Kalaichelvan G

Department of Biotechnology

School of Bio Sciences and Technology

Vellore Campus

Mohan Annamalai

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Environmental Chemistry Letters

The present study focuses on recovery of heavy metals from e-waste fungus isolated from heavy metal rich industrial sewage soil. Molecular identification revealed the organism to be Aspergillus nomius and was designated as A. nomius JAMK1. The isolate was subjected for heavy metals uptake following two mechanisms: bioaccumulation and biosorption. Atomic absorption spectroscopy (AAS) was primarily used to analyse the heavy metal ions uptake and further confirmed by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDAX). Kinetics study was performed using pseudo-first-order, pseudo-second-order, Elovich, Weber and Morris and Boyd’s kinetic model. Central composite design, a subunit of response surface methodology, was utilized to obtain design of experiments for the experimental values in bioaccumulation. Adsorption isotherm assessment, conducted for the biosorption activity of strain JAMK1, showed that the process followed Freundlich mode of isotherm. The adsorbed heavy metals were comprehensively desorbed from the metal-loaded sorbent using HCl and Ca(OH)2. The activity of A. nomius JAMK1 in bioleaching of metals from spent batteries was studied and analysed using AAS, X-ray diffraction, SEM and EDAX. The investigation proved A. nomius JAMK1 to be a potential strain for heavy metals uptake from aqueous solution as well as electronic waste. © 2019, Islamic Azad University (IAU).

International Journal of Environmental Science and Technology

Bioleaching of heavy metals from spent batteries using Aspergillus nomius JAMK1

Preliminary studies were performed to demonstrate a 'value from waste' concept for recovering polyphenols from waste Tamarindus indica L. by solvent extraction assisted by microwaves and/or ultrasound. To aid formulation of process guidelines, the influence of precursor size, microwave power, ultrasonication intensity and time were investigated. It was found that extract from tamarind shells contained (-)-epicatechin although the seed coat allowed for higher extraction. An optimum extract yield of 62.35 mg and 60.45 mg (per 100 g of dry solid) were obtained for microwave (180 W) and ultrasonication (intensity: 40%) pre-treatment of tamarind seeds of 0.2 mm size using ethanol. © 2017 Elsevier Ltd.

Materials Today: Proceedings

Preliminary isolation, recovery and characterization of polyphenols from waste Tamarindus indica L.

Electronic waste or e-waste is one of the emerging problems in developed and developing countries worldwide. It comprises of a multitude of components with valuable materials, some containing toxic substances, that can have an adverse impact on human health and the environment. Previous studies show that India has generated 0.4 million tons of e-waste in 2010 which may increase to 0.5 to 0.6 million tons by 2013-2014. Coupled with lack of appropriate infrastructural facilities and procedures for its disposal and recycling have posed significant importance for e-waste management in India. In general, e-waste is generated through recycling of e-waste and also from dumping of these wastes from other countries. More of these wastes are ending up in dumping yards and recycling centers, posing a new challenge to the environment and policy makers as well. In general electronic gadgets are meant to make our lives happier and simpler, but the toxicity it contains, their disposal and recycling becomes a health nightmare. Most of the users are unaware of the potential negative impact of rapidly increasing use of computers, monitors, and televisions. This review article provides a concise overview of India's current e-waste scenario, namely magnitude of the problem, environmental and health hazards, current disposal, recycling operations and mechanisms to improve the condition for better environment. © 2014 Needhidasan et al.; licensee BioMed Central Ltd.

Fulltext

Journal of Environmental Health Science and Engineering

Electronic waste – an emerging threat to the environment of urban India

World Review of Science, Technology and Sustainable Development

Microbiological leaching of metals and its recovery from waste electrical and electronic equipment: a review

Journal of Material Cycles and Waste Management

Bioleaching of copper from metal concentrates of waste printed circuit boards by a newly isolated Acidithiobacillus ferrooxidans strain Z1

Enhanced bioleaching of copper from circuit boards of computer waste by Acidithiobacillus ferrooxidans

Journal	Data powered by TypesetEnvironmental Chemistry Letters
Publisher	Data powered by TypesetSpringer Science and Business Media LLC
ISSN	1610-3653
Open Access	0