Advanced nitrogen removal device for ferrous sulfide autotrophic denitrification

Abstract

The advanced nitrogen removal device comprises a shell, a water inlet, a water outlet and a filtering assembly, the filtering assembly comprises a ferrous sulfide filler layer, the water inlet is located below the water outlet, a sludge storage area used for storing impurities is arranged on the lower portion of the shell, and the water inlet is located above the sludge storage area. An iron sulfide filler layer is arranged to realize autotrophic denitrification reaction, so that the sewage treatment cost and the maintenance cost are reduced. The water inlet is arranged below the water outlet, so that sewage can be in full contact with the ferrous sulfide filler layer, the reaction effect is improved, deep denitrification of the sewage is realized, water flows from the lower part to the upper part, impurities can be blocked below the filtering assembly, and the impurities fall into the sludge storage area under the action of gravity, so that the impurities are prevented from being attached to the ferrous sulfide filler layer; the reaction effect is ensured. Meanwhile, the water inlet is positioned above the sludge storage area, so that sludge and other impurities are prevented from being muddy during water feeding, the reaction effect is ensured, and the sewage treatment effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and more specifically to a deep denitrification device for ferrous sulfide autotrophic denitrification. Background Art

[0002] With the acceleration of urbanization, the discharge of urban domestic sewage continues to grow, leading to increasingly serious water pollution problems. Among them, nitrogen, as one of the main pollutants, its excessive discharge not only reduces the availability of water resources, but also causes environmental problems such as ecosystem imbalance and eutrophication. Given the common low carbon-nitrogen ratio characteristics of urban domestic sewage, traditional urban sewage denitrification processes mainly rely on the "aerobic nitrification-anoxic denitrification" process. When treating low-carbon-nitrogen ratio sewage, this process is limited by insufficient carbon sources, resulting in low total nitrogen removal efficiency. The additional addition of organic carbon sources and alkalinity materials complicates the treatment process, and the required material usage and maintenance costs are relatively high. The addition of organic carbon sources and alkalinity may also introduce the risk of secondary pollution, affecting the sewage treatment effect. At the same time, during the sewage treatment process, sludge easily accumulates in the device, affecting the circulation of sewage and the reaction between sewage and materials, resulting in poor denitrification effect. Utility Model Content

[0003] In order to overcome the defects of the traditional denitrification process in the above-mentioned prior art, such as the high material use cost and maintenance cost, and the influence of sludge accumulation on the denitrification effect, the utility model provides a deep denitrification device of sulfide-iron autotrophic denitrification, which reduces the use cost and maintenance cost required for the treatment process, reduces the influence of sludge on sewage treatment, and improves the denitrification effect of sewage.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a deep denitrification device for sulfide iron autotrophic denitrification, comprising: a shell, a water inlet and a water outlet respectively connected to the shell, and a filter component arranged in the shell, the filter component comprising a sulfide iron filler layer, water flows into the water inlet, passes through the sulfide iron filler layer, and then flows out from the water outlet, the water inlet is located below the water outlet, and a mud storage area for storing impurities is provided at the lower part of the shell, and the water inlet is located above the mud storage area.

[0005] In recent years, biological denitrification technology has attracted wide attention due to its advantages of waste treatment, less secondary pollution and low sludge production. 2+ 、S 0 、S 2- , H2, etc.) as electron donors, achieving the goal of NO3 -The reduction and removal of -N provides a new idea for the deep denitrification of urban domestic sewage. In this scheme, the sulfide material in the sulfide filler layer is used as an electron donor to realize the autotrophic denitrification reaction and realize the removal of NO3 - -N is efficiently reduced and removed without the need for additional materials, reducing usage and maintenance costs. The water inlet is set below the water outlet so that the water can flow from the bottom of the filter component to the top, ensuring that the sewage is in full contact with the filter component to achieve deep denitrification. It can also block most of the silt and other impurities below the filter component. Specifically, one or more groups of filter components are provided in the shell. The filter component at the bottom will block most of the silt and other impurities. The silt and other impurities will fall into the mud storage area under the action of gravity, avoiding excessive silt accumulation on the filter component, ensuring the reaction effect of filtration and sewage, and ensuring the denitrification effect. At the same time, the water inlet should be higher than the mud storage area. When water is entering, it can prevent the water flow from muddying the silt and other impurities in the mud storage area. Among them, the sulfide filler layer includes sulfide particles or sulfide blocks containing sulfide inorganic substances.

[0006] Preferably, the filter assembly further comprises an alkaline filter material layer connected to the ferrous sulfide filler layer, and the alkaline filter material layer is used to neutralize acidic substances generated in sewage treatment.

[0007] pH is a key factor influencing the denitrification process. The optimal pH range for denitrifying bacteria is 7.0-8.0, achieving the highest denitrification rate. Outside this pH range, the denitrification rate decreases significantly. Acidic substances are produced during the reaction, so an alkaline filter layer is added to achieve acid-base neutralization and enhance the filter assembly's ability to filter impurities.

[0008] Preferably, the alkaline filter material layer comprises alkaline stone.

[0009] Alkaline stone has a low cost, is conducive to the attachment of denitrifying bacteria, and can also improve the filtration effect. Specifically, marble, alkaline granite or diorite can be selected.

[0010] Preferably, the filter assembly also includes a filter tray for arranging the ferrous sulfide filler layer and the alkaline filter material layer. The filter tray is provided with at least three layers for placing filter materials. The ferrous sulfide filler layer is located in the middle layer of the filter tray, and the upper and lower layers of the ferrous sulfide filler layer are both the alkaline filter material layers.

[0011] The filter tray is used to set up a ferrous sulfide filler layer and an alkaline filter material layer. The alkaline filter material layer is placed above and below the ferrous sulfide filler layer to increase the filtration effect on impurities, prevent impurities from covering the ferrous sulfide filler layer and affecting the contact between the sewage and the ferrous sulfide filler layer, and enable the sewage to better react with the alkaline filter material layer. During the reaction, acidic substances are generated in the ferrous sulfide filler layer, and the alkaline filter material layer can also better play the role of neutralizing the acidic substances. Specifically, the filter tray includes a frame and a filter screen. Multiple filter screens are installed on the frame for layered operation. Water flows into the filter screen and passes through the alkaline filter material layer and the ferrous sulfide filler layer.

[0012] Preferably, it further includes an exhaust hole arranged on the top of the shell.

[0013] Gas will be generated during the denitrification reaction. An exhaust hole is set to discharge the gas. The exhaust hole can be set to normally open, or a valve can be installed and opened periodically to exhaust the gas.

[0014] Preferably, a plurality of the filter components are provided in the housing, and the spacing distances between adjacent filter components are not unique.

[0015] Multiple filter assemblies are provided to enhance filtration and reaction efficiency. The spacing between adjacent filter assemblies is not limited to the spacing between each filter assembly and can be set based on actual hydraulic conditions to maximize the denitrification efficiency of the device. For example, the spacing between adjacent filter assemblies located below can be smaller than the spacing between adjacent filter assemblies located above.

[0016] Preferably, the shell is connected to a plurality of the water inlets, and the water flow of each water inlet can be controlled individually.

[0017] Multiple water inlets are provided, and each can be adjusted to start, stop, and operate at a specific frequency, improving control of water input. This allows for overall treatment efficiency to be controlled based on the sewage treatment effect. This facilitates adjustment of sewage delivery volume and speed, aligning sewage delivery with the denitrification efficiency of the device and ensuring effective sewage treatment. Furthermore, the water inlets are evenly spaced along the circumference of the shell.

[0018] Preferably, the shell is connected to a plurality of the water outlets.

[0019] Multiple water outlets are provided to ensure smooth water flow. The device adopts gravity water outlet, that is, the water inlet is provided with a conveying power, and the water outlet is not provided. Furthermore, the water outlets are evenly distributed along the circumference of the shell.

[0020] Preferably, the shell of the mud storage area is in an inverted cone shape.

[0021] The mud storage area is designed to be in an inverted cone shape, which is conducive to the accumulation and aggregation of silt and other impurities, and also facilitates the discharge of impurities.

[0022] Preferably, it further comprises a sewage outlet provided at the bottom of the shell and a sewage valve installed on the sewage outlet, and the sewage outlet is communicated with the mud storage area.

[0023] A sewage outlet is set up to facilitate the discharge of impurities, and the sewage valve can be a manual valve or an electronically controlled valve.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] A sulfide iron filler layer is installed to achieve autotrophic denitrification, reducing sewage treatment and maintenance costs. The water inlet is set below the outlet so that the sewage can fully contact the sulfide iron filler layer, improving the reaction effect and achieving deep denitrification of the sewage. At the same time, the water flows from bottom to top, which can block impurities under the filter component. Impurities will also fall into the mud storage area under the action of gravity, preventing impurities from adhering to the sulfide iron filler layer and ensuring the reaction effect. At the same time, the water inlet is located above the mud storage area to prevent impurities such as silt from being stirred up when the water enters, ensuring the reaction effect and improving the sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of an implementation structure of a deep denitrification device for ferrous sulfide autotrophic denitrification according to the present invention;

[0027] Figure 2 This is a schematic diagram of another embodiment of the structure of a deep denitrification device for ferrosulfur autotrophic denitrification of the present invention;

[0028] Figure 3 The utility model is a schematic structural diagram of a filter component of a deep denitrification device for ferrosulphur autotrophic denitrification.

[0029] In the figure: 1. Shell; 101. Mud storage area; 2. Water inlet; 3. Water outlet; 4. Filter assembly; 401. Sulfur iron filler layer; 402. Alkaline filter material layer; 403. Filter material disc; 5. Exhaust hole; 6. Sewage outlet; 7. Sewage valve. DETAILED DESCRIPTION

[0030] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0033] Example 1

[0034] like Figure 1 As shown, a deep denitrification device for sulfide autotrophic denitrification includes: a shell 1, a water inlet 2 and a water outlet 3 respectively connected to the shell 1, and a filter component 4 arranged in the shell 1. The filter component 4 includes a sulfide iron filler layer 401. Water flows into the shell from the water inlet 2, passes through the sulfide iron filler layer 401, and then flows out from the water outlet 3. The water inlet 2 is located below the water outlet 3. A mud storage area 101 for storing impurities is provided at the lower part of the shell 1, and the water inlet 2 is located above the mud storage area 101.

[0035] In recent years, biological denitrification technology has attracted widespread attention due to its advantages, including waste treatment, minimal secondary pollution, and low sludge production. Among them, autotrophic denitrification technology uses inorganic compounds (such as Fe, Fe2+, SO, S2-, H2, etc.) as electron donors to achieve the reduction and removal of NO3--N in wastewater, providing a new approach to deep denitrification of municipal wastewater. In this solution, the ferrous sulfide in the ferrous sulfide filler layer 401 is used as an electron donor to achieve an autotrophic denitrification reaction, achieving efficient reduction and removal of NO3--N in wastewater without the need for additional material additions, reducing operational and maintenance costs. The water inlet 2 is set below the water outlet 3 so that the water can flow from the bottom of the filter assembly 4 to the top, ensuring that the sewage is in full contact with the filter assembly 4, achieving deep denitrification, and blocking most of the silt and other impurities below the filter assembly 4. Specifically, one or more groups of filter assemblies 4 are provided in the shell 1. The filter assembly 4 at the bottom will block most of the silt and other impurities, which will fall into the mud storage area 101 under the action of gravity, avoiding excessive silt accumulation on the filter assembly 4, ensuring the reaction effect of filtration and sewage, and ensuring the denitrification effect. At the same time, the water inlet 2 should be higher than the mud storage area 101. When water is inlet, it can prevent the water flow from muddying the silt and other impurities in the mud storage area 101. Among them, the sulfide filler layer 401 includes sulfide particles or sulfide blocks containing sulfide inorganic substances.

[0036] The beneficial effects of this embodiment are as follows: a sulfide iron filler layer 401 is provided to realize an autotrophic denitrification reaction, thereby reducing sewage treatment costs and maintenance costs. The water inlet 2 is provided below the water outlet 3 so that the sewage can fully contact the sulfide iron filler layer 401, thereby improving the reaction effect and achieving deep denitrification of the sewage. At the same time, the water flows from the bottom to the top, which can block impurities below the filter component 4. The impurities will also fall into the mud storage area 101 under the action of gravity, thereby preventing impurities from adhering to the sulfide iron filler layer 401 and ensuring the reaction effect. At the same time, the water inlet 2 is located above the mud storage area 101 to avoid muddying impurities such as silt when the water enters, thereby ensuring the reaction effect and improving the sewage treatment effect.

[0037] Example 2

[0038] like Figure 1 and Figure 3 As shown, based on Example 1, the difference from Example 1 is:

[0039] The filter assembly 4 also includes an alkaline filter material layer 402 connected to the sulfide filler layer 401. The alkaline filter material layer 402 is used to neutralize acidic substances generated during sewage treatment. The alkaline filter material layer 402 includes alkaline stone. The filter assembly 4 also includes a filter material disc 403 for arranging the sulfide filler layer 401 and the alkaline filter material layer 402. The filter material disc 403 is provided with at least three layers for placing filter materials. The sulfide filler layer 401 is located in the middle layer of the filter material disc 403, and the upper and lower layers of the sulfide filler layer 401 are both alkaline filter material layers 402. It also includes an exhaust hole 5 arranged at the top of the shell 1. A plurality of filter assemblies 4 are arranged in the shell 1, and the spacing distance between adjacent filter assemblies 4 is not unique.

[0040] pH is a key factor influencing the denitrification process. The optimal pH range for denitrifying bacteria is 7.0-8.0, at which point the denitrification rate is highest. Outside this pH range, the denitrification rate decreases significantly. Acidic substances are produced during the reaction, so the alkaline filter layer 402 is provided to achieve acid-base neutralization and enhance the filter assembly 4's ability to filter impurities. Alkaline stone is relatively inexpensive, facilitates the attachment of denitrifying bacteria, and improves filtration efficiency. Specific examples include marble, alkaline granite, or diorite. The filter disc 403 is used to set the sulfide filler layer 401 and the alkaline filter layer 402. The alkaline filter layer 402 is set above and below the sulfide filler layer 401 to increase the filtering effect on impurities, avoid impurities covering the sulfide filler layer 401, and affect the contact between the sewage and the sulfide filler layer 401, so that the sewage can better react with the alkaline filter layer 402. During the reaction, acidic substances are produced at the sulfide filler layer 401, and the alkaline filter layer 402 can also better play the role of neutralizing acidic substances. Specifically, the filter disc 403 includes a frame and a filter screen. Multiple filter screens are installed on the frame for layering. Water flows in from the filter screen and passes through the alkaline filter layer 402 and the sulfide filler layer 401. Gas will be generated during the denitrification reaction. An exhaust hole 5 is set to discharge the gas. The exhaust hole 5 can be set to a normally open type, or a valve can be installed and opened periodically for exhaust. Multiple filter components 4 are provided to improve the filtering and reaction effects. The spacing between adjacent filter assemblies 4 does not necessarily refer to the spacing between each filter assembly 4. It can be set according to actual hydraulic conditions to maximize the denitrification effect of the lifting device. For example, the spacing between adjacent filter assemblies 4 located below is smaller than the spacing between adjacent filter assemblies 4 located above.

[0041] In this embodiment, the filter material disc 403 has three layers, the upper and lower layers are both alkaline filter material layers 402, and the middle layer is the sulfide iron filler layer 401.

[0042] Furthermore, in this embodiment, the shell 1 is cylindrical as a whole, the filter disc 403 is circular, and the ratio of the height of the shell 1 excluding the mud storage area 101 to the diameter of the filter disc 403 is 3.5:1. Four groups of filter components 4 are arranged in the shell 1 to fully ensure the filtering and reaction effects.

[0043] The remaining features and working principles of this embodiment are consistent with those of embodiment 1.

[0044] Example 3

[0045] like Figure 2 As shown, based on Example 1 or Example 2, Example 1 or Example 2 is further limited, and the difference is that:

[0046] The housing 1 is connected to multiple water inlets 2, each of which has independently controllable water flow. The housing 1 is also connected to multiple water outlets 3. The portion of the housing 1 in the mud storage area 101 is inverted conical in shape. It also includes a drain outlet 6 at the bottom of the housing 1 and a drain valve 7 mounted on the drain outlet 6. The drain outlet 6 communicates with the mud storage area 101.

[0047] A plurality of water inlets 2 are provided, and each water inlet 2 can be started, stopped and adjusted in frequency to improve the control of the input of flowing water, so as to control the overall treatment efficiency according to the sewage treatment effect, that is, to facilitate the adjustment of the sewage delivery volume and delivery speed, so that the sewage delivery matches the denitrification reaction efficiency of the device, and ensure the sewage treatment effect. Furthermore, the water inlet 2 is evenly arranged along the circumference of the shell 1. A plurality of water outlets 3 are provided to ensure smooth water outflow. The device adopts gravity water discharge, that is, a delivery power is provided at the water inlet 2, and the water outlet 3 is not provided. Furthermore, the water outlet 3 is evenly arranged along the circumference of the shell 1. The sludge storage area 101 is set to an inverted cone shape, which is conducive to the accumulation and aggregation of impurities such as silt, and is also conducive to the discharge of impurities. The sewage outlet 6 is provided to facilitate the discharge of impurities, and the sewage valve 7 can be a manual valve or an electrically controlled valve.

[0048] The rest of the working principle and working process of this embodiment are consistent with those of embodiment 1 or embodiment 2.

[0049] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A deep denitrification device for ferrosulphur autotrophic denitrification, characterized in that: include: A shell (1), a water inlet (2) and a water outlet (3) respectively connected to the shell (1), and a filter assembly (4) arranged in the shell (1), wherein the filter assembly (4) comprises a sulfide iron filler layer (401), water flows into the water inlet (2), flows through the sulfide iron filler layer (401), and then flows out from the water outlet (3), the water inlet (2) is located below the water outlet (3), a mud storage area (101) for storing impurities is provided at the lower part of the shell (1), the water inlet (2) is located above the mud storage area (101), the filter assembly (4) further comprises an alkaline filter material layer (402) connected to the sulfide iron filler layer (401), and a filter assembly (402) for arranging the sulfide iron filler layer (401) and the alkaline filter material layer (402). ) of the filter material disc (403), the alkaline filter material layer (402) is used to neutralize acidic substances generated in sewage treatment, the filter material disc (403) includes a frame and a filter screen, a plurality of the filter screens are installed on the frame for layering and at least three layers are provided, the sulfide iron filler layer (401) is located in the middle layer of the filter material disc (403), the upper and lower layers of the sulfide iron filler layer (401) are both the alkaline filter material layer (402), a plurality of the filter components (4) are provided in the housing (1), the spacing distance between adjacent filter components (4) is not unique, the housing (1) is connected to a plurality of the water inlets (2), the water flow of each water inlet (2) can be individually controlled, and the housing (1) is connected to a plurality of the water outlets (3).

2. The deep denitrification device of a ferrous sulfide autotrophic denitrification according to claim 1, characterized in that: The alkaline filter material layer (402) comprises alkaline stone.

3. The deep denitrification device of a ferrous sulfide autotrophic denitrification according to claim 1, characterized in that: It also includes an exhaust hole (5) arranged on the top of the shell (1).

4. The deep denitrification device of a ferrous sulfide autotrophic denitrification according to claim 1, characterized in that: The shell (1) of the mud storage area (101) is in an inverted cone shape.

5. A deep denitrification device for ferrous sulfide autotrophic denitrification according to any one of claims 1 to 4, characterized in that: It also includes a sewage outlet (6) provided at the bottom of the housing (1) and a sewage valve (7) installed on the sewage outlet (6), and the sewage outlet (6) is communicated with the mud storage area (101).

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