You will notice that in the Cut-off database, the process used for waste wood, post consumer has almost no impacts. That is because it is actually viewed as a co-product, that can be used in other productions. As such it follows the rule of cut-off, and all environmental impacts from the previous life has been cut off.
I suspect the waste treatment for the product flow for APOS represents a similar flow, but with some allocation.
If you are looking for a waste disposal process, i would recommend looking for the waste flow "waste wood" and choose either a market process for waste wood, or a treatment process for waste wood, such as "incineration of waste wood".
I hope this helps