CN112404121A - Spiral stirring type bioreactor and method for repairing organic contaminated soil - Google Patents
Spiral stirring type bioreactor and method for repairing organic contaminated soil Download PDFInfo
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- CN112404121A CN112404121A CN202011122105.6A CN202011122105A CN112404121A CN 112404121 A CN112404121 A CN 112404121A CN 202011122105 A CN202011122105 A CN 202011122105A CN 112404121 A CN112404121 A CN 112404121A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
Abstract
The invention discloses a spiral stirring type bioreactor and a method for restoring organic contaminated soil, belonging to the field of bioremediation of organic contaminated soil. The reactor mainly comprises a reactor tank body, a base bracket, a liquid spraying device, a left-right rotating direction spiral stirring device, an excitation solid-liquid separation device, a driving device, an aeration device and the like. The steps of utilizing the reactor to repair the organic contaminated soil comprise: the polluted soil is put into the tank body from the feeding hole, and the spraying device sprays biological cleaning liquid and bacterial liquid; fully mixing the soil and the cleaning solution by spiral stirring; the aeration device is utilized to ensure that the oxygen content in the tank body is not lower than 1.5 mg/L; after synchronous stirring and aeration for a certain time, the water and soil are separated by using an excitation solid-liquid separation device, and the restoration is completed. The invention has good mass transfer effect, thorough reaction, low sewage treatment load and high treatment efficiency, and can effectively treat medium-high concentration and difficult-degradation organic polluted soil.
Description
Technical Field
The invention relates to the technical field of bioremediation of organic contaminated soil, in particular to a spiral stirring type bioreactor and a method for remedying the organic contaminated soil.
Background
With the rapid development of industrial production, township enterprises and township in rural areas, the problem of organic soil pollution is becoming more and more serious. The organic polluted soil is treated mainly by physical, chemical and biological remediation methods. The physical repair method can reduce the concentration of pollutants, but has higher treatment cost; although the chemical remediation method can realize the removal of various pollutants, the chemical remediation method also has the defects of secondary pollution, high treatment cost and the like; the bioremediation method is to reduce the concentration of organic pollutants or make the organic pollutants completely harmless by utilizing the life metabolic activity of microorganisms, can simultaneously degrade different types of organic pollutants, has the advantages of low cost, normal function recovery of the repaired soil and the like, and the repairing cost is only 30-50 percent of that of the traditional physical and chemical remediation method. However, the bioremediation process is complex and slow, and the environmental factors influencing the remediation efficiency are more, and the traditional bioremediation method such as soil cultivation, biological ventilation, prefabricated bed, composting and other process parameters are difficult to control.
The bioreactor method is a microorganism remediation technology based on a slurry system, and comprises the steps of digging out polluted soil, mixing the soil with water with the volume of 2-5 times, stirring the soil into slurry, transferring most pollutants in the soil into the water, inoculating microorganisms into the system for treatment, and then treating the soil after dehydration. The basic principle is that organic pollutants are degraded into CO2 and H2O by microorganisms, the degradation process of the pollutants is accelerated by regulating and controlling parameters of soil pH, humidity, temperature, ventilation, nutrient salt addition and the like, and special domesticated and constructed engineering microorganisms can be inoculated to improve the degradation efficiency. Compared with the traditional biological repair method, the method has the characteristics of short treatment period, easy control of degradation conditions and good treatment effect.
However, when the bioreactor is used for repairing the organic contaminated soil, due to the reasons that cohesive soil particles are fine, the specific surface area is large, the content of strong bonding water among the fine particles is high and the like, the organic contaminants are tightly adsorbed on the surfaces of the soil particles and even occupy a small part of soil pores, and most of microorganisms exist in the water phase of the soil, so that the microorganisms are difficult to contact with the contaminants to generate effective biodegradation. Meanwhile, the organic pollutants have high hydrophobicity, and the desorption and transfer of the pollutants from soil particles cannot be effectively promoted only by using clear water, so that the contact area of the pollutants and microorganisms is limited, the repair efficiency is limited, and the maintenance time of 2-3 months is usually required. Therefore, when the bioreactor technology is used for repairing the organic polluted soil, the defects of long repair time, complex process, high cost and the like exist.
Disclosure of Invention
Aiming at the defects of the existing bioreactor technology, the invention aims to provide a horizontal spiral stirring type soil remediation bioreactor and a method integrating devices such as spiral stirring, liquid high-pressure spraying, shock excitation solid-liquid separation, aerobic aeration, real-time monitoring and the like.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a spiral stirring type bioreactor for repairing organic contaminated soil is composed of a reactor tank body, a blower, a biological cleaning liquid storage tank and a bacterial liquid storage tank.
Further, the reactor jar body is the horizontal sealed jar body, and the external side parcel of jar has the heat preservation, and soil feed inlet, gas vent, monitoring mouth have been seted up in proper order to reactor jar body top, and feed inlet externally mounted has sealed lid, and internally mounted has 5cm x 5cm grid sieve, and the gas vent is connected with active carbon adsorption device, the internal portion of reactor jar is from last to being equipped with liquid spray set, controlling to revolve to spiral agitating unit, excitation solid-liquid separation equipment, header tank down in proper order.
Furthermore, an online monitoring system is arranged on the monitoring port, and the online monitoring system comprises a temperature probe, a pH probe and an oxygen content probe.
Furthermore, the spraying device is provided with a plurality of liquid supply pipes along the axial direction of the top of the tank body, the liquid supply pipes are provided with flow meters and high-pressure nozzles, and the liquid supply pipes are connected with a biological cleaning liquid storage tank and a bacterial liquid storage tank outside the tank body.
Further, the left-right rotation direction spiral stirring device consists of a spiral shaft, a bearing device and a spiral blade, wherein the rotation speed and the rotation direction of the spiral shaft are controlled by a driving device outside the tank body, and the rotation speed reaches 100-150r/mi n.
Furthermore, the excitation solid-liquid separation device consists of an excitation solid-liquid separation screen and a vibration device, wherein the aperture of the screen is 0.1mm, and the excitation frequency is 2 multiplied by 0.4-2 multiplied by 1.5 kW.
A method for repairing organic contaminated soil by using the bioreactor comprises the following steps: (1) putting the polluted soil into the reactor tank body from the feeding hole, closing the sealing cover after the feeding is finished, and spraying biological cleaning liquid and bacterial liquid which are 2-3 times of the mass volume of the soil into the tank body through a spraying device;
(2) driving a left-right rotation direction spiral stirring device to mix the polluted soil and the liquid into slurry, and ensuring the full contact of the polluted soil, the biological cleaning liquid and the bacterial liquid;
(3) starting an aeration device at the bottom of the water collecting tank, improving the air condition in the reactor and ensuring that the oxygen content is not lower than 1.5 mg/L;
(4) after synchronous stirring and aeration are carried out for a certain time, the spiral stirring device is closed, and the excitation solid-liquid separation device is opened, so that water and soil are separated, and the treatment of the polluted soil is completed.
Further, in the step (1), the content of the biosurfactant in the biological cleaning solution is 1-4% (v/v).
Further, the addition amount of the bacterial liquid is (3-5.5) multiplied by 107The volume and mass of the added bacterial liquid of each strain per kilogram of soil are 0.5-1L/m3Soil, the nutrient solution used to prepare the bacterial solution was C: N: P: 100:10: 1.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) the reactor is a horizontal sealed tank body, the double effects of uniformly mixing, stirring and pushing and discharging are achieved by utilizing the bidirectional shearing force action of left and right spiral directions, the soil, biological cleaning liquid and bacterial liquid are highly mixed, the mass transfer effect is good, and the reaction is thorough, so that the liquid consumption is reduced, and the subsequent sewage treatment load is reduced;
(2) the shock excitation solid-liquid separation device embedded in the reactor is matched with an integrated vibration damping design, so that soil particles with the particle size of less than 0.1mm can be effectively separated, the shock excitation frequency can be adjusted according to the soil property, the solid-liquid separation efficiency is high, and the batch processing efficiency of the bioreactor is obviously improved;
(3) the repairing method utilizes the solubilization and elution effect of the biosurfactant on hydrophobic organic pollutants to change the occurrence form of the organic pollutants; the aerobic degradation of the microorganism is combined, aeration is carried out synchronously during cleaning, the environmental condition for the survival of the microorganism is effectively improved, the removal effect of organic pollutants is obviously improved, and the method is particularly suitable for treating the medium-high concentration and refractory organic polluted soil.
Drawings
FIG. 1 is a schematic sectional view showing the structure of a horizontal spiral agitation type bioreactor of the present invention.
Fig. 2 is a top view of the present invention.
In the figure: a reactor tank 1; a base support 101; a damper spring 102; a feed inlet 103; a sealing cover 104; a mesh screen 105; an exhaust port 106; an activated carbon adsorption device 107; a spray device 108; a flow meter 109; a liquid level gauge 110; a temperature probe 111; a pH probe 112; an oxygen content probe 113; a drive device 114; a left-right rotation direction spiral stirring device 115; a vibration motor 116; exciting a solid-liquid separation screen 117; a discharge port 118; a water collection tank 119; an aeration device 120; a water outlet pipe 121; a blower 2; a biological cleaning solution storage tank 3; and a bacteria liquid storage tank 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
As shown in fig. 1, a spiral agitation type bioreactor for remediating organically-polluted soil includes: a reactor tank 1; a base support 101; a liquid spray device 108; a left-right rotation direction spiral stirring device 115; exciting a solid-liquid separation screen 117; a water collection tank 119; a blower 2; a biological cleaning solution storage tank 3; a bacteria liquid storage tank 4 and the like.
The reactor tank body 1 is a horizontal sealed tank body, the outer side of the reactor tank body 1 is wrapped by a heat insulation layer, the top of the reactor tank body 1 is sequentially provided with a soil feeding hole 103, an exhaust hole 106 and a monitoring hole, a sealing cover 104 is arranged outside the feeding hole 103, a 5cm multiplied by 5cm grid sieve is arranged inside the feeding hole 103, the exhaust hole 106 is connected with an activated carbon adsorption device 107, and a liquid spraying device 108, a left-right rotating spiral stirring device 115, an excitation solid-liquid separation device 117 and a water collecting tank 119 are sequentially arranged inside the reactor tank body 1 from top to bottom; an online monitoring system is arranged on the monitoring port, and comprises a temperature probe 111, a pH probe 112 and an oxygen content probe 113; a plurality of liquid supply pipes are axially arranged on the spraying device 108 along the top of the tank body, flow meters 109 and high-pressure nozzles are arranged on the liquid supply pipes, and the liquid supply pipes are connected with a biological cleaning liquid storage tank 3 and a bacterial liquid storage tank 4 outside the tank body; the left-right rotation direction spiral stirring device 115 consists of a spiral shaft, a bearing device and spiral blades, wherein the rotation speed and the rotation direction of the spiral shaft are controlled by a driving device outside the tank body, and the rotation speed reaches 100-150 r/min; the excitation solid-liquid separation device 117 consists of an excitation solid-liquid separation screen and a vibration device, wherein the aperture of the screen is 0.1mm, and the excitation frequency is 2 multiplied by 0.4-2 multiplied by 1.5 kW.
When the device is used, soil is put into the reactor tank body 1 from the feeding hole 103, the sealing cover 104 is closed after the feeding is finished, and the liquid spraying device 108 and the driving device 114 are simultaneously opened. The soil is conveyed along the screw shaft in the direction of the discharge port 118 by the alternating action of the left and right handed screw agitator 115. Synchronously, biological cleaning liquid and bacterial liquid which are 2 to 3 times of the mass volume of the soil are sprayed into the tank body step by step under the control of a flowmeter 109 of a liquid supply pipe of a spraying device 108. When the volume of liquid and soil reaches the level controlled by level gauge 110, spray assembly 108 is turned off. The temperature of the mixture is controlled to be 25-35 ℃ by the temperature probe 111 and the pH probe 112, and the pH is controlled to be 6.5-7.5. The rotation direction of the left-right spiral stirring device 115 is adjusted, so that materials are conveyed backwards by the left spiral when the materials are conveyed forwards by the right spiral, and the uniform mixing of soil, biological cleaning liquid and bacteria liquid is ensured. The aeration device 120 at the bottom of the water collecting tank 119 is opened to improve the air condition inside the reactor and ensure that the oxygen content is not lower than 1.5 mg/L. The exhaust gas generated in the tank body is discharged through an exhaust port 106 and treated by an activated carbon adsorption device 107. At this time, soil particles smaller than 0.1mm and part of liquid can fall into the water collecting tank through the excitation solid-liquid separation screen 117, and soil particles larger than 0.1mm are continuously stirred in the reactor tank 1. After stirring for a certain period of time, the driving device 114 and the aeration device 120 are turned off, and the vibrating device 116 and the exciting solid-liquid separation screen 117 are turned on to dehydrate. After a certain time of dehydration, the vibrating device 117 is closed, the left-right spiral stirring device 115 is started, and the dehydrated soil particles are pushed forward under the action of the double-shaft spiral and are discharged through the discharge port 118. The waste liquid and soil particles smaller than 0.1mm in the water collecting tank 119 are discharged by the water outlet pipe 121.
Example 1
When the polychlorinated biphenyl polluted soil is treated, 4m of polychlorinated biphenyl is thrown into the tank body through the feed inlet3And (3) polluting soil, simultaneously spraying a biosurfactant with the concentration of 4% (v/v) by a liquid spraying device according to the liquid-solid ratio of 3:1, diluting the polluted soil to slurry with a certain concentration, and adjusting the pH value to 6.5. Starting the left-right rotation direction spiral stirring device and the aeration device, controlling the stirring speed at 150r/min, the slurry temperature at 30 ℃ and the air flow rate at 0.5m3H is used as the reference value. Stirring for 10min to make the surfactant fully contact with the soilAnd the catalyst promotes the transfer of the pollutants into a liquid phase, and prepares for the efficient and rapid degradation of the pollutants at the early stage. Starting the liquid spraying device according to the ratio of 5.5 multiplied by 107Adding bacterial liquid into each strain/kg of soil, wherein the adding volume and mass of the bacterial liquid are 1L/m3And (3) soil, namely nutrient substances C, N, P, 100, 10 and 1 in the bacterial liquid. Stirring and aerating are carried out continuously, the pH, temperature and oxygen content indexes in the reactor tank body are observed by using an online monitoring system, and waste gas generated in the reactor tank body is discharged from an exhaust port and is treated by an activated carbon adsorption device. After 15min, the spiral stirring device is closed, the vibration excitation solid-liquid separation device is started, and the cleaning liquid and the soil particles with the particle size smaller than 0.1mm are separated. And after dewatering for 5min, closing the vibration excitation solid-liquid separation device, opening the spiral stirring device, and discharging the soil from the discharge hole. The waste liquid and the sludge in the water collecting tank are discharged from the water discharging port. The soil before and after the treatment is detected, and the result shows that when the treatment time is 30min, the average initial content of the polychlorinated biphenyl is reduced from 3900mg/kg to 1227.4mg/kg, the removal rate is 68.5%, and the water content of discharged materials is about 32.5%.
Example 2
When the phthalate polluted soil is treated, 4m is put into the tank body3And (3) spraying a biosurfactant with the concentration of 1% (v/v) according to the liquid-solid ratio of 2:1 to the polluted soil, diluting the polluted soil to slurry with a certain concentration, and adjusting the pH to 7.1. Starting the left-right rotation direction spiral stirring device and the aeration device, controlling the stirring speed at 100r/min, the slurry temperature at 25 ℃ and the air flow rate at 0.1m3H is used as the reference value. Stirring for 5min to make the surfactant fully contact with soil and promote the transfer of pollutant to liquid phase. Opening the liquid spray device according to a 3 x 107Adding bacterial strain/kg soil into bacterial liquid, wherein the adding volume and mass of the bacterial liquid are 0.5L/m3And (3) soil, namely nutrient substances C, N, P, 100, 10 and 1 in the bacterial liquid. Stirring and aerating are carried out continuously, the pH, temperature and oxygen content indexes in the reactor tank body are observed by using an online monitoring system, and waste gas generated in the reactor tank body is discharged from an exhaust port and is treated by an activated carbon adsorption device. After 15min, the spiral stirring device is closed, the vibration excitation solid-liquid separation device is started, and the cleaning liquid and the soil particles with the particle size smaller than 0.1mm are separated. After dewatering for 3min, closing the exciting solid-liquid separation device, and starting the spiral stirringThe soil is discharged from the discharge hole. The waste liquid and the sludge in the water collecting tank are discharged from the water discharging port. The detection of the soil before and after the treatment shows that when the treatment time is 28min, the average initial content of the phthalate ester is reduced from 2240mg/kg to 405.5mg/kg, the removal rate is 81.8%, and the water content of the discharged material is about 35.8%.
Example 3
When the soil with petroleum hydrocarbon and polycyclic aromatic hydrocarbon combined pollution is treated, 4m of soil is thrown into the tank body3And (3) spraying a biosurfactant with the concentration of 2% (v/v) on the polluted soil according to the liquid-solid ratio of 3:1, diluting the polluted soil to slurry with a certain concentration, and adjusting the pH to 7.5. Starting the left-right rotation direction spiral stirring device and the aeration device, controlling the stirring speed at 120r/min, the slurry temperature at 28 ℃ and the air flow rate at 0.3m3H is used as the reference value. Stirring for 10min to make the surfactant fully contact with soil and promote the transfer of pollutant to liquid phase. Starting a liquid spraying device, adding bacterial liquid into soil according to the ratio of 4 multiplied by 107 bacterial strains/kg, wherein the adding volume and mass of the bacterial liquid are 0.8L/m3 soil, and the ratio of nutrients C to N to P in the bacterial liquid is 100 to 10 to 1. Stirring and aerating are carried out continuously, the pH, temperature and oxygen content indexes in the reactor tank body are observed by using an online monitoring system, and waste gas generated in the reactor tank body is discharged from an exhaust port and is treated by an activated carbon adsorption device. After 20min, the spiral stirring device is closed, the vibration excitation solid-liquid separation device is started, and the cleaning liquid and the soil particles with the particle size smaller than 0.1mm are separated. And after dewatering for 5min, closing the vibration excitation solid-liquid separation device, opening the spiral stirring device, and discharging the soil from the discharge hole. The waste liquid and the sludge in the water collecting tank are discharged from the water discharging port. The detection of the soil before and after treatment shows that when the treatment time is 35min, the initial content of petroleum hydrocarbon and polycyclic aromatic hydrocarbon is respectively reduced from 14400mg/kg and 7855mg/kg to 2835.5mg/kg and 1027.2mg/kg, the removal rates are respectively 80.3 percent and 86.9 percent, and the water content of discharged materials is about 28.3 percent.
According to the bioreactor and the method, under the condition of the liquid-solid ratio of (2-3): 1, the removal rate of organic pollutants in high-concentration and difficult-to-degrade soil is higher and is more than 60%, and the removal rate is single-batch (4 m)3Soil) for 25-30 min, and the discharged water content is 28%35 percent, high treatment efficiency and good dehydration effect.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (9)
1. A spiral stirring type bioreactor for repairing organic contaminated soil is characterized by comprising a reactor tank body, a blower, a biological cleaning liquid storage tank and a bacterial liquid storage tank.
2. The spiral stirring type bioreactor for remediating organically-polluted soil as claimed in claim 1, wherein the reactor tank is a horizontal sealed tank, the outside of the tank is wrapped with a heat insulating layer, the top of the reactor tank is sequentially provided with a soil feed port, an exhaust port and a monitoring port, a sealing cover is mounted outside the feed port, a 5cm x 5cm mesh sieve is mounted inside the feed port, the exhaust port is connected with an activated carbon adsorption device, and the inside of the reactor tank is sequentially provided with a liquid spraying device, a left-right spiral stirring device, a shock excitation solid-liquid separation device and a water collecting tank from top to bottom.
3. The spiral stirring type bioreactor for remediating organically-polluted soil as claimed in claim 2, wherein the monitoring port is provided with an on-line monitoring system, and the on-line monitoring system comprises a temperature probe, a pH probe and an oxygen content probe.
4. The spiral stirring type bioreactor for remediating organically-polluted soil as claimed in claim 2, wherein the spraying device is provided with a plurality of liquid supply pipes along the top axial direction of the tank body, the liquid supply pipes are provided with flow meters and high-pressure nozzles, and the liquid supply pipes are connected with a biological cleaning liquid storage tank and a bacteria liquid storage tank outside the tank body.
5. The spiral stirring type bioreactor for remediating organically-polluted soil as claimed in claim 2, wherein the left-right-handed spiral stirring device is composed of a spiral shaft, a bearing device and a spiral blade, wherein the rotation speed and the rotation direction of the spiral shaft are controlled by a driving device outside the tank body, and the rotation speed reaches 100-150 r/min.
6. The spiral stirring type bioreactor for remediating organically-polluted soil as set forth in claim 2, wherein the vibration-exciting solid-liquid separation device comprises a vibration-exciting solid-liquid separation screen and a vibration device, the screen has a hole diameter of 0.1mm and a vibration-exciting frequency of 2 x 0.4 to 2 x 1.5 kW.
7. A method for remediating organically-contaminated soil using the bioreactor as set forth in claims 1 to 6, comprising the steps of:
(1) putting the polluted soil into the reactor tank body from the feeding hole, closing the sealing cover after the feeding is finished, and spraying biological cleaning liquid and bacterial liquid which are 2-3 times of the mass volume of the soil into the tank body through a spraying device;
(2) driving a left-right rotation direction spiral stirring device to mix the polluted soil and the liquid into slurry, and ensuring the full contact of the polluted soil, the biological cleaning liquid and the bacterial liquid;
(3) starting an aeration device at the bottom of the water collecting tank, improving the air condition in the reactor and ensuring that the oxygen content is not lower than 1.5 mg/L;
(4) after synchronous stirring and aeration are carried out for a certain time, the spiral stirring device is closed, and the excitation solid-liquid separation device is opened, so that water and soil are separated, and the treatment of the polluted soil is completed.
8. The method for remediating organically-polluted soil using the bioreactor as defined in claim 1 to 6, as defined in claim 7, wherein the biosurfactant content in the biological cleaning solution in step (1) is 1 to 4% (v/v).
9. The method of claim 7The method for remedying the organic contaminated soil by using the bioreactor as claimed in claims 1 to 6, wherein the addition amount of the bacterial liquid is (3-5.5) x 107The volume and mass of the added bacterial liquid of each strain per kilogram of soil are 0.5-1L/m3Soil, the nutrient solution used to prepare the bacterial solution was C: N: P: 100:10: 1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115055504A (en) * | 2022-06-29 | 2022-09-16 | 煜环环境科技有限公司 | Microbial leaching reaction device and soil remediation method |
| CN115318818A (en) * | 2022-07-15 | 2022-11-11 | 上海化工院环境工程有限公司 | Multifunctional multi-mode integrated soil ex-situ remediation system and method |
-
2020
- 2020-10-20 CN CN202011122105.6A patent/CN112404121A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115055504A (en) * | 2022-06-29 | 2022-09-16 | 煜环环境科技有限公司 | Microbial leaching reaction device and soil remediation method |
| CN115055504B (en) * | 2022-06-29 | 2023-06-16 | 煜环环境科技有限公司 | Microorganism leaching reaction device and soil restoration method |
| CN115318818A (en) * | 2022-07-15 | 2022-11-11 | 上海化工院环境工程有限公司 | Multifunctional multi-mode integrated soil ex-situ remediation system and method |
| CN115318818B (en) * | 2022-07-15 | 2024-03-26 | 上海化工院环境工程有限公司 | Multifunctional multi-mode integrated soil ex-situ remediation system and method |
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