Sludge Palm Oil (SPO) is a byproduct that forms during the production of crude palm oil (CPO). It is collected from the bottom layers of settling tanks and separators in palm oil mills, where leftover oil, water, and solids accumulate during the refining process. However, it holds commercial value in several non-food industries.
In addition, SPO can be processed for use in industrial lubricants and greases, especially in applications where biodegradability is preferred. In limited and carefully treated forms.