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리튬 이차전지 제조 공정으로부터 발생한 리튬 폐액의 재활용을 위한 전기 투석 수처리 장치의 리튬 농축 효율에 관한 연구
한덕현 ( Deokhyun Han ),정항철 ( Hangchul Jung ),김보람 ( Boram Kim ),김대원 ( Dae-weon Kim ) 한국수처리학회 2020 한국수처리학회지 Vol.28 No.5
The rapid market growth in recent years for eco-friendly electric vehicles and more generally, energy storage technologies, has led to an increase in demand for lithium which is a major raw material for lithium secondary batteries. The technology for producing lithium ions from lithium carbonate in seawater 25 L has been developed, but there are about 60 kinds of various ionic components, which is a difficult process, and only about 4 mg of lithium is recovered. In order to meet the demand of lithium, research is being actively conducted to recycle lithium secondary batteries that contain lithium and can be recycled as a circulating resource, but there is little research on recycling of waste liquid generated during the manufacturing process of lithium secondary batteries. Wastewater of lithium is thought to be able to efficiently concentrate lithium metal during recycling using an environmentally friendly electrodialysis water treatment process. In this study, lithium was concentrated using the electrodialysis of wastewater generated during the production of lithium-ion batteries. The efficiency of the electrodialysis varied according to the applied voltage and the volume ratio of the solution. However, due to the disadvantages of employing limited current densities, optimum conditions for the process needed to be selected. Therefore, the concentration efficiency of lithium was confirmed according to the process conditions, and optimum process conditions were derived. Lithium concentrated at the optimum conditions secured a concentration increase of about 128% compared to the initial concentration of wastewater.
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논문 / 초기고형물농도가 호기성소화의 Kinetics 에 미치는 영향에 관한 연구
정연규(Youn Kyoo Choung),안규홍(Kyu Hong Ahn),박준홍(Joon Hong Park) 한국수처리학회 1994 한국수처리학회지 Vol.2 No.1
Using waste activated sludge of 4 different solid concentration levels and their batch experiments which were carried out at 20℃ and pH 7.5, the kinetics of solid degradation and behaviors of nutrients during aerobic digestion were estimated. The solid degradation coefficients and the rate coefficients of k_(dN), k_(dP), μ_N, μ_D, tend to increase linearly according to decrease of the initial solid concentration. However, the other rate coefficients related to mineralization of nutrients seemed not to be dependent upon initial solid concentration. From those results, we could explain the reason why the design of continuous inflow pattern aerobic digestion reactor is over-estimated if based upon kinetics estimated from batch experiments, and consider the ways how to apply kinetics based upon batch experiments on the design of continuous inflow aerobic digestion reactor.
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논문 / 일반폐기물 소각매립지 침출수의 고도처리에 관한 연구
현길수(Kil Soo Hyun),목원민(Satoi Kihara) 한국수처리학회 1994 한국수처리학회지 Vol.2 No.1
The purpose of this research is to investigate characteristics of landfill leachate treatment by the existing leachate treatment system which consists of nitrification and denitrification processes, biofilm treatment process, flocculation-sedimentation process, sand filtration process, and granular activated carbon (GAC)adsorption process and to evaluate the effect of the advanced treatment system added membrance process to the existing system in terms of wastewater reuse. The results presented that the removal rate of the existing system were than 95% for BOD, COD, SS, and Nitrogen, while the efficiency of Cl^- and Ca^(2+) removals was relatively low as approximately 20%. Added membrane process-electrodialysis to the GAC beds, Cl^- and Ca^(2+) removals were very effective as more than 98% of removal rates. Therefore, this indicates that the application of the reuse of treated water by advanced treatment system the existing system plus the membrance process is feasible.
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노재순(Jae Soon Noh),김상구(Sang Goo Kim),류재익(Jae Ick Ryu) 한국수처리학회 1994 한국수처리학회지 Vol.2 No.1
The investitgation for distribution and classification of algae was carried out at four sampling sites-Hanam, Samrangjin, Mulgum and Gupo in the downstream of Nakeong river. Production of algae depend on the factors of the water environment such as temperature, flow rate regardless of nutrient concentration and the aspect of algae growth was classified by four steps. The concentration of chlorphill-a per unit cell could be calculated by emperical equation obtained from this research. Average Percentages of Diatom, Green, Blue Green of total algae were 61.6%, 30.1% and 7.6% respectively and dominant algae species were Cyclotella, Melosira, Actinastrum, Dictyosphaerium and Anabaena during from, March to December, 1993.
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