ヒ素に対する粘土及び生物による修復の可能性
1998 年 38 巻 2 号 p. 54-67
詳細
1998 年 38 巻 2 号 p. 54-67
Clayey bioremediation at Osorezan area in Shimokita Peninsula, Aomori Prefecture, is reported in this paper. The relations among river sediments, plants and bacteria to bioremediation under strong acidic condition were revealed by SEM-EDX observation and ED-XRF analyses. The clayey sediments contain a large amount of arsenic which is toxic for living things. But, algae, sickle-shaped bacteria, and Scirpus lacustris L. of vascular plant survive in this geothermal area. The algae grow in black microbial mats at pH 3.0, Eh 102 mV, and DO 8.7mg/l condition. The sickle-shaped bacteria are observed in hot spring water at 42°C. Scirpus lacustris L. of vascular plant predominantly was observed around a stream. They have been survived to obtain the ability of tolerance of toxic elements such as As, Ti and Fe. These microorganisms and lower plants of endurance against toxic elements could be useful to bioremediation at heavy metal contaminated sediments. Furthermore, sulfides and sulphur play an important role in retaining and remobilizing arsenic from contaminated sediments. Clays will scavenge the arsenic with the formation of Asmaterials.
