Journal of Japan Society on Water Environment最新文献_第5页

Improvement of Analytical Method for Heavy Metals in Sediment by Microwave Digestion 微波消解法测定沉积物中重金属分析方法的改进

Journal of Japan Society on Water Environment Pub Date : 2022-01-01 DOI: 10.2965/jswe.45.171

C. Maruo, Takeshi Watanabe, Toshiaki Tamaki, D. Sano, O. Nishimura

引用次数: 0

Longitudinal Variations in Macroinvertebrate and Periphyton Communities in a Mountain Stream Receiving Mine Drainage: Are Their Changes in Response to Metal Contamination Different? 高山溪流中大型无脊椎动物和周边植物群落的纵向变化:它们对金属污染的响应是否不同?

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.115

Hiroyuki Kagawa, Y. Iwasaki, Hiroshi Kimura, Hironobu Inukai, Keiichi Sasaki, Rui Yasuda, T. Yasutaka, Saburo Yamagata, Yuji Kawamura

{"title":"Longitudinal Variations in Macroinvertebrate and Periphyton Communities in a Mountain Stream Receiving Mine Drainage: Are Their Changes in Response to Metal Contamination Different?","authors":"Hiroyuki Kagawa, Y. Iwasaki, Hiroshi Kimura, Hironobu Inukai, Keiichi Sasaki, Rui Yasuda, T. Yasutaka, Saburo Yamagata, Yuji Kawamura","doi":"10.2965/jswe.44.115","DOIUrl":"https://doi.org/10.2965/jswe.44.115","url":null,"abstract":"We investigated longitudinal variations in metal concentrations and in benthic macroinvertebrate and periphyton communities at 13 sites in the tributaries of the upstream Hida River to assess the ecological impacts of mine drainage. At the sites immediately downstream of the inflow of mine drainage, the concentrations of trace metals such as zinc increased （ e.g., the maximum zinc concentration of 0.94 mg L -1 was observed ） , large reductions in the taxon richness and abundance of macroinvertebrates and in the taxon richness of periphyton were observed, and tolerant taxa （ e.g., chironomids and baetid mayflies, and Achnanthidium diatoms ） , which are known to be present in metal-contaminated rivers, dominated their respective communities. Metal concentrations decreased at the downstream sites, and the macroinvertebrate community composition observed at the most downstream site was similar to those at reference sites. Although the longitudinal variations in the taxon richness and community composition of macroinvertebrates and periphyton were similar in the studied river, we observed some differences such as the markedly increased abundance of periphyton at the sites downstream of the inflow of mine discharge. Thus, the investigaton of multiple biological groups is required for a comprehensive understanding of the ecological impacts of mine drainage on aquatic communities.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"194 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77385798","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 Estimation Accuracy of River Model AIST-SHANEL– For Bisphenol A in the Tama River – 河流模型ist - shanel -对多摩河双酚A估算精度的评价

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.95

Y. Ishikawa, Yumi Komatsubara, Tomomi Eriguchi

引用次数: 0

Comparison of Trend Analysis Estimate and Measured Toxicity in Fish Acute Toxicity Test of Sodium n-Decyl Sulfate 正癸基硫酸钠鱼类急性毒性试验趋势分析、估测与实测毒性比较

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.179

Takeshi Matsuura, M. Ono, N. Yakata, Masanori Seki

{"title":"Comparison of Trend Analysis Estimate and Measured Toxicity in Fish Acute Toxicity Test of Sodium n-Decyl Sulfate","authors":"Takeshi Matsuura, M. Ono, N. Yakata, Masanori Seki","doi":"10.2965/jswe.44.179","DOIUrl":"https://doi.org/10.2965/jswe.44.179","url":null,"abstract":"Recently, it has become possible to select the test concentration range in the fish acute toxicity test using the trend analysis (TA) estimate by a categorical approach, but few studies have been conducted on comparing the TA estimate with the measured toxicity. In this study, we compared the TA estimate[48-h median lethal concentration (LC50)]and the measured toxicity (96-h LC50) of sodium n-decyl sulfate using medaka (Oryzias latipes).Our results indicated that the estimated and experimental values were 310 and 420 mg L, respectively, and the difference was within 1.5 times. Since the alkyl carbon chain length of sodium n-decyl sulfate is outside the range of alkyl carbon chain lengths in existing data, the TA estimate obtained in this study was considered an unreliable extrapolated value. Therefore, there was a concern that the basis for the determination of the concentration range in the definitive test was weak. However, it is considered possible to determine the test concentration in the definitive test with higher accuracy by considering relevant available information (e.g., 96-h LC50 of other fish species) in addition to the TA estimate.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76817328","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

Cultivation of Filtered Anaerobically Digested Sewage Sludge under Light Illumination for Improvement of Fertilizer Quality 光照下过滤厌氧消化污泥培养提高肥料质量

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/JSWE.44.27

Satoshi Suzuki, T. Hidaka, S. Sano, Gen Yoshida, F. Nishimura

{"title":"Cultivation of Filtered Anaerobically Digested Sewage Sludge under Light Illumination for Improvement of Fertilizer Quality","authors":"Satoshi Suzuki, T. Hidaka, S. Sano, Gen Yoshida, F. Nishimura","doi":"10.2965/JSWE.44.27","DOIUrl":"https://doi.org/10.2965/JSWE.44.27","url":null,"abstract":"The anaerobic co-digestion of sewage sludge and various types of organic waste produces digestate, which can be used directly as fertilizer. The cultivation of photosynthetic bacteria with digestate is focused on to improve the fertilizer quality. After eight months of enrichment with artificial culture media from a seed of sewage sludge, the accumulation of Rhodospirillaceae, which are known to be photosynthetic bacteria, was observed, and the detection ratio to the total number of reads was 55% by sequencing. Filtered digestate liquor from the anaerobic digestion of sewage sludge was continuously cultivated under light illumination, with the seeding of the enrichment culture only at the beginning. The cultivated liquor had a higher pufM gene copy number, which is an indicator of photosynthetic bacteria. Pot experiments showed that grown komatsuna （ Brassica rapa var. perviridis ） had significantly higher （ t-test, p < 0.05 ） fresh weight and ratios of chlorophyll and carotenoid. These results confirmed that the cultivation of filtered digestate liquor under light illumination improves the fertilizer quality. On the other hand, the cultivation of digestate by the anaerobic digestion of sewage sludge under light illumination with the seeding of the enrichment culture only at the beginning resulted in no significant difference in pot experiments. This showed that the cultivation of filtered digestate liquor under light illumination is practical.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84536190","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

Estimation of Filtration Behavior Based on Simplified Evaluation of Membrane Fouling Characteristics 基于膜污染特性简化评价的过滤行为评价

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.149

N. Katagiri, Taisei Shinoda, Reina Yamashita, Shoya Fukuchi

引用次数: 0

Universality of Gluconate as a Hydrogen Donor for Reductive Dechlorination of Chloroethenes 葡萄糖酸盐作为氯乙烯还原脱氯氢供体的普遍性

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.69

Yuta Fujii, K. Mitsuka, Hiroki Ogata, D. Inoue, M. Ike

引用次数: 0

Current Status and Issues of Microplastic Pollution Research 微塑料污染研究现状与问题

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/JSWE.44.35

Yoshiomi Otsuka, H. Takada, Y. Nihei, Y. Kameda, K. Nishikawa

{"title":"Current Status and Issues of Microplastic Pollution Research","authors":"Yoshiomi Otsuka, H. Takada, Y. Nihei, Y. Kameda, K. Nishikawa","doi":"10.2965/JSWE.44.35","DOIUrl":"https://doi.org/10.2965/JSWE.44.35","url":null,"abstract":"We reviewed the environmental impacts of microplastics, discussed the dynamics of microplastics in the aquatic environment and their impacts on marine ecosystems, and introduced the latest analytical methods for microplastics, especially for samples with small particle sizes. Regarding the situation of microplastics in land areas and rivers, the numerical and mass concentrations of microplastics in rivers all over Japan and the estimated total amount of plastics discharged from Japan’s land areas to the ocean were determined. Regarding the state of microplastics in the sea, the dynamics of microplastics in Tokyo Bay and the uptake of microplastics by marine life were determined. For the analysis of microplastics, the methods of sampling, pretreatment, and equipment measurement and their ploblems were summarized, and a technical perspective was presented. It is essential to clarify the dynamics of microplastics in the environment and their impact on ecosystems in order to plan effective and efficient measures for the proper use and management of plastics in the social system. We hope that the information introduced in this paper will contribute to these activities.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76035282","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: 3

Impact of Nutrient Reduction on Organic Matter (COD and TOC) in Coastal Seas 营养物减少对近岸海域有机物(COD和TOC)的影响

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/jswe.44.135

T. Fujiwara, Motoharu Suzuki, Kei Okubo, K. Nagao

引用次数: 0

Distribution and Seasonal Growth of the Invasive Diatom Cymbella janischii in Tamagawa River System 玉川河水系入侵硅藻小银藻的分布及季节生长

Journal of Japan Society on Water Environment Pub Date : 2021-01-01 DOI: 10.2965/JSWE.44.51

Y. Ishii, Tatsuhiko Masuda, H. Ando, Takashi Yamasaki, H. Kiyosawa

引用次数: 0