Activated Carbon from Solid Waste of Pulp and Paper Industry and the Study of Color Removal of Wastewater
This research aimed to study the preparation of activated carbon from pulp residue, solid wastes from pulp and paper industry, by chemical activation with phosphoric acid (H3PO4) and physical activation with carbon dioxide (CO2). For H3PO4 activation, the calculated BET surface area of chemical activated carbon is 408–728 m2/g at the weight ratio of raw material to chemical 1:2–1:4, activation time 1 hr and carbonization temperatures of 400–600oC for 1 hr, while that of physical activated carbon drastically reduced to 14–57 m2/g at carbonization temperature of 400oC for 1 hr and activation temperature ranging from 600–800oC for 0.5–3 hrs. By investigating the equilibrium color adsorption capacity from bio-treated wastewater of pulp and paper industry by loading chemical and commercial activated carbon, as expected, it is found that the performance of color removal becomes higher as increasing the adsorbent loading. A 1.5 g of chemical activated carbon provided the highest color removal about 97%. In order to meet the industry-specific requirement for color removal of 58%, we found that our prepared activated carbon spent less time consuming (40 minutes) to remove color than the commercial one about 3 times, approximately. For further investigations of ADMI color and pH of wastewater after treatment with our chemical activated carbon, those measured values are acceptable. Therefore, we recommend that the activated carbon prepared by chemical activation be appropriate to be applied in the pulp and paper industry because of high adsorption rate and capacity, and recycling waste into useful products.
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