CN102583823A - Method for co-treatment of waste incineration fly ash and waste percolate - Google Patents
Method for co-treatment of waste incineration fly ash and waste percolate Download PDFInfo
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- CN102583823A CN102583823A CN2012100319056A CN201210031905A CN102583823A CN 102583823 A CN102583823 A CN 102583823A CN 2012100319056 A CN2012100319056 A CN 2012100319056A CN 201210031905 A CN201210031905 A CN 201210031905A CN 102583823 A CN102583823 A CN 102583823A
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Abstract
The invention discloses a method for co-treatment of waste incineration fly ash and waste percolate, which comprises sequentially injecting the incineration fly ash, the waste percolate and air/oxygen into a high-temperature high-pressure reaction kettle to perform harmless treatment, determining liquid/solid ratio between the waste percolate and the waste incineration fly ash according to actual conditions of a waste incineration plant, enabling the reaction temperature to be 150 DEG C to 250 DEG C, and enabling the concentration of the injected oxygen to be 1.2 times that of original chemical oxygen demand (COD) of the waste percolate. By treatment of the method, organic pollutants in the waste incineration fly ash such as dioxin are substantially degraded, the leaching toxicity of heavy metal after stabilization fully reaches the standard, and simultaneously indexes of COD, ammonia nitrogen, suspended particles, total organic carbon and the like in the waste percolate are remarkably reduced. The method for co-treatment of the waste incineration fly ash and the waste percolate has the advantages of being high in treatment efficiency, low in treatment cost and wide in applied range, avoiding generating poisonous by-products and the like, and has good applied prospect.
Description
Technical field
The invention belongs to the technical field of the innoxious and recycling of solid waste and high concentrated organic waste liquid, relate in particular to the harmless disposal method of a kind of cooperative disposal city garbage burning flying ash and percolate.
Background technology
Along with the size of population continues to increase, urbanization process is accelerated and growth in the living standard.In recent years, municipal wastes quantity rapidly increases.China's daily-life garbage without environmental pollution is disposed mainly by three kinds of modes: landfill, burning and compost.China's domestic rubbish disposal mainly is to be main with landfill, burn with the ratio of compost less, but ratio every year of burning is all in growth.Burning is compared landfill and is had and subtract appearance, decrement etc., and the energy such as utilizes once more at advantage.If it is main continuing with landfill, in the near future, more cities will be surrounded by rubbish, and this just forces China to accelerate the construction of garbage burning factory.
The rubbish of burning city domestic garbage factory will carry out a certain amount of stacking storage and drying process before burning, therefore can produce a certain amount of percolate.Percolate is a kind of high concentrated organic wastewater of complicated component, is acknowledged as one of sewage up to standard the most hard to manage in the world today.The typical feature of percolate is BOD and COD concentration height, heavy metal concentration is high, water quality and quantity changes greatly, ammonia nitrogen content is high, microbial nutrition is out of proportion, and not only very stench is unpleasant, and index of correlation is 10-100 times of general municipal effluent.Consumer waste infiltration liquid directly discharges in the environment, and surrounding soil and water body are caused severe contamination, the percolate place of arrival, and plant can't grow.
In exhaust gas purification equipment, understand the flying dust of sedimentation high-content dioxin and heavy metal simultaneously in the burning city domestic garbage process.According in " consumer waste filling and embedding pollute control criterion GB16889-2008 " clearly the regulation domestic garbage incineration flyash belong to danger wastes; Simultaneously landfill require for domestic garbage incineration flyash water ratio efficient less than 30%, the leaching toxicity that dioxin content is lower than 3 ug TEQ/Kg and heavy metal is lower than corresponding standard value.Particularly ， dioxin (PCDD/Fs) is the general designation of many chloros dibenzodioxin English (PCDDs) and many chloros diphenylene-oxide (PCDFs).Be known as " the most malicious in the world material ", maximum harm is to have irreversible " three cause " toxicity, i.e. teratogenesis, carcinogenic, mutagenesis; In case get in vivo, pile up and almost can not discharge or degrade at organism lipid layer and internal organs, produce the poisoning of accumulation property, have a strong impact on ecotope on every side.
At present both at home and abroad percolate and incineration of refuse flyash are obtained numerous researchists' concern, and carried out great deal of experimental, and obtained many achievements, also the part method has through engineering approaches to use.But present treatment process obviously also exists some defectives, mainly shows several aspects:
(1) synergetic property is poor
The percolate of incineration plant and incineration of refuse flyash treatment project all are independent completion, both method of disposal wide of the marks.
(2) processing cost is high
The standard technology that the percolate standard method is handled is anaerobism+aerobic+membrane treatment process, and this technology front-end investment cost is high, and floor space is big, and processing cost is expensive.The main method of incineration of refuse flyash through landfill after solidifying, floor space is big, and cost of disposal is more expensive.
(3) treatment effect is low
In the refuse treatment liquid treatment process of standard, aerobic step can be gone out organic pollutant and nitrification preferably, but in denitrification, is difficult to control, and later stage film treatment effect can be to guarantee simultaneously.The incineration of refuse flyash solidification effect is poor, and the heavy metal in the flying dust is not with dioxin has substantive the solution, to landfill yard surrounding environment potential risk.In the landfill disposal of long period, the heavy metal in the flying dust He dioxin again diafiltration in environment, cause for the second time and pollute.
Therefore, developing the treating refuse flying ash with autonomous property right and the cooperative disposal method of percolate, is to advance domestic waste harmlessness disposing, recycling; Conscientiously problem is significant to solve that incineration of refuse flyash is poor with the synergetic property of percolate processing, cost height, poor practicability, effect are low etc.
Summary of the invention
The objective of the invention is to overcome at present problem such as do not have synergetic property in the domestic and international ubiquitous harmless treatment percolate and incineration of refuse flyash process, processing cost height, poor practicability, effect are low; The method of a kind of associated treatment incineration of refuse flyash and percolate is provided, and this method has characteristics such as technology is simple, processing cost is low, treatment effect is good, wide adaptability.
The objective of the invention is to realize through following technical scheme: the method for a kind of associated treatment incineration of refuse flyash and percolate, this method comprises following step:
(1) flying ash after the flue gas purifying equipment dedusting of garbage burning factory is delivered to high-temperature high-pressure reaction kettle through the pressure transferpump;
(2) use heat exchanger to make full use of the steam waste heat of garbage burning factory tail gas and the heat of processing back waste liquid, with importing high-temperature high-pressure reaction kettle by pressure pump after the percolate preheating;
(3) add percolate and incineration of refuse flyash according to a certain percentage behind high-temperature high-pressure reaction kettle, the sealing high-temperature high-pressure reaction kettle; And utilize the steam waste heat heating high-temperature high-pressure reaction kettle of garbage burning factory and keep temperature of reaction, through whisking appliance percolate and incineration of refuse flyash are stirred simultaneously;
(4) after high-temperature high-pressure reaction kettle is heated to temperature of reaction; Open the gas inlet valve of high-temperature high-pressure reaction kettle; With in air (or purity oxygen) injecting reactor, in high-temperature high-pressure reaction kettle, incineration of refuse flyash and percolate are carried out harmless treatment through compressor;
(5) soup compound through reaction back will be handled the back ash through solid-liquid separator and separate with debris, handle the directly discharge of back ash, and debris is discharged after transferring subsequent disposal such as PH, removal suspended particulate and removal heavy metal.
Further, in the said step (3), the actual output solid-liquid of incineration of refuse flyash and percolate is than being 1:3-6 (g/ml).
Further, in the said step (4), according to 1.2 times of oxygen requirement bubbling airs of the original COD value of percolate or purity oxygen as oxygenant.
Further, said temperature of reaction is 150 ℃-250 ℃, and the reaction times is 0.5-2 hour.
Further, said percolate can be the percolate of garbage burning factory percolate or landfill factory, and incineration of refuse flyash can be garbage burning factory flying dust or flyash.
The invention has the beneficial effects as follows:
(1) efficient is high: with respect to other treatment processs, the inventive method has associated treatment percolate and garbage flying ash.Moreover aerating oxygen accelerates speed of reaction, and the composition in the flying dust helps catalyze and degrade organic pollutants, makes harmless treatment efficient higher.
(2) environmental friendliness: with respect to other treatment processs, the inventive method is that pollutent is finally innoxious, does not produce corresponding deleterious by product.
(3) cost is low: with respect to additive method, this method need not spend a large amount of man power and materials, and need not buy expensive equipment treating refuse percolate and garbage flying ash respectively, reduces the cost of collecting device; Utilize the waste heat of incineration plant to carry out preheating simultaneously, thus energy-conservation.
Description of drawings
Fig. 1 is the schema of associated treatment incineration of refuse flyash and percolate method.
Embodiment
The principle of the method for associated treatment treating refuse flying ash of the present invention and percolate mainly is that the dielectric constant of water heating back water obviously reduces, and impels the water capacity to be prone to organic pollutant and O such as Rong Xie dioxin
2Molecule.The ionic product of the water after the heating obviously increases simultaneously, helps the reactive behavior of water.Feed O in the method
2Impel to form the very strong radical of oxidation capacity, speed of response is fast, and oxidation efficiency is high, can make organic chemical bond rupture and finally be oxidized to CO
2And H
2O, the principle that forms radical is following:
； （2）
Organic degraded in the absorption coagulation interaction catalysis flying dust Zhong dioxin of metals ion and flying dust and the percolate in the flying dust; Change ionic forms after the thermal response of fly-ash heavy metal ion water inlet simultaneously and become oxidation state and silico-aluminate form, fly-ash heavy metal is played static stabilization.
As shown in Figure 1, the method for associated treatment incineration of refuse flyash of the present invention and percolate comprises following step:
(1) flying ash after the flue gas purifying equipment dedusting of garbage burning factory is delivered to high-temperature high-pressure reaction kettle through the pressure transferpump;
(2) use heat exchanger to make full use of the steam waste heat of garbage burning factory tail gas and the heat of processing back waste liquid, with importing high-temperature high-pressure reaction kettle by pressure pump after the percolate preheating;
(3) add percolate and incineration of refuse flyash according to a certain percentage behind high-temperature high-pressure reaction kettle, the sealing high-temperature high-pressure reaction kettle; And utilize the steam waste heat heating high-temperature high-pressure reaction kettle of garbage burning factory and keep temperature of reaction, through whisking appliance percolate and incineration of refuse flyash are stirred simultaneously;
(4) after high-temperature high-pressure reaction kettle is heated to temperature of reaction; Open the gas inlet valve of high-temperature high-pressure reaction kettle; With in air (or purity oxygen) injecting reactor, in high-temperature high-pressure reaction kettle, incineration of refuse flyash and percolate are carried out harmless treatment through compressor;
(5) soup compound after reaction; To handle the back ash through solid-liquid separator separates with debris; Meet national corresponding standard fully after solid phase is handled, and debris should be transferred PH, removes suspended particulate and removed subsequent disposal such as heavy metal, discharge after reaching national wastewater discharge standard.
This method comprises following reaction conditions:
1, is 1:3-6 (g/ml) according to the incineration of refuse flyash of actual China garbage burning factory and the actual output solid-liquid ratio of percolate, need do not add other chemical reagent simultaneously;
2, according to 1.2 times of oxygen requirement bubbling airs of the original COD value of percolate or purity oxygen as oxygenant;
3, temperature of reaction is 150 ℃-250 ℃, and the corresponding reaction times is 0.5-2 hour, and temperature of reaction is high more, and the reaction times is short more;
4, reaction process continues turn on agitator, and rotating speed is 150-250 rev/min;
5, reaction pressure adds the dividing potential drop of input air/oxygen for the water saturation vapor pressure.
6, percolate can be the percolate of garbage burning factory percolate or landfill factory, and incineration of refuse flyash is garbage burning factory flying dust or flyash.
Among the present invention, high-temperature high-pressure reaction kettle uses alkaline-resisting corrosion resistant material to process, and is known products.
Among the present invention, use the catalyzed degradation of incineration of refuse flyash to the garbage filter liquid pollution-free, aluminum oxide, uncompleted burned carbon, silica gel are support of the catalyst in the flying dust, and transiting state metal ion or oxide compound are catalyzer in the flying dust.
Method of the present invention has static stabilization to heavy metal.
Through embodiment the present invention is described further below, it is more obvious that the object of the invention and effect will become.
Garbage burning factory with certain Hangzhou 800t/d is an example, and the garbage filter that produced in a day is about 20%, and the output of flying ash is 3-7%.Be that to produce percolate every day be 160 tons, incineration of refuse flyash is the 24-56 ton.Therefore Gu adopt liquid/in the instance than being equipped with explanation for 5:1.The initial COD of percolate is 50000 (mg/L), NH
3Be 1600mg/L.The concentration 3.5 ng I-TEQ/g of garbage flying ash Zhong dioxin surpass national standard of landfill 3.0 ng I-TEQ/g, and the leaching toxicity of heavy metal Pb, Cr surpasses the national security standard of landfill in the original flying dust.
Before handling with handle after COD respectively with COD
0And COD
1Represent, calculate the removal efficient of COD according to formula:
X
COD =(（[COD]
0- [COD]
1）/ [COD]
0)*100 % ；
Corresponding N H
3With the clearance of Dioxins be:
X
NH3Clearance=(([NH
3]
0-[NH
3]
1)/[NH
3]
0) * 100 %;
X
DioxinsClearance=(([Dioxins]
0-[Dioxins]
1)/[Dioxins]
0) * 100%.
Embodiment 1:
Incineration of refuse flyash and percolate are added high-temperature high-pressure reaction kettle, solid wherein liquid/than being 5:1 (g/mL), open stirring its, its stirring velocity is 200 rev/mins.Reaction kettle is heated to 250 ℃ of temperature of reaction, in reaction kettle, feeds purity oxygen again, the feeding amount of its oxygen is 1.2 times of COD in the percolate, and the reaction times is 2 hours.After solid-liquid separator carries out solid-liquid separation, handling back flying dust Zhong dioxin degradation efficiency is 99.9% through reaction treatment, and the leaching toxicity of all heavy metals is up to state standards; The degradation efficiency of the COD of percolate is 97%, and the NH3 degradation efficiency is 85%.
In order to prove aerating oxygen in HTHP degraded incineration of refuse flyash and percolate, can improve speed of reaction greatly and shorten the reaction times, therefore carried out simultaneous test in the identical operating mode that does not have aerating oxygen.Under identical working condition, Gu the i.e. liquid of percolate and incineration of refuse flyash/than being 5:1 (g/mL), opening and stir it, its stirring velocity is 200 rev/mins.Be heated to 250 ℃ of temperature of reaction, but aerating oxygen in reaction kettle not, and the reaction times reaches 18 hours.The degradation efficiency of reaction Hou dioxin only reaches 93%, and the leaching toxicity of all heavy metals is up to state standards; But do not have under the aerating oxygen situation, the degradation efficiency of reaction times 18 hours flying dust Zhong dioxin only reaches 93%, the COD of percolate and NH
3Almost do not reduce, diafiltration debris COD is 48000 (mg/L), NH
3Be 1400 mg/L.
Explain in the reaction kettle add oxygen after, the reaction times obviously shortens, reaction efficiency obviously improves.
Embodiment 2:
The 500ml percolate adds high-temperature high-pressure reaction kettle, and sealed reactor is opened whisking appliance, and stirring velocity is 200 rev/mins, and Heating temperature to 200 ℃ feeds 1.2 times of COD of percolate, and the reaction times is 2 hours.The degradation efficiency of the COD of percolate is 80%, and the NH3 degradation efficiency is 65%.
Under the identical oxygen level condition of same reaction temperature, reaction times and feeding; Add incineration of refuse flyash at percolate; Be about to incineration of refuse flyash and percolate and add high-temperature high-pressure reaction kettle; Gu liquid/than being 5:1 (g/mL), open whisking appliance wherein, stirring velocity is 200 rev/mins.Be heated to 200 ℃ of temperature of reaction, 1.2 times of the COD that feeds percolate,, the reaction times is 2 hours.Reaction back flying dust Zhong dioxin degradation efficiency is 99.9%, and the leaching toxicity of all heavy metals is up to state standards; The degradation efficiency of the COD of percolate is 94%, and the NH3 degradation efficiency is 78%.
Explain: after adding incineration of refuse flyash, obviously improve the degradation efficiency of percolate, garbage flying ash also carries out harmless treatment simultaneously.Comparative example 1 can find out with enforcement 2; When temperature of reaction is 200 ℃; Feed the oxygen organism such as Dioxins, COD, NH3 of just can effectively degrading; Stabilization heavy metal has simultaneously so not only reduced temperature of reaction, has reduced performance requriements, raising security to reaction kettle, has raised the efficiency simultaneously, the harmless processing of save energy and flying dust.
Claims (5)
1. the method for associated treatment incineration of refuse flyash and percolate is characterized in that this method comprises following step:
(1) flying ash after the flue gas purifying equipment dedusting of garbage burning factory is delivered to high-temperature high-pressure reaction kettle through the pressure transferpump;
(2) use heat exchanger to make full use of the steam waste heat of garbage burning factory tail gas and the heat of processing back waste liquid, with importing high-temperature high-pressure reaction kettle by pressure pump after the percolate preheating;
(3) add percolate and incineration of refuse flyash according to a certain percentage behind high-temperature high-pressure reaction kettle, the sealing high-temperature high-pressure reaction kettle; And utilize the steam waste heat heating high-temperature high-pressure reaction kettle of garbage burning factory and keep temperature of reaction, through whisking appliance percolate and incineration of refuse flyash are stirred simultaneously;
(4) after high-temperature high-pressure reaction kettle is heated to temperature of reaction; Open the gas inlet valve of high-temperature high-pressure reaction kettle; With in air (or purity oxygen) injecting reactor, in high-temperature high-pressure reaction kettle, incineration of refuse flyash and percolate are carried out harmless treatment through compressor;
(5) soup compound through reaction back will be handled the back ash through solid-liquid separator and separate with debris, handle the directly discharge of back ash, and debris is discharged after transferring subsequent disposal such as PH, removal suspended particulate and removal heavy metal.
2. according to the method for said associated treatment incineration of refuse flyash of claim 1 and percolate, it is characterized in that in the said step (3), the actual output solid-liquid of incineration of refuse flyash and percolate is than being 1:3-6 (g/ml).
3. according to the method for said associated treatment incineration of refuse flyash of claim 1 and percolate, it is characterized in that, in the said step (4), according to 1.2 times of oxygen requirement bubbling airs of the original COD value of percolate or purity oxygen as oxygenant.
4. according to the method for said associated treatment incineration of refuse flyash of claim 1 and percolate, it is characterized in that said temperature of reaction is 150 ℃-250 ℃, the reaction times is 0.5-2 hour.
5. according to the method for said associated treatment incineration of refuse flyash of claim 1 and percolate; It is characterized in that; Said percolate can be the percolate of garbage burning factory percolate or landfill factory, and incineration of refuse flyash can be garbage burning factory flying dust or flyash.
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Cited By (11)
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| CN102962240A (en) * | 2012-11-23 | 2013-03-13 | 东华大学 | Method for stabilizing treatment of waste incineration fly ash by utilizing silicon powder hydrothermal curing |
| CN103264044A (en) * | 2013-06-05 | 2013-08-28 | 中国科学院广州能源研究所 | Method for cooperatively removing heavy metal and dioxin out of burnt waste fly ash |
| CN104787956A (en) * | 2015-05-05 | 2015-07-22 | 中国电建集团中南勘测设计研究院有限公司 | Treatment method of landfill leachate and device of treatment method |
| CN105290077A (en) * | 2014-06-16 | 2016-02-03 | 北京精诚博桑科技有限公司 | Method for coprocessing fly ash and landfill leachate |
| CN105570907A (en) * | 2016-01-19 | 2016-05-11 | 东华大学 | Volatilizing gasification and incineration disposal method and device for high-concentration organic waste liquid |
| CN108980853A (en) * | 2018-09-12 | 2018-12-11 | 中国环境科学研究院 | Incineration of refuse flyash and percolate cooperative processing method and device |
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| CN109647850A (en) * | 2018-12-06 | 2019-04-19 | 上海金山环境再生能源有限公司 | The processing system of collaboration processing incineration of refuse flyash and garbage leachate |
| CN111875151A (en) * | 2020-05-25 | 2020-11-03 | 东南大学 | System and method for co-processing garbage leachate and incineration fly ash |
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| CN101502838A (en) * | 2009-03-05 | 2009-08-12 | 中国科学院生态环境研究中心 | Novel technique for harmless treatment of medical refuse burning flyash |
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| CN102962240A (en) * | 2012-11-23 | 2013-03-13 | 东华大学 | Method for stabilizing treatment of waste incineration fly ash by utilizing silicon powder hydrothermal curing |
| CN103264044A (en) * | 2013-06-05 | 2013-08-28 | 中国科学院广州能源研究所 | Method for cooperatively removing heavy metal and dioxin out of burnt waste fly ash |
| CN103264044B (en) * | 2013-06-05 | 2015-09-23 | 中国科学院广州能源研究所 | A kind of method of heavy metal and dioxin in collaborative removal refuse incinerating flyash |
| CN105290077A (en) * | 2014-06-16 | 2016-02-03 | 北京精诚博桑科技有限公司 | Method for coprocessing fly ash and landfill leachate |
| CN104787956A (en) * | 2015-05-05 | 2015-07-22 | 中国电建集团中南勘测设计研究院有限公司 | Treatment method of landfill leachate and device of treatment method |
| CN105570907B (en) * | 2016-01-19 | 2018-05-15 | 东华大学 | A kind of high concentrated organic waste liquid volatilization gasification burning disposal method of disposal and its device |
| CN105570907A (en) * | 2016-01-19 | 2016-05-11 | 东华大学 | Volatilizing gasification and incineration disposal method and device for high-concentration organic waste liquid |
| WO2018233613A1 (en) * | 2017-06-20 | 2018-12-27 | 青岛理工大学 | Method for processing waste incineration fly ash by using biogas residues |
| CN108980853A (en) * | 2018-09-12 | 2018-12-11 | 中国环境科学研究院 | Incineration of refuse flyash and percolate cooperative processing method and device |
| CN109647850A (en) * | 2018-12-06 | 2019-04-19 | 上海金山环境再生能源有限公司 | The processing system of collaboration processing incineration of refuse flyash and garbage leachate |
| CN111875151A (en) * | 2020-05-25 | 2020-11-03 | 东南大学 | System and method for co-processing garbage leachate and incineration fly ash |
| CN113634577A (en) * | 2021-06-11 | 2021-11-12 | 深圳市长隆科技有限公司 | Medicament for acid catalysis of heavy metals in long-period stable fly ash and use method thereof |
| CN113800681A (en) * | 2021-09-30 | 2021-12-17 | 华中科技大学 | Method for removing heavy metal ions in domestic garbage incineration fly ash eluent |
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