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STUDIES ON CONCRETE CORROSION BY SULFUR-OXIDIZING BACTERIA

硫氧化细菌对混凝土腐蚀的研究

基本信息

批准号：
09660094
负责人：
SUGIO Tsuyoshi
金额：
$ 2.18万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 2000
项目状态：
已结题

项目摘要

Acidophilic sulfur-oxidizing bacterium strain NB1-3 was isolated from corroded concrete of sewage treatment plant and identified as Thiobacillus thiooxidans. The growth of strain NB1-3 in a sulfur medium was strongly inhibited by not only nickel but also tungsten. It was found that nickel and tungsten bind to the plasma membrane of strain NB1-3 and inhibit the enzymes involved in energy generation, sulfur dioxygenase and sulfite oxidase, and as a result, inhibit cell growth. Sulfur-oxidizing bacterium strain RO-1 that can grow under alkaline pH was also isolated from corroded concrete and identified as Thiobacillus versultus. Since strain RO-1 exuded Ca^<2+> from concrete blocks added to thiosulfate medium with pH 9.0, suggesting that strain RO-1 is involved in the early stage of concrete corrosion because concrete structures just after construction contain calcium hydroxide and have a pH of 12-13. Thirty-six strains of iron-oxidizing bacteria were isolated from corroded concrete samples obtained at eight sewage treatment plants in Japan. Since not only T.thiooxidans but also T.ferrooxidans can oxidize reduced sulfur compunds and produce sulfuric acid, author first suggested that T.ferrooxidans as well as T.thiooxidans is involved in concrete corrosion. Portland cement bars (4×4×16 cm) containing nickel and tungsten were prepared and these bars were hung from the lid of the a sludge tank manhole and exposed to 5〜80 ppm hydrogen sulfide atmosphere for 1〜5.5 years. It was found that the surface of the portland cement containing nickel and tungsten was especially smooth, while that without these heavy metals was brittle and rough. From the results, author first suggested that nickel and tungsten are useful as antimicrobial reagents to protect concrete corrosion.

从污水处理厂腐蚀混凝土中分离到一株嗜酸硫氧化细菌NB 1 -3，经鉴定为氧化硫硫硫杆菌。菌株NB 1 -3在含硫培养基中的生长不仅受到镍的强烈抑制，而且受到钨的强烈抑制。发现镍和钨结合到菌株NB 1 -3的质膜上，并抑制参与能量产生的酶、硫双加氧酶和亚硫酸盐氧化酶，从而抑制细胞生长。从腐蚀混凝土中分离到一株能在碱性条件下生长的硫氧化细菌RO-1，经鉴定为多硫杆菌（Thiobacillus versultus）。由于菌株RO-1从加入到pH 9.0的硫代硫酸盐介质中的混凝土块中渗出Ca^<2+>，这表明菌株RO-1参与了混凝土腐蚀的早期阶段，因为刚刚建造的混凝土结构含有氢氧化钙，pH值为12-13。从日本8个污水处理厂的腐蚀混凝土样品中分离出36株铁氧化细菌。由于氧化硫杆菌和氧化亚铁杆菌都能氧化还原态硫化合物产生硫酸，作者首次提出氧化亚铁杆菌和氧化硫杆菌都参与了混凝土的腐蚀。制备含有镍和钨的波特兰水泥棒（4×4×16 cm），将这些棒悬挂在污泥罐人孔的盖子上，并暴露于5 × 80 ppm硫化氢气氛中1 × 5.5年。结果表明，含镍和钨的波特兰水泥表面特别光滑，而不含这些重金属的硅酸盐水泥则脆而粗糙。从结果来看，作者首先提出镍和钨可以作为抗菌剂来保护混凝土腐蚀。