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RISS 인기검색어
- 검색키워드
- 주제어 : ASR thermal residue (검색결과 3 건)
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Lee, Chi-Hyeon,Truc, Nguyen Thi Thanh,Lee, Byeong-Kyu,Mitoma, Yoshiharu,Mallampati, Srinivasa Reddy Elsevier 2015 Journal of hazardous materials Vol.296 No.-
<P><B>Abstract</B></P> <P>This study was conducted to synthesize and apply a nano-size calcium dispersed reagent as an immobilization material for heavy metal-contaminated automobile shredder residues (ASR) dust/thermal residues in dry condition. Simple mixing with a nanometallic Ca/CaO/PO<SUB>4</SUB> dispersion mixture immobilized 95–100% of heavy metals in ASR dust/thermal residues (including bottom ash, cavity ash, boiler and bag filter ash). The quantity of heavy metals leached from thermal residues after treatment by nanometallic Ca/CaO/PO<SUB>4</SUB> was lower than the Korean standard regulatory limit for hazardous waste landfills. The morphology and elemental composition of the nanometallic Ca/CaO-treated ASR residue were characterized by field emission scanning election microscopy combined with electron dispersive spectroscopy (FE-SEM/EDS). The results indicated that the amounts of heavy metals detectable on the ASR thermal residue surface decreased and the Ca/PO<SUB>4</SUB> mass percent increased. X-ray diffraction (XRD) pattern analysis indicated that the main fraction of enclosed/bound materials on ASR residue included Ca/PO<SUB>4</SUB>− associated crystalline complexes, and that immobile Ca/PO<SUB>4</SUB> salts remarkably inhibited the desorption of heavy metals from ASR residues. These results support the potential use of nanometallic Ca/CaO/PO<SUB>4</SUB> as a simple, suitable and highly efficient material for the gentle immobilization of heavy metals in hazardous ASR thermal residue in dry condition.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanometallic Ca/CaO/PO<SUB>4</SUB> for heavy metals immobilization in ASR residue. </LI> <LI> Heavy metals immobilization in dry condition attained about 95–100%. </LI> <LI> Remaining heavy metals were lower than the Korean standard regulatory limit. </LI> <LI> The amounts of heavy metals detectable on the ASR dust surface decreased. </LI> <LI> Nanometallic Ca/CaO/PO<SUB>4</SUB> has a promising potential for heavy metal remediation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Schematic representation of possible mechanisms determining the heavy metals immobilization efficiencyof ASR dust/thermal residues after treatment with nanometallic Ca/CaO/PO<SUB>4</SUB>.</P> <P>[DISPLAY OMISSION]</P>
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Baek, J.W.,Mallampati, S.R.,Park, H.S. Pergamon Press ; Elsevier Science Ltd 2016 Waste management Vol.49 No.-
The present paper reports the novel synthesis and application of Thiomer solidification for heavy metal immobilization in hazardous automobile shredder residues and industrial solid waste (ASR/ISW) thermal residues. The word Thiomer is a combination of the prefix of a sulfur-containing compound ''Thio'' and the suffix of ''Polymer'' meaning a large molecule compound of many repeated subunits. To immobilize heavy metals, either ASR/ISW thermal residues (including bottom and fly ash) was mixed well with Thiomer and heated at 140<SUP>o</SUP>C. After Thiomer solidification, approximately 91-100% heavy metal immobilization was achieved. The morphology and mineral phases of the Thiomer-solidified ASR/ISW thermal residue were characterized by field emission-scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction (XRD), which indicated that the amounts of heavy metals detectable on the ASR/ISW thermal residue surface decreased and the sulfur mass percent increased. XRD indicated that the main fraction of the enclosed/bound materials on the ASR/ISW residue contained sulfur associated crystalline complexes. The Thiomer solidified process could convert the heavy metal compounds into highly insoluble metal sulfides and simultaneously encapsulate the ASR/ISW thermal residue. These results show that the proposed method can be applied to the immobilization of ASR/ISW hazardous ash involving heavy metals.
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( Soyoung Han ),( Yeon-seok Choi ),( Sang-kyu Choi ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
Automobile Shredded Residue (ASR) occurs during the waste automobile treatment process, and about 25% of the weight of the scrap car is generated as waste. Most of the car wastes, over 70% of the weight, are composed of 31% of fibers, 22% of expanded polystyrene, 20% of plastics including the rest of the car wastes, rubber, earth, glass, wood, paper and wires. Most of these materials have a high calorific value, and the amount of heat of the plastic is the highest at 9,000 kcal / kg, the rubber 5,000 kcal / kg, the wire 4,900 kcal / kg, the foam 4,500 kcal / kg and the fiber 4,000 kcal /kg. When used as an auxiliary fuel, there are many benefits in terms of economic and energy recovery. However, since most of the ASR is a polymer organic substance, toxic and corrosive gas is generated in the process of incineration, and the incinerator operation has many troublesome with high calorific value and the generated corrosive gas. At present, pyrolysis technology is reclaimed as one of the recycling methods of waste plastics in Korea. In this respect, it is necessary to consider the pyrolysis thermal decomposition of ASR, which is composed mostly of polymers. In this study, pyrolysis test is performed under the isothermal and non-isothermal conditions of nitrogen atmosphere. The fundamental research data of thermal characteristics for pyrolysis of ASR, and the activation energy which can calculate pyrolysis reaction rate is obtained by gravimetric analysis. In addition, the chemical composition and the calorific value of the solid phase ASR are analyzed and used as the basic research data of the ASR pyrolysis study and process.
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