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

基本信息

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

项目摘要

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

日本北北湖挖土区（水深：15m）的降压水已经长期暴露于缺氧状况，除了冬季。在2007年至2009年期间，在疏and的区域进行了提供高溶解氧水的实验。在这项研究中，我们使用了一种新技术（WEP系统：Matsue Doken Co.，Ltd.），将高溶解的氧气引入疏and的区域。结果，在WEP系统的出口附近，溶解的氧气浓度增加到15-29mg/l，并在整个实验地点保持5-15mg/L，在潮汐电流（均匀的氢气）上（h__2s）（h__2s）的月份变化，在整个实验部位保持了6个月（09-May-OCT），并保持在5-15mg/l。区域。另外，在同一区域还观察到沉积物中的H_2S浓度和CH_4产量。在WEP系统的操作中，在底部水中未检测到H_2和CH_4的积累。此外，与对照区域相比，在沉积物中，H_2S几乎在0-4厘米的深度消失，而CH_4的产生速率也显着降低。在淡水湖的情况下，通常，铁（II）在还原状态下从底部沉积物中释放出来。然而，在中北湖中，它被源自硫酸盐还原的硫化氢所困，无法释放。在本研究中，硫化氢被氧化并消失，并且可以从底部沉积物中释放铁（II）的环境。这就是观察到抑制底沉积物对磷酸磷的释放的影响。高溶解氧水对基于硝化和反硝化的氮营养的自效功能的影响，通过在底部水中溶解的氧气（DO）的增加引起活性硝化，然后在沉积物 - 水系统中诱导的活性。还提出，高浓度的溶解氧抑制了超过200％的溶解氧，例如多chaetes，polychaetes，paraprionospio patiens，prionospio pulchra等可以在整个实验期间在疏and的区域中形成其栖息地。但是，在此期间没有解决双壳类动物。沉积物陷阱中被捕获的生物（长40厘米，内径为10厘米）表明，Asari蛤lam的幼虫，Philippinarum和亚洲贻贝，Musculista senhousia可能会达到底层的底层，但由于p的ph少于8. 3. per to shew to per，它可能无法招募到较低的pH，因此，它的per含量较低。湖泊中的沉积物。较少的

项目成果

期刊论文数量（66）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

底泥間隙水中硫化水素の定量の重要性について

论底泥孔隙水中硫化氢定量的重要性

DOI：
发表时间：
2009
期刊：
影响因子：
0
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
通讯作者：
管原庄吾・鮎川和泰・奥村稔・清家泰・圦本達也・木元克則

水圏におけるメタンの生成について

关于水圈中的甲烷产生

DOI：
发表时间：
2008
期刊：
影响因子：
0
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
通讯作者：
須山雄介・管原庄吾・奥村稔・清家泰

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

苦咸水沉积物中的氮净化能力（中海、宍道湖、太田川）2

DOI：
发表时间：
2007
期刊：
影响因子：
0
作者：
志鎌隆;高橋清;澁谷健一;平尾匡章・藤井健士・福森亮子・奥村稔・清家泰
通讯作者：
平尾匡章・藤井健士・福森亮子・奥村稔・清家泰

Denitrification rates in two brackish lagoons the eastern coast of Korea

韩国东海岸两个咸咸泻湖的反硝化率

DOI：
发表时间：
2007
期刊：
影响因子：
0
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

環境水中溶存酸素の簡便な吸光光度定量法

定量环境水中溶解氧的简单分光光度法