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硫酸盐还原菌和铁细菌是供水系统中影响管材腐蚀的主要微生物,从供水管线中提取这两种微生物,通过对样片的腐蚀情况分析获得微生物的生长曲线及相应的腐蚀速率。结果发现,两种微生物的生长曲线都在第3天和第4天后趋于稳定,不同于二者共存时的结果。在35℃时,铁细菌数量增长最快。浸泡在微生物中样片的腐蚀速率明显大于浸泡在灭菌水中的腐蚀速率。硫酸盐还原菌对铸铁腐蚀的影响最大,两种微生物混合时,样片的腐蚀速率最小,说明当硫酸盐还原菌和铁细菌共存时,铸铁管材的腐蚀过程受到抑制。在不同介质中浸泡过的铸铁样片,其腐蚀电位也存在较大差异。
Sulfate reducing bacteria and iron bacteria are the main microorganisms that affect pipe corrosion in the water supply system. The two microorganisms are extracted from the water supply pipelines, and the growth curves and the corresponding corrosion rates of the microorganisms are obtained by analyzing the corrosion status of the samples. As a result, it was found that the growth curves of both microorganisms tended to be stable on the 3rd and 4th days, unlike the results when they both coexisted. At 35 ℃, the number of iron bacteria increased fastest. The rate of corrosion of swatches soaked in microorganisms is significantly greater than the rate of immersion in sterile water. Sulfate-reducing bacteria had the most significant effect on the corrosion of cast iron. When the two microorganisms were mixed, the corrosion rate of the sample was the smallest, indicating that the corrosion process of the cast-iron pipe was inhibited when the sulfate-reducing bacteria co-existed with the iron bacteria. In different media soaked cast iron samples, the corrosion potential there is a big difference.