the annular baffle, the air inlet pipe surrounds the periphery of the annular baffle, the air inlet end of the air inlet pipe is arranged outside the shell, and a group of aerators is uniformly arranged on the air inlet pipe. The bottom of casing is equipped with the anaerobism biofilm carrier, is equipped with the perforation inlet tube that encircles in the anaerobism biofilm carrier, and the size that encircles of perforation inlet tube is greater than the size that encircles of intake pipe, and the perforation inlet tube communicates with the inlet tube. The upper end of the inner wall of the shell is provided with a water outlet groove, the upper edge of the groove wall of the water outlet groove and the upper edge of the annular baffle are positioned on the same horizontal plane, and the water outlet groove is communicated with the water outlet pipe.
The bottom of the shell forms an anaerobic zone; an anoxic zone is formed in the annular baffle, and the lower end of the anoxic zone corresponds to the central part of the anaerobic zone; an aerobic zone is formed between the shell and the annular baffle, and the lower end of the aerobic zone corresponds to the periphery of the anoxic zone.
Furthermore, a backflow weir plate is arranged at the upper end of the wall of the annular baffle plate, and the upper edge of the backflow weir plate is lower than the upper edge of the shell wall of the shell; and the wall of the water outlet groove is provided with a water outlet weir plate, and the upper edge of the water outlet weir plate and the upper edge of the reflux weir plate are positioned on the same horizontal plane.
Furthermore, the reflux weir plate and the water outlet weir plate are provided with rectangular weirs or triangular weirs.
Further, the apparatus further comprises: and the secondary sedimentation tank is communicated with the water outlet groove of the shell through a water outlet pipe.
Furthermore, the lower end of the shell is also provided with a sludge discharge pipe which is communicated with the anaerobic zone at the bottom of the shell.
Furthermore, the aerobic biofilm formation support is arranged between the shell and the annular baffle plate, and the aerobic biofilm formation support is arranged between the inner wall of the shell and the outer wall of the annular baffle plate; the anoxic biofilm is arranged in the annular baffle plate through an anoxic biofilm hanging bracket, and the anoxic biofilm hanging bracket is arranged on the annular baffle plate.
The utility model has the advantages that: (1) the sewage treatment equipment of the utility model has simple subareas, simple process flow and small occupied area, and saves capital investment.
(2) Utilize the utility model discloses a sewage treatment device carries out sewage treatment, and sewage is in turn moved under anaerobism, oxygen deficiency, good oxygen environment, is favorable to inhibiting filamentous fungus's inflation, guarantees whole sewage treatment's stability and lasts.
(3) The contact oxidation equipment combines the anaerobic process and the contact oxidation process, utilizes the phosphorus-accumulating bacteria in the anaerobic zone to release phosphorus, and utilizes the phosphorus-accumulating bacteria in the aerobic zone to absorb the phosphorus in excess, thereby achieving the purpose of removing the phosphorus.
(4) The contact oxidation equipment combines the anoxic process and the contact oxidation process, utilizes the reflux effect of the nitrified liquid, and conveys the nitrified liquid with higher nitrate concentration generated in the aerobic zone to the anoxic zone, thereby not only providing denitrification raw materials for the anoxic zone, but also reducing the accumulation of oxygen in the aerobic zone; meanwhile, the reflux mode is combined with the denitrification process, so that the denitrification efficiency is improved.
(5) The contact oxidation equipment forms internal reflux by utilizing the air lift effect, does not need to use a reflux pump, reduces energy consumption and reduces operation cost.
(6) The utility model relates to a contact oxidation sewage treatment device with high nitrogen and phosphorus removal efficiency, small occupied area and low energy consumption, which is suitable for rural sewage treatment with small water amount and dispersed emission, and the process of the utility model discloses a sewage, NH treated by the device3The removal rate of-N can reach more than 80 percent, TN can reach 50 percent, the removal rate of TP can reach 70 percent, and COD and BOD5The removal rate can reach 70 percent.
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
Fig. 1 is a top view of the present invention.
Fig. 2 is a sectional view taken along line a-a of fig. 1.
Fig. 3 is a sectional view taken along line B-B of fig. 1.
Fig. 4 is a partial enlarged view C of fig. 3.
In the attached drawing, 1 is a shell, 1-1 is an annular baffle, 1-1-1 is a reflux weir plate, 1-2 is a baffle support, 1-3 is an air inlet pipe, 1-3-1 is an aerator, 1-4 is a perforated water inlet pipe, 1-5 is a water outlet tank, 1-5-1 is a water outlet weir plate, 2 is a water inlet pipe, 3 is a water outlet pipe, and 4 is a sludge discharge pipe.
Detailed Description
As shown in the attached drawings, the nitrogen and phosphorus removal contact oxidation sewage treatment equipment of the embodiment comprises: cylindrical casing 1, the lower extreme of casing is equipped with inlet tube 2, and the upper end of casing is equipped with outlet pipe 3, and whole equipment is the cylinder as an organic whole, and area is little, saves space.
An annular baffle plate 1-1 coaxial with the shell is arranged in the shell 1, the outer wall of the annular baffle plate 1-1 is connected with the inner wall of the shell 1 through a baffle plate bracket 1-2, and in order to ensure that the annular baffle plate 1-1 is firmly connected in the shell 1, the bracket 1-2 is preferably an angle steel bracket. The interior of the housing 1 is divided into two regions by means of an annular baffle 1-1: the area within the annular baffle 1-1 and the area between the housing 1 and the annular baffle 1-1. The dissolved oxygen content of the sewage in the annular baffle plate 1-1 is kept at 0.2-0.5mg/L, then an anoxic zone is formed in the area in the annular baffle plate 1-1, an anoxic biological biofilm is arranged in the annular baffle plate 1-1, and the biological biofilm is rich in denitrifying bacteria and is used for treating nitrate in the sewage and carrying out denitrification treatment on the nitrate. The upper edge of the annular baffle plate 1-1 is lower than the upper edge of the shell wall of the shell 1, so that sewage can flow back from the outside of the annular baffle plate 1-1 to the inside of the annular baffle plate 1-1.
An aerobic biofilm is arranged between the shell 1 and the annular baffle 1-1, an air inlet pipe 1-3 is arranged on a baffle support 1-2 between the shell 1 and the annular baffle 1-1, the air inlet pipe 1-3 surrounds the annular baffle 1-1, the air inlet end of the air inlet pipe 1-3 is arranged outside the shell 1, and a group of aerators 1-3-1 is uniformly arranged on the air inlet pipe 1-3. A group of aerators 1-3-1 are distributed between the periphery of the annular baffle 1-1 and the shell 1 in a surrounding way through an air inlet pipe 1-3, so that dissolved oxygen is provided for sewage in a part of area, the dissolved oxygen content of the sewage is kept above 2mg/L, an aerobic area is formed in the area between the shell 1 and the annular baffle 1-1, meanwhile, an aerobic biofilm is arranged in the aerobic area, the aerobic biofilm carries out oxidative decomposition on organic matters and nitration reaction on organic nitrogen and ammonia nitrogen to convert the organic nitrogen and the ammonia nitrogen into nitrate, and the sewage after aerobic biochemical treatment is also called nitrifying liquid.
Anaerobic biological filler is arranged at the bottom of the shell 1, a circular perforated water inlet pipe 1-4 is arranged in the anaerobic biological filler, the circular size of the perforated water inlet pipe 1-4 is larger than that of the air inlet pipe 1-3, and the perforated water inlet pipe 1-4 is communicated with the water inlet pipe 2. Sewage enters the shell 1 from the bottom of the shell 1 through the perforated water inlet pipes 1-4, the dissolved oxygen content of the part of the sewage at the bottom of the shell 1 is lower than 0.2mg/L, an anaerobic zone is formed, meanwhile, the anaerobic biological filler at the bottom of the shell 1 is rich in denitrifying phosphorus accumulating bacteria, and phosphorus stored in the body can be released to obtain energy. The central part of the anaerobic zone corresponds to the lower end of the anoxic zone, and the peripheral part of the anaerobic zone corresponds to the lower end of the aerobic zone, so that sewage entering the shell 1 can flow among the anaerobic zone, the aerobic zone and the anoxic zone.
The upper end of the inner wall of the shell 1 is provided with a water outlet groove 1-5, the upper edge of the water outlet groove 1-5 and the upper edge of the annular baffle plate 1-1 are positioned at the same horizontal plane, the water outlet groove 1-5 is communicated with a water outlet pipe 3, the arrangement can ensure that a part of sewage in the aerobic zone can flow back into the anaerobic zone in the annular baffle plate 1-1, and the other part of sewage enters the water outlet groove 1-5 and flows out of the shell 1 through the water outlet pipe 3.
In the embodiment, the upper end of the wall of the preferable annular baffle 1-1 is provided with a reflux weir plate 1-1-1, and the upper edge of the reflux weir plate 1-1-1 is lower than the upper edge of the shell wall of the shell 1; the wall of the water outlet groove 1-5 is provided with a water outlet weir plate 1-5-1, and the upper edge of the water outlet weir plate 1-5-1 and the upper edge of the reflux weir plate 1-1 are in the same horizontal plane. Preferably, the reflux weir plate 1-1-1 and the effluent weir plate 1-5-1 are provided with rectangular weirs or triangular weirs for adjusting the reflux and effluent of the sewage.
This preferred equipment of this embodiment still includes: and the secondary sedimentation tank can realize mud-water separation and is communicated with the water outlet grooves 1-5 of the shell 1 through the water outlet pipe 3.
The lower extreme of the preferred casing 1 of this embodiment still is equipped with mud pipe 4, and mud pipe 4 communicates with the anaerobic zone of casing 1 bottom, can clear up the remaining mud of system out casing 1 through mud pipe 4, guarantees the sewage treatment system steady operation in the casing 1.
The aerobic biofilm culturing support is arranged between the shell 1 and the annular baffle 1-1, and the aerobic biofilm culturing support is arranged between the inner wall of the shell 1 and the outer wall of the annular baffle 1-1; the anoxic biofilm is arranged in the annular baffle through an anoxic biofilm hanging bracket, and the anoxic biofilm hanging bracket is arranged on the annular baffle 1-1.
In order to improve the dephosphorization effect of the contact oxidation technology, the sewage treatment equipment is provided with an anaerobic zone and an aerobic zone, sewage firstly enters the anaerobic zone, at the moment, activated sludge is in an anaerobic state in a short time, and the polyphosphate is decomposed by the polyphosphate accumulating bacteria to provide energy and release phosphorus, so that the phosphorus content in the sewage is increased. Then the sewage enters an aerobic zone, phosphorus accumulating bacteria carry out aerobic respiration, and a large amount of phosphorus released in an anaerobic stage and phosphorus in raw sewage are absorbed by utilizing energy obtained by oxidative decomposition, so that the transitional accumulation and excessive absorption of phosphorus are completed, and polyphosphate is synthesized in a cell body and stored, thereby achieving the purpose of removing phosphorus.
For solving the problems of lower denitrification efficiency and high reflux energy consumption of the contact oxidation method, the utility model discloses set up the anoxic zone, sewage carries out nitration reaction in the aerobic zone, and ammonia oxidation is nitrite and nitrate. The air rising from the aerobic zone can be used as a power source for stripping nitrified liquid and flowing back to the anoxic zone for denitrification, so that nitrate, nitrite and other nitrogen oxides are reduced into nitrogen, and the denitrification effect is enhanced. And the process does not need to independently set a reflux pump for reflux, so that the energy consumption of the system is reduced, because: the aerobic zone and the anoxic zone generate liquid level difference in the aeration process of the bottom part of the aerobic zone, conditions are created for backflow, the backflow weir plate 1-1-1 is arranged at the top of the annular baffle plate 1-1, the backflow of nitrified liquid is facilitated, and the nitrified liquid can flow back without additionally arranging a backflow pump.
By using the sewage treatment equipment of the utility model, the flowing direction of sewage is realized jointly by the perforated water inlet pipe 1-4, the aerator 1-3-1 and the annular baffle plate 1-1, the perforated water inlet pipe 1-4 is arranged in the anoxic zone and is positioned at the lower end of the aerobic zone, so that most sewage enters the aerobic zone from bottom to top, and a small part of sewage enters the anoxic zone from bottom to top. Under the action of the aerator 1-3-1 of the aerobic zone, sewage flows from the bottom to the top of the aerobic zone through air lift. The sewage enters a steam-water separation zone and is divided into two parts: part of the nitrified liquid obtained after the aerobic biochemical treatment flows back to the anoxic zone through a reflux weir plate 1-1-1 connected with the annular baffle plate 1-1; the other part of the water outlet weir plate 1-5-1 enters the water outlet groove 1-5 and then flows out of the shell 1 through the water outlet pipe 3. The returned nitrifying liquid flows from top to bottom in the annular baffle 1-1, is contacted and mixed with a small part of raw water in the anaerobic zone at the bottom, then enters the aerobic zone through the circulating channel at the bottom of the annular baffle 1-1, and starts the next step of circulating operation.
A process for carrying out sewage treatment by utilizing the nitrogen and phosphorus removal contact oxidation sewage treatment equipment comprises the following steps: a. sewage flows into the equipment through the water inlet pipe and flows into an anaerobic zone at the bottom of the shell through the perforated water inlet pipe, and anaerobic biological filler in the anaerobic zone carries out anaerobic biochemical treatment on the sewage; b. b, with the rising of the water level, a part of the water treated in the step a enters an aerobic zone between the shell and the annular baffle, and a part of the water enters an anoxic zone in the annular baffle; c. b, carrying out anoxic biochemical treatment on the water entering the anoxic zone along with the rising of the water level through an anoxic biofilm in the step b; d. b, carrying out aerobic biochemical treatment on the water entering the aerobic zone along with the rise of the water level through an aerobic biofilm formation; meanwhile, along with the rise of the water level, water in the aerobic zone flows into the anoxic zone through the reflux weir plate under the action of aeration, and the other part of the water flows into the water outlet groove through the water outlet weir plate; e. d, the water entering the water outlet groove through the water outlet weir plate flows out of the sewage treatment equipment through the water outlet pipe; f. d, allowing the water entering the anoxic zone through the reflux weir plate to flow into the anoxic zone from top to bottom, mixing the water with the water subjected to anoxic biochemical treatment in the step c, and performing anoxic biochemical treatment through an anoxic biological biofilm; g. and f, allowing the water treated in the step f to flow from top to bottom, allowing the water to enter the anaerobic zone, mixing the water with the raw water in the anaerobic zone, and continuing the treatment in the steps a, b, c, d, e and f.
In the sewage treatment process, the water in the step e flows into a secondary sedimentation tank through a water outlet pipe to carry out mud-water separation. In addition, the sewage treatment step further comprises: and h, cleaning sludge settled at the bottom of the sewage treatment equipment through a sludge discharge pipe.
In step a, sewage enters an anaerobic zone, denitrifying bacteria are dense due to low dissolved oxygen content in the zone, and anaerobic phosphorus accumulating bacteria release phosphorus. In the step c, the sewage after anaerobic treatment enters an anoxic zone for anoxic biochemical treatment, and at the moment, denitrifying bacteria on a biomembrane of the anoxic zone carry out denitrification treatment on nitrate in the sewage under an anoxic condition to treat the nitrate in the sewage so as to achieve a denitrification effect. And d, allowing the sewage subjected to anaerobic treatment to enter an aerobic zone for aerobic biochemical treatment, wherein the water body has high dissolved oxygen content due to the aeration effect, and aerobic phosphorus accumulating bacteria are abundant and absorb a large amount of phosphorus released by the anaerobic zone and phosphorus brought by the sewage, so that the effect of removing phosphorus is achieved. And the mixed solution passes through the aerobic zone, the nitrifying bacteria in the mixed solution are rich, the sludge-water mixture flows from bottom to top under the action of aeration, and nitrification reaction is carried out under the action of the nitrifying bacteria to treat ammonia nitrogen and organic nitrogen in the sewage.
The utility model discloses a nitrogen and phosphorus removal contact oxidation sewage treatment device, the secondary treatment stage of mainly used rural sewage that the water yield is little, the emission dispersion, the quality of water of intaking that sewage treatment device designed is: COD: 300-400 mg/L, BOD5：200~300mg/L、NH3-N: 20-30 mg/L, TN: 25-40 mg/L, TP: 2-5 mg/L, and by detecting the water quality of the effluent, the following can be obtained: NH (NH)3The removal rate of-N is more than 80 percent, TN can reach 50 percent, the removal rate of TP can reach 70 percent, and COD and BOD5The removal rate can reach 70 percent, and the nitrogen and phosphorus removal effect is obvious.
Claims (6)
1. A nitrogen and phosphorus removal contact oxidation sewage treatment device comprises: the water inlet pipe is arranged at the lower end of the shell, and the water outlet pipe is arranged at the upper end of the shell;
the biological oxygen-deficient biological film hanging device is characterized in that an annular baffle (1-1) coaxial with the shell is installed in the shell (1), the outer wall of the annular baffle (1-1) is connected with the inner wall of the shell (1) through a baffle bracket (1-2), an oxygen-deficient biological film is arranged in the annular baffle (1-1), and the upper edge of the annular baffle (1-1) is lower than the upper edge of the shell wall of the shell (1);
an aerobic biofilm is arranged between the shell (1) and the annular baffle (1-1), an air inlet pipe (1-3) is arranged on a baffle bracket (1-2) between the shell (1) and the annular baffle (1-1), the air inlet pipe (1-3) surrounds the periphery of the annular baffle (1-1), the air inlet end of the air inlet pipe (1-3) is arranged outside the shell (1), and a group of aerators (1-3-1) are uniformly arranged on the air inlet pipe (1-3);
anaerobic biological filler is arranged at the bottom of the shell (1), a circular perforated water inlet pipe (1-4) is arranged in the anaerobic biological filler, the circular size of the perforated water inlet pipe (1-4) is larger than that of the air inlet pipe (1-3), and the perforated water inlet pipe (1-4) is communicated with the water inlet pipe (2);
the upper end of the inner wall of the shell (1) is provided with a water outlet groove (1-5), the upper edge of the wall of the water outlet groove (1-5) and the upper edge of the annular baffle plate (1-1) are positioned on the same horizontal plane, and the water outlet groove (1-5) is communicated with the water outlet pipe (3);
the bottom of the shell (1) forms an anaerobic zone; an anoxic zone is formed in the annular baffle (1-1), and the lower end of the anoxic zone corresponds to the central part of the anaerobic zone; an aerobic zone is formed between the shell (1) and the annular baffle (1-1), and the lower end of the aerobic zone corresponds to the periphery of the anoxic zone.
2. The apparatus for treating contact oxidation sewage of nitrogen and phosphorus removal as claimed in claim 1, wherein the upper end of the wall of the annular baffle (1-1) is provided with a reflux weir plate (1-1-1), the upper edge of the reflux weir plate (1-1-1) is lower than the upper edge of the wall of the shell (1); the wall of the water outlet groove (1-5) is provided with a water outlet weir plate (1-5-1), and the upper edge of the water outlet weir plate (1-5-1) and the upper edge of the reflux weir plate (1-1-1) are in the same horizontal plane.
3. The apparatus for treating nitrogen and phosphorus removal contact oxidation sewage as claimed in claim 2, wherein the reflux weir plate (1-1-1) and the effluent weir plate (1-5-1) are provided with rectangular weirs or triangular weirs.
4. The apparatus of claim 1, further comprising: and the secondary sedimentation tank is communicated with a water outlet groove (1-5) of the shell (1) through a water outlet pipe (3).
5. The sewage treatment equipment for nitrogen and phosphorus removal contact oxidation according to claim 1, wherein a sludge discharge pipe (4) is further arranged at the lower end of the shell (1), and the sludge discharge pipe (4) is communicated with an anaerobic zone at the bottom of the shell (1).
6. The contact oxidation sewage treatment device for nitrogen and phosphorus removal according to claim 1, wherein the aerobic biofilm is arranged between the shell (1) and the annular baffle (1-1) through an aerobic biofilm bracket, and the aerobic biofilm bracket is arranged between the inner wall of the shell (1) and the outer wall of the annular baffle (1-1); the anoxic biofilm is arranged in the annular baffle plate through an anoxic biofilm hanging bracket, and the anoxic biofilm hanging bracket is arranged on the annular baffle plate (1-1).
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| CN202021135301.2U CN213060364U (en) | 2020-06-18 | 2020-06-18 | Nitrogen and phosphorus removal contact oxidation sewage treatment device |
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| CN202021135301.2U CN213060364U (en) | 2020-06-18 | 2020-06-18 | Nitrogen and phosphorus removal contact oxidation sewage treatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477450A (en) * | 2022-02-25 | 2022-05-13 | 新疆德安环保科技股份有限公司 | Enhanced domestic sewage nitrogen and phosphorus removal treatment device and treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477450A (en) * | 2022-02-25 | 2022-05-13 | 新疆德安环保科技股份有限公司 | Enhanced domestic sewage nitrogen and phosphorus removal treatment device and treatment method |
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