Journal of Korean Society of Water Science and Technology最新文献

Optimal Operational Method and Performance Evaluation of Continuous Inflow Intermittent Explosion Process in Full-Scale Sewage Treatment Plant 大型污水处理厂连续入流间歇爆炸工艺优化运行方法及性能评价

Journal of Korean Society of Water Science and Technology Pub Date : 2023-10-31 DOI: 10.17640/kswst.2023.31.5.249

Yong-ja Jeong, Yun-Seong Choi, Seung-Hwan Lee

{"title":"Optimal Operational Method and Performance Evaluation of Continuous Inflow Intermittent Explosion Process in Full-Scale Sewage Treatment Plant","authors":"Yong-ja Jeong, Yun-Seong Choi, Seung-Hwan Lee","doi":"10.17640/kswst.2023.31.5.249","DOIUrl":"https://doi.org/10.17640/kswst.2023.31.5.249","url":null,"abstract":"The intermittent cycle extended aeration system (ICEAS), a modified version of the Sequencing batch reactor (SBR) process, allows continuous wastewater inflow during a single-reactor operation. This system addresses the limitations of the standard SBR process, including the need for sedimentation tanks and sludge return systems and their susceptibility to shock loads. While maintaining simplicity in facility design, the ICEAS process addresses the challenge of achieving continuous inflow and outflow of wastewater. In this study, the performance and critical functions of a full-scale wastewater treatment facility with a capacity of 2,150 m³/day were primarily examined using the improved ICEAS process. The study focused on determining the optimal operating range based on standard parameters in biological reactors, such as MLSS, SRT, DO, sedimentation indices (SV30, SVI, SDI), and advanced treatment ratios (C/N ratio and C/P ratio). The obtained results were applied to the target facility from January 2020 to December 2022. Predictive modeling and operational modes were developed to handle scenarios encountered in real wastewater treatment plants, including fluctuations in influent concentration and flow, rainy weather conditions, and seasonal operations. These measures ensured stable water quality management and compliance with effluent quality regulations.","PeriodicalId":493812,"journal":{"name":"Journal of Korean Society of Water Science and Technology","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135978759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Study on Optimization of the Preparation of Pellet Activated Carbon by Phase Separation Method 相分离法制备颗粒活性炭的优化研究

Journal of Korean Society of Water Science and Technology Pub Date : 2023-10-31 DOI: 10.17640/kswst.2023.31.5.243

Hye-Seon Yoo, In-Seol Yeo, Chan-Gyu Park

{"title":"A Study on Optimization of the Preparation of Pellet Activated Carbon by Phase Separation Method","authors":"Hye-Seon Yoo, In-Seol Yeo, Chan-Gyu Park","doi":"10.17640/kswst.2023.31.5.243","DOIUrl":"https://doi.org/10.17640/kswst.2023.31.5.243","url":null,"abstract":"Activated carbon has a high absorption capacity. Hence, it is utilized in the treatment process of environmental pollutants, causing the consumption of activated carbon in Korea to increase. However, powdered activated carbon (PAC) is required to be molded into granular activated carbon (GAC) due to difficulties when being applied in processes and industries. In this study, three different PACs were molded into pellet activated carbon using the phase separation method: coconut-based, coal-based, and wood-based. The PACs were made by 10wt% PES, 16wt% PES, 27wt% PES, and 35wt% PES because the formation in the phase separation method depends on the ratio of binder, polar solvent, and non-solvent. 16wt% PES coal-based PAC had the best absorbency, while 35wt% PES coal-based PAC had the lowest absorbency. In addition, the economies were determined in the order of 16wt% PES, 10wt% PES, 35wt% PES, and 27wt% PES. Finally, considering the methylene blue adsorption capacity and economic feasibility evaluation, the following efficiency order of PACs was evaluated: 16wt% PES coal-based PAC, 27wt% PES wood-based PAC, 35wt% PES wood-based PAC, 16wt% PES coconut shell-based PAC, and 27wt% PES coal-based PAC.","PeriodicalId":493812,"journal":{"name":"Journal of Korean Society of Water Science and Technology","volume":"16 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135978970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Study on the Actual State of Sewage Supply in Myon Area with a Declining Population 人口下降的密阳地区污水供应现状研究

Journal of Korean Society of Water Science and Technology Pub Date : 2023-10-31 DOI: 10.17640/kswst.2023.31.5.261

Jung-In Suh, Eun-Hye Kim

{"title":"A Study on the Actual State of Sewage Supply in Myon Area with a Declining Population","authors":"Jung-In Suh, Eun-Hye Kim","doi":"10.17640/kswst.2023.31.5.261","DOIUrl":"https://doi.org/10.17640/kswst.2023.31.5.261","url":null,"abstract":"In this study, we investigated the actual situation of sewage facilities in the Myon area in order to obtain the basic information necessary for establishing a sewerage development plan in areas where the population is decreasing. The phenomenon of population decline was found to be more pronounced in the Myon area than in the Eup area. Although the average operation rate of sewage treatment facilities in these areas has increased slightly, there are many places where the operation rate is increasing even though there are no factors that will increase the inflow. Hence, the possibility of an inflow of unknown water is high. In addition, the population density in the sewage treatment area in the Myon area has been continuously decreasing, and the length of sewer pipes per person is also increasing. Therefore, it is predicted that maintenance of the facility will be difficult in the future. Additionally, 74% of the sewage generated in the Myon area is treated at private sewage treatment facilities. Moreover, as a result of analyzing the efficiency of public sewage treatment facilities using data envelopment analysis, approximately 50% were found to be inefficient in terms of facility capacity and operation. Considering the situation in the Myon area, it is believed that a change in perception of public and private sewage treatment facilities is necessary when establishing a sewerage maintenance plan for areas with a declining population.","PeriodicalId":493812,"journal":{"name":"Journal of Korean Society of Water Science and Technology","volume":"13 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135978765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Upflow Biological Aerated Filter as a Alternative of Rapid Sand Filter in Advanced Water Treatment System 上流式曝气生物滤池替代快速砂滤池在高级水处理系统中的应用效果

Journal of Korean Society of Water Science and Technology Pub Date : 2023-10-31 DOI: 10.17640/kswst.2023.31.5.225

Yong-Tae Kang, Kil-Soo Hyun

{"title":"Effect of Upflow Biological Aerated Filter as a Alternative of Rapid Sand Filter in Advanced Water Treatment System","authors":"Yong-Tae Kang, Kil-Soo Hyun","doi":"10.17640/kswst.2023.31.5.225","DOIUrl":"https://doi.org/10.17640/kswst.2023.31.5.225","url":null,"abstract":"Given the deteriorated water quality in rivers that are used as sources of drinking water, the performance of existing filtration processes must be improved. In particular, the inefficiency of rapid sand filters prior to the post-ozonation process of the advanced water treatment system (AWTS) in reducing organic matter has resulted in the introduction of more effective processes. Downflow biofilm aerated filters (BAFs) are an alternative to rapid sand filters in drinking water treatment plants and were introduced to investigate their characteristics for removing particulate and organic matter in river water used as a drinking water source. In this study, zeocarbon was employed as the filter media in the BAF, which was packed to a thickness of 3 m. The filtration velocity ranged from 90 to 100 m/d, and Nakdong river water was used as the raw water. The results indicated that the removal efficiencies of UV254, dissolved organic carbon (DOC), trehalomethan formation potential (THMFP), KMnO4 consumption, DOC, and color ranged from 80% to 85%. In addition, the removal efficiency of NH4+-N ranged from 70% to 85%. Moreover, column-shaped filter media achieved 10%-20% higher efficiency than ball-shaped media. The results indicate that the BAF process is a suitable alternative to rapid sand filters.","PeriodicalId":493812,"journal":{"name":"Journal of Korean Society of Water Science and Technology","volume":"13 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135978767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Sentiment Index for Water Quality Satisfaction using Web Crawling 基于网络抓取的水质满意度情绪指数分析

Journal of Korean Society of Water Science and Technology Pub Date : 2023-10-31 DOI: 10.17640/kswst.2023.31.5.233

Juwon Lee, Yongjun Choi, Sookhyun Nam, Eunju Kim, Yonghyun Shin, Tae-Mun Hwang

{"title":"Analysis of Sentiment Index for Water Quality Satisfaction using Web Crawling","authors":"Juwon Lee, Yongjun Choi, Sookhyun Nam, Eunju Kim, Yonghyun Shin, Tae-Mun Hwang","doi":"10.17640/kswst.2023.31.5.233","DOIUrl":"https://doi.org/10.17640/kswst.2023.31.5.233","url":null,"abstract":"Owing to recent water accidents, consumers' distrust of tap water and their reluctance to use it have continued. Accordingly, in this study, we analyzed tap water-related data mentioned on social media before and after water quality accidents (red-colored water and larvae issues) to identify consumers' perceptions. To achieve this, a database was built for the data collected through web crawling, and a three-stage customized sentiment lexicon was created: positive, negative, and neutral. Sentiment analysis was then performed using the manufactured sentiment lexicon, and the emotional index was evaluated to predict satisfaction with tap water by calculating the ratio of positive, negative, and neutral words from the analysis results. In the case of red water, the average values of the emotional index before and after the occurrence were calculated as 77.6 and 73.5, respectively, and the lowest value at the time of the event of red water was 59.76, which was lower than the average. For the case of larvae, it was confirmed that the average value before and after the accident was 82.2, and the lowest value during the occurrence period was 58.74. According to these results, it would be possible to monitor any changes in the emotional index value and identify events early in the case of an outlier. In this respect, a method of using the analyzed emotional index as an evaluation index for satisfaction was proposed. If this evaluation technology is reflected in the survey methodology, it is expected that it could be used as an effective countermeasure to respond quickly in an accident and improve citizens' satisfaction with tap water.","PeriodicalId":493812,"journal":{"name":"Journal of Korean Society of Water Science and Technology","volume":"54 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135978768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of Bromide removal with Seasonal Level in the Processes of Advanced Water Treatment System 深度水处理系统过程中随季节变化的溴化物去除效果评价

Journal of Korean Society of Water Science and Technology Pub Date : 2023-10-31 DOI: 10.17640/kswst.2023.31.5.271

Kil-Soo Hyun

{"title":"Evaluation of Bromide removal with Seasonal Level in the Processes of Advanced Water Treatment System","authors":"Kil-Soo Hyun","doi":"10.17640/kswst.2023.31.5.271","DOIUrl":"https://doi.org/10.17640/kswst.2023.31.5.271","url":null,"abstract":"As the bromide (Br-) containing water is used in drinking water treatment, the most major concern is the formation of brominated disinfection by-products (Br-DBPs). Among them, bromate (BrO3-) has been well proved to be more carcinogenic and mutagenic than other analogues. In this study, batch and continuous experiments were conducted to investigate the factors that influence the seasonal distribution and formation of bromate and bromide in the Nakdong River, which is used as a drinking water source. In addition, the behaviors of bromate and bromide as ozonation by-products (OBPs) in the processes of drinking water treatment systems were investigated. The mean influent concentrations were 3.1±0.7 mg/L for dissolved organic carbon (DOC) and 58.6±31.5 ug/L for bromide. As a result, bromide levels in the Nakdong River increased with decreasing water flow rate and decreasing water temperature. In pre- and post-ozonation, the concentration of OBPs increased with increasing bromide level, ozone dosage, and pH value. In particular, the concentration of OBPs forming in both pre-ozonation and winter was relatively higher than in both post-ozonation and summer. In terms of coagulation and sedimentation, polyaluminum sulfate organic magnesium (PASOM) coagulation resulted in slightly less OBP removal than polyaluminum silicate chloride (PASCl) coagulation. Moreover, bromate was effectively reduced in a three-month-old biological activated carbon filter.","PeriodicalId":493812,"journal":{"name":"Journal of Korean Society of Water Science and Technology","volume":"42 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135978965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Features of Recovery and Precipitation of Lanthanum with Temperature Change 镧的回收和沉淀随温度变化的特征

Journal of Korean Society of Water Science and Technology Pub Date : 2023-04-30 DOI: 10.17640/kswst.2023.31.2.71

Su-Gyeong Jeon, Dong-Su Kim

{"title":"Features of Recovery and Precipitation of Lanthanum with Temperature Change","authors":"Su-Gyeong Jeon, Dong-Su Kim","doi":"10.17640/kswst.2023.31.2.71","DOIUrl":"https://doi.org/10.17640/kswst.2023.31.2.71","url":null,"abstract":"In order to determine the influences of temperature on the recovery and precipitation of Lanthanum, a Pourbaix diagram was constructed using thermodynamic calculations for 283 K, 298 K, 313 K, and 328 K. In terms of the reduction potential of La3+, when {La3+} is 100, the potential increases from -2.381 V to - 2.369 V as the temperature increases from 283 K to 328 K, but when {La3+} is 10-6, it decreases from - 2.493 V to -2.500 V. The pH of precipitation of La(OH)3 decreases as the temperature rises. The pH decreases from 7.58 to 6.25 and from 9.58 to 8.25 when {La3+} is 100 and 10-6, respectively. Based on these changes in the potential and pH, it is considered that the pH has a greater effect on the stable area of La3+ than dose the reduction potential of La3+. Overall, with an increase in temperature, the stable area of La3+ decreases while that of La(OH)3 increases. When {La3+} is 10-6, as the temperature rises, the stable area of La3+ decreases to 95.0%, 90.4%, and 86.3% of the area at 283 K. However, as the temperature decreases, the stable area of La(OH)3 falls to 92.6%, 84.5%, and 75.7% of the stable area at 328 K. This means that an increase in temperature can reduce the efficiency of the recovery and precipitation process of La3+ while increasing the efficiency of the precipitate treatment of La(OH)3.","PeriodicalId":493812,"journal":{"name":"Journal of Korean Society of Water Science and Technology","volume":"242 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135713384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reuse Potential of the Secondary Effluent from a Wastewater Treatment Plant 污水处理厂二级流出物的再利用潜力

Journal of Korean Society of Water Science and Technology Pub Date : 2023-04-30 DOI: 10.17640/kswst.2023.31.2.79

Ji-Yeon Kim

引用次数: 0

Performance and Factors Evaluation of a Full-scale Biofiltration Process for Wastewater Treatment 污水处理全规模生物过滤工艺的性能及影响因素评价

Journal of Korean Society of Water Science and Technology Pub Date : 2023-04-30 DOI: 10.17640/kswst.2023.31.2.87

Jae-Young Yoo, Seung-Hwan Lee

{"title":"Performance and Factors Evaluation of a Full-scale Biofiltration Process for Wastewater Treatment","authors":"Jae-Young Yoo, Seung-Hwan Lee","doi":"10.17640/kswst.2023.31.2.87","DOIUrl":"https://doi.org/10.17640/kswst.2023.31.2.87","url":null,"abstract":"The H sewage treatment facility built in 2016 as the main treatment biofiltration (BF) process has encountered difficulties in attaining a sufficient and effluent quality. For this reason, the factors affecting effluent quality were monitored in the present study. Based on suspended solids (SS) analysis, it was found that the stable management of primary sedimentation tank played an important role in ensuring the quality of the effluent water. Polyaluminum chloride (PAC) loadings and the sludge removal rate also found to be key operating factors affecting the effluent water quality. With an increase in turbidity caused by variation in the influent rate, most of the water quality parameters, including SS, total phosphorus, biological oxygen demand, and total organic carbon, proportionally increased in the effluent water. Turbidity was identified as the factor directly influencing the stable operation of the BF process. In a theoretical 100% index operational simulation test, stable nitrification, denitrification, and SS removal rates were achieved. Overall, the most influential factor for the quality of the water discharged from the full-scale sewage treatment plant was found to be the temperature. Continuous monitoring of the BF process to handle changes in the flow rate and water temperature is necessary to ensure a stable water quality. In addition, the activated sludge process exhibited more stable operating characteristics with a biofilter than without one.","PeriodicalId":493812,"journal":{"name":"Journal of Korean Society of Water Science and Technology","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135713385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of the Effect of an Upflow Biofilter on the Enhancement of Influent Quality for a Water Treatment Plant 上流式生物滤池对水处理厂进水水质改善效果的评价

Journal of Korean Society of Water Science and Technology Pub Date : 2023-04-30 DOI: 10.17640/kswst.2023.31.2.65

Yong-Tae Kang, Kil-Soo Hyun

{"title":"Evaluation of the Effect of an Upflow Biofilter on the Enhancement of Influent Quality for a Water Treatment Plant","authors":"Yong-Tae Kang, Kil-Soo Hyun","doi":"10.17640/kswst.2023.31.2.65","DOIUrl":"https://doi.org/10.17640/kswst.2023.31.2.65","url":null,"abstract":"The hydraulic characteristics of Nakdong River, which is used as a source of drinking water, are similar to a series of lakes due to the construction of several weirs. This has resulted in the deterioration of the water quality of the river due to the inflow of various pollutants (e.g., organics, nitrogen, phosphorus, and nonbiodegradable matter). The objectives of this research were to evaluate the performance of an upflow biofilter (UBF) packed with zeocarbon in improving the river water quality. As the filtration velocity increased from 100 to 200m/d for the UBF bed, the removal efficiency decreased from 74.5±7.5 to 23.4±2.45% for the chemical oxygen demand, increased from 3.5±6.2 to 55.2±9.0% for suspended solids, increased from 64.8±1.8 to 89.9±1.7% for NH4-N, and decreased from 91.2±2.9 to 60.0±10.2% for E.coli. The removal efficiencies thus decreased with a higher filtration velocity. Despite the fluctuation in the river water quality, a filtration velocity lower than 150 m/d led to a stable treatment performance and produced Grade I river water quality as a source of drinking water. Evaluating the biodegradation rate of the UBF bed using zeocarbon, the results show that the dissolved organic carbon was 0.198 gDOC/kgZCday. In particular, the biodegradation of the UBF after backwashing increased with a lower filtration velocity. These results indicate that the use of UBFs is effective for enhancing river water quality.","PeriodicalId":493812,"journal":{"name":"Journal of Korean Society of Water Science and Technology","volume":"65 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135713386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0