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- W2289837241 abstract "Nonaqueous-phase liquid (NAPL) contaminants are difficult to eliminate from natural aquifers due, in part, to the heterogeneous structure of the soil. Chemotaxis enhances the mixing of bacteria with contaminant sources in low-permeability regions, which may not be readily accessible by advection and dispersion alone. A microfluidic device was designed to mimic heterogeneous features of a contaminated groundwater aquifer. NAPL droplets (toluene) were trapped within a fine pore network, and bacteria were injected through a highly conductive adjacent macrochannel. Chemotactic bacteria (Pseudomonas putida F1) exhibited greater accumulation near the pore network at 0.5 m/day than both the nonchemotactic control and the chemotactic bacteria at a higher groundwater velocity of 5 m/day. Chemotactic bacteria accumulated in the vicinity of NAPL droplets, and the accumulation was 15% greater than a nonchemotactic mutant. Indirect evidence showed that chemotactic bacteria were retained within the contaminated low-permeability region longer than nonchemotactic bacteria at 0.25 m/day. This retention was diminished at 5 m/day. Numerical solutions of the bacterial-transport equations were consistent with the experimental results. Because toluene is degraded by P. putida F1, the accumulation of chemotactic bacteria around NAPL sources is expected to increase contaminant consumption and improve the efficiency of bioremediation." @default.
- W2289837241 created "2016-06-24" @default.
- W2289837241 creator A5001475847 @default.
- W2289837241 creator A5049501343 @default.
- W2289837241 creator A5088962884 @default.
- W2289837241 date "2015-12-17" @default.
- W2289837241 modified "2023-10-18" @default.
- W2289837241 title "Enhanced Retention of Chemotactic Bacteria in a Pore Network with Residual NAPL Contamination" @default.
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- W2289837241 doi "https://doi.org/10.1021/acs.est.5b03872" @default.
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- W2289837241 hasPublicationYear "2015" @default.
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