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Year: 2017, Issue: December

Possible reclamation of solid waste of a chlor-alkali industry by BGA and phytoremediation by plant extract under controlled conditions.


Jhilli Prabha Prusti and A. K. Panigrahi


Reclamation, BGA, Solid waste, Chlor-alkali industry, Phytoremediation, Plant extract

The present piece of work deals with major aspects of mercurial pollution by a chlor-alkali industry. The present piece of work was designed to study the effect of the Neem and Jatropha extract on the Solid Waste Extract (SWE) and amended SWE of a chlor-alkali industry on the blue-green alga, Westiellopsis prolifica, Janet and to find out a possible use of plant extracts (secondary metabolites) for reclamation of SWE and ASWE of the chlor-alkali industry. A graded series of concentrations of the SWE and amended SWE was prepared and a pure culture of the alga, Westiellopsis prolifica, Janet was inoculated to find out percent survival. From this, the lethal concentration values were determined. The below three concentrations were selected- SWE LC00 =0.1 m 50 ml culture; SWE LC10 =0.2 ml/0ml culture; SWE LC50 =0.3 ml/50 ml culture and ASWE LC00 =0.1 ml/50ml culture; ASWE LC10 =0.2 ml/50 ml culture; ASWE LC50 =0.3 ml/50 ml culture for future experiments. No significant visible morphometric change was no- 50 ticed in the exposed BGA. At higher concentrations of the SWE and ASWE, bleaching of the filaments was marked. In other sets no bleaching was marked. Stimulation of growth was marked at lower concentration of the toxicant, as all growth parameters showed higher values, when compared to the control value. The data indicated that during 15th days of exposure, growth was restricted and all the pigments disappeared in the SWE and ASWE standard control without application any extract, might be due to disintegration of the pigments in the tubes. The optical density value showed normal growth in the control set. No significant trend was recorded. The OD and dry weight data showed increase in plant leaf extract applied cultures when compared to control as observed was indicative as non-parameter to assess toxicity. Significant increase in chlorophyll content was recorded in exposed cultures where plant leaf extract was applied when compared to the control value was marked. Significant increase in phaeophytin content was recorded in plant leaf extract treatment, when compared to the control value and pure line waste treatment. Carotenoid content showed a similar trend as observed in case of chlorophyll and phaeophytin content change. The changes noted in phycocyanin, phycoerythrin and allophycocyanin content indicated that the plant leaf extract detoxifies the mercury contaminated wastes, the wastes might be the solid waste or SWE or ASWE or effluent. From the present experiment, it can be concluded that the cyanobacterium, Neem and Jatropha plant leaf extract can be applied in combination to the mercury contaminated wastes for total reclamation or detoxification.

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