Pilot test device for removing high-concentration total nitrogen

Abstract

The utility model relates to a pilot plant test device for removing high-concentration total nitrogen. The pilot plant test device comprises a base, an autotrophic denitrification tank, a reclaimed water tank and a clear water tank, a liquid inlet and a backwashing gas inlet are formed in the lower end of the side wall of the autotrophic denitrification tank, a liquid outlet is formed in the upper end of the side wall of the autotrophic denitrification tank, and a water and gas distribution system, a pebble supporting layer and sulfur autotrophic filler are sequentially arranged in the autotrophic denitrification tank from bottom to top; the liquid inlet is connected with a main liquid inlet pipe, the main liquid inlet pipe is connected with the reclaimed water tank through a liquid inlet pipeline and a liquid inlet pump, the liquid inlet pipeline is connected with the clear water tank through a reflux pipeline and a reflux pump, and the clear water tank is connected with the main liquid inlet pipe through a backwashing pipeline and a backwashing pump; the backwashing air inlet is connected with a backwashing fan through a backwashing air inlet pipeline; the liquid outlet is connected with the clear water tank through a liquid outlet pipeline, and the liquid outlet pipeline is connected with the reclaimed water tank through a blow-off pipeline. The sewage treatment device is simple and easy to operate, reliable in performance and good in sewage treatment effect.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen waste leachate treatment, in particular to a pilot test device for removing high-concentration total nitrogen. Background Art

[0002] At present, the leachate wastewater from restaurant kitchen waste has a high ammonia nitrogen content and needs to be treated. The current traditional method is to strengthen the biochemical reaction, including increasing the pool volume to increase the sludge concentration, supplementing the carbon source to strengthen the denitrification, and changing the biochemical process, such as: multi-stage AO process, etc. However, the above measures often increase the construction cost or operation cost a lot, and the above process is difficult to ensure the continuous degradation of total nitrogen. How to adopt a process equipment with low construction cost and avoid carbon source consumption in the later operation is a huge challenge facing the current environmental protection industry. Utility Model Content

[0003] The utility model aims to solve the deficiencies of the prior art and provides a pilot test device for removing high-concentration total nitrogen.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A pilot test device for removing high-concentration total nitrogen comprises a base, on which an autotrophic denitrification tank, a medium water tank and a clean water tank are installed;

[0006] The autotrophic denitrification tank comprises a first tank body, a second tank body, a third tank body and a fourth tank body which are sequentially installed from bottom to top, a liquid inlet and a backwash air inlet are arranged on the side wall of the first tank body, a liquid outlet is arranged on the side wall of the fourth tank body, a first filter material baffle is arranged between the first tank body and the second tank body, a plurality of water distribution filter heads are installed on the first filter material baffle, a second filter material baffle is arranged between the second tank body and the third tank body, a third filter material baffle is arranged between the third tank body and the fourth tank body, a pebble supporting layer is arranged between the first filter material baffle and the second filter material baffle, and a sulfur autotrophic filler is arranged between the second filter material baffle and the third filter material baffle;

[0007] The liquid inlet is connected to a main liquid inlet pipe, which is connected to the medium water tank through a liquid inlet pipe and a liquid inlet pump, and the liquid inlet pipe is connected to a reflux pipe through a tee, and the reflux pipe is connected to the clean water tank through a reflux pump, and the clean water tank is connected to the main liquid inlet pipe through a backwash pipe and a backwash pump;

[0008] The backwash air inlet is connected to a backwash fan through a backwash air inlet pipe, and the backwash fan is fixed on the base;

[0009] The liquid outlet is connected to the clean water tank through a liquid outlet pipe, and the liquid outlet pipe is connected to the medium water tank through a sewage pipe.

[0010] An ultrasonic level meter is installed in the grey water tank.

[0011] The liquid inlet pipeline is provided with a liquid inlet double union ball valve and a first flow meter from bottom to top, and the tee is located between the liquid inlet double union ball valve and the first flow meter; the reflux double union ball valve is installed on the reflux pipeline; the backwash pipeline is provided with a backwash double union ball valve and a second flow meter from bottom to top.

[0012] An air inlet double-union ball valve, a gas flow meter and a check valve are arranged in sequence on the backwash air inlet pipeline from the backwash fan to the backwash air inlet.

[0013] A liquid outlet double-union ball valve is provided on the liquid outlet pipeline close to the clean water tank, and a sewage discharge double-union ball valve is provided on the sewage discharge pipeline.

[0014] An external discharge port is arranged at the upper end of the side wall of the clean water tank, and an external discharge valve is arranged on the external discharge port.

[0015] The beneficial effects of the utility model are as follows: the utility model avoids the disadvantage of carbon source consumption in traditional heterotrophic filter tanks, is easy to operate, has reliable performance, and has good sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the autotrophic denitrification tank in the utility model;

[0018] Figure 3 for Figure 2 Cross-section of the middle AA;

[0019] In the figure: 1-base; 2-autotrophic denitrification tank; 3-recycled water tank; 4-clean water tank; 5-main liquid inlet pipe; 6-liquid inlet pipeline; 7-liquid inlet pump; 8-tee fitting; 9-reflux pipeline; 10-reflux pump; 11-backwash pipeline; 12-backwash pump; 13-backwash air inlet pipeline; 14-backwash fan; 15-liquid outlet pipeline; 16-sewage pipeline; 17-stirring motor; 18-liquid inlet double union ball valve; 19-first flow meter; 20-reflux double union ball valve; 21-backwash double union ball valve; 22-second flow meter; 23-inlet double union ball valve; 24-gas flow meter; 25-check valve; 26-liquid outlet double union ball valve; 27-sewage double union ball valve; 28-external outlet; 29-external valve; 30-bracket;

[0020] 201-first tank body; 202-second tank body; 203-third tank body; 204-fourth tank body; 205-liquid inlet; 206-backwash air inlet; 207-liquid outlet; 208-first filter baffle; 209-water filter head; 2010-second filter baffle; 2011-third filter baffle; 2012-pebble support layer; 2013-sulfur autotrophic filler;

[0021] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0023] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein 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.

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0026] A pilot test device for removing high concentrations of total nitrogen, such as Figure 1 As shown, it includes a base 1, an autotrophic denitrification tank 2, a reclaimed water tank 3, a clean water tank 4, a main liquid inlet pipe 5, a liquid inlet pipeline 6, a liquid inlet pump 7, a tee 8, a reflux pipeline 9, a reflux pump 10, a backwash pipeline 11, a backwash pump 12, a backwash air inlet pipeline 13, a backwash fan 14, a liquid outlet pipeline 15, a sewage pipeline 16, a stirring motor 17, a liquid inlet double-union ball valve 18, a first flow meter 19, a reflux double-union ball valve 20, a backwash double-union ball valve 21, a second flow meter 22, an air inlet double-union ball valve 23, a gas flow meter 24, a check valve 25, a liquid outlet double-union ball valve 26, a sewage discharge double-union ball valve 27, an external discharge port 28, an external discharge valve 29 and a bracket 30.

[0027] The autotrophic denitrification tank 2 , the intermediate water tank 3 and the clean water tank 4 are installed on the base 1 .

[0028] Autotrophic denitrification tank 2 Figure 2 , Figure 3 As shown, it includes a first tank body 201, a second tank body 202, a third tank body 203 and a fourth tank body 204 which are installed in sequence from bottom to top, a liquid inlet 205 and a backwash air inlet 206 are provided on the side wall of the first tank body 201, a liquid outlet 207 is provided on the side wall of the fourth tank body 204, a first filter material baffle 208 is provided between the first tank body 201 and the second tank body 202, a plurality of water distribution filter heads 209 are installed on the first filter material baffle 208, a second filter material baffle 2010 is provided between the second tank body 202 and the third tank body 203, a third filter material baffle 2011 is provided between the third tank body 203 and the fourth tank body 204, a pebble supporting layer 2012 is provided between the first filter material baffle 208 and the second filter material baffle 2010, and a sulfur autotrophic filler 2013 is provided between the second filter material baffle 2010 and the third filter material baffle 2011.

[0029] The water distribution filter head 209 may also be replaced by a T-type filter brick.

[0030] The first tank body 201 is fixed on the base 1 through a flange, and the first tank body 201 and the second tank body 202, the second tank body 202 and the third tank body 203, and the third tank body 203 and the fourth tank body 204 are all fixedly connected through flanges.

[0031] The liquid inlet 205 is connected to the main liquid inlet pipe 5, the main liquid inlet pipe 5 is connected to the medium water tank 3 through the liquid inlet pipe 6 and the liquid inlet pump 7, the liquid inlet pipe 6 is connected to the reflux pipe 9 through the tee 8, the reflux pipe 9 is connected to the clean water tank 4 through the reflux pump 10, the clean water tank 4 is connected to the main liquid inlet pipe 5 through the backwash pipe 11 and the backwash pump 12, the liquid inlet pipe 6 is provided with a liquid inlet double union ball valve 18 and a first flow meter 19 from bottom to top, the tee 8 is located between the liquid inlet double union ball valve 18 and the first flow meter 19; the reflux double union ball valve 20 is installed on the reflux pipe 8; the backwash pipe 11 is provided with a backwash double union ball valve 21 and a second flow meter 22 from bottom to top.

[0032] The backwash air inlet 206 is connected to the backwash fan 14 through the backwash air inlet pipe 13. The backwash fan 14 is fixed on the base 1. The backwash air inlet pipe 13 is provided with an air inlet double-union ball valve 23, a gas flow meter 24 and a check valve 25 in sequence from the backwash fan 14 to the backwash air inlet 206.

[0033] The liquid outlet 207 is connected to the clean water tank 4 through the liquid outlet pipe 15, and the liquid outlet pipe 15 is connected to the medium water tank 3 through the sewage pipe 16. A liquid outlet double-union ball valve 26 is provided on the liquid outlet pipe 15 near the clean water tank 4, and a sewage discharge double-union ball valve 27 is provided on the sewage pipe 16.

[0034] A stirring shaft is arranged in the middle water tank 3 , a stirring blade is arranged on the stirring shaft, a stirring motor 17 is connected to the top of the stirring shaft, and an ultrasonic level meter is arranged in the middle water tank 3 .

[0035] An external discharge port 28 is provided at the upper end of the side wall of the clean water tank 4 , and an external discharge valve 29 is provided on the external discharge port 28 .

[0036] A bracket 30 is provided on the base 1 at the periphery of the medium water tank 3 and the clean water tank 4 , and the liquid inlet pump 7 , the reflux pump 10 and the backwash pump 12 are all fixed on the bracket 30 .

[0037] The materials of each part of the utility model are all made of carbon steel anti-corrosion materials. When the liquid level of the intermediate water tank 3 is high, the liquid inlet pump 7 lifts the inlet water into the bottom of the autotrophic denitrification tank 2, and enters the autotrophic denitrification tank 2 through the air-water distribution system, that is, the water filter head 209. After the sewage enters the interior, the reverse flow passes through the pebble support layer 2012 and the sulfur autotrophic filler 2013 from bottom to top, and the SS part of the sewage is intercepted. The total nitrogen is consumed and removed by the autotrophic denitrification bacteria attached to the sulfur autotrophic filler 2013, and finally discharged into the clean water tank 4 for temporary storage. Nitrate nitrogen is used by autotrophic denitrifying bacteria to produce nitrogen gas, which is discharged from the system. After a period of operation, the filter layer may be blocked or gas blocked. After a certain period of filtration, the suspended solids in the effluent increase, and the liquid level of the autotrophic denitrification tank 2 continues to be high, indicating that the filter material is blocked and needs to be backwashed. The backwash pump 12 and the backwash fan 14 are used for water washing and air washing respectively. The nitrogen-discharging water washing process needs to be carried out regularly to prevent the generated nitrogen gas from blocking the filter. The wastewater after backwashing is treated again through the sewage pipe 16 and the reclaimed water tank 3 or discharged into the designated ditch through the wastewater collection pipe.

[0038] When the liquid level of autotrophic denitrification tank 2 reaches the set level, the system will determine the interval time according to its own program, so as to determine whether the reason for the high liquid level of autotrophic denitrification tank 2 is gas blockage or blockage. If it is gas blockage, water backwashing will be performed separately. If it is blockage, air washing, steam-water washing, water washing and flushing will be performed separately. The time is set separately according to the process requirements.

[0039] When debugging the system, the control procedure is as follows:

[0040] Normal filtration: Set the starting liquid level of the water tank 3 to 1.5m (adjustable) and the stopping liquid level to 0.5m (adjustable). When the ultrasonic level meter is at the starting liquid level, open the inlet double-union ball valve 18 and the outlet double-union ball valve 26, and keep the other valves closed. Start the inlet pump 7 for normal filtration.

[0041] Nitrogen expulsion process: Set the nitrogen expulsion liquid level to 2.75m (adjustable, changeable during the debugging stage). When the liquid level of the autotrophic denitrification tank 2 meets the above level, start the nitrogen expulsion process. When the nitrogen expulsion process is running, close the liquid outlet double union ball valve 26, open the sewage double union ball valve 27 and the liquid inlet double union ball valve 18, open the backwash double union ball valve 21, start the backwash pump 12, and run according to the nitrogen expulsion state (separate water washing). When this liquid level is met again, the system has a built-in nitrogen expulsion time interval of 6 hours (during the debugging stage, observe the shortest time from the liquid level to the nitrogen expulsion setting level, and set it as the nitrogen expulsion liquid level), which can be adjusted. When the interval time to meet this level again is ≥ the built-in nitrogen expulsion interval time, the system defaults to no blockage, and the reason for the liquid level increase is gas blockage, which needs to be adjusted. Perform nitrogen expulsion process; when the interval time of the liquid level is again met < the built-in nitrogen expulsion interval time, the system defaults to blockage, and the reason for the increase in liquid level is suspended matter blockage, and a backwash process is required. During the backwash operation process, in the first stage, the liquid outlet double-union ball valve 26 is closed, the liquid inlet double-union ball valve 18 is closed, the air inlet double-union ball valve 23 is opened, the backwash fan 14 is started, and the operation is 5 minutes (adjustable); in the second stage, the sewage discharge double-union ball valve 27 is opened, the backwash double-union ball valve 21 is opened, the backwash pump 12 is started, and it is jointly operated with the backwash fan 14 for 10 minutes (adjustable); in the third stage, the backwash fan 14 is closed, the air inlet double-union ball valve 23 is closed, and water washing is performed alone for 5 minutes (adjustable), and finally the entire backwash process is completed.

[0042] Backwashing process: When the number of nitrogen expulsions from the filter reaches the set value of 8 times (adjustable), a backwashing (air washing, steam-water washing, water washing) must be forced.

[0043] The utility model avoids the disadvantage of traditional heterotrophic filter tanks that consume carbon sources. The device integrates sewage treatment technology and automatic control, can be unattended, is simple and easy to operate, has reliable performance, and has good sewage treatment effect. It has a good use effect in the total nitrogen degradation treatment of kitchen waste leachate.

[0044] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A pilot test device for removing high concentration total nitrogen, characterized in that: It comprises a base (1), on which an autotrophic denitrification tank (2), a medium water tank (3) and a clean water tank (4) are installed; The autotrophic denitrification tank (2) comprises a first tank body (201), a second tank body (202), a third tank body (203) and a fourth tank body (204) which are sequentially installed from bottom to top. A liquid inlet (205) and a backwash air inlet (206) are provided on the side wall of the first tank body (201), a liquid outlet (207) is provided on the side wall of the fourth tank body (204), a first filter baffle (208) is provided between the first tank body (201) and the second tank body (202), and a filter is installed on the first filter baffle (208). A plurality of water distribution filter heads (209) are provided, a second filter material baffle (2010) is provided between the second tank body (202) and the third tank body (203), a third filter material baffle (2011) is provided between the third tank body (203) and the fourth tank body (204), a pebble support layer (2012) is provided between the first filter material baffle (208) and the second filter material baffle (2010), and a sulfur autotrophic filler (2013) is provided between the second filter material baffle (2010) and the third filter material baffle (2011); The liquid inlet (205) is connected to a main liquid inlet pipe (5), the main liquid inlet pipe (5) is connected to the medium water tank (3) through a liquid inlet pipe (6) and a liquid inlet pump (7), the liquid inlet pipe (6) is connected to a return pipe (9) through a tee (8), the return pipe (9) is connected to the clean water tank (4) through a return pump (10), and the clean water tank (4) is connected to the main liquid inlet pipe (5) through a backwash pipe (11) and a backwash pump (12); The backwash air inlet (206) is connected to a backwash fan (14) via a backwash air inlet pipe (13), and the backwash fan (14) is fixed on the base (1); The liquid outlet (207) is connected to the clean water tank (4) via a liquid outlet pipe (15), and the liquid outlet pipe (15) is connected to the medium water tank (3) via a sewage pipe (16).

2. A pilot test device for removing high-concentration total nitrogen according to claim 1, characterized in that: A stirring shaft is arranged in the middle water tank (3), a stirring blade is arranged on the stirring shaft, and a stirring motor (17) is connected to the top of the stirring shaft.

3. A pilot test device for removing high concentration total nitrogen according to claim 2, characterized in that: An ultrasonic liquid level meter is arranged in the intermediate water tank (3).

4. A pilot test device for removing high concentration total nitrogen according to claim 3, characterized in that: The liquid inlet pipeline (6) is provided with a liquid inlet double union ball valve (18) and a first flow meter (19) in sequence from bottom to top, and the three-way piece (8) is located between the liquid inlet double union ball valve (18) and the first flow meter (19); the return pipeline (9) is provided with a return double union ball valve (20); and the backwash pipeline (11) is provided with a backwash double union ball valve (21) and a second flow meter (22) in sequence from bottom to top.

5. A pilot test device for removing high concentration total nitrogen according to claim 4, characterized in that: An air intake double-union ball valve (23), a gas flow meter (24) and a check valve (25) are sequentially arranged on the backwash air intake pipeline (13) from the backwash fan (14) to the backwash air intake port (206).

6. A pilot test device for removing high-concentration total nitrogen according to claim 5, characterized in that: A liquid outlet double-union ball valve (26) is provided on the liquid outlet pipe (15) near the clean water tank (4), and a sewage discharge double-union ball valve (27) is provided on the sewage discharge pipe (16).

7. A pilot test device for removing high-concentration total nitrogen according to claim 6, characterized in that: An external discharge port (28) is provided at the upper end of the side wall of the clean water tank (4), and an external discharge valve (29) is provided on the external discharge port (28).

8. A pilot test device for removing high-concentration total nitrogen according to claim 7, characterized in that: The first tank body (201) is fixed on the base (1) via a flange, and the first tank body (201) and the second tank body (202), the second tank body (202) and the third tank body (203), and the third tank body (203) and the fourth tank body (204) are all fixedly connected via flanges.

9. A pilot test device for removing high-concentration total nitrogen according to claim 8, characterized in that: A bracket (30) is provided on the base (1) at the periphery of the medium water tank (3) and the clean water tank (4), and the liquid inlet pump (7), the reflux pump (10) and the backwash pump (12) are all fixed on the bracket (30).

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