Unpowered low-carbon aerobic denitrification device with low temperature resistance

Abstract

The utility model provides an unpowered low-carbon aerobic denitrification device with low temperature resistance, which structurally comprises an analogous plug flow type low-temperature aerobic denitrification tank, a plurality of partitions are fixedly arranged in the analogous plug flow type low-temperature aerobic denitrification tank, and a microbial carrier is filled in the treatment area; a water distribution layer is fixedly arranged at the top of the unpowered biological denitrification filter tank, a plurality of filter material layers are fixedly arranged on the inner side of the unpowered biological denitrification filter tank, and low-temperature aerobic denitrifying bacteria can be outstanding in denitrification capacity under the condition of high dissolved oxygen at the temperature of 5 DEG C or above. By adopting a biological enrichment method, the concentration of volatile suspended solids in a mixed solution of a biochemical pool can be reduced, the risk of floating sludge is greatly reduced, the sludge discharge load of sludge equipment is reduced, the mycoderm area is huge, and the DO gradient from outside to inside is reduced, so that a raw water carbon source can be fully utilized; the technical problems of filler blockage, high sewage treatment load and incapability of effective denitrification in a low-temperature environment in the existing denitrification technology are solved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of sewage treatment, and in particular to a low-temperature-resistant unpowered low-carbon aerobic denitrification device. Background Art

[0002] Deep nitrogen treatment is the top priority in the transformation of sewage treatment. With the increasingly stringent sewage discharge standards, the emission indicators of total nitrogen are becoming more and more stringent. A lot of research has been carried out on the deep denitrification of sewage treatment at home and abroad.

[0003] The most widely used technology in the field of deep nitrogen removal is sulfur autotrophic denitrification. Autotrophic denitrification refers to the use of inorganic carbon as a carbon source by autotrophic denitrifying bacteria. It mainly uses inorganic matter as an electron donor for nitrate nitrogen reduction to complete microbial metabolism, thereby reducing NO3-N in nitrate nitrogen-contaminated water that lacks an organic carbon source to N2.

[0004] The most obvious advantage of sulfur autotrophic denitrification is that it does not require the addition of carbon sources, which can save treatment costs to a certain extent. However, in actual operation, many influencing factors of sulfur autotrophic denitrification often limit its treatment efficiency.

[0005] The packing material is a one-time investment with high cost, and the biofilm can easily clog the packing material, which reduces the denitrification efficiency and requires frequent backwashing.

[0006] Under high load conditions, a large amount of sulfate ions will inevitably exist in the effluent water, which will release hydrogen sulfide gas in the presence of sulfate-reducing bacteria, which will not only cause corrosion of the drainage pipes, but its stench and toxicity will also bring secondary pollution problems.

[0007] In the autotrophic denitrification process using sulfide as an electron donor, the microorganisms in the system may be inhibited by the toxicity of sulfide, resulting in low treatment efficiency and reduced treatment capacity.

[0008] Low temperature will inhibit the denitrification performance of the denitrifying bacteria system, thereby leading to a decrease in the denitrification rate.

[0009] The inventors proposed a low-temperature-resistant, unpowered, low-carbon, aerobic denitrification device to overcome the technical problems of filler clogging, high sewage treatment load, and inability to effectively denitrify in low-temperature environments in current denitrification technologies. Utility Model Content

[0010] 1. Technical problems solved by the utility model:

[0011] The utility model provides a low-temperature-resistant unpowered low-carbon aerobic denitrification device, which solves the technical problems of filler clogging, high sewage treatment load and inability to effectively denitrify in a low-temperature environment in the existing denitrification technology.

[0012] 2. Technical solution:

[0013] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is: a low-temperature resistant unpowered low-carbon aerobic denitrification device, comprising the following structure:

[0014] The analogy flow type low temperature aerobic denitrification tank has a plurality of partitions built therein, and treatment areas are arranged between adjacent partitions, and the treatment areas are filled with microbial carriers.

[0015] The unpowered biological denitrification filter tank has a water distribution layer fixedly arranged on the top and multiple filter material layers fixedly arranged on the inner side of the unpowered biological denitrification filter tank.

[0016] Furthermore, a water inlet pipe is fixedly provided at the front water inlet end of the analogous flow type low-temperature aerobic denitrification tank, a dosing pipe is fixedly provided at the outer side of the water inlet pipe, and a discharge pipe is fixedly provided at the rear water outlet end of the analogous flow type low-temperature aerobic denitrification tank.

[0017] Furthermore, a plurality of biological carrier barriers are fixedly provided on the surface of the partition, and the inner diameter of the biological carrier barrier is smaller than the size of the microorganism carrier.

[0018] Furthermore, the microbial carrier is loaded with autotrophic nitrifying bacteria and / or heterotrophic nitrifying bacteria and / or low-temperature aerobic denitrifying bacteria and / or heterotrophic bacteria, and the microbial carrier is designed with a high surface area.

[0019] Furthermore, the water inlet end of the water distribution layer is fixedly connected to the water outlet end of the discharge pipe, and a water outlet hole is fixedly provided at the bottom of the water distribution layer, and the water outlet hole faces the filter material layer.

[0020] Furthermore, the outer structure of the filter material layer is designed with a high surface area.

[0021] 3. Beneficial effects:

[0022] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0023] The utility model provides a low-temperature-resistant, unpowered, low-carbon, aerobic denitrification device. Compared with traditional processes, the utility model can greatly save construction land, construction time and construction costs. Low-temperature aerobic denitrification bacteria can have outstanding denitrification capabilities at 5°C or above and under high dissolved oxygen conditions. The biological enrichment method used in the utility model can reduce the concentration of volatile suspended solids in the mixed liquid of the biochemical pool, greatly reduce the risk of floating mud, and reduce the sludge load of the sludge equipment. The huge biofilm area and the DO gradient from outside to inside can make full use of the raw water carbon source. The sewage treatment effect of the equipment is long-lasting, and the utility model can maintain long-term stability for 12 years.

[0024] The utility model provides a low-temperature-resistant unpowered low-carbon aerobic denitrification device. By designing the composition of an analogy flow low-temperature aerobic denitrification tank and an unpowered biological denitrification filter tank, it not only provides macroscopic and microscopic aerobic, anoxic and anaerobic environments, but also solves the DO and carbon source competitions among autotrophic nitrifying bacteria, heterotrophic denitrifying bacteria and heterotrophic bacteria, and can achieve the kinetic balance of the two processes of nitrification and denitrification, realize synchronous nitrification and denitrification, and improve the overall phosphorus removal effect of the system.

[0025] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional diagram of the structure of the utility model;

[0027] Figure 2 It is a half-section stereogram of the structure of the analogy-flow low-temperature aerobic denitrification tank of the utility model;

[0028] Figure 3 It is a half-section stereogram of the structure of the analogy-flow low-temperature aerobic denitrification tank of the utility model;

[0029] Figure 4 It is a half-section stereoscopic diagram of the structure of the unpowered biological denitrification filter tank of the utility model;

[0030] Figure 5 This utility model Figure 4 A magnified view of the structure in the middle.

[0031] Reference numerals:

[0032] Analogy flow type low temperature aerobic denitrification tank-1; water inlet pipe-11; dosing pipe-12; discharge pipe-13;

[0033] Partition-2; Bio-carrier barrier-21;

[0034] Microbial vector-3;

[0035] Unpowered biological denitrification filter-4;

[0036] Water distribution layer-5; water outlet-51;

[0037] Filter layer-6. DETAILED DESCRIPTION

[0038] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0039] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element; when an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a central element; the terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0041] Refer to the attached Figure 1-5 The utility model provides a low-temperature-resistant unpowered low-carbon aerobic denitrification device, comprising the following structure:

[0042] The analogy flow type low temperature aerobic denitrification tank 1 has a plurality of partitions 2 built therein, and a treatment area is provided between adjacent partitions 2, and the treatment area is filled with microbial carriers 3.

[0043] The unpowered biological denitrification filter 4 has a water distribution layer 5 fixedly arranged on the top thereof and a multi-layer filter material layer 6 fixedly arranged on the inner side thereof.

[0044] In this embodiment, Figure 1 and Figure 2 As shown, a water inlet pipe 11 is fixedly provided at the front water inlet end of the analogous flow type low-temperature aerobic denitrification tank 1, a dosing pipe 12 is fixedly provided at the outer side of the water inlet pipe 11, and a discharge pipe 13 is fixedly provided at the rear water outlet end of the analogous flow type low-temperature aerobic denitrification tank 1.

[0045] The sewage to be treated flows into the analogous flow type low temperature aerobic denitrification tank 1 through the water inlet pipe 11 , and the carbon source and phosphorus source are added to the analogous flow type low temperature aerobic denitrification tank 1 through the dosing pipe 12 according to the treatment needs of the sewage.

[0046] In this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, a plurality of biological carrier barriers 21 are fixedly provided on the surface of the partition 2 , and the inner diameter of the biological carrier barrier 21 is smaller than the size of the microorganism carrier 3 .

[0047] The configuration of the biological carrier barrier 21 completes the sewage diversion in multiple treatment areas, ensuring that the microbial carriers 3 carrying different microorganisms are subjected to sewage treatment in the corresponding treatment areas.

[0048] In this embodiment, Figure 3 As shown, the microbial carrier 3 is loaded with autotrophic nitrifying bacteria and / or heterotrophic nitrifying bacteria and / or low-temperature aerobic denitrifying bacteria and / or heterotrophic bacteria, and the microbial carrier 3 is designed with a high surface area.

[0049] The use of low-temperature aerobic denitrification bacteria ensures that the equipment cannot effectively denitrify in a low-temperature environment, reduces the operating pressure of the sewage treatment plant in winter, improves operating stability, and avoids the continuous addition of winter operating costs.

[0050] By utilizing the large specific surface area of ​​biological carriers, the amount of attached nitrification and denitrification bacteria is enhanced, so that the nitrification or denitrification efficiency per unit volume is higher, the hydraulic retention time is shorter, and the treatment effect is better.

[0051] Due to the different dissolved oxygen concentration gradients in the analogy flow low-temperature aerobic denitrification tank 1 and the different specific surface areas of the microbial carriers 3 , aerobic, anaerobic and facultative anaerobic microorganisms will be adsorbed and enriched on the microbial carriers 3 .

[0052] In this embodiment, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the water inlet end of the water distribution layer 5 is fixedly connected to the water outlet end of the discharge pipe 13 , and a water outlet hole 51 is fixedly provided at the bottom of the water distribution layer 5 , and the water outlet hole 51 faces the filter material layer 6 .

[0053] The treated sewage in the analogy flow low-temperature aerobic denitrification tank 1 flows into the water distribution layer 5 by gravity. The water distribution layer 5 cooperates with the water outlet 51 to guide the sewage to the top of the filter material layer 6, so that the filter material layer 6 can treat the sewage.

[0054] In this embodiment, Figure 2 , Figure 4 and Figure 5 As shown, the outer structure of the filter material layer 6 is designed with a high surface area.

[0055] Specific operation process:

[0056] According to the needs of sewage treatment, a carbon source and a phosphorus source addition system can be set at the dosing pipe 12 to provide carbon sources for the subsequent unpowered biological denitrification filter 4 and the anaerobic zone and aerobic zone of the analogous flow low-temperature aerobic denitrification tank 1, thereby enhancing the activity of functional microorganisms in the area, achieving rapid removal of total nitrogen, and improving the total nitrogen removal efficiency.

[0057] The sewage with added carbon source enters into the plug flow low-temperature aerobic denitrification tank 1, and enters into different areas in turn for reproduction through the plug flow process to form a rich bacterial community. Affected by different concentration gradients and biological carrier characteristics, the nitrification and denitrification efficiency per unit volume is higher.

[0058] The water treated in the analogy flow low-temperature aerobic denitrification tank 1 enters the upper layer of the unpowered denitrification filter tank, and enters the water distribution layer 5 under the influence of gravity, which reduces the impact on the lower layer while ensuring uniform water distribution in the entire tank body. After multiple layers of anaerobic, anoxic and aerobic alternating mixed treatment environment, the water quality is deeply purified.

[0059] The design of the analogy flow low-temperature aerobic denitrification tank 1 and the unpowered biological denitrification filter 4 not only provides macroscopic and microscopic aerobic, anoxic and anaerobic environments, but also solves the DO and carbon source competitions among autotrophic nitrifying bacteria, heterotrophic denitrifying bacteria and heterotrophic bacteria, and can achieve the kinetic balance of the two processes of nitrification and denitrification, realize simultaneous nitrification and denitrification, and improve the overall phosphorus removal effect of the system.

[0060] Compared with traditional techniques, the utility model can greatly save construction land, construction time and construction costs.

[0061] Low-temperature aerobic denitrification bacteria have outstanding denitrification capabilities under conditions of 5°C or above and high dissolved oxygen.

[0062] The biological enrichment method adopted in the utility model can reduce the concentration of volatile suspended solids in the mixed liquid of the biochemical pool, greatly reduce the risk of floating mud, and reduce the mud discharge load of the sludge equipment.

[0063] The huge biofilm area and DO gradient from outside to inside can make full use of the carbon source of raw water.

[0064] The sewage treatment effect of this equipment is long-lasting, and the utility model can maintain long-term stability for 12 years.

[0065] The above-described embodiments only express a certain implementation method of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the patent of the utility model shall be based on the attached claims.

Claims

1. A low-temperature resistant unpowered low-carbon aerobic denitrification device, characterized in that: Includes the following structure: An analogous flow type low temperature aerobic denitrification tank (1), wherein a plurality of partitions (2) are fixedly arranged in the analogous flow type low temperature aerobic denitrification tank (1), and a treatment area is arranged between adjacent partitions (2), and the treatment area is filled with a microorganism carrier (3); An unpowered biological denitrification filter (4) is provided with a water distribution layer (5) fixedly disposed on the top of the unpowered biological denitrification filter (4), and a plurality of filter material layers (6) fixedly disposed on the inner side of the unpowered biological denitrification filter (4).

2. The low-temperature-resistant unpowered low-carbon aerobic denitrification device according to claim 1 is characterized in that: A water inlet pipe (11) is fixedly provided at the front water inlet end of the analogous flow type low-temperature aerobic denitrification tank (1), a dosing pipe (12) is fixedly provided on the outside of the water inlet pipe (11), and a discharge pipe (13) is fixedly provided at the rear water outlet end of the analogous flow type low-temperature aerobic denitrification tank (1).

3. The low-temperature resistant unpowered low-carbon aerobic denitrification device according to claim 1 is characterized in that: A plurality of biological carrier barriers (21) are fixedly arranged on the surface of the partition (2), and the inner diameter of the biological carrier barrier (21) is smaller than the size of the microorganism carrier (3).

4. The low-temperature resistant unpowered low-carbon aerobic denitrification device according to claim 1 is characterized in that: The microbial carrier (3) is loaded with autotrophic nitrifying bacteria and / or heterotrophic nitrifying bacteria and / or low-temperature aerobic denitrifying bacteria and / or heterotrophic bacteria, and the microbial carrier (3) is designed with a high surface area.

5. The low-temperature resistant unpowered low-carbon aerobic denitrification device according to claim 1 is characterized in that: The water inlet end of the water distribution layer (5) is fixedly connected to the water outlet end of the discharge pipe (13), and a water outlet hole (51) is fixedly provided at the bottom of the water distribution layer (5), and the water outlet hole (51) faces the filter material layer (6).

6. The low-temperature resistant unpowered low-carbon aerobic denitrification device according to claim 1 is characterized in that: The outer structure of the filter material layer (6) is designed to have a high surface area.

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