Vol. 3, Issue 5 (2016)
Impact of mercury and its removal from contaminated environment by biological agents
Author(s): Deoraj Sharma, Purna Chandra Mahapatra, Ashok Kr. Panigrahi, Alka Sahu
Abstract: The present study was designed to study the impact of mercury contained effluent of chlor-alkali industry on Cyanobacteria, certain aquatic plants and the possible detoxification by Cyanobacteria in the environment. Different concentration of the effluent was prepared and homogeneous suspension of Cyanobacteria i.e Westiellopsis Prolifica Janet and certain aquatic plants were inoculated to find out the growth and decontamination of mercury contaminated effluent. It was found that at higher concentration (i.e. 3.8% Hg) bleaching of the filament was marked and at lower concentration (i.e.0.45%) stimulation of growth was observed. Inhibition of growth was also recorded at higher concentration of mercury where as Insignificant stimulation of growth have been recorded at low concentration. Similarly increase in chlorophyll content was recorded at lower concentration whereas decrease in chlorophyll content was marked at higher concentration. Photosynthetic rate was also increased at lower concentration and it was decreased at higher concentration as compared to the control value. During the experiment it has been observed that Cyanobacteria can absorb and releases the mercury into the environment from mercury contaminated effluent.