Low-temperature sewage denitrification device

Abstract

The invention provides a low-temperature sewage denitrification device, and relates to the technical field of sewage treatment, the low-temperature sewage denitrification device comprises a low-temperature water inlet tank, an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are communicated in sequence, the low-temperature water inlet tank is used for storing low-temperature water, and low-temperature fungicide and hollow phyllostachys pubescens balls are placed in the anaerobic tank, the anoxic tank and the aerobic tank; box bodies of the anaerobic box, the anoxic box and the aerobic box are all provided with sampling ports for sampling sewage; according to the method, the activity of nitrifying bacteria and denitrifying bacteria in mixed liquid under the low-temperature condition is improved by putting the low-temperature fungicide into the anaerobic tank, the anoxic tank and the aerobic tank, and meanwhile, the colonization and growth capacity of cold-resistant flora under the low-temperature condition is improved by adding the phyllostachys pubescens ball carrier; therefore, the denitrification capability of nitrifying bacteria and denitrifying bacteria in a low-temperature environment can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a low-temperature sewage denitrification device. Background Art

[0002] At present, the activated sludge process is one of the most widely used technologies for urban sewage treatment. Most of the microorganisms involved in sewage biological treatment are mesophilic bacteria. However, in some provinces, the average temperature in winter is relatively low, and the temperature drop brings many difficulties and problems to sewage treatment, including the decrease of microbial adsorption capacity, low activity, difficulty in sludge compression and sedimentation, and sludge expansion. These problems lead to the reduction of sewage treatment efficiency and the difficulty of effluent water quality to meet the requirements.

[0003] In the process of sewage denitrification, nitrifying bacteria are more sensitive to low temperatures. They are chemoautotrophic bacteria that use CO2 and CO3 2- Inorganic carbon such as carbon source. The suitable growth temperature of nitrifying bacteria is between 20℃ and 35℃. In a low temperature environment, the metabolic activity of nitrifying bacteria will be inhibited. Denitrifying bacteria are chemoheterotrophic bacteria, and the most suitable growth temperature is 20℃ to 35℃. Low temperature will also inhibit the activity of denitrifying bacteria, but the growth rate of denitrifying bacteria is faster than that of nitrifying bacteria. Therefore, the problem of low denitrification efficiency of sewage under low temperature conditions is mainly found in the nitrification stage.

[0004] Based on the above, how to improve the denitrification efficiency of low-temperature sewage is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] The purpose of the present invention is to provide a low-temperature sewage denitrification device to solve the problems existing in the above-mentioned prior art. By placing low-temperature bacterial agents in anaerobic boxes, anoxic boxes and aerobic boxes, the activity of nitrifying bacteria and denitrifying bacteria in the mixed liquid under low-temperature conditions is improved. At the same time, the colonization and growth ability of cold-resistant bacteria under low-temperature conditions is improved by adding bamboo ball carriers, thereby ensuring the denitrification ability of nitrifying bacteria and denitrifying bacteria in a low-temperature environment.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A low-temperature sewage denitrification device comprises a low-temperature water inlet tank, an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are connected in sequence, wherein the low-temperature water inlet tank is used to store low-temperature water, and low-temperature bacteria agents and hollow bamboo balls are placed in the anaerobic tank, the anoxic tank and the aerobic tank; sampling ports for sewage sampling are arranged on the box bodies of the anaerobic tank, the anoxic tank and the aerobic tank.

[0008] As an implementation manner, the sampling ports on the anaerobic box, the anoxic box, and the aerobic box are each provided with a plurality of sampling ports spaced apart from top to bottom.

[0009] As an implementation manner, a water inlet pump is provided between the low-temperature water inlet tank and the anaerobic box, and a water outlet of the water inlet pump is connected to the bottom of the anaerobic box.

[0010] As an embodiment, it further comprises a nitrification liquid reflux pump, wherein a water inlet and a water outlet of the nitrification liquid reflux pump are respectively connected to the bottom of the aerobic box and the bottom of the anoxic box.

[0011] As an embodiment, it also includes a sludge return pump, the water inlet and the water outlet of the sludge return pump are respectively connected to the bottom of the secondary sedimentation tank and the bottom of the anaerobic box, and the sludge return ratio is 50% to 100%.

[0012] As an implementation mode, the bottom of the secondary sedimentation tank is a conical structure with a diameter gradually decreasing from top to bottom, and the bottom of the conical structure is connected to the water inlet of the sludge return pump.

[0013] As an implementation mode, an aerator is provided at the bottom of the aerobic box, the aerator is connected to an aeration pump, and the dissolved oxygen content of the aerobic box is greater than 2.5 mg / L.

[0014] As an implementation manner, both the anaerobic box and the anoxic box are provided with a stirrer for stirring the sewage.

[0015] As an implementation manner, the residence time ratio of the sewage in the anaerobic box, the anoxic box and the aerobic box is 1:3:8.

[0016] As an embodiment, the system further includes a sewage cooling mechanism for cooling the sewage to a set temperature.

[0017] Compared with the prior art, the present invention has the following technical effects:

[0018] The present invention increases the activity of nitrifying bacteria and denitrifying bacteria in a mixed solution under low temperature conditions by placing low-temperature bacteria agents in an anaerobic box, an anoxic box and an aerobic box, and also increases the colonization and growth ability of cold-resistant bacteria under low temperature conditions by adding bamboo ball carriers, thereby ensuring the denitrification ability of nitrifying bacteria and denitrifying bacteria in a low temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1It is a schematic structural diagram of a low-temperature sewage denitrification device in one embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 1. Low-temperature water inlet tank; 2. Anaerobic tank; 3. Anoxic tank; 4. Aerobic tank; 5. Secondary sedimentation tank; 6. Bamboo ball; 7. Sampling port; 8. Water inlet pump; 9. Nitration liquid return pump; 10. Sludge return pump; 11. Aerator; 12. Aeration pump; 13. Agitator; 14. Outlet pipe; 15. Controller. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The purpose of the present invention is to provide a low-temperature sewage denitrification device to solve the problems existing in the prior art. By placing low-temperature bacterial agents in anaerobic boxes, anoxic boxes and aerobic boxes, the activity of nitrifying bacteria and denitrifying bacteria in the mixed liquid under low-temperature conditions is improved. At the same time, the colonization and growth ability of cold-resistant bacteria under low-temperature conditions is improved by adding bamboo ball carriers, thereby ensuring the denitrification ability of nitrifying bacteria and denitrifying bacteria in a low-temperature environment.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, this embodiment provides a low-temperature sewage denitrification device, including a low-temperature water inlet tank 1, an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4 and a secondary sedimentation tank 5 connected in sequence, the low-temperature water inlet tank 1 is used to store low-temperature water, and low-temperature bacteria agents and hollow bamboo balls 6 are placed in the anaerobic tank 2, the anoxic tank 3 and the aerobic tank 4; the anaerobic tank 2, the anoxic tank 3 and the aerobic tank 4 are provided with a sampling port 7 for sewage sampling. The top of the secondary sedimentation tank 5 is provided with an overflow weir, and an outlet pipe 14 is provided at the overflow weir. During sewage treatment, the low-temperature sewage in the low-temperature water inlet tank 1 passes through the anaerobic tank 2, the anoxic tank 3, and the aerobic tank 4 in sequence for denitrification, and the denitrified water enters the secondary sedimentation tank 5 for mud and water separation, and the upper clear water passes through the overflow weir and is discharged through the outlet pipe 14.

[0027] Bamboo is a widely distributed, low-cost renewable biological resource. The hollow bamboo ball 6 made of bamboo has the advantages of environmental protection and degradability compared to traditional plastic carriers. The inventor found that the bamboo ball 6 not only has a large porosity and specific surface area, but also has a rough texture, which can provide a large amount of attachment area for nitrifying bacteria and denitrifying bacteria, and the rich fiber bundle structure in the bamboo ball 6 is conducive to the attachment and reproduction of microbial communities, thereby improving the formation speed and quality of biofilm. The natural hydrophilicity of bamboo also helps the attachment and growth of microorganisms, promoting the degradation efficiency of pollutants. At the same time, the special structural design of the bamboo ball 6 can effectively avoid the blockage problem and ensure smooth water flow. Compared with other denser carrier materials, the bamboo ball 6 is less likely to form particle deposition during use, which is very important for maintaining the long-term and efficient operation of the bioreactor. Moreover, the bamboo ball 6 has a lighter density, but also has good mechanical strength, can withstand the impact of water flow and is not easily damaged. The lightweight property allows it to have good fluidity in water, convenient to keep suspended and evenly distributed in the system, and ensure the stability and reaction efficiency of the treatment process.

[0028] Therefore, this embodiment increases the activity of nitrifying bacteria and denitrifying bacteria in the mixed solution under low temperature conditions by placing low temperature bacteria agents in the anaerobic box 2, the anoxic box 3 and the aerobic box 4, and also increases the colonization and growth ability of cold-resistant bacteria under low temperature conditions by adding the bamboo ball 6 carrier, thereby ensuring the denitrification ability of nitrifying bacteria and denitrifying bacteria in a low temperature environment. The sampling port 7 on the anaerobic box 2, the anoxic box 3 and the aerobic box 4 is convenient for the staff to sample the sewage and analyze the denitrification of the sewage, so as to verify the denitrification ability of the low-temperature sewage denitrification device in this embodiment, and provide data support for the adjustment of sewage treatment conditions (such as the residence time of sewage in the anaerobic box 2, the anoxic box 3 and the aerobic box 4).

[0029] In this embodiment, the filling rate (volume) of the bamboo balls 6 in each water treatment tank (the anaerobic tank 2, the anoxic tank 3, and the aerobic tank 4) is 20% to 30%, and specifically can be 25%.

[0030] As one embodiment, in order to sample sewage at different positions in the water treatment tank (anaerobic tank 2, anoxic tank 3, aerobic tank 4) and improve the detection accuracy of sewage treatment conditions, in this embodiment, multiple sampling ports 7 are arranged on the anaerobic tank 2, anoxic tank 3 and aerobic tank 4 from top to bottom.

[0031] As an embodiment, a water inlet pump 8 is provided between the low-temperature water inlet tank 1 and the anaerobic tank 2, and the water outlet of the water inlet pump 8 is connected to the bottom of the anaerobic tank 2. The top of the anaerobic tank 2 is connected to the bottom of the anoxic tank 3 through a pipeline, and the top of the anoxic tank 3 is connected to the bottom of the aerobic tank 4 through a pipeline, and a stop valve or a flow regulating valve is correspondingly provided on the connecting pipelines.

[0032] As one implementation mode, the low-temperature sewage denitrification device in this embodiment also includes a nitrification liquid reflux pump 9, and the water inlet and the water outlet of the nitrification liquid reflux pump 9 are respectively connected to the bottom of the aerobic tank 4 and the bottom of the anoxic tank 3, so that the nitrification liquid in the aerobic tank 4 can flow back to the anoxic tank 3.

[0033] As an implementation mode, the low-temperature sewage denitrification device in this embodiment further includes a sludge return pump 10, the water inlet and the water outlet of the sludge return pump 10 are respectively connected to the bottom of the secondary sedimentation tank 5 and the bottom of the anaerobic box 2, and the sludge return ratio is 50% to 100%.

[0034] As an embodiment, the bottom of the secondary sedimentation tank 5 is a tapered structure with a gradually decreasing diameter from top to bottom, and the bottom of the tapered structure is connected to the water inlet of the sludge return pump 10. A vertical pipeline is connected to the bottom of the secondary sedimentation tank 5, and the side wall of the vertical pipeline is connected to the water inlet of the sludge return pump 10 through the pipeline, and a drain valve is provided at the bottom of the output pipeline; during the sewage treatment process and the operation of the sludge return pump 10, the drain valve is closed, and when the drain valve is opened, the sludge remaining in the secondary sedimentation tank 5 can be discharged.

[0035] As one embodiment, an aerator 11 is disposed at the bottom of the aerobic box 4 , and the aerator 11 is connected to an aeration pump 12 . The dissolved oxygen content of the aerobic box 4 is greater than 2.5 mg / L.

[0036] As an embodiment, the anaerobic box 2 and the anoxic box 3 are both provided with a stirrer 13 for stirring the sewage to improve the uniformity of mixing the sewage with nitrifying bacteria and denitrifying bacteria and ensure the denitrification efficiency of the sewage. The stirrer 13 has a speed regulating function.

[0037] As an implementation method, when the low-temperature sewage denitrification device in this embodiment is used for sewage treatment, the total hydraulic retention time (HRT) is 12 hours, and the retention time ratio of the sewage in the anaerobic box 2, the anoxic box 3 and the aerobic box 4 is 1:3:8.

[0038] As an embodiment, a sewage cooling mechanism for cooling sewage to a set temperature is also included. The sewage cooling mechanism is mainly used to simulate or change the sewage temperature during the denitrification effect test of low-temperature sewage. The sewage cooling mechanism may include a coil disposed in the low-temperature water inlet tank 1, and a cooling medium flows through the coil to exchange heat with the sewage to achieve the purpose of cooling the sewage to a set temperature.

[0039] In this embodiment, the low-temperature sewage denitrification device is also provided with a controller 15, which is communicated with the agitator 13, the aeration pump 12, the water inlet pump 8, the nitrification liquid reflux pump 9, the sludge reflux pump 10, the sewage cooling structure and other equipment to facilitate effective control of the entire sewage denitrification process.

[0040] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0041] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A low-temperature sewage denitrification device, characterized in that: It comprises a low-temperature water inlet tank, an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are connected in sequence. The low-temperature water inlet tank is used to store low-temperature water. Low-temperature bacteria agents and hollow bamboo balls are placed in the anaerobic tank, the anoxic tank and the aerobic tank. Sampling ports for sampling sewage are arranged on the box bodies of the anaerobic tank, the anoxic tank and the aerobic tank.

2. The low-temperature sewage denitrification device according to claim 1, characterized in that: The sampling ports on the anaerobic box, the anoxic box and the aerobic box are arranged in plurality from top to bottom.

3. The low-temperature sewage denitrification device according to claim 1, characterized in that: A water inlet pump is arranged between the low-temperature water inlet tank and the anaerobic box, and a water outlet of the water inlet pump is communicated with the bottom of the anaerobic box.

4. The low-temperature sewage denitrification device according to claim 1, characterized in that: It also comprises a nitrification liquid reflux pump, the water inlet and the water outlet of the nitrification liquid reflux pump are respectively connected with the bottom of the aerobic box and the bottom of the anoxic box.

5. The low-temperature sewage denitrification device according to claim 1, characterized in that: It also comprises a sludge return pump, the water inlet and the water outlet of which are respectively connected with the bottom of the secondary sedimentation tank and the bottom of the anaerobic box, and the sludge return ratio is 50% to 100%.

6. The low-temperature sewage denitrification device according to claim 5, characterized in that: The bottom of the secondary sedimentation tank is in a conical structure with a diameter gradually decreasing from top to bottom, and the bottom of the conical structure is connected to the water inlet of the sludge return pump.

7. The low-temperature sewage denitrification device according to claim 1, characterized in that: An aerator is arranged at the bottom of the aerobic box, and the aerator is connected to an aeration pump. The dissolved oxygen content of the aerobic box is greater than 2.5 mg / L.

8. The low-temperature sewage denitrification device according to claim 1, characterized in that: The anaerobic box and the anoxic box are both provided with a stirrer for stirring the sewage.

9. The low-temperature sewage denitrification device according to claim 1, characterized in that: The residence time ratio of the sewage in the anaerobic tank, the anoxic tank and the aerobic tank is 1:3:

8.

10. The low-temperature sewage denitrification device according to claim 1, characterized in that: The utility model also comprises a sewage cooling mechanism for cooling the sewage to a set temperature.

Images