A.B Sathya - Academia.edu (original) (raw)

Papers by A.B Sathya

International Academic Journal of Nutrition and Food Sciences

The marine environment is a prolific resource for the isolation of less exploited microorganisms,... more The marine environment is a prolific resource for the isolation of less exploited microorganisms, and as a matter of fact in the sea, untapped habitats exist with unique characteristics. This is partly caused by the lack of effort spent in exploring marine actinomycetes, whereas terrestrial actinomycetes have been, until recently, a successful source of novel bioactive metabolites. Furthermore, scepticism regarding the existence of indigenous population of marine actinomycetes arises from the fact that the terrestrial bacteria produce resistant spores that are known to be transported from land into sea, where they remain available but dormant for many years. Thus, it has been frequently assumed that actinomycetes isolated from marine samples are merely of terrestrial origin. It may be better to seek evidence instead that marine derived actinomycetes are metabolically active or capable of growing in the marine environment. Other useful characteristics include the display of specific ...

Journal of Polymers and the Environment, 2018

Plastics play a very important role in our daily life. They are used for various purposes. But th... more Plastics play a very important role in our daily life. They are used for various purposes. But the disposal of these petrochemical-derived plastics causes a risk to the human and marine population, wildlife and environment. Also, due to the eventual depletion of petrochemical sources, there is a need for the development of alternate sources for the production of plastics. Biodegradable polymers produced by microorganisms can be used as substitutes for conventional plastics derived from petrochemical sources since they have similarity in their properties. Polyhydroxyalkanoate (PHA) is one such biopolymer that will be accumulated inside the cells of microorganisms as granules for energy storage under limiting conditions of nutrients and high concentration of carbon. Research on the microbial production of PHA should focus on the identification of costeffective substrates and also identification of a suitable strain of organism for production. The major focus of this review is the production of PHA from various cost-effective substrates using different bacterial species. The review also covers the biosynthetic pathway of PHA, extraction method, characterization technique, and applications of PHA in various sectors.

Environmental technology, Jan 28, 2017

In the present study, self-forming dynamic membrane (SFDM) on rigid high-density polyethylene (HD... more In the present study, self-forming dynamic membrane (SFDM) on rigid high-density polyethylene (HDPE) mesh with a large pore size of 2 mm is reported for the first time. The system was investigated for utilisation in simulated wastewater treatment by integrating the mesh with an aerobic bioreactor. The SFDM was analysed using Fourier transform infra-red (FT-IR) spectroscopy and visualised by scanning electron microscopy (SEM). The effect of the operating parameter on the change in composition of SFDM was also investigated. The system was used as a single unit for treatment of wastewater and showed stability over long-term treatment. The system could achieve a chemical oxygen demand (COD) reduction of 82.16 ± 6.47% at an influent COD concentration of 613.93 ± 72.13 mg/l and ammonia removal efficiency of 97.21 ± 0.62% at an influent ammonia concentration of 55.54 ± 2.23 mg/l. The reactor generated high-quality effluent and the turbidity recorded was less than 2NTU. In addition, the ope...

T he large amount of lignin and lignin-derived compounds are primarily responsible for effluent c... more T he large amount of lignin and lignin-derived compounds are primarily responsible for effluent color, due to the inherent high degree of conjugation in these molecules. There is thus the requirement on industries to minimize environmental release of color considered as toxicologically rather innocuous. Biological treatment is the often the most economical alternatives when compared with other physical and chemical processes. Biosorption potential of fungal species (Aspergillus niger) and Aquatic weed (Eichhornia crassipes) for synthetic dye such as Acid-Lanasyn yellow and Direct-Indosol royal blue studied with respect to temperature, time, pH, adsorbent dosage, agitation time and initial dye concentration to determine the kinetic model. The mechanism of dye sorption by Aspergillus niger and Eichhornia crassipes earned good fits for Freundlich and Langmuir models. Further desorption techniques were studies to recover the loaded pollutants. This study has shown the efficiency of A.ni...

Release of coloured textile effluent in to aquatic environment is detrimental as they prevent pen... more Release of coloured textile effluent in to aquatic environment is detrimental as they prevent penetration of light in to water, thereby affecting aquatic life and creates harmful water. Biosorption is an alternative treatment available other than physicochemical and biological methods to treat these toxic effluents. This study investigates the potential of water hyacinths to adsorb hazardous azo dye metanil yellow from aqueous solution. Metanil Yellow, is a widely used toxic dye containing one or more azo bonds (-N=N-). Metanil Yellow is used in number of industries such as textile, dyeing, food, cosmetics, paper printing industries and with textile industries as large consumers. Biosorption process was carried out using immobilized dead aquatic weeds. The influences of adsorption parameters such as initial dye concentration, pH, contact time, adsorbent dosage, agitation speed, and temperature were evaluated and optimized. Further the mechanism of biosorption earned good fits for La...

Ecotoxicology and Environmental Safety, 2015

A novel magnetic biocomposite was synthesized using metal chlorides and aquatic macrophytes by co... more A novel magnetic biocomposite was synthesized using metal chlorides and aquatic macrophytes by coprecipitation method. The resulting product, magnetic biocomposite was characterized by Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX) and Scanning electron microscope (SEM). The adsorption performance of the magnetic biocomposite was tested with removal of Metanil Yellow dye from aqueous solution. The effect of influencing parameters such as initial dye concentration, solution pH and agitation were investigated. The equilibrium isotherm was well described by the Langmuir model with the with maximum adsorption capacity of 90.91 mg/g. Adsorption kinetics experiments were carried out and the data were well fitted by a pseudo-secondorder equation. The results revealed that the magnetic biocomposite could efficiently adsorb the azo dyes from aqueous solution, and the spent adsorbents could be recovered completely by magnetic separation process. Therefore, the prepared magnetic biocomposite could thus be used as promising adsorbent for the removal of azo dyes from polluted water.

Environmental Nanotechnology, Monitoring & Management, 2014

Adsorption is the most extensively used technique for dye sequestration. Magnetic separation of t... more Adsorption is the most extensively used technique for dye sequestration. Magnetic separation of toxic pollutant is becoming a potential method in waste water purification and found to have predominant significance in the removal of dyes more effectively compared to conventional method of treatments. Numerous natural and synthetic adsorbents were used, out of which magnetic composites (MCs) and magnetic nanocomposites (MNCs) have gained much attention presently in the removal of dyes from aqueous solution. Abundant references are existing pertaining to synthesis of various magnetic composites and its application in adsorption of dyes. This report displays the exploitation of MCs and MNCs for adsorption of dyes, hazards posed by dyes, sorption mechanism, preparation methods, magnetic behavior and characteristics of magnetized particles with the relevant literature on the basic principle of adsorption using MCs and MNCs for separation of dyes under optimum physicochemical condition. Adsorption reaction model, diffusion model and isotherms which facilitate in understanding the reaction mechanism between adsorbent and adsorbate are concisely discussed.

Journal of Environmental Nanotechnology, 2014

ABSTRACT Azo compounds constitute the largest and the most diverse group of synthetic dyes and ar... more ABSTRACT Azo compounds constitute the largest and the most diverse group of synthetic dyes and are widely used in a number of industries such as textile, food, cosmetics and paper printing. They are generally recalcitrant to biodegradation due to their xenobiotic nature. However, aquatic macrophytes are highly versatile in reduction of azo dyes due to their porous nature. In this study, adsorption of an industrial azo dye Metanil Yellow on to acid treated and non-treated biosorbent is investigated. In addition, the study emphasize on identifying the factors exerting the strongest influence on adsorption of dye. The effect of the process parameters such as contact time, adsorbent dose, pH and agitation speed are reported. The contact time of 120 min is found to be sufficient for the adsorption to reach equilibrium. The pseudo first & second order models are used to describe the kinetic data, and the rate constant is therefore evaluated. The dye adsorption to biosorbent is characterized by monolayer isotherm and caused by adsorption with relatively strong uptake. The Langmuir and Freundlich models adsorption are applied to describe the isotherm equilibrium and to determine its constants. The Langmuir and Freundlich models agree well with the experimental data with an adsorption capacity of 91.743 & 85.179 mg of dye per gram of acid treated and non-treated biosorbent respectively. A better fixation was obtained at acidic pH.