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RISS 인기검색어
- 검색키워드
- 저자 : ( Jae-hyop Son ) (검색결과 2 건)
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Son, Jae Hyop,Baek, Jin Woong,Choi, Angelo Earvin Sy,Park, Hung Suck ELSEVIER 2017 JOURNAL OF CLEANER PRODUCTION Vol.166 No.-
<P><B>Abstract</B></P> <P>This study examines the function of Thiomer solidification as a novel environment friendly construction material and its immobilization capacity over heavy metals in the automotive shredder residue (ASR) bottom ash. The morphology of the mixture using a field emission-scanning electron microscopy consistently illustrated the effective bonding between Thiomer and sand towards ASR bottom ash due to acting as fillers to reduce the gaps in its surface during Thiomer solidification. A D-optimal mixture design was further utilized in order to evaluate and optimize the parameters of Thiomer (25–35 wt%), ASR bottom ash (30–45 wt%) and sand (30–40 wt%) on the response of compressive strength. Result showed that optimum compressive strength of 55.9 MPa can be attained at 33.6, 36.4 and 30.0 wt% of Thiomer, ASR bottom ash and sand, respectively. The solidified Thiomer specimen showed superior structural strength over ordinary Portland cement concrete at curing time of 1 and 7 days. Furthermore, a mean heavy metal concentrations of 0.055 ppm Cu<SUP>2+</SUP>, 0.105 ppm Zn<SUP>2+</SUP>, 0.045 ppm Pb<SUP>2+</SUP>, 0.078 ppm Cr<SUP>6+</SUP> and 0.002 ppm Cd<SUP>2+</SUP> were achieved at various mixture designs in the heavy metal immobilization which satisfies stringent environmental standards. Thus, the application of Thiomer proves to be a promising construction material that can pose as an alternative over common cement due to promoting high durability and being eco-friendly.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel synthesis of Thiomer solidification in ASR bottom ash. </LI> <LI> Utilized D-optimal mixture design to determine optimum result for compressive strength. </LI> <LI> Thiomer solidification showed superior compressive strength over ordinary cement. </LI> <LI> Results indicate an efficient heavy metals immobilization by Thiomer solidification. </LI> <LI> Thiomer proves to be an innovative eco-friendly construction material. </LI> </UL> </P>
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( Yousuf Jamal ),( Jae-hyop Son ),( Sang-hyeop Cha ),( In-sung Jo ),( Nguyen Viet Pham ),( Hung-suck Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Lipids account for 30-40% of the biological and chemical oxygen demand in wastewater treatment plant influents. High amounts of lipids are also present in microbial communities that treat the wastewater in typical conventional activated sludge plants. Production of biodiesel from high price pure triglyceride based feed stock is economically not feasible although conversion technology is mature in Korea. Keeping this idea of using low cost feedstock for biodiesel production a laboratory scale experimental work was setup while using different solvents for lipid extraction and their conversion to mono-alkyl esters also known as biodiesel. Some of the parameters studied for one and two step conversion were ex situ and in situ extraction of lipids, using the low cost polar and non-polar solvents, alcohol to lipid molar ratio, volume of homogeneous acidic catalyst required for optimized conversion. It was found that solvent type used for lipid extraction from wastewater sludge has a major impact on the saponifiable oil extraction, along with the moisture content of the sludge. Extraction temperature also influences the oil content in the extract. Increased extraction yield of 72% oil was noted with a mixture of polar and non- polar solvents. Highest ester yield of 95% recorded in two hours with one step esterification method.
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