CN115646986A - Method for treating dioxin in municipal solid waste incineration fly ash - Google Patents
Method for treating dioxin in municipal solid waste incineration fly ash Download PDFInfo
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- CN115646986A CN115646986A CN202211333965.3A CN202211333965A CN115646986A CN 115646986 A CN115646986 A CN 115646986A CN 202211333965 A CN202211333965 A CN 202211333965A CN 115646986 A CN115646986 A CN 115646986A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 191
- 239000010813 municipal solid waste Substances 0.000 title claims abstract description 96
- 238000004056 waste incineration Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 62
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 title abstract 7
- 239000000843 powder Substances 0.000 claims abstract description 44
- 238000002386 leaching Methods 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000000227 grinding Methods 0.000 claims abstract description 20
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- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 claims description 122
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 21
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- 239000000203 mixture Substances 0.000 claims description 16
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- 231100000770 Toxic Equivalency Factor Toxicity 0.000 description 2
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Abstract
The invention provides a method for treating dioxin in municipal solid waste incineration fly ash. The method comprises the main steps of washing, grinding, leaching, separating and the like, wherein municipal solid waste incineration fly ash is washed by water or acid, and then is dried and ground to obtain primary fly ash powder to be treated; mixing the primary fly ash powder and fat, fully stirring and standing for a period of time, and leaching dioxin in the fly ash; finally, separating to obtain the treated fly ash. The method can greatly reduce the content of dioxin in the fly ash, and the toxicity equivalent can be reduced by more than 60%. The method provided by the invention has the characteristics of low cost, simple operation, remarkable reduction effect of toxicity equivalent of dioxin and the like, and realizes zero waste liquid flow containing dioxin. Not only provides an idea for solving the potential dioxin leakage risk of the traditional treatment method, but also provides a pretreatment scheme before landfill or resource utilization for better utilization of the fly ash.
Description
Technical Field
The invention relates to the technical field of treatment technology of incineration fly ash of household garbage and treatment and resource utilization of dangerous solid wastes, in particular to a method for treating dioxin in incineration fly ash of municipal solid wastes.
Background
With the development of economy, the annual yield of municipal solid waste also increases year by year, now reaching or exceeding 10 7 Ton/year rating. The common method for treating the municipal solid waste is incineration, and the method has the advantages of reducing the mass and the volume of the municipal solid waste, releasing energy, generating electricity and the like, and is gradually replacing landfill as the preferred method for treating the municipal solid waste. However, incineration of municipal solid waste will produce two main by-products, namely municipal solid waste incineration fly ash and municipal solid waste incineration bottom ash, the two by-products having a mass between 1. The municipal solid waste incineration bottom ash is relatively low in toxicity and can be directly landfilled or directly utilized. Whereas the incineration fly ash of municipal solid waste contains more heavy metals and organic pollutants than bottom ash, especially dioxin, which is known as "century toxicity". Therefore, municipal solid waste incineration fly ash is regarded as a hazardous solid waste that needs to be strictly regulated.
At present, the most common method for treating the fly ash of the municipal solid waste is landfill after cement solidification, but the method cannot remove the dioxin and encapsulates the dioxin in a solidified body, and the dioxin is leaked in the environment in the end along with the aging of the cement solidified body. Another method for treating municipal solid waste incineration fly ash is to use it to produce alkali-activated cementitious material because municipal solid waste incineration fly ash has the properties of a supplementary cementitious material. However, the alkali-activated fly ash from incineration of municipal solid waste cannot remove dioxin either, but the alkali-activated fly ash from incineration of municipal solid waste is packaged in the material as in the cement curing treatment of the fly ash from incineration of municipal solid waste, so that the alkali-activated cementitious material from incineration of municipal solid waste still has the risk of discharging dioxin to the environment. Whether the municipal solid waste incineration fly ash is buried or used for producing a cementitious material, the dioxin content thereof needs to be reduced to meet the national standards. The toluene which can be used for separating dioxin in municipal solid waste incineration fly ash traditionally has toxicity and volatility, and is expensive, so that the toluene is difficult to be a separating agent suitable for separating dioxin on a large scale.
Therefore, the prior art has yet to be improved.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a method for treating dioxin in municipal solid waste incineration fly ash, which aims to solve the potential leakage risk of dioxin in the conventional fly ash treatment method and the problem of lack of a suitable separating agent for separating dioxin on a large scale.
The technical scheme of the invention is as follows:
a method for treating dioxin in incineration fly ash of municipal solid waste, which comprises the following steps:
the method comprises the following steps: washing the municipal solid waste incineration fly ash with water or acid;
step two: grinding the washed incineration fly ash of the municipal solid waste into primary fly ash powder;
step three: leaching dioxin in the primary fly ash powder to obtain a mixture;
step four: and (3) performing solid-liquid separation on the mixture obtained after leaching, drying the separated solid, and grinding the dried solid into powder to obtain treated fly ash powder.
The method for treating dioxin in municipal solid waste incineration fly ash comprises the following raw materials in parts by mass:
10-15 parts of municipal solid waste incineration fly ash
40-80 parts of water or acid
80-140 parts of fat.
The method for treating dioxin in municipal solid waste incineration fly ash is characterized in that the fat is pig fat.
The method for treating dioxin in municipal solid waste incineration fly ash comprises the following specific steps of: washing with clear water or hydrochloric acid with the concentration of 1mol/L for 2 hours.
The method for treating dioxin in municipal solid waste incineration fly ash as described in any one of the above claims, wherein the raw materials are in the following proportions by mass:
10-15 parts of municipal solid waste incineration fly ash
40-80 parts of water or hydrochloric acid
80-140 parts of pig fat.
The method for treating dioxin in municipal solid waste incineration fly ash comprises the following steps: and (3) carrying out solid-liquid separation on the washed municipal solid waste incineration fly ash by using a centrifugal machine, drying the separated solid, and grinding the dried solid into primary fly ash powder by using a grinder.
The method for treating dioxin in municipal solid waste incineration fly ash comprises the following steps: and (3) performing solid-liquid separation on the mixture obtained after leaching by using a centrifugal machine, placing the separated solid on oil absorption paper for drying, and then grinding the dried solid into powder by using a grinder to obtain the treated fly ash powder.
The method for treating dioxin in municipal solid waste incineration fly ash as described in any one of the above, wherein the rotation speed of the centrifuge is 4000r/min, and the centrifugation time is 15 to 30 minutes; the drying temperature is 50-70 ℃, and the drying time is 72-96 hours.
The method for treating dioxin in municipal solid waste incineration fly ash comprises the following steps: mixing the primary fly ash powder with fat, stirring, standing for 8 hours, stirring again, and repeating for 3 times.
The method for treating dioxin in municipal solid waste incineration fly ash comprises the step of standing for 24 hours at the temperature of 60 ℃.
Has the beneficial effects that: the invention provides a method for treating dioxin in municipal solid waste incineration fly ash. The method comprises the main steps of washing, grinding, leaching, separating and the like, wherein municipal solid waste incineration fly ash is washed by water or acid, and then primary fly ash powder to be treated is obtained through drying and grinding; mixing the primary fly ash powder and fat, fully stirring and standing for a period of time, and leaching dioxin in the fly ash; and finally, centrifugally separating to obtain the treated fly ash. The method can greatly reduce the content of dioxin in the fly ash, and the toxicity equivalent can be reduced by more than 60%; the toxicity equivalent of dioxin contained in the fly ash powder obtained after treatment is lower than 30ng TEQ/kg and is smaller than 50ng TEQ/kg specified in the technical Specification for pollution control of fly ash from incineration of household garbage (HJ 1134-2020). The method provided by the invention has the characteristics of low cost, simplicity in operation, remarkable reduction effect of toxicity equivalent of dioxin and the like, provides an idea for solving the potential dioxin leakage risk of the traditional fly ash solidified body dioxin, provides a pretreatment method for better utilizing the fly ash, and can be regarded as a pretreatment scheme before landfill or resource utilization of dangerous waste such as municipal solid waste incineration fly ash.
Drawings
Fig. 1 is a flow chart of a method for treating dioxin in incineration fly ash of municipal solid waste according to an embodiment of the invention.
Detailed Description
The invention provides a method for treating dioxin in municipal solid waste incineration fly ash, and the invention is further explained in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a method for treating dioxin in municipal solid waste incineration fly ash, which comprises the following steps:
s10, washing the municipal solid waste incineration fly ash with water or acid;
s20, grinding the washed municipal solid waste incineration fly ash into primary fly ash powder;
s30, leaching dioxin in the primary fly ash powder to obtain a mixture;
and S40, carrying out solid-liquid separation on the mixture obtained after leaching, drying the separated solid, and grinding the dried solid into powder to obtain treated fly ash powder.
In some embodiments, the fat is porcine fat. But not limited thereto, any other fat having advantages of non-toxicity, innocuity, easy handling, economy and easy availability may be used as a leaching agent for dioxins, such as bovine or ovine fat, or plant-derived fat, etc.
In the embodiment of the invention, fat is selected as the separating agent of dioxin in the fly ash, because the dioxin has good fat solubility, the fat is used for replacing a traditional leaching agent, namely toluene, so as to realize the separation of the dioxin in the fly ash. Previous researches show that 440ng TEQ/kg toxicity equivalent of dioxin exists in the fat of pigs, so that the dioxin has strong leaching capability. For the treatment of the fat of the pigs after leaching the dioxin, the fat containing the dioxin can be used as fuel in a high-temperature waste incineration power plant because the fat of the pigs is flammable, and the dioxin is also decomposed at high temperature, so that the zero waste liquid flow containing the dioxin is realized. Furthermore, the fat of pigs is non-toxic and harmless compared to toluene. Furthermore, the price of the fat of the pig is low, compared with 8000 yuan per ton of toluene, the cost of the fat of 1500 yuan per ton of pig is obviously lower, and the fat is more suitable for large-scale application. Therefore, the embodiment of the invention selects the fat which has good solubility to dioxin, is non-toxic and harmless and has easy waste liquid treatment as the leaching agent for treating the dioxin.
In some embodiments, the raw materials are in the following weight parts:
10-15 parts of municipal solid waste incineration fly ash
40-80 parts of water or acid
80-140 parts of fat.
It has been shown that pig fat can dissolve 440ng TEQ/kg toxic equivalent of dioxin. With the improvement of the waste incineration technology, the toxicity equivalent of dioxin contained in the incineration fly ash of the municipal solid waste at present is 50-200ng TEQ/kg. In order to ensure the leaching efficiency of fat on dioxin in the fly ash, the embodiment of the invention adopts the raw material proportion and can ensure the full contact of the fly ash and the fat. Similarly, methods to ensure adequate contact may also utilize water washing or acid washing of the fly ash to remove soluble materials that may encapsulate the dioxins.
Specifically, the raw materials are as follows according to the mass part ratio:
10-15 parts of municipal solid waste incineration fly ash
40-80 parts of clear water or hydrochloric acid
80-140 parts of pig fat.
In some embodiments, the specific steps of washing with water or acid in step S10 are: washing with clear water or hydrochloric acid with the concentration of 1mol/L for 2 hours.
In the embodiment of the invention, the municipal solid waste incineration fly ash is washed first. The washing with clean water or hydrochloric acid is to wash away the soluble matter coating the dioxin so that more dioxin can contact with fat to improve the efficiency of leaching the dioxin.
In some embodiments, in step S20, the specific steps are: and (3) carrying out solid-liquid separation on the washed municipal solid waste incineration fly ash by using a centrifugal machine, drying the separated solid, and grinding the dried solid into primary fly ash powder by using a grinder.
In the embodiment of the invention, the washed fly ash is ground to increase the contact area between the fly ash and fat and improve the leaching efficiency of dioxin.
Specifically, the rotating speed of the centrifugal machine is 4000r/min, and the centrifugal time is 15-30 minutes; the drying temperature is 50-70 ℃ and the drying time is 72-96 hours, so as to ensure that high-dryness treated fly ash solid is obtained.
In some embodiments, in step S30, the particular steps of leaching are: fully mixing the ground primary fly ash powder with fat, standing for 8 hours after stirring, fully stirring once again, repeating for 3 times, and leaching dioxin in the primary fly ash powder.
In some embodiments, the temperature of leaching is 60 ℃ and the resting time is 24 hours.
In leaching, the fly ash powder and the fat need to be fully mixed to improve the efficiency of leaching the dioxin. Because the fly ash and the fat have density difference, the fly ash sinks to the bottom after the fly ash and the fat are fully mixed for a period of time to cause the two to be layered, and the fly ash can settle at the bottom of the container after being leached for a certain time. Therefore, in order to ensure the leaching efficiency, the fly ash settled on the bottom of the container is fully contacted with the fat again by fully stirring every 8 hours, so that the contact chance of the fly ash and the fat of the pigs is increased, and the leaching efficiency of the dioxin is improved.
According to studies, pig fat can dissolve 440ng TEQ/kg toxicity equivalent of dioxin. With the improvement of the waste incineration technology, the toxicity equivalent of the dioxin contained in the fly ash is 50-200ng TEQ/kg. Therefore, in order to ensure the efficiency of leaching dioxin in the fly ash by fat, the fly ash needs to be ensured to be fully contacted with the fat: firstly, the fly ash is washed by water or acid to remove soluble substances which can wrap dioxin, secondly, the fly ash in the fat is stirred again after being settled so as to ensure that the fly ash is fully contacted with the fat again, and thirdly, the fly ash is leached at the temperature of 60 ℃, so that the thermal motion of fat molecules is aggravated, and the fat is further fully contacted with the fly ash.
In some embodiments, in step S40, the specific steps are: and (3) performing solid-liquid separation on the mixture obtained after leaching by using a centrifugal machine, placing the separated solid on oil absorption paper for drying, and then grinding the dried solid into powder by using a grinder to obtain the treated fly ash powder.
Specifically, the rotating speed of the centrifugal machine is 4000r/min, and the centrifugal time is 15-30 minutes; the drying temperature is 50-70 ℃, and the drying time is 72-96 hours, so as to ensure that high-dryness treated fly ash solid is obtained.
The embodiment of the invention also provides an application of the method for treating the dioxin in the municipal solid waste incineration fly ash, and the method is applied to the separation of the dioxin in the municipal solid waste incineration fly ash.
In some embodiments, the fly ash powder obtained after treatment contains less than 30ng TEQ/kg of toxic equivalent dioxin, which is less than 50ng TEQ/kg specified in the municipal solid waste incineration fly ash pollution control technical Specification (HJ 1134-2020). The method can greatly reduce the content of dioxin in the fly ash, and the toxicity equivalent of the dioxin contained in the fly ash obtained after treatment is reduced by more than 60 percent compared with primary fly ash powder.
Furthermore, since the fat used in the embodiment of the present invention is economical (for example, the fat of swine), a large amount of fly ash can be separated from dioxin in the above-described method, and thus the method of the embodiment can be applied to the large-scale treatment of municipal solid waste incineration fly ash. And the operation is simple, and only the fat and the fly ash are mixed. The waste liquid is easy to treat and does not pollute the environment. The dioxin-containing fat can be used as a fuel for high-temperature waste incineration power plants due to its own flammability, thus not only utilizing waste liquid, but also eliminating dioxin at high temperatures. Therefore, the method provided by the invention has the characteristics of low cost, simplicity in operation, remarkable reduction effect of toxicity equivalent of dioxin and the like, provides an idea for solving the potential dioxin leakage risk of the traditional solidified dioxin, and provides a pretreatment method for better utilization of fly ash.
The method for treating dioxin in incineration fly ash of municipal solid waste according to the present invention is further explained by the following specific examples:
in each example of the present invention, the chemical composition of the incineration fly ash of raw municipal solid waste is shown in table 1, and the relevant parameters of the fat of swine are shown in table 2.
TABLE 1 chemical composition of fly ash (wt%)
TABLE 2 relevant parameters of fat in pigs
Example 1
The raw municipal solid waste incineration fly ash, clear water and pig fat are in parts by weight:
10 portions of municipal solid waste incineration fly ash
40 parts of clear water
80 portions of fat of pig
The dioxin separation is carried out according to the following steps:
firstly, washing original municipal solid waste incineration fly ash with clear water;
step two, after solid-liquid separation is carried out by a centrifugal machine with the rotating speed of 4000r/min, the solid is dried for 72 hours, and the dried fly ash is ground into powder, so that the fly ash has a larger specific surface area, and the efficiency of leaching dioxin is improved;
and step three, fully mixing the ground fly ash and the fat of the pig, standing the mixture for 8 hours, fully stirring the mixture once, and repeating the stirring for three times to improve the efficiency of leaching the dioxin, wherein the leaching temperature is 60 ℃.
Step four, using a centrifuge with the rotation speed of 4000r/min to separate the solid from the liquid in the step three;
step five, drying the fly ash solid obtained by separation in the step four for 72 hours, and grinding the fly ash solid into powder;
and step six, testing the content of the dioxin in the fly ash obtained in the step five according to a determination method of isotope dilution high-resolution gas chromatography-high-resolution mass spectrometry (HJ 77.3-2008) for determining the dioxin in the solid waste determination.
The test result shows that the toxicity equivalent of the dioxin contained in the treated fly ash is 26ng TEQ/kg, and the efficiency of separating the dioxin is 69.76%. Specific results are shown in table 3.
TABLE 3 comparison of total toxicity equivalents of dioxin before and after isolation in example 1 (ng TEQ/kg)
Example 2
The raw municipal solid waste incineration fly ash, 1mol/L hydrochloric acid and pig fat are in parts by mass:
15 portions of municipal solid waste incineration fly ash
60 portions of 1mol/L hydrochloric acid
Pig fat 120 parts
The dioxin separation is carried out according to the following steps:
firstly, washing original municipal solid waste incineration fly ash with 1mol/L hydrochloric acid;
step two, after solid-liquid separation is carried out by a centrifugal machine with the rotating speed of 4000r/min, the solid is dried for 72 hours, and the dried fly ash is ground into powder, so that the fly ash has larger specific surface area, and the efficiency of leaching dioxin is improved;
and step three, fully mixing the ground fly ash and the fat of the pig, standing the mixture for 8 hours, fully stirring the mixture once, and repeating the stirring for three times to improve the efficiency of leaching the dioxin, wherein the leaching temperature is 60 ℃.
Step four, using a centrifuge with the rotating speed of 4000r/min to separate the solid from the liquid in the step three;
step five, drying the fly ash solid obtained by separation in the step four for 72 hours, and grinding the dried fly ash solid into powder;
and step six, testing the content of the dioxin in the fly ash obtained in the step five according to a determination method of isotope dilution high-resolution gas chromatography-high-resolution mass spectrometry (HJ 77.3-2008) for determining the dioxin in the solid waste determination.
The test result shows that the toxicity equivalent of the dioxin contained in the treated fly ash is 25ng TEQ/kg, and the efficiency of separating the dioxin is 64.79 percent. Specific results are shown in table 4.
TABLE 4 comparison of total toxicity equivalents of dioxin before and after isolation in example 2 (ng TEQ/kg)
Example 3
The weight portions of the incineration fly ash of the original municipal solid waste and the fat of the pig are as follows:
12 portions of municipal solid waste incineration fly ash
Pig fat 96 portions
The dioxin separation is carried out according to the following steps:
grinding the dried fly ash into powder, so that the fly ash has a larger specific surface area, and the efficiency of leaching dioxin is improved;
step two, fully mixing the ground fly ash and the fat of the pigs, standing for 8 hours, fully stirring the mixture once again, repeating for three times to improve the efficiency of leaching the dioxin, wherein the leaching temperature is 60 ℃;
thirdly, using a centrifuge with the rotating speed of 4000r/min to separate the solid from the liquid in the third step;
step four, drying the fly ash solid obtained by separation in the step four for 72 hours, and grinding the fly ash solid into powder;
and step five, testing the dioxin content in the fly ash obtained in the step five according to a determination method of isotope dilution high-resolution gas chromatography-high-resolution mass spectrometry (HJ 77.3-2008) for determining dioxin in solid waste.
Test results show that the treated fly ash contains 18ng TEQ/kg of toxicity equivalent of dioxin, and the efficiency of separating the dioxin is 69.5%. Specific results are shown in table 5.
TABLE 5 comparison of total toxicity equivalents of dioxin before and after isolation in example 3 (ng TEQ/kg)
According to the test method of isotope dilution high resolution gas chromatography-high resolution mass spectrometry for determining dioxins in solid waste (HJ 77.3-2008), toxicity equivalent test of dioxins content was performed on the raw municipal solid waste incineration fly ash and the treated fly ash in examples 1-3, and the comparison results are shown in table 6:
TABLE 6 comparison of the total toxicity equivalents (ng TEQ/kg) contained in fly ash before and after fat extraction in pigs in each example
According to the embodiment of the invention, the fat of the pig is used as a separating agent, the fat of the pig is mixed with the municipal solid waste incineration fly ash, and the oil is separated from the municipal solid waste incineration fly ash by utilizing a centrifugal speed of 4000r/min after 24-30 hours, so that the municipal solid waste incineration fly ash is separated from dioxin, and the municipal solid waste incineration fly ash can be better buried or utilized. The toxicity equivalent of dioxin contained in the fly ash powder obtained after treatment is lower than 30ng TEQ/kg and is smaller than 50ng TEQ/kg specified in the technical Specification for pollution control of fly ash from incineration of household garbage (HJ 1134-2020). The method can greatly reduce the content of dioxin in the fly ash, and the toxicity equivalent of the dioxin contained in the fly ash obtained after treatment is reduced by more than 60 percent compared with primary fly ash powder.
In conclusion, the invention provides a method for treating dioxin in municipal solid waste incineration fly ash. The method comprises the main steps of washing, grinding, leaching, separating and the like, wherein municipal solid waste incineration fly ash is washed by water or acid, and then is dried and ground to obtain primary fly ash powder to be treated; mixing the primary fly ash powder and fat, fully stirring and standing for a period of time, and leaching dioxin in the fly ash; and finally, centrifugally separating to obtain the treated fly ash. The method can greatly reduce the content of dioxin in the fly ash, and the toxicity equivalent can be reduced by more than 60%. The toxicity equivalent of dioxin contained in the fly ash powder obtained after treatment is lower than 30ng TEQ/kg and is smaller than 50ng TEQ/kg specified in the technical Specification for controlling pollution of fly ash from incineration of household garbage (HJ 1134-2020). The method of the invention realizes the separation of dioxin which is difficult to treat in the municipal solid waste incineration fly ash, so that the fly ash can be better treated or utilized; the separation method uses the pig fat as a separating agent of the dioxin, effectively reduces the toxicity equivalent of the dioxin in the incineration fly ash of the original municipal solid waste, reduces the toxicity of the fly ash, and uses the pig fat as a leaching agent, so that the cost is low. Furthermore, since dioxin is hardly soluble in water or hydrochloric acid and the fat of swine used for leaching dioxin can be used as a fuel for incineration, a zero waste liquid stream containing dioxin is realized compared to conventional leaching agents. Therefore, the method provided by the invention has the characteristics of low cost, simplicity in operation, remarkable reduction effect of toxicity equivalent of dioxin and the like, provides an idea for solving the potential dioxin leakage risk of the traditional fly ash solidified body dioxin, provides a pretreatment method for better utilization of the fly ash, and can be regarded as a pretreatment scheme before landfill or resource utilization of dangerous waste such as municipal solid waste incineration fly ash.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A method for treating dioxin in incineration fly ash of municipal solid waste is characterized by comprising the following steps:
the method comprises the following steps: washing the municipal solid waste incineration fly ash with water or acid;
step two: grinding the washed incineration fly ash of the municipal solid waste into primary fly ash powder;
step three: leaching dioxin in the primary fly ash powder to obtain a mixture;
step four: and (3) performing solid-liquid separation on the mixture obtained after leaching, drying the separated solid, and grinding the dried solid into powder to obtain treated fly ash powder.
2. The method for treating dioxin in municipal solid waste incineration fly ash according to claim 1, characterized in that the raw materials are, in parts by mass:
10-15 parts of municipal solid waste incineration fly ash
40-80 parts of water or acid
80-140 parts of fat.
3. The method for treating dioxin in incineration fly ash of municipal solid waste according to claim 1, characterized in that the fat is porcine fat.
4. The method for treating dioxin in incineration fly ash of municipal solid waste according to claim 1, wherein in the first step, the washing with water or acid comprises the specific steps of: washing with clear water or hydrochloric acid with concentration of 1mol/L for 2 hours.
5. The method for treating dioxin in incineration fly ash of municipal solid waste according to any one of claims 1 to 4, characterized in that the raw materials are, in parts by mass:
10-15 parts of municipal solid waste incineration fly ash
40-80 parts of water or hydrochloric acid
80-140 parts of pig fat.
6. The method for treating dioxin in incineration fly ash of municipal solid waste according to claim 1, wherein step two is specifically: and (3) carrying out solid-liquid separation on the washed municipal solid waste incineration fly ash by using a centrifugal machine, drying the separated solid, and grinding the dried solid into primary fly ash powder by using a grinder.
7. The method for treating dioxins in municipal solid waste incineration fly ash according to claim 1, wherein the fourth step is specifically: and (3) performing solid-liquid separation on the mixture obtained after leaching by using a centrifugal machine, placing the separated solid on oil absorption paper for drying, and then grinding the dried solid into powder by using a grinder to obtain the treated fly ash powder.
8. The method for treating dioxin in incineration fly ash of municipal solid waste according to claim 6 or 7, characterized in that the rotation speed of the centrifuge is 4000r/min and the centrifugation time is 15 to 30 minutes; the drying temperature is 50-70 ℃, and the drying time is 72-96 hours.
9. The method for treating dioxins in municipal solid waste incineration fly ash according to claim 1, wherein said step three is specifically: mixing the primary fly ash powder with fat, stirring, standing for 8 hours, stirring again, and repeating for 3 times.
10. The method for treating dioxins in municipal solid waste incineration fly ash according to claim 9, wherein the temperature of the leaving treatment is 60 ℃ and the leaving time is 24 hours.
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