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( Su Shiung Lam ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 심포지움 Vol.2021 No.1
Microwave pyrolysis is a microwave processing technique performed using microwave heating in an inert environment that can break down and convert waste materials to produce useful liquid oil, gases, and char products. This technique has been applied for recovering the energy and chemical value of various types of waste materials, comprising forestry waste, furniture waste, fruit waste, waste cooking oil, agricultural waste, palm oil waste, etc. The pyrolysis shows advantages in providing a fast heating, relatively shorter process time and lower energy consumption, representing a method that is potentially faster and more energy efficient compared to that shown by the method commonly performed using conventional heating source. The pyrolysis produces liquid oil product that can potentially be re-used as fuel to power the pyrolysis process, hence representing and promoting a circular approach for waste management, and the oil product is potentially cleaner with promising features to also be used as feedstock for bioplastic production. The pyrolysis also produces solid products such as biochar and activated carbon that can be refined for use as catalyst in pyrolysis process, which is also a potential route for circular waste management. The solid products also possess beneficial features for application in waste treatment. Our findings show that microwave pyrolysis shows potential as a promising pyrolysis approach with improved heating performance and generation of useful products with desirable properties for circular waste management. These have led to outputs such as joint research with international partners, patent filing, company licensing, journal publications, awards and industrial partnership for prototype development, distribution and application.
Yutika Narzary,Sandeep Das,Arvind Kumar Goyal,Su Shiung Lam,Hemen Sarma,Dolikajyoti Sharma 한국식품연구원 2021 Journal of Ethnic Foods Vol.8 No.-
The cleaner production of biomass into value-added products via microbial processes adds uniqueness in terms of food quality. The microbe-mediated traditional process for transforming biomass into food is a sustainable practice in Asian food industries. The 18 fermented fish products derived through this process as well as the associated micro-flora and nutritional composition have been focused. This review aims to update the process of green conversion biomass into value-added food products for a more sustainable future. Fish products are classified based on the substrate and source of the enzymes used in fermentation, which includes the three types of technology processing discussed. According to the findings, these fermented fish contain a plethora of beneficial microbiota, making them a valuable source of probiotics that may confer nutritional and health benefits. Bacillus (12 products), Lactobacillus (12 products), Micrococcus (9 products), and Staphylococcus (9 products) were the most common bacterial genera found in 18 fermented fish products. Consuming fermented fish products is beneficial to human health due to their high levels of carbohydrate, protein, fat, and lactic acid. However, biogenic amines, which are produced by certain bacteria as a by-product of their catabolic activity, are a significant potential hazard in traditionally fermented fish.
KANNAPU HARI PRASAD REDDY,Jyothi Yadagiri,Surendar Moogi,Eilhann E.Kwon,Su Shiung Lam,박영권 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
In this study, conversion of n-propanal to produce 2-methyl-2-pentenal (C6 compound, a fuel rangeprecursor) was carried out using AMW-SBA-15 catalyst synthesized from activated marble waste (AMW)consisting mainly of Ca2+ and Mg2+ ions. AMW-SBA-15 catalysts with different weight ratios of AMW/Si(6, 12, and 18 wt. %) were prepared using single step sol-gel method. The catalytic activities wereexamined using afixed bed continuous reactor over temperature ranging from 350 425 C underatmospheric pressure. The 12AMW-SBA-15 catalysts showed superior catalytic performance with npropanalconversion of 75 % and C-6 compound selectivity of 81 % at 375 C without the need ofdeactivation for 12 h. To elucidate the structure-activity relationship, all catalysts were characterizedusing a variety of techniques. The superior performance of 12AMW-SBA-15 was ascribed to the highsurface area and smaller particle size as well as the high hydrophobicity, which controlled the hydrationof Ca2+/Mg2+ ions during the reaction.
Ryu, Hae Won,Tsang, Yiu Fai,Lee, Hyung Won,Jae, Jungho,Jung, Sang-Chul,Lam, Su Shiung,Park, Eun Duck,Park, Young-Kwon Elsevier 2019 Chemical engineering journal Vol.373 No.-
<P><B>Abstract</B></P> <P>Various MgO impregnated catalysts were used for the catalytic co-pyrolysis (CCP) of cellulose and linear low-density polyethylene (LLDPE) at 600 °C in ambient pressure. Micro reactor-gas chromatography, a semi-batch reactor, was used as a reactor and gas chromatogram/mass spectrometry/flame ionization detector were used for product detection. Three kinds of MgO impregnated catalysts, MgO/Carbon (MgO/C), MgO/Al<SUB>2</SUB>O<SUB>3</SUB>, and MgO/ZrO<SUB>2</SUB>, were prepared by the impregnation of MgO to different s, C, Al<SUB>2</SUB>O<SUB>3</SUB>, and ZrO<SUB>2</SUB>, respectively. Activities of the three MgO-impregnated catalysts were compared with 1:5 of feedstock to catalyst ratio. MgO/C produced the highest quality oil, which consisted of a large amount of aromatic hydrocarbons during the catalytic pyrolysis (CP) of cellulose. When the MgO catalysts were applied to CCP, the selectivity to aromatic hydrocarbons over MgO/C were 13.42%, which were also much higher than those over the other catalysts, including bulk MgO, demonstrating the effectiveness of the MgO/C catalyst on aromatics formation. Importantly, the experimental BTEXs (benzene, toluene, ethylbenzene, xylenes) yields of CCP over MgO/C were also much higher than the theoretical yields, highlighting the effectiveness of hydrogen-rich LLDPE on the CP of cellulose over MgO/C. Further investigation of the cellulose/LLDPE mixing ratio showed that the amount of BTEXs during the CCP of cellulose and LLDPE could be maximized by adjusting the cellulose to LLDPE mixing ratio to 25:75.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Co-pyrolysis of cellulose and LLDPE over MgO catalysts was performed. </LI> <LI> MgO catalysts with different surface area and acid/base properties were used. </LI> <LI> MgO/C has largest surface area and adequate acid-base property. </LI> <LI> MgO/C produced the largest amounts of aromatics. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Abid Farooq,Surendar Moogi,장성호,KANNAPU HARI PRASAD REDDY,Soheil Valizadeh,Ashfaq Ahmed,Su Shiung Lam,박영권 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
Steam-gasification of linear low-density polyethylene (LLDPE) waste to hydrogen-rich gas has beenstudied systematically over nickel (10 wt.%) loaded on a variety of supports (Al2O3, CeO2, and CeO2-ZrO2)synthesized using a novel solvent deficient method (SDM). The hydrogen selectivity order of the catalystswas reported as Ni/CeO2-ZrO2>Ni/CeO2>Ni/Al2O3. The highest catalytic H2 selectivity of the Ni/CeO2-ZrO2 catalyst was reported to be76 vol.%, and was attributed to the smaller nickel crystals that werefinely dispersed on the support, and to formation of Ce1-xZrxO2-d solid solutions. The Ce1-xZrxO2-d solidsolution in the Ni/CeO2-ZrO2 catalyst was observed to be bi-functional, thus reflecting the acceleration ofthe water gas shift and the oxidation of carbon to CO and CO2. The better resistance of the Ni/CeO2-ZrO2catalyst towards coke deposition also indicated its potential for commercial-scale applications for thesteam gasification of plastics. Therefore, this research provides an advanced route to recycle LLDPE plasticwaste into hydrogen fuel, which presents both economical and environmental benefits.
Phenol removal via activated carbon from co-pyrolysis of waste coal tar pitch and vinasse
Ming Gao,Xiaona Wang,Changlei Xia,Na Song,Yuhui Ma,Qunhui Wang,Tianxue Yang,Shengbo Ge,Chuanfu Wu,Su Shiung Lam 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.1
The behavior and characteristics of phenol adsorption by activated carbon produced from co-pyrolysis of coal tar pitch and vinasse were investigated. Coal tar pitch and vinasse (mass ratio of 1 : 3) were firstly co-pyrolyzed and carbonated at 400 oC for 2 h. The carbonized material produced was then soaked with saturated KOH solution and activated at 800 oC for 1 h to form activated carbon. Results from the phenol wastewater adsorption experiments suggest that pseudo-second-order kinetics and the Weber-Morris model could reflect the time-dependent adsorption behavior of phenol wastewater by the activated carbon, revealing that internal diffusion represents the rate-limiting procedure and dominant process to control the adsorption rate in the early stage of the adsorption. Monolayer adsorption played the key role during the phenol adsorption. The adsorption was an endothermic reaction in temperature ranging from 15 oC to 35 oC, indicating that the adsorption speed could be stimulated by the increasing temperature. This study establishes a theoretical foundation for the usage and the potential application of the activated carbon derived from coal tar pitch and vinasse in wastewater treatment.