Quality improvement of the bottom water and sediment at anoxic water in a brackish lake

咸湖缺氧底水和沉积物质量改善

• 批准号: 19201016
• 负责人: KEIKE Yasushi
• 金额: $ 29.87万
• 依托单位: Shimane University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19201016/
• 关键词: 環境修復技術; 貧酸素水塊; 水質汚濁; 新規な高濃度酸素水供給システム; 水質・底質改善; 自浄作用; 浚渫窪地; 硫化水素; メタン; 高酸素水導入装置; 水質改善; 底質改善; 酸化還元

Hypolimnion water in the dredged area (Water depth : 15m) of brackish Lake Nakaumi, Japan, has been exposed to anoxic condition for a long term except for winter season. The experiment supplying the high dissolved oxygen water was performed at the dredged area during 2007 to 2009. In this study, we used a new technology (WEP system : MATSUE DOKEN Co., Ltd.) for introducing the high dissolved oxygen water into the dredged area. As a result, the dissolved oxygen concentration in hypolimnion was increased up to 15～29mg/L nearby the outlet of WEP system, and was kept at 5-15mg/L in the whole experimental site, for a 6 month (09May-Oct) in spite of the tidal current.Monthly variations of hydrogen sulfide (H_2S) and methane (CH_4) were observed at the bottom water in the dredged area. In addition, H_2S concentration and CH_4 producing rate in sediments were also observed at the same area. No accumulations of H_2S and CH_4 were detected in the bottom water during the operation of the WEP syst … More em. Moreover, H_2S was almost disappeared at 0-4cm depth in sediment, and also CH_4 producing rate decreased markedly compared to that at the control area.In the case of a freshwater lake, generally, the iron (II) is released from the bottom sediment in a reduction state. In brackish Lake Nakaumi, however, it is trapped by the hydrogen sulfide derived from sulfate reducing and cannot be released. In the present study, hydrogen sulfide was oxidized and disappeared, and the environment that iron (II) can be released from the bottom sediment was formed. Thus, the effect of release inhibition from bottom sediment for phosphate phosphorus was observed.The effect of high dissolved oxygen water on self-purifying function for nitrogen nutrient based on nitrification and denitrification was investigated. An active nitrification was induced by the increase of dissolved oxygen (DO) in the bottom water, followed by induction of denitrifying activity in the sediment-water system. It was also suggested that nitrification was inhibited by high concentration of dissolved oxygen exceeding 200%.Benthos such as polychaetes, Paraprionospio patiens, Prionospio pulchra etc. could form their habitat at the dredged area throughout the experimental periods. However, bivalves were not settled during the periods. The captured organisms in the sediment traps (40cm long and 10cm inner diameter pipes) showed that the larvae of Asari clam, Ruditapes philippinarum and Asian mussel, Musculista senhousia, could reach the bottom layer but could not recruit probably due to low pH less than 8 in deeper than three 3m.Thus, it was suggested that the present new technology is very useful for an environmental improvement of the bottom water and sediment in lakes. Less

日本中海半咸水湖疏浚区（水深15 m）的低层水体，除冬季外，长期处于缺氧状态。2007 - 2009年在疏浚区进行了高溶解氧水的补给试验。在本研究中，我们使用了一种新技术（WEP系统：MATSUE DOKEN Co.，（香港）用于将高溶解氧水引入疏浚区域。结果表明，在6个月（5月9日~ 10月）的时间里，尽管有潮流作用，但在WEP系统出口附近，底层水中溶解氧浓度可达15~ 29 mg/L，整个试验区的溶解氧浓度保持在5- 15 mg/L。此外，还观测了同一海域沉积物中H_2S浓度和CH_4产生速率。在WEP系统运行过程中，底层水中未检测到H_2S和CH_4的积累 ...更多信息 em.沉积物中H_2S在0-4cm深度几乎消失，CH_4的产生速率也明显降低，在淡水湖泊中，Fe（II）一般以还原态从沉积物中释放出来。然而，在半咸水湖中，它被硫酸盐还原产生的硫化氢所捕获，无法释放。在本研究中，硫化氢被氧化和消失，并形成了铁（II）可以从底部沉积物中释放的环境。研究了高溶解氧水体对底泥中磷酸盐磷释放的抑制作用，探讨了高溶解氧水体对基于硝化反硝化作用的氮营养盐自净化功能的影响。底层水体溶解氧的增加导致了活性硝化作用的发生，随后沉积物-水系统中的硝化作用也随之发生。结果表明，疏浚区溶解氧浓度超过200%时，硝化作用受到抑制，多毛类、Paraprionospio patiens、Prionospio pulchra等底栖生物可在整个试验期间在疏浚区形成栖息地。然而，双壳贝类在此期间没有定居。沉积物陷阱中捕获的生物（长40 cm，内径10 cm）的实验结果表明，菲律宾蛤仔（Ruditapes philippinarum）和亚洲贻贝（Musculista senhousia）的幼虫可以到达底层，但在3个3 m以下的深度可能由于pH值低于8而不能补充。认为该技术对改善湖泊底质水环境具有重要意义。少

项目成果

Denitrification rates in two brackish lagoons the eastern coast of Korea

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• 发表时间: 2007
• 作者: T. Akatsuka;H. S. Shin;Y. Seike;K. Ayukawa;A. Yagi;M. Umemura;A. Yokoyama;M. Nagano;H. Azumi;M. Kihira;Jun-Kil Choi;O.Mitamuta
• 通讯作者: O.Mitamuta

汽水域堆積物(中海・宍道湖・太田川)における窒素浄化能について2

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底泥間隙水中硫化水素の定量の重要性について

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• 发表时间: 2009
• 作者: 永田祐介;野瀬健;錦織充広;下東康幸;管原庄吾・鮎川和泰・奥村稔・清家泰・圦本達也・木元克則
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• 发表时间: 2008
• 作者: 阿部政浩;宮村悟史;中村幸治;北智洋;大寺康夫;山田博仁;須山雄介・管原庄吾・奥村稔・清家泰
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環境水中溶存酸素の簡便な吸光光度定量法

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• 发表时间: 2009
• 期刊: 分析化学 58
• 作者: 奥村稔;塩野貴志;安東国広;清家泰
• 通讯作者: 清家泰