title: Influence of soil-water ratio on the performance of slurry phase bioreactor treating herbicide contaminated soil.
abstract: 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.
authors.affiliation: Biochemical and Environmental Engineering Center, Indian Institute of Chemical Technology, Hyderabad 500 007, India.
authors.forename: S
authors.initials: S
authors.lastname: Venkata Mohan
authors.forename: M
authors.initials: M
authors.lastname: Ramakrishna
authors.forename: S
authors.initials: S
authors.lastname: Shailaja
authors.forename: P N
authors.initials: PN
authors.lastname: Sarma
mesh_terms: D019149:Bioreactors; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006540:Herbicides / Q000737:chemistry*; D012987:Soil; D012989:Soil Pollutants; D014867:Water
chemical_list: D006540:Herbicides; D012987:Soil; D012989:Soil Pollutants; D014867:Water