Research on Oil Adsorption Capacity of Carbonized Material Derived from Agricultural by-product (Cor Cob, Corn Stalk, Rice Husk) Using in Oily Wastewater Treatment
Oily wastewater discharged from machinery producing, mining, storage service, marine
transporting... is one of the polluting sources to receiving waterbody. Adsorption onto carbonized
material derived from agricultural by-products are proved to be the promising treatment for this
type of wastewater. Experiments implemented with the agro-wastes including: corn cob, corn stalk
and rice husk with carbonizing temperature of 300-600 oC and retention time of 1-3h. According to
the results of all carbonized materials, the decrease of oil adsorption accosiated with higher
pyrolysis temperature, as well as longer retention duration. Under the same carbonizing conditions,
the carbon derived from corn stalk have the higher adsorption capacity. The highest oil sorption
capacity of 6.4 g/g is of corn stalk derived carbon with temperature of 300 oC, retention time of 1h;
while the lowest one of 2.33 g/g is of material derived corn cob with temperature of 600 oC, 1h.
The oil adsorption capacity is closely related to the porosity and oleophilic groups on the surface
of the material. The results indicated that materials made from agricultural by-products, corn stalk
in particular, are promising for oily wastewater treatment.