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The new D-value for 160 °C given the z-value is 0.45 minutes. This means that each 10 °C (18 °F) increase in temperature will reduce our D-value by 1 log. Conversely, a 10 °C (18 °F) decrease in temperature will increase our D-value by 1 log. So, the D-value for a temperature of 140 °C would be 45 minutes.
Once the tank is full of effluent, high-temperature pressurised steam is passed through the cavity in the walls of jacketed vessel, raising its temperature of over 121 °C. Once all the effluent has been heated to at least 121 °C for at least 30 minutes, all biologically hazardous material within the kill tank will have been sterilised. [ 6 ]
Dry decontamination is a relatively recent method of decontamination and is especially useful in cold weather conditions, [2] or when water is scarce or difficult to transport. Dry decontamination reduces the size and manpower requirements of the decontamination line and eliminates the need to purchase excess equipment that becomes ineffective ...
It is also a form of decontamination, and can be defined as the process whereby physical or chemical methods are used to reduce the amount of pathogenic microorganisms on a surface. [ 2 ] [ 3 ] Disinfectants can also be used to destroy microorganisms on the skin and mucous membrane, as in the medical dictionary historically the word simply ...
Pressure cooking and canning is analogous to autoclaving, and when performed correctly renders food sterile. [18] [failed verification] To sterilize waste materials that are chiefly composed of liquid, a purpose-built effluent decontamination system can be utilized. These devices can function using a variety of sterilants, although using heat ...
Fumigation of hospital rooms with high concentrations of toxic chemicals has been proposed to reduce microbial agents on hospital surfaces and to control surgical site infections. [4] Formaldehyde fumigation has long been an accepted method for areas where microbiological cleanliness is required.
In microbiology, in the context of a sterilization procedure, the D-value or decimal reduction time (or decimal reduction dose) is the time (or dose of an antimicrobial drug) required, at a given condition (e.g. temperature) or set of conditions, to achieve a one-log reduction, that is, to kill 90% of relevant microorganisms. [1]
The D-value at an unknown temperature can be calculated knowing the D-value at a given temperature provided the Z-value is known. The target of reduction in canning is the 12- D reduction of C. botulinum, which means that processing time will reduce the amount of this bacteria by a factor of 10 12 .