Environmental factors that affect fuel system microbial growth. by Elaine McFarlane
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1 Environmental factors that affect fuel system microbial growth by Elaine McFarlane
2 Contents 1. High distillation temperatures ensure fuel sterility 2. Bulk refinery storage presents the first opportunity for microbial growth 3. Microbes can also grow during fuel transportation 4. Main factors affecting microbial growth 5. Effect of nutrient availability 6. Effect of oxygen availability 7. Effect of temperature 8. Effect of water availability 9. Adopting good housekeeping practices to reduce microbial growth
3 High distillation temperatures ensure fuel sterility Crude oil distillation Diesel fuel s a mixture of hundreds of different hydrocarbons boiling between about 180 C to 380 C, with carbon chain lengths of around C9 to C20. As well as C & H, it consists of S, N, O & other trace elements. S can be stripped out by heat treatment under pressure with H. High distillation temperatures ensure fuel sterility, but when it is transferred into bulk refinery storage there is potential for microbial problems to develop.
4 Bulk refinery storage presents the first opportunity for microbial growth Boroscope Video Chesneau, H.L. & Dorris, M.M. (Eds.) (1988) Distillate Fuel: Contamination, Storage, and Handling, ASTM.
5 Microbes can grow during fuel transportation Example supply & distribution chain Sequencing and interface management with multi-product pipelines. Allowance of sufficient settling time for contaminants to sink to the bottom of storage tanks. Where practical, tanks are engineered with low points or sumps to facilitate drainage of water and contaminants. Dedicated compartments (ships, road and rail) to avoid grade contamination. To ensure that fuel is delivered clean, dry and free from contamination to the customer, a range of measures are taken. Filtration. Sampling and testing for visual appearance, density, etc.
6 Microbes can grow during fuel transportation Dirty Diesel Video Biomass at the fuel/water interface Biomass clogging a filter
7 Main factors affecting growth Time Lapse Video Nutrient availability Oxygen availabilty Temperature Water availability ph Osmotic pressure Salinity Some reports suggest that biodiesel does not necessarily increase microbial growth. Implications of biofuels on microbial spoilage and corrosion within the fuel distribution chain and end use, (2008) Energy Institute. Susceptibility to microbial growth can also vary with FAME content.
8 Effect of nutrient availability on microbial growth Macro-nutrients Carbon (energy source, cell material) Hydrogen (cell water) Oxygen (cell water) Nitrogen (proteins, enzymes) Sulphur (enzymes) Phosphorus (membranes, ATP) Micro-nutrients Trace elements (calcium, sodium, potassium, iron, magnesium, manganese, copper, cobalt, nickel)
9 Effect of oxygen availability on microbial growth Aerobic environment free oxygen (O 2 ) present Anaerobic environment lack of free oxygen, but contains atomic oxygen (nitrate NO 3, nitrite NO 2, sulphite SO 3 ) Facultative microbes can switch between aerobic and anaerobic systems filamentous fungi yeast SRB
10 Effect of temperature on microbial growth Microbes are generally classified into three groups depending on their temperature requirements: Psychrophiles Mesophiles Thermophiles grow optimally ~0-5 C grow optimally ~15-35 C grow optimally ~ >55 C Aspergillus fumigatus
11 Effect of water availability on microbial growth To a microbe, a one millimetre film of water is the same as a six foot person standing in 1,500 feet of water Howard Chesneau, President of Fuel Quality Services Inc. Microbes require free, chemically unbound water for cellular activity. Water activity (a w ) is a measure of the amount of free water present and is the ratio of water vapour pressure over the sample (P) to that over pure water(p 0 ). a w = P/P 0 a w pure water = 1.0 a w honey = 0.6 Most bacteria require a w = >0.95 Most moulds require a w = >0.80 Most yeasts require a w = >0.85
12 Adopt good housekeeping to reduce microbial growth Water is always present because: Dissolved water in the fuel condenses on the tank walls. Moisture in the air can enter through floating tank lids. Efficient tank draining is not always possible. Water may be added as ballast (on ships) or to purge the delivery system. Good housekeeping procedures that eliminate water as much as possible WILL reduce microbial growth
13 Q & As?
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