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Factors Affecting the Crystal Growth of Scalenohedral Calcite by a Carbonation Process
Thenepalli Thriveni,엄남일,남성영,안영준,한춘,안지환 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.2
In the present work, we report a novel microstructure of scalenohedral calcite synthesized without any additives by a simpleand ecofriendly carbonation process carried out in a liquid-gas system as well as the effects of experimental conditions on thecrystal growth of the scalenohedral calcite phase. Various process parameters, pH, temperature, Ca(OH)2 concentration, CO2 flowrates, and the total volume concentration, were investigated to enhance the sensitivity of the process. The highest average lengthof the scalenohedral calcite was obtained at pH 6.0, temperature of 450C, Ca(OH)2 concentration of 0.2M, CO2 flow rate of 80mL/min, and total volume of 1L. The synthesized calcite was characterized by XRD, SEM, and FTIR to identify the phases and surface morphology.
( Thenepalli Thriveni ),( Jin-young Lee ),( Rajesh Kumar Jyothi ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
Rare earths (REs) are the key elements in modern high-tech industrial applications. The resources of REs are very limited. The global REs reserves were as surveys: China, Brazil, Australia, India, USA, Russia and other countries. The electrical and electronics export from South Korea was very high range. At the same time South Korean natural resources were very limited. Recycling subject is the one of the important step to achieve national demands of REs. Five REs namely dysprosium, neodymium, yttrium, europium, and terbium were criticality in matrix for short and long term (year 2025) visibility. Other REs such as cerium, lanthanum, tellurium and indium were near critical matrix. Secondary resources such as spent matrices, spent catalyst, e-waste and coal ash are the alternative sources for REs. Hydrometallurgy, the aqueous processing of the metal ions is the economical and most prominent methodology for metal recovery from coal ash processing. The role of leaching and solvent extraction techniques in REs processing from secondary resources was presented. Solvent extraction is the convenient and easy to handle lab scale to pilot scale metal recovery technologies by using commercially applicable extractants.
Environmental Effect of the Coffee Waste and Anti-Microbial Property of Oyster Shell Waste Treatment
Thenepalli, Thriveni,Ramakrishna, Chilakala,Ahn, Ji Whan The Korean Society for Energy 2017 에너지공학 Vol.26 No.2
Coffee is one of the most popular and consumed beverages in the world, which leads to a high contents of solid residue known as spent coffee grounds (SCG). As is known, coffee beans contain several classes of health related chemicals, including phenolic compounds, melanoidins, diterpenes, xanthines and carotenoids. The waste water coming out of coffee industries has high concentration of organic pollutants and is very harmful for surrounding water bodies, human health and aquatic life if discharged directly into the surface waters. Hence it is essential to treat and manage the coffee waste. Oyster shells are a waste product from mariculture that creates a major disposal problem in coastal regions of southeast Korea. In the study, the oyster shell waste was used to treat the coffee waste and its effluents. Oyster shells are calcined at $1000^{\circ}C$ for 2 h, and allowed to test the calcined CaO powder ability to inhibit the growth of bacteria in different aging coffee wastes. Calcined oyster shell powder showed anti-bacterial effect that inhibited cell growth of Escherichia coli and other bacterial forms. The antimicrobial activity of calcium oxide from oyster shell waste for biological treatment and utilization as a fertilizers with economic ecofriendly in nature.
Thenepalli Thriveni,Chilakala Ramakrsihna,안지환 한국에너지학회 2019 에너지공학 Vol.28 No.1
Currently, the global atmosphere around the world is altering at a very rapid pace. Among those changes,some are beneficial, but most of the changes are lead to destruction to our planet. The area of environmentalscience is a significant resource for learning more about these changes. Due to the urbanization, the humanpopulation is increasing, natural resources becoming very limited. To solve the limited resources issues,recycling is absolutely an alternative source for the new demands and limitations. Recycling education isvery important to raise awareness among students and their communities about the need for recycling andwhat materials are recyclable locally. In this paper, we reported the role of sustainability science andtechnology and the impact of recycling research education in the middle schools, both in developingcountries and Asian countries and also we included the brief data of global recycling of waste.