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Nandita Singh - One of the best experts on this subject based on the ideXlab platform.
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influence of the application of sugarcane bagasse on lindane γ hch mobility through Soil Column implication for biotreatment
Bioresource Technology, 2008Co-Authors: Purushothaman Chirakkuzhyil Abhilash, Nandita SinghAbstract:Abstract In the present study we employed sugarcane bagasse for biotreatment of Soil containing 50 mg kg −1 of lindane. Garden Soil were treated with lindane and amended with varying concentrations of sugarcane bagasse (10%, 20%, 30%, 40% and 50%; w/w). Data on dissipation and degradation of lindane in Soil Columns (0–15, 15–30 cm) were studied at six consecutive samplings (0, 3, 7, 45 and 60 days). Treatment with 50% sugarcane bagasse resulted in >53% degradation of lindane in upper Soil Column with minimal leaching to lower Soil Column (0.002%) while highest leaching of lindane from upper Soil Column to lower Soil Column was occurred in garden Soil (35.8%). Similarly, a substantial microbial biomass input has detected in amended Soil than garden Soil. Our results provide evidence that sugarcane bagasse can accelerate lindane degradation by enhanced microbial activity and prevent pesticide mobility through Soil Column by adsorption. Sugarcane bagasse could be useful as cheaper, easy available alternative for the biotreatment of lindane impacted Soil.
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influence of the application of sugarcane bagasse on lindane gamma hch mobility through Soil Column implication for biotreatment
Bioresource Technology, 2008Co-Authors: Purushothaman Chirakkuzhyil Abhilash, Nandita SinghAbstract:In the present study we employed sugarcane bagasse for biotreatment of Soil containing 50 mgkg(-1) of lindane. Garden Soil were treated with lindane and amended with varying concentrations of sugarcane bagasse (10%, 20%, 30%, 40% and 50%; w/w). Data on dissipation and degradation of lindane in Soil Columns (0-15, 15-30cm) were studied at six consecutive samplings (0, 3, 7, 45 and 60 days). Treatment with 50% sugarcane bagasse resulted in >53% degradation of lindane in upper Soil Column with minimal leaching to lower Soil Column (0.002%) while highest leaching of lindane from upper Soil Column to lower Soil Column was occurred in garden Soil (35.8%). Similarly, a substantial microbial biomass input has detected in amended Soil than garden Soil. Our results provide evidence that sugarcane bagasse can accelerate lindane degradation by enhanced microbial activity and prevent pesticide mobility through Soil Column by adsorption. Sugarcane bagasse could be useful as cheaper, easy available alternative for the biotreatment of lindane impacted Soil.
Purushothaman Chirakkuzhyil Abhilash - One of the best experts on this subject based on the ideXlab platform.
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influence of the application of sugarcane bagasse on lindane γ hch mobility through Soil Column implication for biotreatment
Bioresource Technology, 2008Co-Authors: Purushothaman Chirakkuzhyil Abhilash, Nandita SinghAbstract:Abstract In the present study we employed sugarcane bagasse for biotreatment of Soil containing 50 mg kg −1 of lindane. Garden Soil were treated with lindane and amended with varying concentrations of sugarcane bagasse (10%, 20%, 30%, 40% and 50%; w/w). Data on dissipation and degradation of lindane in Soil Columns (0–15, 15–30 cm) were studied at six consecutive samplings (0, 3, 7, 45 and 60 days). Treatment with 50% sugarcane bagasse resulted in >53% degradation of lindane in upper Soil Column with minimal leaching to lower Soil Column (0.002%) while highest leaching of lindane from upper Soil Column to lower Soil Column was occurred in garden Soil (35.8%). Similarly, a substantial microbial biomass input has detected in amended Soil than garden Soil. Our results provide evidence that sugarcane bagasse can accelerate lindane degradation by enhanced microbial activity and prevent pesticide mobility through Soil Column by adsorption. Sugarcane bagasse could be useful as cheaper, easy available alternative for the biotreatment of lindane impacted Soil.
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influence of the application of sugarcane bagasse on lindane gamma hch mobility through Soil Column implication for biotreatment
Bioresource Technology, 2008Co-Authors: Purushothaman Chirakkuzhyil Abhilash, Nandita SinghAbstract:In the present study we employed sugarcane bagasse for biotreatment of Soil containing 50 mgkg(-1) of lindane. Garden Soil were treated with lindane and amended with varying concentrations of sugarcane bagasse (10%, 20%, 30%, 40% and 50%; w/w). Data on dissipation and degradation of lindane in Soil Columns (0-15, 15-30cm) were studied at six consecutive samplings (0, 3, 7, 45 and 60 days). Treatment with 50% sugarcane bagasse resulted in >53% degradation of lindane in upper Soil Column with minimal leaching to lower Soil Column (0.002%) while highest leaching of lindane from upper Soil Column to lower Soil Column was occurred in garden Soil (35.8%). Similarly, a substantial microbial biomass input has detected in amended Soil than garden Soil. Our results provide evidence that sugarcane bagasse can accelerate lindane degradation by enhanced microbial activity and prevent pesticide mobility through Soil Column by adsorption. Sugarcane bagasse could be useful as cheaper, easy available alternative for the biotreatment of lindane impacted Soil.
Jirka Simůnek - One of the best experts on this subject based on the ideXlab platform.
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Multi-process herbicide transport in structured Soil Columns: experiments and model analysis.
Journal of Contaminant Hydrology, 2006Co-Authors: J. Maximilian Köhne, Sigrid Köhne, Jirka SimůnekAbstract:Model predictions of pesticide transport in structured Soils are complicated by multiple processes acting concurrently. In this study, the hydraulic, physical, and chemical nonequilibrium (HNE, PNE, and CNE, respectively) processes governing herbicide transport under variably saturated flow conditions were studied. Bromide (Br � ), isoproturon (IPU, 3-(4-isoprpylphenyl)-1,1-dimethylurea) and terbuthylazine (TER, N 2 -tert-butyl-6-chloro-N 4 -ethyl-1,3,5-triazine-2,4-diamine) were applied to two Soil Columns. An aggregated Ap Soil Column and a macroporous, aggregated Ah Soil Column were irrigated at a rate of 1c m h � 1 for 3 h. Two more irrigations at the same rate and duration followed in weekly intervals. Nonlinear (Freundlich) equilibrium and two-site kinetic sorption parameters were determined for IPU and
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inverse dual permeability modeling of preferential water flow in a Soil Column and implications for field scale solute transport
Vadose Zone Journal, 2006Co-Authors: Maximilian J Kohne, Binayak P Mohanty, Jirka SimůnekAbstract:The question of whether or not Soil hydraulic parameters of dual-permeability models (DPM) can be properly identified by inverse analysis of preferential water flow data has not been resolved to date. We applied a DPM based on two coupled Richards9 equations to compare the performance of inverse and forward simulations of laboratory preferential flow data. Infiltration and drainage experiments were conducted using a repacked loam Soil Column (80 cm long, 24-cm diameter) containing a cylindrical sand region (2.4-cm diameter) as the preferential flow path (PFP) along its central axis. The forward DPM water flow simulations relied on hydraulic parameters for the matrix and the PFP as determined by means of separate infiltration and drainage experiments on loam and sand Columns, respectively. One inverse DPM approach relied on standard (lumped) observations of infiltration and outflow, while the other included outflow through the matrix and the PFP. Both inverse approaches provided accurate matches of bulk infiltration and outflow, but the outflow out of the matrix and the PFP could only be described when fitting the DPM to region-specific outflow data. The practical implication of this finding for predicting solute transport in natural Soils was evaluated. An observed tile-drainage hydrograph was used for inverse hydraulic DPM parameter estimation, followed by fitting the solute transfer coefficient and the dispersivity for simulating Br − tracer concentrations. This sequential fitting procedure was successful for hydrograph simulation but unsuccessful for Br − breakthrough simulation. Simultaneous hydraulic and transport parameter estimation considerably improved the approximation of Br − concentrations. This study shows that a hydrograph alone is not sufficient for inverse identification of Soil hydraulic DPM parameters. Simultaneously employing hydrograph and solute breakthrough data may facilitate identification of hydraulic and transport DPM parameters to characterize preferential flow and solute transport.
P Van Cappellen - One of the best experts on this subject based on the ideXlab platform.
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water table fluctuations and Soil biogeochemistry an experimental approach using an automated Soil Column system
Journal of Hydrology, 2014Co-Authors: Fereidoun Rezanezhad, Raoulmarie Couture, R Kovac, David W Oconnell, P Van CappellenAbstract:Summary Water table fluctuations significantly affect the biological and geochemical functioning of Soils. Here, we introduce an automated Soil Column system in which the water table regime is imposed using a computer-controlled, multi-channel pump connected to a hydrostatic equilibrium reservoir and a water storage reservoir. The potential of this new system is illustrated by comparing results from two Columns filled with 45 cm of the same homogenized riparian Soil. In one Soil Column the water table remained constant at −20 cm below the Soil surface, while in the other the water table oscillated between the Soil surface and the bottom of the Column, at a rate of 4.8 cm d −1 . The experiment ran for 75 days at room temperature (25 ± 2 °C). Micro-sensors installed at −10 and −30 cm below the Soil surface in the stable water table Column recorded constant redox potentials on the order of 600 and −200 mV, respectively. In the fluctuating water table Column, redox potentials at the same depths oscillated between oxidizing (∼700 mV) and reducing (∼−100 mV) conditions. Pore waters collected periodically and solid-phase analyses on core material obtained at the end of the experiment highlighted striking geochemical differences between the two Columns, especially in the time series and depth distributions of Fe, Mn, K, P and S. Soil CO 2 emissions derived from headspace gas analysis exhibited periodic variations in the fluctuating water table Column, with peak values during water table drawdown. Transient redox conditions caused by the water table fluctuations enhanced microbial oxidation of Soil organic matter, resulting in a pronounced depletion of particulate organic carbon in the midsection of the fluctuating water table Column. Denaturing Gradient Gel Electrophoresis (DGGE) revealed the onset of differentiation of the bacterial communities in the upper (oxidizing) and lower (reducing) Soil sections, although no systematic differences in microbial community structure between the stable and fluctuating water table Columns were detected.
Yanfang Feng - One of the best experts on this subject based on the ideXlab platform.
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biochar combined with polyvalent phage therapy to mitigate antibiotic resistance pathogenic bacteria vertical transfer risk in an undisturbed Soil Column system
Journal of Hazardous Materials, 2019Co-Authors: Mao Ye, Zhongyun Zhang, Shengtian Zhang, Yuanchao Zhao, Shaopo Deng, Lingya Kong, Rongorng Ying, Wentao Jiao, Jiaqi Cheng, Yanfang FengAbstract:Abstract The vertical migration of antibiotic resistance pathogenic bacteria (ARPB) and antibiotic resistance genes (ARGs) in the surface Soil-vadose Soil system has become a new threat to ecological safety and public health; there is an imperative need to develop an efficient technique for targeted control and inactivation of ARPB in these systems. In this work, undisturbed Soil Columns (0 ∼ −5 m) were constructed to investigate the impact of biochar amendment or/and polyvalent bacteriophage (ΦYSZ-KK) therapy on the vertical control and inactivation of tetracycline-resistant Escherichia coli K-12 and chloramphenicol-resistant Klebsiella pneumonia K-6. The simultaneous application of polyvalent phage and biochar impeded the vertical migration of ARPB from the top Soil to lower Soil layers and stimulated the ARPB dissipation in the Soil Column. After 60-day incubation, levels of ARPB and ARGs decreased significantly in the Soil Column by magnitudes of 2-6. Additionally, high throughput sequencing indicated that the simultaneous application of biochar and phage clearly maintained the structure and diversity of the Soil microbial communities (p