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Engineering educational research section Department of Civil and Environmental Engineerring Program |
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SUZUKI Yoshihiro
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Degree 【 display / non-display 】
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Doctor (Fisheries Science) ( 1994.3 Hokkaido University )
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Doctor (Engineering) ( 2001.9 University of Miyazaki )
Research Interests 【 display / non-display 】
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Water Environment
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environmental health
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Water treatment technology
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Environment
Research Areas 【 display / non-display 】
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Environmental Science/Agriculture Science / Environmental load reduction and remediation
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Environmental Science/Agriculture Science / Environmental dynamic analysis
Education 【 display / non-display 】
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Hokkaido University Graduate School, Division of Fisheries
1991.4 - 1994.3
Country：Japan
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Hokkaido University Faculty of Fisheries
- 1989.3
Country：Japan
Campus Career 【 display / non-display 】
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University of Miyazaki Engineering educational research section Department of Engineering Department of Civil and Environmental Engineerring Program Professor
2021.04 - Now
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University of Miyazaki Engineering educational research section Department of Civil and Environmental Engineering Professor
2013.07 - 2021.03
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University of Miyazaki Faculty of Engineering Civil and Environmental Engineering Environmental control course Associate Professor
2007.04 - 2013.06
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University of Miyazaki Faculty of Engineering Civil and Environmental Engineering Environmental control course Associate Professor (as old post name)
2006.05 - 2007.03
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University of Miyazaki Faculty of Engineering Civil and Environmental Engineering Environmental control course Research Assistant
1994.07 - 2006.04
External Career 【 display / non-display 】
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財団法人水産科学研究奨励会 研究員
1994.4 - 1994.6
Professional Memberships 【 display / non-display 】
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Japan Society on Water Environment
1995.4
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Japan Society of Civil Engineers
1995.4
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The Society for Biotechnology, Japan
2007.7
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環境技術学会
2015.7
Papers 【 display / non-display 】
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Optimum conditions for high-speed solid–liquid separation by ballasted flocculation Reviewed
Suzuki Y., Kaku R., Takahashi K., Kanai M., Tamai S., Annaka Y., Chuganji N.
Water Science and Technology 88 ( 1 ) 35 - 46 2023.7
Publishing type：Research paper (scientific journal) Publisher：Water Science and Technology
In the ballasted flocculation, high-speed sedimentation of suspensions is achieved using a microsand as a ballast material and a polymer flocculant combined with microflocs made of polyaluminum chloride (PAC) as an inorganic coagulant. In this study, three turbid water samples containing kaolin clay (kaolin concentration: 20, 200, and 500 mg/L) were treated by coagulation–sedimentation and ballasted flocculation. The effects of pH and PAC dosage, which are the controlling parameters for coagulation, and the microsand (silica sand) and polymer dosages, which are the controlling parameters for ballasted treatment, on the treatment efficiency and floc settling velocity were examined. The floc settling velocity under the optimum conditions was 17 times higher than that of the conventional coagulation–sedimentation process using PAC. The turbidity was 0.54 turbidity unit (TU) (TU as the kaolin standard), and its removal efficiency was 99.7%. Furthermore, turbid water samples with different kaolin concentrations (20 and 500 mg/L) were treated via the ballasted flocculation. In this study, fundamental information on the optimization of each dosage condition of coagulant, ballast, and polymer and pH condition in ballasted flocculation was obtained, and the removal mechanisms under optimal, underoptimistic and overoptimistic conditions were proposed.
DOI： 10.2166/wst.2023.204
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Tamai S., Ogura Y., Okuno M., Nukazawa K., Suzuki Y.
Environmental Science: Water Research and Technology 9 ( 7 ) 1792 - 1803 2023.4
Publishing type：Research paper (scientific journal) Publisher：Environmental Science: Water Research and Technology
Dissolved free extracellular DNA (exDNA), DNA released outside the cell, is present in aquatic environments at very low concentrations. Additionally, exDNA passes through a 0.22 μm filter, making it difficult to capture for analysis. Thus, information on exDNA is scarce, and the composition of genes present in exDNA is unknown. In this study, we developed a process for highly concentrating exDNA adsorbed on colloids and then dissolving the colloids with an acid using colloidal adsorption and foam concentration. After applying this strategy, 66.3% ± 3.3% of the uidA gene and 39.4% ± 2.4% of the tetA gene were recovered from genomic DNA carrying the uidA gene and plasmids carrying the tetA gene (n = 3), respectively. Using the developed method, 1000 mL of effluent of a wastewater treatment plant was concentrated to 400 μL, and exDNA was rapidly recovered at a high concentration (concentration ratio: 2500×). Furthermore, metagenomic analysis revealed the function of some exDNA genes, such as those encoding antibiotic resistance proteins. The information revealed in this study contributes to the elucidation of the mechanisms of horizontal gene transfer in aquatic environments.
DOI： 10.1039/d3ew00015j
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Tamai S., Shimamoto H., Nukazawa K., Suzuki Y.
Microorganisms 11 ( 4 ) 2023.4
Publishing type：Research paper (scientific journal) Publisher：Microorganisms
High counts of bacteria are present in beach sand, and human health threats attributable to contact with sand have been reported. In this study, we investigated fecal indicator bacteria in the top surface sand of coastal beaches. Monitoring investigations were performed during a monsoon when rainfall occurs randomly, and the composition of the coliforms was analyzed. The coliform count in the top surface sand (depth < 1 cm) increased by approximately 100 fold (26–2.23 × 103 CFU/100 g) with increasing water content because of precipitation. The composition of the coliforms in the top surface sand changed within 24 h of rainfall, with Enterobacter comprising more than 40% of the coliforms. Estimation of factors that changed the bacterial counts and composition revealed that coliform counts tended to increase with increasing water content in the top surface sand. However, the abundance of Enterobacter was independent of the sand surface temperature and water content. Coliform counts in the top surface sand rapidly increased and the composition showed remarkable variations because of the supply of water to the beach following rainfall. Among them, some bacteria with suspected pathogenicity were present. Controlling bacteria in coastal beaches is important for improving public health for beachgoers.
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Yadai T., Suzuki Y.
npj Clean Water 7 2023.2
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：npj Clean Water
Efficient desalination through a reverse osmosis (RO) membrane requires the prior removal of blockade-causing substances from raw seawater. To achieve ultrahigh-speed processing of a pretreatment process for seawater RO desalination, we combine traditional softening with ballasted flocculation (SBF) for Ca2+ and Mg2+ removal. An alkaline mixture of Ca(OH)2 and Na2CO3 was the most suitable softening agent for Ca2+ and Mg2+ removal with a reduced amount of generated sludge. This softening treatment simultaneously removed the suspended solids and bacteria from actual seawater. The settling velocity of the suspended solids generated via seawater softening was extremely low. Under the optimum conditions for desalinating actual seawater using an anionic polymer flocculant and microsand, the settling velocity exceeded 3.5 cm/s, 833 times higher than that of softening without ballasted flocculation. The amount of sludge after standing for 3 min was 76.5% lower in SBF than in conventional softening. The silt density index of the treated seawater met the water-supply standard of RO membranes (i.e., <3.0). Furthermore, the SBF-generated sludge exhibited considerably improved dewatering property than the sludge obtained via conventional softening. SBF can efficiently and quickly remove the causative substances of RO membrane fouling from seawater, thereby improving the treatability of generated sludge. SBF provides a new pretreatment process for seawater desalination using RO membranes.
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Suzuki Y., Shimizu H., Tamai S., Hoshiko Y., Maeda T., Nukazawa K., Iguchi A., Masago Y., Ishii S.
Environmental Monitoring and Assessment 195 ( 2 ) 2023.2
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Environmental Monitoring and Assessment
Waterborne diseases due to pathogen contamination in water are a serious problem all over the world. Accurate and simultaneous detection of pathogens in water is important to protect public health. In this study, we developed a method to simultaneously detect various pathogenic Escherichia coli by sequencing the amplicons of multiplex PCR. Our newly designed multiplex PCR amplified five genes for pathogenic E. coli (uidA, stx1, stx2, STh gene, and LT gene). Additional two PCR assays (for aggR and eae) were also designed and included in the amplicon sequencing analysis. The same assays were also used for digital PCR (dPCR). Strong positive correlations were observed between the sequence read count and the dPCR results for most of the genes targeted, suggesting that our multiplex PCR-amplicon sequencing approach could provide quantitative information. The method was also successfully applied to monitor the level of pathogenic E. coli in river water and wastewater samples. The approach shown here could be expanded by targeting genes for other pathogens.
Books 【 display / non-display 】
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宮崎県一ツ瀬川における濁水長期化 その原因と産官学民が連携した対策
鈴木祥広 （ Role： Joint author）
パブフル 2022.1
Language：Japanese Book type：Scholarly book
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A Membrane-Free Alternative Method for Concentration of Live Microorganisms by Foam Separation. In Monitoring Artificial Materials and Microbes in Marine Ecosystems: Interactions and Assessment Methods. Takahashi, T. (ed).
Suzuki, Y.（ Role： Sole author）
Bentham Science Publishers 2019
Responsible for pages：89-99 Language：English Book type：Scholarly book
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Y. Suzuki, T. Maruyama（ Role： Contributor）
Springer Japan 2017.12
Total pages：333 Responsible for pages：57-74 Language：English
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Y. Suzuki（ Role： Contributor）
Springer Japan 2017.12
Total pages：333 Responsible for pages：127-144 Language：English
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New topics in water resouces research and management
Suzuki, Y., and Maruyama, T.（ Role： Joint author）
Nova Science Publihers 2008.2
Language：English Book type：Scholarly book
MISC 【 display / non-display 】
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環境技術思想「陸域と海の境目から着想した研究テーマ」 Invited
鈴木祥広
月刊下水道 8 56 - 61 2023.8
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal)
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凝集・泡沫濃縮法を利⽤した河川⽔からの病原⼤腸菌の⾼感度検出および単離⼿法の開発
⽚渕真⼈, 清⽔宏樹, 糠澤桂, 鈴⽊祥広
第28回地球環境シンポジウム講演集 11 - 16 2020.9
Language：Japanese Publishing type：Research paper, summary (national, other academic conference)
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⽔環境からの⼤腸菌病原遺伝⼦ 7 種の⼀⻫検出系の確⽴
清⽔宏樹, 真砂佳史, ⼩椋義俊, 糠澤桂, 鈴⽊祥広
第28回地球環境シンポジウム講演集 1 - 3 2020.9
Language：Japanese Publishing type：Research paper, summary (national, other academic conference)
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都市下⽔の⽣物処理過程における⽣残⼤腸菌の系統群と薬剤耐性率の変化
謝暉, ⼩椋義俊, 糠澤桂, 鈴⽊祥広
第28回地球環境シンポジウム講演集 2020.9
Language：Japanese Publishing type：Research paper, summary (national, other academic conference)
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水環境におけるバンコマイシン耐性腸球菌（VRE）の分布とVRE耐性遺伝子の伝播ポテンシャルの評価 Invited Reviewed
西山正晃, 鈴木祥広
環境バイオテクノロジー学会誌 20 ( 1 ) 63 - 69 2020.7
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal)
Presentations 【 display / non-display 】
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浄水処理を目的とした活性炭吸着・バラスト凝集沈殿法の開発
高橋克弥，田中宏樹，鈴木祥広
第 58回 日本水環境学会年会（九州大学）講演プログラム・広告集 2024.3.7
Event date： 2024.3.6 - 2024.3.8
Language：Japanese Presentation type：Oral presentation (general)
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下水の簡易処理を目的とした海水にがり凝集・バラスト沈殿法の処理性評価
金井美優花，鈴木祥広
第 58回 日本水環境学会年会（九州大学）講演プログラム・広告集 2024.3.7
Event date： 2024.3.6 - 2024.3.8
Language：Japanese Presentation type：Oral presentation (general)
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一ツ瀬ダム貯水池におけるアオコ発生原因に関する調査研究
玉井荘一郎，鈴木祥広
第 58回 日本水環境学会年会（九州大学）講演プログラム・広告集 2024.3.6
Event date： 2024.3.6 - 2024.3.8
Language：Japanese Presentation type：Oral presentation (general)
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宮崎県大淀川上流域における志賀毒素産生大腸菌の検出
松山龍太郎，伊東悠介，竹本進，鈴木祥広
第 58回 日本水環境学会年会（九州大学）講演プログラム・広告集 2024.3.7
Event date： 2024.3.6 - 2024.3.8
Language：Japanese Presentation type：Oral presentation (general)
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河岸のイネ科植物がビーチの細菌汚染源である可能性に関する調査研究
西村恵美，西脇亜也，鈴木祥広
第26回日本水環境学会シンポジウム講演集 2023.9.20
Event date： 2023.9.20 - 2023.9.21
Language：Japanese Presentation type：Oral presentation (general)
Awards 【 display / non-display 】
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土木学会環境工学研究フォーラム優秀ポスター発表賞
2018.12 土木学会環境工学研究委員会 自然河川の最上流域における大腸菌と腸球菌の薬剤耐性株の存在実態
西村恵美, 糠澤桂, 鈴木祥広
Award type：Award from Japanese society, conference, symposium, etc.
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第53回環境工学研究フォーラム優秀ポスター発表賞
2016.12 土木学会環境工学委員会 レクリエーションビーチの砂浜におけるふん便指標細菌の存在実態と細菌叢解析
寺西康太郎・西山正晃・鈴木祥広
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
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日本水環境学会九州沖縄支部学術賞
2016.3 日本水環境学会九州沖縄支部 宮崎の水環境における薬剤耐性菌の存在実態に関する調査・研究
鈴木祥広
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
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平成27年度宮崎銀行ふるさと振興助成事業助成 学術研究部門
2016.1 一般財団法人 みやぎん経済研究所
鈴木祥広
Award type：Award from publisher, newspaper, foundation, etc. Country：Japan
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Environmental Technology/Project Award, Environmental Engineering Forum
2012.11
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
Grant-in-Aid for Scientific Research 【 display / non-display 】
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表流水からの簡便・迅速な薬剤耐性病原大腸菌の超高効率濃縮回収とゲノム履歴分析
Grant number：21H03620 2021.04 - 2025.03
独立行政法人日本学術振興会 科学研究費助成事業 基盤研究(B)（一般）
鈴木祥広
Authorship：Principal investigator
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水環境における院内感染原因菌の薬剤耐性獲得・伝達ポテンシャルの評価
2014.04 - 2017.03
科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
本研究では，最重要な院内感染原因菌であり，一方で水環境のふん便汚染指標細菌でもある腸球菌をターゲットとする。都市河川上流から下流・河口に至る流域全体において，各流域から単離・同定した菌株について，重要な6～8種類の抗生物質に対する薬剤耐性試験を実施し，薬剤耐性菌の発現・集積エリアを推定する。その発現・集積エリアの環境を模して人工的環境によるin vitro実験を実施することによって，薬剤耐性の獲得が薬剤投与によるヒト体内のみであるのか，あるいは水環境においても耐性能力を獲得する可能性があるのかについて検討する。さらに，感染学分野で採用されているFilter Mating法を応用し，各条件におけるドナー株（薬剤耐性株）からレシピエント株（非耐性株）への薬剤耐性の伝搬率を測定し，薬剤耐性獲得・伝搬ポテンシャルを評価する。
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都市を経由する河川流域における薬剤耐性菌の実態調査とその対策技術の提案
2011.03 - 2014.03
科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
都市を経由する河川流域における薬剤耐性菌について実態調査を行うとともに，耐性菌の対策技術の提案する。
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沿岸都市域におけるふん便性細菌の汚染状況の把握と汚染源追跡手法の開発
2007.05 - 2011.03
科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
沿岸都市域の「みやざき」と調査フィールドとし，ふん便性細菌の汚染状況の把握するとともに，遺伝子解析法を利用した汚染源追跡手法の開発を目的とする。
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沿岸都市域におけるエストロゲンの環境動態の追跡と削減技術の開発に関する研究
2004.04 - 2007.03
科学研究費補助金 基盤研究(C)
本研究では，沿岸都市域を研究対象とし，エストロゲンの河口・沿岸域における環境動態の追跡，ならびに新規のエストロゲン除去プロセスの開発について同時並行的に実施する。
（１）エストロゲンの河口・沿岸域における環境動態の追跡
沿岸都市域におけるエストロゲンの環境動態を追跡し，放流水量からエストロゲンの消長を定量的に明らかにする。
（２）エストロゲン除去プロセスの開発
下水高度処理プロセスを想定し，エストロゲン除去プロセスとしての物理化学的処理法と生物学的処理法について比較検討し，効率的な新規のプロセス導入を提案する。
Available Technology 【 display / non-display 】
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水環境における病原性微生物のフィールド調査とラボ研究
森林～河川～海に至る流域の水質保全・修復技術
泡沫濃縮法による微生物の超高感度検出・同定・定量の開発Home Page： 水環境研究室
Related fields where technical consultation is available：・上水、下水、河川水、湖沼・ダム、海水等などの水環境の水質分析・評価
・水質浄化プロセス・システムの機能評価
・農業用水・水産用水等の水の安全診断Message：小さな研究室ですが、学内外のたくさんの研究室と連携・協力し合い、メジャーな研究領域の“境目”“水ぎわ”にテーマの焦点をしぼって、非主流の先端的・特異的研究を進めています。
Committee Memberships 【 display / non-display 】
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日本水環境学会 日本水環境学会九州支部評議員
2003.4
Committee type：学協会
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土木学会 土木学会環境工学委員会 下水道資源の利活用を推進するための 調査検討小委員会委員
2016.4 - 2018.3
Committee type：学協会
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土木学会 土木学会環境工学委員会 今後の水環境保全に貢献する下水道システムの技術的課題と管理手法小委員会委員
2013.6 - 2015.3
Committee type：学協会
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日本水環境学会 レフリー
2012.4 - 2013.3
Committee type：学協会
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土木学会 土木学会環境工学委員会 今後の水環境保全に貢献する下水道システムの技術的課題と管理手法小委員会委員
2012.4 - 2013.3
Committee type：学協会
Social Activities 【 display / non-display 】
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MIYAZAKI UX 次世代を担うデジタル人材育成シンポジウム
Role(s)： Appearance
2024.3.13
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ＭＲＴサンデーラジオ大学
Role(s)： Appearance
2024.1.28
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みやざきDX推進フォーラム
Role(s)： Appearance
2024.1.18
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「高等教育コンソーシアム宮崎」設立記念シンポジウム
2023.11.23
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宮崎経済同友会 社会・教育委員会講演
Role(s)： Lecturer
2023.7.24