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The search for a more cost effective, environmentally friendly and less cumbersome process of regenerating used activated carbon in a petroleum polluted site necessitated this research work. Spent Granular Activated Carbon was regenerated having been initially characterized using cultured Pseudomonas Putida. The rate of Bioregeneration was studied by varying the volume of bacteria from 10ml, 20ml, 30ml and 40ml. The regeneration temperature was also varied from 25C to ambient temperature of 27C, 35C and further at 40 and 45C over a period of 21 days. The regeneration experiment improved as the quantity of bacteria used increased. Increasing the temperature of regeneration also increased the rate of regeneration due to chemisorptions action. There was no significant improvement when the temperature was increased to 45C suggesting that increasing temperature beyond 40C would not be economical. The regenerated GAC was characterized to determine efficiency of regeneration. Bioregeneration was impacted by variation in temperature and bacteria volume. Bioregeneration spent Granular Activated Carbon is shown by the study to be an effective and cost efficient way to remediate polluted soil and still reuse the adsorbent.

Experimental Studies on Bioregeneration of Activated Carbon Contaminated With Hydrocarbon