A method and system for treating sludge containing polyacrylamide

Abstract

The present invention belongs to the technical field of sludge treatment, and discloses a method and a system for treating sludge containing polyacrylamide. The method includes: strengthening the inoculation of CPAM-degrading functional bacteria agents and extremely thermophilic bacteria agents respectively in different periods of high-temperature aerobic composting to construct a new multi-stage enhanced ultra-high-temperature aerobic composting system for CPAM-degrading functional bacteria; performing ozone aeration and ultraviolet irradiation on the sludge after ultra-high-temperature aerobic composting treatment for deep removal of CPAM; compressing and dehydrating the compost body after removing CPAM to obtain a resource product; performing ozone / ultrasonic activation treatment on activated carbon to restore the activity of the activated carbon. The composting cycle of the present invention is shorter, and the CPAM removal efficiency is higher; the heat preservation measures for the compost body are more comprehensive to prevent heat loss; the treated product does not contain pathogens and has a higher degree of hygiene; the present invention ensures the recycling of activated carbon to the greatest extent.

Description

Technical Field

[0001] The present invention belongs to the technical field of sludge treatment, and particularly relates to a method and a system for treating sludge containing polyacrylamide. Background Art

[0002] In 2019, the annual output of sludge in China has exceeded 60 million tons (calculated based on a moisture content of 80%), and it is expected that the annual output of sludge will exceed 90 million tons in 2025. The moisture content of sludge is extremely high, which causes difficulties in transportation, treatment, and utilization. Therefore, dehydration and volume reduction treatment are required before disposal. The organic components such as microorganisms and extracellular polymers in sludge will seriously affect the dehydration performance of sludge. Therefore, it is necessary to condition the sludge before dehydration treatment. The flocculation sedimentation technology is the most widely used in the sludge conditioning process due to its high efficiency, economy, and simple operation. Among various flocculants, CPAM can effectively adsorb and bridge and neutralize electrically, with strong flocculation ability, and is the most widely used. The addition amount is generally 0.1% - 0.5%. Moreover, with the continuous improvement of the requirements for sludge dehydration rate in transportation, treatment, and disposal, etc., the addition amount of CPAM in sludge may continue to increase.

[0003] The treated sludge needs to be safely disposed of, that is, the treated sludge is disposed of. At present, the main disposal methods in China are landfill, incineration, and land use after anaerobic digestion or aerobic composting. A large amount of CPAM will enter the environment and exist for a long time during the sludge landfill process. The sludge incineration process can effectively remove CPAM, but a large amount of toxic and harmful gases will be generated during the incineration process, with a high risk of secondary pollution and a serious NIMBY effect. The reaction cycle of anaerobic digestion and aerobic composting is long, and only part of CPAM can be removed. A large amount of CPAM will still enter the environment during the land use process.

[0004] Excessive CPAM will cause soil compaction, reduction of porosity and water permeability, and inhibitory effects on the growth of plants. Moreover, CPAM in the environment will decompose to produce AM monomers with extremely strong toxicity. Therefore, the potential threat of continuously accumulating CPAM in the environment to human health and the ecological environment is becoming increasingly serious.

[0005] Ultra-high temperature aerobic composting is an aerobic fermentation technology developed on the basis of traditional high-temperature aerobic composting. Based on an aerobic fermentation microbial colony containing extremely thermophilic microorganisms, the composting temperature can quickly rise to 80 - 100°C without relying on external heat sources, much higher than traditional high-temperature aerobic composting. Due to the effective participation of extremely thermophilic microorganisms, the ultra-high temperature aerobic composting cycle is significantly shortened, the removal rate of organic pollutants is higher, and the hygienic degree of compost products is higher.

[0006] Bioremediation technology has also shown obvious positive effects in the composting degradation process of pollutants. For example, Castro-Aguirre et al. strengthened the inoculation of the polylactic acid-degrading functional bacterium Geobacillus thermoleovorans during composting, and the results showed that compared with the control group, the strengthened inoculation could significantly improve the degradation efficiency of polylactic acid. Ultra-high temperature aerobic composting successively experiences the heating period, ultra-high temperature period, high temperature period and maturity period. During this period, various physical and chemical properties of the compost pile change significantly, especially the temperature change is particularly drastic. If inoculated in the traditional way, that is, inoculating the functional bacteria into the compost pile at one time in the initial stage of composting, its activity will change with the change of the compost pile temperature and even be completely lost.

[0007] Through the above analysis, the problems and defects of the existing technology are as follows: the existing technology adopts direct landfill; incineration; land use after anaerobic digestion; land use after aerobic composting; the technical defects of direct landfill are: CPAM is untreated, and a large amount of CPAM will enter the environment directly with the sludge; the technical defects of incineration are: the incineration equipment has a complex structure, large investment, and incineration produces a variety of toxic and harmful gases such as dioxins, and the NIMBY effect is serious. The technical defects of anaerobic digestion are: the anaerobic biological metabolism rate is low, the reaction period is long, the CPAM degradation rate is low, and odors are generated during the anaerobic digestion process, which is likely to affect the surrounding air quality; the technical defects of the ordinary (traditional) aerobic composting technology adopted in the existing technology are: the reaction period is long and the CPAM degradation rate is low; therefore, it is necessary to develop a method and system that can simultaneously achieve high-efficiency degradation of CPAM and sludge resource utilization. Summary of the Invention

[0008] To overcome the problems existing in the related technology, the disclosed embodiments of the present invention provide a method and system for treating sludge containing polyacrylamide.

[0009] The technical solution is as follows: A method for treating sludge containing polyacrylamide includes the following steps:

[0010] Step 1, strengthen the inoculation of CPAM-degrading functional bacteria agent and extreme thermophilic bacteria agent at different stages of ultra-high temperature aerobic composting respectively, construct a new multi-stage enhanced ultra-high temperature aerobic composting system of CPAM-degrading functional bacteria, and perform ultra-high temperature aerobic composting on the sludge containing CPAM;

[0011] Step 2, perform ozone aeration and ultraviolet irradiation treatment on the composting product of ultra-high temperature aerobic composting to deeply remove CPAM by chemical oxidation;

[0012] Step 3, compress and dehydrate the chemical oxidation product to reduce the moisture content and obtain a resource product.

[0013] Step 4, perform ozone / ultrasonic activation treatment on the used activated carbon to restore the activity of the activated carbon for use in the next sludge treatment cycle.

[0014] In one embodiment, in step one, the CPAM-degrading functional bacterium agent and the extreme thermophilic bacterium agent are intensively inoculated at different stages of high-temperature aerobic composting, respectively, to construct a new multi-stage intensified ultra-high-temperature aerobic composting system for CPAM-degrading functional bacteria, and the ultra-high-temperature aerobic composting of CPAM-containing sludge includes the following steps:

[0015] The compost temperature rises. When the temperature rises to 35 °C, the CPAM-degrading functional bacterium agent A is added through the dosing hole by the bacterium agent metering device, and the dosage is 0.01% - 5% of the mass fraction of the CPAM-containing sludge; the CPAM-degrading functional bacterium agent A includes one or more of Bacillus megaterium, Bacillus cereus, Bacillus subtilis, and Cellulomonas flavigena;

[0016] During the ultra-high temperature period of composting, when the temperature rises to 65 °C, the extreme thermophilic bacterium agent is added through the bacterium agent dosing hole by the bacterium agent metering device, and the dosage is 0.01% - 3% of the mass fraction of the CPAM-containing sludge; the extreme thermophilic bacterium agent includes one or more of Calditerricola yamamurae, Calditerricola satsumensis, and Thermus thermophilus;

[0017] During the high temperature period of composting, when the temperature drops to 55 °C, the CPAM-degrading functional bacterium agent B is added through the dosing hole by the bacterium agent metering device, and the dosage is 0.01% - 5% of the mass fraction of the CPAM-containing sludge; the CPAM-degrading functional bacterium agent B includes one or more of Bacillus megaterium, Bacillus coagulans, and Bacillus licheniformis;

[0018] During the compost maturity period, when the temperature drops to 30 °C, the CPAM-degrading functional bacterium agent C is added through the dosing hole by the bacterium agent metering device, and the dosage is 0.01% - 5% of the mass fraction of the CPAM-containing sludge; the CPAM-degrading functional bacterium agent C includes one or more of Streptomyces griseorubens, Bacillus megaterium, and Bacillus subtilis;

[0019] The bacterial concentrations of the CPAM-degrading functional bacterium agent A, the extreme thermophilic bacterium agent, the CPAM-degrading functional bacterium agent B, and the CPAM-degrading functional bacterium agent C are all 1 - 7×10 8 CFU / mL.

[0020] The above-mentioned microbial agents are all enriched culture solutions of single-strain bacteria or multi-strain bacteria, and the bacteria are all purchased from a third-party agency company.

[0021] In one embodiment, in Steps 1 and 2, the activated carbon includes one of oak activated carbon, coconut shell activated carbon, and columnar activated carbon.

[0022] In one embodiment, in Step 3, after the stack body after removing CPAM is compressed and dehydrated, it returns to Step 1 for circulation;

[0023] After compression and dehydration, the activated carbon is regenerated by ozone / ultrasonic activation using an activated carbon ozone / ultrasonic activation regeneration device.

[0024] Another object of the present invention is to provide a system for treating sludge containing polyacrylamide, including:

[0025] A novel multi-stage enhanced ultra-high temperature aerobic composting system with CPAM-degrading functional bacteria, which is used for ultra-high temperature aerobic composting of sludge containing polyacrylamide, and uses CPAM-degrading functional bacteria to enhance the removal efficiency of CPAM in the ultra-high temperature aerobic composting process;

[0026] A chemical oxidation system, which is used to perform ozone aeration and ultraviolet irradiation on the composting product of ultra-high temperature aerobic composting after the ultra-high temperature aerobic composting is completed, so as to further remove the residual CPAM in the sludge;

[0027] A physical compression system, which is used for deep dehydration of the chemical oxidation product to obtain a resource product;

[0028] An activated carbon regeneration system, which is used to activate and regenerate the used activated carbon to realize the recycling of the activated carbon.

[0029] In one embodiment, the novel multi-stage enhanced ultra-high temperature aerobic composting system with CPAM-degrading functional bacteria includes:

[0030] A water storage tank is connected to a water temperature regulating device through a water pump; the water temperature regulating device is connected to a moisture content regulating device; the moisture content regulating device is installed inside a temperature and moisture content monitoring instrument;

[0031] The shell of the composting tank is a double-shell structure inside and outside, and the inner and outer shells form a space for the circulation of circulating water (oil). The inlet and outlet of the circulating water are respectively connected to a constant temperature circulating water bath system through water pipes;

[0032] The temperature and moisture content monitoring instrument is connected to a microbial agent quantitative addition device through a medicine adding hole, and the microbial agent quantitative addition device is connected to a temperature and moisture content monitoring system through a wire.

[0033] A bottom aeration device of a composting reactor installed inside the composting tank and connected to a gas flow meter;

[0034] The bottom aeration device of the compost reactor includes a bottom aeration annular pipe of the compost reactor; aeration annular pipe air holes are formed in the bottom aeration annular pipe of the reactor, and gaskets are arranged below different positions of the bottom aeration annular pipe of the compost reactor;

[0035] A pressure-bearing sieve plate is arranged above the bottom aeration annular pipe of the compost reactor, and support legs are arranged at the edge of the pressure-bearing sieve plate;

[0036] The temperature and moisture content monitoring system includes a temperature and moisture content monitoring terminal, sensors for detecting the temperature and moisture content at different positions in the upper, middle, and bottom of the compost tank, and a moisture content adjusting device;

[0037] The sensors transmit the temperature and moisture content at different positions of the compost body detected to the moisture content monitoring terminal for display and recording;

[0038] The moisture content adjusting device includes a driver, a stirring spiral ribbon, and a stirring screw;

[0039] The driver is installed above the tank cover of the compost tank; the stirring spiral ribbon and the stirring screw are located below the tank cover of the compost tank;

[0040] The stirring screw and the spiral ribbon are divided into upper, middle, and bottom sections, and the independent rotation and linkage rotation of different stirring spiral ribbons are realized through a disassembly and separation method;

[0041] Water outlets at different positions for water flow to pass through are arranged in the spaces between different sections of the stirring spiral ribbons; the water outlets are communicated with the water temperature adjusting device; and the water outlets discharge water independently and in linkage as required.

[0042] In one embodiment, the chemical oxidation system includes:

[0043] The bottom aeration device of the compost reactor installed inside the compost tank and connected to a gas flow meter;

[0044] The bottom aeration device of the compost reactor includes a bottom aeration annular pipe of the compost reactor; aeration annular pipe air holes are formed in the bottom aeration annular pipe of the reactor, and gaskets are arranged below different positions of the bottom aeration annular pipe of the compost reactor;

[0045] A pressure-bearing sieve plate is arranged above the bottom aeration annular pipe of the compost reactor, support legs are arranged at the edge of the pressure-bearing sieve plate, and a compost body for ultra-high temperature aerobic composting is placed on the load-bearing sieve plate;

[0046] The chemical oxidation system includes an ozone generator, which is connected to a gas temperature regulation and control device and is connected to the bottom aeration annular pipe of the compost reactor through a connected gas flow meter;

[0047] The chemical oxidation system further includes: an ultraviolet lamp is provided below the tank cover to irradiate the stack body.

[0048] In one embodiment, the physical compression system includes:

[0049] After removing the stirring spiral ribbon and the stirring screw, a compression disc is installed on the drive by bolts. Driven by the drive, the compression disc moves up and down to perform high-pressure compression dehydration on the stack body.

[0050] A pressure sensor is fixed on the upper surface of the pressure-bearing sieve plate to monitor the pressure borne by the pressure-bearing sieve plate and the bottom of the composting tank during the physical compression process. When the pressure reaches the set value, the pressure sensor feeds back a wireless signal to control the drive in the water rate regulating device to stop running.

[0051] In one embodiment, the activated carbon regeneration system includes: an activated carbon ozone / ultrasonic activation regeneration device connected to an ozone generator performs ozone aeration oxidation and ultrasonic treatment on the used activated carbon.

[0052] Combining all the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0053] First, in view of the technical problems existing in the above-mentioned prior art and the difficulty of solving this problem, closely combining the technical solution to be protected by the present invention and the results and data in the R & D process, etc., analyze in detail and deeply how the technical solution of the present invention solves the technical problems and the creative technical effects brought after solving the problems. The specific description is as follows:

[0054] The present invention rapidly and efficiently degrades CPAM in the sludge of sewage treatment plants, reduces the harm of CPAM to the environment, and improves the safety of sludge land use.

[0055] The present invention rapidly realizes the resource utilization of the sludge of sewage treatment plants, making it available for greening grasslands, soil improvement, soil remediation, and mine remediation, etc.

[0056] To improve the activity of high-efficiency CPAM-degrading functional bacteria and the degradation efficiency of CPAM, the present invention conducts multi-stage enhanced inoculation according to the temperature changes in different composting periods and the optimal temperature ranges of different functional bacteria, and constructs a new type of multi-stage enhanced ultra-high temperature aerobic composting system for high-efficiency CPAM-degrading functional bacteria, which can make the stack body rich in high-efficiency CPAM-degrading functional bacteria in different composting periods.

[0057] The synergistic effect of ultra-high temperature aerobic composting and multi-stage enhanced inoculation of high-efficiency degrading functional bacteria realizes the efficient degradation of CPAM in sludge and the stabilization, reduction, and resource utilization of sludge.

[0058] Considering the high stability of the molecular structure of CPAM and the limitations of biodegradation, the ultra-high temperature composting products are further treated by ozone oxidation and ultraviolet irradiation to achieve the organic coupling of biodegradation and chemical oxidation and realize the deep removal of CPAM in the sludge.

[0059] While ozone is aerated, the stirring device and the ultraviolet irradiation lamp are turned on to uniformly irradiate the composting products. The synergistic effect of ozone oxidation and ultraviolet irradiation realizes the deep chemical oxidation removal of the residual CPAM in the composting products and the complete killing of pathogenic microorganisms.

[0060] After the treatment, the activated carbon (oak activated carbon, coconut shell activated carbon, columnar activated carbon) is regenerated by ozone / ultrasound.

[0061] Compared with the prior art, the advantages of the present invention further include:

[0062] (1) Based on the ultra-high temperature aerobic composting method, the present invention strengthens the ultra-high temperature aerobic composting by means of multi-stage intensive inoculation of CPAM-degrading functional bacteria. The direct effects are as follows: The ultra-high temperature aerobic composting method can shorten the composting period, promote compost maturity, and improve the quality of compost products; inoculating CPAM-degrading functional bacteria can increase the degradation rate of CPAM during the composting process; the operation of multi-stage intensive inoculation can fully ensure the activity of CPAM-degrading functional bacteria. During different periods of composting, the physical and chemical properties such as the temperature and pH of the compost pile vary greatly. Therefore, inoculating in stages is beneficial to promoting the metabolism and reproduction of different CPAM-degrading functional bacteria, and thus promoting the degradation of CPAM.

[0063] (2) By subjecting the sludge after composting treatment to ozone aeration and ultraviolet irradiation, the present invention realizes the coupling of biodegradation and chemical oxidation, and further increases the degradation rate of CPAM. In addition, the ozone aeration process and the ultraviolet irradiation treatment completely kill the pathogenic microorganisms in the composting products, greatly improving the biological safety of the products. The direct effects are as follows: Due to the ultra-high molecular weight and highly stable molecular structure of CPAM, simple biological composting cannot completely remove 100% of the CPAM in the sludge, while the residual CPAM in the sludge after biological composting can be completely removed by chemical oxidation means such as ozone aeration and ultraviolet irradiation; since the product does not contain CPAM and pathogenic microorganisms, its environmental safety is greatly improved.

[0064] (3) The maximum temperature during the ultra-high temperature composting process is 80 - 100 °C, with a large temperature difference from the external normal temperature environment. Heat preservation is extremely important for ultra-high temperature aerobic composting. Therefore, the air output by the air pump 5 needs to pass through the gas temperature regulation and control device to ensure that the air entering the compost body is not more than 0.1 °C lower than the compost body temperature (compost body temperature - 0.1 °C ≤ air temperature entering the compost body ≤ compost body temperature). The direct effects are as follows: It avoids the composting failure caused by the large heat loss of the compost body during the traditional normal temperature aeration and oxygenation process; the aeration temperature is not higher than the compost body temperature, which not only avoids the interference of the aeration process on the composting process but also helps to save energy and reduce consumption.

[0065] The most important purpose of aeration is to provide oxygen for the microorganisms in the compost body. Therefore, in this invention, aeration is not limited to air, and oxygen, a mixture of air and oxygen, a mixture of water vapor and oxygen, a mixture of other gases and oxygen, etc. are all acceptable.

[0066] (4) The maximum temperature during the ultra-high temperature composting process is 80 - 100 °C, with a large temperature difference from the external normal temperature environment. Heat preservation is extremely important for ultra-high temperature aerobic composting. Therefore, a constant temperature circulating water bath system is arranged outside the composting device, and the water bath temperature is not more than 0.1 °C lower than the compost body temperature (compost body temperature - 0.1 °C ≤ water bath temperature ≤ compost body temperature). The direct effects are as follows: When the compost body temperature is relatively high, heat will not be directly lost to the surrounding normal temperature environment through the outer wall of the composting tank, resulting in composting failure; controlling the water bath temperature not to be higher than the compost body temperature can not only avoid the interference of the water bath on the composting process but also help to save energy and reduce consumption.

[0067] The circulating water bath is only the most typical one of the heat preservation measures for composting in this invention. Heat preservation measures such as circulating oil bath, circulating gas bath, or infrared radiation are also acceptable.

[0068] (5) The temperature-water content monitoring instrument of the present invention is provided with a plurality of temperature-water content detection sensors inside the composting tank, which can independently monitor and record the temperature and water content of different positions (top, middle and bottom) of the composting body; the stirring ribbon and stirring screw of the present invention are divided into three sections: top, middle and bottom, which can rotate independently and in conjunction with each other; the water outlet of the moisture content regulating device is arranged at different positions (top, middle and bottom) of the stirring ribbon and stirring screw, and can operate independently and in conjunction with each other (discharge water) according to actual needs. The direct effects are as follows: the water outlets arranged at the top, middle and bottom of the stirring belt and the stirring screw are conducive to the targeted adjustment of the moisture content of the pile in the vertical direction, and the water outlets arranged on the stirring belt and the stirring screw are conducive to the rapid and uniform distribution of water in the horizontal direction; during the composting process, since the moisture in the pile rises with the hot air flow, it is easy to cause the moisture content of the upper part of the pile to be higher than that of the bottom. The present invention can independently monitor the moisture content of the pile at different positions, and replenish the moisture of the pile through the water outlets at different positions according to the moisture content at different positions, thus avoiding the uneven moisture replenishment of the pile caused by the traditional top-down spraying method. For example: when the moisture content in the middle and bottom of the pile is low, the water outlets in the middle and bottom of the stirring belt and the stirring screw can be used to replenish the moisture to the middle and bottom of the pile. At the same time, the stirring belt and the middle and bottom of the stirring screw rotate to promote the uniform distribution of moisture.

[0069] (6) Before the supplementary water enters the tank, it is first pumped into the water temperature regulating device to adjust the water temperature to a temperature difference of less than 0.1°C with the pile body, so as to prevent the supplementary water from absorbing the heat of the pile body and causing the pile body temperature to drop. The direct effect is that after the supplementary water is adjusted by the temperature regulating device, the temperature difference with the pile body is extremely small. After entering the pile body through the water outlet on the stirring belt and the stirring screw, it has no obvious effect on the temperature of the pile body and will not cause the temperature of the pile body to change.

[0070] (7) In order to improve economic efficiency and reduce treatment costs, the present invention provides an activated carbon ozone / ultrasound regeneration device and steps to ensure the recycling of activated carbon to the greatest extent. The direct effect is that after ozone / ultrasound treatment, the activated carbon can be used again for the next cycle of sludge treatment, and only a small amount of new activated carbon needs to be added to make up for the loss during the ozone / ultrasound treatment process.

[0071] (9) The composting cycle of the present invention is shorter, and the CPAM removal efficiency is higher; the heat preservation measures of the pile are more comprehensive to prevent heat loss; the treated product does not contain pathogens and has a higher degree of hygiene. The activated carbon can be fully utilized, saving costs.

[0072] Second, considering the technical solution as a whole or from the perspective of the product, the technical effects and advantages of the technical solution to be protected by the present invention are described in detail as follows:

[0073] The present invention rapidly and efficiently degrades CPAM in the sludge of sewage treatment plants, eliminates the harm of CPAM to the environment, and improves the safety of sludge land use. It rapidly realizes the resource utilization of the sludge of sewage treatment plants, making it available for green grasslands, soil improvement, soil remediation, mine remediation, etc.;

[0074] The multi-stage inoculation of CPAM-degrading functional bacteria provided by the present invention avoids the decline or even inactivation of the activity of CPAM-degrading functional bacteria caused by the temperature change of the compost heap during the composting process. Moreover, the quantitative addition device of the bacterial agent in the present invention realizes the automation of the addition of the bacterial agent, improves the accuracy and efficiency of the addition of the bacterial agent, and avoids the cumbersome manual operation;

[0075] The multiple heat preservation and temperature control measures such as temperature-adjusting aeration and temperature-adjusting water bath provided by the present invention make the heat of the compost heap not easily dissipated, the composting process is no longer affected by the surrounding environmental temperature, improve the heating rate and the highest composting temperature of the ultra-high temperature composting process, and thus promote the ripening of the compost, improve the composting efficiency, and shorten the composting time;

[0076] After the ultra-high temperature composting process is completed, the present invention chemically oxidizes the sludge by means of ultraviolet irradiation and ozone aeration. The treatment method of coupling biological composting with chemical oxidation further improves the removal rate of CPAM in the sludge. In addition, ultraviolet irradiation and ozone aeration can efficiently kill the pathogenic microorganisms in the compost heap and improve the biological safety of the product.

[0077] The present invention organically combines biological composting + chemical oxidation + physical compression. While efficiently degrading CPAM and realizing the resource utilization of sludge, it maximally reduces the moisture content of the product, reduces the volume of the product, facilitates the transportation and storage of the product, and realizes the stabilization, reduction, and resource utilization of the sludge.

[0078] Third, as the creative auxiliary evidence of the claims of the present invention, it is also reflected in the following important aspects:

[0079] (1) The expected benefits and commercial value after the transformation of the technical solution of the present invention are as follows: The scale of sewage treatment in China is continuously increasing, and the sludge output is also increasing sharply. A large amount of CPAM enters the environment and exists for a long time during the sludge disposal process, posing a serious threat to the health of residents and environmental protection. Therefore, the treatment of sludge containing CPAM has a huge market demand and good market prospects.

[0080] The research and application of environmentally friendly, economical, and efficient sludge containing CPAM can effectively reduce the pollution of CPAM in the sludge to the soil, groundwater, and surrounding environment, relieve the pressure on the environmental protection industry, improve the quality of the living environment of residents, and provide a good theoretical basis and technical support for the treatment of other organic waste.

[0081] From the perspective of energy conservation and emission reduction, the sludge treated by the method and device of the present invention can be safely used for land use and landfill, and can be used for building materials production to achieve resource utilization, which helps sewage treatment plants reduce operating costs and improve operating efficiency.

[0082] (2) The present invention organically combines biological composting, chemical oxidation, and physical compression. While efficiently degrading CPAM and realizing sludge resource utilization, it realizes the stabilization, reduction, and resource utilization of sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0084] Figure 1 is a flowchart of the method for treating sludge containing polyacrylamide provided by an embodiment of the present invention;

[0085] Figure 2 is a schematic diagram of ultra-high temperature aerobic composting provided by an embodiment of the present invention;

[0086] Figure 3 is provided by an embodiment of the present invention Figure 2 The temperature curve graph of the composting process is successively divided into a heating period, an ultra-high temperature period, a high temperature period, and a maturity period;

[0087] Figure 4 is a schematic diagram of the system for treating sludge containing polyacrylamide provided by an embodiment of the present invention;

[0088] Figure 5 is a top view of the annular aeration pipeline at the bottom of the composting reactor provided by an embodiment of the present invention;

[0089] Figure 6 is a cross-sectional view of the annular aeration pipeline at the bottom of the composting reactor provided by an embodiment of the present invention;

[0090] Figure 7 is a top view of the load-bearing sieve plate at the bottom of the composting reactor provided by an embodiment of the present invention;

[0091] Figure 8 is a bottom view of the load-bearing sieve plate at the bottom of the composting reactor provided by an embodiment of the present invention;

[0092] Figure 9 is a schematic diagram of the moisture content adjustment device and the bacterial agent quantitative addition device provided by an embodiment of the present invention;

[0093] Figure 10 is a schematic diagram of the compression disc provided by an embodiment of the present invention;

[0094] Figure 11It is a schematic diagram of the nut at the center of the compressed disk provided by an embodiment of the present invention;

[0095] Figure 12 It is a schematic connection diagram of the activated carbon ozone / ultrasonic activation regeneration device provided by an embodiment of the present invention;

[0096] Figure 13 It is a comparison diagram between the multi-stage inoculation ultra-high temperature aerobic composting process provided by an embodiment of the present invention and the prior art;

[0097] Figure 14 It is a schematic diagram of the removal rate of CPAM during the operational composting process with multi-stage inoculation provided by an embodiment of the present invention;

[0098] Figure 15 It is a comparison diagram of the removal effects of CPAM in sludge under different treatment conditions provided by an embodiment of the present invention;

[0099] In the figure: 1. Water storage tank; 2. Water pump; 3. Activated carbon ozone / ultrasonic activation regeneration device; 3-1. Ozone aeration disk; 3-2. Washing liquid outlet; 3-3. Ultrasonic device; 4. Ozone generator; 5. Air pump; 6. Gas temperature regulation and control device; 7. Gas flowmeter; 8. Temperature and moisture content monitoring instrument; 8-1. Temperature and moisture content monitoring terminal; 8-2. Compost tank; 8-3. Temperature and moisture content detection sensor; 9. Aeration device at the bottom of the compost reactor; 9-1. Aeration annular pipe at the bottom of the compost reactor; 9-1-1. Air holes in the aeration annular pipe; 9-2. Pressure-bearing sieve plate; 9-2-1. Support leg; 9-2-2. Pressure sensor; 10. Moisture content adjustment device; 10-1. Driver; 10-2. Stirring spiral belt; 10-3. Stirring screw; 10-4. Water outlet; 11. Water temperature adjustment device; 12. Bacterial agent quantitative addition device; 13. Bacterial agent storage device; 14. Ultraviolet lamp; 15. Check valve; 16. Exhaust gas vent hole; 17. Exhaust gas purification device; 18. Chemical addition hole; 19. Compressed disk; 19-1. Nut; 20. Constant temperature circulating water bath system. Detailed implementation manners

[0100] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0101] In the present invention, acrylamide polymers are the general terms for homopolymers and copolymers of acrylamide (AM) monomers. Generally, polymers with an AM monomer content exceeding 50% are collectively referred to as polyacrylamide (PAM). According to the ionization property of PAM in aqueous solution, it can be divided into non-ionic polyacrylamide (NPAM), cationic polyacrylamide (CPAM), anionic polyacrylamide (HPAM), and amphoteric ion polyacrylamide (ACPAM).

[0102] I. Explanation of the embodiments:

[0103] Example 1

[0104] As Figure 1 shown, the method for treating sludge containing polyacrylamide provided by the embodiment of the present invention includes the following steps:

[0105] Step 1: Strengthen the inoculation of CPAM-degrading functional bacteria and extreme thermophilic bacteria at different stages of high-temperature aerobic composting respectively, construct a new multi-stage enhanced ultra-high-temperature aerobic composting system for CPAM-degrading functional bacteria, and perform ultra-high-temperature aerobic composting on the sludge containing CPAM;

[0106] Step 2: Perform ozone aeration and ultraviolet irradiation treatment on the composting products of ultra-high-temperature aerobic composting to deeply remove CPAM by chemical oxidation;

[0107] Step 3: Compress and dehydrate the chemical oxidation products to reduce the moisture content and obtain a resource product.

[0108] Step 4: Perform ozone / ultrasonic activation treatment on the used activated carbon to restore its activity for use in the next sludge treatment cycle.

[0109] Example 2

[0110] Based on the method for treating sludge containing polyacrylamide provided in Example 1 of the present invention, in order to improve the activity of functional bacteria and the degradation efficiency of CPAM, the embodiment of the present invention strengthens the inoculation according to the temperature change situation in different composting stages and the optimal temperature range of different functional bacteria.

[0111] As Figure 2 shown, in Step 1, strengthen the inoculation of CPAM-degrading functional bacteria and extreme thermophilic bacteria (commercially available) at different stages of high-temperature aerobic composting respectively, construct a new multi-stage enhanced ultra-high-temperature aerobic composting system for CPAM-degrading functional bacteria, and perform ultra-high-temperature aerobic composting on the sludge containing CPAM, so that the compost pile is rich in highly efficient CPAM-degrading functional bacteria in different composting stages.

[0112] Figure 3In the process, during the entire composting cycle, the temperature of the compost pile first rises and then decreases. The composting process can be sequentially divided into a temperature-rising stage, an ultra-high temperature stage, a high temperature stage, and a maturity stage. The specific steps are as follows:

[0113] During the temperature-rising stage of composting, when the temperature rises to 35°C, the CPAM-degrading functional bacterium agent A (one or more of Bacillus megaterium, Bacillus cereus, Bacillus subtilis, and Cellulomonas flavigena) is added through the medicine adding hole 18 by the bacterium agent metering and adding device 12, and the dosage is 0.01% - 5% (mass fraction) of the CPAM-containing sludge.

[0114] During the ultra-high temperature stage of composting, when the temperature rises to 65°C, the extreme thermophilic bacterium agent (one or more of Calditerricola yamamurae, Calditerricola satsumensis, and Thermusthermophilus) is added through the medicine adding hole 18 by the bacterium agent metering and adding device 12, and the dosage is 0.01% - 3% (mass fraction) of the CPAM-containing sludge.

[0115] During the high temperature stage of composting, when the temperature drops to 55°C, the CPAM-degrading functional bacterium agent B (one or more of Bacillus megaterium, Bacillus coagulans, and Bacillus licheniformis) is added through the medicine adding hole 18 by the bacterium agent metering and adding device 12, and the dosage is 0.01% - 5% (mass fraction) of the CPAM-containing sludge.

[0116] During the maturity stage of composting, when the temperature drops to 30°C, the CPAM-degrading functional bacterium agent C (one or more of Streptomyces griseorubens, Bacillus megaterium, and Bacillus subtilis) is added through the medicine adding hole 18 by the bacterium agent metering and adding device 12, and the dosage is 0.01% - 5% (mass fraction) of the CPAM-containing sludge.

[0117] In the embodiments of the present invention, the added bacterium agent is an enrichment culture solution of a single strain or a mixed strain (the bacterial concentration is 1 - 7×10 8 CFU / mL).

[0118] In the embodiments of the present invention, the synergistic effect of ultra-high temperature aerobic composting and multi-stage enhanced inoculation of highly efficient degrading functional bacteria realizes the efficient degradation of CPAM in the sludge and the resource utilization of the sludge itself.

[0119] In view of the high stability of the molecular structure of CPAM and the limitation of biodegradation, the ultra-high temperature composting products are further treated by ozone aeration and ultraviolet irradiation. By coupling biological degradation and chemical oxidation organically, the maximum removal of CPAM in sludge is achieved.

[0120] Example 3

[0121] Based on the method for treating sludge containing polyacrylamide provided in Example 1 of the present invention, in Step 2, while performing ozone aeration, the stirring device and the ultraviolet irradiation lamp are turned on to uniformly irradiate the composting products. The synergistic effect of ozone oxidation and ultraviolet irradiation realizes the efficient chemical oxidation of the residual CPAM in the composting products.

[0122] Example 4

[0123] Based on the method for treating sludge containing polyacrylamide provided in Example 1 of the present invention, in Step 3, after the treatment, the activated carbon (oak activated carbon, coconut shell activated carbon, columnar activated carbon) is ultrasonically regenerated.

[0124] Example 5

[0125] In the method for treating sludge containing polyacrylamide provided in Example 1 of the present invention, on the basis of the ultra-high temperature aerobic composting method, the sludge containing CPAM is composted by adopting a method of multi-stage enhanced inoculation of CPAM-degrading functional bacteria.

[0126] The sludge after composting treatment is subjected to ozone aeration and ultraviolet irradiation, realizing the coupling of biological degradation and chemical oxidation, and further improving the degradation rate of CPAM. In addition, the ozone aeration process and the ultraviolet irradiation treatment completely kill the pathogenic microorganisms in the composting products, greatly improving the biological safety of the products.

[0127] As Figure 4 shown, the system for treating sludge containing polyacrylamide provided in Example 1 of the present invention includes:

[0128] A novel multi-stage enhanced ultra-high temperature aerobic composting system for CPAM-degrading functional bacteria, which is used to shorten the composting time, promote compost maturity, ensure the activity of CPAM-degrading functional bacteria, and improve the efficiency of microbial degradation of CPAM in sludge.

[0129] A chemical oxidation system, which is used for the deep removal of the residual CPAM in the composting products after ultra-high temperature composting and efficiently killing the pathogenic microorganisms in the composting products;

[0130] A physical compression system: which is used for the further dehydration of the chemical oxidation products to obtain resource-based products;

[0131] An activated carbon regeneration system: which is used for the activation regeneration and reuse of activated carbon.

[0132] In an embodiment of the present invention, the novel CPAM-degrading functional bacteria multi-stage enhanced ultra-high temperature aerobic composting system includes:

[0133] A water storage tank 1, which is connected to a water temperature regulating device 11 through a water pump 2; the water temperature regulating device 11 is connected to a moisture content regulating device 10; the moisture content regulating device 10 is installed inside a temperature and moisture content monitoring instrument 8;

[0134] The temperature and moisture content monitoring instrument 8 is connected to a bacterial agent quantitative addition device 12 through a chemical addition hole 18, and the bacterial agent quantitative addition device 12 is connected to a temperature and moisture content monitoring system through a wire.

[0135] A compost reactor bottom aeration device 9 installed inside a compost tank 8-2 and connected to a gas flow meter 7;

[0136] The shell of the compost tank 8-2 is a double-shell structure inside and outside, and the inner and outer shells form a space for circulating water (oil) to flow. The inlet and outlet of the circulating water are respectively connected to a constant temperature circulating water bath system 20 through water pipes;

[0137] The compost reactor bottom aeration device 9 includes a compost reactor bottom aeration annular pipe 9-1; aeration annular pipe air holes 9-1-1 are opened on the compost reactor bottom aeration annular pipe 9-1, and gaskets are arranged below different positions of the compost reactor bottom aeration annular pipe 9-1;

[0138] A pressure-bearing sieve plate 9-2 is arranged above the compost reactor bottom aeration annular pipe 9-1, and support legs 9-2-1 are arranged at the edge of the sieve plate of the pressure-bearing sieve plate 9-2;

[0139] The temperature and moisture content monitoring system includes a temperature and moisture content monitoring terminal 8-1, sensors 8-3 for detecting the temperature and moisture content at different positions of the upper, middle, and bottom inside the compost tank 8-2, and a moisture content regulating device 10;

[0140] The sensors 8-3 transmit the temperature and moisture content of different positions of the compost body detected to the moisture content monitoring terminal 8-1 for display and recording;

[0141] The moisture content regulating device 10 includes a driver 10-1, a stirring spiral belt 10-2, and a stirring screw 10-3;

[0142] The driver 10-1 is installed above the tank cover 8-2-1 of the compost tank 8-2; the stirring spiral belt 10-2 and the stirring screw 10-3 are located below the tank cover 8-2-1 of the compost tank 8-2;

[0143] The stirring spiral belt 10-2 is divided into upper, middle, and bottom sections, and the independent rotation and linkage rotation of different stirring spiral belts 10-2 are realized through a disassembly and separation method;

[0144] Different sections of the stirring spiral belts 10-2 are separated from each other by spaces provided with water outlets 10-4 at different positions for water flow; the water outlets 10-4 are connected to the water temperature regulating device 11; and the water outlets 10-4 are operated independently and in conjunction with each other as required.

[0145] Chemical oxidation systems include:

[0146] A composting reactor bottom aeration device 9 installed inside the composting tank 8-2 and connected to a gas flow meter 7;

[0147] The compost reactor bottom aeration device 9 comprises a compost reactor bottom aeration annular pipe 9-1; the reactor bottom aeration annular pipe 9-1 is provided with aeration annular pipe air holes 9-1-1, and gaskets are arranged below different positions of the compost reactor bottom aeration annular pipe 9-1;

[0148] A pressure-bearing sieve plate 9-2 is arranged above the aeration annular pipe 9-1 at the bottom of the composting reactor, and a supporting leg 9-2-1 is arranged at the edge of the pressure-bearing sieve plate 9-2;

[0149] The chemical oxidation system also includes an ozone generator 4 connected to a gas temperature regulating control device 6, which is connected to an aeration annular pipe 9-1 at the bottom of the composting reactor through a connected gas flow meter 7;

[0150] The chemical oxidation system also includes: an ultraviolet lamp 14 is arranged under the tank cover 8-2-1 to irradiate the pile.

[0151] The physical compression system includes:

[0152] After removing the stirring belt 10-2 and the stirring screw 10-3, the compression plate 19 is installed on the driver 10-1 by bolts. The compression plate 19 is driven by the driver 10-1 to move up and down to perform high-pressure compression and dehydration on the pile.

[0153] A pressure sensor 9-2-2 is fixed on the upper surface of the pressure sieve plate 9-2, which is used to monitor the pressure on the pressure sieve plate 9-2 and the bottom of the compost tank 8-2 during the physical compression process. When the pressure reaches the set value, the pressure sensor 9-2-2 feeds back a wireless signal to control the driver 10-1 in the moisture content regulating device 10 to stop running;

[0154] The activated carbon regeneration system comprises: an activated carbon ozone / ultrasonic activation regeneration device 3 connected to an ozone generator 4 for performing ozone / ultrasonic regeneration on the used activated carbon.

[0155] Example 6

[0156] The system for treating sludge containing polyacrylamide includes:

[0157] The water storage tank 1 is connected to the activated carbon ozone / ultrasonic activation regeneration device 3 through a water pump 2. The activated carbon ozone / ultrasonic activation regeneration device 3 includes an ultrasonic device 3-3. An ozone aeration disk 3-1 is installed in the ultrasonic device 3-3, and a washing liquid outlet 3-2 is externally connected.

[0158] The activated carbon ozone / ultrasonic activation regeneration device 3 is also connected to an ozone generator 4;

[0159] The air pump 5 is also connected to a gas temperature regulation and control device 6. The gas temperature regulation and control device 6 is connected to a gas flow meter 7. The gas flow meter 7 is connected to the bottom aeration annular pipe 9-1 of the compost reactor;

[0160] The temperature and moisture content monitoring instrument 8 includes a temperature and moisture content monitoring terminal 8-1; Temperature and moisture content detection sensors 8-3 are installed at different positions on the upper, middle, and bottom inside the compost tank 8-2; The temperature and moisture content of different positions of the compost pile body detected are transmitted to the monitoring terminal 8-1 for display;

[0161] A compost reactor bottom aeration device 9 connected to the gas flow meter 7 is also installed inside the compost tank 8-2;

[0162] A constant temperature circulating water bath system 20 is also installed outside the compost tank 8-2;

[0163] The compost reactor bottom aeration device 9 includes a compost reactor bottom aeration annular pipe 9-1 (as Figure 5 、 Figure 6 shown); The inner and outer two annular aeration pipes of the reactor bottom aeration annular pipe 9-1 are connected by 4 pipes, and the 4 pipes communicate at the center; To prevent the fine materials of the compost from falling into the aeration annular pipe pores 9-1-1, the aeration annular pipe pores 9-1-1 are uniformly vertically downward; To prevent the downward aeration annular pipe pores 9-1-1 from being blocked by the bottom surface of the compost tank 8-2, gaskets (not shown) are provided below eight different positions of the compost reactor bottom aeration annular pipe 9-1 to appropriately raise the height (1 - 5 cm) of the compost reactor bottom aeration annular pipe 9-1;

[0164] As Figures 7 - 8 shown, to prevent the compost reactor bottom aeration annular pipe 9-1 from directly bearing pressure, a pressure-bearing sieve plate 9-2 is provided above the compost reactor bottom aeration annular pipe 9-1. Twelve support legs 9-2-1 are provided at the edge of the sieve plate of the pressure-bearing sieve plate 9-2 (as Figure 8 ), to support its own weight and the pressure above;

[0165] The load-bearing sieve plate is provided with 500 - 300 pores (pore diameter 0.5 - 3 mm) to allow the gas in the compost reactor bottom aeration annular pipe 9-1 to uniformly enter the compost body;

[0166] Five pressure sensors 9-2-2 are fixed on the upper surface of the pressure-bearing sieve plate 9-2 (as Figure 7 ), which are used to monitor the pressure borne by the pressure-bearing sieve plate 9-2 and the bottom of the compost tank 8-2 during the physical compression process. When the pressure reaches the set value, the pressure sensor 9-2-2 feeds back a wireless signal to control the driver 10-1 in the moisture content adjustment device 10 to stop running.

[0167] As Figure 9 shown, a moisture content adjustment device 10 is installed inside the compost tank 8-2; the moisture content adjustment device 10 is connected to the water pump 2 through a water temperature adjustment device 11;

[0168] The moisture content adjustment device 10 includes a driver 10-1, a stirring spiral ribbon 10-2, and a stirring screw 10-3;

[0169] The driver 10-1 is installed above the tank cover of the compost tank 8-2; the stirring spiral ribbon 10-2 and the stirring screw 10-3 are located below the tank cover 8-2-1 of the compost tank 8-2;

[0170] Exemplarily, the stirring spiral ribbon 10-2 is divided into upper, middle, and bottom sections, and the independent rotation and linkage rotation of different stirring spiral ribbons 10-2 are realized through a disassembly and separation method; to improve the stirring efficiency, the stirring spiral ribbon 10-2 and the stirring screw 10-3 can rotate forward and backward, and can be adjusted as needed within the rotational speed range of 0 to 200 rpm.

[0171] In an embodiment of the present invention, the stirring spiral ribbons 10-2 in different sections are provided with water outlets 10-4 at different positions through which water flow (pure water or other aqueous solutions) passes; the water outlets 10-4 are connected to the water temperature adjustment device 11; and the water discharged from the water outlets 10-4 can operate independently and in linkage as needed.

[0172] The water outlets 10-4 are arranged at the upper, middle, and bottom of the stirring spiral ribbon 10-2, which is beneficial to adjusting the moisture content in the vertical direction of the compost heap targeted. And the water outlets 10-4 are arranged on both the stirring spiral ribbon 10-2 and the stirring screw 10-3, which is beneficial to the uniform distribution of moisture in the horizontal direction; during the composting process, since the moisture in the compost heap rises with the hot air flow, it is easy to cause the moisture content in the upper part of the compost heap to be higher than that in the bottom. In the embodiment of the present invention, the moisture content at different positions in the compost tank 8-2 can be monitored independently, and according to the moisture content at different positions, the water in the compost heap is supplemented through the water outlets 10-4 at different positions, avoiding the uneven moisture supplement of the compost heap caused by the traditional top-down spraying water replenishment method.

[0173] Exemplarily, before the supplementary water enters the compost tank 8-2, it is first input into the water temperature adjustment device 11 by the water pump 2, and the water temperature is adjusted to be less than 0.1 °C different from the temperature of the compost heap, so as to prevent the supplementary water from absorbing a large amount of heat from the compost heap and causing a temperature drop.

[0174] As Figure 9 shown, an exhaust gas vent hole 16 is also provided on the lid 8-2-1 of the compost tank 8-2; the exhaust gas vent hole 16 communicates with an external exhaust gas purification device 17;

[0175] A chemical addition hole 18 is also provided on the lid 8-2-1; the chemical addition hole 18 is connected to a bacterial agent quantitative addition device 12 through a pipeline, and the bacterial agent quantitative addition device 12 is connected to a temperature and moisture content monitoring instrument 8 through a wire;

[0176] and is connected to a bacterial agent storage device 13 through a pipeline. The bacterial agent storage device 13 stores extreme thermophilic bacterial agents, CPAM degradation functional bacterial agent A, CPAM degradation functional bacterial agent B, and CPAM degradation functional bacterial agent C.

[0177] The extreme thermophilic bacterial agents include one or more of Calditerricola yamamurae, Calditerricola satsumensis, and Thermus thermophilus; CPAM degradation functional bacterial agent A includes one or more of Bacillus megaterium, Bacillus cereus, Bacillus subtilis, and Cellulomonas flavigena; CPAM degradation functional bacterial agent B includes one or more of Bacillus megaterium, Bacillus coagulans, and Bacillus licheniformis; CPAM degradation functional bacterial agent C includes one or more of Streptomyces griseorubens, Bacillus megaterium, and Bacillus subtilis.

[0178] The above-mentioned bacterial agents are all composed of one or more bacteria, and the bacteria are all purchased from the China Center for Industrial Culture Collection and Mingzhou Biotechnology Co., Ltd.

[0179] Exemplarily, a check valve 15 is provided in the exhaust gas vent hole 16, which only allows gas to flow from the inside of the tank body of the compost tank 8-2 to the outside;

[0180] The exhaust gas vent hole 16 is connected to the exhaust gas purification device 17, which is used to treat and purify gases such as ammonia generated in the ultra-high temperature composting stage and excess ozone gas in the ozone aeration stage;

[0181] Below the can lid 8-2-1, there is an ultraviolet lamp 14, whose power can be adjusted as needed within the range of 0.5 to 10 KW. During the chemical oxidation stage, the moisture content adjustment device 10, the ozone generator 4 and the ultraviolet lamp 14 are turned on simultaneously to perform ultraviolet irradiation and ozone aeration on the compost heap, and the ozone aeration volume is 5 to 40 g / h.

[0182] Example 7

[0183] As Figures 10 - 11 shown, after the composting, ozone aeration and ultraviolet irradiation treatment are completed, the moisture content of the compost product is still relatively high (40% - 60%), which is not conducive to transportation and storage. Therefore, it is necessary to further adjust the moisture content of the product according to the actual situation.

[0184] In this embodiment of the present invention, after the composting, ozone aeration and ultraviolet irradiation treatment are completed, the stirring spiral ribbon 10-2 is removed and the compression disc 19 is installed. A nut 19-1 is provided at the center of the compression disc 19; the compression disc 19 can move up and down under the drive of the driver 10-1. During the downward movement, high-pressure compression dehydration is performed on the compost heap to further reduce the moisture content to 20% - 30%.

[0185] The water seeping out of the compost heap during the compression process can be discharged outside from the bottom of the compost tank 8-2.

[0186] Example 8

[0187] During the composting stage, in order to increase the contact area of the gas-liquid two-phase, improve the porosity of the compost heap, and promote the metabolism and reproduction of microorganisms, a certain amount of block activated carbon (one or several of oak activated carbon, coconut shell activated carbon, columnar activated carbon, etc.) is added to the compost heap.

[0188] During the chemical oxidation stage, the activated carbon in the compost heap can increase the contact area between ozone and pollutants and improve the oxidation efficiency of ozone.

[0189] After the physical compression is completed, the activated carbon is recovered from the product and regenerated.

[0190] Exemplarily, as Figure 12 shown, the used activated carbon is transferred to the activated carbon ozone / ultrasonic activation regeneration device 3, and 3 to 4 times the volume of water is added. At the same time, the activated carbon ozone / ultrasonic activation regeneration device 3 and the ozone generator 4 are turned on to perform ozone / ultrasonic regeneration on the activated carbon.

[0191] The ultrasonic power is 100 to 8000 W, the ozone aeration volume is 5 to 70 g / h, the time is controlled within 10 to 30 min, the ozone aeration disc 3-1 is made of titanium alloy or inorganic ceramic material, and is distributed with 5000 to 30000 micropores, and the micropore diameter is 10 to 100 μm.

[0192] After the activated carbon is regenerated by ozone / ultrasonic treatment, the activated carbon can be recycled.

[0193] In the embodiment of the present invention, lump-shaped activated carbon is added to the heap body. To improve economic efficiency and reduce treatment costs, an activated carbon ozone / ultrasonic regeneration device and steps are set, which maximally ensure the recycling of activated carbon.

[0194] In the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0195] II. Evidence of the related effects of the embodiments:

[0196] Experiment

[0197] As Figure 13 shown, the heating rate of the existing ultra-high temperature aerobic composting is much higher than that of ordinary aerobic composting, and the maximum temperature of the heap body exceeds 80 °C, which is much higher than that of ordinary aerobic composting. In addition, compared with ordinary aerobic composting, the ultra-high temperature aerobic composting cycle is shorter, and it can reach maturity in about 50 days.

[0198] In the process of multi-stage inoculation ultra-high temperature aerobic composting provided by the embodiment of the present invention, when the temperature of the heap body exceeds 65 °C, extreme thermophilic bacteria agents are added. Compared with adding at room temperature at the initial stage of composting, the heating rate of the heap body is faster. The maximum temperature of the heap body in multi-stage inoculation ultra-high temperature aerobic composting exceeds 85 °C, while the maximum temperature of the heap body in ordinary ultra-high temperature aerobic composting is less than 82 °C. The higher temperature also makes the cycle of multi-stage inoculation ultra-high temperature aerobic composting shorter.

[0199] As Figure 14 shown, the operation of multi-stage inoculation provided by the embodiment of the present invention fully ensures the activity of various CPAM-degrading functional bacteria, thereby improving the removal rate of CPAM in the composting process.

[0200] The maximum removal rate of CPAM in multi-stage inoculation ultra-high temperature aerobic composting exceeds 79%, while the maximum removal rate of CPAM in ordinary ultra-high temperature composting is less than 65%.

[0201] As Figure 15 shown, to further improve the removal rate of CPAM, after the composting process is completed, the heap body is irradiated with ultraviolet light and aerated with ozone, and the small amount of residual CPAM in the heap body is completely removed under the combined action of ozone and ultraviolet light.

[0202] The above is only the relatively preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for treating sludge containing polyacrylamide, characterized in that, The method comprises the following steps: Step 1: Strengthened inoculation of CPAM-degrading functional bacteria and extreme thermophiles is carried out at different stages of high-temperature aerobic composting respectively to construct a multi-stage enhanced ultra-high-temperature aerobic composting system of CPAM-degrading functional bacteria, and ultra-high-temperature aerobic composting is carried out on the sludge containing CPAM. Activated carbon is added to the ultra-high-temperature aerobic composting system; Step 2: Ozone aeration and ultraviolet irradiation treatment are carried out on the composting products of ultra-high-temperature aerobic composting for deep chemical oxidation removal of CPAM; Step 3: Compression dehydration is carried out on the chemical oxidation products to reduce the moisture content and obtain a resource product; Step 4: Ozone / ultrasonic activation treatment is carried out on the used activated carbon to restore the activity of the activated carbon for use in the next sludge treatment cycle; In Step 1, strengthened inoculation of CPAM-degrading functional bacteria and extreme thermophiles is carried out at different stages of high-temperature aerobic composting respectively to construct a multi-stage enhanced ultra-high-temperature aerobic composting system of CPAM-degrading functional bacteria, which includes the following steps: During the composting temperature-rising period, when the temperature rises to 35 °C, the CPAM-degrading functional bacterium agent A is added through the medicine adding hole (18) by the bacterium agent quantitative adding device (12), and the dosage is 0.01%-5% of the mass fraction of the sludge containing CPAM; The CPAM-degrading functional bacterium agent A includes one or more of Bacillus megaterium, Bacillus cereus, Bacillus subtilis, and Cellulomonas flavigena; During the ultra-high temperature period of composting, when the temperature rises to 65 °C, the extreme thermophile agent is added through the medicine adding hole (18) by the bacterium agent quantitative adding device (12), and the dosage is 0.01%-3% of the mass fraction of the sludge containing CPAM; The extreme thermophile agent includes one or more of Calditerricola yamamurae, Calditerricola satsumensis, and Thermus thermophilus; During the high temperature period of composting, when the temperature drops to 55 °C, the CPAM-degrading functional bacterium agent B is added through the medicine adding hole (18) by the bacterium agent quantitative adding device (12), and the dosage is 0.01%-5% of the mass fraction of the sludge containing CPAM; The CPAM-degrading functional bacterium agent B includes one or more of Bacillus megaterium, Bacillus coagulans, and Bacillus licheniformis; During the composting maturity period, when the temperature drops to 30 °C, the CPAM-degrading functional bacterium agent C is added through the medicine adding hole (18) by the bacterium agent quantitative adding device (12), and the dosage is 0.01%-5% of the mass fraction of the sludge containing CPAM; The CPAM-degrading functional bacterium agent C includes one or more of Streptomyces griseorubens, Bacillus megaterium, and Bacillus subtilis; The bacterial concentrations of the CPAM-degrading functional bacterium agent A, the extreme thermophilic bacterium agent, the CPAM-degrading functional bacterium agent B, and the CPAM-degrading functional bacterium agent C are all 1 - 7×10 8 CFU / mL.

2. The method for treating polyacrylamide-containing sludge according to claim 1, wherein In step four, the activated carbon includes one of oak activated carbon, coconut shell activated carbon, and columnar activated carbon.

3. The method for treating polyacrylamide-containing sludge according to claim 1, wherein In step three, after the stack removed by CPAM is compressed and dehydrated, it returns to step one for circulation; After compression and dehydration, an activated carbon ozone / ultrasonic activation regeneration device (3) is used for activated carbon ozone / ultrasonic activation regeneration.

4. A system for treating polyacrylamide-containing sludge by implementing the method for treating polyacrylamide-containing sludge according to any one of claims 1-3, characterized in that, The system for treating sludge containing polyacrylamide includes: A CPAM-degrading functional bacteria multi-stage enhanced ultra-high temperature aerobic composting system, which is used to shorten the composting time, promote compost maturity, ensure the activity of CPAM-degrading functional bacteria, and improve the degradation efficiency of CPAM in sludge; A chemical oxidation system, which is used for the deep removal of residual CPAM in the compost product after ultra-high temperature composting and efficiently killing pathogenic microorganisms in the compost product; A physical compression system, which is used for further dehydration of the chemical oxidation product to obtain a resource product; An activated carbon regeneration system, which is used for the activation regeneration and reuse of activated carbon; The ultra-high temperature aerobic composting system includes a composting tank (8-2). A medicine adding hole (18) is opened on the lid of the composting tank (8-2); the medicine adding hole (18) is connected to a bacterial agent quantitative adding device (12) through a pipeline; the bacterial agent quantitative adding device (12) is connected to a bacterial agent storage device (13) through a pipeline. The bacterial agent storage device (13) stores extreme thermophilic bacterial agents, CPAM-degrading functional bacterial agent A, CPAM-degrading functional bacterial agent B, and CPAM-degrading functional bacterial agent C.

5. The system for treating sludge containing polyacrylamide according to claim 4, wherein The CPAM-degrading functional bacteria multi-stage enhanced ultra-high temperature aerobic composting system includes: A water storage tank (1), which is connected to a water temperature regulating device (11) through a water pump (2): A temperature and moisture content monitoring instrument (8), which includes a temperature and moisture content monitoring terminal (8-1), a composting tank (8-2), and a moisture content regulating device (10); The shell of the composting tank (8-2) is a double-shell structure inside and outside. The inner and outer shells form a space for circulating water flow. The inlet and outlet of the circulating water are respectively connected to a constant temperature circulating water bath system (20) through water pipes; A moisture content regulating device (10) is installed inside the composting tank (8-2), and the water temperature regulating device (11) is connected to the moisture content regulating device (10); A compost reactor bottom aeration device (9) connected to a gas flow meter (7) is installed inside the composting tank (8-2) of the temperature and moisture content monitoring instrument (8); The compost reactor bottom aeration device (9) includes a compost reactor bottom aeration annular pipe (9-1); aeration annular pipe air holes (9-1-1) are opened on the reactor bottom aeration annular pipe (9-1), and gaskets are arranged below different positions of the compost reactor bottom aeration annular pipe (9-1); A pressure-bearing sieve plate (9-2) is arranged above the compost reactor bottom aeration annular pipe (9-1), and support legs (9-2-1) are arranged at the edge of the sieve plate of the pressure-bearing sieve plate (9-2).

6. The system for treating sludge containing polyacrylamide according to claim 5, wherein, Sensors (8-3) for detecting the temperature and moisture content at different positions are installed at different positions of the upper, middle, and bottom inside the composting tank (8-2); The sensor (8-3) transmits the temperatures and moisture contents at different positions of the compost pile detected to the moisture content monitoring terminal (8-1) for display and recording; The moisture content adjusting device (10) includes a driver (10-1), a stirring spiral ribbon (10-2), and a stirring screw (10-3); The driver (10-1) is installed above the tank cover (8-2-1) of the compost tank (8-2); the stirring spiral ribbon (10-2) and the stirring screw (10-3) are located below the tank cover (8-2-1) of the compost tank (8-2); The stirring spiral ribbon (10-2) and the stirring screw (10-3) are divided into upper, middle, and bottom sections, and the independent rotation and linkage rotation of different ribbon sections are achieved through a disassembly and separation method; The stirring spiral ribbon (10-2) and the stirring screw (10-3) in different sections are each provided with water outlets (10-4) at different positions through which water flows; The water outlets (10-4) are communicated with the water temperature adjusting device (11); and the water discharged from the water outlets (10-4) operates independently and in linkage as required.

7. The system for treating sludge containing polyacrylamide according to claim 4, wherein The chemical oxidation system includes: The compost reactor bottom aeration device (9) installed inside the compost tank (8-2) and connected to the gas flow meter (7); The compost reactor bottom aeration device (9) includes a compost reactor bottom aeration annular pipe (9-1); the aeration annular pipe pores (9-1-1) are formed on the compost reactor bottom aeration annular pipe (9-1), and gaskets are arranged below different positions of the compost reactor bottom aeration annular pipe (9-1); A pressure-bearing sieve plate (9-2) is arranged above the compost reactor bottom aeration annular pipe (9-1), and support legs (9-2-1) are arranged at the edge of the sieve plate of the pressure-bearing sieve plate (9-2); The chemical oxidation system further includes an ozone generator (4), the ozone generator (4) is connected to the gas temperature adjustment control device (6), and the gas temperature adjustment control device (6) is connected to the compost reactor bottom aeration annular pipe (9-1) through the connected gas flow meter (7); The chemical oxidation system further includes: an ultraviolet lamp (14) arranged below the tank cover (8-2-1) for irradiating the compost pile.

8. The system for treating sludge containing polyacrylamide according to claim 4, wherein The physical compression system includes: After removing the stirring spiral ribbon (10-2) and the stirring screw (10-3), a compression disc (19) is installed on the driver (10-1) through bolts. The compression disc (19) moves up and down under the drive of the driver (10-1) to perform high-pressure compression dehydration on the compost pile; A pressure sensor (9-2-2) is fixed on the upper surface of the pressure-bearing sieve plate (9-2) to monitor the pressures borne by the pressure-bearing sieve plate (9-2) and the bottom of the compost tank (8-2) during the physical compression process. When the pressure reaches the set value, the pressure sensor (9-2-2) feeds back a wireless signal to control the driver (10-1) in the moisture content adjusting device (10) to stop operating.

9. The system for treating sludge containing polyacrylamide according to claim 4, wherein The activated carbon regeneration system includes: an activated carbon ozone / ultrasonic activation regeneration device (3) communicated with the ozone generator (4) for ozone / ultrasonic regeneration of the used activated carbon.

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