TECHNIQUE FOR TREATING WASTEWATER WITH LOCALLY MODIFIED ADSORBENT
This work details the techniques for heavy metal removal from wastewater using modified adsorbent. An aqueous wastewater sample at standard atmospheric condition and neutral pH from an oil and gas facility effluent section containing amongst other organic and inorganic contaminants was treated. An adsorbent locally produced in the course of this work from a 2000g of dry empty oil palm bunch (DEOPB), an agricultural waste material obtained from a local oil palm processing mill was used to treat the effluent. The adsorbent was subjected to pyrolysis and chemically activated using a 0.1mol hydrochloric acid (HCl). The adsorption behaviors of iron, copper and cadmium were found to obey Pseudo Second Order kinetic model and the Langmuir isotherm model was used to fit the iron, copper and cadmium adsorption isotherm onto the DEOPB activated carbon with their equilibrium capacities agreeing with experimental data except for the lead component that showed no effect. The heavy metals contaminants investigated using this technique was found to have been removed from the wastewater stream in the following percentage removals; iron; 57%, copper; 99.6% and cadmium; 90% but was ineffective in the removal of the lead component as its concentration remained unchanged throughout the experiment. The locally produced activated carbon was subjected to laboratory analysis and its properties (Density; 0.369g/m3, Particle Size; 0.18mm, Ash Content; 5.73%ww, Porosity; 90%, Surface Area; 691 m2/g) was found to favorably compare with commercial activated carbon.