Takehide Hama
Kumamoto University
31Publications
6H-index
123Citations
Publications 31
Newest
Published on Feb 1, 2019in Chemosphere 4.43
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 Mar 1, 2019in Science of The Total Environment 4.61
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...
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Published on Apr 1, 2018in Chemosphere 4.43
Luong Van Duc1
Estimated H-index: 1
(Kumamoto University),
Bongkeun Song27
Estimated H-index: 27
(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 May 1, 2017in Urban Forestry & Urban Greening 2.78
Yoshikazu Tanaka19
Estimated H-index: 19
(Kyoto University),
Shigeto Kawashima9
Estimated H-index: 9
(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 Oct 1, 2017in Journal of Hydrologic Engineering 1.58
Nian Hong3
Estimated H-index: 3
,
Takehide Hama6
Estimated H-index: 6
+ 3 AuthorsYasunori Kawagoshi12
Estimated H-index: 12
Source Cite
Published on Jan 1, 2016in Science of The Total Environment 4.61
Nian Hong3
Estimated H-index: 3
(Kumamoto University),
Takehide Hama6
Estimated H-index: 6
(Kumamoto University)
+ 4 AuthorsYasunori Kawagoshi12
Estimated H-index: 12
(Kumamoto University)
Abstract Groundwater level simulation models can help ensure the proper management and use of urban and rural water supply. In this paper, we propose a groundwater level tank model (GLTM) based on a conceptual rainfall–runoff model (tank model) to simulate fluctuations in groundwater level. The variables used in the simulations consist of daily rainfall and daily groundwater level, which were recorded between April 2011 and March 2015 at two representative observation wells in Kumamoto City, Jap...
9 Citations Source Cite
Yasunori Kawagoshi12
Estimated H-index: 12
,
Takehide Hama6
Estimated H-index: 6
+ 3 AuthorsKazuo Tomiie2
Estimated H-index: 2
Kumamoto City that has a population of 0.7 million depends on the only groundwater for the drinking-water demand. Recently, there are growing concerns about a groundwater contamination by nitrate. In this study, we aimed to reveal the situation and cause of nitrate contamination of groundwater in Kumamoto City and its neighbouring area by a combination of water-quality measurement and the analysis of public data. Nitrate concentration in the groundwater varied according to the area-location, how...
1 Citations Source Cite
Takehide Hama6
Estimated H-index: 6
(Kumamoto University),
Tomohisa Nagai2
Estimated H-index: 2
(Kyoto University)
+ 2 AuthorsDaichi Iwasaki3
Estimated H-index: 3
(Ministry of Agriculture, Forestry and Fisheries)
Source Cite
Published on Jan 1, 2016in Biochemical Engineering Journal 3.23
Xiaowu Huang4
Estimated H-index: 4
(Kumamoto University),
Kohei Urata3
Estimated H-index: 3
(Kumamoto University)
+ 3 AuthorsYasunori Kawagoshi12
Estimated H-index: 12
(Kumamoto University)
Abstract Anaerobic ammonium oxidation (anammox) is an innovative pathway for biological nitrogen removal. The raw nitrogenous wastewater is ill-suited for direct depletion by anammox due to lack of sufficient nitrite. Partial nitritation (PN) was operated in a membrane bioreactor (MBR) to generate suitable feed for anammox, and functional microbes were analysed by 16S rRNA sequence analysis. The dissolved oxygen was adopted as the key selection factor to realize partial nitritation. The PN was r...
6 Citations Source Cite
Published on Apr 1, 2016in Chemosphere 4.43
Qiaoyan Wei4
Estimated H-index: 4
(Kumamoto University),
Yasunori Kawagoshi12
Estimated H-index: 12
(Kumamoto University)
+ 4 AuthorsTakehide Hama6
Estimated H-index: 6
(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...
17 Citations Source Cite
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