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RISS 인기검색어
- 검색키워드
- 저자 : Stefaniuk, Magdalena (검색결과 2 건)
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Stefaniuk, Magdalena,Tsang, Daniel C.W.,Ok, Yong Sik,Oleszczuk, Patryk Elsevier 2018 Journal of hazardous materials Vol.349 No.-
<P><B>Abstract</B></P> <P>The bioavailable PAHs (freely dissolved concentration, Cfree) were determined in sewage sludge (SL) or sewage sludge and biochar (BC) amended soil. SL or SL with a 2.5, 5 or 10% of BC was applied to the soil. The study was conducted as a long-term field experiment. Addition of BC to SL at a dose of 2.5 and 5% did not affect the content of Cfree PAHs in soils. However a significant difference (by 13%) in Cfree PAHs content was noted in experiment with 10% addition of BC. During the experiment, the concentration of Cfree PAHs in SL- and SL/BC-amended soil decreased. In particular sampling terms the content of Cfree PAHs in SL/BC-amended soil was significantly lower comparing to the Cfree PAHs content in SL-amended soil. After 18 months, Cfree PAH content was significantly lower in SL/BC-amended soil than in the experiment with SL alone, and did not differ significantly from the Σ16 Cfree content in the control soil. The largest decrease relative to the soil with sewage sludge alone was observed for 3-, 5- and 6-ring PAHs. This is the first field-based evidence that biochar soil amendment was effective to reduce of the Cfree of PAHs in sewage sludge-amended soils.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Freely dissolved (C<SUB>free</SUB>) PAHs was evaluated in sewage sludge-biochar-amended soil. </LI> <LI> Application of sewage sludge alone increased C<SUB>free</SUB> PAHs content in soil. </LI> <LI> Biochar added with sewage sludge contributed to a decrease in the C<SUB>free</SUB> PAHs. </LI> <LI> Reduction of C<SUB>free</SUB> PAHs depended on biochar contribution in sewage sludge. </LI> </UL> </P>
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Kamil Krzywiński,Łukasz Sadowski,Damian Stefaniuk,Aleksei Obrosov,Sabine Weiß 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.1
Nowadays, the recycled fine aggregate sourced from construction and demolition waste is not frequently used in manufacturing of epoxy resin coatings. Therefore, the main novelty of the article is to prepare green epoxy resin coatings modified with recycled fine aggregate in a replacement ratio of natural fine aggregate ranged from 20 to 100%. The microstructural properties of the aggregates and epoxy resin were analyzed using micro-computed tomography, scanning electron microscopy and nanoindentation. The macroscopic mechanical properties were examined using pull-off strength tests. The highest improvement of the mechanical properties was observed for epoxy resin coatings modified with 20% of natural fine aggregate and 80% of recycled fine aggregate. It has been found that even 100% of natural fine aggregate can be successfully replaced using the recycled fine aggregate with consequent improvement of the pull-off strength of analyzed epoxy resin coatings. In order to confirm the assumptions resulting from the conducted research, an original analytical and numerical failure model proved the superior behavior of modified coating was developed.
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