• Korean Architects
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• no.1 s.154
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• pp.55-64
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• 1982

• Journal of Korean Society of Water and Wastewater
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• v.35 no.3
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• pp.205-225
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• 2021

Due to the large-scale production and use of synthetic chemicals in industralized countries, various chemicals are found in the aquatic environment, which are often termed as micropollutants. Effluents of municipal wastewater treatment plants (WWTPs) have been identified as one of the major sources of these micropollutants. In this article, the current status of occurrence and removal of micropollutants in WWTPs and their management policies and options in domestic and foregin countries were critically reviewed. A large number of pharmaceuticals, personal care products, and industrial chemicals are found in WWTPs' influent, and are only partially removed by current biological wastewater treatment processes. As a result, some micropollutants are present in WWTPs' effluents, which can negatively affect receiving water quality or drinking water source. To better understand and assess the potential risk of micropollutants, a systematic monitoring framework including advanced analytical tools such as high resolution mass spectrometry and bioanalytical methods is needed. Some Western European countries are taking proactive approach to controlling the micropollutants by upgrading WWTP with enahnced effluent treatment processes. While this enahnced WWTP effluent treatment appears to be a viable option for controlling micropollutant, its implementation requires careful consideration of the technical, economical, political, and cultural issues of all stakeholders.

• Journal of Korean Society of Water and Wastewater
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• v.36 no.2
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• pp.59-79
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• 2022

Conventional wastewater treatment plants (WWTPs) do not fully remove micropollutants. Enhanced treatment of sewage effluents is being considered or implemented in some countries to minimize the discharge of problematic micropollutants from WWTPs. Representative enhanced sewage treatment technologies for micropollutant removal were reviewed, including their current status of research and development. Advanced oxidation processes (AOPs) such as ozonation and UV/H₂O₂ and adsorption processes using powdered (PAC) and granular activated carbon (GAC) were mainly discussed with focusing on process principles for the micropollutant removal, effect of process operation and water matrix factors, and technical and economic feasibility. Pilot- and full-scale studies have shown that ozonation, PAC, and GAC can achieve significant elimination of various micropollutants at economically feasible costs(0.16-0.29 €/m³). Considering the current status of domestic WWTPs, ozonation and PAC were found to be the most feasible options for the enhanced sewage effluent treatment. Although ozonation and PAC are all mature technologies, a range of technical aspects should be considered for their successful application, such as energy consumption, CO₂ emission, byproduct or waste generation, and ease of system construction/operation/maintenance. More feasibility studies considering domestic wastewater characteristics and WWTP conditions are required to apply ozonation or PAC/GAC adsorption process to enhance sewage effluent treatment in Korea.

• The Journal of the Korea Contents Association
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• v.20 no.11
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• pp.525-533
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• 2020

The purpose of this study is to analyze how the ten-week complex exercise program for obese postpartum women affects their metabolic syndrome related risk factors (HDL-C, TG, Glucose, blood pressure, and waist circumference) and adipocytokines (Leptin and Adiponectin). The study subjects were 14 women who passed less than 40 months after their child birth, among whom seven were assigned to complex exercise group and seven to control group. The complex exercise program consists of rhythm dance aerobic exercise and resistance exercise. It has been performed twice a week for 10 weeks, and 80 minutes for each session. For data analysis, Mann Whitney U-test, Wilcoxon test, Spearman correlation analysis were conducted. As a result, the groups had no difference in all of the metabolic syndrome related risk factors before and after the program. Regarding intra-group difference, the complex exercise group significantly increased HDL-C, and significantly decreased TG, Glucose, and waist circumference, and the control group signfiicantly increased TG and Glucose. According to the analysis on adipocytokines, in terms of intra-group difference, the complex exercise group significantly increased Adiponectin after exercise. With regard to the correlations between metabolic syndrome related risk factors and adipocytokines, HDL-C and Glucose had a correlation with Adiponectin.

• The Journal of the Korea Contents Association
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• v.21 no.12
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• pp.264-274
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• 2021

This study aims to analyze the impact of well-being tourism motivation on quality of life through well-being tourism satisfaction, focusing on wellness mediated effects. Recently, despite the growing number of well-being tourism pursuing wellness, the lack of research has led to a close analysis of the impact of well-being tourism motivation on quality of life through well-being tourism satisfaction. For this study, a total of 236 people who have experienced well-being tours in the metropolitan area were surveyed from May 10 to May 21, 2021. First, well-being tourism motivation has a positive effect on well-being tourism satisfaction. Second, well-being tourism satisfaction has a positive impact on the quality of life. Third, Wellness has a positive indirect effect as a partial mediator between well-being tourism satisfaction and quality of life The implications of this study are to demonstrate the impact of well-being tourism on quality of life using Wellness' mediators This study suggests that wellness tourism plays an important role in improving the quality of life. It was analyzed that well-being tourism had a positive effect on improving the quality of life at a time when the fatigue of daily life was increased due to prolonged COVID-19. In addition, Wellis analyzed that it is an important factor in enhancing the quality of life for well-being tourists. This contributes not only to the academic contribution to the revitalization of well-being tourism, but also to the development of stress improvement routes to improve people's lives nationally.

• Journal of Korean Society of Water and Wastewater
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• v.36 no.2
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• pp.107-119
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• 2022

The frequent detection and occurrence of micropollutants (MPs) in aquatic ecosystems has raised public health concerns worldwide. In this study, the behavior of 50 MPs was investigated in three different domestic wastewater treatment plants (WWTPs). Furthermore, the Kruskal-Wallis test was used to assess the geographical and seasonal variation of MPs in the WWTPs. The results showed that the concentrations of 43 MPs ranged from less than 0.1 to 237.6 ㎍ L^-1, while other seven MPs including 17-ethynylestradiol, 17-estradiol, sulfathiazole, sulfamethazine, clofibric acid, simvastatin, and lovastatin were not detected in all WWTPs. Among the detected MPs, the pharmaceuticals such as metformin, acetaminophen, naproxen, and caffeine were prominent with maximum concentrations of 133.4, 237.6, 71.5, and 107.7 ㎍ L^-1, respectively. Most perfluorinated compounds and nitrosamines were found at trace levels of 1.2 to 55.3 ng L^-1, while the concentration of corrosion inhibitors, preservatives (parabens), and endocrine disruptors ranged from less than 0.1 to 4310.8 ng L^-1. Regardless of the type of biological treatment process such as MLE, A2O, and MBR, the majority of pharmaceuticals (except lincomycin, diclofenac, iopromide, and carbamazepine), parabens (except Methyl paraben), and endocrine disruptors were removed by more than 80%. However, the removal efficiencies of certain MPs such as atrazine, DEET, perfluorinated compounds (except PFHxA), nitrosamines, and corrosion inhibitors were relatively low or their concentration even increased after treatment. The results of statistical analysis reveal that there is no significant geographical difference in the removal efficacy of MPs, but there are temporal seasonal variations in all WWTPs.