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Karthikeyan, S.
- Photocatalytic Degradation of Aqueous Phenanthrene in a Slurry Photocatalytic Reactor:Optimization and Modelling
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PDF Views:68
Authors
Affiliations
1 Centre for Environmental Studies, Anna University, Chennai 600 025, IN
1 Centre for Environmental Studies, Anna University, Chennai 600 025, IN
Source
Current Science, Vol 115, No 9 (2018), Pagination: 1732-1740Abstract
A photoreactor with 254 nm, 16 W UV lamp was evaluated for phenanthrene (PHE) degradation. The effect of operating variables such as initial PHE concentration (1000–1500 μg/l), catalyst dosage (0.1– 0.9 g/l) and pH (3.0–9.0) on PHE degradation was investigated in detail. The batch study of photocatalytic process showed 83.5% PHE degradation and 60.2% TOC removal for optimized values (PHE concentration – 1000 μg/l, TiO2 dosage – 0.5 g/l and pH – 3.0) during 3 h reaction. The photocatalytic degradation of PHE was found to follow pseudo-first-order kinetics. The results obtained from continuous process revealed that nano TiO2 could be used for industrial applications because of its potential for long-term operations. Response surface methodology (RSM) with Design Expert software was used to analyse the obtained experimental data.Keywords
Degradation, Kinetic Constants, Mineralization, Photocatalysis, TiO2.Full Text
References
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- Bioavailability of Heavy Metals and Polycyclic Aromatic Hydrocarbon in Long-Term Sewage-Drained Soils of Tamil Nadu
Abstract Views :218 |
PDF Views:73
Authors
Veeramani Kathavarayan
1,
S. Avudainayagam
1,
K. Sara Parwin Banu
1,
N. Chandrasekharan
2,
S. Karthikeyan
3,
K. Bhuvaneswari
4,
P. T. Ramesh
1
Affiliations
1 Department of Environmental Science, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
2 Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
3 Department of Bioenergy, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
4 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
1 Department of Environmental Science, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
2 Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
3 Department of Bioenergy, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
4 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
Source
Current Science, Vol 117, No 3 (2019), Pagination: 448-459Abstract
Heavy metals and organic contaminants are reported in sewage discharged sites. Screening and assessment of their toxic concentration in soils of the discharged sites of major cities in Tamil Nadu, India have been carried out in the present study. The major cities included Coimbatore (Ukkadam; U), Madurai (Avanaiyapuram; A), Tiruchirappalli (Rettamalai; R), Nesapakkam (N) and Koyambedu (K) Chennai Corporation. The total aquaregia-extractable concentrations of cadmium, chromium, lead and nickel were measured and found to be highest in U, followed by A, R, N and K. Their potential bioavailabilities were quantified in the following order: Cd – N > U > K > R > A; Cr – N > A > K > R > U; Pb – N > K > R; U > A; Ni – N > K > R > U > A. Bioavailable Factor was found to be highest for Cd in U (2.9%–83%) followed by Cr in N (1.1%–62.3%) and Ni in (1.70%– 52.7%) N. With regard to organic contamination, the major pesticides belonged to 13 organochlorine, 10 organophosphate and 8 synthetic pyrethroids reported below detectable concentration. Among the 16 US EPA priority poly aromatic hydrocarbon (PAHs) only 15 were detected. However, PAHs were found to be less than the permissible concentration for soils (0.3 mg kg–1) in sewage-contaminated sites. The results show that there is potential risk of transfer of heavy metals to higher trophic level of the food chain.Keywords
Heavy Metals, Health Risk, Polycyclic Aromatic Hydrocarbon, Sewage Contamination.Full Text
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