Nobutada Nakamoto

Ōtani University

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Co-Authors

Kimio Hirabayashi

Shinshu University

Masuo Yamamoto

Shinshu University

Masashi Sakai

Fujisawa City Hospital

Osamu Mitamura

Shiga University

Kentaro Nozaki

Sugiyama Jogakuen University

Ricardo Barbieri

Universidade Federal do Maranhão

José Policarpo Costa Neto

Universidade Federal do Maranhão

Paulo Roberto Saraiva Cavalcante

Universidade Federal do Maranhão

José Galízia Tundisi

Instituto Internacional de Ecologia (Brazil)

Norio Ogura

Tokyo University of Agriculture and Technology

Cooperative Institutions

Tokyo Metropolitan University

Shinshu University

Yamagata University

Tokyo University of Agriculture and Technology

Tokyo Metropolitan Police Department

Tokyo Metropolitan Government

Kurita Water Industries (Japan)

The University of Tokyo

Universidade Federal do Maranhão

Ōtani University

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C05 Effect of effluence from a sewage treatment plant on river aquatic insects

Medical Entomology and Zoology (2003)

Kimio Hirabayashi Nobutada Nakamoto

10.7601/mez.54.45_1

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Citations (0)

Role of filamentous algae in a slow sand filter

SIL Proceedings 1922-2010 (1994)

Masashi Sakai Nobutada Nakamoto

Segmented filamentous bacteria

10.1080/03680770.1992.11900544

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Citations (9)

The filter clogging of a slow sand filter caused by the flow of Nitzschia holsatica from Sugadaira reservoir

Japanese Journal of Water Treatment Biology (1992)

Kentaro Nozaki Masashi Sakai Nobutada Nakamoto

A heavy filter clogging at a slow sand filter was observed in early July 1992. It was caused by the flow of phytoplankton (Nitzschia holsatica) from a reservoir.N.holsatica under the bloom condition consumed almost all available reactive phosphorus in surface water of the reservoir. And phosphorous concentration in raw water to the slow sand filter decreased in this period. A filamenlous diatom (Melosira varians) which prevented the filter clogging could not grow in the filter pond due to deficient of available phosphorus.

Clogging

Slow sand filter

Sand filter

Raw water

Bloom

10.2521/jswtb.28.2_123

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Citations (0)

Physicochemical Features of Rivers and Lakes in Pantanal Wetland.

Japanese Journal of Limnology (Rikusuigaku Zasshi) (1997)

Yatsuka Saijô Osamu Mitamura Kozo Hino Isao Ikusima José Galízia Tundisi

The Pantanal is one of the largest wetland in the world, and its located almost in the central part of South America. Preliminary studies on the chemical features of waters were carried out in July, 1983 in Rio Paraguai and its tributaries in southern Pantanal, and in January, 1986 for some lakes near Porto Jofre and a river in northern Pantanal. The former showed an extremely oligotrophic character and the latter a eutrophic character, while the nitrogen seemed to be the limiting nutrient rather than phosphorus in both waters. The oxygen deficiency in water seemed rather common throughout the area studied in spite of the difference in water temperature and the organic matter contents.

Limiting

10.3739/rikusui.58.69

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Citations (10)

Dominant Growth of Filamentous Diatom Melosira under Natural Environment in Comparison with a Slow Sand Filter.

Japanese Journal of Water Treatment Biology (1998)

Nobutada Nakamoto Daisuke Ikeda Tomoko Hoshino Masuo Yamamoto

Natural field survey was done to clarify the characteristic environment for a filamentous diatom Melosira to dominate in a slow sand filter. Four natural fields where Melosira was dominated in early spring were observed periodically. There were the basin of Shiraito waterfall at the foot of Mt. Asama, a natural pond of Sato Ike at the foot of Mt. Asama, pools in a dry river bed of River Chikuma where is a lower reach of sewerage plant and a hydroelectric power plant, a small downstream of Karasawa fall, and Soehi stream of a mountain small stream with slow water current as a contrast place where was not observed Melosira. The places where Melosira was observed at always in a year were a basin of Shiraito fall and pools in a dry river bed of River Chikuma. The basin was periodically cleaned to keep a clean basin. The pools were flushed out after the heavy rain and irregularly water discharge from the power plant. Both place are similar to a slow sand filter basin where the surface mud is scraped periodically. Small stream of Karasawa fall was hidden in the grass in summer. There was sometimes a evening shower in the mountain area and there was a sudden high water after a shower. In the pond Sato Ike, filamentous diatom was observed during the low water temperature period from fall tospring. However a filamentous green alga was dominated in summer. Filamentous diatom was apioneer plant in a stable environment with a slow water current and it was replaced tofilamentous green algae in warm period. The cause of this succession was discussed with the grazing activity of aquatic insect larvae.

10.2521/jswtb.34.1

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Citations (2)

Progress in Slow Sand and Alternative Biofiltration Processes

Water Intelligence Online (2014)

Nobutada Nakamoto

This book provides a state-of-the-art assessment on a variety of biofiltration water treatment systems from studies conducted around the world. The authors collectively represent a perspective from 23 countries and include academics/researchers, biofiltration system users, designers, and manufacturers. Progress in Slow Sand and Alternative Biofiltration Processes !! Further Developments and Applications offers technical information and discussion to provide perspective on the biological and physical factors affecting the performance of slow sand filtration and biological filtration processes. Chapters have been submitted from the 5th International Slow Sand and Alternative Biological Filtration Conference, Nagoya, Japan in June 2014. ISBN: 9781780406381 (eBook) ISBN: 9781780406374 (Print)

Biofilter

10.2166/9781780406381

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Citations (26)

Limnological characteristics of three aquatic systems of the pre-amazonian floodplain, Baixada Maranhense (Maranhão, Brazil)

Aquatic Ecosystem Health & Management (2000)

Maria S. R. Ibañez Paulo Roberto Saraiva Cavalcante José Policarpo Costa Neto Ricardo Barbieri Juliana Pontes

Abstract Preliminary information is provided on physical and chemical characteristics of three aquatic systems in the pre-amazonian floodplain, Baixada Maranhense: Pindaré (Viana Lake) and the Pericumã and Turiaçu rivers. Emphasis is given to the nutrients analyzed spectrophotometrically from the bottom sediments of Viana Lake. The water bodies differ from each other with respect to conductivity, total suspended solids and nutrient contents in the water, with higher values (except for total nitrogen) in the dry season. The main factors responsible for such differences, besides the annual flood, are the presence of macrophytes on Pericumã, riparian vegetation on Turiaçu (both systems with lotic characteristics) and water buffalo at Viana Lake. Bottom sediments with low nutrient concentrations at Viana Lake may be due to the rapid mineralization of organic matter in this lentic environment.

Lake ecosystem

River ecosystem

10.1080/14634980008650689

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Citations (3)

Ecological studies on guppy, Lebistes reticulatus Peters, I : Acclimatized guppy in the waters of hot springs in Japan

Medical Entomology and Zoology (1966)

Hiroshi Yamagishi Yuzuru NAKAMURA Yoshitake WADA Tokio Okino Nobutada Nakamoto

わが国の4つの温泉地(蓮台寺, 浅間, 戸倉・上山田, 内郷)において, 温泉廃水を含む水体中に南米原産の胎生魚, グッピーが野生化し, 自然繁殖を続けていることを確認し, 主に戸倉・上山田および蓮台寺でグッピー個体群とその環境についての調査を行つた.グッピーは冬季には温泉廃水の混入する場所のみに生息する.これらの場所の水温は20℃前後に維持されている.戸倉・上山田温泉のこのような場所の一つで, グッピーは冬の終りには非常な高密度に達していた.しかし夏になるとグッピーは温泉の影響の少い農業用水, 水田, 川の岸辺の浅水部などへ広く分散する.この時期には越冬場所の個体数は著るしく減少した.これらのグッピーは下水の混入する汚濁のかなり強いところにも生息しうる.しかし耐寒性はない.グッピーの生長は非常に早く, 産子間隔も短いので, 急速に個体数が増加する.このような性質と強い雑食性によつて, 水田その他の水たまりの蚊幼虫の駆除にグッピーを利用することができる.調査した2つの温泉地の水田にはシナハマダラカとコガタアカイエカの幼虫が極めて少なかつた.

Guppy

Poecilia

10.7601/mez.17.48

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Citations (3)

Inconsiderable Amount of Phytoplankton Leakage by Algal Mat Peeling from a Slow Sand Filter.

Japanese Journal of Water Treatment Biology (1997)

Nobutada Nakamoto Noriyasu IWASE Kentaro Nozaki Masashi Sakai

Heavy algal mat of a filamentous diatom is sometimes observed in an open slow sand filter. Amount of particle leakage breaking through a slow sand filter was measured as an indicator of chlorophyll α concentration in filtrate water during the filter run. Chlorophyll α concentration decreased rapidly since the beginning of filter operation. Chlorophyll α concentration after ll days of filter run reached to inconsiderable amount of 0.005 Chl. α mg m-3. This means the particle concentration breaking through the slow sand filter was negligibly small amount. Algal mat peeling during a continuous culture condition of filamentous diatom does not cause the particle leak through a slow sand filter.

Leakage (economics)

Sand filter

10.2521/jswtb.33.179

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Citations (4)

Fluctuation of dissolved organic carbon in seawater of Sagami Bay during 1971–1972

Journal of Engineering Physics and Thermophysics (1975)

Norio Ogura Akiyoshi Kamatani Nobutada Nakamoto Masaki Funakoshi Shizuo Iwata

Bloom

10.1007/bf02108217

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Citations (12)