Journal of Japan Society on Water Environment最新文献_第6页

Arsenic Pollution in Nagae River after Volcanic Eruption of Mt. Iou 柳山火山喷发后长江河的砷污染

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/JSWE.44.43

Chikahide Komura, T. Hama, Yukihiro Ichinose, T. Kubota

{"title":"Arsenic Pollution in Nagae River after Volcanic Eruption of Mt. Iou","authors":"Chikahide Komura, T. Hama, Yukihiro Ichinose, T. Kubota","doi":"10.2965/JSWE.44.43","DOIUrl":"https://doi.org/10.2965/JSWE.44.43","url":null,"abstract":"The water quality of the river basins situated in volcanic areas and exposed to volcanic activity can be affected by the acidic water, resulting in the pollution of surface water. On April 19th, 2018, the first eruption in 250 years of Mt. Iou, one of the Kirishima volcanos, caused the discharge of mud and acidic water into the Nagae River, contaminating the water with arsenic at a high concentration that exceeded the environmental standard （ 10 µg L -1 ） . In this study, we investigated the changes in arsenic concentration in the streamflow process, the relationship between pH and Electrical Conductivity （ EC ） , and the runoff characteristics through a continuous observation. The results indicate that the river water was diluted and improved during the streamflow process owing to dilution as a result of influx of water from tributaries, the arsenic concentration has a correlation with pH and EC, particularly, in the upstream area and on nonrainy days, and the arsenic concentration correlates with iron, aluminum, and manganese concentrations. Consequently, arsenic accumulates at the bottom of the riverbed on nonrainy days, and its concentration becomes high owing to the resuspension of the river sediment on rainy days.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"86 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82347515","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: 2

Effect of Multilayered Structure of Filtration Beds on Sewage Treatment Performance in a Multistage Constructed Wetland 多层过滤床结构对多级人工湿地污水处理性能的影响

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.85

Tasuku Suzuki, T. Taniguchi, K. Nakano

{"title":"Effect of Multilayered Structure of Filtration Beds on Sewage Treatment Performance in a Multistage Constructed Wetland","authors":"Tasuku Suzuki, T. Taniguchi, K. Nakano","doi":"10.2965/jswe.44.85","DOIUrl":"https://doi.org/10.2965/jswe.44.85","url":null,"abstract":"In this research, the performance characteristics of the multilayered filtration bed （ MLF ） and non-multilayered filtration bed （ n-MLF ） in a pilot-scale multistage constructed wetland for treating sewage were compared, and the effect of the multilayered structure on the water purification performance was elucidated. It was confirmed that the effect of the multilayered structure on the aerated treatment performance of, for example, BOD and NH 4+ -N removal was negligible under the vertical flow condition, but not under the hybrid condition comprising both vertical and horizontal flows. MLF was easier to become anaerated than n-MLF, resulting in a lower aerated treatment performance under the hybrid condition. Furthermore, the effect of a lack of vegetation on MLF manifested as a lower nitrogen removal performance. Although the specific removal unit for BOD and phosphorus under the vertical flow condition in MLF increased 1.5fold compared with that in n-MLF, the removal performance of nitrogen could not be improved. The specific energy consumption for sewage treatment by the constructed wetland in this work was low at 0.32 kWh m -3 , demonstrating the effectiveness of the constructed wetland in accomplishing the decarbonization of sewage works.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76337038","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

Characteristics of Disinfection By-products in Effluents from Wastewater Treatment Plants in Kyoto City 京都市污水处理厂出水消毒副产物特征

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.103

K. Hosoda, T. Segawa

引用次数: 0

Distribution of Oxygen-Deficient Water and Estimation of Its Area in Lake Kitaura 基图拉湖缺氧水分布及其面积估算

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.157

Shunsuke Komuro, T. Kitamura, Takao Oouchi, E. Masunaga, Daiki Asaoka, K. Ayukawa, Yasuhide Mikami, Y. Seike, Miyuki Yuzawa, T. Fukushima

引用次数: 0

Factor Analysis of Seasonal Fluctuations in Water Quality and Fish Mortality Events within Shallow Eutrophic Water under Freezing Conditions 冻结条件下浅层富营养化水体水质季节波动及鱼类死亡事件的因子分析

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.165

Morio Tsuji, Masaki Suzuki

{"title":"Factor Analysis of Seasonal Fluctuations in Water Quality and Fish Mortality Events within Shallow Eutrophic Water under Freezing Conditions","authors":"Morio Tsuji, Masaki Suzuki","doi":"10.2965/jswe.44.165","DOIUrl":"https://doi.org/10.2965/jswe.44.165","url":null,"abstract":"Fish mortality was investigated in a shallow, constantly stored-water-type regulating pond located in a cold region in mid-March 2018 after ice had melted. In general, fish mortality occurs when water temperatures increase; however, in this case, it occured under freezing conditions. In this study, we attempted to understand the actual water quality by referring to the results of water quality surveys conducted throughout the year and the factors leading to the accident. The studied pond is eutrophic with treated wastewater. Phytoplankton proliferated during the non-freezing season by consuming nutrients in the treated wastewater, and organic matter derived from the phytoplankton accumulated as bottom mud. In early March 2018, the dissolved oxygen (DO) concentration in the bottom layer was almost 0 mg L, while it was also under 1.2 mg L in the upper layer. Concurrently, NH4-N leached out from the reduced bottom mud, and its concentration in the bottom layer increased to 25.4 mg L. The pH of the bottom layer increased to 8.96, and the free ammonia concentration was estimated to be about 3.0 mg L. These results indicate that the low DO and elevated NH4-N concentrations under freezing conditions directly caused this fish mortality incident.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87515801","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

Relationship between Potassium Permanganate Consumption and Total Organic Carbon in Bath Water in Public Bathhouses and Similar Facilities 公共澡堂及类似设施洗澡水中高锰酸钾用量与总有机碳的关系

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.175

Akira Oshima

引用次数: 0

Developing a Method of Detecting Cyanamide and Monitoring Its Concentrations in Rivers in Osaka 大阪市河流中氰胺检测及浓度监测方法的建立

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/JSWE.44.9

J. Ono, Koji Ito, Shigeru Suzuki, Y. Yabuki

引用次数: 0

Prediction of Urban Non-point Pollution Load by Statistical Analysis of Data of Published Research and Its Reliability Evaluation –Statistical Analysis of Mean Load and Verification and Modification of Previously Proposed Model Using Newly Obtained Data– 基于已发表研究数据统计分析的城市非点源污染负荷预测及其可靠性评价——平均负荷统计分析及新数据对原有模型的验证与修正

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/JSWE.44.1

N. Ozaki, K. Wada, M. Murakami, F. Nakajima, H. Furumai

{"title":"Prediction of Urban Non-point Pollution Load by Statistical Analysis of Data of Published Research and Its Reliability Evaluation –Statistical Analysis of Mean Load and Verification and Modification of Previously Proposed Model Using Newly Obtained Data–","authors":"N. Ozaki, K. Wada, M. Murakami, F. Nakajima, H. Furumai","doi":"10.2965/JSWE.44.1","DOIUrl":"https://doi.org/10.2965/JSWE.44.1","url":null,"abstract":"To verify a statistical model for predicting urban pollutant runoff developed in our previous research, newly obtained runoff data were compared with those predicted by the model. The proposed model previously was a regression model using parameters representing geological, rainfall, and hydrological characteristics. The targeted pollutants were COD, SS, TN, and TP, and their event mean concentrations (EMCs) for each rainfall were predicted. From the comparison, the model was found to predict the EMC to one order of magnitude. Moreover, the yearly mean EMC was evaluated from only the mean and standard deviation of all data for each index. The error ratio of the prediction of the mean of 50 rainfall events was within 50%. Furthermore, in order to consider the possible differences among different catchment areas, the EMC values for three catchment areas newly obtained were compared statistically with nationwide values obtained previously. Significant differences were found for one area out of the three which thus emphasizes the importance of the consideration of catchment area differences. Thereafter, the number of runoff samples in a specific watershed area required to detect the mean EMC difference from the nationwide database was derived statistically. This number was calculated to be 10 at most for detecting more than double or less than half of the database means. Lastly, a modified model that includes watershed area differences using a generalized linear mixed model was proposed.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85058620","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: 1

Trial Operation of Water-quality Forecasting System Based on Fecal Pollution Indicators for a Beach in Odaiba Marine Park 基于粪便污染指标的台场海洋公园某海滩水质预报系统试运行

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/JSWE.44.59

Chizuru Kitayama, Kenji Morita, H. Fukuchi, SungAe Lee, H. Furumai

{"title":"Trial Operation of Water-quality Forecasting System Based on Fecal Pollution Indicators for a Beach in Odaiba Marine Park","authors":"Chizuru Kitayama, Kenji Morita, H. Fukuchi, SungAe Lee, H. Furumai","doi":"10.2965/JSWE.44.59","DOIUrl":"https://doi.org/10.2965/JSWE.44.59","url":null,"abstract":"Fecal pollution caused by combined sewer overflows has been observed at urban waterfronts after rainfall and results in fecal pollution levels exceeding bathing water quality standards. To guarantee the swimmablility of urban waterfronts, it is necessary to predict the situation of fecal contamination to ensure safe bathing. Therefore, we aimed to develop a water-quality forecasting system for the beach in Odaiba Marine Park using Escherichia coli as a fecal indictor to determine whether people can submerge their faces in the seawater on the day of bathing. First, rainfall events in the 23 cities of Tokyo over the past 10 years were categorized by cluster analysis, considering their temporospatial distribution characteristics. Then, E. coli concentration changes in the park were calculated using a 3D hydrodynamic and water-quality model for each categorized rainfall group. Using the calculation results for various tidal conditions, we constructed a database of E. coli concentration changes. It was confirmed that the E. coli concentration predicted using the database for a corresponding rainfall group agrees with the concentration peak calculated using the model within a safe margin. Using the constructed database, we carried out a trial operation of the water-quality forecasting system for the beach in 2018 and verified its effectiveness.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84324638","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

Impact of Nutrient Reduction on Organic Matter (COD and TOC) in Coastal Embayments: Effect of the Reduction and Its Working Mechanism 营养物减量对海岸带有机物(COD和TOC)的影响:减量效应及其工作机制

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.185

T. Fujiwara, Motoharu Suzuki, Kei Okubo

{"title":"Impact of Nutrient Reduction on Organic Matter (COD and TOC) in Coastal Embayments: Effect of the Reduction and Its Working Mechanism","authors":"T. Fujiwara, Motoharu Suzuki, Kei Okubo","doi":"10.2965/jswe.44.185","DOIUrl":"https://doi.org/10.2965/jswe.44.185","url":null,"abstract":"Because of the reduction of nutrients in marine areas nationwide, the rates of achieving total nitrogen （ TN ） and total phosphorus （ TP ） water quality standards have reached 96% and 95%, respectively. Nevertheless, the achievement rate of the chemical oxygen demand （ COD ） standard has remained almost unchanged over the last 30 years. The cause of this discrepancy was investigated in Osaka Bay and the following was found. Eutrophication measures such as “TN reduction to suppress the occurrence of high-concentration phytoplankton blooms （ red tide ） ” are working effectively. This was seen in the water quality indicators associated with particulate organic matter. In contrast, the amount of dissolved organic matter has not decreased. The reduction of nutrients has resulted in a rise in the C: N ratio of organic matter, caused by the constancy of the organic carbon concentration and the decrease in organic nitrogen concentration. A discrepancy between COD and TOC trends has also occurred. It was common to Tokyo Bay and Ise Bay that COD has not decreased because nutrient reduction induces a change in the quality of organic matter.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75436595","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: 1