Front oxygen-eliminating denitrification deep-bed filter device
By setting up an aeration tank before the denitrification deep bed filter and using reducing agents to pre-treat the denitrification influent, the problem of carbon source consumption caused by excessive dissolved oxygen is solved, achieving efficient denitrification treatment and reducing operating costs.
Patent Information
- Application Number
- CN202423192426.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-24
AI Technical Summary
In existing denitrification deep bed filter processes, excessive dissolved oxygen leads to a large increase in carbon source consumption, which in turn increases operating costs. Existing technologies cannot effectively reduce the carbon source consumption in denitrification treatment and further increase operating costs.
An aeration tank is set up before the denitrification deep bed filter. Reducing agents such as sodium thiosulfate, sodium sulfite, and sodium bisulfite are used to pre-treat the wastewater to reduce the dissolved oxygen content of the denitrification influent. The aeration agent is added efficiently through a deoxygenating agent delivery pipeline and a dosing pump.
It effectively reduces carbon source consumption in denitrification, improves denitrification efficiency, reduces operating costs, and allows for flexible modification of existing equipment.
Smart Images
Figure CN223633204U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of water treatment equipment, in particular to a pre-oxygen-consuming denitrification deep bed filter device. BACKGROUND
[0002] Nitrogen pollutants are a typical water pollutant, and the main forms of existence in the water environment include organic compounds (protein, urea, etc.) and inorganic compounds composed of ammonia nitrogen (NH4 + ), nitrite nitrogen (NO 2- ) and nitrate nitrogen (NO 3- ). Among them, the environmental pollution problem caused by excessive inorganic compounds is the most widespread. The denitrification process is a key step to completely remove nitrogen pollutants in wastewater, which generally occurs in anoxic or facultative anaerobic environment. Denitrifying microorganisms use NO x- as an electron acceptor and small-molecule organic matter as an electron donor to convert into N2O or N2 and discharge into the air.
[0003] The denitrification deep bed filter process is a high-efficiency denitrification treatment process widely used in recent years. The process can achieve denitrification and nitrogen removal by adding carbon source in the mixing pool at the inlet. The carbon source generally uses chemical agents such as sodium acetate, acetic acid and methanol. However, the carbon source not only serves as a nutrient for the reproduction of denitrifying bacteria in water, but also reacts with dissolved oxygen in water. Denitrifying bacteria are anaerobic microorganisms that can reproduce in large quantities in an environment with DO≤0.2mg / L. High dissolved oxygen in water is not conducive to the growth of denitrifying bacteria, so the carbon source will react with the dissolved oxygen in the water to reduce the dissolved oxygen to meet the conditions for the reproduction of denitrifying bacteria. The higher the dissolved oxygen in the water, the more carbon source will be consumed, which will greatly increase the operating cost. In addition, the reaction rate of carbon source and dissolved oxygen is slow, which will prolong the acclimation process of denitrifying bacteria.
[0004] At present, in order to reduce the consumption of carbon source by dissolved oxygen, a constant liquid level function is added to the operation control of the filter. The constant liquid level is controlled at 10-20cm below the inlet weir by the filter liquid level meter and the filter outlet adjusting valve, which reduces the increase of dissolved oxygen caused by water drop. However, the above-mentioned scheme is applied to the denitrification deep bed filter process of sewage treatment in China, and the effect is not obvious. CONTENT OF THE UTILITY MODEL
[0005] In order to solve at least one of the above technical problems, a denitrification device capable of effectively reducing the amount of dissolved oxygen in denitrification inlet water, reducing the consumption of carbon source in denitrification, and improving the efficiency of denitrification treatment is developed. The present application provides a pre-oxygen-consuming denitrification deep bed filter device.
[0006] The application provides a pre-oxygen-consuming denitrification deep bed filter device, comprising a denitrification deep bed filter, and further comprising an oxygen-consuming part; the oxygen-consuming part comprises an oxygen-consuming tank, the liquid inlet end of the oxygen-consuming tank is connected with a denitrification water inlet pipeline, and the liquid outlet end is connected with a mixing tank of the denitrification deep bed filter through a pipeline; the oxygen-consuming part further comprises an oxygen-consuming agent storage tank, the oxygen-consuming agent storage tank is connected with the oxygen-consuming tank through an oxygen-consuming agent conveying pipeline, and an oxygen-consuming agent dosing pump is arranged on the oxygen-consuming agent conveying pipeline.
[0007] Optionally, a stirrer is arranged in the oxygen-consuming tank.
[0008] Optionally, a dissolved oxygen analysis assembly is arranged in the oxygen-consuming tank.
[0009] Optionally, a plurality of oxygen-consuming agent conveying pipelines are arranged, and an oxygen-consuming agent dosing pump is arranged on each oxygen-consuming agent conveying pipeline.
[0010] Optionally, the denitrification deep bed filter comprises a mixing tank and a denitrification deep bed filter assembly, the liquid outlet end of the mixing tank is connected with the liquid inlet end of the denitrification deep bed filter assembly through a pipeline; the mixing tank is further connected with a carbon source dosing assembly through a pipeline; a stirrer is arranged in the mixing tank; the liquid outlet of the clean water and sewage of the denitrification deep bed filter assembly is connected with a clean water treatment assembly and a sewage treatment assembly through pipelines respectively.
[0011] More further optionally, the carbon source dosing assembly comprises a carbon source storage tank, the carbon source storage tank is connected with the mixing tank through a carbon source conveying pipeline, and a carbon source dosing pump is arranged on the carbon source conveying pipeline.
[0012] Further optionally, the clean water treatment assembly comprises a clean water tank.
[0013] More further optionally, the clean water tank is provided with a backwashing pipeline, and a backwashing water pump is arranged on the backwashing pipeline.
[0014] Further optionally, the sewage treatment assembly comprises a wastewater tank.
[0015] More further optionally, the wastewater tank is provided with a drainage pipeline, and a wastewater pump is arranged on the drainage pipeline.
[0016] In summary, the application has at least one of the following beneficial technical effects:
[0017] 1. This application adopts a design that sets up an aeration tank in front of the denitrification deep bed filter module to pre-treat the denitrification influent by deoxygenation. By adding readily available and highly reactive reducing agents, such as sodium thiosulfate, sodium sulfite, and sodium bisulfite, the dissolved oxygen content of the denitrification influent is reduced to an extremely low level in advance. This can greatly reduce the carbon source consumption of subsequent denitrification treatment, improve the efficiency of denitrification treatment, and effectively reduce operating costs.
[0018] 2. This application adopts an external deoxygenation section at the front of the denitrification treatment equipment, which can flexibly and conveniently modify the existing denitrification treatment equipment without changing the overall layout of the denitrification treatment equipment, and can effectively reduce the modification cost. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the pre-aeration denitrification deep bed filter device of this application;
[0020] Figure 2 This is a schematic diagram of the structure of the denitrification deep bed filter section of this application;
[0021] In the diagram: 1. Oxygen scavenger storage tank; 2. Oxygen scavenger dosing pump; 3. Agitator; 4. Oxygen scavenging tank; 5. Dissolved oxygen analysis module; 6. Denitrification deep bed filter; 61. Mixing tank; 62. Carbon source storage tank; 63. Carbon source dosing pump; 64. Denitrification deep bed filter module; 65. Wastewater tank; 66. Wastewater pump; 67. Clear water tank; 68. Backwash water pump. Detailed Implementation
[0022] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.
[0023] like Figure 1 As shown, this application designs a pre-deoxygenation denitrification deep bed filter device, including a denitrification deep bed filter 6. The pre-deoxygenation denitrification deep bed filter device also includes a deoxygenation section, which is located before the denitrification deep bed filter 6 and is an independent part.
[0024] The deoxygenation section includes a deoxygenation tank 4, whose inlet is connected to the denitrification influent pipeline, and whose outlet is connected to the mixing tank 61 of the denitrification deep bed filter 6 via a pipeline. The deoxygenation section also includes an oxygen-scavenging agent storage tank 1, which is connected to the deoxygenation tank 4 via an oxygen-scavenging agent delivery pipeline. An oxygen-scavenging agent dosing pump 2 is installed on the oxygen-scavenging agent delivery pipeline. The oxygen-scavenging agent storage tank 1 can be filled with various readily available and highly efficient reducing agents, such as sodium thiosulfate, sodium sulfite, and sodium bisulfite.
[0025] The operating principle of this application is as follows:
[0026] During operation, the wastewater requiring denitrification is first sent to the deaeration tank 4 via the denitrification inlet pipeline. Simultaneously, the deaeration agent dosing pump 2 pumps the reducing agent from the deaeration agent storage tank 1 into the deaeration tank 4, where a chemical reaction consumes the dissolved oxygen in the wastewater, reducing its concentration to an extremely low level. The deaeration-treated wastewater is then sent via pipeline to the denitrification deep bed filter 6 for further denitrification treatment, completing the entire denitrification process.
[0027] Unlike existing constant-level control technologies, which only reduce the increase of dissolved oxygen in the denitrification deep-bed filter 6, this method cannot reduce the dissolved oxygen concentration already present in the untreated wastewater. Aeration in the upstream biological treatment process, cascading water levels, and water flow all contribute to increased dissolved oxygen levels. Wastewater already contains high levels of dissolved oxygen before entering the denitrification deep-bed filter, consuming a large amount of carbon source, prolonging the reaction time, slowing the reproduction rate of denitrifying bacteria, and reducing the denitrification effect.
[0028] Based on the analysis of the problems in the prior art, the inventors designed the device of this application, which can effectively solve the technical problems existing in the prior art.
[0029] like Figure 1 As shown, in the optimized solution of this application, multiple oxygen-scavenging agent delivery pipelines can be set up, and each oxygen-scavenging agent delivery pipeline is equipped with an oxygen-scavenging agent dosing pump 2, which can improve the dosing efficiency.
[0030] The following are embodiments of this application.
[0031] Example 1
[0032] The pre-aeration denitrification deep bed filter device of this embodiment is consistent with the basic design of the present application.
[0033] In this embodiment, the deoxygenation tank 4 is equipped with a stirrer 3.
[0034] In this embodiment, the deoxygenation tank 4 is also equipped with a dissolved oxygen analysis component 5. The dissolved oxygen analysis component 5 in this embodiment can be any commercially available model of dissolved oxygen analyzer.
[0035] When the device in this embodiment is running, the sewage is sent to the deoxygenation tank 4 through the denitrification inlet pipeline. The dissolved oxygen analysis component 5 will detect the dissolved oxygen concentration of the sewage in the deoxygenation tank 4 in real time. At the same time, the deoxygenating agent dosing pump 2 pumps the reducing agent in the deoxygenating agent storage tank 1 into the deoxygenation tank 4. The stirrer 3 works, and under the stirring, the deoxygenation tank 4 reacts efficiently to remove as much dissolved oxygen as possible from the sewage.
[0036] The device of the embodiment can operate and control the operation frequency of the oxygen scavenger dosing pump 2 according to the detection data of the dissolved oxygen analysis assembly 5, and relatively accurately control the dosing. Not only the operation cost can be further reduced, but also a large amount of reducing agent can not be mixed into the subsequent denitrification treated sewage, and the denitrification treatment is affected.
[0037] Embodiment 2
[0038] The structure of the embodiment is basically similar to that of embodiment 1, and the difference lies in that the denitrification deep bed filter 6 is further optimized and designed.
[0039] The denitrification deep bed filter 6 includes a mixing tank 61 and a denitrification deep bed filter assembly 64, the liquid outlet of the mixing tank 61 is connected with the liquid inlet of the denitrification deep bed filter assembly 64 through a pipeline, and the liquid outlets of the clean water and the sewage of the denitrification deep bed filter assembly 64 are connected with a clean water treatment assembly and a sewage treatment assembly through pipelines, respectively.
[0040] The mixing tank 61 is further connected with a carbon source dosing assembly through a pipeline. The mixing tank 61 is provided with a stirrer 3. The carbon source dosing assembly includes a carbon source storage tank 62, which is connected with the mixing tank 61 through a carbon source conveying pipeline, and a carbon source dosing pump 63 is arranged on the carbon source conveying pipeline.
[0041] The clean water treatment assembly includes a clean water tank 67, which is provided with a backwashing pipeline, and a backwashing water pump 68 is arranged on the backwashing pipeline.
[0042] The sewage treatment assembly includes a wastewater tank 65, which is provided with a drainage pipeline, and a wastewater pump 66 is arranged on the drainage pipeline.
[0043] During the operation of the device of the embodiment, the oxygen scavenging process is basically the same as that of embodiment 1. The carbon source dosing pump 63 pumps the carbon source in the carbon source storage tank 62 into the mixing tank 61, and the stirrer 3 works to complete the carbon source dosing and mixing while the sewage treated by the oxygen scavenging process enters the mixing tank 61. Then, the sewage enters the denitrification deep bed filter assembly 64 for denitrification treatment. The clean water treated in the denitrification deep bed filter assembly 64 is sent to the clean water tank 67, and the wastewater generated by the backwashing of the denitrification deep bed filter assembly 64 is sent to the wastewater tank 65. The device of the embodiment is more efficient in the denitrification treatment process, and the operation cost is also lower.
[0044] In the present application, the devices and assemblies not described in the structure are all commercially available devices or assemblies.
[0045] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.
Claims
1. A pre-aerobic denitrifying deep bed filter apparatus comprising a denitrifying deep bed filter (6), characterized in that, The front oxygen-consuming denitrification deep bed filter device also comprises an oxygen-consuming part; the oxygen-consuming part comprises an oxygen-consuming tank (4), the liquid inlet end of the oxygen-consuming tank (4) is connected with the denitrification water inlet pipeline, and the liquid outlet end is connected with the mixing tank (61) of the denitrification deep bed filter (6) through a pipeline; the oxygen-consuming part also comprises an oxygen-consuming agent storage tank (1), the oxygen-consuming agent storage tank (1) is connected with the oxygen-consuming tank (4) through an oxygen-consuming agent conveying pipeline, and an oxygen-consuming agent dosing pump (2) is arranged on the oxygen-consuming agent conveying pipeline.
2. The pre-deaerated denitrification deep bed filter apparatus according to claim 1, wherein The oxygen-consuming tank (4) is internally provided with a stirrer (3).
3. The pre-deaerated denitrification deep bed filter apparatus according to claim 1, wherein The oxygen-consuming tank (4) is provided with a dissolved oxygen analysis assembly (5).
4. The pre-deaerated denitrification deep bed filter apparatus according to claim 1, wherein The oxygen-consuming agent conveying pipeline is provided with a plurality of oxygen-consuming agent conveying pipelines, and an oxygen-consuming agent dosing pump (2) is arranged on each oxygen-consuming agent conveying pipeline.
5. The predepleted denitrification deep bed filter apparatus according to claim 1, wherein The denitrification deep bed filter (6) comprises a mixing tank (61) and a denitrification deep bed filter assembly (64), the liquid outlet end of the mixing tank (61) is connected with the liquid inlet end of the denitrification deep bed filter assembly (64) through a pipeline; the mixing tank (61) is also connected with a carbon source dosing assembly through a pipeline; the mixing tank (61) is internally provided with a stirrer (3); the clear water and sewage discharge ports of the denitrification deep bed filter assembly (64) are connected with a clear water treatment assembly and a sewage treatment assembly through pipelines respectively.
6. The pre-aeration denitrification deep bed filter apparatus according to claim 5, wherein The carbon source dosing assembly comprises a carbon source storage tank (62), the carbon source storage tank (62) is connected with the mixing tank (61) through a carbon source conveying pipeline, and a carbon source dosing pump (63) is arranged on the carbon source conveying pipeline.
7. The pre-aeration denitrification deep bed filter apparatus according to claim 5, wherein The clear water treatment assembly comprises a clear water tank (67).
8. The pre-aeration denitrification deep bed filter apparatus according to claim 7, wherein The clear water tank (67) is provided with a backwashing pipeline, and a backwashing water pump (68) is arranged on the backwashing pipeline.
9. The pre-aeration denitrification deep bed filter apparatus according to claim 5, wherein The sewage treatment assembly comprises a wastewater tank (65).
10. The pre-aeration denitrification deep bed filter apparatus according to claim 9, wherein The wastewater tank (65) is provided with a drainage pipeline, and a wastewater pump (66) is arranged on the drainage pipeline.