No. UV treatment does not alter the water chemically. Only energy is added, which produces heat, resulting in a temperature rise in the treated water/wvo. Actually UV radiation must strike the organism to kill it. In this process some of the radiation energy is absorbed by the organism and other constituents in the medium surrounding the organisms. So if sufficient dosage of UV reach the organisms water/wvo can be disinfected. The germicidal effect of UV energy is said to be associated with its absorption by certain organic components essential for the functioning of cells. Dissipation of energy by excitation causes disruption of unsaturated bonds, particularly of the purines and pyrimidines, and this leads to lethal biochemical changes in the micro-organisms. However, I'm not sure of how UV would act on wvo (especially its property of disrupting the unsaturated bonds should be considered here). Kavitha. kirk <[EMAIL PROTECTED]> wrote:I suspect the uv will promote chemical reactions.
Kirk -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Friday, February 14, 2003 8:07 PM To: biofuel@yahoogroups.com Cc: [EMAIL PROTECTED] Subject: [biofuel] stockpiling wvo As has been described, wvo becomes rancid after a short time in storage at room temperature. This deterioration prevents it from being stockpiled for long periods. The deterioration, I presume, is the result of bacteria buildup with time. In water treatment, a uv lamp can be used effectively to remove coliform bacteria, by placing the uv lamp in the line through which the water is drawn for use. Why couldn't bacteria in wvo be removed by similar uf treatment? This could be done continuously, or semi continuously, by pumping a small stream of wvo from the tank, drawing it from the tank bottom with a small submersible pump and allowing the uv treated wvo to drop back into the top of the tank. Assume a 1000 gal tank. Alternatively, the wvo stream could be heated and returned to the tank. Any idea of what temperature and for how long the residence time through the heater? Or would both heating and uv treatment be required? Comments? Glenn Ellis Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuels list archives: http://archive.nnytech.net/ Please do NOT send Unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ --------------------------------- Do you Yahoo!? Yahoo! Shopping - Send Flowers for Valentine's Day [Non-text portions of this message have been removed] Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuels list archives: http://archive.nnytech.net/ Please do NOT send Unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
