Synergism of Pseudomonas aeruginosa and Fe0 for treatment of heavy metal contaminated effluents using small scale laboratory reactor

In this study Pseudomonas aeruginosa a metal tolerant strain was not only applied for heavy metal removal but also to the solublization performance of the precipitated metal ions during effluent treatment. The synergistic effect of the isolate and Fe0 enhanced the metal removal potential to 72.97% and 87.63% for Cr(VI) and cadmium, respectively. The decrease in cadmium ion removal to 43.65% (aeration + stirring reactors), 21.33% (aerated reactors), and 18.95% (without aerated + without stirring) with an increase in incubation period not only indicate the presence of soluble less toxic complexes, but also help in exploration of the balancing potential for valuable metal recovery. A relatively best fit and significant values of the correlation coefficient 0.912, 0.959, and 0.9314 for mixed effluent (Paint Industry effluent + CETP Wazirpur, effluent), CETP, Wazirpur, and control effluents, respectively, indicating first-order formulation and provide a reasonable description of COD kinetic data.

► It shows the feasibility of developing microbial bioremediation technology. ► Present work help in the identification of the opportunity of the effluent treatment in the industrial complexes. ► Scale up demonstration of small scale laboratory reactor to industrial scale reactor for industrial effluent treatment. ► This study leads towards the development microbial technology for precocious metals recovery from the waste stream.