https://scholar.korea.ac.kr/handle/2021.sw.korea/704 2026-04-05T17:26:40Z 2026-04-05T17:26:40Z Kim, Jieun Lee, Daeho Lee, Songbok Lee, Jaewon Choi, Youngkwon Lee, Sangyoup Hwang, Moon-Hyun Boo, Chanhee Kim, Youngjin https://scholar.korea.ac.kr/handle/2021.sw.korea/269541 2025-06-09T09:46:19Z 2025-10-18T00:00:00Z

Title: Isothermal membrane distillation using omniphobic membranes for enhanced ammonia recovery from anaerobic digestion sludge leachate Authors: Kim, Jieun; Lee, Daeho; Lee, Songbok; Lee, Jaewon; Choi, Youngkwon; Lee, Sangyoup; Hwang, Moon-Hyun; Boo, Chanhee; Kim, Youngjin Abstract: Membrane distillation (MD) offers a promising approach for recovering ammonia from wastewater by selectively permeating gaseous ammonia through a hydrophobic porous membrane. However, conventional hydrophobic membranes, such as those made from polyvinylidene fluoride (PVDF), encounter wetting issues when the feed water contains surfactants and low surface tension contaminants. This study demonstrates the fabrication and application of omniphobic MD membranes for the effective recovery of ammonia from anaerobic digestion sludge leachate. The omniphobic MD membrane was developed by spray coating a perfluorinated urethane polymer on a PVDF substrate. Comprehensive membrane characterization confirmed the efficacy of the omniphobic surface coating and its resistance to wetting by both water and low surface tension liquids. The developed omniphobic membrane was employed to evaluate the ammonia recovery from anaerobic digestion leachate using conventional membrane distillation (CMD) and isothermal membrane distillation (IMD) processes. While CMD operation exhibited membrane wetting, fouling, and consequently low ammonia productivity, the omniphobic membrane demonstrated stable and efficient ammonia recovery during IMD operation. In long-term IMD operation, a stable ammonia flux between 18.8 and 20.2 g/m2/h was maintained for 5 days, illustrating the promising potential of omniphobic membranes for recovering high concentration of ammonia from anaerobic digestion sludge leachate. © 2025 Elsevier B.V.

2025-10-18T00:00:00Z Choden, Yeshi Askari, Mohsen Kabir, Mohammad Mahbub Choo, Youngwoo Sabur, Golam Md. Mamun, Md. Fazlul Karim Choi, June-Seok Woo, Yun Chul Kim, Youngjin Hong, Seungkwan Shon, Ho Kyong Phuntsho, Sherub https://scholar.korea.ac.kr/handle/2021.sw.korea/270705 2025-05-28T09:01:45Z 2025-10-15T00:00:00Z

Title: Recovery of bromide for bromine extraction: a review of technologies and circular economy implications Authors: Choden, Yeshi; Askari, Mohsen; Kabir, Mohammad Mahbub; Choo, Youngwoo; Sabur, Golam Md.; Mamun, Md. Fazlul Karim; Choi, June-Seok; Woo, Yun Chul; Kim, Youngjin; Hong, Seungkwan; Shon, Ho Kyong; Phuntsho, Sherub Abstract: Bromine, with its remarkable versatility in industrial applications and significant presence in seawater, plays a crucial role in various sectors including agriculture, healthcare, flame retardants, oil and gas industries, and pharmaceuticals. This review critically evaluates the various technologies for the recovery of bromide to extract elemental bromine, emphasizing their potential for sustainable resource recovery and alignment with circular economy principles. Beginning with an analysis of bromine formation mechanisms and traditional extraction methods, the paper examines current challenges in bromine recovery, including declining traditional resources, energy efficiency concerns, and selectivity issues. It then explores cutting-edge technologies for bromide extraction, considering both recovery and removal, including adsorption methods, membrane separation techniques, and electrochemical processes. The paper also investigates the integration of these technologies within the circular economy frameworks, emphasizing their potential for sustainable resource management and environmental protection. The concluding section discusses prospects, stressing the development of highly selective materials and processing technologies that could enhance extraction efficiency while contributing to circular economy objectives. Through this comprehensive analysis, the review establishes the critical importance of advancing bromine recovery technologies for ensuring sustainable bromine supply and environmental stewardship. This review represents the first in-depth assessment of bromine recovery technologies, connecting current technological advancements to future potential within the circular economy framework. © 2025 The Authors

2025-10-15T00:00:00Z Ban, Min Jeong Kim, Keugtae Kim, Sungpyo Kim, Lan Hee Kang, Joo-Hyon https://scholar.korea.ac.kr/handle/2021.sw.korea/267780 2025-04-01T09:02:18Z 2025-06-15T00:00:00Z

Title: Comparative assessment of sewer sampling methods for infectious disease surveillance: Insights from transport modeling and simulations of SARS-CoV-2 emissions Authors: Ban, Min Jeong; Kim, Keugtae; Kim, Sungpyo; Kim, Lan Hee; Kang, Joo-Hyon Abstract: Emerging infectious diseases like COVID-19 present significant public health challenges, necessitating effective surveillance methods. Wastewater-based epidemiology (WBE), detecting viral pathogens in wastewater, has emerged as a proactive tool for monitoring infections. This study evaluated various wastewter sampling methods through SARS-CoV-2 transport simulations in an urban sewer network in Sejong City, South Korea, to identify cost-effective strategies for accurate infection monitoring. Using the U.S. EPA's Storm Water Management Model (SWMM) and Markov chain Monte Carlo (MCMC) sampling, we simulated wastewater flow and viral concentrations based on reported COVID-19 case data for the year 2021. In this study, we used reported COVID-19 cases as a hypothetical estimate of the number of infected individuals in the simulation. The SWMM effectively replicated daily and monthly patterns in sewer flow rates. Combining the SWMM with MCMC sampling from the probability distributions of spatio-temporal virus emission patterns, we generated an ensemble time series dataset of hourly virus concentrations based on 200 simulations, forming the basis for evaluating sampling alternatives. Results showed a strong correlation (R2 = 0.81) between daily average virus concentrations and daily infection rates on the fifth day following new infections, consistent with simulated viral emission patterns. Flowweighted and equally timed sampling methods provided highly reliable infection pattern estimates, suggesting that equally timed sampling is a cost-effective alternative. In contrast, grab sampling performed poorly due to difficulties in capturing peak viral emission periods. We found that a minimum sampling duration of four to six hours was crucial for accurate detection, with performance increasing if the sampling was applied in the morning (R2 approximate to 0.7). Longer durations steadily, but only slightly, improved results. While this simulation-based approach focused on predicting daily virus concentration patterns in wastewater rather than precisely estimating its absolute levels, it provides valuable insights for optimizing WBE in public health surveillance and underscores the need for further validation with real-world data.

2025-06-15T00:00:00Z Kim, Gyeong-soo Choi, Oh Kyung Kim, Gyu Dong Lee, Jae Woo Kim, Doo-il https://scholar.korea.ac.kr/handle/2021.sw.korea/269362 2025-05-12T09:01:25Z 2025-03-01T00:00:00Z

Title: The effect of temperature, ion valency, and solvent reuse on the solvent extraction desalination Authors: Kim, Gyeong-soo; Choi, Oh Kyung; Kim, Gyu Dong; Lee, Jae Woo; Kim, Doo-il Abstract: This study investigates the performance of solvent extraction desalination (SED) using three amine solvents DPA, DIPA, and DBA under various temperature and ion valency conditions. The results revealed that reaction and separation temperatures significantly influenced water recovery and salt removal efficiencies. DIPA demonstrated the highest water recovery, while DPA exhibited superior salt removal efficiency. Mg(2+)was effectively removed through a precipitation mechanism, distinct from the polarity-driven removal of sodium chloride. Additionally, reuse experiments over nine cycles showed stable performance in water recovery and salt removal, emphasizing the economic and operational feasibility of SED. These findings highlight the adaptability and potential of SED as a membrane-free desalination technology for high-brine scenarios, offering a sustainable alternative for seawater and brine treatment.

2025-03-01T00:00:00Z