Papers - SUZUKI Yoshihiro
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Thimdee W., Deein G., Nakayama N., Suzuki Y., Matsunaga K.
Wetlands Ecology and Management 16 ( 6 ) 463 - 470 2008.12
Language：English Publishing type：Research paper (scientific journal) Publisher：Wetlands Ecology and Management
Stable carbon and nitrogen isotope ratios were used to elucidate primary carbon sources and trophic relationships of the fish and shrimp community in the Klong Ngao mangrove ecosystem, southern Thailand. There were no significant differences in isotopic compositions of biota between mangrove and offshore sites (Welch-Aspin test). The δ 15 N values of eight fish species and two shrimp species at both sites were also not significantly different by the test, meaning that at both sites they feed on the same diets due to the discharge of large quantities of mangrove sediments. The δ 15 N isotopic enrichment of consumers suggested that there are four trophic levels in the Klong Ngao food web, with at least two fish species capable of switching feeding strategies and thus altering their apparent trophic positions. Phytoplankton culture experiments indicated that mangrove-derived sediments could play an important role in stimulating phytoplankton growth for low turbidity offshore areas, thus providing an alternate food source. The isotopic associations among sources and consumers indicated that mangroves were the major carbon source supporting aquatic food webs in the Klong Ngao ecosystem. © 2008 Springer Science+Business Media B.V.
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蛍光分析による大淀川河川水の水質評価 Reviewed
海賀信好, 鈴木祥広, 高橋基之, 世良保美
用水と廃水 50 ( 11 ) 941 - 949 2008.11
Language：Japanese Publishing type：Research paper (scientific journal)
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PHOSPHORUS RECOVERY FROM LIVESTOCK MANURE INCINERATION ASH AND PRODUCT CHARACTERISTICS Reviewed
SEKITO Tomoo, DOTE Yutaka, KAIKAKE Katsuya, MASUDA Sumio, SUZUKI Yoshihiro
Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 64 ( 2 ) 88 - 95 2008.8
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
Livestock animal manure incineration ash contains phosphorus, which has fertilizer effect and is exhaustible resource. This paper describes the technique of phosphorus recovery from livestock animal manure incineration ash. Phosphorus concentration and chemical compound in recovered product were determined. Phosphorus was extracted from ash with 1.5M HCl solution and the products contained phosphorus was recovered as precipitate by alkali addition to the acid solution. Citric acid soluble phosphate content in the recovered product is 150 mg/g, which is comparable to commercially available calcined phosphate fertilizer. Phosphorus existed in the recovered product as calcium hydrogen phosphate dihydrate (DCPD) or hydroxy apatite (HAP). The ratio of DCPD and HAP in the products was depended on pH of the precipitation.
DOI： 10.2208/jscejg.64.88
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Suzuki Y., Hanagasaki N., Furukawa T., Yoshida T.
Journal of Bioscience and Bioengineering 105 ( 4 ) 383 - 388 2008.4
Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Bioscience and Bioengineering
The removal of bacteria from rearing water and washing water in aquaculture systems, aquariums and fishing port facilities is the most important means of diminishing the risk of fish diseases, improving public health and ensuring high food quality. However, there are few methods of bacterial elimination, e.g., disinfection. Thus, it is necessary to develop a technology for bacterial removal from coastal seawater. In this study, the removal efficiency for several groups of bacteria by foam separation using dispersed bubbles and surface-active substances was determined using both batch equipment and a continuous-flow unit. By batch processing with only 1 mg/l milk casein added as a surface-active substance and by supplying bubbles, viable bacteria, enterococci, Vibrio, and Salmonella-like bacteria were removed effectively at removal efficiencies of 80% or greater. In addition, suspended solids were also removed from coastal seawater. However, fecal coliforms were difficult to remove by foam separation. The removal efficiency for viable bacteria was greater than 70% using a continuous system. Bacteria were concentrated in a very small amount of generated foam and removed from the water. The foam separation using dispersed bubbles and surface-active substances is a feasible convenient technology for seawater purification as a treatment prior to membrane filtration or ultraviolet irradiation. © 2008 The Society for Biotechnology, Japan.
DOI： 10.1263/jbb.105.383
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河口域の環境調査における溶存酸素測定の留意点 Reviewed
鈴木祥広, 原村優子, 古川隼士
用水と廃水 49 ( 11 ) 951 - 956 2007.11
Language：Japanese Publishing type：Research paper (scientific journal)
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Monitoring of Bacteria in Aoshima Fishing Port, Japan Reviewed
SUZUKI Yoshihiro, HANAGASAKI Nobuaki, TAKAHASHI Hironori, FURUKAWA Takashi, YOSHIDA Terutoyo
Japan journal of water pollution research 30 ( 10 ) 597 - 601 2007.10
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society on Water Environment
The proper management of water quality in fishing ports handling seafood is necessary for ensuring food quality and public health. In this study, the hygienic conditions at Aoshima fishing port (Miyazaki, Japan) and surrounding coastal areas were investigated. In water samples obtained from inner sites of the port using a lift pump, coliform counts and fecal streptococcus counts varied seasonally from 10 to 10<SUP>4</SUP> MPN·100m<I>l</I><SUP>-1</SUP> and from 0 to 10<SUP>2</SUP> MPN·100m<I>l</I><SUP>-1</SUP>, respectively. In water samples from an estuary located adjacent to the port, coliform counts and fecal streptococcus counts were1 to 2 orders of magnitude higher that those of water samples from the fishing port. Coliform counts obtained by the MPN method were significantly higher than fecal streptococcus counts and fecal coliform counts obtained by the membrane filter method. Fecal streptococcus counts and fecal coliform counts corresponded to 2% and 3% of coliform counts, respectively. There was an inverse correlation between salinity and coliform counts, and coliforms seemed to be diluted with seawater. Fecal streptococcus counts showed a lower correlation with not only salinity but also turbidity, suggesting that sedimentation and resuspension affect the fecal streptococcus population dynamics in the estuary near the port.
DOI： 10.2965/jswe.30.597
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家畜ふん焼却灰からのリン回収方法の開発と回収物性状 Reviewed
関戸知雄, 土手裕, 勝也, 貝., 増田純雄, 鈴木祥広
土木学会論文集Ｇ 62 ( 2 ) 2007.9
Language：Japanese Publishing type：Research paper (scientific journal)
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Fate of natural estrogens in batch mixing experiments using municipal sewage and activated sludge Reviewed
Suzuki Y., Maruyama T.
Water Research 40 ( 5 ) 1061 - 1069 2006.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Water Research
Since natural estrogens such as 17β-estradiol (E2) and estrone (E1) are excreted daily by humans, E2 and E1, which are classified as inevitable endocrine-disrupting chemicals, are always present in sewage wastewater. For several years, the monitoring and removal of natural estrogens at sewage treatment plants have been examined by many investigators. However, little is known regarding the exact behavior of estrogens in actual sewage when in contact with activated sludge. In this study, the fate of E2 and E1 as a result of adsorption and decomposition in batch mixing experiments using municipal wastewater and activated sludge collected from an actual municipal sewage treatment plant was investigated. Estrogen concentrations were determined using an enzyme-linked immunosorbent assay (ELISA) kit. E2 and E1 in sewage were removed from the liquid phase in contact with activated sludge, and E2 and E1 adsorbed on the sludge were decomposed in 4 h. Significant changes in the adsorption and decomposition of E2 and E1 on the sludge were not observed at low temperatures or when different sludge samples were used such as those acclimatized to low-loading and high-loading conditions. In contrast, the processes leading to the removal of estrogens, such as the adsorption and decomposition of estrogens in contact with activated sludge, were inactivated by sterilizing the sludge. Natural estrogens adsorb onto the activated sludge, and are therefore easy to be biodegraded. In a biological reaction process, therefore, the estrogens will be rapidly removed at the initial stage, when the sewage is satisfactorily mixed with the sludge. © 2006 Elsevier Ltd. All rights reserved.
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Removal of di-2-ethylhexyl phthalate (DEHP) from River Water Using Dispersed Bubbles Reviewed
SUZUKI Yoshihiro, ANDOH Yasuhiro, MARUYAMA Toshiroh, MITSUYAMA Munehito, SHIMOTSU Yoshihiro, GOMI Kenji, MORI Hirokazu, KUNIKANE Shoichi
Japan journal of water pollution research 29 ( 1 ) 29 - 35 2006.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society on Water Environment
In some water treatment plants, floating foam scum, which concentrates micropollutants such as di-2-ethylhexyl phthalate (DEHP), is a serious problem. We assumed the mechanism of foam scum generation to be as follows: DEHP in water adsorbs onto the gas-liquid interface of bubbles and accumulates on the water surface by floating bubbles, and then is concentrated in foam generated by surface-active matter in raw river water. To apply this mechanism, in this study, the removal of DEPH from river water by generating foam using dispersed bubbles was investigated. When river water passed through a foam generator installed in a strong aerator, foam was continuously generated on the water surface and separated as collapsed-foam water. This collapsed-foam water was yellow-brown, and contained high amounts of suspended solids and colloids. However, the amount of collapsed-foam water generated was very small, less than 1% of the total flow volume. In comparison with suspended solids and dissolved organic matters, DEHP was highly concentrated in the collapsed-foam water. The removal efficiencies of DEHP ranged from 7% to 63% using the foam generator. The use of a simple process involving only intensive aeration and foam collection resulted in a high removal efficiency for hydrophobic micropollutants, such as DEHP, which accumulated in the gas-liquid interface from raw tap water.
DOI： 10.2965/jswe.29.29
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都市下水の高速高度処理システムにおけるエストロゲンの挙動 Reviewed
鈴木祥広，平良浩保，丸山俊朗
環境工学研究論文集 42 245 - 252 2005.12
Language：Japanese Publishing type：Research paper (scientific journal)
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Removal of emulsified oil from water by coagulation and foam separation Reviewed
Suzuki Y., Maruyama T.
Separation Science and Technology 40 ( 16 ) 3407 - 3418 2005.12
Language：English Publishing type：Research paper (scientific journal) Publisher：Separation Science and Technology
A new method of emulsified oil separation for oily wastewater incorporating simple operation and shortened treatment time is necessary for improved wastewater treatment in some manufacturing plants. In the present study, the removal of emulsified oil from water by coagulation and foam separation using poly aluminum chloride (PAC) and milk casein was examined. By adding casein before the foam separation process, the oil removal was dramatically improved. By using surfactant (LAS) as a frother, the dosage of casein was drastically reduced. Furthermore, for processing actual oily water, LAS was unnecessary because a sufficient amount of surfactants for foaming was included in the wastewater. For treatment of the actual oily wastewater collected from a steel manufacturing plant, the optimum condition for PAC and casein was 30 mg-Al/L and 10 mg/L, respectively, and the oil concentration decreased from 170 mg/L to 2.2 mg/L. After examining several types of oily wastewater, 96-99% of oil removal efficiency was obtained by adjusting the dosages of PAC and casein. Coagulation and foam separation using casein has shown a high potential as an alternative method to dissolved air flotation (DAF) for processing emulsified oil water.
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沿岸環境調査における底質CODの測定 Reviewed
鈴木祥広，原村優子，中村孝洋，丸山俊朗
用水と廃水 47 ( 11 ) 65 - 69 2005.11
Language：Japanese Publishing type：Research paper (scientific journal)
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Removal of heavy metals from aqueous solution by nonliving Ulva seaweed as biosorbent Reviewed
Suzuki Y., Kametani T., Maruyama T.
Water Research 39 ( 9 ) 1803 - 1808 2005.5
Language：English Publishing type：Research paper (scientific journal) Publisher：Water Research
The growth of dense green seaweed mats of Ulva spp. is an increasing problem in estuaries and coasts worldwide. The enormous amount of Ulva biomass thus becomes a troublesome waste disposal problem. On the other hand, it has been revealed that nonliving seaweed biomass, particularly brown seaweeds, has a high capacity for assimilating heavy metals. In this study, the possibility of using Ulva seaweed biomass as a biosorbent for the removal of heavy metals was examined. After processing, the biomass material was very easy to separate from the aqueous solution using a mesh. The sorption capacity of Cd on Ulva biomass increased upon pretreatment with alkali solution. The outstanding function of the biosorbent was demonstrated at around pH 8. On the basis of the Langmuir isotherms of Cd, Zn and Cu using the alkali-pretreated biomass, the parameters q m and b were determined to be within the narrow range of 60-90 mg/g and 0.03-0.04 L/mg, respectively, for each metal. Given the q m and b values, Ulva seaweed is a good biosorbent material for removing heavy metals. In an experiment using artificial wastewater containing Cd, Zn, Cu, Cr and Ni, it was possible to remove each metal simultaneously using Ulva biomass. Adsorption by Ulva biomass is effective for the removal of heavy metals from wastewater. © 2005 Elsevier Ltd. All rights reserved.
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浄化槽におけるエストロゲンの実態調査 Reviewed
鈴木祥広，平良浩保，満山宗人，下津義博，丸山俊朗
用水と廃水 47 ( 3 ) 63 - 69 2005.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Behavior of natural estrogens in high-rate advanced treatment system
SUZUKI Yoshihiro, TAIRA Hiroyasu, MARUYAMA Toshiroh
Doboku Gakkai Ronbunshuu G 42 245 - 252 2005
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
The behavior of the highly potential endocrine disrupters 17β-estradiol (E2) and estrone (E1) was investigated in an air-fluidized-bed biofilm reactor system, which consisted of an oxidation reactor, a nitrification reactor and a denitrification reactor using a polypropylene carrier, for advanced sewage treatment. E2 and E1 concentrations were determined using an enzyme-linked immunosorbent assay (ELISA) kit. The effluent concentrations of total organic carbon and total nitrogen from the denitrification reactor were maintained at 8mg-C/L and 5mg-N/L, respectively, under a total hydraulic retention time of 4 hr in the biological process. The removal of nitrogen as advanced sewage treatment was achieved by the system. However, the removal efficiencies of E2 and E1 in the biological process were less than 70% and 40%, respectively. Over three weeks, the average estrogen concentrations in the effluent of the denitrification reactor were 2.6ng/L for E2 and 28.2ng/L for El. Although the system successfully achieved advanced treatment, the removal efficiency of natural estrogens was lower than that for a conventional activated sludge plant. The advanced treatment of municipal sewage must be promoted to improve the aquatic environment, while it is necessary to take into account the fate of estrogens in the process.
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Removal of Suspended Solids by Coagulation and Foam Separation using Milk Casein
MARUYAMA Toshiro, SUZUKI Yoshihiro
Japanese journal of multiphase flow 18 ( 4 ) 314 - 323 2004.12
Language：Japanese Publishing type：Research paper (scientific journal)
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Nutrient Recovery from Fish Culture Water Using Seaweed Biofilter
SUZUKI Yoshihiro, KAMETANI Takuji, MARUYAMA Toshiroh
Journal of Japan Society on Water Environment 27 ( 12 ) 817 - 824 2004.12
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society on Water Environment
Nutrient recovery from fish culture water using a seaweed biofilter was investigated. The green alga Ulva onoi was selected for use as a seaweed biomass. The load capacity of ulva per day derived from nitrate (NO3-N) uptake was 0.9mg-N·g-wet-1·d-1. A closed recirculating aquaculture system consisting of a fish tank, an intensive aeration unit, a nitrification unit and a seaweed biofilter tank was constructed. The required amount of seaweed biomass as determined from feed quantity and load capacity was provided into the seaweed biofilter tank, and fish (Oreochromis mossambicus) were cultured in the system. NO3-N was fixed in the seaweed biomass throughout the experimental period, and did not accumulate in the culture water. The concentrations of ammonium and nitrite were maintained at very low levels of less than 0.15mg-N·l-1. In addition, the survival rate of the cultured fish was 100%, and the ulva in the seaweed biofilter grew well throughout the experimental period. Each process proceeded smoothly, and the aquaculture system was property maintained. As a result of the nitrogen mass balance in the culture, approximately 70% of all the nitrogen excreted by the fish was fixed by the ulva. For an aquaculture system, a seaweed biofilter is a useful water treatment device for achieving both nutrient removal and seaweed production with low maintenance.
DOI： 10.2965/jswe.27.817
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アオサを利用した海藻バイオフィルターによる魚類飼育水からの栄養塩回収 Reviewed
鈴木祥広，亀谷卓司，丸山俊朗
水環境学会誌 27 ( 12 ) 817 - 824 2004.12
Language：Japanese Publishing type：Research paper (scientific journal)
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界面活性タンパク質を用いた泡沫分離法による海水からの細菌除去 Reviewed
鈴木祥広，花ヶ崎宣昌，吉田照豊，丸山俊朗
環境工学研究論文集 41 147 - 153 2004.12
Language：Japanese Publishing type：Research paper (scientific journal)
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TAKEUCHI Yuzo, ISHITOKU Hiroyuki, MARUYAMA Toshiro, SUZUKI Yukihiro, TSUZUKI Eiji, ENDOU Makoto
Environmental conservation engineering 33 ( 9 ) 699 - 705 2004.9
Language：Japanese Publishing type：Research paper (scientific journal)