CN108721824A - The method of incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons - Google Patents
The method of incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons Download PDFInfo
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- CN108721824A CN108721824A CN201810495561.1A CN201810495561A CN108721824A CN 108721824 A CN108721824 A CN 108721824A CN 201810495561 A CN201810495561 A CN 201810495561A CN 108721824 A CN108721824 A CN 108721824A
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- heavy metal
- incineration
- polycyclic aromatic
- flying dust
- aromatic hydrocarbons
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
- A62D3/38—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by oxidation; by combustion
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/10—Destroying solid waste or transforming solid waste into something useful or harmless involving an adsorption step
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/08—Toxic combustion residues, e.g. toxic substances contained in fly ash from waste incineration
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/20—Organic substances
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/40—Inorganic substances
- A62D2101/43—Inorganic substances containing heavy metals, in the bonded or free state
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/30—Incineration ashes
-
- 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
- Y02W30/20—Waste processing or separation
Abstract
A kind of method of incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons, includes the following steps：1) it pre-processes：Flying dust is ground, its grain size is made to be less than or equal to 80 μm；2) it allocates：Sial conditioner will be added in flying dust after pretreatment obtains mixing ash sample, hot water is added into mixing ash sample, mixed liquor is obtained after 8~10h of agitated excitation, the generation requirement of calcium, silicon in the mixed liquor and the molar content between aluminium element than meeting zeolites aluminosilicate mineral tobermorite, and in the mixed liquor water with mix ash sample liquid-solid ratio be 5~10:1mL/g；3) hydro-thermal reaction：The mixed liquor is added to closed hydrothermal reaction kettle, and is pumped into hydrogen peroxide into hydrothermal reaction kettle, is then warming up to 150~200 DEG C of hydro-thermal reactions；Wherein, the mass fraction of the hydrogen peroxide is 30%, and the hydrogen peroxide is 0.25~1mL/g with the liquid-solid ratio for mixing ash sample；4) it detaches：The product obtained after hydro-thermal reaction is subjected to dehydration separation, obtains solid product and waste liquid.
Description
Technical field
The invention belongs to the processing technology fields of solid waste, are specifically a kind of incineration of refuse flyash synchronism stability huge sum of money
Belong to the method with degrading polycyclic aromatic hydrocarbons.
Background technology
Burning method has become the processing method that rubbish generally uses, other waste treatment methods is compared, such as landfill method, compost
Method etc., burning method can reduce Waste volume 90%, reduce quality 60~70%.In addition, burning method can decompose it is toxic, harmful
Waste is converted to nontoxic, harmless simple compounds, while can effectively recycle energy resources, and the heat generated can be used for
It is the optimal selection for handling the solid refuses such as house refuse, medical waste for heat and generating power.
After incineration treatment of garbage, it will produce and be equivalent to a certain number of flying dusts.Flying dust refers to the flue gas in garbage burning factory
Purification system and recuperation of heat utilize residue obtained by being collected in system (such as economizer, waste heat boiler etc.), including cigarette ash, injection
Adsorbent, flue gas condensed product and reaction product etc..The yield of flying dust is about 3~5% of garbage treatment quantity or so.
Since flying dust has complicated surface characteristic, it is enriched with and forms a large amount of poisonous and harmful substance, such as high concentration soluble-salt
Substance, the heavy metal of high leaching concentration and high toxicity Polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbon (PAHs), dioxins materials
(PCDDs/Fs) the persistence hardly degraded organic substance such as.Therefore, flying dust is clearly included in China《National Hazard waste register》
(HW18).To sum up, it is protruded the most in the secondary pollution that Refuse Incineration Process generates and extremely urgent problem is exactly rubbish
The processing handling problems of flying ash.For to a certain extent, the terminal of rubbish processing to be harmless should be that final realization rubbish is burnt
Burn the innoxious of flying dust.
Since China's Waste sorting recycle system is not perfect and it is not in place to implement, lead to waste material of the part containing heavy metal
Expect that (old and useless battery, electronic component, thermometer etc.) enters house refuse.Heavy metal and heavy metal compound quilt during the burning process
Flue gas is evaporated into, flue gas enters the flue of temperature relatively low (400~500 DEG C) from the burner hearth of temperature higher (800~1000 DEG C)
When, cooling drastically makes heavy metal is concentrated from flue gas to come out, and to which adsorpting aggregation occur on fly ash granule surface, flies in addition
Ash has larger specific surface area and porosity, causes to contain plurality of heavy metal substance in flying dust.Generally speaking, waste incineration flies
The content of the heavy metals such as Pb, Zn, Cu, Cr, Cd is higher in ash, accounting reach incineration of refuse flyash total amount 1~2%, wherein Pb,
The content of Zn is most.Heavy Metal Pollution in flying dust is that its total amount is big and the overwhelming majority exists in the form of unstable,
Heavy metal easily enters in soil and water body under acid or reductive condition.Since the overwhelming majority cannot be disappeared by decomposing and destroying
Remove, if therefore incineration of refuse flyash do not deal carefully with, once soil or water body it is contaminated by heavy metals be just difficult net by itself
Change effect is eliminated, and the pollution so as to cause soil and water environment increasingly sharpens.In addition, heavy metal easily gathers in vivo
Collection is included in fish, shrimp, crops etc. and is enriched in vivo, the mankind by the edible vegetables containing heavy metal or fishes and shrimps make heavy metal into
Enter in vivo, through accumulation after a period of time, high risks will be caused to health.
Due to containing the plastics such as polystyrene, polypropylene, the high temperature ring burned in house refuse, medical waste etc. in addition
Border and the case where there are imperfect combustions, will produce polycyclic aromatic hydrocarbon (Polycyclic Aromatic in Refuse Incineration Process
Hydrocarbons, PAHs).PAHs is initially generated in the gas phase of burning, due to the surface characteristic of fly ash granule, is finally inhaled
It is attached, absorb or be wrapped in fly ash granule.PAHs homologues largely have stronger toxicity, are that typical three causes substance (causes
Cancer, teratogenesis, mutagenesis).The toxicity size and molecular weight, number of rings and molecular structure of PAHs homologues are closely related, different PAHs
Toxicity differ greatly.By Environmental Protection in America portion (United States Environmental Protection Agency,
USEPA PAHs that 16 kinds) proposed first preferentially detect (2 rings~6 ring), is approved, toxicity is big by world community mechanism for monitoring
And be not easily decomposed, benzo [a] pyrene, dibenzo [a, h] anthracene which includes toxic equivalency factor for 1, toxic equivalency factor is
0.1 benzo [a] anthracene, benzo [b] fluoranthene, benzo [k] fluoranthene, indenes [1,2,3-cd] pyrene.Due to the lipophilicity and inertia of PAHs,
Can exist in environment and the ecosystem for a long time so that its environmental ecology risk bigger.How safely and effectively to locate
PAHs substances in reason incineration of refuse flyash have become the environment that need currently solve and social concern.But at this stage, including I
Not clear stipulaties PAHs emission limits in the cinder from refuse incineration pollutant emission standard of countries in the world including state, compared to
It is also relatively fewer to the innoxious research of PAHs in incineration of refuse flyash for heavy metal.
Invention content
In view of this, the purpose of the present invention is to provide a kind of incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic
The method of aromatic hydrocarbons synchronizes the technical purpose realized and stablize heavy metal and polycyclic aromatic hydrocarbon in removal flying dust in flying dust using hydro-thermal method.
In order to achieve the above objectives, the present invention provides the following technical solutions：
A kind of method of incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons, includes the following steps：
1) it pre-processes：Flying dust is ground, its grain size is made to be less than or equal to 80 μm；
2) it allocates：Sial conditioner is added in flying dust after pretreatment and obtains mixing ash sample, is added into mixing ash sample
Enter hot water, mixed liquor, calcium, silicon in the mixed liquor and mole between aluminium element are obtained after 8~10h of agitated excitation
Generation requirement of the content than meeting zeolites aluminosilicate mineral tobermorite, and in the mixed liquor water with mix ash sample
Liquid-solid ratio is 5~10:1mL/g；
3) hydro-thermal reaction：The mixed liquor is added to closed hydrothermal reaction kettle, is pumped into hydrothermal reaction kettle double
Oxygen water is then warming up to 150~200 DEG C of hydro-thermal reactions；The hydrogen peroxide and the liquid-solid ratio for mixing ash sample be 0.25~
1mL/g；
4) it detaches：The product obtained after hydro-thermal reaction is subjected to dehydration separation, obtains solid product and waste liquid.
Further, the sial conditioner uses SiO2And Al2O3, calcium, silicon in the mixed liquor and between aluminium element
Molar content than molar ratio meet：
n(CaO)/n(SiO2+AlO1.5)=0.60~1.73,
n(AlO1.5)/n(SiO2+AlO1.5)=0~0.31；
Further, the hot water is using fresh water or the waste liquid or using the mixing water of fresh water and the waste liquid.
Further, in the step 2), the temperature of the hot water of addition is 70~90 DEG C, and pH value is 10~12.
Further, in the step 4), the product that obtains after hydro-thermal reaction is first carried out at dehydration after waste heat recovery again
Reason.
Further, the heat obtained through waste heat recovery is for drying the solid product and/or the heating hot water.
Further, the time of the hydro-thermal reaction is 12~18 hours.
Further, in the step 2), crystal seed, the quality percentage of crystal seed and flying dust are added in flying dust after pretreatment
Than being 1~3%.
Further, the crystal seed uses artificial tobermorite crystal seed.
The beneficial effects of the present invention are：
The method of the incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons of the present invention, by waste incineration
Sial conditioner and water are added in flying dust, the ratio of the molar content between the calcium in mixed liquor, silicon and aluminium element is made to meet zeolite
The generation requirement of class aluminosilicate mineral tobermorite, i.e., the molar content ratio between calcium, silicon and aluminium element meet n (CaO)/n
(SiO2+AlO1.5)=0.60~1.73, n (AlO1.5)/n(SiO2+AlO1.5)=0~0.31；Water is carried out after agitated excitation again
Thermal response, you can prepare zeolites aluminosilicate mineral, there is extremely strong object to heavy metal using zeolites aluminosilicate mineral
The principles such as Physicochemical absorption, ion exchange, physics trapping, to stablize the heavy metal in flying dust, and, effect good with stablizing effect
The high advantage of rate；By adding hydrogen peroxide in hydrothermal reaction kettle, in hydrothermal reaction process hydrogen peroxide as oxidant to more
Cycloaromatics is aoxidized, and polycyclic aromatic hydrocarbon oxidative degradation is made, and then the content for reducing the polycyclic aromatic hydrocarbon in flying dust is removed up to basic
Polycyclic aromatic hydrocarbon in flying dust；To sum up, the method for incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons of the invention
Using hydro-thermal method, the technical purpose of the heavy metal in stable flying dust and the polycyclic aromatic hydrocarbon in degradation flying dust can be realized simultaneously.
Description of the drawings
In order to keep the purpose of the present invention, technical solution and advantageous effect clearer, the present invention provides following attached drawing and carries out
Explanation：
Fig. 1 is the functional block diagram of the method for incineration of refuse flyash synchronism stability heavy metal of the present invention and degrading polycyclic aromatic hydrocarbons.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments, so that those skilled in the art can be with
It is better understood from the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Embodiment 1
The method of the incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons of the present embodiment, including walk as follows
Suddenly：
1) it pre-processes：Flying dust in flying dust storehouse is transferred in flour mill, flying dust is ground using flour mill, makes its grain size etc.
In 80 μm；
2) it allocates：Flying dust after pretreatment is transferred to stirring premixed device, and adds sial tune in stirring premixed device
Manage agent and hot water, agitated excitation obtains mixed liquor after 10 hours, calcium, silicon in the mixed liquor and between aluminium element
Generation requirement of the molar content than meeting zeolites aluminosilicate mineral tobermorite, and water and combination ash in the mixed liquor
The liquid-solid ratio of sample is 10:1mL/g；Wherein, sial conditioner is configured through sial conditioner measurer, the sial conditioning of the present embodiment
Agent uses SiO2、Al2O3.Calcium, silicon in mixed liquor and the ratio molar ratio of the molar content between aluminium element meet：n(CaO)/n
(SiO2+AlO1.5)=1.73, n (AlO1.5)/n(SiO2+AlO1.5) it is approximately equal to 0.Hot water is using the mixed of fresh water and the waste liquid
Heshui, and after the heated device heating of hot water, temperature is 90 DEG C, and it is 10 to allocate pH value.Specifically, the present embodiment is preprocessed
Crystal seed is added in flying dust afterwards, the mass percent of crystal seed and flying dust is 1%, and the crystal seed of the present embodiment uses artificial snow silico-calcium
Stone crystal seed.
3) hydro-thermal reaction：The mixed liquor is added to closed hydrothermal reaction kettle, and is utilized in hydrothermal reaction kettle
Force (forcing) pump is pumped into hydrogen peroxide, is then warming up to 150 DEG C of hydro-thermal reactions 12 hours；Wherein, the mass fraction of hydrogen peroxide is 30%, institute
It is 0.5mL/g that hydrogen peroxide, which is stated, with the liquid-solid ratio for mixing ash sample.
4) it detaches：By the product obtained after hydro-thermal reaction first with waste-heat recoverer recovery waste heat, then it is dehydrated again
It handles, solid product and waste liquid is obtained after dehydration.Solid product is placed in heating, drying device, and finished product is transferred to after drying
Storehouse.In waste collection to liquid waste collector, the hot water of the present embodiment uses the mixing water of fresh water and the waste liquid, i.e. waste liquid to receive
Waste liquid in storage mixes after being transferred to heater with fresh water, and adjusting proportioning makes the pH of hot water be 10, then adds stirring
Premixed device.Certainly, hot water can also all use fresh water, if liquid-solid ratio and pH value are met the requirements, hot water can also be whole
Using waste liquid, principle is suitable, is not repeated.Specifically, the heat obtained through waste heat recovery is delivered to heating, drying device and is used for
It dries the solid product and is delivered to heater for heating the water.
The present embodiment flying dust is that medical refuse burning flyash reaches it is characterized in that 16 kinds of polycyclic aromatic hydrocarbon total contents are higher
33.71mg/Kg, toxic equivalent are also up to 3.75TEQ-mg/Kg；The leaching concentration of Pb, Zn are higher in heavy metal, and wherein Pb is exceeded
2.4 again.The variation of the Leaching Heavy Metals and polycyclic aromatic hydrocarbon of flying dust and its hydrothermal product is as shown in Table 1 and Table 2.Use this
After example process, the leaching concentration of Pb, Zn, Cu, Cr, Cd significantly reduce in flying dust, are below hazardous waste judging standard
It is worth (GB5085.3-2007), wherein the leaching concentration of Pb, Zn reduce by 88.3%, 91.51%；16 kinds of the medical treatment flying dust are polycyclic
Aromatic hydrocarbons total content is reduced to 12.08mg/Kg, toxic equivalent to be reduced to 1.05TEQ-mg/Kg, reduces by 64.4%, 72.0% respectively.
The technique is synchronous and efficiently realizes the stabilization of fly ash of medical waste heavy metal and the degradation of polycyclic aromatic hydrocarbon.
The Leaching Heavy Metals of 1 flying dust of table before and after the processing
| Index | Pb | Zn | Cu | Cr | Cd |
| The Leaching of Heavy Metals concentration (mg/L) of original flying dust | 17.31 | 14.51 | 6.24 | 0.13 | 1.98 |
| The Leaching of Heavy Metals concentration (mg/L) of flying dust after hydro-thermal process | 2.02 | 1.23 | 0.84 | 0.02 | 0.08 |
| Hazardous waste judging standard value (GB5085.3-2007) (mg/L) | 5 | 100 | 100 | 15 | 1 |
The 16 kinds of PAHs congener contents of 2 flying dust of table before and after the processing are distributed (mg/Kg) and toxic equivalent
Embodiment 2
The method of the incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons of the present embodiment, including walk as follows
Suddenly：
1) it pre-processes：Flying dust in flying dust storehouse is transferred in flour mill, flying dust is ground using flour mill, makes its grain size etc.
In 75 μm；
2) it allocates：Flying dust after pretreatment is transferred to stirring premixed device, and adds sial tune in stirring premixed device
Manage agent and hot water, agitated excitation obtains mixed liquor after 9 hours, calcium, silicon in the mixed liquor and between aluminium element
Generation requirement of the molar content than meeting zeolites aluminosilicate mineral tobermorite, and water and combination ash in the mixed liquor
The liquid-solid ratio of sample is 8:1mL/g；Wherein, sial conditioner is configured through sial conditioner measurer, the sial conditioning of the present embodiment
Agent uses SiO2、Al2O3.Calcium, silicon in mixed liquor and the ratio molar ratio of the molar content between aluminium element meet：n(CaO)/n
(SiO2+AlO1.5)=1.25, n (AlO1.5)/n(SiO2+AlO1.5)=0.31.Hot water uses the mixing of fresh water and the waste liquid
Water, and after the heated device heating of hot water, temperature is 70 DEG C, and it is 12 to allocate pH value.Specifically, the present embodiment is after pretreatment
Flying dust in be added with crystal seed, the mass percent of crystal seed and flying dust is 3%, and the crystal seed of the present embodiment uses artificial tobermorite
Crystal seed.
3) hydro-thermal reaction：The mixed liquor is added to closed hydrothermal reaction kettle, and is utilized in hydrothermal reaction kettle
Force (forcing) pump is pumped into hydrogen peroxide, is then warming up to 180 DEG C of hydro-thermal reactions 18 hours；Wherein, the mass fraction of hydrogen peroxide is 30%, institute
It is 0.25mL/g that hydrogen peroxide, which is stated, with the liquid-solid ratio for mixing ash sample.
4) it detaches：By the product obtained after hydro-thermal reaction first with waste-heat recoverer recovery waste heat, then it is dehydrated again
It handles, solid product and waste liquid is obtained after dehydration.Solid product is placed in heating, drying device, and finished product is transferred to after drying
Storehouse.In waste collection to liquid waste collector, the hot water of the present embodiment uses the mixing water of fresh water and the waste liquid, i.e. waste liquid to receive
Waste liquid in storage mixes after being transferred to heater with fresh water, and adjusting proportioning makes the pH of hot water be 12, then adds stirring
Premixed device.Specifically, the heat obtained through waste heat recovery is delivered to heating, drying device for drying the solid product and conveying
To heater for heating the water.
The present embodiment flying dust is that medical refuse burning flyash reaches it is characterized in that 16 kinds of polycyclic aromatic hydrocarbon total contents are higher
33.71mg/Kg, toxic equivalent are also up to 3.75TEQ-mg/Kg；The leaching concentration of Pb, Zn are higher in heavy metal, and wherein Pb is exceeded
2.4 again.The variation of the Leaching Heavy Metals and polycyclic aromatic hydrocarbon of flying dust and its hydrothermal product is as shown in Table 3 and Table 4.Use this
After example process, the leaching concentration of Pb, Zn, Cu, Cr, Cd significantly reduce in flying dust, are below hazardous waste judging standard
It is worth (GB5085.3-2007), wherein the leaching concentration of Pb, Zn reduce by 90.1%, 85.3%；16 kinds of polycyclic virtues of the medical treatment flying dust
Hydrocarbon total content is reduced to 6.60mg/Kg, toxic equivalent to be reduced to 0.81TEQ-mg/Kg, reduces by 80.4%, 78.4% respectively.It should
Technique is synchronous and efficiently realizes the stabilization of fly ash of medical waste heavy metal and the degradation of polycyclic aromatic hydrocarbon.
The Leaching Heavy Metals of 3 flying dust of table before and after the processing
| Index | Pb | Zn | Cu | Cr | Cd |
| The Leaching of Heavy Metals concentration (mg/L) of original flying dust | 17.31 | 14.51 | 6.24 | 0.13 | 1.98 |
| The Leaching of Heavy Metals concentration (mg/L) of flying dust after hydro-thermal process | 1.72 | 2.13 | 0.65 | 0.04 | 0.07 |
| Hazardous waste judging standard value (GB5085.3-2007) (mg/L) | 5 | 100 | 100 | 15 | 1 |
The 16 kinds of PAHs congener contents of 4 flying dust of table before and after the processing are distributed (mg/Kg) and toxic equivalent
Embodiment 3
The method of the incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons of the present embodiment, including walk as follows
Suddenly：
1) it pre-processes：Flying dust in flying dust storehouse is transferred in flour mill, flying dust is ground using flour mill, makes its grain size etc.
In 77 μm；
2) it allocates：Flying dust after pretreatment is transferred to stirring premixed device, and adds sial tune in stirring premixed device
Manage agent and hot water, agitated excitation obtains mixed liquor after 10 hours, calcium, silicon in the mixed liquor and between aluminium element
Generation requirement of the molar content than meeting zeolites aluminosilicate mineral tobermorite, and water and combination ash in the mixed liquor
The liquid-solid ratio of sample is 5:1mL/g；Wherein, sial conditioner is configured through sial conditioner measurer, the sial conditioning of the present embodiment
Agent uses SiO2、Al2O3.Calcium, silicon in mixed liquor and the ratio molar ratio of the molar content between aluminium element meet：n(CaO)/n
(SiO2+AlO1.5)=0.60, n (AlO1.5)/n(SiO2+AlO1.5)=0.31.Hot water uses the mixing of fresh water and the waste liquid
Water, and after the heated device heating of hot water, temperature is 70 DEG C, and it is 12 to allocate pH value.Specifically, the present embodiment is after pretreatment
Flying dust in without adding crystal seed.
3) hydro-thermal reaction：The mixed liquor is added to closed hydrothermal reaction kettle, and is utilized in hydrothermal reaction kettle
Force (forcing) pump is pumped into hydrogen peroxide, is then warming up to 150 DEG C of hydro-thermal reactions 12 hours；Wherein, the mass fraction of hydrogen peroxide is 30%, institute
It is 1mL/g that hydrogen peroxide, which is stated, with the liquid-solid ratio for mixing ash sample.
4) it detaches：By the product obtained after hydro-thermal reaction first with waste-heat recoverer recovery waste heat, then it is dehydrated again
It handles, solid product and waste liquid is obtained after dehydration.Solid product is placed in heating, drying device, and finished product is transferred to after drying
Storehouse.In waste collection to liquid waste collector, the hot water of the present embodiment uses the mixing water of fresh water and the waste liquid, i.e. waste liquid to receive
Waste liquid in storage mixes after being transferred to heater with fresh water, and adjusting proportioning makes the pH of hot water be 12, then adds stirring
Premixed device.Specifically, the heat obtained through waste heat recovery is delivered to heating, drying device for drying the solid product and conveying
To heater for heating the water.
The present embodiment flying dust is domestic garbage incineration flyash, it is characterized in that 16 kinds of polycyclic aromatic hydrocarbon total contents and toxic equivalent phase
It is slightly lower compared with medical refuse burning flyash, respectively 2268.6 μ g/Kg, 26.91TEQ- μ g/Kg；The leaching of Pb, Zn in heavy metal
Concentration is higher, exceeded 2 times of wherein Pb.The variation such as table of the Leaching Heavy Metals and polycyclic aromatic hydrocarbon of flying dust and its hydrothermal product
5 and table 6 shown in.After this example process, the leaching concentration of Pb, Zn, Cu, Cr, Cd significantly reduce in flying dust, are below
Hazardous waste judging standard value (GB5085.3-2007), the wherein leaching concentration of Pb, Zn reduce by 95.5%, 79.4%；The medical treatment
16 kinds of polycyclic aromatic hydrocarbon total contents of flying dust are reduced to 620.38 μ g/Kg, toxic equivalent to be reduced to 1.66TEQ- μ g/Kg, drop respectively
Low 75.8%, 93.8%.The technique is synchronous and efficiently realizes the stabilization of fly ash of medical waste heavy metal and polycyclic aromatic hydrocarbon
Degradation.
The Leaching Heavy Metals of 5 flying dust of table before and after the processing
| Index | Pb | Zn | Cu | Cr | Cd |
| The Leaching of Heavy Metals concentration (mg/L) of original flying dust | 10.40 | 1.60 | 0.30 | 0.70 | 0.11 |
| The Leaching of Heavy Metals concentration (mg/L) of flying dust after hydro-thermal process | 0.47 | 0.33 | 0.13 | 0.36 | 0.04 |
| Hazardous waste judging standard value (GB5085.3-2007) (mg/L) | 5 | 100 | 100 | 15 | 1 |
The 16 kinds of PAHs congener contents of 6 flying dust of table before and after the processing are distributed (μ g/Kg) and toxic equivalent
Embodiment 4
The method of the incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons of the present embodiment, including walk as follows
Suddenly：
1) it pre-processes：Flying dust in flying dust storehouse is transferred in flour mill, flying dust is ground using flour mill, makes its grain size etc.
In 70 μm；
2) it allocates：Flying dust after pretreatment is transferred to stirring premixed device, and adds sial tune in stirring premixed device
Manage agent and hot water, agitated excitation obtains mixed liquor after 8 hours, calcium, silicon in the mixed liquor and between aluminium element
Generation requirement of the molar content than meeting zeolites aluminosilicate mineral tobermorite, and water and combination ash in the mixed liquor
The liquid-solid ratio of sample is 7.5:1mL/g；Wherein, sial conditioner is configured through sial conditioner measurer, the sial tune of the present embodiment
It manages agent and uses SiO2、Al2O3.Calcium, silicon in mixed liquor and the ratio molar ratio of the molar content between aluminium element meet：n(CaO)/
n(SiO2+AlO1.5)=1.73, n (AlO1.5)/n(SiO2+AlO1.5) it is equal to 0.10.Hot water is using fresh water and the waste liquid
Mixing water, and after the heated device heating of hot water, temperature is 80 DEG C, and it is 11 to allocate pH value.Specifically, the present embodiment is through pre- place
Crystal seed is added in flying dust after reason, the mass percent of crystal seed and flying dust is 2%, and the crystal seed of the present embodiment uses artificial snow silicon
Calcium stone crystal seed.
3) hydro-thermal reaction：The mixed liquor is added to closed hydrothermal reaction kettle, and is utilized in hydrothermal reaction kettle
Force (forcing) pump is pumped into hydrogen peroxide, is then warming up to 200 DEG C of hydro-thermal reactions 15 hours；Wherein, the mass fraction of hydrogen peroxide is 30%, institute
It is 1mL/g that hydrogen peroxide, which is stated, with the liquid-solid ratio for mixing ash sample.
4) it detaches：By the product obtained after hydro-thermal reaction first with waste-heat recoverer recovery waste heat, then it is dehydrated again
It handles, solid product and waste liquid is obtained after dehydration.Solid product is placed in heating, drying device, and finished product is transferred to after drying
Storehouse.In waste collection to liquid waste collector, the hot water of the present embodiment uses the mixing water of fresh water and the waste liquid, i.e. waste liquid to receive
Waste liquid in storage mixes after being transferred to heater with fresh water, and adjusting proportioning makes the pH of hot water be 11, then adds stirring
Premixed device.Specifically, the heat obtained through waste heat recovery is delivered to heating, drying device for drying the solid product and conveying
To heater for heating the water.
The present embodiment flying dust is domestic garbage incineration flyash, it is characterized in that 16 kinds of polycyclic aromatic hydrocarbon total contents and toxic equivalent phase
It is slightly lower compared with medical refuse burning flyash, respectively 2268.6 μ g/Kg, 26.91TEQ- μ g/Kg；The leaching of Pb, Zn in heavy metal
Concentration is higher, exceeded 2 times of wherein Pb.The variation such as table of the Leaching Heavy Metals and polycyclic aromatic hydrocarbon of flying dust and its hydrothermal product
7 and table 8 shown in.After this example process, the leaching concentration of Pb, Zn, Cu, Cr, Cd significantly reduce in flying dust, are below
Hazardous waste judging standard value (GB5085.3-2007), the wherein leaching concentration of Pb, Zn reduce by 96.8%, 87.5%；The medical treatment
16 kinds of polycyclic aromatic hydrocarbon total contents of flying dust are reduced to 446.44 μ g/Kg, toxic equivalent to be reduced to 1.50TEQ- μ g/Kg, drop respectively
Low 80.3%, 94.4%.The technique is synchronous and efficiently realizes the stabilization of fly ash of medical waste heavy metal and polycyclic aromatic hydrocarbon
Degradation.
The Leaching Heavy Metals of 7 flying dust of table before and after the processing
| Index | Pb | Zn | Cu | Cr | Cd |
| The Leaching of Heavy Metals concentration (mg/L) of original flying dust | 10.40 | 1.60 | 0.30 | 0.70 | 0.11 |
| The Leaching of Heavy Metals concentration (mg/L) of flying dust after hydro-thermal process | 0.34 | 0.22 | 0.06 | 0.14 | 0.03 |
| Hazardous waste judging standard value (GB5085.3-2007) (mg/L) | 5 | 100 | 100 | 15 | 1 |
The 16 kinds of PAHs congener contents of 8 flying dust of table before and after the processing are distributed (μ g/Kg) and toxic equivalent
The upper embodiment is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection scope of the present invention
It is without being limited thereto.Those skilled in the art on the basis of the present invention made by equivalent substitute or transformation, the present invention
Within protection domain.Protection scope of the present invention is subject to claims.
Claims (9)
1. a kind of method of incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons, it is characterised in that：Including as follows
Step：
1) it pre-processes：Flying dust is ground, its grain size is made to be less than or equal to 80 μm；
2) it allocates：Sial conditioner is added in flying dust after pretreatment and obtains mixing ash sample, and heat is added into mixing ash sample
Water obtains mixed liquor, calcium, silicon in the mixed liquor and the molar content between aluminium element after 8~10h of agitated excitation
Than the generation requirement for meeting zeolites aluminosilicate mineral tobermorite, and water and the liquid for mixing ash sample are solid in the mixed liquor
Than being 5~10:1mL/g；
3) hydro-thermal reaction：The mixed liquor is added to closed hydrothermal reaction kettle, hydrogen peroxide is pumped into hydrothermal reaction kettle,
Then it is warming up to 150~200 DEG C of hydro-thermal reactions；The hydrogen peroxide is 0.25~1mL/g with the liquid-solid ratio for mixing ash sample；
4) it detaches：The product obtained after hydro-thermal reaction is subjected to dehydration separation, obtains solid product and waste liquid.
2. the method for incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons according to claim 1, special
Sign is：The sial conditioner uses SiO2And Al2O3, calcium, silicon in the mixed liquor and mole containing between aluminium element
Amount meets than molar ratio：
n(CaO)/n(SiO2+AlO1.5)=0.60~1.73,
n(AlO1.5)/n(SiO2+AlO1.5)=0~0.31.
3. the method for incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons according to claim 1, special
Sign is：The hot water is using fresh water or the waste liquid or using the mixing water of fresh water and the waste liquid.
4. the method for incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons according to claim 3, special
Sign is：In the step 2), the temperature of the hot water of addition is 70~90 DEG C, and pH value is 10~12.
5. the method for incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons according to claim 4, special
Sign is：In the step 4), the product that obtains after hydro-thermal reaction is first carried out dehydrating after waste heat recovery again.
6. the method for incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons according to claim 5, special
Sign is：The heat obtained through waste heat recovery is for drying the solid product and/or the heating hot water.
7. the method for incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons according to claim 1, special
Sign is：The time of the hydro-thermal reaction is 12~18 hours.
8. according to the side of claim 1-7 any one of them incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons
Method, it is characterised in that：In the step 2), crystal seed, the quality percentage of crystal seed and flying dust are added in flying dust after pretreatment
Than being 1~3%.
9. the method for incineration of refuse flyash synchronism stability heavy metal and degrading polycyclic aromatic hydrocarbons according to claim 8, special
Sign is：The crystal seed uses artificial tobermorite crystal seed.
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