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RISS 인기검색어
- 검색키워드
- 저자 : Mohammad Nazrul ISLAM (검색결과 41 건)
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Islam, Mohammad Nazrul,Jo, Young-Tae,Park, Jeong-Hun Springer-Verlag 2016 Environmental Earth Sciences Vol.75 No.12
<P>In this study, column leaching with artificial road runoff experiments was conducted for 30 days under intermittent leaching. The heavy metal content and partitioning in the soil used in columns were characterized before and after the leaching experiments. A leaching model, PHREEQC, was used to simulate the metal speciation changes during leaching. A large portion of Cu and Pb were leached out with ARR at the early leaching stage and a slow decrease then occurred of the metal leaching toward the end of leaching period. The content of Cu and Pb associated with the oxidizable fraction (organic and sulfide bound metals) was decreased, while the content of metals associated with carbonate fraction increased by about twofold for Pb and threefold for Cu. Geochemical modeling demonstrated that Pb speciation may be dominated by carbonate in the leached soil. Geochemical modeling also indicated that the solution was under saturated with respect to the alite, calcite, and huntite mineral phases, while carbonate minerals such as annite and cerussite, and muscovite controlled the leachability of the metals.</P>
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Remediation of PAHs contaminated soil by extraction using subcritical water
Mohammad Nazrul Islam,조영태,박정훈 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
The remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated soil has been investigated by extraction using continuous flowing subcritical water. Water temperature ranging from 100 to 300 8C,extraction time ranging from 15 to 60 min, and flow rate ranging from 0.5 to 2.0 mL/min were investigated to determine their effect on the removal efficiencies of target PAHs. More than 95%extraction of the phenanthrene, fluoranthene, and pyrene from contaminated soil was observed at 300 8C for 30 min and 250 8C for 60 min at a constant pressure of 100 bar. However, naphthalene was almost completely extracted only at a comparatively low temperature of 150 8C and extraction time of up to 30 min and a pressure of 100 bar. The subcritical water flow rate of 0.5 mL/min was recommendable in this study. The extraction efficiency of PAHs was extremely dependent on water temperature, since the dielectric constant (polarity) of water could be dramatically lowered by raising the water temperature. These results suggest that soils contaminated by persistent organic chemicals such as PAHs can be easily remediated by extraction using pure water under a high temperature without any modification.
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Islam, Mohammad Nazrul,Park, Keum-Joo,Yoon, Hyung-Sun Korean Society for Agricultural Machinery 2012 바이오시스템공학 Vol.37 No.2
Purpose: Methane production potential in aerobic digestion was assessed according to feed to inoculum (F/I) ratio for food waste only, and mixing ratio of two materials for food waste and swine manure to give a basic data for the design of anaerobic digestion system. Methods: Anaerbic digestion test was performed using a lab scale batch reactor at $35^{\circ}C$ for six different feed to inoculum (F/I) ratios (0.50, 0.72, 1.14, 1.50, 2.14 and 3.41), three food waste to swine manure ratios (100:0, 60:40 and 40:60) with two different loading concentrations (10g VS/L and 30g VS/L). Results: For food waste only, the highest biogas yield of 1008 mL/gVS was obtained at 0.50 of F/I. For the co-digestion of food waste and swine manure mixture, the highest biogas yield of 1148 mL/gVS was obtained at a mixing ratio of 40:60 with loading concentration of 10g VS/L. Conclusions: F/I ratio for the food waste only, mixing ratio of food waste and swine manure, and co-substrate loading rate affected the biogas production rate. For the low loading rate, there was not so much difference according to the mixing ratio of food waste and swine manure, but for the high loading rate higher biogas yield was acquired for the co-digestion of food waste and swine manure than for the food waste alone (mixing ratio, 100:0).
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Remediation of soil contaminated with lubricating oil by extraction using subcritical water
Mohammad Nazrul Islam,박정훈,조영태 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The remediation of lubricating oil contaminated soil was investigated by extraction using subcritical water. The effects of temperature and time on extraction efficiency were studied by performing eight individual extractions and varying the subcritical water temperature (200, 225, 250, and 275℃) and extraction time (90, 120, 180, and 240 min) in a dynamic mode. Also, a comparison was carried out of the feasibility of two operational modes, namely, dynamic and static-dynamic mode. Of the 25,088 mg/kg of lubricating oil as the total petroleum hydrocarbon (TPH) concentration in untreated soil, the residual concentration was found to be 500 and 235 mg/kg for after 120 min extraction in a lab-scale apparatus and 150 min extraction in a 30-fold scale-up experiment, respectively, at 275℃ in static-dynamic mode. The result of this study showed the significant effect of the static-dynamic mode on extraction efficiency. The time and volume of water needed for the static-dynamic mode were much lower than those needed for the dynamic mode. These results are of practical interest in developing the subcritical water extraction technology for extraction of lubricating oil and, in a broad sense, petroleum hydrocarbons contaminated soil.
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Thermodynamic and kinetic study for subcritical water extraction of PAHs
Mohammad Nazrul Islam,박정훈,조영태,정선국 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Four models were used to describe the subcritical water extraction’ (SCWE) kinetics of polycyclic aromatic hydrocarbons (PAHs) at elevated temperatures in this work. The subcritical water extraction profiles obtained at temperatures of 200 8C and 250 8C were fitted with four models to presume the extraction mechanism parameters which could provide conceptual design to develop scale up methodology from laboratory SCWE devices. Among the four models, the two-site kinetic desorption model gave the best description of SCWE of phenanthrene, fluoranthene, and pyrene. Both the model analysis and experimental results suggested that the first desorption step is more important than the volumetric mass transfer process in this study. The desorption activation energy attained for extraction of phenanthrene, fluoranthene, and pyrene in this study were calculated to be 57, 52, and 70 kJ/mol,respectively. Conclusively, the model analysis could give information on the controlling step of PAHs extraction in SCWE process.
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LORENTZIAN ALMOST r-PARA-CONTACT STRUCTURE IN TANGENT BUNDLE
Islam Khan, Mohammad Nazrul,Jun, Jae-Bok Chungcheong Mathematical Society 2014 충청수학회지 Vol.27 No.1
Almost contact and almost complex structures in the tangent bundle have been studied by K. Yano and S. Ishihara[5] and others. In the present paper, we have studied Lorentzian almost r-para-contact structure in the tangent bundle. Some results related to Lie-derivative have been studied.
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Islam, Mohammad Nazrul,Park, Jeong-Hun Springer 2018 JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT Vol. No.
<P>Due to the abundant supply and suitable physicochemical characteristics of livestock manure, it may be a useful biomass to produce biofuels, such as 'bio-oil.' Hydrothermal liquefaction is a promising method for converting such wet biomasses into a liquid fuels and has attracted attention worldwide. In this review, the current state of research on the hydrothermal liquefaction of livestock manure biomasses is summarized. The effect of operating parameters on the yield of bio-oil is also reviewed. The fundamental characteristics of raw manure biomasses and converted oils are outlined and discussed in the paper. To reduce the use of fossil fuel and nuclear energy, the South Korean government has pledged to increase renewable energy. Based on findings from a literature review, it can be concluded that there is a chance for Korea to advance bio-oil production from the abundant and tremendous energy potential of swine manure by a hydrothermal liquefaction process.</P>
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( Mohammad Nazrul Islam ),( Keum Joo Park ),( Hyung Sun Yoon ) 한국농업기계학회 2012 바이오시스템공학 Vol.37 No.2
Methane production potential in aerobic digestion was assessed according to feed to inoculum (F/I) ratio for food waste only, and mixing ratio of two materials for food waste and swine manure to give a basic data for the design of anaerobic digestion system. Methods: Anaerbic digestion test was performed using a lab scale batch reactor at 35oC for six different feed to inoculum (F/I) ratios (0.50, 0.72, 1.14, 1.50, 2.14 and 3.41), three food waste to swine manure ratios (100:0, 60:40 and 40:60) with two different loading concentrations (10g VS/L and 30g VS/L). Results: For food waste only, the highest biogas yield of 1008 mL/gVS was obtained at 0.50 of F/I. For the co-digestion of food waste and swine manure mixture, the highest biogas yield of 1148 mL/gVS was obtained at a mixing ratio of 40:60 with loading concentration of 10g VS/L. Conclusions: F/I ratio for the food waste only, mixing ratio of food waste and swine manure, and co-substrate loading rate affected the biogas production rate. For the low loading rate, there was not so much difference according to the mixing ratio of food waste and swine manure, but for the high loading rate higher biogas yield was acquired for the co-digestion of food waste and swine manure than for the food waste alone (mixing ratio, 100:0)
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Islam, Mohammad Nazrul,Sultana, Shirin,Alam, Md. Jobaidul Korea Genome Organization 2020 Genomics & informatics Vol.18 No.3
The mitochondrial genome of a species is an essential resource for its effective conservation and phylogenetic studies. In this article, we present sequencing and characterization of the complete mitochondrial genome of a threatened labeonine fish, Cirrhinus reba collected from Khulna region of Bangladesh. The complete mitochondrial genome was 16,597 bp in size, which formed a circular double-stranded DNA molecule containing a total of 37 mitochondrial genes (13 protein-coding genes, 2 ribosomal RNA genes, and 22 transfer RNA genes) with two non-coding regions, an origin of light strand replication (OL) and a displacement loop (D-loop), similar structure with other fishes of Teleostei. The phylogenetic tree demonstrated its close relationship with labeonine fishes. The complete mitogenome of Cirrhinus reba (GenBank no. MN862482) showed 99.96% identity to another haplotype of Cirrhinus reba (AP013325), followed by 90.18% identity with Labeo bata (AP011198).
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