CN116813160B - Sludge carbon sequestration process, obtained product and application - Google Patents
Sludge carbon sequestration process, obtained product and application Download PDFInfo
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- CN116813160B CN116813160B CN202310319781.XA CN202310319781A CN116813160B CN 116813160 B CN116813160 B CN 116813160B CN 202310319781 A CN202310319781 A CN 202310319781A CN 116813160 B CN116813160 B CN 116813160B
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- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge carbon sealing process, an obtained product and application thereof, and belongs to the technical field of sludge solidification and stabilization treatment. The sludge carbon sealing and storing process provided by the invention comprises the following steps: the method comprises the steps of adopting natural cold conditions to freeze and dehydrate sludge, adding high-temperature fine aggregate into frozen sludge, sieving fine aggregate which does not enter the sludge through a vibrating sieve, heating again until the proportion of the fine aggregate reaches the set requirement, adding coarse aggregate, disinfectant, impervious agent, water reducing agent, air entraining agent, polyurethane cement complex and rock wool fiber in steps, stirring uniformly, filling into a mould, cold pressing for forming, filling into an anti-seepage and anti-corrosion geotechnical bag after curing for a certain time, vacuumizing, hot pressing and sealing, and finally deeply burying to realize carbon sealing of the sludge. The invention seals up the sludge and simultaneously seals up the carbon and recycles the resources, the materials are convenient to obtain, the environment is protected, and the sustainable development strategy is met.
Description
Technical Field
The invention relates to a sludge carbon sealing process, an obtained product and application thereof, and belongs to the technical field of sludge solidification and stabilization treatment.
Background
The sludge system in China has huge volume, and the rising trend of years is that a large amount of sludge with high water content and high organic matters cannot be properly treated, so that serious environmental problems are caused. Wherein global warming by carbon emissions is one of the global significant challenges facing today's human sustainable development.
In the sewage treatment process, various impurities in the sewage are dehydrated and concentrated into a semisolid state and then pass throughThe concentrate obtained after the fluid separation is sludge, and generally, about 5 to 8 tons of wet sludge can be separated by treating ten thousand cubic meters of domestic sewage. According to the IPCC recommended value, the organic matter content in the sludge is about 50%, the organic matter content in the actual domestic existing sludge is lower, the organic matter content in the actual dry sludge can be expected to be more than 40% after the sludge increment in order to obtain more bioenergy in the future, and the organic matter content in the actual dry sludge can be calculated according to the mass ratio (C 5 H 7 NO 2 ) It is expected that the equivalent of 22.8% carbon is 0.837 ton CO 2 /tDS. Although the traditional sludge incineration method has the advantages of small occupied area, high treatment efficiency and the like, a great deal of CO can be released in the incineration process due to the limitations of the prior incineration technology 2 And toxic gas, secondary pollution to the environment, and is unfavorable for realizing the aim of carbon neutralization. Therefore, if the carbon extremely contained in the sludge is sealed by a certain technological method, natural conditions and green energy sources are utilized as much as possible in the sealing process, excessive energy is not consumed, the waste aggregate and the added fiber can be fully recycled to improve the corresponding strength of the product, and the harmful substances in the sludge are prevented from being oozed out by adding the corresponding additive, so that pollution is reduced while the carbon in the sludge is effectively sealed, and the important contribution is made to realizing the aim of carbon neutralization.
Disclosure of Invention
The invention provides a sludge carbon sequestration process, an obtained product and application thereof, and aims to solve the problem of carbon emission in the existing sludge treatment process.
The technical scheme of the invention is as follows:
the invention aims to provide a sludge carbon sequestration process, which comprises the following steps:
s1, freezing raw sludge outdoors under the cold condition of below-5 ℃, and converting bound water in the sludge into interstitial water which is easy to remove through crystallization and wall breaking; heating the fine aggregate to 70-80 ℃ by using a solar heating device;
s2, rapidly adding high-temperature fine aggregate into frozen sludge, dehydrating the sludge while improving the melting rate of the sludge, sieving out the fine aggregate which is not mixed with the sludge through a vibrating sieve, heating again, circulating until the mass ratio of the fine aggregate reaches the design requirement, and then transferring the sludge fine aggregate mixture and the waste concrete coarse aggregate into a micro-negative pressure stirring device for uniform stirring;
s3, adding a disinfectant into the micro negative pressure device, stirring for 4-7min at a low speed, standing for 10-20min, adding an air entraining agent, an anti-permeability agent and a water reducing agent which are dissolved in water in advance while stirring, stirring for 3-5min at a high speed, adding a polyurethane cement complex, stirring for 3-5min at a low speed, adding rock wool fibers, and continuing stirring for 2-3min at a low speed, so that the rock wool fibers and various additives are uniformly distributed between the sludge fine aggregate and the waste concrete coarse aggregate;
s4, filling the sludge into a mold for cold compression molding to obtain a light sludge product with uniform closed bubbles inside, filling the sludge product into an anti-seepage and anti-corrosion geotechnical bag after curing for 28 days, vacuumizing, hot-pressing and sealing, and finally deeply burying the sludge product into a waste deep well and a deep pit for long-term sealing and storing, so that carbon in the sludge is effectively sealed and meanwhile collapse of the waste deep well and the deep pit is prevented.
Further limited, the cold press forming process in S4 is carried out twice, the pressure applied by the first cold press is 130-160MPa, and the cold press lasts for 2-4S; the pressure applied by the second cold pressing is 180-200MPa, and the cold pressing lasts for 3-6s.
Further limited, the raw sludge is dehydrated sludge produced by municipal sewage treatment plants and subjected to freeze thawing, and the water content is 80% -90%.
Further limited, the fine aggregate is natural medium-coarse river sand, the fineness modulus is 2.4-2.8, and the fine aggregate is heated to 70-80 ℃ by using a solar heating device.
Further limited, the waste concrete coarse aggregate is obtained by crushing and screening waste concrete members, and the particle size is 3-10 mm continuous grading.
Further defined, the polyurethane cement complex is a mixture of polyurethane emulsion, aramid fiber, lime emulsion and cement; the pH of the polyurethane cement complex is 8-10.
Further defined, the cement is one or a mixture of a plurality of silicate cement, ordinary silicate cement, slag silicate cement and composite silicate cement.
Further limited, the polyurethane in the polyurethane cement complex is anionic water-based polyurethane, and the polyurethane emulsion is slightly alkaline and can exist stably in alkaline environment.
Further limiting, the rock wool fiber is obtained by soaking the rock wool in sodium hydroxide solution with the mass concentration of 5% for 48 hours, taking out, cleaning and cutting, wherein the length of the rock wool fiber is 5-10mm.
The air entraining agent is one of lignin salt air entraining agent and rosin air entraining agent.
Further limited, the disinfectant is isoindolinone, can be sterilized for a long time with high efficiency, and has a strong antibacterial effect.
Further defined, the permeation resistant agent is an osmotically crystallized permeation resistant agent.
Further defined, the water reducing agent is one of a polycarboxylate water reducing agent and an anti-mud type high-efficiency water reducing agent.
Further limited, the anti-seepage and anti-corrosion geotechnical bag in S4 at least comprises two layers of anti-corrosion and anti-corrosion waterproof films and a layer of high Jiang Tugong cloth, the longitudinal and transverse tearing strength is not lower than 2000N, and the maximum bearable capacity is not lower than 7KN.
Further limited, the anti-seepage and anti-corrosion geotechnical bags are provided with anti-corrosion waterproof films on the inner side and the outer side, and at least one layer of high Jiang Tugong cloth is arranged between the two anti-corrosion films.
Further limited, the high-strength geotextile is polyester staple fiber needled non-woven geotextile, the breaking strength is not lower than 12kN/m, the bursting strength is not lower than 2kN, and the tearing strength is not lower than 0.30kN.
Further limited, the anti-corrosion waterproof film is an HDPE composite geomembrane, the breaking strength is not lower than 21kN/m, and the puncture strength is not lower than 0.50kN.
The second object of the invention is to provide a sludge product obtained by the sludge sealing and storing treatment method, which is prepared from the following raw materials in parts by weight: 300-450 parts of sludge, 100-150 parts of fine aggregate, 160-200 parts of waste concrete coarse aggregate, 30-50 parts of polyurethane emulsion, 10-30 parts of lime cream, 100-150 parts of cement, 6-10 parts of rock wool fiber, 12-15 parts of impervious agent, 8-15 parts of disinfectant, 6-9 parts of water reducer and 5-8 parts of air entraining agent.
Further defined, the sludge product has a ratio of length, width and height dimensions of (300-500) mm (200-300) mm (100-300) mm and contains two preformed holes having diameters of 50-100 mm.
Further defined, the standard compressive strength of the sludge product is not lower than 6MPa and 8MPa at 7d and 28 d.
The invention further provides an application of the sludge product, and particularly the sludge product is filled into an anti-corrosion geotechnical bag, vacuumized and sealed by hot pressing to obtain regenerated sludge concrete, and then deeply buried in underground part maintenance structures such as pipe galleries, wells, landfill sites and sewage treatment plants for long-term sealing, and meanwhile collapse of the underground part maintenance structures such as the pipe galleries, the wells, the landfill sites and the sewage treatment plants is prevented.
Further limited, the anti-seepage and anti-corrosion geotechnical bags are provided with anti-corrosion waterproof films on the inner side and the outer side, and at least one layer of high Jiang Tugong cloth is arranged between the two anti-corrosion films.
Further limited, the high-strength geotextile is polyester staple fiber needled non-woven geotextile, the breaking strength is not lower than 12kN/m, the bursting strength is not lower than 2kN, and the tearing strength is not lower than 0.30kN.
Further limited, the anti-corrosion waterproof film is an HDPE composite geomembrane, the breaking strength is not lower than 21kN/m, and the puncture strength is not lower than 0.50kN.
The invention adopts natural cold condition to convert the bound water in the raw sludge into gap water which is easy to remove, then adds the high-temperature fine aggregate heated by the solar heating device into the sludge, then screens out the fine aggregate which does not enter the sludge through a vibrating screen and heats the fine aggregate again, and circulates until the mass ratio of the fine aggregate reaches the design requirement, thereby accelerating the thawing of the frozen sludge, and simultaneously, the high-temperature fine aggregate can further reduce the water content of the sludge. Transferring the sludge fine aggregate mixture and the waste concrete coarse aggregate into a micro negative pressure device for stirring uniformly, adding a disinfectant, stirring at a low speed for 4-7min, standing for 10-20min, adding an air entraining agent, an anti-permeability agent and a water reducing agent while stirring, stirring at a high speed for 3-5min, adding a polyurethane cement complex, stirring at a low speed for 3-5min, adding rock wool fibers, and continuing stirring at a low speed for 2-3min, so that the rock wool fibers and various additives are uniformly distributed between the sludge fine aggregate and the waste concrete coarse aggregate. And (3) uniformly stirring, filling into a mould, cold-pressing and forming to obtain a light sludge product with uniform closed bubbles inside, filling into an impermeable and anti-corrosion geotechnical bag, vacuumizing, hot-pressing and sealing, and finally deeply burying into a waste deep well and a deep pit for long-term sealing and storing, and simultaneously preventing collapse of the waste deep well and the deep pit. Compared with the prior art, the application has at least the following advantages:
(1) According to the invention, natural cold conditions are adopted to freeze the sludge, and the solar heating device is used for heating the sludge to a high Wen Zhongsha, so that not only is the melting speed of the sludge accelerated, but also the sludge is further dehydrated, the water content of the sludge is reduced to 20% -30%, and compared with the traditional sludge dehydration process, the operation capital cost and the time cost are reduced.
(2) Every time the invention produces 1m 3 The product is equivalent to sealing 350-500kg CO 2 The method has the advantages of effectively realizing carbon sequestration of sludge, recycling waste concrete, relieving treatment pressure of the waste concrete, reducing environmental pollution, effectively reducing consumption of natural aggregate, along with low cost and convenient material drawing, meeting the sustainable development requirement of human on living ecological environment, and meeting the requirements of recycling and harmless recycling of sludge waste.
(3) According to the invention, the polyurethane cement complex and the rock wool fibers are doped into the concrete product, so that the compressive strength of the regenerated sludge concrete is increased, the cracking of the regenerated sludge concrete is reduced, and the serious damage of the external anti-corrosion waterproof geotechnical bag caused by the cracking of the internal material is prevented. The adopted anti-corrosion waterproof geotechnical bag at least comprises two layers of anti-corrosion waterproof films and a layer of high Jiang Tugong cloth, has enough tensile force while resisting corrosion and water, and ensures that the structure of an internal object is stable and is not corroded for a long time.
(4) The final sludge product can be deeply buried in waste pits and deep wells, can effectively realize carbon sequestration of sludge and prevent collapse, can also be used for maintaining structures of underground parts such as pipe galleries, wells, landfill sites, sewage treatment plants and the like, reduces consumption of natural materials, and accords with the strategy of green sustainable development.
Drawings
Fig. 1 is a schematic process flow diagram of the sludge sealing treatment method provided by the invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The experimental methods used in the following examples are conventional methods unless otherwise specified. The materials, reagents, methods and apparatus used, without any particular description, are those conventional in the art and are commercially available to those skilled in the art.
The formulation composition of the sludge test block in all examples of the present invention is shown in Table 1, and the main properties of the sludge test block are shown in Table 2.
Specifically, raw sludge is from municipal sewage treatment plants, and the water content is 80%; the waste concrete is a waste concrete member dismantled on a construction site, the waste concrete blocks crushed by the crusher are poured into the crusher, and then the crushed waste concrete is sieved to ensure that the particle size range of the waste concrete is 3-10 mm; the polyurethane emulsion is Ji Tianpai 1926 aqueous polyurethane; the cement is P.O42.5 cement; the rock wool fiber is obtained by soaking rock wool in sodium hydroxide solution with the mass concentration of 5% for 48 hours, taking out, cleaning and cutting; the impervious agent is an osmotic crystallization impervious agent, in particular to an osmotic crystallization impervious agent of Zhengda brand 00056; the disinfectant is isoindolinone; the water reducer is a polycarboxylate water reducer, in particular a constant solid HLX polycarboxylate water reducer; the air entraining agent is sodium lignin sulfonate.
Example 1:
the raw materials of the sludge test block of this example were prepared as shown in the data corresponding to example 1 in table 1, specifically 30kg of raw sludge, 10kg of medium sand, 20kg of waste concrete coarse aggregate, 3kg of polyurethane emulsion, 1kg of lime milk, 10kg of cement, 0.6kg of rock wool fiber, 0.12kg of impervious agent, 0.8kg of disinfectant, 0.6kg of water reducing agent and 0.5kg of air entraining agent.
The process for preparing the sludge test block in this embodiment is shown in fig. 1, and specifically comprises the following steps:
step 1: freezing the raw sludge outdoors under the cold condition of below-5 ℃; and heating the fine aggregate to 70-80 ℃ by using a solar heating device.
Step 2: the high-temperature fine aggregate is rapidly added into the frozen sludge, the fine aggregate which does not enter the sludge is sieved out through a vibrating sieve and is heated for the second time, the circulation is carried out until the mass ratio of the fine aggregate meets the design requirement, and the sludge fine aggregate mixture and the waste concrete coarse aggregate are transferred into a micro negative pressure stirring device for uniform stirring.
Step 3: adding disinfectant into the micro negative pressure device, stirring at low speed for 4-7min, standing for 10-20min, adding waste concrete coarse aggregate, air entraining agent, impervious agent and water reducing agent while stirring, stirring at high speed for 3-5min, slowly adding polyurethane cement complex, stirring at low speed for 3-5min, and finally adding rock wool fiber, continuing stirring at low speed for 2-3min, so that the rock wool fiber and various additives are uniformly distributed between the sludge fine aggregate and the waste concrete coarse aggregate.
Step 4: and (3) filling the mixture into a mould for cold compression molding to obtain a light sludge product with uniform closed bubbles inside, filling the sludge product into an anti-seepage and anti-corrosion geotechnical bag after curing for 28 days, vacuumizing, hot-pressing and sealing, and finally deeply burying the sludge product into a waste deep well and a deep pit for long-term sealing and preserving, so that carbon in the sludge is effectively preserved and collapse of the waste deep well and the deep pit is prevented.
The application method of the sludge test block prepared in the embodiment specifically comprises the steps of filling the polyurethane sludge test block subjected to demoulding into a seepage anti-corrosion geotechnical bag with a specific size, vacuumizing, hot-pressing and sealing, and then deeply burying the anti-corrosion waterproof geotechnical bag subjected to vacuum sealing in a waste deep well and a deep pit for long-term sealing and storing.
Example 2:
the raw materials of the sludge test block of this example were prepared as shown in the data corresponding to example 2 in table 1, and specifically 34kg of raw sludge, 10kg of medium sand, 20kg of waste concrete coarse aggregate, 3kg of polyurethane emulsion, 1kg of lime milk, 10kg of cement, 0.6kg of rock wool fiber, 0.12kg of impervious agent, 0.8kg of disinfectant, 0.6kg of water reducing agent and 0.5kg of air entraining agent.
The procedure and parameter settings for the preparation of the sludge test block in this example were the same as in example 1.
The method for applying the sludge test block prepared in this example was the same as in example 1.
Example 3:
the raw materials of the sludge test block of this example were prepared as shown in the data corresponding to example 3 in table 1, and specifically 30kg of raw sludge, 10kg of medium sand, 20kg of waste concrete coarse aggregate, 4kg of polyurethane emulsion, 1kg of lime milk, 10kg of cement, 0.6kg of rock wool fiber, 0.12kg of impervious agent, 0.8kg of disinfectant, 0.6kg of water reducing agent and 0.5kg of air entraining agent. The procedure and parameter settings for the preparation of the sludge test block in this example were the same as in example 1.
The method for applying the sludge test block prepared in this example was the same as in example 1.
Example 4:
the raw materials of the sludge test block of this example were prepared as shown in the data corresponding to example 4 in table 1, specifically 30kg of raw sludge, 10kg of medium sand, 20kg of waste concrete coarse aggregate, 5kg of polyurethane emulsion, 1kg of lime milk, 10kg of cement, 0.6kg of rock wool fiber, 0.12kg of impervious agent, 0.8kg of disinfectant, 0.6kg of water reducing agent and 0.5kg of air entraining agent. The procedure and parameter settings for the preparation of the sludge test block in this example were the same as in example 1.
The method for applying the sludge test block prepared in this example was the same as in example 1.
Example 5:
the raw materials of the sludge test block of this example were prepared as shown in the data corresponding to example 5 in table 1, specifically 30kg of raw sludge, 10kg of medium sand, 20kg of waste concrete coarse aggregate, 3kg of polyurethane emulsion, 1kg of lime milk, 10kg of cement, 0.3kg of rock wool fiber, 0.12kg of impervious agent, 0.8kg of disinfectant, 0.6kg of water reducer and 0.5kg of air entraining agent. The procedure and parameter settings for the preparation of the sludge test block in this example were the same as in example 1.
The method for applying the sludge test block prepared in this example was the same as in example 1.
Effect example:
the proportions of the raw materials in examples 1 to 5 are shown in Table 1 below.
TABLE 1
The test detection modes of the sludge test blocks obtained in examples 1 to 5 are as follows: compressive strength testing was performed according to GB/T50080-2002 Standard test method for mechanical Properties of common concrete.
The test results of the sludge test blocks obtained in examples 1 to 5 are shown in the following table 2;
as can be seen from the experimental results shown in Table 2, in example 2, compared with example 1, the weight of the other raw materials is unchanged, and the sludge in example 2 is increased by 4kg compared with example 1, so that the increase of the raw material ratio of the sludge can reduce the compressive strength of the test block, and the ratio of the sludge can be increased or decreased as appropriate according to the requirements of the field environment in actual construction.
Compared with example 1, the weight of other raw materials is unchanged, the weight of the polyurethane emulsion in example 3 is increased by 1kg compared with example 1, and the weight of the polyurethane emulsion in example 4 is increased by 1kg compared with example 3, so that the compression strength of the test block can be effectively improved by increasing the weight ratio of the polyurethane emulsion, and the ratio of the polyurethane emulsion can be increased as appropriate when the actual construction site has higher compression strength.
Compared with example 1, the weight of other raw materials is unchanged, the content of rock wool fibers in example 5 is relatively reduced by 0.3kg, so that the rock wool fibers can increase the compressive strength of the structure, the ratio of polyurethane emulsion can be kept unchanged under the condition of considering the fund cost, and the content of the rock wool fibers is properly increased.
The above description is merely a preferred embodiment of the present invention, and since the person skilled in the art can make appropriate changes and modifications to the above-described embodiment, the present invention is not limited to the above-described embodiment, and some modifications and changes of the present invention should fall within the scope of the claims of the present invention.
Claims (7)
1. The method for carbon sequestration of sludge is characterized by comprising the following steps:
s1, putting the sludge outdoors to freeze under the cold condition of below-5 ℃; heating the fine aggregate to 70-80 ℃ by using a solar heating device;
s2, rapidly adding high-temperature fine aggregate into the frozen sludge, screening out the fine aggregate which is not mixed into the sludge through a vibrating screen, heating for the second time, circulating until the mass ratio of the fine aggregate reaches the design requirement, and then transferring the sludge fine aggregate mixture and the waste concrete coarse aggregate into a micro negative pressure stirring device for uniform stirring;
s3, adding a disinfectant into the micro negative pressure device, stirring for 4-7min at a low speed, standing for 10-20min, adding an air entraining agent, an anti-permeability agent and a water reducing agent which are dissolved in water in advance while stirring, stirring for 3-5min at a high speed, slowly adding a polyurethane cement complex, stirring for 3-5min at a low speed, and finally adding rock wool fibers, continuing stirring for 2-3min at a low speed, so that the rock wool fibers and various additives are uniformly distributed between the sludge fine aggregate and the waste concrete coarse aggregate;
s4, filling the sludge into a mold for cold compression molding to obtain a light sludge product with uniform closed bubbles inside, filling the sludge product into an anti-seepage and anti-corrosion geotechnical bag after curing for 28 days, vacuumizing, hot-pressing and sealing, and finally deeply burying the sludge product into a waste deep well and a deep pit for long-term sealing and storing, so that carbon in the sludge is effectively sealed and meanwhile collapse of the waste deep well and the deep pit is prevented;
the polyurethane cement complex is obtained by uniformly mixing polyurethane emulsion, aramid fiber and lime emulsion, adding cement and uniformly stirring, wherein the pH value is 8-10;
the sludge product obtained by the sludge carbon sequestration process is prepared from the following raw materials in parts by weight: 300-450 parts of sludge, 100-150 parts of fine aggregate, 160-200 parts of waste concrete coarse aggregate, 30-50 parts of polyurethane emulsion, 10-30 parts of lime cream, 100-150 parts of cement, 6-10 parts of rock wool fiber, 12-15 parts of impervious agent, 8-15 parts of disinfectant, 6-9 parts of water reducer and 5-8 parts of air entraining agent;
the cold press forming process in the step S4 is carried out twice, the pressure applied by the first cold press is 130-160MPa, and the cold press lasts for 2-4S; the pressure applied by the second cold pressing is 180-200MPa, and the cold pressing lasts for 3-6s;
the sludge is the sludge dehydrated by municipal sewage treatment plants and subjected to freeze thawing, gas in the sludge is pumped out by a micro negative pressure stirring device, uniform closed bubbles are formed in the stirring process, the pressure of the micro negative pressure stirring device is 30-100Pa, the stirring volume is 0.5-2.0m, and the power of the stirrer is 10-20 kilowatts.
2. The method for preparing sludge carbon as claimed in claim 1, wherein the rock wool fiber is obtained by soaking the rock wool in 5% NaOH solution for 48 hours, taking out, cleaning and cutting, and has a length of 5-10cm.
3. The method for preparing sludge carbon according to claim 1, wherein the waste concrete coarse aggregate is obtained by crushing and screening dismantled waste concrete members, and has a particle size of 3-10 mm.
4. The method for carbon sequestration of sludge of claim 1, wherein the cement is one or a mixture of several of portland cement, ordinary portland cement, slag portland cement, composite portland cement.
5. The method for sealing up sludge carbon as claimed in claim 1, wherein the air entraining agent is lignin salt air entraining agent or rosin air entraining agent; the impervious agent is a permeable crystallization type impervious agent, and the water reducing agent is a polycarboxylate water reducing agent or a mud-resistant water reducing agent.
6. The method for sealing up sludge carbon according to claim 1, wherein the anti-seepage and anti-corrosion geotechnical bag in the step S4 at least comprises two layers of anti-corrosion and anti-corrosion waterproof films and a layer of high Jiang Tugong cloth, the longitudinal and transverse tearing strength is not lower than 2000N, and the maximum bearable capacity is not lower than 7KN.
7. The method for carbon sequestration of sludge according to claim 1, characterized in that the dimension of the sludge product is (300-500) mm× (200-300) mm× (100-300) mm, and the standard compressive strength of the sludge product is not lower than 6MPa and 8MPa at 7d and 28 d.
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| CN113429178A (en) * | 2021-07-20 | 2021-09-24 | 崇德建材集团有限公司 | Freeze-thaw resistant recycled concrete and preparation method thereof |
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| JP2005289662A (en) * | 2004-03-31 | 2005-10-20 | Shigeo Koshikawa | Method of recycling sludge |
| CN101007696A (en) * | 2007-01-22 | 2007-08-01 | 湖南军信环保建设开发有限公司 | Sludge solidification and filling processing method |
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