Saravanan Pichiah

Publications (24) View all

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  Available from: Saravanan Pichiah

  Article: Studies on growth kinetics of predominantly Pseudomonas sp. in internal loop airlift bioreactor using phenol and m-cresol

  Pichiah Saravanan, Kannan Pakshirajan, Prabirkumar Saha
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  ABSTRACT: Growth profile of predominantly Pseudomonas species was studied using wastewater containing phenol and m-cresol, as single and multi component systems in an internal loop airlift bioreactor (ILALR). The species utilized for the study was isolated from a wastewater treatment plant. The reactor was operated at both lower and higher hydraulic retention time (HRTs), 4.1 h and 8.3 h, respectively. The inlet phenol and concentration was varied between 100 and 800 mg/L with 800 mg/L as shock loading concentration for an HRT of 8.3 h. For 4.1 h HRT, the concentration was varied 100 and 500 mg/L using 500 mg/L as a shock loading concentration. The study showed complete degradation of both phenol and m-cresol, when present individually at an HRT of 8.3 h with an enriched biomass output. The specific growth rate of the culture at various phenol and m-cresol concentrations was fitted to a Monod model. The biokinetics value showed good potential of Pseudomonas species employing the internal loop air lift bioreactor in utilizing high strength phenolics containing wastewater. Culture growth profile with both phenol and m-cresol as mixtures also showed decreased lag times with complete utilization of the phenolics. Key wordsBiomass–Internal Loop Airlift Bioreactor–Monod Model–Phenolics– Pseudomonas sp.–Wastewater
  Korean Journal of Chemical Engineering 04/2012; 28(7):1550-1555. · 0.99 Impact Factor
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  Available from: Saravanan Pichiah

  Article: Optimization of operating parameters using response surface methodology for adsorption of crystal violet by activated carbon prepared from mango kernel

  Prasad Sudamalla, Pichiah Saravanan, Manickam Matheswaran
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  ABSTRACT: An adsorbent prepared from mango seed was used to study its sorption potential on removing Crystal Violet dye from aqueous solution. The influences of operating parameters like pH, temperature, initial concentration and adsorbent dosage on dye adsorption were studied. A maximum dye removal of 95% was achieved with an initial concentration of 10 mg L-1. The percentage removal was mathematically described as a function of experimental parameters and was modeled through response surface methodology. The results show that the responses of color removal in adsorption of dyes were significantly affected by the synergistic effect of linear term of time and dosage and the quadratic term of temperature and time. A 24 full factorial design of experiments was adopted and statistical analysis was performed in the form of the analysis of variance and Student s t-test, which gave good interpretation in terms of interaction of experimental parameters. The interaction of the parameters temperature, pH, dye concentration and adsorbent dosage on Crystal Violet removal is also highly significant with confidential level > 99%.
  Sustainable Environmental Research. 01/2012; 22(1):1-7.
• Article: Visible light improved, photocatalytic activity of magnetically separable titania nanocomposite

  Azrina Abd Aziz, Chee Kaan Cheng, Shaliza Ibrahim, Manickam Matheswaran, Pichiah Saravanan
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  ABSTRACT: A visible light improved, magnetically separable TiO2 nanocomposite was successfully synthesized with silicon dioxide (SiO2) as coating and supported on a permanent magnet Viz., nickel ferrite (NiFe2O4). Thus synthesized photocatalysts was further characterized for its crystalline phase, particle size, surface morphology, inorganic composition, adsorption–desorption hysteresis, BET surface area, pore size distribution, magnetic hysteresis, saturation magnetization, coercivity, elemental composition, chemical state, electronic state and visible light absorption spectra analysis with respective techniques. The crystallographic peak and inorganic elemental composition revealed the structure and composition of pure and nanocomposite TiO2. The prepared titania nanocomposite resulted in lower band gap energy (2.26 eV) and higher visible light absorption between 400 and 800 nm than that of pure TiO2 (2.76 eV). The photocatalytic activity was investigated with a recalcitrant phenolic compound namely 2,4-dichlorophenol (2,4-DCP) as a model pollutant under direct bright and diffused sunlight irradiation. An almost complete degradation of 2,4-DCP was achieved with an initial concentration of 50 mg/L for TiO2 nanocomposite in 90 min and 5 h under bright and diffused sunlight conditions. Similarly pure TiO2 resulted in a nearly complete degradation in 180 min under bright and ≈90% in 5 h under diffused conditions. Further the TiO2 nanocomposite was recovered under a magnetic field with a mass recovery ≈95%. The nanocomposite also exhibited improved remanence, saturation magnetization and coercivity property along with good stability against magnetic property losses for reuse.
  Chemical Engineering Journal 01/2012; 183:349– 356. · 3.46 Impact Factor
• Article: Photocatalytic decolourization of basic green dye by pure and Fe, Co doped TiO2 under daylight illumination

  R. Lakshmi Narayana, Manickam Matheswaran, Azrina Abd Aziz, Pichiah Saravanan
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  ABSTRACT: In the present study, a pure TiO2 photocatalyst, Fe and Co doped photocatalystwas prepared via sol-gelmethod. The prepared photocatalysts were tested for its photocatalytic activity by decolorizing a basic dye namely malachite green dye under sunlight. The prepared photocatalystswere characterized with X-ray diffraction, scanning electron microscope and UV-Visible spectroscopy. From the decolourizing study, it was observed that Fe-doped TiO2 shown highest photocatalytic activity among the other two with 98% in 3 h. The Kinetics of dye decolourization was rationalized by amodified Langmuir–Hinshelwoodmodel. The overall rate constants (k’) for dye decolourization was observed in the order of 0.8 h-1 for Fe-doped 0.67 h-1 for Co-doped and 0.31 h-1 for pure TiO2.
  Desalination 01/2011; 269:249–253. · 2.59 Impact Factor
• Article: Visible Light Improved, Photocatalytic Activity of Magnetically Separable Titania Nanocomposite.

  A.A.Azrina, C.K. Cheng, S.Ibrahim, M.Matheswaran P.Saravanan
  Chemical Engineering Journal 01/2012; 10.1016/j.cej.2012.01.006.. · 3.46 Impact Factor