CN110451701A - The minimizing technology of heavy metal in a kind of flying ash leachate - Google Patents
The minimizing technology of heavy metal in a kind of flying ash leachate Download PDFInfo
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- CN110451701A CN110451701A CN201910691226.3A CN201910691226A CN110451701A CN 110451701 A CN110451701 A CN 110451701A CN 201910691226 A CN201910691226 A CN 201910691226A CN 110451701 A CN110451701 A CN 110451701A
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- Prior art keywords
- flying ash
- ash leachate
- leachate
- heavy metal
- minimizing technology
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention provides a kind of minimizing technology of heavy metal in flying ash leachate, includes the following steps: that the flying ash leachate for filtering out solid lime-ash is obtained by filtration in flying ash leachate by (1), then measure its pH, and measure heavy metal concentration；(2) simulation cement kiln tail gas is passed through in the flying ash leachate that step (1) obtains and is aerated, the pH value of flying ash leachate is down to faintly acid later, stop aeration, by the flying ash leachate after must being aerated after the filtering of flying ash leachate；(3) high-molecular chelating agent is added in the flying ash leachate after Air Exposure, is stirred to react, measure the concentration of heavy metal in flying ash leachate after reaction.Contain a large amount of CO in cement kiln tail gas of the present invention2, flying ash leachate is aerated using cement kiln tail gas, flying ash leachate pH can be not only neutralized and precipitate heavy metal, CO can also be reduced2Discharge, achievees the purpose that the treatment of wastes with processes of wastes against one another.
Description
Technical field
The invention belongs to the environmental technology fields of Solid Waste Treatment technology, and in particular in a kind of flying ash leachate
The minimizing technology of heavy metal.
Background technique
Currently, China's domestic waste is with the development of economy and the raising of living standards of the people and sharp increase.
The phenomenon that ratio of incineration treatment of garbage also rises year by year, and thus caused flying ash yield increases is more and more obvious.And fly
Containing pollutant components such as the big dioxin of the high heavy metal of leaching concentration and toxicity in ash, belong in " National Hazard waste register "
HW18 class hazardous waste, it is necessary to carry out safe disposal.
Flying ash leachate is a kind of having for high concentration that flying ash generates during long-term stacking and landfill
Machine waste water is a kind of secondary pollution that pollution is bigger.Flying ash leachate is in landfill yard since landfill heap body squeezes
The sewage that pressure, rainwater leaching or groundwater erosion generate causes potentially to threaten wherein containing a large amount of polluters to environment.
Not only contain a large amount of organic pollutant in flying ash leachate, but also organic containing a large amount of heavy metal and high concentration
Pollutant.If not carrying out appropriate processing to flying ash leachate to dispose, these polluters will enter natural environment
In to can all various aspects such as polluted-water, soil and atmosphere, and human body can be finally directly entered after food chain, a huge sum of money
Belong in human body can and the strong interaction of the generations such as protein and enzyme, so that them is lost activity, it is also possible in certain of human body
It is accumulated in a little organs, causes slow poisoning.
Common hazardous waste leach liquid processing method include: biochemical treatment, chemical oxidation treatment, recharge processing, at film
Reason and evaporation and concentration processing.Often containing from plating, pesticide, petrochemical industry and fining in the hazardous waste of dangerous waste landfill yard landfill
All kinds of organic and inorganic pollution of the industries such as work, such as: ammonia nitrogen, heavy metal ion, high poison organic matter, salinity and cyanide.
Therefore leachate biodegradability is very poor, it is difficult to be handled using biochemical and recharge method；Chemical oxidization method processing needs to disappear
A large amount of chemical reagent is consumed, if hydrogen peroxide common in Fenton process is expensive, processing cost is high；Membrane processing method is to life rubbish
Rubbish leachate treatment effect is good, but hazardous waste leachates more to heavy metal ion, more complicated can not be applicable in；It is conventional
Often contain ammonia nitrogen in the condensate liquid that evaporation concentration method obtains, after needing to be further processed could qualified discharge, this undoubtedly it is big greatly
Cost of disposal is weighed.
Summary of the invention
The present invention is directed to defect of the currently available technology to the heavy metal poor processing effect in flying ash leachate, mesh
Be the processing method for being to provide a kind of flying ash leachate low in cost, effect is good, this method is using simulation cement
Kiln exhaust gas is aerated flying ash leachate, carries out in carbonating control flying ash leachate to flying ash leachate
The leaching of heavy metal, then carries out the chelatropic reaction of heavy metal again, and removal effect is very excellent.
To solve the above-mentioned problems, the technical scheme adopted by the invention is as follows:
The minimizing technology of heavy metal, includes the following steps: in a kind of flying ash leachate
(1) flying ash leachate is obtained by filtration to the flying ash leachate for filtering out solid lime-ash in filter device, so
After measure its pH, and measure heavy metal concentration；
(2) simulation cement kiln tail gas is passed through in the flying ash leachate that step (1) obtains and is aerated, will burnt later
The pH value for burning flying dust leachate is down to faintly acid, stops aeration, and flying ash leachate must be aerated after filter device filtering
Flying ash leachate afterwards；
(3) high-molecular chelating agent is added in the flying ash leachate after Air Exposure, is stirred to react one timing of processing
Between, the concentration of heavy metal in flying ash leachate is measured after reaction.
Preferably, in step (1), the pH of flying ash leachate is 12 or more.
Preferably, in step (2), aeration temperature is 25-80 DEG C.
Preferably, the aeration system are as follows: press 0.1-0.3m3The throughput of/s blasts gas into leachate, continues
2-4 hours.
Preferably, the high-molecular chelating agent the preparation method comprises the following steps:
50~100g of divinyl benzene crosslinked sulphonated polystyrene is added in reaction vessel, 1.5~3.0g is added and urges
Agent adds the L-PROLINE of 3.0~8.0g；After being stirred to react 0.5~2h at 40~60 DEG C, 80~300mL is added
Amination modifying agent, be then slowly added into reaction vessel 20~50mL concentration be 0.5~1mol/L alkaline solution then with
The revolving speed of 200~400r/min stirs, and is condensed back, and reacts 8 at 60~120 DEG C~for 24 hours, after reaction, successively with water,
Ethanol washing, filtering is dry at 100-110 DEG C, obtains the high-molecular chelating agent.
Preferably, the catalyst is one of copper chloride, copper bromide, copper oxide or copper acetate or a variety of.
Preferably, the amination modifying agent is one of diethylenetriamine, ethylenediamine, ethanol amine, aniline or a variety of.
Preferably, the alkaline solution is NaOH, Na2CO3Or KOH.
Preferably, in step (3), the additional amount of chelating agent and the mass volume ratio of flying ash leachate are 10-30g/
1L。
Preferably, in step (3), the time being stirred to react is 30-60min.
Compared with prior art, the present invention have it is below obvious the utility model has the advantages that
(1) present invention, which utilizes, contains a large amount of CO in cement kiln tail gas2As sour gas to flying ash leachate into
Row accelerates carbonating, and the heavy metal in flying ash leachate can be made to be changed into carbonate combine state, make the leaching of heavy metal
Rate reduces, meanwhile, chelating agent is added after carbonating and is handled the heavy metal that can will mainly fail carbonating by the present invention
It is filtered out after forming stable metallo-chelate after being complexed, two step combination processings, which can substantially be fully achieved removal and burn, to fly
The purpose of heavy metal in grey leachate；
(2) contain a large amount of CO in cement kiln tail gas of the present invention2, flying ash leachate is carried out using cement kiln tail gas
Aeration, can not only neutralize flying ash leachate pH and precipitate heavy metal, can also reduce CO2Discharge, reach with
It is useless to control useless purpose.
Specific embodiment
In order to which objects and advantages of the present invention are more clearly understood, the present invention is carried out specifically with reference to embodiments
It is bright.It should be appreciated that following text is only used to describe one or more of specific embodiments of the invention, not to the present invention
The protection scope specifically requested carries out considered critical.
Embodiment 1
The minimizing technology of heavy metal, includes the following steps: in a kind of flying ash leachate
(1) flying ash leachate is obtained by filtration to the flying ash leachate for filtering out solid lime-ash in filter device, so
After to measure its pH be 12.4, and measure heavy metal concentration；
(2) simulation cement kiln tail gas is passed through in the flying ash leachate that step (1) obtains and is aerated, be aerated temperature
It is 40 DEG C, by 0.2m3The throughput of/s blasts gas into leachate, continues 3 hours, later by the pH of flying ash leachate
Value is down to faintly acid, stops aeration, and the flying ash after flying ash leachate must be aerated after filter device filtering leaches
Liquid；
(3) 100g high-molecular chelating agent is added into the flying ash leachate after the Air Exposure of 5L, is stirred to react place
45min is managed, measures the concentration of heavy metal in flying ash leachate after reaction.
Embodiment 2
The minimizing technology of heavy metal, includes the following steps: in a kind of flying ash leachate
(1) flying ash leachate is obtained by filtration to the flying ash leachate for filtering out solid lime-ash in filter device, so
After to measure its pH be 12.1, and measure heavy metal concentration；
(2) simulation cement kiln tail gas is passed through in the flying ash leachate that step (1) obtains and is aerated, be aerated temperature
It is 35 DEG C, by 0.2m3The throughput of/s blasts gas into leachate, continues 3 hours, later by the pH of flying ash leachate
Value is down to faintly acid, stops aeration, and the flying ash after flying ash leachate must be aerated after filter device filtering leaches
Liquid；
(3) 80g high-molecular chelating agent is added into the flying ash leachate after the Air Exposure of 5L, is stirred to react processing
60min measures the concentration of heavy metal in flying ash leachate after reaction.
Embodiment 3
The minimizing technology of heavy metal, includes the following steps: in a kind of flying ash leachate
(1) flying ash leachate is obtained by filtration to the flying ash leachate for filtering out solid lime-ash in filter device, so
After to measure its pH be 12.2, and measure heavy metal concentration；
(2) simulation cement kiln tail gas is passed through in the flying ash leachate that step (1) obtains and is aerated, be aerated temperature
It is 45 DEG C, by 0.2m3The throughput of/s blasts gas into leachate, continues 3 hours, later by the pH of flying ash leachate
Value is down to faintly acid, stops aeration, and the flying ash after flying ash leachate must be aerated after filter device filtering leaches
Liquid；
(3) 90g high-molecular chelating agent is added into the flying ash leachate after the Air Exposure of 4L, is stirred to react processing
40min measures the concentration of heavy metal in flying ash leachate after reaction.
Embodiment 4
The minimizing technology of heavy metal, includes the following steps: in a kind of flying ash leachate
(1) flying ash leachate is obtained by filtration to the flying ash leachate for filtering out solid lime-ash in filter device, so
After to measure its pH be 12.4, and measure heavy metal concentration；
(2) simulation cement kiln tail gas is passed through in the flying ash leachate that step (1) obtains and is aerated, be aerated temperature
It is 30 DEG C, by 0.2m3The throughput of/s blasts gas into leachate, continues 3 hours, later by the pH of flying ash leachate
Value is down to faintly acid, stops aeration, and the flying ash after flying ash leachate must be aerated after filter device filtering leaches
Liquid；
(3) 70g high-molecular chelating agent is added into the flying ash leachate after the Air Exposure of 3L, is stirred to react processing
45min measures the concentration of heavy metal in flying ash leachate after reaction.
Embodiment 5
The minimizing technology of heavy metal, includes the following steps: in a kind of flying ash leachate
(1) flying ash leachate is obtained by filtration to the flying ash leachate for filtering out solid lime-ash in filter device, so
After to measure its pH be 12.5, and measure heavy metal concentration；
(2) simulation cement kiln tail gas is passed through in the flying ash leachate that step (1) obtains and is aerated, be aerated temperature
It is 60 DEG C, by 0.2m3The throughput of/s blasts gas into leachate, continues 3 hours, later by the pH of flying ash leachate
Value is down to faintly acid, stops aeration, and the flying ash after flying ash leachate must be aerated after filter device filtering leaches
Liquid；
(3) 130g high-molecular chelating agent is added into the flying ash leachate after the Air Exposure of 6L, is stirred to react place
45min is managed, measures the concentration of heavy metal in flying ash leachate after reaction.
Embodiment 6
High-molecular chelating agent described in embodiment 1-5 the preparation method comprises the following steps:
Divinyl benzene crosslinked sulphonated polystyrene 80g is added in reaction vessel, 2.0g catalyst copper chloride is added,
Add the L-PROLINE of 5.0g；After being stirred to react 0.5~2h at 50 DEG C, 80~300mL amination modifying agent diethyl is added
Alkene triamine, it is the KOH alkaline solution of 0.7mol/L then with 300r/min that 40mL concentration is then slowly added into reaction vessel
Revolving speed stirring, be condensed back, 12h is reacted at 90 DEG C, after reaction, successively use water, ethanol washing, filtering, at 100 DEG C
Lower drying, obtains the high-molecular chelating agent.
Comparative example 1
The minimizing technology of heavy metal, includes the following steps: in a kind of flying ash leachate
(1) flying ash leachate is obtained by filtration to the flying ash leachate for filtering out solid lime-ash in filter device, so
After to measure its pH be 12.4, and measure heavy metal concentration；
(2) simulation cement kiln tail gas is passed through in the flying ash leachate that step (1) obtains and is aerated, be aerated temperature
It is 40 DEG C, by 0.2m3The throughput of/s blasts gas into leachate, continues 3 hours, later by the pH of flying ash leachate
Value is down to faintly acid, stops aeration, and the flying ash after flying ash leachate must be aerated after filter device filtering leaches
Liquid then measures the concentration of heavy metal in flying ash leachate.
To the concentration of heavy metal ion in the flying ash leachate of embodiment 1-5 and comparative example 1 before and after treatment
It is measured, and calculates its removal rate.
By measure and calculation, the removal rate of embodiment 1-5 and comparative example 1 is as follows:
As can be seen from the above table, present invention process is to Cu ion, Pb ion and the Zn ion in flying ash leachate
There is preferable adsorption effect, and is superior to the adsorbent material of comparative example 1.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. the minimizing technology of heavy metal in a kind of flying ash leachate, which comprises the steps of:
(1) flying ash leachate is obtained by filtration to the flying ash leachate for filtering out solid lime-ash in filter device, is then surveyed
Its fixed pH, and measure heavy metal concentration；
(2) simulation cement kiln tail gas is passed through in the flying ash leachate that step (1) obtains and is aerated, will burned fly later
The pH value of grey leachate is down to faintly acid, stops aeration, after flying ash leachate must be aerated after filter device filtering
Flying ash leachate；
(3) high-molecular chelating agent is added in the flying ash leachate after Air Exposure, is stirred to react processing certain time, instead
The concentration of heavy metal in flying ash leachate is measured after answering.
2. the minimizing technology of heavy metal in flying ash leachate according to claim 1, which is characterized in that step (1)
In, the pH of flying ash leachate is 12 or more.
3. the minimizing technology of heavy metal in flying ash leachate according to claim 1, which is characterized in that step (2)
In, aeration temperature is 25-80 DEG C.
4. the minimizing technology of heavy metal in flying ash leachate according to claim 1, which is characterized in that the exposure
Gas technique are as follows: press 0.1-0.3m3The throughput of/s blasts gas into leachate, continues 2-4 hours.
5. the minimizing technology of heavy metal in flying ash leachate according to claim 1, which is characterized in that the high score
Sub- chelating agent the preparation method comprises the following steps:
50~100g of divinyl benzene crosslinked sulphonated polystyrene is added in reaction vessel, 1.5~3.0g catalyst is added,
Add the L-PROLINE of 3.0~8.0g；After being stirred to react 0.5~2h at 40~60 DEG C, adds 80~300mL amination and change
Property agent, be then slowly added into reaction vessel alkaline solution that 20~50mL concentration is 0.5~1mol/L then with 200~
The revolving speed of 400r/min stirs, and is condensed back, react 8 at 60~120 DEG C~for 24 hours, after reaction, successively use water, ethyl alcohol
Washing, filtering is dry at 100-110 DEG C, obtains the high-molecular chelating agent.
6. minimizing technology according to claim 5, which is characterized in that the catalyst is copper chloride, copper bromide, copper oxide
Or one of copper acetate or a variety of.
7. minimizing technology according to claim 5, which is characterized in that the amination modifying agent is diethylenetriamine, second two
One of amine, ethanol amine, aniline are a variety of.
8. minimizing technology according to claim 5, which is characterized in that the alkaline solution is NaOH, Na2CO3Or KOH.
9. minimizing technology according to claim 1-8, which is characterized in that in step (3), the additional amount of chelating agent
Mass volume ratio with flying ash leachate is 10-30g/1L.
10. -9 described in any item minimizing technologies according to claim 1, which is characterized in that in step (3), be stirred to react when
Between be 30-60min.
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| CN110950361A (en) * | 2019-12-13 | 2020-04-03 | 江门市新财富环境科技有限公司 | Hazardous waste fly ash treatment process |
| CN114315100A (en) * | 2022-01-07 | 2022-04-12 | 李增俊 | Fly ash treatment process |
| CN115213207A (en) * | 2022-07-07 | 2022-10-21 | 中泰莱(江苏)环境有限公司 | Utilization method for harmless treatment of fly ash |
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| CN114315100A (en) * | 2022-01-07 | 2022-04-12 | 李增俊 | Fly ash treatment process |
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| CN115213207A (en) * | 2022-07-07 | 2022-10-21 | 中泰莱(江苏)环境有限公司 | Utilization method for harmless treatment of fly ash |
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Application publication date: 20191115 |