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미세플라스틱 분리를 위한 미세기포 부상공정에서 개체군수지를 이용한 초기 부착 계수 및 부상특성의 평가
정흥조 ( Heung Joe Jung ),이재욱 ( Jae Wook Lee ),곽동희 ( Dong Heui Kwak ) 한국물환경학회 2021 한국물환경학회지 Vol.37 No.1
In the flotation process to remove microplastic (MP) particles, the attachment and separation efficiency is determined by the basic physicochemical characteristics of MP particles as well as bubbles. To evaluate the flotation characteristics of MP particles, we carried out a series of simulations using the population balance (PB) model. The initial attachment coefficient (α<sub>o</sub>) of MP particles was in the range of 0.2-0.275, and it was slightly lower than that of typical particles, such as clay, debris and algae particles, which exist in water bodies, α<sub>o</sub>, 0.3-0.4. The relative bubble number (RBN) attached to the surface of the typical number of bubbles was 0.30 and 0.32 for MP 30 μm and MP 58 μ m, respectively. In comparison, the RBN of larger MP particles (138 μm) was as high as 0.53. Furthermore, smaller microbubbles were required to separate properly or additional treatment needed to be applied to enhance collision and attachment efficiency since the flotation of MP particles was found to be difficult to treat as high-rate. As a result of comparing the removal rate (experimental value) of MP particles obtained from the batch-type flotation apparatus and the flotation removal rate (predicted value) of MP obtained through the PB model, the final particles by the particle size of MP overall except for the initial separation time area. With respect to the removal efficiency, the observed and predicted values were similar, and it was confirmed that the floating separation characteristics and evaluation of the MP particles through the PB model could be possible.
개체군수지 모델을 이용한 기포와 다공성 탄소의 충돌 및 부상 효율 평가
정흥조 ( Heung-joe Jung ),이재욱 ( Jae-wook Lee ) 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.6
In this work, porous carbons with high surface area were prepared from giant Miscanthus through simple carbonization and activation processes. Adsorption equilibrium and kinetic data of methylene blue on the prepared carbon samples were well fitted with isotherm and kinetic models. On the other hand, the removal efficiency of porous carbons in DAF (dissolved air flotation) was evaluated based on the population balance model. Results showed that the zeta potential was highly sensitive depending on the water properties and coagulation conditions. It was also found that the collision efficiency of bubble-carbon particles in terms of zeta potential was successfully simulated by the employed population balance model.
분리기술 열역학 : 활성탄에 대한 말토올리고당의 흡착평형
이재욱(Jae Wook Lee),정흥조(Heung Joe Jung),문희(Hee Moon),문일식(Il Shik Moon) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.6
Adsorption equilibrium of maltooligosaccharides on activated carbon was studied as a separation and purification method for maltooligosaccharides dissolved in aqueous solutions. Single-species isotherms were represented by the Langmuir, Freundlich and Sips equations and multicomponent equilibria were predicted by extended Langmuir isotherm(ELI), extended Langmuir-Freundlich isotherm(ELFI), and ideal adsorbed solution theory(IAST).