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:
  • 金额:
    $ 29.87万
  • 依托单位:
  • 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
日本中海咸水湖疏浚区(水深15m)的低浓度水除冬季外长期处于缺氧状态,2007年在疏浚区进行了供应高溶氧水的实验。到 2009 年。在这项研究中,我们使用了一项新技术(WEP 系统:MATSUE DOKEN Co., Ltd.)将高溶解氧水引入到结果,WEP系统出口附近的低水位溶解氧浓度上升至15~29mg/L,整个试验场保持在5~15mg/L,持续了6个月(09May)。 10月),尽管有潮流,但在疏浚区域的底层水中观察到硫化氢(H_2S)和甲烷(CH_4)的每月变化。此外,在WEP系统运行过程中,同一区域的沉积物中H_2S浓度和CH_4生成率也没有检测到H_2S和CH_4的积累。此外,H_2S在0℃时几乎消失。沉积物深度为4cm时,CH_4生成率与对照区相比显着下降。在淡水湖的情况下,一般情况下,铁(II)从底部沉积物中释放量减少然而,在半咸水的中海湖中,它被硫酸盐还原产生的硫化氢捕获而无法释放,在本研究中,硫化氢被氧化并消失,并且铁(II)可以从环境中释放出来。形成底泥,观察底泥对磷酸盐磷释放的抑制效果。高溶氧水体对硝化反硝化氮素自净功能的影响。研究表明,底层水中溶解氧(DO)的增加会诱导活性硝化作用,随后沉积物-水系统中的反硝化活性也会受到抑制。 200%。在整个实验期间,多毛类、Parprionospio patiens、Prionospio pulchra 等底栖动物都可以在疏浚区域形成栖息地,但双壳类动物。沉积物捕集器(40厘米长、内径10厘米的管道)中捕获的生物表明,菲律宾蛤仔(Ruditapes philippinarum)和亚洲贻贝(Musculista senhousia)的幼虫可以到达底层,但可能无法招募。由于深度超过3m的pH值低于8,因此表明目前的新技术对于改善海底水和沉积物的环境非常有用。湖泊较少。

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)
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
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
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
  • DOI:
  • 发表时间:
    2009
  • 期刊:
  • 影响因子:
    0
  • 作者:
    奥村稔;塩野貴志;安東国広;清家泰
  • 通讯作者:
    清家泰
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