Influence of soil-water ratio on the performance of slurry phase bioreactor treating herbicide contaminated soil.
The influence of soil-water ratio was studied on the performance of the slurry phase bioreactor operated in sequencing batch mode (anoxic-aerobic-anoxic microenvironments) during the bioremediation of soil contaminated with pendimethalin. The performance of the reactors was evaluated at different soil-water ratios (1:5-1:25; at soil loading rate (60 kg of soil/cum-day to 12 kg of soil/cum-day)) keeping the loading rate of pendimethalin constant (133.2 g/kg of soil-day) in six reactors and variable (66.6 g/kg of soil-day to 166.6 g/kg of soil-day) in other four reactors. At 1:20 soil-water ratio, the slurry phase system showed enhanced degradation of substrate (629 microg pendimethalin/g soil). The removal efficiency of pendimethalin in the reactors was dependent on the mass-transfer rates of the substrate from the soil to the aqueous phase. Soil-water ratio and substrate loading rates showed significant influence on the substrate portioning, substrate degradation efficiency and substrate desorption rate.
Venkata Mohan
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Biochemical and Environmental Engineering Center, Indian Institute of Chemical Technology, Hyderabad 500 007, India.
Ramakrishna
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Shailaja
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Sarma
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PN
D019149:Bioreactors; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006540:Herbicides / Q000737:chemistry*; D012987:Soil; D012989:Soil Pollutants; D014867:Water
D006540:Herbicides; D012987:Soil; D012989:Soil Pollutants; D014867:Water