SG179361A1 - Method for removing harmful substances in waste incinerator fly ash - Google Patents
Method for removing harmful substances in waste incinerator fly ash Download PDFInfo
- Publication number
- SG179361A1 SG179361A1 SG2011064177A SG2011064177A SG179361A1 SG 179361 A1 SG179361 A1 SG 179361A1 SG 2011064177 A SG2011064177 A SG 2011064177A SG 2011064177 A SG2011064177 A SG 2011064177A SG 179361 A1 SG179361 A1 SG 179361A1
- Authority
- SG
- Singapore
- Prior art keywords
- fly ash
- waste
- pulverized
- fresh water
- solid
- Prior art date
Links
- 239000010881 fly ash Substances 0.000 title claims abstract description 98
- 239000000126 substance Substances 0.000 title claims abstract description 27
- 239000002699 waste material Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 20
- 238000000605 extraction Methods 0.000 claims abstract description 18
- 239000013505 freshwater Substances 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 238000004090 dissolution Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000007654 immersion Methods 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 239000010808 liquid waste Substances 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 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 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000007711 solidification Methods 0.000 claims description 7
- 230000008023 solidification Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000010298 pulverizing process Methods 0.000 claims description 5
- 238000004056 waste incineration Methods 0.000 claims description 5
- 238000003915 air pollution Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000008399 tap water Substances 0.000 claims description 2
- 235000020679 tap water Nutrition 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 13
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 11
- 239000002956 ash Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000002013 dioxins Chemical class 0.000 description 2
- 238000009775 high-speed stirring Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
OF THE DISCLOSUREThe present invention intends to take fresh water as an extracting agent to extract waste incinerator fly ash at low liquid-solid ratio and high stirring speed; the fly ash is then pulverized such that numerous substances in the fly ash can be released to generate high-concentration OH", and harmful substances such as Pb, can be shifted to dissoluble species, thus removing quickly and efficiently harmful substances in the waste incinerator fly ash for the purpose of recycling. Firstly, the present invention allows preparing waste incinerator fly ash and fresh water, conduct stirring extract at low liquid-solid ratio, then place fly ash slurry aside -for immersion extraction. Next, the fly ash slurry is subject to solid-liquid separation, the liquid waste is treated by waste water treatment facility, and the dehydrated fly ash is dried and pulverized; finally, test TCLP dissolution and Dioxin's total quantity of pulverized fly ash; if OK, the pulverized fly ash can he recycled as a harmless substance; otherwise, return to step 1 for preparation of fresh water.Figure 1
Description
A METHOD OF REMOVING QUICKLY WASTE INCINERATOR FLY ASH
1. Field of the Invention
The present invention relaies generally to a processing technology of waste incinerator fly ash, and more particularly to an innovative one which is designed to remove quickly harmful substances in the waste incinerator fly ash, such as: heavy metal and Dioxin, allowing to processing and recycling them in compliance with relevant regulations. 2. Description of Related Art
The waste fly ash generated by the incinerator is referred to as waste incinerator fly ash. As the incineration temperature is normally between 850-1,050°C, the heavy metal in the waste, with its boiling point lower than the incineration temperature, is easily gasified, and then fed into air pollution control facility of the incineration plant along with waste gas and fly ash, where the heavy metal is condensed and attached onto the fly ash. In addition, if organic substance containing chlorine, etc, is contained in the waste, precursor synthesis and de novo synthesis will occur during incineration and air pollution process to form a very little of Dioxins, most of which are attached onto fly ash.
The hazardous property of waste incinerator fly ash is determined by the criterion of harmful substances: {1} the concentration of heavy metal subject to toxicity characteristic leaching procedure (TCLP), and (2) Dioxin’s total toxicity equivalent concentration {Dioxin total quantity). Generally, it is required to check regularly the heavy metals concentration and Dioxin’s total quantity from the toxicity characteristic leaching procedure of fly ash for domestic incineration plants; in most cases, Pb dissolution is higher than the common specified value of TCLP (e.g. 5.0 mg/L}, and in some cases Cd dissolution is higher than the specified value of TCLP (e.g: 1.0 mg/L), with the dissolution of other heavy metals lower than the specified value of TCLE.
Besides, Dioxin’s total quantity of fly ash from the incineration plants is lower than the common specified value {e.g 1.0 ng -TEQ/g). It is thus learnt that, the waste incinerator fly ash is a harmful waste caused by heavy metal with its dissolution higher . than TCLP specified value. : Traditionally, the waste incinerator fly ash is firstly processed through solidification/stabilization process with cement and chemical stabilizer, and then the fly ash condensate is conveyed to an independent landfill site for burying. However, such method makes it impossible to recycle the fly ash, but also increases the waste volume and space of landfill site; moreover, due to incorrect solidification of fly ash or rainfall in the landfill site, the harmful substances in the fly ash condensate are easily dissolved into the water and soil environment. So, it is important to know how to remove efficiently harmful substances in the waste incinerator fly ash, rather than solidification and burying, such that the fly ash could be recycled in compliance with the relevant regulations (including: heavy metal dissolution and Dioxin’s total quantity of TCLP).
Amongst the patents of processing fly ash and bottom slag (bottom ash or bottom residue) generated from incineration or high-temperature treatment of waste or other substances, solidification/stabilization or gasification or high-temperature treatment technologies are generally adopted based on the operating mechanisms: the solid . harmful substances in the fly ash are solidified with the solidification and stabilization agent; or decornposed or converted into gaseous substances and then removed in high temperature; or inorganic substances in fly ash are melted to packet the fly ash without dissolution. With the use of extraction mechanism, the solid harmiul substances in the flv ash are removed to Hguid phase, as shown in US patent No. 7635756 obtained by the inventor.
The inventor of the present invention has developed the technology herein through continuous improvements,
The primary objective of the present invention is to provide a method of removing quickly harmful substances in the waste incinerator fly ash, which are sourced from the converged fly ash of the waste incineration plant (namely, converged fly ash before entering solidification facility}; so, it enables to remove quickly and efficiently the harmful fly ash and reuse i in a recvelable and environmental-friendly way.
The present invention provides a method of removing quickly harmful substances in the waste incinerator fly ash, which contains the following steps:
Preparation of fly ash and fresh water: prepare the converged fy ash generated by the waste incineration plant as well as necessary fresh water;
Stirring extraction: add fresh water into the fly ash at low Hguid-selid ratio and then conduct stirring extraction;
Immersion extraction: immerse the fly ash slurry extracted at high speed, such that the substances are released from the fy ash;
Solid-liquid separation: conduct solid-liguid separation of fly ash slurry after immersion extraction;
Drying: dry up the fly ash to remove moisture after solid-liquid separation;
Pulverization: the dried fly ash must be pulverized to avoid agglomeration for further use;
Test: test TCLP heavy metal dissolution and Dioxin’s total quantity of pulverized fly ash; if OK, the pulverized fly ash can be recycled as a harmless substance; otherwise, return to step 1.
FIG. 1 is a flow chart of the present invention.
The present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of a prefarred embodiment of the present invention with reference to the accompanying drawings:
FIG. 1: a flow process chart of the preferred embodiment of the present invention.
Referring to FIG. 1--a preferred embodiment of the present invention showing a method of removing quickly harmful substances in the waste incinerator {ly ash, which comprises the following steps:
Step 1: preparation of fly ash and fresh water 100: the fly ash refers to the converged fly ash collected by air pollution control facility of waste incineration plant; the fresh water refers to tap water, distilled water or softening water.
Step 2: stirring extraction 110: add fresh water into the fly ash, fully stir the fly ash and fresh water at high speed, then pulverize the fly ash for extraction, “liquid weight: solid fly ash (dry weight) ratio™ 2-5: 1, stirring speed: 500-1,500 rpm, duration: &
3-10 min. In this step, fly ash is stirred and pulverized at high speed, such that the substances in the fly ash are quickly released for mass fransfer; in addition, numerous
OH tons are formed from the reaction of the alkali metal, alkaline -earth metals oxide and water in the fly ash; owing to low lgquid-solid ratio, the concentration of OH ions is high, so that most of Ph, Zn species and some Cd species in the fly ash will have reaction with OH to form dissoluble species for shifting to the liquid phase; the other heavy metal species of lower concentration in the fy ash easily form precipitate of hydroxide for chernical reaction.
Step 3: immersion extraction 120: after high-speed stirring extraction, place fly ash slurry aside 10-60 min for immersion extraction. [n this step, the substances in pulverized fly ash are continuously released to realize slow diffusion between solid and liquid phases.
Step 4: solid-liguid separation 130: the fly ash shury after immersion exiraction is separated from the Hguid waste by means of pressure filtering, vacuum filtering or centrifugal filtering. In this step, the solid fly ash is separated from hguid waste for further processing of the solid fly ash prior to recycling; in addition, the liguid waste containing heavy metals, ete, must be treated by waste water treatment facility.
Step 5: drying 140: after solid-liquid separation, heat up the fly ash at 100--200°C to remove moisture in the fly ash,
Step 6: pulverization 150: pulverize the dried fly ash to the particles less than 1.0 min using a common pulverizer, Pulverization is required for further recycling since fly ash is easily dried and agglomerated.
Step 7: test 160: test TCLP heavy metal dissolution and Dioxin’s total quantity of pulverized fly ash; if OK, the pulverized fly ash can be recycled as a harmless substance; otherwise, return to step 1.
Additionally, the liquid waste containing heavy metals, etc, must be treated by waste water treatment facility after solid-liquid separation. As Dioxin in fly ash isn’t dissoluble in water, acid and alkali, a slight amount of Dioxins in the fly ash is shifted to waste water by means of high-speed stirring, pulverization of fly ash and solid-liquid separation, along with some water and tiny colloid. Thus, the solid Dioxin in the fly ash is also lower than the specified value.
Here are the results of converged fly ash generated from a big incineration plant based on the patent technology of the present invention: { TTT T After treatment
Specified Prior ta
I TJS = 2: 1.200 rpm: L/S = 3 600 rpm; walue treatment i 5 min 10 min
TCLP [Cd | 1.0 ND | ND ND mg/L) {Pb 150 ]103 ND TRAST
Dioxin i 1.0 0.287 (ng FTEQ/g)
Note: -- means no test is conducted. oo
It is thus learnt that, cheap fresh water is taken as the extracting agent of the present invention, and the fly ash is pulverized to generate easily high-concentration
OH at low liquid-solid ratio and high operating speed, such that harmful substances such as Pb, can be shifted cost-effectively from solid to liguid phase within a short period of time; moreover, the harmless fly ash after treatment can be used as a recyclable and environmental-friendly raw material.
Hence, the patent claims gre made hereunder.
Claims (8)
- WHAT IS CLAIMED 18:: 1. A method of removing quickly harmful substances in the waste incinerator fly ash, which contains at least the following steps: preparation of fly ash and fresh water: prepare the converged fly ash generated by the waste incineration plant and also prepare fresh water as the extracting agent; stirring extraction: add fresh water into the fly ash, fully stir the fly ash and fresh water, and then pulverize the fly ash for extraction; immersion extraction: place fly ash slurry aside after stirring extraction for immersion extraction; solid-liquid separation: dehydrate fly ash slurry after immersion extraction, so as to remove fly ash from liquid waste; drying: dry up the fly ash after solid-liquid separation; pulverization: pulverize the dried fly ash; and test: test TCLP dissolution and Dioxin’s total quantity of pulverized fly ash; if OK, the pulverized fly ash can be recycled as a harmless substance; otherwise, return to step 1.
- 2. The method defined in Claim 1, wherein the fly ash in step 1 refers to the converged fly ash collected by air pollution control facility of waste incineration plant,i.e. converged fly ash before entering solidification facility.
- 3. The method defined in Claim 1, wherein the fresh water in siep 1 refers to tap water, distilled water or softening water.
- 4, The method defined in Claim 1, wherein the “liquid weight: solid fly ash (dry weight) ratio” in step 2 is: 2-5: 1, stirring speed: S00-1,500 rpm, duration: 3-10 ) min. &
- 5. The method defined in Claim 1, wherein fly ash shury in step 3 is placed aside 10-60 mun for inunersion extraction.
- 6. The method defined in Clan 1, wherein the fly ash slurry in step 4 is separated from the liquid waste by means of pressure filtering, vacuum filtering or centrifugal filtering.
- 7. The method detined in Claim 1, wherein the fly ash in step § is heated up at 100-200°C to dry up the fly ash after solid-Hiquid separation.3. The method defined in Claim 1, wherein the dried fly ash in step 6 is pulverized to the particles less than 1.0 nun using a common pulverizer.
- 8. The method defined in Claim 1, wherein the test methods and judgment value in step 7 shall be subject to the regulatory test methods and specified value. #
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW99132445A TWI472356B (en) | 2010-09-24 | 2010-09-24 | Method for quickly removing hazardous matters from mswi fly ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SG179361A1 true SG179361A1 (en) | 2012-04-27 |
Family
ID=45941185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SG2011064177A SG179361A1 (en) | 2010-09-24 | 2011-09-07 | Method for removing harmful substances in waste incinerator fly ash |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN102416395B (en) |
| SG (1) | SG179361A1 (en) |
| TW (1) | TWI472356B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104084415A (en) * | 2014-07-02 | 2014-10-08 | 天津壹鸣环境工程有限公司 | Technology for reducing waste incineration fly ash via water logging pretreatment |
| CN104926167B (en) * | 2015-05-21 | 2017-02-01 | 天津城建大学 | Method for consolidating waste incineration fly ash heavy metal through microorganism cement mineralization |
| CN106363793A (en) * | 2016-08-26 | 2017-02-01 | 安徽盛运重工机械有限责任公司 | Fly ash solidifying treatment system |
| TWI789600B (en) * | 2020-06-29 | 2023-01-11 | 國立聯合大學 | Method for enhancing stabilization and detoxification of thermal treatment facilities collected powder |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005288201A (en) * | 2002-04-17 | 2005-10-20 | Pbm Kk | Method and apparatus for removing harmful substance |
| JP2006142228A (en) * | 2004-11-22 | 2006-06-08 | Miyoshi Oil & Fat Co Ltd | Solid waste disposal method |
| TWI349656B (en) * | 2007-07-03 | 2011-10-01 | Univ Tamkang | Process for stabilizing heavy metal in municipal solid waste incinerator ash and recycling the ash |
| JP2009240952A (en) * | 2008-03-31 | 2009-10-22 | Sumitomo Osaka Cement Co Ltd | Waste treatment method |
| CN101462835B (en) * | 2008-09-01 | 2011-08-03 | 上海市固体废物处置中心 | Innocent treatment method and apparatus for refuse burning flyash |
| TWI368715B (en) * | 2008-09-16 | 2012-07-21 | Univ Nat United | Detoxification method for heavy metal-containing incineration fly ash |
-
2010
- 2010-09-24 TW TW99132445A patent/TWI472356B/en active
-
2011
- 2011-03-15 CN CN201110062118.3A patent/CN102416395B/en active Active
- 2011-09-07 SG SG2011064177A patent/SG179361A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN102416395B (en) | 2014-11-19 |
| TWI472356B (en) | 2015-02-11 |
| TW201212974A (en) | 2012-04-01 |
| CN102416395A (en) | 2012-04-18 |
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