CN112473324A - Method for absorbing malodorous gas in sewage treatment and special device thereof - Google Patents
Method for absorbing malodorous gas in sewage treatment and special device thereof Download PDFInfo
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- CN112473324A CN112473324A CN202011302310.0A CN202011302310A CN112473324A CN 112473324 A CN112473324 A CN 112473324A CN 202011302310 A CN202011302310 A CN 202011302310A CN 112473324 A CN112473324 A CN 112473324A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1412—Controlling the absorption process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1468—Removing hydrogen sulfide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/304—Hydrogen sulfide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/306—Organic sulfur compounds, e.g. mercaptans
Abstract
The invention discloses a method for absorbing malodorous gas in sewage treatment and a special device thereof, belonging to the technical field of sewage treatment. According to the device for absorbing the malodorous gas in the sewage treatment, a plurality of absorption towers can be arranged in series or in parallel according to the concentration of the malodorous gas and the treatment requirement; the alkali liquor is sprayed from top to bottom to enter an absorption tower and contacts with malodorous gas from bottom to top, so that the malodorous gas is captured in the liquid, and malodorous gas molecules are removed after being absorbed and neutralized by strong base; and the spraying density of the alkali liquor can be controlled to realize the full absorption of the malodorous gas. The method for absorbing the malodorous gas in the sewage treatment carries out real-time monitoring on the treatment condition of the malodorous gas, reasonably sets the use condition of the device, and improves the efficiency.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a method for absorbing malodorous gas in sewage treatment and a special device thereof.
Background
The domestic sewage is subjected to anaerobic treatment in a septic tank, an anaerobic tank and the like, then aeration treatment is carried out, in the aeration process, odorous substances such as methyl mercaptan, methyl sulfide, methyl disulfide, ammonia gas and the like in the water overflow into the atmosphere along with airflow, and the odorous gases are mainly hydrogen sulfide and are easy to diffuse, so that people in the environment for a long time can have symptoms such as dizziness, headache, nausea, vomiting, general weakness, hydrogen sulfide smell in expiration, miosis, slow reaction and the like, and therefore, the odor generated by a sewage treatment plant has great harm to the surrounding environment and people, and deodorization measures are very necessary. The commonly adopted measures comprise a combustion method and an adsorption method, the combustion method needs additional auxiliary energy, combustion products are secondary pollutants such as sulfur dioxide and the like, the adsorption method needs to replace an adsorbent after saturated absorption, various inorganic and organic malodorous components cannot be completely absorbed, and the methods are difficult to popularize and apply in sewage treatment due to cost and other reasons.
In conclusion, the method for efficiently purifying the malodorous exhaust gas needs to be further optimized and combined.
Disclosure of Invention
The invention aims at solving the problems in the prior art and provides a method for absorbing malodorous gas in sewage treatment, which is used for monitoring the treatment condition of the malodorous gas in real time, wherein alkali liquor is sprayed into an absorption tower from top to bottom and contacts with the malodorous gas from bottom to top to capture the malodorous gas in liquid, and the malodorous gas molecules are absorbed by strong alkali and neutralized and then removed. Another technical problem to be solved by the present invention is to provide an apparatus for absorbing malodorous gas in sewage treatment, in which a plurality of absorption towers can be connected in series or in parallel according to the concentration of malodorous gas and the treatment requirement, thereby maximizing the treatment efficiency.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the method for absorbing the malodorous gas in the sewage treatment specifically comprises the following steps:
(1) checking whether the device is in a normal use state, checking the tightness of the gas pipeline and the liquid pipeline, and performing the step (2) after the checking and the proofreading are qualified;
(2) opening the aeration tank, starting the circulating pump to work, enabling the first air inlet valve, the first air outlet valve and the first liquid inlet valve to be in an open state, enabling other valves to be in a closed state, enabling malodorous gas to enter the first absorption tower from bottom to top through the first air inlet valve, enabling alkali liquor to enter the first absorption tower from top to bottom through the first liquid inlet valve, enabling the alkali liquor and the malodorous gas to form a reverse flow state, capturing the malodorous gas in liquid, and removing malodorous gas molecules after neutralization through absorption with strong alkali; the hydrogen sulfide concentration detection probe detects the concentration of the malodorous gas at the gas outlet and transmits a concentration value signal to the controller, and the controller judges the signal: if the detection value is smaller than the set limit value, entering the step (3); if the concentration value is larger than the set limit value, entering the step (4);
(3) the following valves continue to be opened: the second air inlet valve, the second liquid inlet valve, the second air outlet valve, the third air inlet valve, the third liquid inlet valve, the third air outlet valve, the fourth air inlet valve, the fourth air outlet valve and the fourth liquid inlet valve; forming a state that 4 absorption towers work in parallel; continuously detecting the concentration of the malodorous gas at the gas outlet by a hydrogen sulfide concentration detection probe until the treatment process is finished; carrying out manual intervention once abnormality occurs;
(4) close first air outlet valve, continue to open first cascade connection logical valve, second air outlet valve, second feed liquor valve, other valves are still in the closed condition, form the operating condition that first absorption tower and second absorption tower are established ties, and foul gas is continuous through the processing of two absorption towers, and hydrogen sulfide concentration test probe detects the foul gas concentration of gas outlet department to give the controller with concentration value signal transmission, the controller makes the judgement to the signal: if the detection value is smaller than the set limit value, entering the step (5); if the concentration value is larger than the set limit value, entering the step (6);
(5) the following valves continue to be opened: a third air inlet valve, a third liquid inlet valve, a third serial connection communicating valve and a fourth air outlet valve are added, and the working state of the third absorption tower and the working state of the fourth absorption tower in serial connection are increased, at the moment, the first absorption tower and the second absorption tower are connected in series to work as a group of processing devices, the third absorption tower and the fourth absorption tower are connected in series to work as a second group of processing devices, and the two groups of series connection devices work simultaneously; continuously detecting the concentration of the malodorous gas at the gas outlet by a hydrogen sulfide concentration detection probe until the treatment process is finished; carrying out manual intervention once abnormality occurs;
(6) closing the second gas outlet valve, opening the second serial connection communication valve, the third liquid inlet valve and the third gas outlet valve to form a state that the three absorption towers are connected in series, and continuously treating the malodorous gas by the three absorption towers; continuously detecting the concentration of the malodorous gas at the gas outlet by a hydrogen sulfide concentration detection probe until the treatment process is finished; and carrying out manual intervention once the abnormity occurs. According to many attempts in production practice, three absorption towers are operated continuously enough to achieve effective removal of malodorous gases.
The method for absorbing the foul gas in the sewage treatment comprises the step of spraying the alkali liquor with the spraying density of 12000-18000L/m2 .h; the alkali liquor is sodium hydroxide solution.
The absorption device of the foul gas in the sewage treatment comprises an aeration tank, an alkaline liquid tank, a controller and 4 absorption towers, wherein the absorption towers are respectively a first absorption tower, a second absorption tower, the bottom of a third absorption tower and a fourth absorption tower; a base is arranged on the aeration tank; the absorption tower is arranged on the base;
a first air inlet pipeline and a first liquid outlet pipeline are arranged at the bottom of the first absorption tower, and a first air inlet valve is arranged on the first air inlet pipeline; a first air outlet pipeline and a first liquid inlet pipeline are arranged at the top of the first absorption tower, a first air outlet valve is arranged on the first air outlet pipeline, and a first liquid inlet valve is arranged on the first liquid inlet pipeline; a second air inlet pipeline and a second liquid outlet pipeline are arranged at the bottom of the second absorption tower, and a second air inlet valve is arranged on the second air inlet pipeline; a second gas outlet pipeline and a second liquid inlet pipeline are arranged at the top of the second absorption tower, a second gas outlet valve is arranged on the second gas outlet pipeline, and a second liquid inlet valve is arranged on the second liquid inlet pipeline; a third air inlet pipeline and a third liquid outlet pipeline are arranged at the bottom of the third absorption tower, and a third air inlet valve is arranged on the third air inlet pipeline; a third air outlet pipeline and a third liquid inlet pipeline are arranged at the top of the third absorption tower, a third air outlet valve is arranged on the third air outlet pipeline, and a third liquid inlet valve is arranged on the third liquid inlet pipeline; a fourth air inlet pipeline and a fourth liquid outlet pipeline are arranged at the bottom of the fourth absorption tower, and a fourth air inlet valve is arranged on the fourth air inlet pipeline; a fourth gas outlet pipeline and a fourth liquid inlet pipeline are arranged at the top of the fourth absorption tower, and a fourth gas outlet valve is arranged on the fourth gas outlet pipeline; a fourth liquid inlet valve is arranged on the fourth liquid inlet pipeline;
the first liquid inlet pipeline, the second liquid inlet pipeline, the third liquid inlet pipeline and the fourth liquid inlet pipeline are connected with a total liquid inlet pipe, the total liquid inlet pipe is connected with an alkali liquor pool, and a circulating pump is arranged on the total liquid inlet pipe; the first gas outlet pipeline, the second gas outlet pipeline, the third gas outlet pipeline and the fourth gas outlet pipeline are all connected with a hydrogen sulfide concentration detection probe, and the hydrogen sulfide concentration detection probe is electrically connected with the controller.
In the device for absorbing the foul gas in the water treatment, a first serial pipe is arranged between the first air outlet pipe and the second air inlet pipe, and a first serial connecting and communicating valve is arranged on the first serial pipe; a second series pipe is arranged between the second air outlet pipeline and the third air inlet pipeline, and a second series communicating valve is arranged on the second series pipe; and a third series pipe is arranged between the third air outlet pipeline and the fourth air inlet pipeline, and a third series communicating valve is arranged on the third series pipe.
One end of each of the first air inlet pipeline, the second air inlet pipeline, the third air inlet pipeline and the fourth air inlet pipeline extends into the aeration tank and above the liquid level, and the other end of each of the first air inlet pipeline, the second air inlet pipeline, the third air inlet pipeline and the fourth air inlet pipeline extends into the absorption tower.
The device for absorbing the foul gas in the water treatment comprises a base, wherein two sides of the base are provided with support frames, and the support frames are fixed on the ground.
Has the advantages that: compared with the prior art, the invention has the advantages that:
(1) according to the device for absorbing the malodorous gas in the sewage treatment, a plurality of absorption towers can be arranged in series or in parallel according to the concentration of the malodorous gas and the treatment requirement; the alkali liquor is sprayed from top to bottom to enter an absorption tower and contacts with the malodorous gas from bottom to top, the malodorous gas is captured in the liquid, and the malodorous gas molecules are removed from the malodorous gas after being absorbed and neutralized by strong alkali; the spraying speed of the alkali liquor can be controlled to realize the full absorption of the malodorous gas.
(2) The method for absorbing the malodorous gas in the sewage treatment carries out real-time monitoring on the treatment condition of the malodorous gas, reasonably sets the use condition of the device, and improves the efficiency.
Drawings
FIG. 1 is a schematic view showing the structure of an apparatus for absorbing malodorous gas in sewage treatment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.
Example 1
The structure of the device for absorbing malodorous gas in sewage treatment is shown in figure 1. As shown in figure 1, the device comprises an aeration tank 1, an alkali liquor tank 7, a controller 4 and 4 absorption towers 3; a base 2 is arranged on the aeration tank 1; two sides of the base 2 are provided with supporting frames which are fixed on the ground; 4 absorption towers 3 are arranged above the base 2;
a first air inlet pipeline and a first liquid outlet pipeline are arranged at the bottom of the first absorption tower, and a first air inlet valve 5 is arranged on the first air inlet pipeline; a first air outlet pipeline and a first liquid inlet pipeline are arranged at the top of the first absorption tower, a first air outlet valve 6 is arranged on the first air outlet pipeline, and a first liquid inlet valve 9 is arranged on the first liquid inlet pipeline;
a second air inlet pipeline and a second liquid outlet pipeline are arranged at the bottom of the second absorption tower, and a second air inlet valve 12 is arranged on the second air inlet pipeline; a second gas outlet pipeline and a second liquid inlet pipeline are arranged at the top of the second absorption tower, a second gas outlet valve 13 is arranged on the second gas outlet pipeline, and a second liquid inlet valve 14 is arranged on the second liquid inlet pipeline;
a third air inlet pipeline and a third liquid outlet pipeline are arranged at the bottom of the third absorption tower, and a third air inlet valve 17 is arranged on the third air inlet pipeline; a third gas outlet pipeline and a third liquid inlet pipeline are arranged at the top of the third absorption tower, a third gas outlet valve 19 is arranged on the third gas outlet pipeline, and a third liquid inlet valve 18 is arranged on the third liquid inlet pipeline;
a fourth air inlet pipeline and a fourth liquid outlet pipeline are arranged at the bottom of the fourth absorption tower, and a fourth air inlet valve 22 is arranged on the fourth air inlet pipeline; a fourth gas outlet pipeline and a fourth liquid inlet pipeline are arranged at the top of the fourth absorption tower, and a fourth gas outlet valve 23 is arranged on the fourth gas outlet pipeline; a fourth liquid inlet valve 24 is arranged on the fourth liquid inlet pipeline;
a first series connection pipe 10 is arranged between the first air outlet pipeline and the second air inlet pipeline, and a first series connection through valve 11 is arranged on the first series connection pipe 10; a second series pipe 15 is arranged between the second air outlet pipeline and the third air inlet pipeline, and a second series communication valve 16 is arranged on the second series pipe 15; a third series pipe 20 is arranged between the third air outlet pipeline and the fourth air inlet pipeline, and a third series communicating valve 21 is arranged on the third series pipe 20;
one end of the first air inlet pipeline, one end of the second air inlet pipeline, one end of the third air inlet pipeline and one end of the fourth air inlet pipeline extend into the aeration tank 1 and above the liquid level, and the other end of the first air inlet pipeline, the second air inlet pipeline, the third air inlet pipeline and the fourth air inlet pipeline extend into the absorption tower. Liquid outlet pipelines of all absorption towers are not shown in the attached drawings, and the liquid outlet pipelines are used for introducing used alkali liquor waste liquid into a waste liquid pool. The first liquid inlet pipeline, the second liquid inlet pipeline, the third liquid inlet pipeline and the fourth liquid inlet pipeline are connected with a total liquid inlet pipe 8, the total liquid inlet pipe 8 is connected with an alkali liquor pool 7, and a circulating pump is arranged on the total liquid inlet pipe 8; the first air outlet pipeline, the second air outlet pipeline, the third air outlet pipeline and the fourth air outlet pipeline are all connected with a hydrogen sulfide concentration detection probe 25, the hydrogen sulfide concentration detection probe 25 is electrically connected with the controller 4, and the controller 4 controls the opening or closing of all valves.
The absorption device of the foul gas in the sewage treatment, a plurality of absorption towers can be arranged in series or in parallel according to the concentration of the foul gas and the treatment requirement; the number of absorption towers in the device disclosed in the embodiment is 4, and more absorption devices can be arranged by adopting the same principle.
Example 2
The method for absorbing and removing malodorous gas by using the device for absorbing malodorous gas in sewage treatment in the embodiment 1 specifically comprises the following steps:
(1) checking whether the device is in a normal use state, checking the tightness of the gas pipeline and the liquid pipeline, and performing the step (2) after the checking and the proofreading are qualified;
(2) the aeration tank 1 is opened, the circulating pump starts to work, so that the first air inlet valve 5, the first air outlet valve 6 and the first liquid inlet valve 9 are in an open state, other valves are in a closed state, malodorous gas enters the first absorption tower from bottom to top through the first air inlet valve 5, alkali liquor enters the first absorption tower from top to bottom through the first liquid inlet valve 9, the alkali liquor and the malodorous gas form a reverse flow state, the malodorous gas is captured in liquid, and malodorous gas molecules are removed after being neutralized through absorption with strong base, so that the purpose of removing the malodorous gas is achieved; the hydrogen sulfide concentration detection probe 25 detects the concentration of the malodorous gas at the gas outlet, and transmits a concentration value signal to the controller 4, and the controller 4 judges the signal: if the detection value is smaller than the set limit value, entering the step (3); if the concentration value is larger than the set limit value, entering the step (4);
(3) the following valves continue to be opened: a second air inlet valve 12, a second liquid inlet valve 14, a second air outlet valve 13, a third air inlet valve 17, a third liquid inlet valve 18, a third air outlet valve 19, a fourth air inlet valve 22, a fourth air outlet valve 23 and a fourth liquid inlet valve 24; forming a state that 4 absorption towers work in parallel; the hydrogen sulfide concentration detection probe 25 continuously detects the concentration of the malodorous gas at the gas outlet until the treatment process is finished; carrying out manual intervention once abnormality occurs;
(4) closing the first gas outlet valve 6, continuing to open the first serial connection through valve 11, the second gas outlet valve 13 and the second liquid inlet valve 14, and keeping other valves in a closed state to form a working state of the first absorption tower and the second absorption tower connected in series, wherein the malodorous gas continuously passes through the two absorption towers, the hydrogen sulfide concentration detection probe 25 detects the concentration of the malodorous gas at the gas outlet, and transmits a concentration value signal to the controller 4, and the controller 4 judges the signal: if the detection value is smaller than the set limit value, entering the step (5); if the concentration value is larger than the set limit value, entering the step (6);
(5) the following valves continue to be opened: a third air inlet valve 17, a third liquid inlet valve 18, a third serial connection communicating valve 21 and a fourth air outlet valve 23 are added, the serial working state of a third absorption tower and a fourth absorption tower is increased, at the moment, the first absorption tower and the second absorption tower are connected in series to work as a group of processing devices, the third absorption tower and the fourth absorption tower are connected in series to work as a second group of processing devices, and the two groups of serial devices work simultaneously; the hydrogen sulfide concentration detection probe 25 continuously detects the concentration of the malodorous gas at the gas outlet until the treatment process is finished; carrying out manual intervention once abnormality occurs;
(6) the second gas outlet valve 13 is closed, the second serial connection communication valve 16, the three liquid inlet valve 18 and the third gas outlet valve 19 are opened to form a state that the three absorption towers are connected in series, and the malodorous gas is continuously treated by the three absorption towers; the hydrogen sulfide concentration detection probe 25 continuously detects the concentration of the malodorous gas at the gas outlet until the treatment process is finished; and carrying out manual intervention once the abnormity occurs. According to many attempts in production practice, three absorption towers are operated continuously enough to achieve effective removal of malodorous gases.
According to the device for absorbing the malodorous gas in the sewage treatment, a plurality of absorption towers can be arranged in series or in parallel according to the concentration of the malodorous gas and the treatment requirement; the alkali liquor is sprayed from top to bottom to enter an absorption tower and contacts with malodorous gas from bottom to top, so that the malodorous gas is captured in the liquid, and malodorous gas molecules are removed after being absorbed and neutralized by strong base; and the spraying density of the alkali liquor can be controlled to realize the full absorption of the malodorous gas. The method for absorbing the malodorous gas in sewage treatment monitors the treatment condition of the malodorous gas in real time, reasonably sets the service condition of the device, and improves the efficiency.
Claims (6)
1. The method for absorbing the malodorous gas in sewage treatment is characterized by comprising the following steps:
(1) checking whether the device is in a normal use state, checking the tightness of the gas pipeline and the liquid pipeline, and performing the step (2) after the checking and the proofreading are qualified;
(2) opening the aeration tank (1), starting the circulating pump to work, enabling the first air inlet valve (5), the first air outlet valve (6) and the first liquid inlet valve (9) to be in an open state, enabling other valves to be in a closed state, enabling malodorous gas to enter a first absorption tower from bottom to top through the first air inlet valve (5), and enabling alkali liquor to enter the first absorption tower from top to bottom through the first liquid inlet valve (9); the hydrogen sulfide concentration detection probe (25) detects the concentration of the malodorous gas at the gas outlet, and transmits a concentration value signal to the controller (4), and the controller (4) judges the signal: if the detection value is smaller than the set limit value, entering the step (3); if the concentration value is larger than the set limit value, entering the step (4);
(3) the following valves continue to be opened: a second air inlet valve (12), a second liquid inlet valve (14), a second air outlet valve (13), a third air inlet valve (17), a third liquid inlet valve (18), a third air outlet valve (19), a fourth air inlet valve (22), a fourth air outlet valve (23) and a fourth liquid inlet valve (24); forming a state that 4 absorption towers work in parallel; the hydrogen sulfide concentration detection probe (25) continuously detects the concentration of the malodorous gas at the gas outlet until the treatment process is finished; carrying out manual intervention once abnormality occurs;
(4) close first air outlet valve (6), continue to open first series connection through valve (11), second air outlet valve (13), second feed liquor valve (14), other valves are still in the closure state, form the operating condition that first absorption tower and second absorption tower are established ties, foul gas is continuous through the processing of two absorption towers, hydrogen sulfide concentration detection probe (25) detect gas outlet department foul gas concentration to give controller (4) with concentration value signal transmission, controller (4) are judged to the signal: if the detection value is smaller than the set limit value, entering the step (5); if the concentration value is larger than the set limit value, entering the step (6);
(5) the following valves continue to be opened: a third air inlet valve (17), a third liquid inlet valve (18), a third serial connection communicating valve (21) and a fourth air outlet valve (23) are added, and the serial connection working state of a third absorption tower and a fourth absorption tower is increased; the hydrogen sulfide concentration detection probe (25) continuously detects the concentration of the malodorous gas at the gas outlet until the treatment process is finished; carrying out manual intervention once abnormality occurs;
(6) closing the second gas outlet valve (13), and opening the second serial connection communication valve (16), the third liquid inlet valve (18) and the third gas outlet valve (19) to form a state that the three absorption towers are connected in series; the hydrogen sulfide concentration detection probe (25) continuously detects the concentration of the malodorous gas at the gas outlet until the treatment process is finished; and carrying out manual intervention once the abnormity occurs.
2. The method for absorbing malodorous gases in sewage treatment as claimed in claim 1, wherein the spraying density of the alkali solution is 12000-18000L/m2H; the alkali liquor is sodium hydroxide solution.
3. The device for absorbing the malodorous gas in sewage treatment is characterized by comprising an aeration tank (1), an alkaline liquid tank (7), a controller (4) and 4 absorption towers (3), wherein the absorption towers (3) are respectively a first absorption tower, a second absorption tower, the bottom of a third absorption tower and a fourth absorption tower; a base (2) is arranged on the aeration tank (1); the absorption tower (3) is arranged on the base (2);
a first air inlet pipeline and a first liquid outlet pipeline are arranged at the bottom of the first absorption tower, and a first air inlet valve (5) is arranged on the first air inlet pipeline; a first air outlet pipeline and a first liquid inlet pipeline are arranged at the top of the first absorption tower, a first air outlet valve (6) is arranged on the first air outlet pipeline, and a first liquid inlet valve (9) is arranged on the first liquid inlet pipeline; a second air inlet pipeline and a second liquid outlet pipeline are arranged at the bottom of the second absorption tower, and a second air inlet valve (12) is arranged on the second air inlet pipeline; a second gas outlet pipeline and a second liquid inlet pipeline are arranged at the top of the second absorption tower, a second gas outlet valve (13) is arranged on the second gas outlet pipeline, and a second liquid inlet valve (14) is arranged on the second liquid inlet pipeline; a third air inlet pipeline and a third liquid outlet pipeline are arranged at the bottom of the third absorption tower, and a third air inlet valve (17) is arranged on the third air inlet pipeline; a third gas outlet pipeline and a third liquid inlet pipeline are arranged at the top of the third absorption tower, a third gas outlet valve (19) is arranged on the third gas outlet pipeline, and a third liquid inlet valve (18) is arranged on the third liquid inlet pipeline; a fourth air inlet pipeline and a fourth liquid outlet pipeline are arranged at the bottom of the fourth absorption tower, and a fourth air inlet valve (22) is arranged on the fourth air inlet pipeline; a fourth gas outlet pipeline and a fourth liquid inlet pipeline are arranged at the top of the fourth absorption tower, and a fourth gas outlet valve (23) is arranged on the fourth gas outlet pipeline; a fourth liquid inlet valve (24) is arranged on the fourth liquid inlet pipeline;
the first liquid inlet pipeline, the second liquid inlet pipeline, the third liquid inlet pipeline and the fourth liquid inlet pipeline are connected with a total liquid inlet pipe (8), the total liquid inlet pipe (8) is connected with an alkaline liquid pool (7), and a circulating pump is arranged on the total liquid inlet pipe (8); the first gas outlet pipeline, the second gas outlet pipeline, the third gas outlet pipeline and the fourth gas outlet pipeline are all connected with a hydrogen sulfide concentration detection probe (25), and the hydrogen sulfide concentration detection probe (25) is electrically connected with the controller (4).
4. A device for absorbing malodorous gas in water treatment as claimed in claim 3, wherein a first series pipe (10) is arranged between the first outlet pipe and the second inlet pipe, and a first series connection valve (11) is arranged on the first series pipe (10); a second series pipe (15) is arranged between the second air outlet pipeline and the third air inlet pipeline, and a second series communication valve (16) is arranged on the second series pipe (15); a third series pipe (20) is arranged between the third air outlet pipeline and the fourth air inlet pipeline, and a third series communicating valve (21) is arranged on the third series pipe (20).
5. The device for absorbing malodorous gas in water treatment as claimed in claim 3, wherein one end of the first air inlet pipeline, the second air inlet pipeline, the third air inlet pipeline and the fourth air inlet pipeline extends into the aeration tank (1) above the liquid level, and the other end extends into the absorption tower.
6. The device for absorbing malodorous gas in water treatment as claimed in claim 3, wherein the base (2) is provided with support frames at both sides, and the support frames are fixed on the ground.
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| CN202011302310.0A CN112473324A (en) | 2020-11-19 | 2020-11-19 | Method for absorbing malodorous gas in sewage treatment and special device thereof |
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| CN202011302310.0A CN112473324A (en) | 2020-11-19 | 2020-11-19 | Method for absorbing malodorous gas in sewage treatment and special device thereof |
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