JP2005305297A - Insolubilization and solidification system for heavy metal polluted soil - Google Patents
Insolubilization and solidification system for heavy metal polluted soil Download PDFInfo
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- JP2005305297A JP2005305297A JP2004125642A JP2004125642A JP2005305297A JP 2005305297 A JP2005305297 A JP 2005305297A JP 2004125642 A JP2004125642 A JP 2004125642A JP 2004125642 A JP2004125642 A JP 2004125642A JP 2005305297 A JP2005305297 A JP 2005305297A
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 46
- 239000002689 soil Substances 0.000 title claims abstract description 44
- 238000007711 solidification Methods 0.000 title claims abstract description 41
- 230000008023 solidification Effects 0.000 title claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 114
- 239000010802 sludge Substances 0.000 claims abstract description 80
- 238000002156 mixing Methods 0.000 claims abstract description 38
- 239000008187 granular material Substances 0.000 claims abstract description 30
- 238000011282 treatment Methods 0.000 claims abstract description 22
- 238000005469 granulation Methods 0.000 claims abstract description 12
- 230000003179 granulation Effects 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 10
- 238000013019 agitation Methods 0.000 claims abstract description 7
- 239000010419 fine particle Substances 0.000 claims abstract description 7
- 238000012546 transfer Methods 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 238000005056 compaction Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 23
- 229910001868 water Inorganic materials 0.000 abstract description 23
- 238000012545 processing Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 22
- 239000004568 cement Substances 0.000 description 15
- 238000010828 elution Methods 0.000 description 14
- 238000003756 stirring Methods 0.000 description 14
- 229910052785 arsenic Inorganic materials 0.000 description 8
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000011361 granulated particle Substances 0.000 description 5
- 235000019353 potassium silicate Nutrition 0.000 description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- -1 alkali metal salt Chemical class 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229910052979 sodium sulfide Inorganic materials 0.000 description 4
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 239000002956 ash Substances 0.000 description 3
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000002738 chelating agent Substances 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- 239000011669 selenium Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910052586 apatite Inorganic materials 0.000 description 1
- 125000000223 arsonoyl group Chemical group [H][As](*)(*)=O 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000011437 continuous method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052587 fluorapatite Inorganic materials 0.000 description 1
- 229940077441 fluorapatite Drugs 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
Description
本発明は、鉛、砒素、水銀、カドミウムなどの重金属が付着した焼却灰、汚泥、土壌、底質、石粉、再生粉から重金属が溶出しないように封じ込める重金属汚染土壌の不溶化・固化システムに関する。 The present invention relates to a system for insolubilizing and solidifying heavy metal-contaminated soil in which heavy metals are contained so as not to elute from incinerated ash, sludge, soil, sediment, stone powder, and regenerated powder to which heavy metals such as lead, arsenic, mercury, and cadmium are attached.
この種のシステムとしては、従来、次のようなものが知られている。
Ａ．第１従来例（特許文献１参照）
建設土木工事で発生する建設発生土や掘削工事で発生する水分量の多い建設汚泥などの発生土を脱水機で所望の含水比になるように脱水処理し、その脱水処理された発生土に吸水剤および固化剤を添加して攪拌混合してゲル化させてから内部物質を分断して粒状化させて安定した品質の粒状体を生成するようにしている。
The following are known as this type of system.
A. First conventional example (see Patent Document 1)
The generated soil such as construction sludge generated in construction engineering works and construction sludge with high water content generated in excavation work is dehydrated with a dehydrator to the desired moisture content, and the dehydrated generated soil is absorbed by water. An agent and a solidifying agent are added, mixed by stirring and gelled, and then the internal substance is divided and granulated to produce stable quality granules.
Ｂ．第２従来例（特許文献２参照）
トンネル掘削作業時の建設汚泥や浚渫作業時の浚渫土などの高含水の発生土に固化剤を添加するとともに吸水剤を添加して攪拌混合機により攪拌混合し、攪拌混合された発生土を解砕造粒機に供給し、発生土の内部物質を分断して粒子化させて粒状体を生成するようにしている。
B. Second conventional example (see Patent Document 2)
A solidifying agent is added to the high-moisture generated soil such as construction sludge during tunnel excavation work and dredged soil during dredging work, and a water-absorbing agent is added and stirred and mixed with a stirrer to dissolve the mixed soil. The material is supplied to a crushing and granulating machine, and the internal material of the generated soil is divided and granulated to generate a granular material.
Ｃ．第３従来例（特許文献３参照）
焼結炉、高炉、電気炉、転炉等製鉄所の各工場より発生したダストを沈殿させた後、その沈殿物を脱水処理して水分２５〜３５％程度のフィルターケーキを得、そのフィルターケーキに生石灰粉とドライダストを混合して凝粒化し、篩分けした後に粗粒は再解砕し、篩下は造粒機に送って造粒処理するようにしている。
C. Third conventional example (see Patent Document 3)
After precipitating dust generated from each steelworks such as a sintering furnace, blast furnace, electric furnace, converter, etc., the precipitate is dehydrated to obtain a filter cake having a moisture content of about 25 to 35%. In addition, quick lime powder and dry dust are mixed and agglomerated, and after sieving, the coarse particles are pulverized again, and the sieve is sent to a granulator for granulation treatment.
Ｄ．第４従来例（特許文献４参照）
浄水場から発生する汚泥や、河川、湖沼等に堆積した汚泥等を脱水処理した脱水汚泥を粒度５ｍｍ以下に解砕し、その解砕物を攪拌式造粒機によって団粒状ペレットに造粒し、そのペレットを含水率約１０％以下に乾燥させ、乾燥されたペレットを焼成温度約８００〜１１００℃で焼成するようにしている。
D. Fourth conventional example (see Patent Document 4)
The sludge generated from the water purification plant, the sludge accumulated in rivers, lakes, etc. is dewatered and crushed to a particle size of 5 mm or less, and the crushed material is granulated into a granular pellet by a stirring granulator, The pellets are dried to a moisture content of about 10% or less, and the dried pellets are fired at a firing temperature of about 800 to 1100 ° C.
Ｅ．第５従来例（特許文献５参照）
粉状体、又は泥状体からなる産業廃棄物の原料にセメントと水ガラス溶液とを添加し、攪拌することによって泥状の混合体となし、混合体を丸めて多数の粒状体を形成し、更に、その粒状体に水ガラス溶液を噴霧して、粒状体の表面をコーティングした後に、乾燥して硬化し、有害物質が溶出しないようにしている。
E. Fifth conventional example (see Patent Document 5)
Cement and water glass solution are added to the raw material of industrial waste consisting of powder or mud and stirred to form a mud, and the mixture is rolled to form a large number of granules. Furthermore, after spraying a water glass solution on the granular material to coat the surface of the granular material, the granular material is dried and cured to prevent the toxic substances from eluting.
Ｆ．第６従来例（特許文献６参照）
産業廃棄物をアルカリ金属塩のアルカリ性水溶液とコバルトアミン錯体の酸性ないし中性溶液との組み合わせからなる処理剤により処理し、その産業廃棄物をセメントと水の存在下で0.5~20mmの範囲内の粒径のものに造粒し、その造粒物をモルタルにより被覆し、有害重金属の溶出を抑制できるようにしている。
F. Sixth conventional example (see Patent Document 6)
Industrial waste is treated with a treating agent comprising a combination of an alkaline aqueous solution of an alkali metal salt and an acidic or neutral solution of a cobalt amine complex, and the industrial waste is treated within the range of 0.5 to 20 mm in the presence of cement and water. Granulated to a particle size, and the granulated material is covered with mortar to suppress elution of harmful heavy metals.
Ｇ．第７従来例（特許文献７参照）
石膏系廃材を粉砕して得た粒子を適当な粒径（粗骨材の場合であれば、粒径25mm以下）に造粒した後、その表面を、セメント原料および水からなるセメント系原料で被覆し、加熱加圧下で炭酸ガスに晒して炭酸化処理し、硫酸カルシウム成分の溶出を抑制した硬質な被覆膜が形成された廃石膏利用骨材を得るようにしている。
G. Seventh conventional example (see Patent Document 7)
After granulating the gypsum-based waste material to an appropriate particle size (in the case of coarse aggregate, particle size of 25 mm or less), the surface is made of cement-based material consisting of cement raw material and water. It is coated and carbonized by exposing to carbon dioxide under heat and pressure to obtain a waste gypsum-based aggregate on which a hard coating film with suppressed elution of the calcium sulfate component is formed.
Ｈ．第８従来例（特許文献８参照）
セメント等では処理が難しい鉛、六価クロム、砒素、セレン等による汚染土壌を泥土状となし、所定の水と酸化マグネシウムまたは酸化マグネシウムに酸性固化助剤を加えたものを添加・固化して、重金属の近接土壌への溶出を防止するようにしている。
The soil contaminated with lead, hexavalent chromium, arsenic, selenium, etc., which is difficult to treat with cement, etc. is made muddy, and the specified water and magnesium oxide or magnesium oxide added with an acid solidification aid are added and solidified. It prevents elution of heavy metals into nearby soil.
しかしながら、上述のような第１〜第４従来例の場合、処理物に重金属が含まれている場合に、その溶出を防止できない欠点があった。 However, in the case of the first to fourth conventional examples as described above, there is a drawback that elution cannot be prevented when the processed material contains heavy metal.
また、上述のような第５〜第７従来例の場合、いずれにおいてもセメントあるいは水ガラスで粒状体を形成した後、セメントまたは水ガラスで被覆、あるいは加熱加圧下で炭酸化するものであり、重金属の溶出抑制は物理的な封じ込めによってなされるもので、その効果は未だ不十分であった。 In the case of the fifth to seventh conventional examples as described above, in any case, after forming a granular body with cement or water glass, it is coated with cement or water glass, or is carbonated under heating and pressure, The suppression of elution of heavy metals is achieved by physical containment, and the effect is still insufficient.
また、作製された造粒物の粒度分布が広く、特に粗大粒子や微粒子において重金属等を封じ込める上で信頼性が低くなる欠点があった。 In addition, the granulated product thus produced has a wide particle size distribution, and there is a drawback that reliability is lowered when heavy metals and the like are contained in coarse particles and fine particles.
また、第８従来例の場合、酸化マグネシウムを使用したものでは、土壌と処理剤との混合精度が十分ではなく、高い固化強度が得られ難いことや、重金属の不溶化効果やその長期安定性の確保に問題があった。 Further, in the case of the eighth conventional example, in the case of using magnesium oxide, the mixing accuracy between the soil and the treatment agent is not sufficient, and it is difficult to obtain high solidification strength, the insolubilizing effect of heavy metals and the long-term stability thereof. There was a problem in securing.
本発明は、このような事情に鑑みてなされたものであって、請求項１に係る発明は、適正な水分を有するスラッジを良好に処理して重金属を良好に封じ込めるとともに、それらの重金属汚染土壌の不溶化・固化処理を効率良く行えるようにすることを目的とし、請求項２に係る発明は、適正な水分量より少ない場合でも容易に対処できるようにすることを目的とし、請求項３に係る発明は、適正な水分量よりも多い水分を有するスラッジを良好に処理して重金属を良好に封じ込めるとともに、それらの重金属汚染土壌の不溶化・固化処理を効率良く行えるようにすることを目的とする。 This invention is made | formed in view of such a situation, and while the invention which concerns on Claim 1 treats the sludge which has a suitable water | moisture content well, and contains heavy metal well, those heavy metal contaminated soil The purpose of the invention according to claim 2 is to enable easy handling even when the amount of water is less than the appropriate amount of water. An object of the present invention is to satisfactorily contain heavy metals by properly treating sludge having a moisture content higher than an appropriate amount of moisture, and to efficiently insolubilize and solidify those heavy metal-contaminated soils.
請求項１に係る発明の重金属汚染土壌の不溶化・固化システムは、上述のような目的を達成するために、
重金属を含んだ洗浄分級処理後の粒径０．５ｍｍ未満の細粒子（以下、スラッジと称する）を定量供給するスラッジ供給手段と、
固形化材を定量供給する固形化材供給手段と、
前記スラッジ供給手段から定量供給されるスラッジを第１の移送手段を介して受け入れるとともに前記固形化材供給手段から定量供給される固形化材を第２の移送手段を介して受け入れてスラッジと固形化材とを連続的に混合・造粒して一次造粒物を作製する連続式混合造粒機と、
不溶化材を定量供給する不溶化材供給手段と、
前記連続混合造粒機からの一次造粒物を第３の移送手段を介して受け入れるとともに前記不溶化材供給手段からの不溶化材を第４の移送手段を介して受け入れて一次造粒物を混合・造粒ならびに圧密して二次造粒物を作製し、その二次造粒物の表面を不溶化材でコーティングして連続的に排出する連続式攪拌造粒機とを備えて構成する。
The insolubilization / solidification system for heavy metal-contaminated soil of the invention according to claim 1 is provided in order to achieve the above-described object.
Sludge supply means for quantitatively supplying fine particles (hereinafter referred to as sludge) having a particle size of less than 0.5 mm after washing and classifying treatment containing heavy metal;
A solidifying material supply means for quantitatively supplying the solidifying material;
The sludge supplied quantitatively from the sludge supply means is received via the first transfer means, and the solidified material fixedly supplied from the solidification material supply means is received via the second transfer means to sludge and solidify. A continuous mixing granulator that continuously mixes and granulates the material to produce a primary granulated product,
An insolubilizing material supply means for quantitatively supplying the insolubilizing material;
The primary granulated product from the continuous mixing granulator is received through the third transfer means and the insolubilized material from the insolubilized material supply means is received through the fourth transfer means to mix the primary granulated product. A secondary agglomerated product is produced by granulation and compaction, and the surface of the secondary granulated product is coated with an insolubilizing material and continuously stirred and granulated.
（作用・効果）
請求項１に係る発明の重金属汚染土壌の不溶化・固化システムの構成によれば、スラッジ供給手段にスラッジを、固形化材供給手段に固形化材を、そして、不溶化材供給手段に不溶化材をそれぞれ投入することにより、スラッジと固形化材との混合・造粒による一次造粒物の作製、一次造粒物の混合・造粒ならびに圧密による二次造粒物の作製、および、不溶化材による二次造粒物の表面のコーティングを連続的に行うことができる。
(Action / Effect)
According to the structure of the insolubilization / solidification system of the heavy metal contaminated soil according to the first aspect, the sludge is supplied to the sludge supply means, the solidification material is supplied to the solidification material supply means, and the insolubilization material is supplied to the insolubilization material supply means. The primary granulated material is produced by mixing and granulating sludge and solidified material, the secondary granulated material is produced by mixing and granulating and compacting the primary granulated material, and the insolubilized material. The surface of the next granulated product can be continuously coated.
したがって、適正な水分を有するスラッジを固形化材と混合して造粒ならびに圧密してからコーティングするから、スラッジを良好に処理して重金属を良好に封じ込めることができる。 Therefore, since sludge having appropriate moisture is mixed with the solidifying material, granulated and compacted before coating, the sludge can be treated well to contain heavy metals well.
しかも、スラッジを圧密するから、減容化できるとともに取り扱いを容易にでき、かつ、重金属の溶出を強度の大きい状態で防止できて再利用できる。 In addition, since the sludge is consolidated, the volume can be reduced and handling can be facilitated, and elution of heavy metals can be prevented in a high strength state and can be reused.
そのうえ、一連の処理を連続的に行えるから、重金属汚染土壌の不溶化・固化処理を効率良く行うことができる。 In addition, since a series of treatments can be performed continuously, insolubilization and solidification treatment of heavy metal contaminated soil can be performed efficiently.
また、請求項２に係る発明は、前述のような目的を達成するために、
請求項１に記載の重金属汚染土壌の不溶化・固化システムにおいて、
連続式混合造粒機に、スラッジに適度な水分を供給するスプレーノズルを付設して構成する。
In order to achieve the above-described object, the invention according to claim 2
In the insolubilization / solidification system of heavy metal contaminated soil according to claim 1,
A continuous mixing granulator is provided with a spray nozzle for supplying appropriate moisture to the sludge.
（作用・効果）
請求項２に係る発明の重金属汚染土壌の不溶化・固化システムの構成によれば、処理するスラッジに含まれる水分が少ないときに、例えば、砕石スラッジの場合、含水比で１０〜２５ｗｔ％、好ましくは１５〜２０ｗｔ％にするといったように、適正な水分量になるようにスプレーノズルから適度な水分を供給することができる。
(Action / Effect)
According to the structure of the insolubilization / solidification system for heavy metal contaminated soil of the invention according to claim 2, when the moisture contained in the sludge to be treated is small, for example, in the case of crushed stone sludge, the moisture content is 10 to 25 wt%, preferably Appropriate moisture can be supplied from the spray nozzle so as to obtain an appropriate amount of moisture, such as 15 to 20 wt%.
したがって、適正な水分量より少ない場合でも、水分の補充により容易に対処できて造粒を効果的に行うことができる。 Therefore, even when the amount of water is less than the appropriate amount, it can be easily dealt with by replenishing water and granulation can be performed effectively.
また、請求項３に係る発明は、前述のような目的を達成するために、
重金属を含んだ洗浄分級処理後の粒径０．５ｍｍ未満の細粒子（以下、スラッジと称する）と乾粉とを混合解砕して定量供給する混合解砕機と、
固形化材を定量供給する固形化材供給手段と、
前記混合解砕機から定量供給されるスラッジを第１の移送手段を介して受け入れるとともに前記固形化材供給手段から定量供給される固形化材を第２の移送手段を介して受け入れてスラッジと固形化材とを連続的に混合・造粒する連続式混合造粒機と、
不溶化材を定量供給する不溶化材供給手段と、
前記連続混合造粒機からの一次造粒物を第３の移送手段を介して受け入れるとともに前記不溶化材供給手段からの不溶化材を第４の移送手段を介して受け入れて一次造粒物を混合・造粒ならびに圧密して二次造粒物を作製し、その二次造粒物の表面を不溶化材でコーティングして連続的に排出する連続式攪拌造粒機とを備えて構成する。
In order to achieve the above-described object, the invention according to claim 3
A mixing pulverizer that mixes and pulverizes fine particles (hereinafter referred to as sludge) having a particle diameter of less than 0.5 mm after washing and classifying treatment containing heavy metals and dry powder;
A solidifying material supply means for quantitatively supplying the solidifying material;
The sludge supplied quantitatively from the mixing crusher is received via the first transfer means, and the solidified material supplied quantitatively from the solidifying material supply means is received via the second transfer means, and sludge and solidified. A continuous mixing granulator that continuously mixes and granulates the material,
An insolubilizing material supply means for quantitatively supplying the insolubilizing material;
The primary granulated product from the continuous mixing granulator is received through the third transfer means and the insolubilized material from the insolubilized material supply means is received through the fourth transfer means to mix the primary granulated product. A secondary agglomerated product is produced by granulation and compaction, and the surface of the secondary granulated product is coated with an insolubilizing material and continuously stirred and granulated.
（作用・効果）
請求項３に係る発明の重金属汚染土壌の不溶化・固化システムの構成によれば、混合解砕機にスラッジと乾粉を、固形化材供給手段に固形化材を、そして、不溶化材供給手段に不溶化材をそれぞれ投入することにより、スラッジと固形化材との混合・造粒による一次造粒物の作製、一次造粒物の混合・造粒ならびに圧密による二次造粒物の作製、および、不溶化材による二次造粒物の表面のコーティングを連続的に行うことができる。
(Action / Effect)
According to the structure of the insolubilization / solidification system for heavy metal contaminated soil of the invention according to claim 3, sludge and dry powder are mixed in the mixed pulverizer, the solidification material is in the solidification material supply means, and the insolubilization material is in the insolubilization material supply means. To make primary granulated material by mixing and granulating sludge and solidifying material, mixing and granulating primary granulated material and secondary granulated material by compaction, and insolubilizing material The surface of the secondary granulated product by can be continuously coated.
したがって、適正な水分量よりも多い水分を有するスラッジを固形化材と混合して造粒ならびに圧密してからコーティングするから、スラッジを良好に処理して重金属を良好に封じ込めることができる。 Therefore, since sludge having a water content higher than the proper water content is mixed with the solidifying material and granulated and compacted before coating, the sludge can be treated well to contain heavy metals well.
しかも、スラッジを圧密するから、減容化できるとともに取り扱いを容易にでき、かつ、重金属の溶出を強度の大きい状態で防止できて再利用できる。 In addition, since the sludge is consolidated, the volume can be reduced and handling can be facilitated, and elution of heavy metals can be prevented in a high strength state and can be reused.
そのうえ、一連の処理を連続的に行えるから、重金属汚染土壌の不溶化・固化処理を効率良く行うことができる。 In addition, since a series of treatments can be performed continuously, insolubilization and solidification treatment of heavy metal contaminated soil can be performed efficiently.
請求項１に係る発明の重金属汚染土壌の不溶化・固化システムによれば、スラッジ供給手段にスラッジを、固形化材供給手段に固形化材を、そして、不溶化材供給手段に不溶化材をそれぞれ投入することにより、スラッジと固形化材との混合・造粒による一次造粒物の作製、一次造粒物の混合・造粒ならびに圧密による二次造粒物の作製、および、不溶化材による二次造粒物の表面のコーティングを連続的に行うことができる。 According to the heavy metal-contaminated soil insolubilization / solidification system of the first aspect of the present invention, the sludge is supplied to the sludge supply means, the solidification material is supplied to the solidification material supply means, and the insolubilization material is supplied to the insolubilization material supply means. To produce a primary granulated product by mixing and granulating sludge and solidifying material, mixing and granulating the primary granulated product and producing secondary granulated product by compaction, and secondary forming by insolubilizing material. The coating of the surface of the granules can be carried out continuously.
したがって、適正な水分を有するスラッジを固形化材と混合して造粒ならびに圧密してからコーティングするから、スラッジを良好に処理して重金属を良好に封じ込めることができる。 Therefore, since sludge having appropriate moisture is mixed with the solidifying material, granulated and compacted before coating, the sludge can be treated well to contain heavy metals well.
しかも、スラッジを圧密するから、減容化できるとともに取り扱いを容易にでき、かつ、重金属の溶出を強度の大きい状態で防止できて再利用できる。 In addition, since the sludge is consolidated, the volume can be reduced and handling can be facilitated, and elution of heavy metals can be prevented in a high strength state and can be reused.
そのうえ、一連の処理を連続的に行えるから、重金属汚染土壌の不溶化・固化処理を効率良く行うことができる。 In addition, since a series of treatments can be performed continuously, insolubilization and solidification treatment of heavy metal contaminated soil can be performed efficiently.
次に、本発明の実施例を図面に基づいて詳細に説明する。 Next, embodiments of the present invention will be described in detail with reference to the drawings.
図１は、本発明の重金属汚染土壌の不溶化・固化システムに係る実施例を示す全体概略構成図であり、重金属を含有した汚染土壌を一次洗浄機１で洗浄処理し、ベルトコンベア２により洗浄・分級機３に搬送する。 FIG. 1 is an overall schematic diagram showing an embodiment according to an insolubilization / solidification system for heavy metal-contaminated soil of the present invention. Contaminated soil containing heavy metal is washed with a primary washing machine 1 and washed with a belt conveyor 2. Transport to classifier 3.
ベルトコンベア２の搬送終端では、粒径が５ｍｍ以上の浄化土壌が再利用のために取出される。また、一次洗浄機１で発生する洗浄排水も洗浄・分級機３に供給する。 At the conveyance end of the belt conveyor 2, the purified soil having a particle size of 5 mm or more is taken out for reuse. In addition, cleaning wastewater generated in the primary cleaning machine 1 is also supplied to the cleaning / classifying machine 3.
洗浄・分級機３では、洗浄処理によって有害物質を洗浄除去して無害化処理した２〜５ｍｍの浄化土壌、０．５〜２ｍｍの浄化土壌それぞれを分級処理して再利用のために取出し、残余のスラッジは水処理装置４に搬送する。 The cleaning / classifying machine 3 classifies 2 to 5 mm of purified soil and 0.5 to 2 mm of purified soil that have been detoxified by washing and removing harmful substances by washing, and removes them for reuse. The sludge is conveyed to the water treatment device 4.
水処理装置４においては、スラッジを沈降分離させ、スラッジを除去した後の水は、鉱酸、有機酸、界面活性剤などの洗浄助剤を添加して一次洗浄機１のベルトコンベア２部分および洗浄・分級機３にリサイクルする。 In the water treatment device 4, the water after the sludge is settled and separated and the sludge is removed is added with a cleaning aid such as a mineral acid, an organic acid, a surfactant and the belt conveyor 2 portion of the primary cleaning machine 1 and Recycle to washing / classifying machine 3.
水処理装置４で分離されたスラッジは、脱水機５により脱水処理してから重金属汚染土壌の不溶化・固化システム６に供給し、造粒ならびに固化処理するとともに不溶化処理した後、再利用資材などとして最終処分するようになっている。 The sludge separated by the water treatment device 4 is dehydrated by the dehydrator 5 and then supplied to the insolubilization / solidification system 6 of the heavy metal contaminated soil. After granulation and solidification treatment and insolubilization treatment, the sludge is reused. Final disposal is planned.
重金属汚染土壌の不溶化・固化システム６には、図２の全体構成図に示すように、造粒に適した水分に調整された、重金属を含んだ洗浄分級処理後の粒径０．５ｍｍ未満の細粒子（以下、スラッジと称する）を定量供給するスラッジ供給手段としてのスラッジ用定量供給機７と、固形化材を定量供給する固形化材供給手段としての固形化材用定量供給機８とが備えられている。 In the insolubilization / solidification system 6 of heavy metal contaminated soil, as shown in the overall configuration diagram of FIG. 2, the particle size after washing and classification treatment including heavy metal adjusted to moisture suitable for granulation is less than 0.5 mm. A sludge quantitative supply device 7 as a sludge supply means for quantitatively supplying fine particles (hereinafter referred to as sludge), and a solidifying material quantitative supply device 8 as a solidifying material supply means for quantitatively supplying a solidified material. Is provided.
スラッジ用定量供給機７および固形化材用定量供給機８の下方に第１および第２のホッパー９，１０と連続式混合造粒機１１が備えられ、スラッジ用定量供給機７から自然落下によって定量供給されるスラッジを第１のホッパー９を介して受け入れるとともに、固形化材用定量供給機８から自然落下によって定量供給されるスラッジを第２のホッパー１０を介して受け入れ、連続式混合造粒機１１において、スラッジと固形化材とを連続的に混合・造粒して一次造粒物を作製するように構成されている。 The first and second hoppers 9 and 10 and the continuous mixing granulator 11 are provided below the sludge fixed amount supply unit 7 and the solidifying material fixed amount supply unit 8, and the sludge fixed amount supply unit 7 is naturally dropped. The sludge supplied in a fixed amount is received through the first hopper 9 and the sludge supplied in a fixed amount by the natural fall from the solidifying material fixed supply device 8 is received through the second hopper 10 to continuously mix and granulate. In the machine 11, the sludge and the solidifying material are continuously mixed and granulated to produce a primary granulated product.
連続式混合造粒機１１の下方に第３のホッパー１２と連続式攪拌造粒機１３とが備えられ、連続式混合造粒機１１の横側方でかつ連続式攪拌造粒機１３の上方箇所に、第４のホッパー１４と、不溶化材を定量供給する不溶化材供給手段としての不溶化材用定量供給機１５とが備えられ、連続式混合造粒機１１から自然落下によって供給される一次造粒物を第３のホッパー１２を介して受け入れるとともに、不溶化材用定量供給機１５から自然落下によって定量供給される不溶化材を第４のホッパー１４を介して受け入れる。 A third hopper 12 and a continuous agitation granulator 13 are provided below the continuous mixing granulator 11, on the side of the continuous mixing granulator 11 and above the continuous agitation granulator 13. The primary hopper 14 is provided with a fourth hopper 14 and an insolubilizing material quantitative feeder 15 as insolubilizing material supply means for quantitatively supplying the insolubilizing material, and is supplied from the continuous mixing granulator 11 by natural fall. The granular material is received via the third hopper 12 and the insolubilized material quantitatively supplied from the insolubilized material quantitative feeder 15 by natural fall is received via the fourth hopper 14.
この連続式攪拌造粒機１３において、連続式攪拌造粒機１３の攪拌槽１３ａ内の攪拌羽根１３ｂの回転中心から約１／３の位置に一次造粒物および不溶化材それぞれを供給し、攪拌羽根１３ｂの回転数と攪拌槽１３ａの排出ゲート（図示せず）の高さとの相関により、一次造粒物を混合・造粒ならびに圧密して二次造粒物を作製し、その造粒の進行により粒径の大きくなった二次造粒物を攪拌槽１３ａの上部に移行させ、不溶化材を添加して二次造粒物の表面を不溶化材でコーティングして攪拌槽１３ａの上部から連続的に排出するように構成されている。 In this continuous stirring granulator 13, the primary granulated material and the insolubilized material are respectively supplied to the position of about 1/3 from the rotation center of the stirring blade 13b in the stirring tank 13a of the continuous stirring granulator 13 for stirring. Based on the correlation between the rotational speed of the blade 13b and the height of the discharge gate (not shown) of the stirring tank 13a, the primary granulated material is mixed, granulated, and compacted to produce a secondary granulated material. The secondary granulated product having a larger particle diameter due to the progress is transferred to the upper part of the stirring tank 13a, the insolubilizing material is added, and the surface of the secondary granulated product is coated with the insolubilizing material and continuously from the upper part of the stirring tank 13a It is constituted so that it may exhaust.
図示しないが、連続式混合造粒機１１にはスプレーノズルが設置されていて、スラッジに含有される水分量が適正水分よりも少ないときに、例えば、砕石スラッジの場合、含水比で１０〜２５ｗｔ％、好ましくは１５〜２０ｗｔ％にするといったように、結合液となる水を噴霧して造粒を効果的に行えるように構成されている。 Although not shown, when the spray nozzle is installed in the continuous mixing granulator 11 and the amount of water contained in the sludge is less than the appropriate moisture, for example, in the case of crushed sludge, the water content ratio is 10 to 25 wt. %, Preferably 15 to 20 wt%, so that granulation can be performed effectively by spraying water as a binding liquid.
第１のホッパー９の上方には、スラッジ用定量混合機７と置換可能に、スラッジと乾粉とを混合解砕して定量供給する混合解砕機１６が設けられ、スラッジに含有される水分量が適正水分よりも多い場合に、スラッジと乾粉とを混合解砕して連続式混合造粒機１１での造粒を効果的に行えるように構成されている。 Above the first hopper 9, there is provided a mixing / pulverizing machine 16 that mixes and pulverizes sludge and dry powder and supplies it quantitatively so that it can replace the quantitative mixing machine 7 for sludge. When it is more than the appropriate moisture, the sludge and the dry powder are mixed and pulverized so that the granulation by the continuous mixing granulator 11 can be effectively performed.
次に、実験例について説明する。 Next, experimental examples will be described.
重金属汚染スラッジを入手することは困難であることから模擬汚染スラッジを作成することにした。 Since it was difficult to obtain heavy metal contaminated sludge, we decided to create a simulated contaminated sludge.
すなわち、砕石スラッジ（平均粒子径Ｄ50＝１５．８μｍ）に所定の濃度に調整した砒素（Ａｓ）の水溶液を添加して、高速攪拌型造粒機内で均一に混合・分散することにより、模擬汚染スラッジを調製した。ここで砒素の試薬にはＮａ2ＨＡｓＯ4を採用した。また固形化材には固化材系、不溶化材（コーティング材）にセメント系を用いた。 That is, by adding an aqueous solution of arsenic (As) adjusted to a predetermined concentration to crushed stone sludge (average particle diameter D 50 = 15.8 μm), and uniformly mixing and dispersing in a high-speed agitation granulator, Contaminated sludge was prepared. Here, Na 2 HAsO 4 was adopted as the arsenic reagent. A solidifying material was used as the solidifying material, and a cement system was used as the insolubilizing material (coating material).
各実験条件は、次の通りである。 Each experimental condition is as follows.
（１）模擬汚染スラッジ
（２）模擬汚染スラッジ＋固形化材（１０ｗｔ％）の造粒物［回分式］
（３）模擬汚染スラッジ＋固形化材（１０ｗｔ％）の造粒物［連続式］
（４）（２）の造粒物＋不溶化材（１０ｗｔ％）
（５）（３）の造粒物＋不溶化材（１０ｗｔ％）
模擬汚染スラッジに添加する固形化材の割合は１０ｗｔ％である。また、不溶化材はスラッジに対して１０ｗｔ％とした。
(1) Simulated contaminated sludge (2) Granulated product of simulated contaminated sludge + solidified material (10 wt%) [batch type]
(3) Granulated product of simulated contaminated sludge + solidified material (10 wt%) [continuous type]
(4) Granulated product of (2) + insolubilized material (10 wt%)
(5) Granulated product of (3) + insolubilized material (10 wt%)
The ratio of the solidifying material added to the simulated contaminated sludge is 10 wt%. The insolubilizing material was 10 wt% with respect to the sludge.
汚染土壌の溶出量を環境基準の約６００倍に設定し、連続式と回分式により不溶化・固化処理の実験を行い、溶出量の測定を環告４６号法に準じて行った。その結果を図３に示す。砒素の溶出量は、固形化材だけを添加・混合した連続式および回分式の場合［条件（２）、（３）］、環境基準を満たしていない。連続式の溶出量が回分式に比べて大きいのは、竪型の連続式混合造粒機１１での滞留時間が短いことによるものと考えられる。しかしコーティング処理を施すことにより［条件（４）、（５）］、溶出量が環境基準以下に抑えられていることがわかる。つまり不溶化層の形成が効果的に作用していることが明らかである。 The elution amount of the contaminated soil was set to about 600 times the environmental standard, and experiments on insolubilization and solidification treatment were conducted by a continuous method and a batch method, and the elution amount was measured according to the Notification No. 46 method. The result is shown in FIG. The amount of elution of arsenic does not meet the environmental standards in the case of the continuous type and batch type in which only the solidifying material is added and mixed [conditions (2), (3)]. The reason why the continuous elution amount is larger than that of the batch type is considered to be due to the short residence time in the vertical continuous mixing granulator 11. However, it can be seen that by applying the coating treatment [conditions (4) and (5)], the elution amount is suppressed to an environmental standard or less. That is, it is clear that the formation of the insolubilized layer works effectively.
見かけ密度の測定結果を図４に示す。ここで見かけ密度が大きい値を示すほど重質化（造粒粒子内の空隙が小）されていることになる。この図４の結果から、コーティング処理された造粒粒子は汚染スラッジに比べて重質化されていることがわかる［条件（４）、（５）］。つまり、砒素の不溶化・固化のために、固形化材および不溶化材を添加することで増量になるが、造粒を行うことにより減容化される。汚染土壌に対する減容化率は２１％であった。このように減容化されるのは、連続式攪拌造粒機１３のせん断・転動ならびに球形化による。 The measurement result of the apparent density is shown in FIG. Here, the larger the apparent density, the heavier (the voids in the granulated particles are smaller). From the results of FIG. 4, it can be seen that the granulated particles subjected to the coating treatment are heavier than the contaminated sludge [conditions (4) and (5)]. That is, the amount is increased by adding a solidifying material and an insolubilizing material for insolubilization and solidification of arsenic, but the volume is reduced by granulation. The volume reduction rate for the contaminated soil was 21%. The volume reduction in this way is due to the shearing / rolling and spheroidization of the continuous stirring granulator 13.
造粒粒子そのものに注目して、粒子強度を測定した結果を図５に示す。粒子強度が１．５ＭＰａ付近であることからコンクリート用骨材として再利用できると考えられた。更に固化・不溶化された造粒粒子は、球形であるので、流動性に優れており、ハンドリングが容易である。なお、固化・不溶化された造粒粒子は、長期において安定であることが、カラム試験などにより確認されている。 FIG. 5 shows the result of measuring the particle strength while paying attention to the granulated particles themselves. Since the particle strength was around 1.5 MPa, it was considered that it could be reused as an aggregate for concrete. Furthermore, since the solidified / insolubilized granulated particles are spherical, they are excellent in fluidity and easy to handle. It has been confirmed by a column test or the like that the granulated particles solidified and insolubilized are stable for a long period of time.
上記実施例では、システムを竪型で構成し、設置に要する敷地面積が小さくて済むようにしているが、各処理機間の移送に水平方向のコンベアを設けて水平型に構成しても良い。 In the above-described embodiment, the system is configured in a bowl shape so that the site area required for installation may be small. However, a horizontal conveyor may be provided for transfer between the processing machines.
このことに鑑み、スラッジ用定量供給機７または混合解砕機１６から連続式混合造粒機１１上の第１のホッパー９にスラッジを自然落下により移送する構成、ならびに、その構成に代えて水平コンベアを用いる構成などをして第１の移送手段と称する。 In view of this, a configuration in which sludge is transferred by natural dropping from the sludge quantitative supply device 7 or the mixing / pulverizing device 16 to the first hopper 9 on the continuous mixing granulator 11, and a horizontal conveyor instead of the configuration This is referred to as first transfer means.
また、固形化材用定量供給機８から連続式混合造粒機１１上の第２のホッパー１０に固形化材を自然落下により移送する構成、ならびに、その構成に代えて水平コンベアを用いる構成などをして第２の移送手段と称する。 In addition, a configuration in which the solidified material is transferred by natural fall from the solidified material quantitative feeder 8 to the second hopper 10 on the continuous mixing granulator 11, a configuration in which a horizontal conveyor is used instead of the configuration, and the like. This is referred to as second transfer means.
また、連続式混合造粒機１１から連続式攪拌造粒機１３上の第３のホッパー１２に一次造粒物を自然落下により移送する構成、ならびに、その構成に代えて水平コンベアを用いる構成などをして第３の移送手段と称する。 Moreover, the structure which transfers a primary granulated material by the natural fall to the 3rd hopper 12 on the continuous stirring granulator 13 from the continuous mixing granulator 11, the structure which uses a horizontal conveyor instead of the structure, etc. This is referred to as third transfer means.
更に、不溶化材用定量供給機１５から連続式攪拌造粒機１３上の第４のホッパー１４に不溶化材を自然落下により移送する構成、ならびに、その構成に代えて水平コンベアを用いる構成などをして第４の移送手段と称する。 Further, the insolubilizing material is transferred from the constant amount feeder 15 for insolubilizing material to the fourth hopper 14 on the continuous stirring granulator 13 by natural fall, and a configuration using a horizontal conveyor instead of the configuration is used. This is referred to as a fourth transfer means.
固形化材としては、ポルトランドセメント、混合セメント（高炉スラグセメント、フライアッシュセメント、シリカセメント）、アルミナセメント、セメント系固化材（一般軟弱土用、高有機質土用、六価クロム対策固化材、発塵抑制固化材など）、酸化マグネシウムなどが挙げられる。それらに、補助材として、石炭灰、高炉スラグ、石膏（半水、二水、無水）、生石灰、消石灰、シリカフューム、石灰石などを添加しても良い。 As solidification materials, Portland cement, mixed cement (blast furnace slag cement, fly ash cement, silica cement), alumina cement, cement-based solidification material (general soft soil, high organic soil, hexavalent chromium countermeasure solidification material, Dust suppressive solidifying material), magnesium oxide and the like. To them, coal ash, blast furnace slag, gypsum (half water, two water, anhydrous), quicklime, slaked lime, silica fume, limestone and the like may be added.
固形化材には、硫酸第一鉄、硫酸第二鉄、塩化第一鉄、塩化第二鉄、硫化ナトリウム、硫黄、燐酸、燐酸ナトリウム、水酸化アパタイト、フッ素アパタイト、キレート剤、次亜塩素酸を併用することができる。 Solidifying materials include ferrous sulfate, ferric sulfate, ferrous chloride, ferric chloride, sodium sulfide, sulfur, phosphoric acid, sodium phosphate, hydroxide apatite, fluorapatite, chelating agents, hypochlorous acid Can be used in combination.
すなわち、重金属が砒素の場合であれば、硫酸第二鉄、塩化第二鉄が選ばれる。総水銀や鉛の場合であれば、硫化ナトリウム、キレート剤が選ばれる。六価クロムやカドミウムの場合であれば、硫化ナトリウムが選ばれる。セレンの場合であれば、硫化ナトリウム、硫酸第一鉄が選ばれる。全シアンの場合であれば、次亜塩素酸が選ばれる。このように、焼却灰、汚泥、土壌、底質、石粉、再生粉中の重金属に応じて適宜選択すれば良い。 That is, if the heavy metal is arsenic, ferric sulfate and ferric chloride are selected. In the case of total mercury or lead, sodium sulfide and a chelating agent are selected. In the case of hexavalent chromium or cadmium, sodium sulfide is selected. In the case of selenium, sodium sulfide and ferrous sulfate are selected. In the case of all cyan, hypochlorous acid is selected. Thus, what is necessary is just to select suitably according to the heavy metal in incineration ash, sludge, soil, bottom sediment, stone powder, and regenerated powder.
コーティング材としては、前述したセメントおよび補助材のほかに、水ガラス、火山灰、珪酸白土などの各種の無機物や、ＥＶＡ（エチレンビニルアセテート）、アクリル、アクリル―スチレン、ウレタン、シリコーンなどの高分子化合物など各種の材料が適用可能である。 As coating materials, in addition to the cement and auxiliary materials described above, various inorganic materials such as water glass, volcanic ash, silicate white clay, and polymer compounds such as EVA (ethylene vinyl acetate), acrylic, acrylic-styrene, urethane, silicone, etc. Various materials can be applied.
６…重金属汚染土壌の不溶化・固化システム
７…スラッジ用定量供給機（スラッジ供給手段）
８…固形化材用定量供給機（固形化材供給手段）
１１…連続式混合造粒機
１３…連続式攪拌造粒機
１５…不溶化材用定量供給機（不溶化材供給手段）
１６…混合解砕機
6 ... Insolubilization / solidification system for heavy metal contaminated soil 7 ... Sludge fixed quantity feeder (sludge supply means)
8 ... Fixed quantity feeder for solidification material (solidification material supply means)
DESCRIPTION OF SYMBOLS 11 ... Continuous mixing granulator 13 ... Continuous stirring granulator 15 ... Fixed quantity supply machine for insolubilization material (insolubilization material supply means)
16 ... Mixed crusher
Claims (3)
固形化材を定量供給する固形化材供給手段と、
前記スラッジ供給手段から定量供給されるスラッジを第１の移送手段を介して受け入れるとともに前記固形化材供給手段から定量供給される固形化材を第２の移送手段を介して受け入れてスラッジと固形化材とを連続的に混合・造粒して一次造粒物を作製する連続式混合造粒機と、
不溶化材を定量供給する不溶化材供給手段と、
前記連続混合造粒機からの一次造粒物を第３の移送手段を介して受け入れるとともに前記不溶化材供給手段からの不溶化材を第４の移送手段を介して受け入れて一次造粒物を混合・造粒ならびに圧密して二次造粒物を作製し、その二次造粒物の表面を不溶化材でコーティングして連続的に排出する連続式攪拌造粒機と、
を備えたことを特徴とする重金属汚染土壌の不溶化・固化システム。 Sludge supply means for quantitatively supplying fine particles (hereinafter referred to as sludge) having a particle size of less than 0.5 mm after washing and classifying treatment containing heavy metal;
A solidifying material supply means for quantitatively supplying the solidifying material;
The sludge supplied quantitatively from the sludge supply means is received via the first transfer means, and the solidified material fixedly supplied from the solidification material supply means is received via the second transfer means to sludge and solidify. A continuous mixing granulator that continuously mixes and granulates the material to produce a primary granulated product,
An insolubilizing material supply means for quantitatively supplying the insolubilizing material;
The primary granulated product from the continuous mixing granulator is received through the third transfer means and the insolubilized material from the insolubilized material supply means is received through the fourth transfer means to mix the primary granulated product. A continuous agitation granulator for producing a secondary granulated product by granulation and compaction, coating the surface of the secondary granulated product with an insolubilizing material, and continuously discharging;
An insolubilization / solidification system for heavy metal contaminated soil.
連続式混合造粒機に、スラッジに適度な水分を供給するスプレーノズルを付設してある重金属汚染土壌の不溶化・固化システム。 In the insolubilization / solidification system of heavy metal contaminated soil according to claim 1,
Heavy metal-contaminated soil insolubilization / solidification system with a continuous mixing granulator equipped with a spray nozzle that supplies moderate moisture to the sludge.
固形化材を定量供給する固形化材供給手段と、
前記混合解砕機から定量供給されるスラッジを第１の移送手段を介して受け入れるとともに前記固形化材供給手段から定量供給される固形化材を第２の移送手段を介して受け入れてスラッジと固形化材とを連続的に混合・造粒する連続式混合造粒機と、
不溶化材を定量供給する不溶化材供給手段と、
前記連続混合造粒機からの一次造粒物を第３の移送手段を介して受け入れるとともに前記不溶化材供給手段からの不溶化材を第４の移送手段を介して受け入れて一次造粒物を混合・造粒ならびに圧密して二次造粒物を作製し、その二次造粒物の表面を不溶化材でコーティングして連続的に排出する連続式攪拌造粒機と、
を備えたことを特徴とする重金属汚染土壌の不溶化・固化システム。 A mixing pulverizer that mixes and pulverizes fine particles (hereinafter referred to as sludge) having a particle diameter of less than 0.5 mm after washing and classifying treatment containing heavy metals and dry powder;
A solidifying material supply means for quantitatively supplying the solidifying material;
The sludge supplied quantitatively from the mixing crusher is received via the first transfer means, and the solidified material supplied quantitatively from the solidifying material supply means is received via the second transfer means, and sludge and solidified. A continuous mixing granulator that continuously mixes and granulates the material,
An insolubilizing material supply means for quantitatively supplying the insolubilizing material;
The primary granulated product from the continuous mixing granulator is received through the third transfer means and the insolubilized material from the insolubilized material supply means is received through the fourth transfer means to mix the primary granulated product. A continuous agitation granulator for producing a secondary granulated product by granulation and compaction, coating the surface of the secondary granulated product with an insolubilizing material, and continuously discharging;
An insolubilization / solidification system for heavy metal contaminated soil.
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| JP2009039666A (en) * | 2007-08-09 | 2009-02-26 | Dowa Metals & Mining Co Ltd | Method of treating arsenic by using resin, and method of transporting/storing arsenic-containing compound and arsenic |
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