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Takehide Hama
Kumamoto University
31Publications
7H-index
125Citations
Publications 31
Newest
Published on Apr 1, 2019in Paddy and Water Environment 1.26
Akinori Ozaki3
Estimated H-index: 3
(Kyushu University),
Kazuaki Hiramatsu12
Estimated H-index: 12
(Kyushu University),
Takehide Hama7
Estimated H-index: 7
(Kumamoto University)
The torrential rains that hit northern Kyushu, Japan, on July 5–6, 2017, caused serious damage, especially in Asakura City, Fukuoka Prefecture, and in Hita City, Oita Prefecture. The primary meteorological mechanism that caused these torrential rains can be summarized as record-breaking heavy rains caused by linear rainbands in northern Kyushu. These heavy rains triggered hillside collapse, with the massive volume of driftwood and soil destroying downstream areas. Shortly after the immediate dam...
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Published on Mar 1, 2019in Science of The Total Environment 5.59
Yasunori Kawagoshi12
Estimated H-index: 12
(Kumamoto University),
Yuichi Suenaga2
Estimated H-index: 2
+ 3 AuthorsLuong Van Duc1
Estimated H-index: 1
(Kumamoto University)
Abstract There are growing concerns about nitrate contamination in Kumamoto City, where >700,000 people completely depend on groundwater as a source of drinking water. We found that some groundwater samples showed considerably different nitrate concentrations although their sampling locations were close to one another, and we speculated that this phenomenon was due to the differences in subsurface geological properties. In order to verify this hypothesis, we carried out temporally intensive long...
1 Citations Source Cite
Published on Feb 1, 2019in Chemosphere 5.11
Yasunori Kawagoshi12
Estimated H-index: 12
(Kumamoto University),
Yuki Yamashita4
Estimated H-index: 4
+ 2 AuthorsHiroaki Ito6
Estimated H-index: 6
(Kumamoto University)
Abstract Nitrogen-removal processes using anammox bacteria are expected to achieve high-rate removal while remaining economical, and their practical applications have been investigated. However, anammox bacteria still have unfavorable characteristics for practical use, including susceptibility to a change in environmental conditions. In this study, with an aim of exploring the adaptability of mixed anammox bacteria to environmental conditions, the shift of nitrogen-removal performance and bacter...
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Published on Apr 1, 2018in Chemosphere 5.11
Luong Van Duc1
Estimated H-index: 1
(Kumamoto University),
Bongkeun Song28
Estimated H-index: 28
(Virginia Institute of Marine Science)
+ 3 AuthorsYasunori Kawagoshi12
Estimated H-index: 12
(Kumamoto University)
Abstract Anaerobic ammonium oxidation (anammox) bacteria were enriched in continuous packed-bed columns with marine sediment. One column (SB-C) was packed with only marine sediment collected from a shrimp-aquaculture pond, and another column (SB-AMX) was inoculated with marine anammox bacteria (MAB) as a control. These columns were continuously fed with natural or artificial seawater including ammonium (NH 4 + ) and nitrite (NO 2 − ). The SB-AMX showed anammox activities from the beginning and c...
1 Citations Source Cite
Published on Oct 1, 2017in Journal of Hydrologic Engineering 1.44
Nian Hong3
Estimated H-index: 3
,
Takehide Hama7
Estimated H-index: 7
+ 3 AuthorsYasunori Kawagoshi12
Estimated H-index: 12
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Published on May 1, 2017in Urban Forestry & Urban Greening 3.04
Yoshikazu Tanaka19
Estimated H-index: 19
(Kyoto University),
Shigeto Kawashima11
Estimated H-index: 11
(Kyoto University)
+ 1 AuthorsKimihito Nakamura7
Estimated H-index: 7
(Kyoto University)
Abstract The creation of green rooftops is an important method for mitigating heat build-up in urban rooftop environments because they lower the sensible heat flux over the rooftop and conductive heat flux into the building. We propose a model for assessing thermal mitigation effects through a hydroponic urban greening system based on heat balance. We conducted an experiment with two different rooftops at two study sites, which were monitored for two months in two different years. Each rooftop w...
1 Citations Source Cite
Published on Jun 1, 2016in Environmental Science and Pollution Research 2.91
Xiaowu Huang4
Estimated H-index: 4
(Kumamoto University),
Kaihang Sun1
Estimated H-index: 1
(Kumamoto University)
+ 5 AuthorsYasunori Kawagoshi12
Estimated H-index: 12
(Kumamoto University)
Partial nitritation and anammox (PN/A) was applied in a lab-scale membrane bioreactor (MBR) to investigate its technical feasibility for treating ammonium-rich wastewater with low C/N ratio. The bacterial community was analyzed by molecular cloning and 16S rRNA sequence analysis. Partial nitritation (PN) was first realized in MBR by seeding aerobic activated sludge. With dissolved oxygen control, a steady effluent mixture with NO2 −-N/NH4 +-N ratio of 1.13 ± 0.08 was generated from the PN proces...
9 Citations Source Cite
Published on Apr 1, 2016in Chemosphere 5.11
Qiaoyan Wei4
Estimated H-index: 4
(Kumamoto University),
Yasunori Kawagoshi12
Estimated H-index: 12
(Kumamoto University)
+ 4 AuthorsTakehide Hama7
Estimated H-index: 7
(Kumamoto University)
Salinity tolerance is one of the most important factors for the application of bioreactors to high-salinity wastewater. Although marine anammox bacteria (MAB) might be expected to tolerate higher salinities than freshwater anammox bacteria, there is little information on the effects of salinity on MAB activity. This study aimed to reveal the nitrogen removal properties in a continuous MAB reactor under conditions of rapid and extensive salinity changes. The reactor demonstrated stable nitrogen r...
18 Citations Source Cite
Published on Feb 1, 2016in Building and Environment 4.82
Yoshikazu Tanaka19
Estimated H-index: 19
(Kyoto University),
Shigeto Kawashima11
Estimated H-index: 11
(Kyoto University)
+ 3 AuthorsYutaka Okumoto21
Estimated H-index: 21
(Kyoto University)
Abstract The use of green roofs is an important method for mitigating heating of urban rooftop environments. Our study aimed to demonstrate the mitigation of thermal effects on a hot rooftop during summer by a hydroponic system in which rice was grown. The system was installed on the top of a commercial building in the large city of Osaka, Japan; the roof was divided into two areas, one bare, the other covered by the hydroponic system. In both areas, we measured thermal factors, such as air temp...
2 Citations Source Cite
Luong Van Duc1
Estimated H-index: 1
(Kumamoto University),
Yuki Koga3
Estimated H-index: 3
(Kumamoto University)
+ 2 AuthorsYasunori Kawagoshi12
Estimated H-index: 12
(Kumamoto University)
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