Dewater

In the 20ᵗʰ century, when the mechanical separation of impurities based upon specific gravity separations and the removal of fine coal particles which are difficult to handle and dewater became the technology of choice, the bituminous coal mining industry produced vast quantities of both gob and fines.

The starting feedstock (i.e., pineapple peel) for producing biochar and activated carbon was collected from a local market (Chienchen district, Kaohsiung, Taiwan). It was first dewatered in the sun and further dried in the air-circulating oven at 105 °C.