CN111559774B - Wall slurry and prepared barrier reaction wall - Google Patents
Wall slurry and prepared barrier reaction wall Download PDFInfo
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- CN111559774B CN111559774B CN202010435452.8A CN202010435452A CN111559774B CN 111559774 B CN111559774 B CN 111559774B CN 202010435452 A CN202010435452 A CN 202010435452A CN 111559774 B CN111559774 B CN 111559774B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides wall slurry which comprises, by weight, 85-94 parts of a wall main body material and 6-15 parts of a reaction material. According to the wall body slurry and the barrier reaction wall prepared by using the wall body slurry, the wall body main material has the capability of preventing the penetration of pollutants, and can effectively block the contact between the pollutants and the outside; the reaction material can adsorb and react the pollutants, so that the harmful substances are retained in the wall body, and the purpose of controlling the diffusion of the pollutants is achieved.
Description
Technical Field
The invention belongs to the technical field of pollutant prevention and control, and particularly relates to wall slurry and a prepared barrier reaction wall.
Background
With the rapid development of the industry in China, the environmental pollution is becoming more and more serious. Pollution sites such as chemical engineering, mine pollution plots and irregular refuse landfills lack effective anti-seepage measures, so that pollution to surrounding soil and underground water bodies is caused to different degrees, and the ecological environment is seriously damaged. Pollutants are mainly diffused to the periphery through water in a field to cause ecological environment pollution, and the current effective management and control measures mainly comprise low-permeability vertical separation walls and permeable reaction walls.
The low-permeability vertical barrier wall is a main mode for controlling the polluted site, and the migration of pollutants is controlled by blocking the connection between water in the polluted site and the surrounding environment; the low-permeability vertical separation wall has wide application in the fields of water conservancy, environmental protection, tunnel traffic and the like, and the permeability coefficient is usually 10 -5 ～10 -7 cm/s, the wall body can effectively prevent water from passing through but cannot be completely isolated, a part of pollutants can seep out along with the water body, the pollutants can seep out along with the water body, and the isolation effect is not thorough.
The permeable reactive barrier makes the polluted water body pass through the permeable reactive barrier by the action of hydraulic gradient, and the pollutants in the water body are removed by utilizing the active reaction medium in the wall body, so as to achieve the effect of purifying the water body. However, the reaction wall has limited medium capacity, and can not remove pollutants without limit, so that the reaction medium needs to be replaced regularly to ensure the treatment efficiency, thereby increasing the subsequent maintenance cost; in addition, after the reaction medium reacts with pollutants in the groundwater for a period of time, the problems of inactivation of the reaction medium, blockage of the filler and the like can occur, the inactivation and blockage of the reaction medium can cause the failure of PRB, and the risk that the pollutants are easy to diffuse to the periphery exists.
Although both of the above techniques play a desirable role in engineering applications, there is a risk of contaminant diffusion during use due to their respective disadvantages.
Disclosure of Invention
The first purpose of the invention is to provide wall slurry, the slump of the wall slurry is more than or equal to 180mm, and the specific gravity of the wall slurry is more than or equal to 1.4g/cm 3 The wall body material has the capability of preventing permeation and can effectively block the connection between pollutants and the outside; the reaction material can adsorb and react the pollutants, so that the harmful substances are trapped inside the wall body, and the purpose of controlling the diffusion of the pollutants is achieved.
The second purpose of the invention is to provide a preparation method of the wall slurry.
The third purpose of the invention is to provide a barrier reaction wall, the wall permeability coefficient of which is not more than 10 -7 cm/s, the removal rate of the indicative pollutants is more than 98 percent; not only can effectively block the contact between the pollutants and the outside, even if a small amount of pollutants enter the wall body, the reaction medium in the wall body can also effectively adsorb and react the pollutants, so that the harmful substances are trapped in the wall body, thereby achieving the purpose of better controlling the diffusion of pollutants.
In order to realize the first purpose of the invention, the adopted technical scheme is as follows: the wall slurry comprises, by weight, 85-94 parts of a wall body material and 6-15 parts of a reaction material.
Furthermore, the wall body slurry comprises 90 parts of wall body main material and 10 parts of reaction material in parts by weight.
The wall body slurry disclosed by the invention consists of a wall body material and a reaction material, wherein the wall body material ensures that the wall body can show the most main low permeability, and plays a role in effectively isolating and blocking pollutants; the reaction material has the functions of adsorbing, precipitating and oxidizing and reducing pollutants, and a small amount of pollutants entering the wall body are left in the wall body through reaction or the toxicity of the pollutants is eliminated, so that the pollutants are prevented from being diffused outwards. The barrier reaction wall prepared by the wall slurry can give consideration to both high-efficiency barrier and long-acting reaction, thereby achieving the purpose of better controlling the diffusion of pollutants.
Further, the reaction material comprises the following components in parts by weight: 2-8 parts of activated carbon, 2-10 parts of zeolite, 0-5 parts of reduced iron powder and 2-5 parts of attapulgite.
Further, the wall body material comprises the following components in percentage by weight: 5-30 parts of bentonite, 0-20 parts of cement, 20-65 parts of clay, 10-25 parts of sand and 0-15 parts of additive.
Further, when the wall body material contains cement, the wall body slurry also comprises a water reducing agent, wherein the amount of the water reducing agent is 0.5-2%, preferably 1% of the weight of the cement; the additive is one or more of mineral powder and fly ash.
Furthermore, the bentonite is sodium bentonite, the cement is general portland cement with the strength grade not less than 42.5, and the additive is one or more of mineral powder and fly ash.
In the invention, as a preferred scheme, the bentonite is sodium bentonite, and the sodium bentonite has better adsorption reaction capacity, can assist reaction materials and effectively improve the adsorption reaction capacity of the whole wall body to pollutants.
Furthermore, the activated carbon has an iodine value of more than or equal to 800mg/g, a packing density of 440-550g/L and a particle size of 0.1-2mm; the zeolite is clinoptilolite, wherein the content of silicon and aluminum is more than or equal to 95 percent, and the particle size is 0.5-3mm; the reduced iron powder is zero-valent iron, wherein the content of iron is more than or equal to 95 percent, and the particle size is 0.1-1mm; the attapulgite clay contains more than or equal to 60% of attapulgite and has a particle size of 0.1-2mm.
In the invention, bentonite, cement, sand, clay and additives are used as main materials of the wall body for building the wall body, so that the wall body is formed; activated carbon, zeolite, reduced iron powder and attapulgite which are used as reaction materials are used as reaction media and are uniformly mixed with the main body material of the wall body, so that the reaction media are uniformly distributed in the wall body, and when pollutants infiltrate into the wall body, the reaction media and the pollutants are adsorbed or reacted, so that the pollutants are removed.
Furthermore, the slump of the wall slurry is more than or equal to 180mm, and the specific gravity is more than or equal to 1.4g/cm 3 。
In order to achieve the second purpose of the invention, the adopted technical scheme is as follows: a process for preparing wall slurry includes such steps as mixing the main material of wall with the reactive material, adding water and stirring.
In the invention, the wall body material and the reaction material are simultaneously added and stirred, so that the wall body material and the reaction material are uniformly mixed, and various reaction media in the reaction material are uniformly distributed, thereby ensuring good effect in decontamination; the slump of the wall slurry is more than or equal to 180mm, and the specific gravity of the wall slurry is more than or equal to 1.4g/cm 3 (ii) a The wall body slurry can be guaranteed to be firm and good in effect when being poured to form a wall body, and meanwhile, the wall body slurry is convenient to form.
Further, when the main body material of the wall contains cement, after water is added and stirred uniformly, a water reducing agent is also added, wherein the adding amount of the water reducing agent is 0.5-2% of the weight of the cement, and the preferable amount is 1%; the water reducing agent is one of a lignosulfonate water reducing agent, a naphthalene sulfonate water reducing agent or a melamine water reducing agent.
In the invention, when the main wall material contains cement, the main wall material and the reaction material are added, then water is added and stirred, and then the water reducing agent is added and stirring is continued, so that the dispersion effect of the cement can be improved, the water consumption is reduced, and the workability of the slurry is improved.
In order to realize the third purpose of the invention, the adopted technical scheme is as follows: the barrier reaction wall is prepared by pouring the wall body slurry, wherein the wall body permeability coefficient of the barrier reaction wall is not more than 10 -7 cm/s, indicating contaminant removal greater than 98%.
In the invention, the barrier reaction wall is formed by pouring wall body slurry, and the permeability coefficient of the wall body is not more than 10 - 7 cm/s, can effectively block pollutants from proceedingAnd the removal rate of the permeable indicative pollutants is more than 98%, so that harmful substances in the pollutants can be removed, and the purpose of preventing the pollutants from diffusing is achieved.
The invention has the advantages and positive effects that:
the reaction medium is arranged in the wall body of the low-permeability vertical separation reaction wall, and the permeability coefficient of the wall body is not more than 10 -7 cm/s, which can effectively block pollutants; even if a small amount of pollutants enter the wall body, the reaction medium in the wall body can effectively adsorb and react the pollutants, so that the harmful substances are retained in the wall body, and the purpose of controlling the diffusion of the pollutants is achieved.
The low-permeability vertical barrier reaction wall optimizes the existing pollution barrier technology, and the low-permeability vertical barrier reaction wall prepared from the wall body main body material and the reaction material has the purposes of blocking pollutants and reacting with the pollutants to remove the pollutants, so that the high-efficiency barrier and the long-acting reaction are unified, and the diffusion of the pollutants can be better controlled.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Example 1:
consists of the following components:
90 parts of wall body material: wherein, 20 parts of sodium bentonite, 15 parts of ordinary Portland cement with the strength of 42.5, 20 parts of clay, 25 parts of sand and 5 parts of mineral powder;
10 parts of reaction materials: wherein, 2 parts of activated carbon, 5 parts of clinoptilolite and 3 parts of attapulgite; the iodine value of the activated carbon is 890mg/g, the packing density is 452g/L, and the particle size is 0.2mm; the content of silicon and aluminum in clinoptilolite is 96.8%, and the particle size is 1mm; the attapulgite in the attapulgite accounts for 70% and has a particle size of 1mm.
The water reducing agent is lignosulfonate water reducing agent, and the addition amount of the lignosulfonate water reducing agent is 1% of the weight of the cement.
The preparation method comprises the following steps:
and simultaneously feeding the wall body material and the reaction material, adding water, stirring uniformly, adding the water reducing agent, continuously stirring, and uniformly mixing to obtain the wall body slurry.
The slump and specific gravity of the prepared wall slurry are detected, and the detection results are shown in table 1;
reserving a wall body slurry sample, pouring the wall body slurry, curing for 28 days to prepare a barrier reaction wall, carrying out a permeability coefficient experiment on the wall body of the barrier reaction wall, and detecting the permeability coefficient of the wall body; the results are shown in Table 1. Detecting the wall body filtration efficiency by adopting a landfill solution, and detecting the removal rate of pollutants by taking hexavalent chromium, cadmium and lead in ammonia nitrogen and heavy metals as detection indexes; the results are shown in Table 2.
Example 2:
consists of the following components:
90 parts of wall body material: wherein, 15 parts of sodium bentonite, 60 parts of clay and 15 parts of sand;
10 parts of reaction materials: wherein, 2 parts of activated carbon, 4 parts of zeolite, 2 parts of attapulgite and 2 parts of reduced iron powder; the iodine value of the activated carbon is 890mg/g, the packing density is 452g/L, and the particle size is 0.2mm; the content of silicon and aluminum in clinoptilolite is 96.8%, and the particle size is 1mm; the iron content of the reduced iron powder is 96 percent, and the particle size is 0.5mm; the attapulgite in the attapulgite accounts for 70% and has a particle size of 1mm.
The preparation method comprises the following steps:
and (3) simultaneously feeding the main material and the reaction material of the wall body, adding water and uniformly stirring to obtain the wall body slurry.
The slump and specific gravity of the prepared wall slurry are detected, and the detection results are shown in table 1;
reserving a wall body slurry sample, pouring the wall body slurry, curing for 28 days to prepare the barrier reaction wall, performing a permeability coefficient experiment on the wall body of the barrier reaction wall, and detecting the permeability coefficient of the wall body; the results are shown in Table 1. Detecting the wall body filtration efficiency by adopting a landfill solution, and detecting the removal rate of pollutants by taking hexavalent chromium, cadmium and lead in ammonia nitrogen and heavy metals as detection indexes; the results are shown in Table 2.
Example 3:
comprises the following components:
90 parts of wall body material: wherein, 5 parts of sodium bentonite, 20 parts of ordinary portland cement with the strength grade of 42.5, 45 parts of clay, 10 parts of sand and 5 parts of fly ash;
10 parts of reaction materials: wherein, 2 parts of activated carbon, 6 parts of zeolite and 2 parts of attapulgite; the iodine value of the active carbon is 852mg/g, the packing density is 490g/L, and the particle size is 2mm; the clinoptilolite has a silicon-aluminum content of 95 percent and a particle size of 0.5mm; the attapulgite accounts for 65% of the attapulgite in the attapulgite, and the particle size is 0.1mm.
The water reducing agent is naphthalene sulfonate water reducing agent, and the addition amount of the water reducing agent is 0.5 percent of the weight of the cement.
The preparation method comprises the following steps:
and simultaneously feeding the wall body material and the reaction material, adding water, stirring uniformly, adding the water reducing agent, continuously stirring, and uniformly mixing to obtain the wall body slurry.
The slump and specific gravity of the prepared wall slurry are detected, and the detection results are shown in table 1;
reserving a wall body slurry sample, pouring the wall body slurry, curing for 28 days to prepare the barrier reaction wall, performing a permeability coefficient experiment on the wall body of the barrier reaction wall, and detecting the permeability coefficient of the wall body; the results are shown in Table 1. Detecting the wall body filtration efficiency by adopting a landfill solution, and detecting the removal rate of pollutants by taking hexavalent chromium, cadmium and lead in ammonia nitrogen and heavy metals as detection indexes; the results are shown in Table 2.
Example 4:
consists of the following components:
90 parts of wall body material: wherein, 30 parts of sodium bentonite, 40 parts of clay and 20 parts of sand;
10 parts of reaction materials: wherein, 2 parts of activated carbon, 4 parts of zeolite, 2 parts of attapulgite and 2 parts of reduced iron powder; the iodine value of the activated carbon is 910mg/g, the packing density is 500g/L, and the particle size is 2mm; the content of silicon and aluminum of clinoptilolite is 98%, and the particle size is 3mm; the iron content of the reduced iron powder is 98 percent, and the particle size is 1mm; the attapulgite in the attapulgite accounts for 68% and has a particle size of 2mm.
The preparation method comprises the following steps:
and simultaneously feeding the wall body material and the reaction material, adding water, stirring, and uniformly stirring to obtain the wall body slurry.
The slump and specific gravity of the prepared wall slurry are detected, and the detection results are shown in table 1;
reserving a wall body slurry sample, pouring the wall body slurry, curing for 28 days to prepare the barrier reaction wall, performing a permeability coefficient experiment on the wall body of the barrier reaction wall, and detecting the permeability coefficient of the wall body; the results are shown in Table 1. Detecting the wall filtering efficiency by adopting a landfill solution, and detecting the removal rate of pollutants by taking hexavalent chromium, cadmium and lead in ammonia nitrogen and heavy metals as detection indexes; the results are shown in Table 2.
Example 5:
consists of the following components:
88 parts of wall body material: wherein, 15 parts of sodium bentonite, 8 parts of ordinary portland cement with the strength grade of 42.5, 25 parts of clay, 25 parts of sand, 5 parts of fly ash and 10 parts of mineral powder;
12 parts of reaction materials: wherein, 4 parts of activated carbon, 5 parts of zeolite, 2 parts of attapulgite and 1 part of reduced iron powder; the iodine value of the activated carbon is 894mg/g, the packing density is 470g/L, and the particle size is 0.5mm; the content of silicon and aluminum in clinoptilolite is 95.4%, and the particle size is 0.9mm; the iron content of the reduced iron powder is 95.6 percent, and the particle size is 0.9mm; the attapulgite accounts for 74% of the attapulgite in the attapulgite, and the particle size is 0.8mm.
The water reducing agent is melamine water reducing agent, and the adding amount of the water reducing agent is 2% of the weight of the cement.
The preparation method comprises the following steps:
and simultaneously feeding the wall body material and the reaction material, adding water, stirring uniformly, adding the water reducing agent, continuously stirring, and uniformly mixing to obtain the wall body slurry.
The slump and specific gravity of the prepared wall slurry are detected, and the detection results are shown in table 1;
reserving a wall body slurry sample, pouring the wall body slurry, curing for 28 days to prepare the barrier reaction wall, performing a permeability coefficient experiment on the wall body of the barrier reaction wall, and detecting the permeability coefficient of the wall body; the results are shown in Table 1. Detecting the wall body filtration efficiency by adopting a landfill solution, and detecting the removal rate of pollutants by taking hexavalent chromium, cadmium and lead in ammonia nitrogen and heavy metals as detection indexes; the results are shown in Table 2.
Example 6:
comprises the following components:
85 parts of wall body materials: wherein, 5 parts of sodium bentonite, 10 parts of slag portland cement with the strength grade of 42.5, 55 parts of clay, 10 parts of sand and 5 parts of fly ash;
15 parts of reaction materials: wherein, 4 parts of activated carbon, 5 parts of zeolite, 3 parts of attapulgite and 3 parts of reduced iron powder; the iodine value of the activated carbon is 940mg/g, the filling density is 532g/L, and the particle size is 0.9mm; the content of silicon and aluminum in clinoptilolite is 96.9%, and the particle size is 2mm; the iron content of the reduced iron powder is 97%, and the particle size is 0.8mm; the attapulgite accounts for 80% of the attapulgite, and the particle size is 0.4mm.
The water reducing agent is lignosulfonate water reducing agent, and the addition amount of the lignosulfonate water reducing agent is 1% of the weight of the cement.
The preparation method comprises the following steps:
and simultaneously feeding the wall body material and the reaction material, adding water, stirring uniformly, adding the water reducing agent, continuously stirring, and uniformly mixing to obtain the wall body slurry.
The slump and specific gravity of the prepared wall slurry are detected, and the detection results are shown in table 1;
reserving a wall body slurry sample, pouring the wall body slurry, curing for 28 days to prepare the barrier reaction wall, performing a permeability coefficient experiment on the wall body of the barrier reaction wall, and detecting the permeability coefficient of the wall body; the results are shown in Table 1. Detecting the wall body filtration efficiency by adopting a landfill solution, and detecting the removal rate of pollutants by taking hexavalent chromium, cadmium and lead in ammonia nitrogen and heavy metals as detection indexes; the results are shown in Table 2.
Example 7:
comprises the following components:
94 parts of wall body material: wherein, 37 parts of sodium bentonite, 47 parts of clay and 10 parts of sand;
6 parts of reaction materials: wherein, 2 parts of activated carbon, 2 parts of zeolite and 2 parts of attapulgite; the iodine value of the activated carbon is 890mg/g, the packing density is 452g/L, and the particle size is 0.1mm; the content of silicon and aluminum in clinoptilolite is 96.8%, and the particle size is 2mm; the attapulgite accounts for 85% of the attapulgite in the attapulgite, and the particle size is 0.9mm.
The preparation method comprises the following steps:
and simultaneously feeding the wall body material and the reaction material, adding water, stirring, and uniformly stirring to obtain the wall body slurry.
The slump and specific gravity of the prepared wall slurry are detected, and the detection results are shown in table 1;
reserving a wall body slurry sample, pouring the wall body slurry, curing for 28 days to prepare the barrier reaction wall, performing a permeability coefficient experiment on the wall body of the barrier reaction wall, and detecting the permeability coefficient of the wall body; the results are shown in Table 1. Detecting the wall filtering efficiency by adopting a landfill solution, and detecting the removal rate of pollutants by taking hexavalent chromium, cadmium and lead in ammonia nitrogen and heavy metals as detection indexes; the results are shown in Table 2.
Comparative example 1:
consists of the following components:
100 parts of wall body material: wherein, 15 parts of sodium bentonite, 15 parts of ordinary portland cement with the strength grade of 42.5, 35 parts of clay, 25 parts of sand and 5 parts of mineral powder;
the water reducing agent is lignosulfonate water reducing agent, and the addition amount of the lignosulfonate water reducing agent is 1% of the weight of the cement.
The preparation method comprises the following steps:
and (3) feeding the wall body material, adding water, stirring, adding a water reducing agent, and uniformly mixing to obtain the wall body slurry.
The slump and specific gravity of the prepared wall slurry are detected, and the detection results are shown in table 1;
reserving a sample of wall slurry, pouring the wall slurry, maintaining for 28 days to prepare a wall, performing a permeability coefficient experiment on the wall, and detecting the permeability coefficient of the wall; the results are shown in Table 1. Detecting the wall body filtration efficiency by adopting a landfill solution, and detecting the removal rate of pollutants by taking ammonia nitrogen and heavy metal as detection indexes; the results are shown in Table 2.
Comparative example 2:
consists of the following components:
100 parts of wall body material: wherein, 15 parts of sodium bentonite, 65 parts of clay and 20 parts of sand.
The preparation method comprises the following steps:
and (3) feeding the wall body material, adding water, stirring, and uniformly stirring to obtain the wall body slurry.
The slump and specific gravity of the prepared wall slurry are detected, and the detection results are shown in table 1;
reserving a sample of wall slurry, pouring the wall slurry, maintaining for 28 days to prepare a wall, performing a permeability coefficient experiment on the wall, and detecting the permeability coefficient of the wall; the results are shown in Table 1. Detecting the wall body filtration efficiency by adopting a landfill solution, and detecting the removal rate of pollutants by taking hexavalent chromium, cadmium and lead in ammonia nitrogen and heavy metals as detection indexes; the results are shown in Table 2.
The specific detection method for each experiment is as follows:
in the above examples and comparative examples, the concrete method for detecting the slump of the wall slurry comprises the following steps: the slump of the wall slurry was measured according to the concrete mixture slump test method of SL352-2006 Water-soil concrete test Specification, and the measurement results are shown in Table 1.
In the above embodiment and comparative example, the specific gravity detection method of the wall slurry comprises the following steps: according to the detection standard of SL237-1999 geotechnical test regulation SL237-005-1999, the specific gravity of the wall slurry is detected by a pycnometer method, and the detection result is shown in table 1.
In the above embodiment and comparative example, the method for detecting the permeability coefficient of the wall body comprises the following steps: according to the detection standard of SL237-1999 geotechnical test code SL237-014-1999, the permeability coefficient of the wall is detected by adopting a variable water head permeability test, and the detection result is shown in Table 1.
In the above examples and comparative examples, the detection method of the removal rate of ammonia nitrogen is as follows: according to a detection method of 9.1 in GB/T5750.5-2006 inorganic nonmetal index of standard detection method for domestic drinking water, the ammonia nitrogen content in the refuse landfill solution and the ammonia nitrogen content in the clear liquid seeping out of the wall are respectively detectedAre respectively counted as X 1 And X 2 The removal rate is (X) 1 -X 2 )/X 1 The results are shown in Table 2.
In the above examples and comparative examples, the method for detecting the removal rate of hexavalent chromium is as follows: according to the detection method of 10.1 in GB/T5750.6-2006 Metal index Standard inspection method for domestic Drinking Water, the contents of hexavalent chromium in the refuse landfill solution and the clear liquid seeping out of the wall are respectively detected, and respectively calculated as a 1 And a 2 The removal rate is (a) 1 -a 2 )/a 1 The results are shown in Table 2.
In the above examples and comparative examples, the method for detecting the removal rate of lead was: according to the detection method of 11.1 in GB/T5750.6-2006 Metal index Standard test method for domestic Drinking Water, the lead content in the refuse landfill solution and the lead content in the clear liquid seeping out of the wall are respectively detected, and are respectively counted as b 1 And b 2 The removal rate is (b) 1 -b 2 )/b 1 The results are shown in Table 2.
In the above embodiment and comparative example, the method for detecting the removal rate of cadmium is as follows: according to a detection method of 9.1 in GB/T5750.6-2006 Metal index Standard test method for domestic Drinking Water, the cadmium content in the refuse landfill solution and the cadmium content in the clear liquid seeping out of the wall are respectively detected, and are respectively counted as c 1 And c 2 The removal rate is (c) 1 -c 2 )/c 1 The results are shown in Table 2.
Table 1 shows the results of the performance tests of the different examples
TABLE 2 removal of contaminants in various examples
By combining the tables 1 and 2 and comparing the examples 1 to 7, the low-permeability vertical barrier reaction wall has strong anti-permeability and can effectively remove the pollutants permeating into the wall; comparing comparative example 1 and comparative example 2 in table 2 with the examples, it can be seen that the addition of the reactive material to the wall body material can effectively adsorb and react to remove the contaminants penetrating into the wall body, and the removal rate can reach 98% or more, thereby effectively preventing the contaminants and harmful substances from diffusing.
The reaction medium is arranged in the wall body of the low-permeability vertical separation reaction wall, and the permeability coefficient of the wall body is not more than 10 -7 cm/s, which can effectively block pollutants; even if a small amount of pollutants enter the wall body, the reaction medium in the wall body can effectively adsorb and react the pollutants, so that the harmful substances are retained in the wall body, and the purpose of controlling the diffusion of the pollutants is achieved.
The low-permeability vertical barrier reaction wall optimizes the existing pollution barrier technology, and the low-permeability vertical barrier reaction wall prepared from the wall body main body material and the reaction material has the purposes of blocking pollutants and reacting with the pollutants to remove the pollutants, so that the high-efficiency barrier and the long-acting reaction are unified, and the diffusion of the pollutants can be better controlled.
Although the embodiments of the present invention have been described in detail, the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. A wall slurry is characterized in that: the wall body comprises 85-94 parts of wall body main material and 6-15 parts of reaction material;
the reaction material comprises the following components in parts by weight: 2-8 parts of activated carbon, 2-10 parts of zeolite, 0-5 parts of reduced iron powder and 2-5 parts of attapulgite;
the activated carbon has an iodine value of more than or equal to 800mg/g, a packing density of 440-550g/L and a particle size of 0.1-2mm; the zeolite is clinoptilolite, wherein the content of silicon and aluminum is more than or equal to 95 percent, and the particle size is 0.5-3mm; the reduced iron powder is zero-valent iron, wherein the content of iron is more than or equal to 95 percent, and the particle size is 0.1-1mm; the attapulgite clay contains more than or equal to 60% of attapulgite and has a particle size of 0.1-2mm;
the wall body material comprises the following components in parts by weight: 5-30 parts of bentonite, 0-20 parts of cement, 20-65 parts of clay, 10-25 parts of sand and 0-15 parts of additive;
the slump of the wall slurry is more than or equal to 180mm, and the specific gravity is more than or equal to 1.4g/cm 3 。
2. The wall slurry of claim 1, wherein: 90 parts of wall body material and 10 parts of reaction material.
3. The wall slurry of claim 1, wherein: when the main body material of the wall body contains cement, the wall body slurry also comprises a water reducing agent, and the amount of the water reducing agent is 0.5-2% of the weight of the cement; the additive is one or more of mineral powder and fly ash.
4. A wall slurry as claimed in claim 3, wherein: the amount of the water reducing agent is 1 percent of the weight of the cement.
5. The wall slurry of claim 3, wherein: the bentonite is sodium bentonite, the strength grade of the cement is not less than 42.5 general portland cement, and the water reducing agent is one of a lignosulfonate water reducing agent, a naphthalenesulfonate water reducing agent or a melamine water reducing agent.
6. A preparation method of wall slurry is characterized by comprising the following steps: and (3) simultaneously feeding the main wall body material and the reaction material, and then adding water and uniformly stirring.
7. The method for preparing wall slurry according to claim 6, wherein the method comprises the following steps: when the main body material of the wall contains cement, adding water and stirring uniformly, and then adding a water reducing agent, wherein the adding amount of the water reducing agent is 0.5-2% of the weight of the cement; the water reducing agent is one of a lignosulfonate water reducing agent, a naphthalene sulfonate water reducing agent or a melamine water reducing agent.
8. The method for preparing wall slurry according to claim 7, wherein the method comprises the following steps: the adding amount of the water reducing agent is 1 percent of the weight of the cement.
9. A barrier reaction wall, which is characterized in that: the wall body slurry of any one of claims 1 to 5 is poured to prepare the barrier reaction wall, and the wall body permeability coefficient of the barrier reaction wall is not more than 10 -7 cm/s, the removal rate of the indicating pollutants is more than 98%, and the indicating pollutants take hexavalent chromium, cadmium and lead in ammonia nitrogen and heavy metals as detection indexes.
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| CN103241792A (en) * | 2013-05-10 | 2013-08-14 | 中山大学 | Permeable reactive wall material and preparation method thereof |
| CN110124609A (en) * | 2019-05-17 | 2019-08-16 | 成都理工大学 | Composite barrier material and preparation method thereof for contaminated site |
| CN110922110A (en) * | 2019-12-17 | 2020-03-27 | 河南省地质环境规划设计院有限公司 | Slurry wall for pollution site separation and pollution site separation control and treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103241792A (en) * | 2013-05-10 | 2013-08-14 | 中山大学 | Permeable reactive wall material and preparation method thereof |
| CN110124609A (en) * | 2019-05-17 | 2019-08-16 | 成都理工大学 | Composite barrier material and preparation method thereof for contaminated site |
| CN110922110A (en) * | 2019-12-17 | 2020-03-27 | 河南省地质环境规划设计院有限公司 | Slurry wall for pollution site separation and pollution site separation control and treatment method |
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