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STUDIES ON THE REMOVAL OF HEXAVALENT CHROMIUM FROM INDUSTRIAL WASTEWATER BY USING BIOMATERIALS

ABSTRACT Chromium (VI) is one of the highly toxic ions released into the environment through leather processing and chrome plating industries. There are a number of methods available for the removal of Cr (VI) from industrial wastewater. In recent years, cyanobacteria were used as bioadsorbent for the removal of certain heavy metals. However, most of the conventional methods generate secondary effluent impacts on the recipient environment. The aim of the present investigation is to develop a suitable phytoremediation technology for the procumbens removal of Cr (VI) in industrial wastewater. In the present research work, a novel biomaterial, Tridax (Asteraceae), a medicinal plant was used as a bioadsorbent. The optimum pH of the experimental solution was 2.5 and batch experiments were performed. The efficiency of the activated carbon of the biomaterials for Cr (VI) removal was evaluated by studying the contact time, quantity of adsorbent and concentration of Cr (VI). The result of the present study showed that, 97 percent Cr (VI) removal in synthetic wastewater sample was achieved when 5g of the bioadsorbent was used. This method is also applied to the removal of Cr (VI) from tannery industry wastewater.. Hence, it is recommended that, this bioremediation technology is a cleaner and useful methodology for the removal of Cr (VI) from the industrial wastewater. KEYWORDS Phytoremediation technology, hexavalent chromium, biomaterials and Industrial wastewater.

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    ABSTRACT: Tridax procumbens Linn. (Compositae) is a weed found throughout India. The plant is native of tropical America and naturalized in tropical Africa, Asia, and Australia. Local people known it as "Ghamara", in English popularly called 'coat buttons' and is dispensed for "Bhringraj" by some of the practitioners of Ayurveda. The phytochemical screening revealed the presence of alkaloids, carotenoids, flavonoids (catechins and flavones), fumaric acid, fl-sitosterol, saponins and tannins. It is richly endowed with carotenoids, saponins, oleanolic acid and ions like sodium, potassium and calcium. Luteolin, glucoluteolin, quercetin and isoquercetin have been reported from its flowers. It has known for its number of pharmacological activities like hepatoprotective activity, antiinflammatory, wound healing, antidiabetic activity, hypotensive effect, immunomodulating property, bronchial catarrh, dysentery, diarrhoea and to prevent falling of hair promotes the growth of hair, and antimicrobial activity against both gram-positive and gram-negative bacteria. The leaf juice possesses antiseptic, insecticidal and parasiticidal properties, as a remedy against conjunctivitis and is used also to check haemorrhage from cuts, bruises and wounds insect repellent. It is also used as bioadsorbent for chromium (VI). This review focus on folk occurrence and the wide pharmacological activities of weed Tridax procumbens.
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    ABSTRACT: The effective removal of heavy metals from industrial wastewater is among the most important issues for many industrialized countries. Removal of lead(II) and cadmium(II) from aqueous solutions were studied using Tridax procumbens (Asteraceae). Batch adsorption experiments were performed as a function of pH, contact time, solute concentration and adsorbent dose. The optimum pH required for maximum adsorption was found to be 4.5 and 4.8 for lead and cadmium, respectively. The maximum contact time for the equilibrium condition is 180 min at the sorbent dose rate of 2.5 g. The maximum efficiencies of lead and cadmium removal by biocarbon were 95% and 98%, respectively. The results were well fitted by both Langmuir and Freundlich isotherm models.
    ScienceAsia 01/2011; 37115(37-doi: 10.2306/scienceasia1513-1874.2011.37.115):115-119. · 0.40 Impact Factor

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Jun 6, 2014