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- 저자 : Baskar Rajoo (검색결과 4 건)
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Ramya Suresh,Baskar Rajoo,Maheswari Chenniappan,Manikandan Palanichamy 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.5
The present study focused on the various advanced oxidation processes; Ozone, UV radiation, O₃/H₂O₂, O₃/UV, UV/H₂O₂ and O₃/UV/H₂O₂ for treatability of dairy industry wastewater. With this aim, the trials were carried out in cylindrical reactor fortified with UV radiation and Ozone injection. Efficiency of the treatment process was evaluated considering Chemical Oxygen Demand (COD), lactose reduction and process parameters were determined to be reaction time, pH, circulation rate, and H₂O₂ dosage. 32.5%, 35.2% , 25%, 83% COD and 40.6%, 43.6%, 38.2%, 80% lactose reduction efficiency were obtained under the operating conditions for O₃/H₂O₂, O₃/UV, UV/H₂O₂ and O₃/UV/H₂O₂ processes, respectively. As per this outcome, UV/H₂O₂/O₃ process gave more than 65% of COD and 52.36% of lactose reduction efficiency than other hybrid processes. Optimum conditions for UV/H₂O₂/O₃ process (pH = 5, time = 180 mins, circulation rate = 50 mL/h and H₂O₂ dosage of 0.5 mL) resulted in 88% of COD and 93.4% lactose reduction.
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Sundramurthy Venkatesa Prabhu,Rajoo Baskar 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.2
The removal of heavy metals from industrial sludge through biosolubilization using sulfur-oxidizing bacteria has been shown to be a promising technology, but the process with surplus concentration of sulfur causes reacidification of the treated residues and creates environmental issues. Thus, the study for investigating the effect of sulfur concentration on the heavy metal biosolubilization system, with an emphasis on optimizing the sulfur concentration, is of immense importance. In this study, the experiments to investigate the effect of sulfur concentration on the performance of biosolubilization were carried out using 2–10 g/L elemental sulfur on heavy metal-laden electroplating sludge (50 g/L). The sludge-acclimatized, sulfur-grown Acidithiobacillus ferrooxidans isolate was used as sulfur-oxidizing bacteria. For the type of sludge used in this study, high pH reduction, short lag phase, and high heavy metal solubilization efficiencies were obtained in the treatment with 6 g/L sulfur. The kinetic study showed that the rate constant values of heavy metal solubilization were relatively high while using sulfur concentration of 6 g/L. The analysis using shrinking core model of fluid– particle reaction kinetics explicated that chemical reaction step controls the rate of heavy metal biosolubilization. The study provides an optimized strategy to design an efficient biosolubilization system for anticipated energy source.
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Venkatesa Prabhu, Sundramurthy,Baskar, Rajoo The Korean Society for Applied Biological Chemistr 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.2
The removal of heavy metals from industrial sludge through biosolubilization using sulfur-oxidizing bacteria has been shown to be a promising technology, but the process with surplus concentration of sulfur causes re-acidification of the treated residues and creates environmental issues. Thus, the study for investigating the effect of sulfur concentration on the heavy metal biosolubilization system, with an emphasis on optimizing the sulfur concentration, is of immense importance. In this study, the experiments to investigate the effect of sulfur concentration on the performance of biosolubilization were carried out using 2-10 g/L elemental sulfur on heavy metal-laden electroplating sludge (50 g/L). The sludge-acclimatized, sulfur-grown Acidithiobacillus ferrooxidans isolate was used as sulfur-oxidizing bacteria. For the type of sludge used in this study, high pH reduction, short lag phase, and high heavy metal solubilization efficiencies were obtained in the treatment with 6 g/L sulfur. The kinetic study showed that the rate constant values of heavy metal solubilization were relatively high while using sulfur concentration of 6 g/L. The analysis using shrinking core model of fluid-particle reaction kinetics explicated that chemical reaction step controls the rate of heavy metal biosolubilization. The study provides an optimized strategy to design an efficient biosolubilization system for anticipated energy source.
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Sundramurthy Venkatesa Prabhu,Rajoo Baskar,Srinivasan Natesan Rajendran,Kavitha Rajan 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.4
Biological methods for leaching of nonferrous and noble metals from its sulfide ores are widely applied at industrial enterprises of different countries. This process is based on the use of the oxidative activity of acidophilic microorganisms. Since all bio systems are quite sensitive to the temperature, bacterial leaching process also significantly effects. In the present study, the impact of temperature on bacterial leaching of Zn from its sulphide ore, sphalerite, was investigated using ore adapted iron oxidizing bacteria. The bacteria were isolated from mine drainage samples and subjected to gene sequencing. The acquired nucleotide sequence revealed that the isolate was Leptospirillum ferriphilum. The nucleotide sequence of L. ferriphilum isolate was submitted to National Center for Biotechnology Information (NCBI) and accession number KF743135 was assigned. Using the isolate, the Zn leaching data were collected in the 298–318 K temperature range. The results showed that leaching of Zn increases with temperature until optimum temperature of 313 K and achieves highest leaching efficiency of 96.96% within 20 days. Since bioleaching of minerals have become increasingly applied in different mining industries, there is immense important to analyze mechanistically- based kinetics for the design, optimization, operation, and control of biochemical processes. The kinetic study showed that the rate of Zn leaching was maximized at the optimum temperature. Further, the leaching data were analyzed using shrinking core model which revealed that the rate of leaching was inhibited by diffusion through product layer. Reaction kinetics is also to be contrasted with thermodynamics. Using Arrhenius law of thermodynamics, it was found that activation energy for Zn bioleaching reaction was 39.557 kJ mol−1. Such investigations will be necessitated for designing and implanting the ideal bioleaching system for metal bio-mining industries.
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