CN109502933B - A kind of treatment method and system of waste water containing polyacrylamide - Google Patents
A kind of treatment method and system of waste water containing polyacrylamide Download PDFInfo
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
本发明提供了一种含有聚丙烯酰胺废水的处理方法及处理系统，其中处理方法主要包括以下步骤：1)将生物负载颗粒放入废水中浸渍，吸附废水中的聚丙烯酰胺以及土著微生物；2)向步骤1)得到的生物负载颗粒中加入微量元素溶液，促进所述土著微生物对聚丙烯酰胺进行厌氧降解；3)对步骤2)中得到的活性炭及生物污水臭氧氧化，处理完成。系统包括依次连接的厌氧降解装置、臭氧氧化装置及出料装置，以及生物负载颗粒的还原装置。本发明实现了生物法与物理吸附及化学反应的有机结合，降低了聚丙烯酰胺废水直接通入反应器发生堵塞的机率，能够从根本上减少聚丙烯酰胺对生态的破坏，本发明对活性炭进行重复利用，达到绿色经济，节能环保的处理效果。
The present invention provides a treatment method and treatment system for waste water containing polyacrylamide, wherein the treatment method mainly includes the following steps: 1) immersing bioburden particles into waste water, and adsorbing polyacrylamide and indigenous microorganisms in the waste water; 2) ) adding trace element solution to the bioloaded particles obtained in step 1) to promote the anaerobic degradation of polyacrylamide by the indigenous microorganisms; 3) ozonating the activated carbon and biological sewage obtained in step 2), and the treatment is completed. The system includes an anaerobic degradation device, an ozone oxidation device and a discharge device connected in sequence, and a reduction device for bioburden particles. The invention realizes the organic combination of biological method, physical adsorption and chemical reaction, reduces the probability that polyacrylamide waste water directly passes into the reactor to cause blockage, and can fundamentally reduce the ecological damage caused by polyacrylamide. Reuse to achieve green economy, energy saving and environmental protection treatment effect.
Description
Technical Field
The invention relates to the field of oil field wastewater treatment, in particular to a method and a system for treating polyacrylamide-containing wastewater by using a biological method and combining physical and chemical treatment processes.
Background
In the oil recovery industry, the recovery of oil using reservoir energy is commonly referred to as primary recovery; injecting water and gas into the oil layer, and supplementing energy to the oil layer to recover oil, namely secondary oil recovery; chemical substances are used for improving the mutual performance of oil, gas, water and rocks and producing more petroleum, which is called tertiary oil recovery. In the tertiary oil recovery method of the oil field, the polymer flooding technology occupies an important position. Among all polymers, polyacrylamide is most used due to its advantages of high relative molecular mass and good water solubility. After the polyacrylamide is dissolved in water, on one hand, the viscosity of the displacement fluid is increased, the oil-water fluidity ratio is reduced, and finally, the sweep coefficient is improved; on the other hand, the flow resistance of the displacement fluid at the high-permeability part of the oil reservoir is increased, so that the planar flow is more uniform, and the recovery ratio is improved.
However, in the oil extraction process, a large amount of polymer produced water with a certain concentration and a certain viscosity is correspondingly produced, the toxicity of residual monomer Acrylamide (AM) in the polyacrylamide-containing wastewater is very high, and the monomer Acrylamide (AM) is gradually accumulated in the environment and harms the environment if the monomer Acrylamide (AM) is directly discharged, and meanwhile, the reinjection of the polyacrylamide-containing wastewater causes oil layer pollution in a near-wellbore area, the water injection pressure is increased, the water injection is difficult, the oil production is reduced, and the problems caused by polymer flooding are increasingly serious. How to treat and utilize the produced water is a problem of increasing concern.
At present, the method for treating the waste water containing polyacrylamide mainly comprises a biological method, a chemical method, a physical method and a mixed use of two or more methods. (1) Although the biological method has strong economic applicability, environmental protection, energy conservation and no secondary toxic action, the efficiency is low and the time consumption is long. (2) Chemical methods have the advantage of high efficiency, but are not widely used due to high energy consumption and the tendency to produce environmentally harmful intermediates or products. (3) The physical method only has the functions of simple sedimentation and the like, and does not substantially degrade pollutants.
The existing sewage treatment process is relatively mature, and the core technologies of the biological method are an activated sludge method and a biofilm method, namely, the activated sludge or a biofilm in a bioreactor is utilized to decompose organic matters in sewage. Therefore, it is the main content and development direction of the present and future research to develop a new polymer-containing wastewater treatment technology by combining the chemical method and physical method with fast degradation speed without abandoning the economic and environmental protection of the biological method.
Most of the prior patents for treating wastewater containing polyacrylamide directly feed the wastewater into a bioreactor, but the polyacrylamide in the wastewater has high concentration, high viscosity and poor fluidity, is very easy to block the bioreactor, and brings a lot of technical troubles in daily operation.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a method for deeply treating waste water containing polyacrylamide, which combines physical adsorption of activated carbon; the anaerobic degradation of the microorganism with degradation function and the ozone oxidation of the residual pollutants in the degraded wastewater are realized, the organic combination of a biological method, physical adsorption and chemical reaction is realized, the probability that the polyacrylamide wastewater is directly introduced into a reactor to be blocked is effectively reduced, the damage of polyacrylamide to ecology can be fundamentally reduced, and more than 95 percent of pollutants in the treated wastewater are effectively degraded. The method can restore and reduce the pore structure of the degraded active carbon, and can recycle the active carbon, thereby greatly reducing the treatment cost of the wastewater, and achieving the treatment effects of environmental protection, energy saving and environmental protection.
The second purpose of the invention is to provide a system for wastewater treatment by adopting the method, the system can adsorb the wastewater containing polyacrylamide in pores of activated carbon, further effectively treat the wastewater through biodegradation and chemical oxidation, realize a continuous, complete and efficient treatment process, finally recycle the activated carbon subjected to reduction treatment, greatly reduce the wastewater treatment cost, and have the advantages of environmental protection and obvious economic benefit, and the system has important significance for process development in the field of wastewater treatment containing polyacrylamide.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
a method for treating waste water containing polyacrylamide mainly comprises the following steps:
1) the biological load particles are put into the wastewater for dipping, and polyacrylamide and indigenous microorganisms in the wastewater are adsorbed;
2) adding a trace element solution into the biological load particles obtained in the step 1) to promote the indigenous microorganisms to carry out anaerobic degradation on polyacrylamide;
3) carrying out ozone oxidation on the biological load particles obtained in the step 2) and the trace element solution containing polyacrylamide, and finishing the treatment.
Further, as an implementable scheme, the pore diameter on the bio-loaded particles in the step 1) is in a nanometer to micrometer scale, and the immersion adsorption time is controlled to be 24-48 h.
Further, as an implementable scheme, the hydraulic retention time of anaerobic degradation in the step 2) is controlled to be 6-48h, the time is controlled to be 10-20d, and the temperature is controlled to be 25-65 ℃.
Further, as an implementable means, the hydraulic retention time of ozone oxidation in the step 3)Controlling for 0-10h, controlling the ozone dosage at 2-10g O3/g TOC。
Further, as an implementable scheme, the step 3) further comprises the step of reducing and heating the biological complex particles after the ozone oxidation, wherein the heating temperature is controlled to be 400-600 ℃, and the time is controlled to be 0.5-3 h.
A treatment system for wastewater containing polyacrylamide by adopting the method comprises an anaerobic degradation device, an ozone oxidation device, a discharging device and a reduction device for biological load particles, which are connected in sequence; the anaerobic degradation device comprises an anaerobic degradation reactor, a trace element solution peristaltic pump is arranged at the bottom of the anaerobic degradation reactor, and a temperature adjusting device is wound on the outer wall close to the anaerobic degradation reactor; the ozone oxidation device comprises an ozone oxidation reactor and an ozone aeration disc arranged at the bottom of the ozone oxidation reactor; the discharging device is a discharging peristaltic pump connected with the ozone oxidation reactor; the reduction device comprises a tubular furnace and a vacuum system connected with the tubular furnace so as to ensure that the biological load particles are heated in an anaerobic environment.
Further, as an implementable scheme, the anaerobic degradation reactor comprises a packing layer formed by biological load particles, a trace element solution inlet is formed in the center of the bottom of the anaerobic degradation reactor, so that the trace element solution passes through the packing layer from bottom to top and is completely immersed in the packing layer, and a methane outlet is formed in the top of the anaerobic degradation reactor.
Further, as an implementable scheme, the ozone aeration disc is connected with an ozone generator through a pipeline, micropores with the aperture of 5-100 μm are uniformly distributed on the ozone aeration disc, the pore diameters of the micropores on the same circle center of the ozone aeration disc are the same in the circumferential direction, and the pore diameters of the micropores are gradually reduced from outside to inside in the radial direction.
Further, as an implementable scheme, the temperature adjusting device is a heating belt for keeping the temperature of the solution in the anaerobic degradation reactor constant or heating.
Further, as an implementable scheme, the bio-loaded particles are coconut shell microporous activated carbon or porous zeolite molecular sieves.
The invention utilizes the porous structure and relatively large specific surface area and porosity of catalyst carriers such as active carbon or molecular sieve, etc. to intensively adsorb polyacrylamide and indigenous functional microorganisms in the wastewater together through physical adsorption; in the following biological anaerobic degradation process, the microorganism with degradation function adsorbed by the biological load particles takes polyacrylamide as a carbon source and a nitrogen source to propagate in a large quantity so as to degrade the polymer, and the biological load particles provide a good habitat for the microorganism and form a good biofilm structure in pores; in the anaerobic fermentation step, the biochemical performance of polyacrylamide is enhanced, only part of pollutants which cannot be removed by a biological method are left, and a tamping basis is laid for the next degradation; in the last ozone oxidation step, the residual pollutants can be further oxidized and degraded by using the strong chemical oxidizing property of ozone, and more than 95 percent of pollutants in the wastewater can be degraded through the process of the step, so that the wastewater meets the biochemical index requirement of direct discharge.
Compared with the prior art, the invention has the following beneficial effects:
1) the organic combination of physical adsorption, biological degradation and chemical oxidation is adopted to ensure the treatment effect of the waste water containing polyacrylamide;
2) after the polyacrylamide is adsorbed by the biological load particles, the polyacrylamide is put into the anaerobic degradation reactor, so that the probability that the polyacrylamide solution directly blocks the anaerobic degradation reactor can be effectively reduced;
3) and the biological load particles after the treatment are reduced and recovered, so that the cost of wastewater treatment is greatly reduced, and the method is green, economic and environment-friendly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of the treatment of waste water containing polyacrylamide according to the present invention;
FIG. 2 is a scanning electron micrograph of pores of the activated carbon before adsorption in the example;
FIG. 3 is a scanning electron micrograph of the biofilm inside the activated carbon according to the example;
FIG. 4 is a scanning electron microscope image of the activated carbon after the reduction by high-temperature heating in the tube furnace in the example;
fig. 5 is a schematic view showing the arrangement of the micropores of the ozone aeration disk in the example.
Reference numerals:
1 anaerobic degradation reactor; 1-1, a methane outlet;
2, a peristaltic pump for trace element solution;
3 heating the belt;
4, an ozone oxidation reactor;
4-1 ozone aeration disc; 4-2 ozone generator;
5, a discharge peristaltic pump;
6, a tube furnace;
7 vacuum system.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The method for treating the waste water containing polyacrylamide mainly comprises the following steps:
1) the biological load particles are put into the wastewater for dipping, and polyacrylamide and indigenous microorganisms in the wastewater are adsorbed;
2) adding a trace element solution into the biological load particles obtained in the step 1) to promote the indigenous microorganisms to carry out anaerobic degradation on polyacrylamide;
3) carrying out ozone oxidation on the biological load particles obtained in the step 2) and the trace element solution containing polyacrylamide, and finishing the treatment.
Indigenous microorganisms are one of five basic materials in natural agriculture, take soil as a habitat of the indigenous microorganisms, are microbial communities growing in local soil for hundreds of years, and adhere to the microorganisms in the living field of the indigenous microorganisms. Indigenous microorganisms are a community composed of dozens of microorganisms such as carbon-fixing photosynthetic bacteria, disease-inhibiting actinomycetes, saccharomycetes that decompose sugars, and lactic acid bacteria that decompose efficiently under anaerobic conditions. The method mainly adopts the indigenous microorganism population in the wastewater containing the polyacrylamide, and the unique function of degrading the polymer by taking the polymer as a carbon source and a nitrogen source through mass propagation can effectively degrade the polyacrylamide in the treatment. The matching of the trace element solution is also aimed at the trace elements required by the indigenous microorganism population, the population is further optimized in the loaded microorganisms, so that the indigenous microorganisms are enriched in the gaps of the activated carbon and form a good biofilm structure, and the stable habitat is provided for the microorganisms.
The principle of the treatment process of the waste water containing polyacrylamide is as follows, and the biological load particles are illustrated by taking activated carbon as an example:
(1) preparing activated carbon: preparing loose and porous activated carbon by using the dried coconut shells, wherein the pores are in the nanometer to micrometer level;
(2) activated carbon adsorption treatment: and (2) placing the activated carbon prepared in the step (1) in the polyacrylamide-containing wastewater in the oil field for 24-48h to reach adsorption saturation by utilizing the physical adsorption effect of the activated carbon. The activated carbon has a large specific surface area, generally about 500m2And g, after the activated carbon is adsorbed, polyacrylamide in the wastewater and indigenous functional microorganisms capable of degrading polyacrylamide are adsorbed in pores of the activated carbon in a concentrated manner.
(3) Anaerobic fermentation biological treatment: the anaerobic degradation reactor stays for 24 hours hydraulically, the temperature is maintained to be 53 ℃ by winding a heating belt outside, activated carbon which is adsorbed and saturated in the step (2) is put into the anaerobic biological reactor, a trace element solution which is necessary for maintaining the growth of microorganisms is configured, the pH value of the trace element solution is adjusted to be 7, the activated carbon is added into the anaerobic degradation reactor from bottom to top through a trace element solution peristaltic pump, the trace element solution can enrich the microorganisms in pores of the activated carbon, the activated carbon is characterized through 14d of anaerobic environment cultivation, referring to figure 3, an SEM chart shows that a good biomembrane structure is formed in the pores of the activated carbon, a stable habitat is provided for the microorganisms, a substrate generated by the life activities of the microorganisms can protect the microorganism community structure from being damaged by the external environment, and a methane outlet which is arranged at the top of the anaerobic degradation reactor can discharge methane generated in the degradation process in time, the safety in the processing process is guaranteed.
(4) Treating by an ozone oxidation reactor: evaluating the degree of anaerobic degradation according to the effluent of the anaerobic degradation reactor, when the concentration of polyacrylamide in the effluent of the anaerobic degradation reactor is continuously reduced and tends to be stable, putting the activated carbon into an ozone oxidation reactor, and adding the activated carbonAnd the microelement liquid containing polyacrylamide flows out after the anaerobic degradation process in the previous step is introduced. The activated carbon and the biological sewage are subjected to ozone aeration oxidation together. The hydraulic retention time of the ozone oxidation reactor is 2h, and the ozone dosage is 5g O3Per g TOC, ozone is generated by an ozone generator. The bottom of the ozone oxidation reactor is provided with a micropore ozone aeration disc with the diameter of 10cm and the pore size of 5-100 mu m for ozone aeration, and the effluent of the ozone oxidation reactor can be directly discharged or recycled.
(5) Treating by a tubular furnace: after the ozone oxidation treatment is finished, the activated carbon is placed into a tube furnace, oxygen is isolated under the action of a vacuum system, the activated carbon is heated for 1h at 550 ℃, the temperature programming is set to be 10 ℃ per minute, and the step is used for carrying out high-temperature mineralization treatment on the activated carbon. Mineralization is a general term of a process of converting organic compounds in soil into inorganic compounds under the action of soil microorganisms, and high-temperature mineralization generated in the activated carbon can convert indigenous microorganisms, residual trace element solutions, biofilms and the like into inorganic substances such as carbon sources and nitrogen sources required by organisms, so that inorganic nutrients required by the microorganisms are supplied for recycling of the activated carbon.
(6) And (3) recycling the activated carbon: the activated carbon after high-temperature mineralization treatment in the tubular furnace further removes microorganisms and polyacrylamide in the activated carbon, recovers the porosity of the activated carbon, can be used for adsorption for many times, and realizes the reutilization of the activated carbon.
The technical effects brought by the present invention are mainly described in the following aspects, which are combined with the system for treating waste water containing polyacrylamide provided by the present invention.
Referring to fig. 1, the wastewater treatment system of the present invention comprises an anaerobic degradation device, an ozone oxidation device, a discharge device, and a reduction device for biological load particles, which are connected in sequence; the anaerobic degradation device comprises an anaerobic degradation reactor 1, a trace element solution peristaltic pump 2 is installed at the bottom of the anaerobic degradation reactor 1, a heating belt 3 for keeping the temperature of or heating the solution and the active carbon in the anaerobic degradation reactor constant is wound on the outer wall close to the anaerobic degradation reactor, and a methane outlet 1-1 is further arranged at the top of the anaerobic degradation reactor. The ozone oxidation device comprises an ozone oxidation reactor 4 and an ozone aeration disc 4-1 arranged at the bottom of the ozone oxidation reactor, wherein the ozone aeration disc 4-1 is connected with an ozone generator 4-2 through a pipeline; the discharging device is a discharging peristaltic pump 5 connected with the ozone oxidation reactor 4; the reduction device comprises a tubular furnace 6 and a vacuum system 7 connected with the tubular furnace 6 so as to ensure that the biological load particles are heated in an anaerobic environment. The vacuum system in the invention adopts a vacuum pump to form a vacuum environment, the two ends of the tube furnace are sealed and then connected with the vacuum system to form an oxygen/air isolated state, the operation can be realized by adopting the prior conventional technology, and no further description is needed.
Referring to fig. 2, the activated carbon has abundant pores and a large specific surface area, and can form an efficient physical adsorption of indigenous microorganisms and polymers. After the polyacrylamide-containing wastewater in the oil field is adsorbed and saturated by using the activated carbon, the activated carbon contains abundant indigenous functional microorganisms and polyacrylamide inside, is placed into the anaerobic degradation reactor 1 to serve as a filler layer, is prepared with a trace element solution, flows through the anaerobic degradation reactor 1 containing the activated carbon filler layer from bottom to top from a trace element solution inlet at the center of the bottom of the anaerobic degradation reactor 1, and completely submerges the filler layer. The element liquid flows through the anaerobic degradation reactor 1 and contacts with microorganisms in the activated carbon filler layer, so that necessary nutrient elements are provided for the growth of the microorganisms, the formation of a biological membrane is benefited, the polyacrylamide adsorbed in the activated carbon is promoted to be degraded by the microorganisms, and the structure of the biological membrane formed in the activated carbon after the anaerobic degradation is detailed in figure 3.
And (3) evaluating the anaerobic degradation degree according to the effluent of the anaerobic degradation reactor 1, and when the concentration of polyacrylamide in the effluent of the anaerobic degradation reactor 1 is continuously reduced and tends to be stable, putting the activated carbon into an ozone oxidation reactor 4, and adding the sewage generated in the last step of anaerobic degradation for ozone aeration. The bottom of the ozone oxidation reactor 4 is provided with a micron-level ozone aeration disc 4-1, so that ozone molecules generated by the ozone generator 4-2 are dispersed into more tiny bubbles, the contact area between the ozone molecules and pollutants in sewage is increased, the degradation efficiency is improved, and the wastewater treated by the ozone oxidation reactor 4 can be discharged or recycled. Micropores with the aperture of 5-100 mu m are uniformly distributed on the ozone aeration disc 4-1, the aperture of the micropores on the same circle center of the ozone aeration disc 4-1 is the same in the circumferential direction, and the aperture of the micropores is gradually reduced from outside to inside along the radial direction, as shown in detail in figure 5. This kind of setting up mode can make ozone bubble more abundant with active carbon and sewage contact, increase area of contact guarantees ozone oxidation's treatment effect.
It should be noted here that the polyacrylamide concentration in the activated carbon treated by the physical adsorption-anaerobic degradation reactor-ozone oxidation reactor is already reduced to a very low level, and the high-temperature mineralization reduction treatment is performed in the tube furnace 6 to further remove the microorganisms and polyacrylamide in the activated carbon, recover the porosity of the activated carbon, and can be used for adsorption for many times to realize the recycling of the activated carbon, and the details of the internal structure of the activated carbon after high-temperature heating reduction are shown in fig. 4.
The specific treatment process in the invention comprises the following steps: activated carbon which is adsorbed and saturated in polyacrylamide-containing wastewater in an oil field is put into an anaerobic degradation reactor 1, the temperature of an anaerobic reactor is 53 ℃, anaerobic degradation of the polyacrylamide-containing wastewater is carried out, a biocoesis which is better than 30 ℃ is formed inside the activated carbon at 53 ℃, and a scanning electron microscope picture of activated carbon pores in the anaerobic degradation reactor in figure 3 shows that a stable biofilm structure is formed inside the activated carbon under the condition of anaerobic fermentation through enrichment of trace element solution, and the generation of the biofilm provides a stable place for microbial degradation of polyacrylamide. The wastewater treated by the anaerobic degradation reactor 1 and the activated carbon treated for 14 days in the anaerobic degradation reactor 1 are put into an ozone oxidation reactor 4 together for chemical oxidation treatment, so that polyacrylamide and pollutants which are difficult to degrade in the wastewater are further removed in a short time, microorganisms and impurities in the activated carbon are removed, the time efficiency is improved, and the quality of the effluent is improved. The ozone aeration disc 4-1 arranged at the bottom of the ozone oxidation reactor disperses ozone molecules generated by the ozone generator 4-2 into tiny bubbles, increases the contact area of ozone and wastewater and improves the utilization rate of ozone. And (3) carrying out 550 ℃ high-temperature anaerobic mineralization reaction on the activated carbon after the ozone oxidation treatment in a tubular furnace 6, and heating for 1h at 550 ℃ at the temperature of 10 ℃ per minute by temperature programming. The pollutants and impurities in the pores of the activated carbon are thoroughly removed, and the attached figure 4 shows that the high-temperature mineralization effectively recovers the porosity of the activated carbon, realizes the reutilization and reduces the economic loss. The effluent after ozone treatment reaches the discharge standard. It should be noted that, in the present invention, besides using activated carbon, the bio-supported particles may also be porous zeolite molecular sieves, and the regular pore channel structure, the higher specific surface area and the porosity thereof are also suitable for adsorbing and forming polyacrylamide and microbial membranes in wastewater. Of course, other catalyst carriers with microporous structure and high porosity should be within the technical scope protected by the present invention according to the design concept of the present invention, and will not be described in detail.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
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