Pollution of coastal sea water and sulfate reducing bacteria in connection with microbial corrosion of metallic materials in desalination plants
✍ Scribed by Toro Nakahara; Hidetsugu Sasaki; Yukio Kanda; Hideo Togano
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 547 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0011-9164
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✦ Synopsis
The qualities of sea water and bottom sedinent in Tokyo Bay were investigated in relation to the activity of sulfate reducing bacteria. Higher concentration of organic substance and larger nunber of the bacteria were observed in surface layer than in bottom layer of the sea water influenced by polluted rivers. This result reveals that polluted river L'ater spreads widely in surface layer of the sea, and that the bacteria grown in bottom sedinent near the estuaries are carried in with the flowing water. In the sedinant greater nmber of the bacteria and considerably higher organic content here found than in the sea. Anaerobic incubation tests of the sedinent resulted in generation of hydrogen sulfide, which revealed that botton sediment itself possessed enough content of organic substance and variety of bacterial flora to generate hydrogen sulfide. It foliows that, in the operation of desalination plants using polluted water, quite natural attension that botton sedinent must not be taken in, proved to have ?m?o*-an: mt;o:i~r~ Zor the prevcr.tfor. ef ~5r-7~'n' =o'_osioa. INlRODUCTION Marine pollution has become severe enough to cause "red tide" in polluted seas such as in Tokyo Bay. When these polluted waters are used as cooling water or feed water of desalination plants. we c!ust consider the dangers of growing sulfate reducing bacteria. which utilize pollutant as nutrient, generate hydrogen sulfide and result in accelerated corrosion of metallic naterials. Especially in the case of desalination plants, deaeration itself, whose main object is to decrease in corrosion, offers favourable circumstance to the anaerobic sulfate reducing bacteria. The object of this report is to clarify the following points. in view of the cosxlition that we oust construct desalination plants on the seaside influenced by the mmicipal wastes: