Microbial hazard of waterborne metalworking fluid
There are many types of microbes in jet fuel, which can be divided into three categories.
1. Fungi: Hormoconis resinae, Paecilomyces Varioti (Aspergillus Fumigatus), and the like.
2. Bacteria: Pseu-domonas, Vibrio, Bacillus, Sulfate Reducing Bacteria, and the like.
3. Yeast: Rhodotorula, Candida, Tomlopsis, etc.
Comprehensive domestic and international research found that the most serious impact on the quality and storage of jet fuel is mainly Hormoconis resinae and SulfateReducing Bacteria.
1.1 Cladosporium
Cladosporium is one of the first fungi isolated from oil contaminants and the most common fungus. It mainly uses hydrocarbons with a carbon chain length of 8-20 in the oil as a carbon source. Cladosporium can produce spores in oils, and these spores can survive for several years in an anhydrous environment. Studies have shown that Cladosporium can survive in fuel by only requiring free water at a concentration of 80X10 -6 in 25 parts. The optimum temperature for the growth of Cladosporium is 25~30 Co, and the optimum pH is 3.5~6. On agar medium, the color of Cladosporium colonies ranges from light brown to grayish brown to olive green. In jet fuels with more serious microbial contamination, the isolated microbial fungi are mainly cladosporium and jet fuel suspended solids. The relationship between fungi and fungi was studied and it was found that Cladosporium is one of the important causes of jet fuel suspension.
1.2 sulfate reducing bacteria
Sulfate Reducing Bacteria is a wide variety and widely distributed in nature. It is a general term for such bacteria that can reduce sulfur oxides and elemental sulfur to hydrogen sulfide. Sulfate-reducing bacteria are mainly present in the aqueous phase as well as in the bottom sludge, which is basically an anaerobic bacterium. Hector F. et al. used 16rRNA technology to study sulfate-reducing strains, and classified sulfate-reducing bacteria into four categories: Gram-negative bacteria, Gram-positive bacteria, thermophilic bacteria, and thermophilic archaea. Sulfate-reducing bacteria are suitable for pH 5-9, and 30Co is generally considered to be the optimum temperature. Studies have found that hydrogen sulfide produced by the metabolism of sulfate-reducing bacteria increases the acidity of the oil, which not only reduces the quality of jet fuel, but also corrodes the oil pipeline and the metal wall of the tank, posing a serious threat to oil storage safety. In addition, studies have found that sulfides produced by sulfate-reducing bacteria can also corrode aircraft-containing silver components, posing an unpredictable risk to flight safety. A survey conducted by the United States in 1991 showed that the annual corrosion loss caused by sulfate-reducing bacteria reached $6 billion.
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