CN112843999B - Biological treatment process and device for sulfur-containing and nitrogen-containing waste gas - Google Patents
Biological treatment process and device for sulfur-containing and nitrogen-containing waste gas Download PDFInfo
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Abstract
The invention discloses a biological treatment process and a device for sulfur-containing and nitrogen-containing waste gas, wherein the sulfur-containing and nitrogen-containing waste gas firstly passes through a biological denitrification chamber, most of nitrogen-containing pollutants in the waste gas are adsorbed and degraded by denitrification liquid, the primarily purified waste gas enters a biological desulfurization chamber to remove the sulfur-containing pollutants and residual organic pollutants and then is discharged, the denitrification liquid for adsorbing and degrading the nitrogen-containing pollutants is sprayed into the biological desulfurization chamber, desulfurization microorganisms degrade and regenerate the denitrification liquid, and the regenerated denitrification liquid flows back to the biological denitrification chamber to be sprayed circularly. Compared with the prior art, the invention has the advantages of high treatment efficiency, impact load resistance, energy consumption saving, gas escape reduction, sludge discharge reduction, simple and convenient management operation, low operation cost and the like.
Description
Technical Field
The invention relates to the field of waste gas treatment, in particular to a biological treatment process and a biological treatment device for sulfur-containing and nitrogen-containing waste gas.
Background
Sulfur-containing gases (e.g., hydrogen sulfide, mercaptans, sulfides) and nitrogen-containing gases (e.g., ammonia, trimethylamine) are the two most common types of malodorous gases. The sulfur-containing and nitrogen-containing waste gas in the environment mainly comes from industrial production such as food processing plants, farms, sludge and sewage treatment plants and the like, and the waste gas not only has irritation, but also is easy to cause sensory discomfort and aversion of people, and seriously endangers the respiratory system and the nervous system of a human body.
At present, a biological method (comprising biological filtration, biodegradation, biological washing, soil filtration and the like) is a mainstream technology for treating malodorous gas, and has the characteristics of economic investment, convenience in maintenance and management, low operation cost and no secondary pollution.
Although the biological washing is easy to control, the washing liquid which adsorbs and absorbs the pollutants in the waste gas in the traditional biological washing process needs to be matched with a special regeneration reaction tank, and the washing liquid is regenerated by aerating the regeneration reaction tank. However, the traditional aeration regeneration process inevitably causes that part of adsorbed and absorbed pollutants are directly blown off by airflow without degradation and are discharged into the atmosphere, so that secondary pollution is generated. Meanwhile, the aeration means that an additional high-pressure fan and an additional aeration pipeline are needed, the system is complex, and the energy consumption is high. The energy consumption of the biological trickling filter is low, but a nutrient solution is additionally added in the treatment process to maintain the microbial activity. The biological filter is mainly suitable for treating low-concentration and large-air-volume waste gas, occupies a large area, and is difficult to adapt to occasions with excessively severe waste gas concentration fluctuation. Most of malodorous waste gas discharged in modern industrial production contains sulfur and nitrogen, the discharged concentration is variable, and the malodorous waste gas is treated by a single biological treatment technology and is difficult to bear impact load.
The desulfurization strain oxidizes sulfur-containing pollutants to produce acid reaction, so that the alkalinity is consumed rapidly, the pH value is reduced rapidly, the optimum pH value of the denitrification strain is 6-8 generally, and the acid environment is not beneficial to the growth of the denitrification strain. The denitrification strain can generate alkalinity and the pH value rises in the denitrification reaction process, and is not beneficial to the growth of the desulfurization strain. Therefore, the problem of mutual inhibition between the environment suitable for different floras and the floras needs to be solved by adopting a biological method to treat the sulfur-containing and nitrogen-containing waste gas.
In conclusion, for the treatment of the sulfur-containing and nitrogen-containing waste gas with complex components and high concentration, the traditional biological treatment process needs to increase the investment and energy consumption to achieve better effect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a sulfur-containing and nitrogen-containing waste gas biological treatment process and a device thereof, which have the advantages of high efficiency, energy conservation, economy and stable operation.
In a first aspect, the invention provides a biological treatment process for sulfur-containing and nitrogen-containing waste gas, which comprises the following steps:
(1) the waste gas containing sulfur and nitrogen is sent to a biological denitrification chamber by a fan and passes through a denitrification filler layer from bottom to top, and simultaneously, denitrification liquid at the regeneration section of a denitrification liquid collecting tank is sprayed from top to bottom by a denitrification spraying device, and the denitrification liquid contains Mg (OH)2And the functional component of the activated sludge, in the process of gas-liquid two-phase contact, nitrogen-containing pollutants in the waste gas are adsorbed and degraded by activated sludge zoogles in the denitrification liquid, and the adsorbed denitrification liquid falls to a denitrification section of a denitrification liquid collecting tank;
(2) the waste gas after primary purification enters a biological desulfurization chamber through an air duct, passes through a desulfurization packing layer from bottom to top, sulfur-containing pollutants in the waste gas are absorbed and degraded by microorganisms growing on the surface of the packing, the purified tail gas is discharged from a top air outlet, meanwhile, a denitrogenation liquid in a denitrogenation liquid collecting tank denitrification section is sprayed from top to bottom through a desulfurization spraying device, the denitrogenation liquid provides nitrogen nutrition for the microorganisms on the desulfurization packing layer when contacting with the desulfurization packing layer, and Mg (OH) in the denitrogenation liquid2And H2S reaction to Mg (H)2S2)，Mg(H2S2) Then further reacts with oxygen in the desulfurization packing layer to generate MgSO4Auxiliary removing small part of H by biological flora in the filler layer2S, continuing to adsorb, absorb and aerobically decompose part of dissolved nitrogen-containing pollutants in the denitrified solution by free activated sludge, contacting part of dissolved sulfur-containing pollutants in the denitrified solution with microorganisms growing on the surface of a desulfurization packing layer and oxidatively degrading the dissolved nitrogen-containing pollutants, recovering the activity of the denitrified solution after contacting with the desulfurization packing layer to complete regeneration, and dropping the regenerated denitrified solution into a desulfurization collecting tank;
(3) adding NaOH into the desulfurization liquid collecting tank, adjusting the pH value of the regenerated denitrification liquid to 6-8, and carrying out the same operationThe NaOH and MgSO in the regenerated denitrified solution4Reaction to produce Mg (OH)2，Mg(OH)2Dissociation into Mg2+And OH-And the regenerated denitrification liquid can maintain the pH value between 6 and 8 for a long time, and the regulated regenerated denitrification liquid flows back to the regeneration section of the denitrification liquid collecting tank from the desulfurization liquid collecting tank.
As an improvement of the invention, the activated sludge in the denitrified solution mainly comprises one or more of nitrobacillus, hyphomicrobacter, pseudomonas, bacillus, zoogloeoscillus and xanthomonas and extracellular polymers thereof.
As an improvement of the invention, the microbial nutrition on the desulfurization packing layer is derived from NO generated by adsorption and degradation of the denitrified solution3 -And slow-release PO in organic substance and biological desulfurization filler4 3-、SO4 2-、K+、Fe3+、Mg2+、Ca2+、Na+The nutrient salt does not need to be added additionally.
As an improvement of the invention, in the desulfurization packing layer, oxygen in the waste gas forms an aerobic environment on the surface of the packing, and sulfur-containing pollutants are degraded into SO under the respiratory metabolism of microorganisms4 2-And is discharged through the pores.
As an improvement of the invention, MgSO contained in the regenerated denitrified solution4Promotes the generation of extracellular polymeric substances which can enhance the adsorption capacity of the biological denitrification liquid to gaseous pollutants, and the mechanism mainly comprises the following steps:
1) as the extracellular polymeric substance on the activated sludge in the denitrified liquid has the function of maintaining the structure of the microbial aggregate, and the surface of the functional group has negative charges, the extracellular polymeric substance can provide a site to be combined with magnesium ions, and the magnesium ions can be used as an enzyme activator to promote microbial flocs to secrete more extracellular polymeric substances and bacterial colonies. The hydrophobic extracellular polymeric substance can be combined with the hydrophobic organic substance, so that the adsorption capacity to the hydrophobic organic substance is enhanced by the extracellular polymeric substance generated in a large amount.
2) The added extracellular polymeric substance can generate more carboxyl, and the carboxyl can promote the bridging of the extracellular polymeric substance and organic matters, thereby enhancing the biological adsorption.
3) The magnesium ions are divalent ions, so that the potential energy barrier of the extracellular polymeric substance can be effectively reduced, the electric double layer of the extracellular polymeric substance is compressed, and the adsorption and condensation of the extracellular polymeric substance on nitrogen-containing and sulfur-containing gaseous pollutants are further increased.
In a second aspect, the invention provides a biological treatment device for waste gas containing sulfur and nitrogen, which comprises a biological denitrification chamber, a biological desulfurization chamber and a dosing tank, wherein the biological denitrification chamber and the biological desulfurization chamber are communicated sequentially through an air duct;
the biological denitrification chamber is sequentially provided with a denitrification spraying device, a denitrification filler layer, a guide plate and a denitrification liquid collecting tank from top to bottom; the biological desulfurization chamber is sequentially provided with a desulfurization spraying device, a desulfurization packing layer and a desulfurization liquid collecting tank from top to bottom;
a fixed baffle is arranged in the denitrification liquid collecting tank to divide the denitrification liquid collecting tank into a denitrification section and a regeneration section, and an outlet at the bottom of the guide plate is positioned above the denitrification section; the denitrification section is connected with the desulfurization spraying device, the denitrification liquid collecting tank is connected with the regeneration section, and the regeneration section is connected with the denitrification spraying device to form a denitrification liquid circulation loop;
the side wall of the biological denitrification chamber below the denitrification filler layer is provided with an air inlet, and the other side wall above the denitrification filler layer is provided with an air inlet of an air duct; the side wall of the biological desulfurization chamber below the desulfurization packing layer is provided with an air duct air outlet, and the top wall of the other side above the desulfurization packing layer is provided with an air outlet;
the denitrified solution contains Mg (OH)2And functional components of the activated sludge are that the denitrification liquid enters a biological desulfurization chamber after adsorbing and degrading nitrogen-containing pollutants in the waste gas in the biological denitrification chamber, so that nitrogen nutrition is provided for microorganisms fixedly growing on a desulfurization packing layer, and meanwhile, the microorganisms are assisted to remove H in the waste gas2S and finishing regeneration;
the dosing tank is connected with the desulfurization collecting tank and used for adding a NaOH solution into the desulfurization collecting tank and adjusting the pH value of the regenerated denitrification liquid to 6-8.
As an improvement of the invention, the filler of the desulfurization filler layer is homogeneous filler, the particle size range is 8-20 mm, the porosity of the filler layer is 40-45%, and the compressive strength is 7-10 Mpa.
As an improvement of the invention, the guide plate is in an inverted frustum shape, the upper end of the guide plate is fixed on the inner wall of the biological denitrification chamber, the inclination angle is 45-60 degrees, and the lower end of the guide plate forms a funnel-shaped cavity.
As an improvement of the invention, the medicine adding tank is filled with NaOH solution with the mass concentration of 25%.
As an improvement of the invention, the top of the biological desulfurization chamber is also provided with a flushing device for flushing the desulfurization packing layer, so that the increase of the resistance of the biological desulfurization packing caused by the death of microorganisms at the upper part and the middle part of the packing layer is avoided.
Compared with the prior art, the invention has the beneficial effects that:
1. the denitrified liquid in the invention contains Mg (OH)2Can assist the biological desulfurization section to effectively remove part of H in the waste gas2And S, the desulfurization capability of the biological desulfurization section is enhanced. MgSO produced at the same time4Can enhance the capability of the denitrified liquid to adsorb the waste gas containing the nitrogen pollutants. On the other hand, NaOH and MgSO (MgSO) are added in the denitrified solution4Mg (OH) produced by the reaction2Realizing Mg (OH)2And (4) regeneration, namely recycling Mg, and maintaining the pH value of the denitrification section of the denitrification liquid collecting tank between 6 and 8 for a long time.
2. The biological desulfurization section has the functions of fully purifying sulfur-containing pollutants and residual pollutants in the waste gas, and simultaneously, the oxygen in the waste gas is used for regenerating denitrified liquid which adsorbs the pollutants, so that the denitrified liquid can be recycled, the investment of a regeneration reactor is saved, the investment cost is reduced, the whole regeneration stage does not need additional aeration oxygenation, the operation energy consumption is saved, and simultaneously, no malodorous gas escapes. The regenerated denitrification liquid flows back to the biological denitrification section, and the discharge of sludge is reduced in the whole treatment process.
3. The microbial nutrition of the biological desulfurization section is derived from NO absorbed and degraded by the biological denitrification section3 -And organic substance and PO slowly released from desulfurization packing layer4 3-、SO4 2-、K+、Fe3+、Mg2+、Ca2+、Na+And nutrient salt is added, so that additional nutrient solution is not needed, and labor and cost are saved.
4. When the invention is used for treating the high-concentration sulfur-containing and nitrogen-containing waste gas, most of waste gas pollutants are firstly adsorbed and degraded by the activated sludge in the denitrification liquid in the biological denitrification section, then the sulfur-containing pollutants are removed in the biological desulfurization section, and simultaneously the degradation and regeneration of the activated sludge are completed, so that the impact load caused by overhigh inlet gas concentration can be effectively reduced, the treatment efficiency is improved, and the invention is suitable for the emission standard of malodorous pollutants with higher requirements.
Drawings
FIG. 1 is a schematic structural diagram of a biological treatment device for sulfur-containing and nitrogen-containing waste gas:
description of reference numerals: 1-an air intake exhauster; 2-denitrification spray water pump; 3-a biological denitrification chamber; 4-an air inlet; 5-inverted frustum-shaped guide plate; 6-denitrification filler layer; 7-a denitrification spraying device; 8-denitrification liquid collecting tank; 81-denitrification section; 82-a regeneration section; 9-an air duct; 10-a desulfurization liquid collecting tank; 11-a desulfurization packing layer; 12-cleaning the spraying device; 13-a desulfurization spray device; 14-an air outlet; 15-air outlet exhaust fan; 16-a biological desulfurization chamber; 17-a desulfurization spray water pump; 18-a medicine adding tank; 19-a dosing pump; 20-a baffle plate; 21-denitrogenation liquid.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Example 1
As shown in fig. 1, the embodiment discloses a biological treatment device for sulfur-containing and nitrogen-containing waste gas, which mainly comprises an air inlet exhaust fan 1, a denitrification spray water pump 2, a biological denitrification chamber 3, an air duct 9, an air outlet exhaust fan 15, a biological desulfurization chamber 16, a desulfurization spray water pump 17, a dosing tank 18, a dosing pump 19, and a matched pipeline, valve and control system.
The biological denitrification chamber 3 is sequentially provided with a denitrification spraying device 7, a denitrification filler layer 6, an inverted frustum-shaped guide plate 5 and a denitrification liquid collecting tank 8 from top to bottom. The biological desulfurization chamber 16 is provided with a desulfurization spray device 13, a desulfurization packing layer 11 and a desulfurization liquid collecting tank 10 from top to bottom in sequence.
The denitrification liquid collecting groove 8 is internally provided with a fixed baffle 20 which divides the denitrification liquid collecting groove 8 into a denitrification section 81 and a regeneration section 82. The upper end of the inverted frustum-shaped guide plate 5 is fixed on the inner wall of the biological denitrification chamber 3, the inclination angle is 45-60 degrees, the lower end is positioned right above the denitrification section 81, a funnel-shaped cavity is formed, and denitrification liquid sprayed from the denitrification spraying device 7 is guided to the denitrification section 81.
The bottom of the denitrification section 81 is connected with a desulfurization spray device 13 through a pipeline and a desulfurization spray water pump 17, and denitrification liquid sprayed by the desulfurization spray device 13 is collected to the desulfurization liquid collecting tank 10 below. The bottom of the desulfurization liquid collecting tank 10 is provided with a reflux liquid outlet and is connected with the bottom of the regeneration section 82 through a pipeline. The bottom of the regeneration section 82 is connected with a denitrification spraying device 7 through a pipeline and a denitrification spraying water pump 2 at the same time, thereby forming a denitrification liquid circulation loop.
The denitrified solution 21 contains Mg (OH)2The functional component of the activated sludge is activated sludge, and the activated sludge is composed of one or more of nitrobacillus, hyphomicrobium, pseudomonas, bacillus, zoogloea and xanthomonas and extracellular polymers thereof.
The biological denitrification chamber 3 and the biological desulfurization chamber 16 are arranged side by side and connected through an air duct 9. The left side wall of the biological denitrification chamber 3 below the denitrification filler layer 6 is provided with an air inlet 4, and the right side wall above the denitrification filler layer 6 is provided with an air inlet of an air duct. The left side wall of biological desulfurization chamber 16 below desulfurization packing layer 11 is equipped with the wind channel air outlet, and the right side roof that is located desulfurization packing layer 11 top is equipped with gas outlet 14.
The air inlet exhaust fan 1 is connected with an air inlet 4 of the biological denitrification chamber 3. The exhaust blower 15 is connected to the outlet 14 of the biological desulfurization chamber 16 to form a gas flow path.
The medicament stored in the medicament adding tank 18 is NaOH solution with the mass concentration of 25%, and is connected with the bottom of the desulfurization liquid collecting tank 10 through a pipeline and a medicament adding pump 19.
Preferably, the top of the biological desulfurization chamber 16 is provided with a cleaning water inlet pipe and a flushing device 12 for flushing the desulfurization packing layer 11, so that the increase of the resistance of the biological desulfurization packing due to the death of microorganisms at the upper part and the middle part of the packing layer is avoided.
Preferably, the filler of the desulfurization filler layer 11 should be homogeneous filler, the particle size of the filler should be basically uniform, the optional particle size range is 8-20 mm, and in order to avoid the blockage of the denitrification liquid on the filler layer, the porosity of the filler layer needs to be ensured to be 40-45%, and the compressive strength is 7-10 MPa.
Example 2
The embodiment discloses a biological treatment process of sulfur-containing and nitrogen-containing waste gas, which is realized based on the device of embodiment 1 and comprises the following steps:
the sulfur-containing and nitrogen-containing waste gas enters the biological denitrification chamber 3 through the air inlet exhaust fan 1 and the air inlet 4, passes through the denitrification filler layer 6 from bottom to top, and is discharged to the biological desulfurization chamber 16 from the top of the biological denitrification chamber 3 through the air duct 9.
The denitrogenation liquid of the regeneration section 82 of the denitrogenation collecting tank 8 is pumped to the denitrogenation spray set 7 at the top of the biological denitrogenation chamber 3 through the denitrogenation spray water pump 2, spray from top to bottom through the shower nozzle, and form the countercurrent contact with the waste gas from bottom to top, in the two-phase contact process of gas-liquid, because the activated sludge zoogloea in the denitrogenation liquid is most to belong to the denitrogenation bacterial, therefore most nitrogenous gaseous pollutants are degraded by zoogloea and activated sludge surface adsorption in the waste gas, the denitrogenation liquid after the absorption then falls to the denitrogenation section 81 of the denitrogenation collecting tank through the inverted cone-shaped guide plate 5.
The waste gas after the preliminary purification that gets into biological desulfurization chamber 16 passes desulfurization packing layer 11 from bottom to top, and the microorganism that contains sulphur pollutant in the waste gas and grows on desulfurization packing layer 11 surface adsorbs degradation, and the tail gas after the purification is discharged from air outlet 14 at biological desulfurization chamber 16 top under the drive of exhaust fan 15 of giving vent to anger.
Meanwhile, the denitrogenation liquid absorbing nitrogen-containing pollutants in the denitrogenation section 81 is pumped to the desulfurization spraying device 13 at the top of the biological desulfurization chamber 16 through the desulfurization spraying water pump 17, and is sprayed from the top to the bottom of the biological desulfurization chamber 16, and the denitrogenation liquid is in contact with the desulfurization packing layer 11, so that nitrogen nutrition is provided for microorganisms fixedly growing on the denitrogenation liquid in the contact process, and the microorganism nutrition on the desulfurization packing layer 11 is derived from NO generated by the adsorption and degradation of the denitrogenation liquid3 -And slow-release PO in organic substance and biological desulfurization filler4 3-、SO4 2-、K+、Fe3+、Mg2+、Ca2+、Na+And the nutrient salt is not required to be added additionally.
In the process of contacting with the desulfurization packing layer 11, the denitrified liquid 21 contains Mg (OH)2And H2S, etc. sulfur-containing gas reacts to generate MgSO4Assisting the microorganism to transform H2S is removed, and the chemical reaction formula is as follows:
Mg(OH)2+XH2S→Mg(OH)2·(H2S)X→Mg(H2S2)+2O2→MgSO4
meanwhile, in the contact process with the desulfurization packing layer 11, part of dissolved nitrogen-containing pollutants in the denitrification liquid is continuously adsorbed, absorbed and aerobically decomposed by activated sludge in a free state, and part of dissolved sulfur-containing pollutants is contacted with microorganisms growing on the surface of the desulfurization packing layer 11 and is oxidized and degraded.
In this way, the denitrification liquid after contacting with the desulfurization packing layer 11 recovers the activity and completes the regeneration, and the regenerated denitrification liquid falls down into the desulfurization liquid collecting tank 10.
Because the surface of the desulfurization filler layer 11 is of a porous structure, a plurality of pores exist and are wastedOxygen in the gas forms an aerobic environment on the surface of the filler, and sulfur-containing organic matters are degraded into SO under the respiratory metabolism of microorganisms4 2-Through the outside emission in hole, this belongs to the acid production reaction, can lead to the denitrogenation liquid pH after the regeneration to descend, and the most suitable pH of general denitrogenation fungus is 6~8, so in order to keep the activity of denitrogenation fungus, need add the pH of NaOH regulation denitrogenation liquid after the regeneration to between 6~8 to desulfurization collecting tank 10 through adding medicine jar 18.
At the same time, NaOH and MgSO in denitrified liquid4Reaction to produce Mg (OH)2Albeit Mg (OH)2Small solubility, but dissociation into Mg2+And OH-The speed of the method is continuous, and the pH value of the regenerated denitrification liquid can be kept between 6 and 8 for a long time.
The regenerated denitrogenation liquid enters the regeneration section 82 of the denitrogenation liquid collecting tank 8 through a return liquid outlet at the bottom of the desulfurization liquid collecting tank 10. The regenerated denitrified liquid contains Mg (OH)2And activated sludge for restoring the biosorption performance.
In summary, the present invention provides a biological treatment process and apparatus for waste gas containing sulfur and nitrogen, wherein the waste gas containing sulfur and nitrogen passes through a biological denitrification chamber, most of the nitrogen-containing pollutants in the waste gas are adsorbed and degraded by denitrification liquid, the waste gas after primary purification enters the biological desulfurization chamber to remove the sulfur-containing pollutants and residual organic pollutants, and then is discharged, and simultaneously the denitrification liquid adsorbing and degrading the nitrogen-containing pollutants is sprayed into the biological desulfurization chamber, the desulfurization microorganisms degrade and regenerate the denitrification liquid, and the regenerated denitrification liquid flows back to the biological denitrification chamber to perform cyclic spraying. Compared with the prior art, the invention has the advantages of high treatment efficiency, impact load resistance, energy consumption saving, gas escape reduction, sludge discharge reduction, simple and convenient management operation, low operation cost and the like.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes and modifications made according to the spirit of the present disclosure should be covered within the scope of the present disclosure.
Claims (10)
1. A biological treatment process for sulfur-containing and nitrogen-containing waste gas is characterized by comprising the following steps: the method comprises the following steps:
(1) the waste gas containing sulfur and nitrogen is sent to a biological denitrification chamber by a fan and passes through a denitrification filler layer from bottom to top, and simultaneously, denitrification liquid at the regeneration section of a denitrification liquid collecting tank is sprayed from top to bottom by a denitrification spraying device, and the denitrification liquid contains Mg (OH)2And the functional component active sludge, in the gas-liquid two-phase contact process, the nitrogenous pollutants in the waste gas are adsorbed and degraded by the activated sludge zoogloea in the denitrogenation liquid, and the adsorbed denitrogenation liquid falls to the denitrogenation section of the denitrogenation liquid collecting tank;
(2) the waste gas after preliminary purification gets into biological desulfurization room through the wind channel, from bottom to top passes the desulfurization packing layer, and the pollutant that contains sulphur in the waste gas is absorbed the degradation by the microorganism that packs surface growth, and the tail gas after the purification is discharged by top air outlet, and simultaneously, the denitrogenation liquid of denitrogenation collecting tank denitrogenation section sprays through desulfurization spray set top-down, and in denitrogenation liquid and desulfurization packing layer contact process, firstly provide nitrogen element nutrition for the microorganism on the desulfurization packing layer, secondly Mg (OH) in the denitrogenation liquid2And H2S reaction to Mg (H)2S2)，Mg(H2S2) Then further reacts with oxygen in the desulfurization packing layer to generate MgSO4Auxiliary removing small part of H by biological flora in the filler layer2S, continuing to adsorb, absorb and aerobically decompose part of dissolved nitrogen-containing pollutants in the denitrified solution by free activated sludge, contacting part of dissolved sulfur-containing pollutants in the denitrified solution with microorganisms growing on the surface of a desulfurization packing layer and oxidatively degrading the dissolved nitrogen-containing pollutants, recovering the activity of the denitrified solution after contacting with the desulfurization packing layer to complete regeneration, and dropping the regenerated denitrified solution into a desulfurization collecting tank;
(3) adding NaOH into the desulfurization liquid collecting tank, adjusting the pH value of the regenerated denitrification liquid to 6-8, and simultaneously adding the NaOH and MgSO (MgSO) in the regenerated denitrification liquid4Reaction to produce Mg (OH)2，Mg(OH)2Dissociation into Mg2+And OH-So that the regenerated denitrified liquid can maintain the pH value between 6 and 8 for a long time, and the regulated regenerated denitrified liquid flows back from the desulfurization liquid collecting tankIn the regeneration section of the denitrification liquid collecting tank.
2. The biological treatment process of the waste gas containing sulfur and nitrogen as claimed in claim 1, characterized in that: the activated sludge in the denitrified liquid mainly comprises one or more of nitrobacillus, hyphomicrobium, pseudomonas, bacillus, zoogloea and xanthomonas and extracellular polymers thereof.
3. The biological treatment process of the waste gas containing sulfur and nitrogen as claimed in claim 1, characterized in that: the microbial nutrition on the desulfurization packing layer is derived from NO generated by adsorption and degradation of the denitrified solution3 -And slow-release PO in organic substance and biological desulfurization filler4 3-、SO4 2-、K+、Fe3+、Mg2+、Ca2+、Na+The nutrient salt does not need to be added additionally.
4. The biological treatment process of the waste gas containing sulfur and nitrogen as claimed in claim 1, characterized in that: in the desulfurization packing layer, oxygen in the waste gas forms an aerobic environment on the surface of the packing, and sulfur-containing pollutants are degraded into SO under the respiratory metabolism of microorganisms4 2-And is discharged through the pores.
5. The biological treatment process of the waste gas containing sulfur and nitrogen as claimed in claim 1, characterized in that: MgSO contained in the regenerated denitrified solution4Promotes the generation of extracellular polymeric substances which can enhance the adsorption capacity of the biological denitrification liquid to gaseous pollutants.
6. The utility model provides a contain sulphur nitrogenous waste gas biological treatment device which characterized in that: comprises a biological denitrification chamber, a biological desulfurization chamber and a dosing tank, wherein the biological denitrification chamber and the biological desulfurization chamber are communicated through an air duct in sequence;
the biological denitrification chamber is sequentially provided with a denitrification spraying device, a denitrification filler layer, a guide plate and a denitrification liquid collecting tank from top to bottom; the biological desulfurization chamber is sequentially provided with a desulfurization spraying device, a desulfurization packing layer and a desulfurization liquid collecting tank from top to bottom;
a fixed baffle is arranged in the denitrification liquid collecting tank to divide the denitrification liquid collecting tank into a denitrification section and a regeneration section, and an outlet at the bottom of the guide plate is positioned above the denitrification section; the denitrification section is connected with a desulfurization spraying device, the desulfurization liquid collecting tank is connected with a regeneration section, and the regeneration section is connected with the denitrification spraying device to form a denitrification liquid circulation loop;
the side wall of the biological denitrification chamber below the denitrification filler layer is provided with an air inlet, and the other side wall above the denitrification filler layer is provided with an air inlet of an air duct; the side wall of the biological desulfurization chamber below the desulfurization packing layer is provided with an air duct air outlet, and the top wall of the other side above the desulfurization packing layer is provided with an air outlet;
the denitrified solution contains Mg (OH)2And functional components of the activated sludge are that the denitrification liquid enters a biological desulfurization chamber after adsorbing and degrading nitrogen-containing pollutants in the waste gas in the biological denitrification chamber, so that nitrogen nutrition is provided for microorganisms fixedly growing on a desulfurization packing layer, and meanwhile, the microorganisms are assisted to remove H in the waste gas2S and completing the regeneration;
the dosing tank is connected with the desulfurization collecting tank and used for adding a NaOH solution into the desulfurization collecting tank and adjusting the pH value of the regenerated denitrification liquid to 6-8.
7. The biological treatment device for the waste gas containing sulfur and nitrogen as claimed in claim 6, wherein: the filler of the desulfurization filler layer is homogeneous filler, the particle size range is 8-20 mm, the porosity of the filler layer is 40-45%, and the compressive strength is 7-10 Mpa.
8. The biological treatment device for the waste gas containing sulfur and nitrogen as claimed in claim 6, wherein: the guide plate is in an inverted frustum shape, the upper end of the guide plate is fixed on the inner wall of the biological denitrification chamber, the inclination angle is 45-60 degrees, and the lower end of the guide plate forms a funnel-shaped cavity.
9. The biological treatment device for the waste gas containing sulfur and nitrogen as claimed in claim 6, wherein: and the medicine adding tank is filled with NaOH solution with the mass concentration of 25%.
10. The biological treatment device for the waste gas containing sulfur and nitrogen as claimed in claim 6, wherein: and the top of the biological desulfurization chamber is also provided with a flushing device for flushing the desulfurization packing layer.
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| US9586176B2 (en) * | 2013-10-25 | 2017-03-07 | Evoqua Water Technologies Llc | Biofilter with fuzzy logic control |
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