CN106219746B - Device and method for cooperatively strengthening sewage treatment by combining calcium chloride and magnetic field at low temperature - Google Patents
Device and method for cooperatively strengthening sewage treatment by combining calcium chloride and magnetic field at low temperature Download PDFInfo
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- CN106219746B CN106219746B CN201610902199.6A CN201610902199A CN106219746B CN 106219746 B CN106219746 B CN 106219746B CN 201610902199 A CN201610902199 A CN 201610902199A CN 106219746 B CN106219746 B CN 106219746B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/342—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the enzymes used
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a device and a method for cooperatively strengthening sewage treatment by combining calcium chloride and a magnetic field at low temperature, belonging to the technical field of domestic sewage purification. The device comprises a reactor, the reactor is a calcium chloride and magnetic field cooperative reinforcement activated sludge reactor, a water inlet is arranged at the upper part of the reactor, one end of a water inlet header pipe extends into the reactor through the water inlet, and the other end of the water inlet header pipe is respectively connected with a sewage input pipe and CaCl2The solution input pipe is connected with the CaCl through a sewage input pipe2The solution input pipe respectively introduces domestic sewage and CaCl into the reactor2Solution, and an aeration device and a magnetic field strengthening device are also arranged in the reactor. The invention can effectively solve the defects of low organic matter degradation efficiency and high residual activated sludge yield of the reactor in the existing low-temperature domestic sewage treatment.
Description
Technical Field
The invention belongs to the technical field of domestic sewage purification, and particularly relates to a device and a method for cooperatively strengthening sewage treatment by combining calcium chloride and a magnetic field at low temperature, which are mainly suitable for the biological strengthening treatment of domestic sewage at low temperature.
Background
The low temperature in the sewage treatment system means the temperature of less than 15 ℃, the time of the sewage temperature of less than 10 ℃ can reach 6 months in northern areas of China. The data of the annual book of the Chinese environmental statistics show that the total wastewater discharge amount of China in 2015 reaches 7161751 ten thousand tons, wherein the total wastewater discharge amount of the northern area is 2653582 ten thousand tons and accounts for 37.05 percent of the total wastewater discharge amount. The activated sludge process is an aerobic biological sewage treatment technology which is most widely applied at present, and accounts for more than 90 percent of the urban sewage treatment process and about 50 percent of the industrial wastewater treatment process. But the activity of the active sludge microorganisms is obviously reduced under the condition of low temperature, which is particularly shown in that the quality of effluent is reduced, the respiration rate is reduced, the mass transfer capacity of cell membranes is reduced, the activity of dehydrogenase is reduced, the yield of residual active sludge is increased, and the like. Therefore, the key to solving the problem of the field of environmental water treatment in northern areas of China is to improve the activity of active sludge microorganisms at low temperature.
At present, the method for strengthening the treatment effect of the activated sludge method under the low temperature condition mainly comprises the steps of changing the operation process, adjusting the operation parameters, adjusting the quality of inlet water, physically strengthening, adding additives, high-efficiency cold-resistant strains and the like. However, these methods have their own limitations, and most of them are aimed only at improving the effluent quality, and have less attention to the problem of increase in the yield of excess activated sludge, and thus cannot effectively solve the problems of decrease in the effluent quality and increase in the yield of excess activated sludge encountered in the winter season in the activated sludge process at the same time. Meanwhile, the sewage treatment process and the engineering design parameters under the low-temperature condition are different from those under the normal-temperature condition greatly. In addition, with the continuous improvement of sewage treatment standards, the treatment effect of the method on domestic sewage under low temperature conditions cannot well meet the standard requirements.
Based on the above problems, the inventors have also made various studies to enhance the treatment effect of the activated sludge process under low temperature conditions, and have achieved certain results. For example, the invention patent with application number 201210475425.9, which is applied by the applicant at 11/22/2012, discloses an apparatus for sewage enhanced treatment by using a constant magnetic field and a sewage treatment method thereof, wherein the sewage treatment method of the application comprises the following steps: (1) filling activated sludge in a reactor filled with magnetic powder, arranging iron plates on two sides, and arranging iron plates on the periphery; (2) domesticating the sludge at low temperature, gradually increasing the organic load of the inlet water, and aerating and stirring the activated sludge; (3) turning the magnet direction, and domesticating until the removal rate of COD reaches more than 80%; (4) the direction of the magnet is continuously turned in the running process to form a magnetic field-microorganism strengthening system. The method of the application is simple to operate, and can improve the effluent quality of the activated sludge process under the low-temperature condition to a certain extent.
For another example, the invention patent with application number 201210475408.5, which is applied by the applicant at 11/22/2012, discloses an apparatus for performing sewage enhanced treatment by using a variable magnetic field and a sewage treatment method thereof, and the application specifically includes the following steps: (1) installing a magnetic field strengthening device at the periphery of the reactor; (2) inoculating activated sludge, filling magnetic powder in a reactor, aerating and stirring the activated sludge, and performing sludge acclimation of low-concentration organic load; (3) gradually increasing the organic load of the inlet water, and continuously changing the magnetic field intensity to carry out low-temperature-magnetic field synchronous domestication; (4) after reaching a stable state, controlling the organic load to form a magnetic field-magnetic powder-microorganism strengthening system. The method is simple to operate, can improve the removal rate of organic matters and the mass transfer rate in the reactor, improve the organic load, shorten the retention time of sewage and reduce the cost.
Compared with the anaerobic activated sludge method, the aerobic activated sludge method is a process with higher residual activated sludge yield. When the sewage treatment plant runs in winter, the concentration of suspended solids is kept unchanged, and the sludge age is shortened; the sludge age is kept unchanged, and the concentration of suspended solids is increased. Although the above two applications utilize the magnetic field to improve the degradation performance of sewage, the problem of the increase of the yield of residual activated sludge at low temperature is not considered well and cannot be solved effectively.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects that when the existing activated sludge method is adopted to treat sewage at low temperature, the quality of effluent water is reduced and cannot reach the standard, the yield of residual activated sludge is increased, and the treatment effect cannot meet the standard requirement, and provides a device and a method for cooperatively strengthening sewage treatment by using calcium chloride and a magnetic field at low temperature. The invention adopts a magnetic field-calcium ion-microorganism strengthening system, utilizes calcium ions to enhance the activity of activated sludge dehydrogenase, simultaneously utilizes a magnetic field to increase the mass transfer efficiency of microbial cell membranes, can simultaneously and effectively solve the problems of water quality reduction of effluent and yield increase of residual activated sludge in the existing low-temperature domestic sewage treatment, and ensures the treatment effect of the activated sludge method under the low-temperature condition.
2. Technical scheme
The principle of the invention is as follows: in a magnetic field-calcium ion-microorganism strengthening system, the magnetic field changes the composition of phospholipid fatty acid of an activated sludge microorganism cell membrane, the content of unsaturated fatty acid is increased, the permeability of the cell membrane is improved, the mass transfer rate is improved, and small molecules can enter cells easily to be decomposed; the calcium ions improve the activities of enzymes such as dehydrogenase, protease, lipase and the like by changing the strong charge distribution of enzyme catalysis, and enhance the capability of activated sludge microorganisms in degrading solid macromolecular organic matters, thereby reducing the yield of residual activated sludge. The invention combines two technologies in a reactor, the optimal combination is 10-30mT magnetic field and 0.01-0.1mM calcium ion concentration, so that the two have good coordination effect, thereby simultaneously improving the degradation capability of the activated sludge on organic matters under low temperature and reducing the yield of the residual activated sludge.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a device for cooperatively strengthening sewage treatment by combining calcium chloride and a magnetic field at low temperature, which comprises a reactor, wherein the reactor is a calcium chloride and magnetic field cooperatively strengthened activated sludge reactor, activated sludge is filled in the reactor, the upper part of the reactor is provided with a water inlet, one end of a water inlet main pipe extends into the reactor through the water inlet, and the other end of the water inlet main pipe is respectively connected with a sewage input pipe and CaCl2The solution input pipe is connected with the CaCl through a sewage input pipe2The solution input pipe respectively introduces domestic sewage and CaCl into the reactor2Solution, and an aeration device and a magnetic field strengthening device are also arranged in the reactor.
Furthermore, the magnetic field strengthening device comprises a power supply, a transformer and an electromagnetic coil, wherein the electromagnetic coil is connected with the transformer, and the electromagnetic coil is a spiral coil and surrounds the outside of the water inlet main pipe.
Furthermore, the inner side and the outer side of the electromagnetic coil are respectively provided with a bracket which is made of a non-metal heat-resistant material, and the outside of the reactor is provided with an iron plate cover.
Furthermore, the magnetic field strengthening device also comprises a magnetic field measuring instrument which is positioned inside the reactor.
Furthermore, a first water pump and CaCl are arranged on the sewage input pipe2The solution input pipe is provided with a second water pump.
Furthermore, a stirring device is arranged in the reactor, a stirring blade of the stirring device is positioned below the aeration device, and a stirring shaft of the stirring device penetrates through the water inlet main pipe to enter the reactor.
Furthermore, a water outlet is arranged on the side wall of the reactor, and a sludge discharge port is arranged at the bottom of the reactor.
Furthermore, the water inlet main pipe and the magnetic field strengthening device are both arranged along the axial center of the reactor in the longitudinal direction.
The invention relates to a method for cooperatively strengthening sewage treatment by combining calcium chloride and a magnetic field at low temperature, which comprises the following steps:
firstly, activated sludge is inscribed into a reactor under the low temperature condition of 4-15 ℃, the sludge concentration is 3500-3D) simulating domestic sewage, and carrying out aeration and stirring treatment to enable the activated sludge to be in a completely mixed state;
step two, after the activated sludge is acclimated for 18-22 days, the power supply is switched on, a magnetic field is formed in the reactor through a magnetic field strengthening device, and CaCl is added2CaCl is added into the reactor through a solution input pipe2The activated sludge reactor reinforced by the cooperation of calcium chloride and a magnetic field is constructed by the solution, the concentration of calcium ions in the reactor and the size of the magnetic field are controlled by adjusting a second water pump and a transformer, and simultaneously, the organic load of inlet water is increased to 0.4 kg/(m)3D) performing synchronous acclimation of the magnetic field intensity and the calcium ion concentration on the sludge in the reactor;
step three, after the activated sludge is acclimated for 35-45 days, adding actual domestic sewage for treatment, and gradually increasing the organic load of inlet water to 0.4-1 kg/(m)3D) and gradually reducing the simulated domestic sewage to no addition, after reaching a steady state (COD removal rate)>80%) to form a magnetic field-calcium ion-microorganism strengthening system.
Furthermore, the concentration of calcium ions is 0.01-0.1mM and the intensity of the magnetic field is 10-30mT after the calcium chloride solution is mixed with the domestic sewage in the second step.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the device for cooperatively strengthening sewage treatment by combining calcium chloride and magnetic field at low temperature utilizes CaCl2The solution input pipe introduces CaCl into the reactor2The solution generates a magnetic field in the reactor through the magnetic field strengthening device, so that an aerobic activated sludge reaction system strengthened by the cooperation of calcium chloride and the magnetic field is constructed through the combination of the calcium chloride and the magnetic field, the problems that the effluent water does not reach the standard and the yield of residual activated sludge is increased when sewage is treated by adopting the existing activated sludge method under the low-temperature condition can be effectively solved, and the effect of sewage treatment can be ensured to ensure that the sewage treatment meets the standard requirement.
(2) According to the device for cooperatively strengthening sewage treatment by combining calcium chloride and the magnetic field at low temperature, the electromagnetic coil of the magnetic field strengthening device is a spiral coil and surrounds the outside of the water inlet main pipe, the magnetic field strengthening device can effectively utilize heat generated by the magnetic induction coil to heat winter domestic sewage while providing the magnetic field for the reactor, the magnetic induction coil is more fully utilized, the waste of electric energy of the magnetic field is prevented, the biological activity of microorganisms is further improved, and the sewage treatment effect at low temperature is ensured.
(3) According to the device for cooperatively strengthening sewage treatment by combining calcium chloride and the magnetic field at low temperature, the inner side and the outer side of the electromagnetic coil are respectively provided with the bracket, and the brackets are made of the non-metal heat-resistant material, so that the magnetic field strengthening device can be isolated from water, and the action effect of the magnetic field can be guaranteed. The iron plate cover is arranged outside the reactor, so that the influence of the magnetic field in the reactor on other external equipment can be effectively prevented.
(4) According to the method for cooperatively strengthening sewage treatment by combining calcium chloride and the magnetic field at the low temperature, the activated sludge reaction system cooperatively strengthened by the calcium chloride and the magnetic field is constructed, the concentration of calcium ions in the reactor is controlled to be 0.01-0.1mM, and the strength of the magnetic field is controlled to be 10-30mT, so that the sewage treatment effect is improved to the maximum extent, and the yield of residual activated sludge can be effectively reduced on the basis of remarkably improving the degradation capability of the activated sludge on organic matters under the low-temperature condition.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for sewage treatment using calcium chloride and a magnetic field for synergistic enhancement according to the present invention;
FIG. 2 is a process flow diagram of the method for enhancing sewage treatment by using calcium chloride and magnetic field.
In the figure: 1. a sewage input pipe; 2. a first water pump; 3. a support; 4. a reactor; 5. a water outlet; 6. an electromagnetic coil; 7. an iron plate cover; 8. an aeration device; 9. a stirring device; 10. a sludge discharge port; 11. a second water pump; 12. a magnetic field tester; 13. a transformer; 14. a power source; 15. a calcium chloride water inlet pipe; 16. a water inlet main pipe.
Detailed Description
For a further understanding of the invention, reference will now be made in detail to the embodiments illustrated in the drawings.
Example 1
With reference to fig. 1, the device for cooperatively strengthening sewage treatment at low temperature by using calcium chloride and magnetic field according to the embodiment is established in a sewage treatment plant, and comprises a reactor 4, wherein the reactor 4 is a calcium chloride and magnetic field cooperatively strengthened activated sludge reactor, and the interior of the reactor 4 is filled with activated sludge. A water outlet 5 is arranged on the side wall of the reactor 4, a sludge discharge port 10 is arranged at the bottom of the reactor 4, a water inlet is arranged at the center of the upper part of the reactor 4, one end of a water inlet header pipe 16 extends into the reactor 4 through the water inlet and is longitudinally arranged along the axis of the reactor 4, and the other end of the water inlet header pipe 16 is respectively connected with a sewage input pipe 1 and CaCl2The solution input pipe 15 is connected with CaCl through the sewage input pipe 12The solution input pipe 15 respectively introduces domestic sewage and CaCl into the reactor 42Solution, and a first water pump 2 and CaCl are arranged on the sewage input pipe 12The solution input pipe 15 is provided with a second water pump 11. The reactor 4 of the embodiment is also internally provided with an aeration device 8, a stirring device 9 and a magnetic field intensityAnd (4) a chemical conversion device. The magnetic field strengthening device comprises a power supply 14, a transformer 13, an electromagnetic coil 6 and a magnetic field tester 12, wherein the electromagnetic coil 6 is connected with the transformer 13, and the electromagnetic coil 6 is a spiral coil and surrounds the outside of a water inlet manifold 16.
The effect of the activated sludge process on sewage treatment under low temperature conditions has been a technical problem that researchers in the field want to solve, especially the problem of the reduction of effluent quality and the increase of residual activated sludge yield under low temperature conditions, and the inventors have also been dedicated to the research work in this respect. Although the existing research has achieved certain effect in the aspect of improving the quality of the effluent water of the activated sludge process under the low temperature condition, the problem of increasing the yield of the residual activated sludge is not solved well all the time. For example, in patents whose application numbers are 201210475425.9 and 201210475408.5, which were filed by the inventor in 2012, the two patents can significantly improve the degradation performance of sewage to some extent through the establishment of a magnetic field-microorganism strengthening system or a magnetic field-magnetic powder-microorganism strengthening system, but the inventor finds in the experimental process that the yield of residual activated sludge is still high when sewage is treated under low temperature conditions by using the two technical schemes, and the treatment effect of the residual activated sludge on the domestic sewage still needs to be further improved. Therefore, how to effectively reduce the yield of the excess activated sludge on the basis of ensuring the quality of the effluent of the activated sludge process under the low-temperature condition is the biggest problem which troubles the inventor.
The inventor finally obtains the technical scheme of the embodiment by long-term large-scale experimental research and combining the reaction mechanism of the activated sludge process, namely, the aerobic activated sludge reaction system reinforced by the cooperation of calcium chloride and a magnetic field is established by the combination of calcium chloride, the magnetic field and activated sludge, so that the problems that the effluent water does not reach the standard and the yield of the residual activated sludge is increased when the sewage is treated by adopting the existing activated sludge process under the low-temperature condition can be effectively solved, and the sewage treatment effect can be ensured to meet the standard requirement. Wherein, the magnetic field changes the composition of phospholipid fatty acid of the activated sludge microbial cell membrane, the content of unsaturated fatty acid is increased, the permeability of the cell membrane is improved, the mass transfer rate is improved, and small molecules are easier to enter cells for decomposition; the calcium ions improve the activities of enzymes such as dehydrogenase, protease, lipase and the like by changing the strong charge distribution of enzyme catalysis, and enhance the capability of activated sludge microorganisms in degrading solid macromolecular organic matters, thereby reducing the yield of residual activated sludge. In this embodiment, the electromagnetic coil of the magnetic field enhancement device is longitudinally arranged along the central axis of the reactor 4, and the magnetic field enhancement device can provide a magnetic field for the reactor and simultaneously effectively utilize heat generated by the magnetic induction coil to heat the domestic sewage in winter to a certain extent, thereby further improving the biological activity of microorganisms and ensuring the sewage treatment effect at low temperature.
The inside and outside both sides of solenoid 6 of this embodiment all are equipped with support 3, and this support 3 is made by nonmetal heat-resistant material (require to have certain intensity and high temperature resistant), adopts the plastic support in this embodiment to can strengthen device and water to the magnetic field and keep apart, be favorable to guaranteeing the effect in magnetic field. The above-mentioned magnetometer 12 is located inside the reactor 4 so as to detect the magnitude of the magnetic field in the reactor 4 in real time, and in this embodiment, the magnetometer 12 is placed at a depth 1/2 from the axis 1/2 of the reactor 4. The reactor 4 is also provided with an iron plate cover 7 outside, so that the influence of the magnetic field in the reactor 4 on other external equipment can be effectively prevented. The stirring blades of the stirring device 9 are positioned below the aeration device 8, and the stirring shaft of the stirring device passes through the water inlet main pipe 16 and enters the interior of the reactor 4.
The method for cooperatively strengthening sewage treatment by combining calcium chloride and a magnetic field at low temperature of the embodiment has the process flow as shown in fig. 2, and comprises the following specific steps:
firstly, activated sludge is connected into a reactor 4 under the condition of low temperature of 5 ℃, the concentration of the sludge is 4000 mg/L, and the organic load of water fed into the reactor 4 through a sewage input pipe 1 is 0.2 kg/(m)3D) the simulated domestic sewage is subjected to aeration and agitation treatment by the aeration device 8 and the agitation device 9, respectively, so as to achieve a completely mixed state of the activated sludge;
step two, after 20 days of acclimation of the activated sludge, connecting a power supply 14, forming a magnetic field in the reactor 4 through a magnetic field strengthening device, and passing CaCl2Transfusion of solutionA pipe 15 feeds CaCl into the reactor 42The activated sludge reactor reinforced by the cooperation of calcium chloride and a magnetic field is constructed, the concentration of calcium ions in the reactor 4 is controlled to be 0.01 mM by adjusting a second water pump 11 and a transformer 13, the strength of the magnetic field is 30mT, and simultaneously the organic load of inlet water is increased to 0.4 kg/(m & lt/m & gt)3D) simultaneous acclimation of the magnetic field strength and calcium ion concentration of the sludge in the reactor 4;
step three, after the activated sludge is acclimated for 40 days, adding actual domestic sewage for treatment, and gradually increasing the organic load of inlet water to 0.4 kg/(m)3D) and gradually reducing the simulated domestic sewage to no addition, after reaching a steady state (COD removal rate)>80%) to form a magnetic field-calcium ion-microorganism strengthening system.
In this embodiment, the construction of the activated sludge reaction system cooperatively enhanced by calcium chloride and a magnetic field is beneficial to the improvement of the effluent quality of the activated sludge process and the reduction of the yield of the residual activated sludge under the low-temperature condition, and meanwhile, the inventor carries out optimization design on the concentration of calcium ions and the strength of the magnetic field through a large number of experimental studies, and finally finds that the combination effect is optimal when the concentration of the calcium ions is 0.01-0.1mM and the strength of the magnetic field is 10-30mT, so that the sewage treatment effect can be improved to the maximum extent, and the effluent quality and the yield of the residual activated sludge can both meet the standard requirements. In addition, the inventor also carries out optimization design on the specific operation process of the sewage treatment method of the embodiment, and further ensures the sewage treatment effect under the low-temperature condition by carrying out synchronous domestication treatment on the magnetic field intensity and the calcium ion concentration and carrying out optimization design on the numerical values of all process parameters.
Example 2
The sewage treatment apparatus of this embodiment 2 is similar to that of embodiment 1, and when the sewage treatment apparatus is used to treat sewage, the specific operation is basically the same as that of embodiment 1, and the differences are mainly that: in this example, the magnetic field strength was controlled to 10mT, and the calcium ion concentration was controlled to 0.01 mM.
Firstly, activated sludge is inscribed into a reactor 4 at the low temperature of 10 ℃, the concentration of the sludge is 3500mg/L, and water is organically fed into the reactor 4 through a sewage input pipe 1The load was 0.2 kg/(m)3D) the simulated domestic sewage is subjected to aeration and agitation treatment by the aeration device 8 and the agitation device 9, respectively, so as to achieve a completely mixed state of the activated sludge;
step two, after the activated sludge is acclimated for 18 days, the power supply 14 is switched on, a magnetic field is formed in the reactor 4 through a magnetic field strengthening device, and CaCl is added2The solution input pipe 15 feeds CaCl into the reactor 42The activated sludge reactor reinforced by the cooperation of calcium chloride and a magnetic field is constructed, the concentration of calcium ions in the reactor 4 is controlled to be 0.01 mM by adjusting a second water pump 11 and a transformer 13, the strength of the magnetic field is 10mT, and simultaneously the organic load of inlet water is increased to 0.4 kg/(m & lt/m & gt)3D) simultaneous acclimation of the magnetic field strength and calcium ion concentration of the sludge in the reactor 4;
step three, after the activated sludge is acclimated for 35 days, adding actual domestic sewage for treatment, and gradually increasing the organic load of inlet water to 0.4 kg/(m)3D) and gradually reducing the simulated domestic sewage to no addition, after reaching a steady state (COD removal rate)>80%) to form a magnetic field-calcium ion-microorganism strengthening system.
Comparative example 1
The specific process steps of the activated sludge process for treating sewage of the comparative example are basically the same as those of example 1, and the differences are as follows: in this comparative example, the magnetic field intensity in the reactor was controlled to 0mT, the calcium ion concentration was controlled to 0 mM, and the sludge discharge period was controlled to 7 days.
Comparative example 2
The specific process steps of the activated sludge process for treating sewage of the comparative example are basically the same as those of example 1, and the differences are as follows: in this comparative example, the magnetic field intensity in the reactor was controlled to 0mT and the calcium ion concentration was controlled to 0.1 mM.
Comparative example 3
The specific process steps of the activated sludge process for treating sewage of the comparative example are basically the same as those of example 1, and the differences are as follows: in this comparative example, the magnetic field intensity in the reactor was controlled to 10mT and the calcium ion concentration was controlled to 0 mM.
Comparative example 4
The specific process steps of the activated sludge process for treating sewage of the comparative example are basically the same as those of example 1, and the differences are as follows: in this comparative example, the magnetic field intensity in the reactor was controlled to 10mT and the calcium ion concentration was controlled to 1 mM.
Comparative example 5
The specific process steps of the activated sludge process for treating sewage of the comparative example are basically the same as those of example 1, and the differences are as follows: in this comparative example, the magnetic field intensity in the reactor was controlled to 30mT and the calcium ion concentration was controlled to 1 mM.
When sewage is treated by the methods of the examples and the comparative examples respectively, the effluent COD and the Solid Retention Time (SRT) data are shown in Table 1, and it can be seen from the table that the COD removal rate of the effluent in the comparative example 1 (when no magnetic field effect and calcium ion addition are contained) is 77.5%, the SRT is 18 days, and by adopting the treatment method of the example 1, the reactor with the synergistic enhancement of calcium chloride and the magnetic field can operate well under the low-temperature condition, the effluent Chemical Oxygen Demand (COD) removal rate reaches 86.5%, the Solid Retention Time (SRT) is 34 days, and the reactor designed according to the example 1 can improve the effluent COD removal rate by 9.0% and simultaneously effectively reduce the yield of the residual activated sludge by 47.1%. By adopting the treatment method of the embodiment 2, the reactor cooperatively enhanced by the calcium chloride and the magnetic field can operate well under the low-temperature condition, the removal rate of Chemical Oxygen Demand (COD) of the effluent reaches 84.3%, the Solid Retention Time (SRT) is 46 days, and the reactor designed according to the embodiment 2 can improve the removal rate of COD of the effluent by 6.8% and reduce the yield of residual activated sludge by 61.1%. It can be seen from the data in the table that when only the magnetic field is added or only the calcium ions are added, the Solid Retention Time (SRT) is short, and the yield of the residual activated sludge is large; when the calcium ion concentration is more than 0.1mM, the yield of the residual activated sludge is still high, and the effluent quality is poor and cannot meet the standard requirement. In conclusion, under the common coordination action of the magnetic field intensity, the calcium ions and the activated sludge, the invention simultaneously carries out optimization design on the magnetic field intensity and the calcium ion concentration, thereby effectively reducing the output of the residual activated sludge under the condition of ensuring the effluent quality and ensuring the sewage treatment effect of the reactor under the low-temperature condition.
TABLE 1 comparison of the operating conditions of examples 1-2 with comparative examples 1-5
Example 3
The sewage treatment apparatus of this embodiment 3 is similar to that of embodiment 1, and when the sewage treatment apparatus is used to treat sewage, the specific operation is basically the same as that of embodiment 1, and the differences are mainly that: in this example, the magnetic field strength was controlled to 20mT, and the calcium ion concentration was controlled to 0.05 mM.
Firstly, activated sludge is connected into a reactor 4 under the low temperature condition of 8 ℃, the sludge concentration is 4500mg/L, and the organic load of water fed into the reactor 4 through a sewage input pipe 1 is 0.2 kg/(m)3D) the simulated domestic sewage is subjected to aeration and agitation treatment by the aeration device 8 and the agitation device 9, respectively, so as to achieve a completely mixed state of the activated sludge;
step two, after the activated sludge is acclimated for 22 days, the power supply 14 is switched on, a magnetic field is formed in the reactor 4 through a magnetic field strengthening device, and CaCl is added2The solution input pipe 15 feeds CaCl into the reactor 42The activated sludge reactor reinforced by the cooperation of calcium chloride and a magnetic field is constructed, the concentration of calcium ions in the reactor 4 is controlled to be 0.05 mM by adjusting a second water pump 11 and a transformer 13, the strength of the magnetic field is controlled to be 20mT, and simultaneously the organic load of inlet water is increased to 0.4 kg/(m & lt/m & gt)3D) simultaneous acclimation of the magnetic field strength and calcium ion concentration of the sludge in the reactor 4;
step three, after the activated sludge is acclimated for 45 days, adding actual domestic sewage for treatment, and gradually increasing the organic load of inlet water to 1 kg/(m)3D) and gradually reducing the simulated domestic sewage to no addition, after reaching a steady state (COD removal rate)>80%) to form a magnetic field-calcium ion-microorganism strengthening system. When the method of the embodiment is adopted to treat sewage, the sewage treatment effect is obviously superior to that of comparative examples 1-5, and the yield of residual activated sludge can be obviously reduced under the condition of ensuring the effluent quality.
Example 4
The sewage treatment apparatus of this embodiment is similar to that of embodiment 1, and when the sewage treatment apparatus is used to treat sewage, the specific operation is basically the same as that of embodiment 1, and the differences are mainly that: in this example, the magnetic field strength was controlled to 20mT, and the calcium ion concentration was controlled to 0.1 mM.
Firstly, activated sludge is inscribed into a reactor 4 at a low temperature of 14 ℃, the concentration of the sludge is 4300 mg/L, and the organic load of water fed into the reactor 4 through a sewage input pipe 1 is 0.2 kg/(m)3D) the simulated domestic sewage is subjected to aeration and agitation treatment by the aeration device 8 and the agitation device 9, respectively, so as to achieve a completely mixed state of the activated sludge;
step two, after 20 days of acclimation of the activated sludge, connecting a power supply 14, forming a magnetic field in the reactor 4 through a magnetic field strengthening device, and passing CaCl2The solution input pipe 15 feeds CaCl into the reactor 42The activated sludge reactor reinforced by the cooperation of calcium chloride and a magnetic field is constructed, the concentration of calcium ions in the reactor 4 is controlled to be 0.1mM by adjusting a second water pump 11 and a transformer 13, the strength of the magnetic field is controlled to be 20mT, and simultaneously the organic load of inlet water is increased to 0.4 kg/(m & lt/m & gt)3D) simultaneous acclimation of the magnetic field strength and calcium ion concentration of the sludge in the reactor 4;
step three, after the activated sludge is acclimated for 43 days, adding actual domestic sewage for treatment, and gradually increasing the organic load of inlet water to 1 kg/(m)3D) and gradually reducing the simulated domestic sewage to no addition, after reaching a steady state (COD removal rate)>80%) to form a magnetic field-calcium ion-microorganism strengthening system. When the method of the embodiment is adopted to treat sewage, the sewage treatment effect is closer to that of the embodiment 4, and the output of the residual activated sludge can be obviously reduced under the condition of ensuring the effluent quality.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (8)
1. The utility model provides a allies oneself with calcium chloride and magnetic field synergy strengthening sewage treatment's device at low temperature, includes reactor (4), its characterized in that: the reactor (4) is a calcium chloride and magnetic field synergistic enhanced activated sludge reactor, activated sludge is filled in the reactor (4), a water inlet is formed in the upper part of the reactor (4), one end of a water inlet header pipe (16) extends into the reactor (4) through the water inlet, and the other end of the water inlet header pipe is respectively connected with a sewage input pipe (1) and CaCl2The solution input pipe (15) is connected with CaCl through the sewage input pipe (1)2The solution input pipe (15) respectively introduces domestic sewage and CaCl into the reactor (4)2The solution, and an aeration device (8) and a magnetic field strengthening device are also arranged in the reactor (4); the magnetic field strengthening device comprises a power supply (14), a transformer (13) and an electromagnetic coil (6), wherein the electromagnetic coil (6) is connected with the transformer (13), and the electromagnetic coil (6) is a spiral coil and surrounds the outside of a water inlet manifold (16).
2. The device for cooperatively strengthening sewage treatment by combining calcium chloride and a magnetic field at low temperature according to claim 1, characterized in that: the inner side and the outer side of the electromagnetic coil (6) are respectively provided with a support (3), the supports (3) are made of non-metal heat-resistant materials, and an iron plate cover (7) is arranged outside the reactor (4).
3. The device for cooperatively strengthening sewage treatment by combining calcium chloride and a magnetic field at low temperature according to claim 1, characterized in that: the magnetic field strengthening device also comprises a magnetic field measuring instrument (12), and the magnetic field measuring instrument (12) is positioned inside the reactor (4).
4. The device for the cooperative enhancement of sewage treatment by combining calcium chloride and a magnetic field at low temperature according to any one of claims 1-3, wherein: the sewage input pipe (1) is provided with a first water pump (2) and CaCl2The solution input pipe (15) is provided with a second water pump (11).
5. The device for the cooperative enhancement of sewage treatment by combining calcium chloride and a magnetic field at low temperature according to any one of claims 1-3, wherein: the reactor (4) is also internally provided with a stirring device (9), the stirring blades of the stirring device (9) are positioned below the aeration device (8), and the stirring shaft of the stirring device passes through the water inlet main pipe (16) and enters the reactor (4).
6. The device for cooperatively strengthening sewage treatment by combining calcium chloride and magnetic field at low temperature according to claim 5, characterized in that: a water outlet (5) is arranged on the side wall of the reactor (4), and a sludge discharge port (10) is arranged at the bottom of the reactor (4).
7. The device for cooperatively strengthening sewage treatment by combining calcium chloride and magnetic field at low temperature according to claim 6, characterized in that: the water inlet header pipe (16) and the magnetic field strengthening device are both arranged along the axial center of the reactor (4) in the longitudinal direction.
8. A method for cooperatively strengthening sewage treatment by combining calcium chloride and a magnetic field at low temperature is characterized by comprising the following steps:
step one, activated sludge is inoculated into a reactor (4) under the low temperature condition of 4-15 ℃, the sludge concentration is 3500-3D) simulating domestic sewage, and carrying out aeration and stirring treatment to enable the activated sludge to be in a completely mixed state;
step two, after the activated sludge is acclimated for 18-22 days, a power supply (14) is switched on, a magnetic field is formed in the reactor through a magnetic field strengthening device, and CaCl is added2A solution input pipe (15) adds CaCl into the reactor (4)2Solution, an activated sludge reactor reinforced by calcium chloride and a magnetic field is constructed, the concentration of calcium ions in the reactor (4) and the size of the magnetic field are controlled by adjusting a second water pump (11) and a transformer (13), and simultaneously, the organic load of inlet water is increased to 0.4 kg/(m & lt/(m & gt)3D) performing synchronous acclimation of the magnetic field strength and the calcium ion concentration on the sludge in the reactor (4); after the calcium chloride solution is mixed with the domestic sewage, the concentration of calcium ions is 0.01-0.1mM, and the strength of a magnetic field is 10-30 mT;
step three, after the activated sludge is acclimated for 35-45 days, adding actual domestic sewage for treatment, and gradually increasing the organic load of inlet water to 0.4-1 kg/(m)3D) and gradually reducing the simulated domestic sewage until no addition is made, and forming a magnetic field-calcium ion-microorganism strengthening system after the stable state is achieved.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102897918A (en) * | 2012-11-22 | 2013-01-30 | 南京大学 | Device for carrying out sewage enhanced treatment by using constant magnetic field and sewage treatment method thereof |
| CN102923866A (en) * | 2012-11-22 | 2013-02-13 | 南京大学 | Device for implementing strengthened treatment for sewage through changing magnetic field and sewage treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102897918A (en) * | 2012-11-22 | 2013-01-30 | 南京大学 | Device for carrying out sewage enhanced treatment by using constant magnetic field and sewage treatment method thereof |
| CN102923866A (en) * | 2012-11-22 | 2013-02-13 | 南京大学 | Device for implementing strengthened treatment for sewage through changing magnetic field and sewage treatment method |
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| Title |
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| 氯化钙控制污泥膨胀;黄程兰等;《环境工程学报》;20121105;第6卷(第11期);第3895-3897页第1.1、2.1、2.2、2.4小节 * |
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