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Murali M.,Aditya Institute of Technology and Management Autonomous
Indian Journal of Environmental Protection | Year: 2015

Several methods of treatment have been suggested for removal of chromium from wastewaters which include chemical precipitation, reverse osmosis, ion exchange, foam formation. etc. The main disadvantages of the above processes are they produce large amounts of sludge and there are no possibilities of metal recovery and are very costly also. The use of plants and-other plant materials for the removal of the heavy metals have already been reported in the literature as the non-conventional adsorbents. In the present work, an attempt has been made to compare the efficiency of removal of chromium using conventional and non-conventional adsorbents. Effluent from an electroplating industry was collected and analyzed for pH value, acidity, suspended solid, dissolved solid and chromium. Batch experiments were conducted using the diluted effluent to facilitate the comparison of the results with control sample. Hibiscus Mutabulis (commonly known as hibiscus plant) leaves were collected locally and these leaves were dried, powdered and sieved through standard sieve (I.S. no. 0.075 mm). The first stage of batch experiments were carried out using this sieved leaf powder. The second stages of experiments were carried out using commercially available activated charcoal. Variation of chromium removal with contact period and dosage of adsorbent is studied using Freundlich plots. ©2015 - Kalpana Corporation.


Murali M.,Aditya Institute of Technology and Management Autonomous
Nature Environment and Pollution Technology | Year: 2016

Several methods of treatment have been suggested for removal of chromium from wastewaters which include chemical precipitation, reverse osmosis, ion exchange, foam formation, etc. The main disadvantages of the above processes are that they produce large amounts of sludge and there are no possibilities of metal recovery as they are very costly. The use of plants and other plant materials for the removal of the heavy metals has already been reported in the literature as the non-conventional adsorbents. In the present work, an attempt has been made to study the efficiency of removal of chromium using non-conventional adsorbents. Effluent from an electroplating industry was collected and analysed for pH value, acidity, suspended soils, dissolved solids and chromium. Batch experiments were conducted using the diluted effluent to facilitate the comparison of the results with control sample. Hibiscus mutabilis (commonly known as hibiscus plant) leaves were collected locally and were dried, powdered and sieved through standard sieve (I.S. no. 0.075mm). Batch experiments were carried out using this sieved leaf powder. Variation of chromium removal with contact period and dosage of adsorbent is studied using Freundlich plots.

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