An intelligent biological desulfurization device

Abstract

The present disclosure provides an intelligent biological desulfurization device, which includes a spray tower, a regeneration tank, a sedimentation tank, and a nutrient solution supplement pump; the spray tower includes a packing layer; the regeneration tank includes a liquid inlet pipe, a pH monitoring device, a temperature monitoring device, a dissolved oxygen monitoring device, a sludge concentration monitoring device, a redox potentiometer, and a liquid outlet pipe; the liquid inlet pipe is connected to the spray tower alkali liquid outlet, and the liquid outlet pipe is connected to the spray tower alkali liquid inlet; a sewage pipeline is arranged at the bottom of the regeneration tank; the sedimentation tank is arranged in the regeneration tank; the nutrient solution supplement pump is arranged outside the regeneration tank, and the inlet of the nutrient solution supplement pump is connected to the outlet of the sewage treatment waste liquid. The device can greatly save operating costs, effectively prevent the spray tower from caking, and improve the desulfurization efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of biogas desulfurization, and in particular to an intelligent biological desulfurization device. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Biogas is produced by anaerobic fermentation of various organic substances in industrial wastewater. Its main components are methane, carbon dioxide and a small amount of hydrogen sulfide. The content of methane in biogas is 50-70%, and the content of carbon dioxide is 25-40%. The content of hydrogen sulfide in biogas produced by fermentation of different raw materials is different. Generally, the content of hydrogen sulfide is 1.5-20g / m 3 .

[0004] Hydrogen sulfide gas is a colorless, highly toxic, foul-smelling, flammable acidic gas that is very harmful to the human body. Under normal circumstances, the concentration of hydrogen sulfide in the air is 10-20 mg / m 3 , which can easily cause dizziness, nausea, and even unconsciousness; in a hot and humid environment, hydrogen sulfide gas can corrode pipes, metal equipment and other equipment that come into contact with biogas; if the hydrogen sulfide content exceeds 150mg / m 3 It will also seriously affect the utilization of biogas by generators and reduce economic added value.

[0005] At present, the commonly used desulfurization processes include dry desulfurization, wet desulfurization, and catalytic oxidation desulfurization. Compared with the biological desulfurization process, there are disadvantages such as secondary pollution and high operating costs. However, the inventors found that although the existing biological desulfurization process has certain advantages, it still has a series of problems. For example, the existing biological desulfurization process directly uses a nutrient solution made of glucose, ammonium chloride, etc. to provide nutrients for desulfurization bacteria. In order to ensure that the nutrients of the desulfurization bacteria are sufficient, an excessive amount of nutrient solution needs to be added. In this process, due to the large consumption of glucose, ammonium chloride and other agents, the operating cost of the desulfurization process is greatly increased; at the same time, the spray layer of the spray tower is very easy to harden, and the filler needs to be replaced frequently, which further increases the cost; moreover, during the desulfurization process, the activity of the desulfurization bacteria gradually decreases, and the entire biological desulfurization process takes a long time, which not only greatly reduces the desulfurization efficiency, but also further increases the operating cost; in addition, the existing biological desulfurization process has many manual operations, and the process is difficult to accurately and effectively control. How to improve the existing biological desulfurization process and solve the above problems at the same time has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] In order to solve the deficiencies of the prior art, the purpose of the present disclosure is to provide an intelligent biological desulfurization device, which uses sewage treatment waste liquid as a nutrient solution, avoiding the use of a large amount of glucose and other agents. At the same time, an intelligent sewage discharge system is set up in the regeneration tank and the sedimentation tank, which can discharge the sludge in time, ensuring the biological activity of the desulfurization bacteria and preventing the spray layer from hardening, which not only greatly reduces the operating cost but also ensures high desulfurization efficiency. In addition, the intelligent desulfurization process disclosed in the present disclosure avoids the disadvantages brought by manual operation by adding an automated control system, and can achieve accurate and effective control of the biological desulfurization process.

[0007] Specifically, the technical solution of the present disclosure is as follows:

[0008] In the first aspect of the present disclosure, the present disclosure provides an intelligent biological desulfurization device, which includes a spray tower, a regeneration tank, a sedimentation tank, and a nutrient solution supplement pump; the spray tower includes a packing layer; the regeneration tank includes an inlet pipe, a pH monitoring device, a temperature monitoring device, a dissolved oxygen monitoring device, a sludge concentration monitoring device, a redox potentiometer and an outlet pipe; the inlet pipe is connected to the alkali solution outlet of the spray tower, and the outlet pipe is connected to the alkali solution inlet of the spray tower; a sewage pipeline is arranged at the bottom of the regeneration tank; the sedimentation tank is arranged in the regeneration tank; the nutrient solution supplement pump is arranged outside the regeneration tank body, and the inlet of the nutrient solution supplement pump is connected to the outlet of the sewage treatment waste liquid.

[0009] In a second aspect of the present disclosure, the present disclosure provides an intelligent biological desulfurization process, which includes a hydrogen sulfide absorption process, an alkali solution regeneration process and a sewage discharge process;

[0010] The hydrogen sulfide absorption process is carried out in a spray tower; the alkali solution regeneration process includes that after the alkali solution containing hydrogen sulfide enters the regeneration tank, the desulfurization bacteria in the regeneration tank perform desulfurization oxidation treatment on the alkali solution containing hydrogen sulfide, wherein the start and stop of the fan is controlled by a dissolved oxygen monitoring device, air enters the regeneration tank through an aeration pipeline, the start and stop of the alkali solution replenishment pump is controlled by a pH monitoring device, the sewage treatment waste liquid is used as the nutrient solution for the desulfurization bacteria through a nutrient solution replenishment pump, and the temperature control system of the regeneration tank is controlled by a temperature monitoring device; the sewage discharge process includes using a sedimentation tank to perform solid-liquid separation on the sulfur sludge in the regeneration tank, controlling the discharge of the sewage discharge pipeline of the regeneration tank by a redox potentiometer, and controlling the opening of the sludge discharge pipeline in the sedimentation tank by a sludge concentration monitoring device; the regenerated alkali solution enters the spray tower again through the liquid outlet pipe for reuse.

[0011] In a third aspect of the present disclosure, the present disclosure provides an application of an intelligent biological desulfurization device in treating biogas.

[0012] One or more technical solutions in the present disclosure have the following beneficial effects:

[0013] (1) In the present disclosure, in order to solve the problem that the traditional nutrient solution for desulfurization bacteria is mostly glucose, ammonium chloride and other chemicals, which greatly increases the operating cost of the biological desulfurization process, the wastewater treatment waste liquid is used as the nutrient solution for desulfurization bacteria through a nutrient solution replenishing pump, thereby avoiding the use of a large amount of chemicals in the biological desulfurization process, thereby greatly reducing the operating cost of the biological desulfurization process.

[0014] (2) In the present disclosure, in order to solve the problem that the spray layer of the spray tower is very prone to compaction, the discharge of the sewage pipeline in the regeneration tank is controlled by using the redox potential. By discharging solid waste from the sewage pipeline in time, the compaction of the spray layer of the spray tower can be effectively prevented and the replacement cycle of the filler can be reduced.

[0015] (3) In the present disclosure, in order to solve the problem that the activity of desulfurization bacteria gradually decreases during the desulfurization process, resulting in a decrease in desulfurization efficiency, the living environment of microorganisms in the regeneration tank is controlled in a suitable state through automatic adjustment between different devices such as a dissolved oxygen monitoring device, a pH monitoring device, a temperature monitoring device, a redox potentiometer, and a sludge concentration monitoring device, thereby providing the best desulfurization liquid environment for the desulfurization bacteria; in particular, the desulfurization bacteria multiply rapidly in large quantities in the regeneration tank, which can easily lead to a large accumulation of desulfurization bacteria with low biological activity, thereby greatly reducing the overall biological activity of the desulfurization bacteria. For this reason, the present disclosure uses a redox potentiometer to detect the accumulation of solid waste in the regeneration tank, so as to regularly discharge the solid sludge in the regeneration tank, which can not only effectively prevent the spray tower from becoming calcified, but also effectively ensure that the desulfurization bacteria maintain a high biological activity, thereby improving the desulfurization efficiency of the biological desulfurization process.

[0016] (3) In the present disclosure, in order to solve the problem of much manual operation and difficult process control, the coordination between the monitoring devices such as dissolved oxygen monitoring device, pH monitoring device, temperature monitoring device, redox potentiometer and sludge concentration monitoring device is utilized to realize the automatic control of the entire biological desulfurization process, thus avoiding the disadvantages brought by manual operation, being able to accurately adjust the various parameters in the regeneration tank in a timely manner and improving the level of automation.

[0017] The blower start and stop are controlled by the dissolved oxygen monitoring device, the alkali solution replenishment pump start and stop are controlled by the pH monitoring device, the sewage treatment waste liquid is used as the nutrient solution for desulfurization bacteria by the nutrient solution replenishment pump, the temperature control system of the regeneration tank is controlled by the temperature monitoring device, the discharge of the regeneration tank sewage pipeline is controlled by the redox potential, and the opening of the sludge discharge pipeline in the sedimentation tank is controlled by the sludge concentration monitoring device. Through the coordination of the above-mentioned monitoring devices, the entire biological desulfurization process is automatically controlled.

[0018] (4) In the present disclosure, in order to solve the problem that the traditional biological desulfurization device occupies a large area, the sedimentation tank is set in the regeneration tank, which reduces the area occupied under the same process conditions and reduces the waste of pipes and land resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure.

[0020] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 is a schematic diagram of an intelligent biological desulfurization device of Example 1;

[0022] In the figure, 1-fan, 2-alkali solution supplement pump, 3-nutrient solution supplement pump, 4-pH monitoring device, 5-temperature monitoring device, 6-dissolved oxygen monitoring device, 7-sludge concentration monitoring device, 8-oxidation-reduction potentiometer, 9-sewage pipeline, 10-sedimentation tank, 11-sludge pipeline, 12-aeration pipeline, 13-liquid level meter, 14-regeneration tank, 15-temperature control system, 16-liquid outlet pipe, 17-air outlet pipe, 18-air inlet pipe, 19-spray tower, 20-filter plate, 21-partition, 22-liquid inlet pipe, 23-electric valve, 24-flow meter, 25-packing layer, 26-wastewater treatment waste liquid. DETAILED DESCRIPTION

[0023] The present disclosure is further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present disclosure and are not intended to limit the scope of the present disclosure. Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations and / or combinations thereof.

[0025] Terminology explanation:

[0026] pH Monitoring Device: refers to any device that can be used to monitor the pH value in the regeneration tank.

[0027] Temperature Monitoring Device: refers to any device that can be used to monitor temperature changes in the regeneration tank.

[0028] Dissolved oxygen monitoring device: refers to any device that can be used to monitor the dissolved oxygen content in the regeneration tank.

[0029] Sludge concentration monitoring device: refers to any device that can be used to monitor the sludge concentration in a sedimentation tank.

[0030] Wastewater treatment wastewater: refers to the effluent from the high-concentration wastewater produced by production after being treated by the sewage system, which contains low-concentration COD (less than 200), total nitrogen (less than 10), and total phosphorus (less than 5), in order to save the purchase of nutrient solution and clean water required for the desulfurization system. The desulfurization microorganisms use the effluent from the previous sewage treatment system as nutrient solution to ensure the growth needs of the desulfurization system microorganisms. In addition, since the nutrient concentration in the wastewater treatment wastewater is low, it will not inhibit the desulfurization microorganisms.

[0031] As introduced in the background technology, the existing biological desulfurization process directly uses nutrient solution made of glucose, ammonium chloride, etc. to provide nutrients for desulfurization bacteria, which greatly increases the operating cost of the desulfurization process; at the same time, the spray layer of the spray tower is very easy to harden, and the filler needs to be replaced frequently, which further increases the cost; moreover, during the desulfurization process, the activity of the desulfurization bacteria gradually decreases, and the entire biological desulfurization process takes a long time, which not only greatly reduces the desulfurization efficiency, but also further increases the operating cost; in addition, the existing biological desulfurization process has many manual operations, and the process is difficult to accurately and effectively control. In order to solve the technical problems existing in the prior art, the present disclosure provides an intelligent biological desulfurization device.

[0032] In one embodiment of the present disclosure, an intelligent biological desulfurization device includes a spray tower 19, a regeneration tank 14, a sedimentation tank 10, and a nutrient solution supplement pump 3; the spray tower 19 includes a packing layer 25; the regeneration tank 14 includes an inlet pipe 22, a pH monitoring device 4, a temperature monitoring device 5, a dissolved oxygen monitoring device 6, a sludge concentration monitoring device 7, a redox potentiometer 8 and an outlet pipe 16; the inlet pipe 22 is connected to the alkali solution outlet of the spray tower 19, and the outlet pipe 16 is connected to the alkali solution inlet of the spray tower 19; a sewage pipeline 9 is arranged at the bottom of the regeneration tank 14; the sedimentation tank 10 is arranged in the regeneration tank 14; the nutrient solution supplement pump 3 is arranged outside the regeneration tank 14, and the inlet of the nutrient solution supplement pump 3 is connected to the outlet of the sewage treatment waste liquid 26.

[0033] The spray tower 19 includes an air inlet pipe 18 and an air outlet pipe 17. The biogas containing hydrogen sulfide enters the spray tower 19 from the air inlet pipe 18 and passes through the packing layer 25 from bottom to top under the action of pressure. The alkali solution enters the spray tower 19 and is sprayed out from top to bottom. The biogas containing hydrogen sulfide and the alkali solution are fully in contact with each other after passing through the packing layer 25 to absorb hydrogen sulfide. The desulfurized gas is discharged from the air outlet pipe 17 of the spray tower 19, and the alkali solution containing hydrogen sulfide enters the regeneration tank 14.

[0034] An electric valve 23 is installed in the liquid inlet pipe 22 , and the alkaline solution containing hydrogen sulfide in the spray tower 19 enters the regeneration tank 14 through the liquid inlet pipe 22 .

[0035] An electric valve 23 is installed in the liquid outlet pipe 16, and the regenerated alkali solution enters the spray tower 19 again through the liquid outlet pipe 16 to be reused; the regeneration pool 14 contains desulfurization bacteria.

[0036] Furthermore, the nutrient solution supplement pump 3 adopts a clean water centrifugal pump, and the pump is started by feedback of the data signal of the redox potentiometer 8, 3-4 times / week, and each operation time is 1-3 hours.

[0037] Furthermore, the regeneration tank 14 includes a liquid level meter 13, which is used to control the liquid level of the alkali solution in the regeneration tank 14, and the liquid level is controlled to be no less than 300-800mm below the top of the regeneration tank. If the liquid level in the regeneration tank is too low, the spraying volume will gradually decrease or even fail to spray as the circulation time increases, resulting in the inability to effectively remove the sulfur component in the exhaust gas; if the liquid level is too high, it will affect the regeneration effect of the regeneration tank on the spray liquid, resulting in an increase in the frequency of spray liquid replacement and an increase in operating costs.

[0038] Furthermore, the regeneration tank 14 includes a filter plate 20, which is arranged at the inlet of the liquid outlet pipe 16 in the regeneration tank 14. The spray layer in the spray tower 19 is very prone to hardening. Therefore, it is very important to prevent the regeneration alkali solution entering the spray tower 19 from containing solid waste and causing the spray tower 19 to be blocked. In this case, a filter plate 20 is arranged at the inlet of the liquid outlet pipe 16 in the regeneration tank 14. The filter plate 20 can further filter the untreated solid waste, thereby achieving further purification of the regeneration alkali solution.

[0039] Furthermore, the filter plate 20 is made of glass fiber reinforced plastic, which has good anti-corrosion performance.

[0040] Furthermore, the regeneration pool 14 includes a temperature control system 15, which includes a heating and cooling plate. The temperature monitoring device 5 monitors the temperature of the liquid in the regeneration pool 14, and the temperature monitoring result is transmitted to the temperature control system 15. The temperature control system 15 adjusts the temperature to ensure that the regeneration pool 14 is within a reasonable temperature range. Specifically, the temperature in the regeneration pool 14 is controlled at 30-35°C. Preferably, the temperature is 33°C.

[0041] Further, the intelligent biological desulfurization device includes a fan 1, one end of which is connected to an aeration pipeline 12, and the aeration pipeline 12 is arranged in the body of a regeneration tank 14. The fan 1 is started and stopped by a dissolved oxygen monitoring device 6. After the fan 1 is turned on, air enters the regeneration tank 14 through the aeration pipeline 12. The content of dissolved oxygen in the regeneration tank 14 is 0.5-2.0 mg / L. The dissolved oxygen content within this range can not only completely oxidize hydrogen sulfide, but also the dissolved oxygen content within this range can keep the desulfurization bacteria at a high biological activity. If the content of dissolved oxygen is too high, then it will cause a large number of desulfurization bacteria to multiply. Once it is not discharged in time, it will cause a large number of low-bioactive desulfurization bacteria to accumulate, which not only reduces the biological activity of the overall desulfurization bacteria, but also reduces the desulfurization efficiency of the entire desulfurization process. In order to maintain the high efficiency of the overall desulfurization process, preferably, the content of dissolved oxygen is 1.5 mg / L.

[0042] Furthermore, the intelligent biological desulfurization device includes an alkali solution replenishment pump 2, which is a chemical pump. The alkali solution replenishment pump 2 uses the pH meter online detection data feedback signal to the alkali solution replenishment pump to provide alkali solution to the regeneration tank 14. The pH monitoring device 4 is used to monitor the pH value in the regeneration tank 14, and the start and stop of the alkali solution replenishment pump 2 outside the regeneration tank 14 is controlled by monitoring the pH value. When the pH is lower than 7, alkali solution is replenished.

[0043] The pH value of the liquid in the regeneration tank 14 is controlled at 7-8. In the biological desulfurization process, the desulfurization bacteria oxidize the hydrogen sulfide in the alkali solution, which not only converts the hydrogen sulfide into elemental sulfur and a small amount of sulfate, but also reduces the pH value of the alkali solution in the regeneration tank. The reduction in pH value not only reduces the absorption efficiency of the regenerated alkali solution for hydrogen sulfide, but also reduces the biological activity of the desulfurization bacteria. Preferably, the pH value is 8.

[0044] Furthermore, the operation frequency of the nutrient solution replenishment pump 3 is 5-10min at intervals of 2-4h; maintaining the biological activity of the desulfurization bacteria requires not only controlling the dissolved oxygen content and pH value in the regeneration tank, but also continuous replenishment of the nutrient solution. If the nutrient solution is not replenished in time, a large number of desulfurization bacteria will die. If the nutrient solution is replenished excessively, a large number of desulfurization bacteria will multiply, and low-activity desulfurization bacteria will also exist in large numbers, thereby reducing the overall biological activity of the desulfurization bacteria. Preferably, the pump is operated for 8min at intervals of 3h. Compared with the traditional method of adding excess nutrient solution to the regeneration tank, this embodiment has a higher advantage.

[0045] Further, the pH monitoring device 4 includes a pH meter for monitoring the pH value in the regeneration tank 14, and controlling the start and stop of the in vitro alkali solution replenishment pump 2 of the regeneration tank 14 by monitoring the pH value;

[0046] The pH meter implements online data display and data signal output. The data signal is fed back to the PLC host configuration software. The PLC contains program commands. When the data is lower than 7, it outputs a start signal to the liquid alkali replenishment pump.

[0047] Furthermore, the temperature monitoring device 5 includes a thermometer for monitoring the temperature in the regeneration tank 14, and adjusting the temperature in the regeneration tank 14 by controlling the temperature control system 15 through monitoring the temperature;

[0048] The thermometer implements online data display and data signal output, and the data signal is fed back to the PLC host configuration software. The PLC contains program commands. When the temperature is lower than 30℃, heating is performed, and when it is higher than 35℃, cooling is performed. The temperature control system does not operate within this range.

[0049] Furthermore, the dissolved oxygen monitoring device 6 includes a DO meter for monitoring the dissolved oxygen content in the regeneration tank 14, and controlling the start and stop of the fan 1 by monitoring the dissolved oxygen content;

[0050] The DO meter implements online data display and data signal output. The data signal is fed back to the PLC host configuration software. The PLC contains program commands. When the data is higher than 0.8mg / L, it stops running and is generally controlled at 0.5-1mg / L.

[0051] Furthermore, the redox potentiometer 8 is used to control the discharge cycle of the sewage pipeline 9 in the regeneration tank 14, and the sewage pipeline 9 is installed with a flow meter 24 and an electric valve 23;

[0052] The redox potentiometer implements online data display and data signal output, and the data signal is fed back to the PLC host configuration software. The PLC contains program commands and feeds them back to the electric valve to start and stop the valve.

[0053] Furthermore, the redox potential is controlled by the redox potentiometer 8 at -400--350 mV. If it is not within this numerical range, the PLC program will start the electric valve of the sewage pipeline to discharge the sludge in the regeneration tank. The low-activity desulfurization bacteria have poor decomposition and metabolism ability, but good cohesion. If the low-activity desulfurization bacteria in the regeneration tank are not discharged in time, a large number of low-activity desulfurization bacteria will gather, reducing the overall activity of the desulfurization bacteria, thereby reducing the overall biological desulfurization efficiency.

[0054] Furthermore, the sedimentation tank 10 is a radial flow sedimentation tank, which is mainly used to separate sulfur mud and spray liquid, with a surface load of 0.5-25m 3 / (m 2 .h).

[0055] The sludge is discharged when the sludge concentration in the sedimentation tank 10 is between 20000 and 30000 mg / L. Preferably, the sludge is discharged when the sludge concentration is 25000 mg / L.

[0056] The sedimentation tank 10 is placed in the regeneration tank 14. The partition 21 separates the sedimentation tank 10 from the regeneration tank 14. The sedimentation tank 10 is a conical structure.

[0057] Furthermore, the sedimentation tank 10 is connected to a sludge discharge pipeline 11 , a flow meter 24 and an electric valve 23 are installed on the sludge discharge pipeline 11 , and a sludge concentration monitoring device 7 controls the discharge of the sludge discharge pipeline 11 .

[0058] In one embodiment of the present disclosure, an intelligent biological desulfurization process, the intelligent biological desulfurization process includes a hydrogen sulfide absorption process, an alkali solution regeneration process and a sewage discharge process;

[0059] The hydrogen sulfide absorption process includes: biogas containing hydrogen sulfide enters the spray tower 19 from the air inlet pipe 18, passes through the packing layer 25 from bottom to top under the action of pressure, and the alkali solution enters the spray tower 19 and sprays out from top to bottom. The biogas containing hydrogen sulfide and the alkali solution fully contact and absorb hydrogen sulfide after passing through the packing layer 25, and the desulfurized gas is discharged from the outlet pipe 17 of the spray tower 19, and the alkali solution containing hydrogen sulfide enters the regeneration tank 14;

[0060] The alkali solution regeneration process includes: after the alkali solution containing hydrogen sulfide enters the regeneration tank 14, the desulfurization bacteria in the regeneration tank 14 perform desulfurization oxidation treatment on the alkali solution containing hydrogen sulfide, wherein the blower 1 is started and stopped by the dissolved oxygen monitoring device 6, the air enters the regeneration tank 14 through the aeration pipeline 12, the alkali solution replenishment pump 2 is started and stopped by the pH monitoring device 4, the sewage treatment wastewater is used as the desulfurization bacteria nutrient solution by the nutrient solution replenishment pump 3, and the temperature control system 15 of the regeneration tank 14 is controlled by the temperature monitoring device 5;

[0061] The sewage discharge process includes using a sedimentation tank 10 to separate the sulfur sludge in a regeneration tank 14 into solid and liquid, controlling the discharge of a sewage discharge pipeline 9 in the regeneration tank 14 by a redox potentiometer 8, and controlling the opening of a sludge discharge pipeline 11 in the sedimentation tank 10 by a sludge concentration monitoring device 7;

[0062] The regenerated alkali solution enters the spray tower 19 again through the liquid outlet pipe 16 for repeated use.

[0063] Furthermore, the wastewater treatment wastewater refers to the effluent from the high-concentration wastewater produced by production after being treated by the sewage system, which contains low-concentration COD (less than 200), total nitrogen (less than 10), and total phosphorus (less than 5), so as to save the purchase of nutrient solution and clean water required by the desulfurization system. The desulfurization microorganisms use the effluent from the previous sewage treatment system as nutrient solution to ensure the growth needs of the microorganisms in the desulfurization system. In addition, since the nutrient concentration in the wastewater treatment wastewater is low, it will not inhibit the desulfurization microorganisms.

[0064] The wastewater treatment wastewater is used as the nutrient solution for desulfurization bacteria by using a nutrient solution supplement pump to replace traditional agents such as glucose and ammonium chloride. This not only realizes the recycling of waste but also reduces the production cost of the biological separation process.

[0065] During the entire biological desulfurization process, no manual operation is required. The start and stop of the fan 1 is controlled by the detection result of the dissolved oxygen monitoring device 6. Once the dissolved oxygen content in the regeneration tank 14 is lower than 0.5 mg / L, the fan is operated to dissolve the air into the regeneration tank 14 through the aeration pipeline 12. Once the dissolved oxygen content is higher than 2.0 mg / L, the fan is stopped. At the same time, the start and stop of the alkali solution supplement pump 2 is controlled by the pH monitoring device, and the nutrient solution supplement pump 3 is connected to the sewage treatment waste liquid. The start and stop of the nutrient solution supplement pump is realized based on time control. In the process of monitoring dissolved oxygen and pH value, it is also necessary to simultaneously detect the temperature of the alkali solution in the regeneration tank 14. The temperature monitoring result is transmitted to the temperature control system 15. The temperature control system 15 realizes the temperature adjustment to ensure that the regeneration tank 14 is within a reasonable temperature range. In addition, while the above process is running, the discharge of the sewage discharge pipeline 9 is automatically controlled by the redox potentiometer 8, and the opening of the sludge discharge pipeline 11 is automatically controlled by the sludge concentration monitoring device 7, so as to ensure that low-activity desulfurization bacteria and solid substances such as sulfur are discharged from the regeneration tank 14 at the same time.

[0066] The various monitoring devices cooperate with each other to ensure the high activity of desulfurization bacteria. At the same time, the entire process does not require manual operation and has a high degree of automation. It is very sensitive to the monitoring of various parameters of the biological desulfurization process and can adjust the process parameters in a timely manner.

[0067] In one embodiment of the present disclosure, the regeneration tank 14 includes a liquid inlet pipe 22, in which an electric valve 23 is installed, and the alkaline solution containing hydrogen sulfide in the spray tower 19 enters the regeneration tank 14 through the liquid inlet pipe 22;

[0068] The liquid outlet pipe 16 is provided with an electric valve 23, and the regenerated alkali solution enters the spray tower 19 again through the liquid outlet pipe 16 for reuse; the regeneration pool 14 contains desulfurization bacteria;

[0069] An aeration pipeline 12 is disposed inside the regeneration tank 14 and is connected to a fan 1 outside the regeneration tank 14 to meet the dissolved oxygen demand of the desulfurization bacteria metabolism in the regeneration tank 14 through aeration;

[0070] The pH monitoring device 4 is used to monitor the pH value in the regeneration tank 14, and control the start and stop of the in vitro alkali liquid replenishment pump 2 of the regeneration tank 14 by monitoring the pH value; the pH meter implements online data display and data signal output, and the data signal is fed back to the PLC host computer configuration software. The PLC contains program commands. When the data is lower than 7, a start signal is output to the liquid alkali replenishment pump.

[0071] The temperature monitoring device 5 is used to monitor the temperature in the regeneration tank 14, and the temperature in the regeneration tank 14 is regulated by the temperature control system 15 through monitoring the temperature; the thermometer implements online data display and data signal output, and the data signal is fed back to the PLC host computer configuration software. The PLC contains program commands. When the temperature is lower than 30°C, heating is performed, and when it is higher than 35°C, cooling is performed. The temperature control system does not operate within this range.

[0072] The dissolved oxygen monitoring device 6 is used to monitor the dissolved oxygen content in the regeneration tank 14, and control the start and stop of the fan 1 by monitoring the dissolved oxygen content; the DO meter implements online data display and data signal output, and the data signal is fed back to the PLC host computer configuration software. The PLC contains program commands. When the data is higher than 2.0 mg / L, the operation is stopped, and it is generally controlled at 0.5-2.0 mg / L.

[0073] The redox potentiometer 8 is used to control the discharge of the sewage pipeline 9 in the regeneration tank 14, and the sewage pipeline 9 is installed with a flow meter 24 and an electric valve 23; the redox potentiometer implements online data display and data signal output, and the data signal is fed back to the PLC host computer configuration software, and the PLC contains program commands and feeds back to the electric valve to start and stop the valve.

[0074] In one embodiment of the present disclosure, the regeneration tank 14 further includes a sedimentation tank 10 and a sludge concentration monitoring device 7. The sedimentation tank 10 is placed in the regeneration tank 14. The partition 21 separates the sedimentation tank 10 and the regeneration tank 14. The sedimentation tank 10 is a conical structure. The sedimentation tank 10 adopts a radial flow sedimentation tank, which mainly separates sulfur sludge and spray liquid. The surface load is 0.5-25m 3 / (m 2 .h); wherein the sedimentation tank 10 is connected to a sludge discharge pipeline 11 so that the sludge is discharged through the sludge discharge pipeline 11, a flow meter 24 and an electric valve 23 are installed on the sludge discharge pipeline 11, and a sludge concentration monitoring device 7 controls the discharge of the sludge discharge pipeline 11; further, the regeneration tank 14 also includes a liquid level meter 13.

[0075] In one embodiment of the present disclosure, the intelligent desulfurization process includes an automatic control system; the automatic control system is connected to a pH monitoring device 4, a temperature monitoring device 5, a dissolved oxygen monitoring device 6, a redox potentiometer 8, and a sludge concentration monitoring device 7, and automatically coordinates with a flow meter 24 and an electric valve 23 through monitoring values ​​to control the start and stop of an alkali solution replenishment pump 2, a temperature control system 15, a fan 1, and the discharge cycles of a sewage pipeline 9 and a sludge pipeline 11.

[0076] In one embodiment of the present disclosure, the automatic control system further comprises a nutrient solution supplement pump 3, and the nutrient solution supplement pump 3 is provided with a time control device; the inlet of the nutrient solution supplement pump 3 is connected to the outlet of the sewage treatment waste liquid.

[0077] In one embodiment of the present disclosure, the intelligent biological desulfurization device is used in treating biogas.

[0078] In order to enable those skilled in the art to more clearly understand the technical solution of the present disclosure, the technical solution of the present disclosure will be described in detail below in conjunction with specific embodiments.

[0079] Example 1

[0080] This embodiment provides an intelligent biological desulfurization device, such as Figure 1 As shown, the intelligent biological desulfurization device includes a spray tower 19, a regeneration tank 14, a sedimentation tank 10, and a nutrient solution supplement pump 3. Among them, the spray tower 19 includes a packing layer 25, and the main material of the packing layer is a ball ring. The regeneration tank 14 includes an inlet pipe 22, a pH monitoring device 4, a temperature monitoring device 5, a dissolved oxygen monitoring device 6, a sludge concentration monitoring device 7, an oxidation-reduction potentiometer 8 and a liquid outlet pipe 16. The inlet pipe 22 is connected to the alkali outlet of the spray tower 19, so that the alkali in the spray tower 19 is reintroduced into the regeneration tank to achieve alkali regeneration. The liquid outlet pipe 16 is connected to the alkali inlet of the spray tower 19 to ensure that the regenerated alkali is recycled by the spray tower 19 again. At the same time, a sewage pipeline 9 is arranged at the bottom of the regeneration tank 14, and the sewage pipeline 9 is used to discharge the sludge in the regeneration tank in time. The sedimentation tank 10 is arranged in the regeneration tank 14, which can greatly reduce the floor area and further improve the alkali regeneration efficiency. The nutrient solution replenishing pump 3 is arranged outside the regeneration tank 14, and the inlet of the nutrient solution replenishing pump 3 is connected to the outlet of the sewage treatment waste liquid 26, which realizes the use of sewage treatment waste liquid as the nutrient solution for microorganisms for the first time, greatly reducing costs and improving waste utilization.

[0081] Example 2

[0082] The present embodiment provides an intelligent biological desulfurization process, using the intelligent biological desulfurization device described in Example 1, and the desulfurization process includes the following steps: hydrogen sulfide absorption process: biogas containing hydrogen sulfide enters the spray tower 19 from the air inlet pipe 18, and under the action of pressure, passes through the packing layer 25 from bottom to top, and the alkaline solution enters the spray tower 19 and sprays out from top to bottom. The biogas containing hydrogen sulfide and the alkaline solution are fully in contact after passing through the packing layer 25 to absorb hydrogen sulfide. The desulfurized gas is discharged from the air outlet pipe 17 of the spray tower 19, and the alkaline solution containing hydrogen sulfide enters the regeneration tank 14.

[0083] Alkali solution regeneration process: After the alkali solution containing hydrogen sulfide enters the regeneration tank 14, the desulfurization bacteria in the regeneration tank 14 perform desulfurization oxidation treatment on the alkali solution containing hydrogen sulfide. When the dissolved oxygen monitoring device 6 detects that the dissolved oxygen content is lower than 1.5 mg / L, the fan 1 is automatically turned on, and the operation of the fan drives the air to enter the regeneration tank 14 through the aeration pipeline 12. The dissolved oxygen content in the regeneration tank 14 is maintained at 1.5 mg / L through the automatic adjustment process. At the same time, since the pH value will decrease during the biological desulfurization process, the pH monitoring device 4 monitors the pH value of the regeneration tank 14. When the pH value is detected to be lower than 8, the alkali solution replenishment pump 2 will be automatically controlled to start, so as to replenish the alkali solution in the regeneration tank 14 and keep the pH at 8; in order to realize waste recycling and save costs at the same time, the sewage treatment waste liquid is used as the nutrient solution for desulfurization bacteria through the nutrient solution replenishment pump 3, wherein the sewage treatment waste liquid refers to the effluent of the high-concentration waste water produced by production after being treated by the sewage system, which contains low-concentration COD (within 200), total nitrogen (within 10), and total phosphorus (within 5), so as to save the purchase of nutrient solution agents and the amount of clean water required for the desulfurization system. The desulfurization microorganisms use the effluent of the previous sewage treatment system as the nutrient solution to ensure the growth needs of the microorganisms in the desulfurization system. In addition, since the nutrient concentration in the sewage treatment waste liquid is relatively low, it will not inhibit the desulfurization microorganisms. The nutritional needs of the desulfurization bacteria can be met. The nutrient solution replenishment pump 3 runs for 8 minutes at intervals of 3 hours to maintain the desulfurization bacteria at a high biological activity. The temperature of the regeneration tank 14 is controlled by the temperature monitoring device 5 to maintain it at 30°C. When the temperature is lower than 30°C, the temperature control system 15 automatically heats to meet the temperature requirements of the regeneration tank 14.

[0084] The sewage discharge process includes using the sedimentation tank 10 to separate the sulfur sludge in the regeneration tank 14 into solid and liquid. When the sludge concentration in the sedimentation tank 10 is 25000 mg / L, the sludge is discharged to achieve alkali solution regeneration. At the same time, when the potential of the redox potentiometer 8 is 400 mV, sewage is discharged from the regeneration tank 14. The regenerated alkali solution enters the spray tower 19 again from the liquid outlet pipe 16 for reuse.

[0085] The desulfurization bacteria used in this embodiment are obtained by regular screening using microorganisms from municipal sludge thickening tanks as the seed source and sodium sulfide as the matrix.

[0086] The biological desulfurization process of this embodiment uses the anaerobic PEIC effluent or the liquid in the middle of the aerobic tank as the nutrient solution, which includes COD, nitrogen, and phosphorus; the dissolved oxygen is controlled to 1.5 mg / L, the pH value of the liquid in the regeneration tank is 7, the temperature in the regeneration tank is controlled at 30°C, the discharge cycle of the sewage pipeline is 2 weeks / time, and the hydrogen sulfide removal rate is as high as 99%.

[0087] Embodiment 3:

[0088] The similarities between this embodiment and embodiment 2 are not repeated here. The difference is that in the alkali solution regeneration process of this embodiment, a filter plate 20 is arranged at the inlet of the liquid outlet pipe 16 of the regeneration tank 14 to achieve further filtration of the regenerated alkali solution and prevent solid waste from clogging the spray tower 19.

[0089] The biological desulfurization process of this embodiment uses the anaerobic PEIC effluent or the liquid in the middle of the aerobic tank as the nutrient solution, which includes COD, nitrogen, and phosphorus; the dissolved oxygen is controlled to 1.5 mg / L, the pH value of the liquid in the regeneration tank is 8, the temperature in the regeneration tank is controlled at 30°C, the discharge cycle of the sewage pipeline is 4 weeks / time, and the hydrogen sulfide removal rate is as high as 98%.

[0090] Embodiment 4:

[0091] The similarities between this embodiment and embodiment 2 are not repeated here. The difference is that the alkali solution regeneration process of this embodiment does not include controlling the discharge of the sewage pipeline 9 of the regeneration tank 14 by using the redox potentiometer 8.

[0092] The biological desulfurization process of this embodiment is adopted, with the anaerobic PEIC effluent or the liquid in the middle section of the aerobic tank as the nutrient solution, the nutrient solution includes COD, nitrogen, and phosphorus, the dissolved oxygen is controlled to 1.5 mg / L, the pH value of the liquid in the regeneration tank is 8, the temperature in the regeneration tank is controlled at 30°C, the discharge cycle of the sewage pipeline is 4 weeks / time, and the hydrogen sulfide removal rate is as high as 97.2%.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent biological desulfurization device, characterized in that: The intelligent biological desulfurization device comprises a spray tower (19), a regeneration tank (14), a sedimentation tank (10), and a nutrient solution supplement pump (3); the spray tower (19) comprises a packing layer (25); the regeneration tank (14) comprises a liquid inlet pipe (22), a pH monitoring device (4), a temperature monitoring device (5), a dissolved oxygen monitoring device (6), a sludge concentration monitoring device (7), a redox potentiometer (8), and a liquid outlet pipe (16); the liquid inlet pipe (22) is connected to the alkali solution outlet of the spray tower (19), and the liquid outlet pipe (16) is connected to the alkali solution inlet of the spray tower (19); a sewage discharge pipeline (9) is arranged at the bottom of the regeneration tank (14); the sedimentation tank (10) is arranged in the regeneration tank (14); the nutrient solution supplement pump (3) is arranged outside the regeneration tank (14), and the inlet of the nutrient solution supplement pump (3) is connected to the outlet of the sewage treatment waste liquid (26); The nutrient solution supplement pump (3) adopts a clean water centrifugal pump, and the pump is started by feedback of the data signal of the redox potentiometer (8), 3-4 times / week, and each operation time is 1-3 hours; The regeneration tank (14) comprises a filter plate (20), and the filter plate (20) is arranged at the inlet of the liquid outlet pipe (16) in the regeneration tank (14); The discharge of the sewage discharge pipeline (9) is automatically controlled by a redox potentiometer (8), and the opening of the sludge discharge pipeline (11) is automatically controlled by a sludge concentration monitoring device (7), so as to ensure that the low-activity desulfurization bacteria and the sulfur element solid matter are discharged from the regeneration tank (14) at the same time; The sedimentation tank (10) is a radial flow sedimentation tank; The partition (21) separates the sedimentation tank (10) from the regeneration tank (14), and the sedimentation tank (10) is a conical structure.

2. The intelligent biological desulfurization device according to claim 1, characterized in that: The regeneration tank (14) comprises a liquid level meter (13), and the liquid level meter (13) is used to control the liquid level of the alkali solution in the regeneration tank (14).

3. The intelligent biological desulfurization device according to claim 1, characterized in that: The filter plate (20) is made of glass fiber reinforced plastic.

4. The intelligent biological desulfurization device according to claim 1, characterized in that: The regeneration pool (14) comprises a temperature control system (15), and the temperature control system (15) comprises a heating and a cooling section.

5. The intelligent biological desulfurization device according to claim 1, characterized in that: The intelligent biological desulfurization device comprises a fan (1), one end of the fan (1) is connected to an aeration pipeline (12), and the aeration pipeline (12) is arranged in a regeneration tank (14).

6. The intelligent biological desulfurization device according to claim 1, characterized in that: The intelligent biological desulfurization device comprises an alkali solution replenishment pump (2), and the alkali solution replenishment pump (2) is a chemical pump.

7. The intelligent biological desulfurization device according to claim 1 is characterized in that: The sedimentation tank (10) is connected to a mud discharge pipeline (11), and a flow meter (24) and an electric valve (23) are installed on the mud discharge pipeline (11).

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