Influence of hypersaturated dissolved oxygenated water on the elution of hydrogen sulfide and methane from sediment in the dredged area in polyhaline Lake Nakaumi
Influence of hypersaturated dissolved oxygenated water on the elution of hydrogen sulfide and methane from sediment in the dredged area in polyhaline Lake Nakaumi
复制标题
过饱和溶解氧水对中海湖多盐湖疏浚区沉积物中硫化氢和甲烷溶出的影响
DOI：
10.1007/s11355-014-0270-y
复制
发表时间：
2015
影响因子：
2
通讯作者：
Seike Y
中科院分区：
文献类型：
--
作者：
Sugahara S;Kamiya H;Suyama Y;Senga Y;Ayukawa K;Okumura M;Seike Y
在多盐湖Nakaumi的疏浚区域，在13.8米(底部以上1米)的深度安装了向水中供应过饱和溶解氧(DO)而不进行垂直混合的设备。在13.8m深度的过饱和DO输送期间，每月调查溶解硫化物(包括H2S和HS-−(Σ)的垂向分布，以及底质水柱和间隙水中CH4的浓度，并确定靠近底质的区域为氧气。在含氧环境中，H_2S与DO发生化学反应，很容易被迅速氧化。虽然实验区的甲烷浓度比对照区低95%，但即使在底部附近观察到20%-220%的DO，也没有检测到H_2S，但仍检测到CH_4。因此，我们可以证实，供应过饱和DO可以通过防止H_2S的释放来改善水质和生态系统。
Equipment for supplying hypersaturated dissolved oxygen (DO) into water without vertical mixing was installed at a depth of 13.8 m (1 m above the bottom) in the dredged area of polyhaline Lake Nakaumi. The vertical profile of dissolved sulfides, including H2S and HS−(ΣH2S), and the CH4concentrations in the water column and interstitial water of bottom sediment were investigated monthly during a period when hypersaturated DO water was delivered at a depth of 13.8 m. The area near the bottom was identified as oxic. H2S is easily and rapidly oxidized in an oxic environment through a chemical reaction with DO. Although the concentration of CH4in the experimental area was 95 % lower than that in the control area, CH4was detected, even though 20–220 % DO was observed near the bottom, where no H2S was detected. We can therefore confirm that supplying hypersaturated DO can improve the water quality, as well as the ecosystem, by preventing the evolution of H2S.