Can I use waste vegetable oil (“WVO”) from restaurant fryers?
Yes, WVO can be used in our system. We consider Canola (one variety of rapeseed, and commonly used as a cooking oil) to be one of the best, and certainly there has been more research on this oil for SVO use than others, since it is grown in Germany, where there is more SVO activity than anywhere else. The principle is that the oil to be used needs to be liquid enough to pour, at the ambient temperature you intend to use it. The oil can be “as thick as thick gravy, without needing a tank heater”. An oil that is lower on the scale of Iodine Values is certainly best. If the oil is higher iodine value, and higher FFA (such as used soybean oil) it is advisable to keep looking for a source of good Canola oil, or buy new Canola (rapeseed oil is essentially the same for fuel use) oil and blend 50/50. It is necessary to have an oil that will resist oxidation and polymerization. Oil should be collected and used as soon as possible after use in a fryer, and it should be kept sealed to minimize ex
