What is a commercial waste disposal method for waste solvents?

The reasoning behind the answer is that all the listed methods—incineration, purification by distillation, and purification by filtration—are viable commercial waste disposal methods for waste solvents.

Incineration involves burning the waste materials at high temperatures, which not only effectively reduces the volume of the waste but also destroys hazardous components. This method is particularly useful for solvents that may be too volatile or toxic for landfilling.

Purification by distillation is a technique that can recover and separate solvents from waste for reuse. This method is beneficial in environmental management as it minimizes waste by allowing the recovery of useful solvents while reducing the need for new solvents.

Purification by filtration can remove solids and particulates from waste solvents, thus making them safer for disposal or even allowing for the recycling of the filtered solvents.

Since each of these methods addresses the disposal or recovery of waste solvents in different and effective ways, the choice indicating that all methods are viable is accurate.