The probability criteria are debatable. Some area Classifying Equipment investigators have suggested associating the probabilities to the existence of the lower explosion level (LEL) of the gaseous atmospheres.

Allocating the probabilities to the existence of the releases has also been advanced. These probability concepts will be very difficult or expensive to verify.

Several methods based on pyrometallurgy and hydrometallurgy are currently used for the recovery of metals from waste PCBs. Pyrometallurgical processes require heating the waste EEE at high temperatures to recover valuable metals. These treatments lead to the production of hazardous gases that must be removed from the air with flue gas cleaning systems. These processes are energy intensive and high-cost and require high-grade (rich in copper and precious metals) feeds. The formation of dioxins and furans is unavoidable due to the use of halogenated flame retardants, which presents environmental problems; thus, off-gas treatment is a prerequisite. Compared with pyrometallurgical processes, Hydrometallurgy Equipment processes offer a relatively low capital cost, reduced environmental impact and high metal recoveries.

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