Bioslurry Research Papers - Academia.edu (original) (raw)
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The need for high biodegradation rates requires application of microorganisms in controlled environmental and nutritional conditions. Soil slurry bioremediation is a powerful alternative to conventional methods in resolving environmental... more
The need for high biodegradation rates requires application of microorganisms in controlled environmental and nutritional conditions. Soil slurry bioremediation is a powerful alternative to conventional methods in resolving environmental oil contamination problems. This work studied the technical viability of treating soil slurry biologically by stimulation of native microorganisms. Oil contaminated mangrove soil
from Alakiri, Nigeria was mixed with water at 1:3 ratio and treated in three different ways (A, B and C). Statistical increase in microbial population and hydrocarbon removal efficiency were observed. In terms of total petroleum hydrocarbon degradation, removal efficiency of 55.31% was achieved in Slurry B (amended and stirred slurry),
closely followed by 53.21% of Slurry A (unamended and stirred slurry) and 31.58% for slurry C (amended and unstirred slurry). The importance of mechanical mixing on the microbial population dynamics and on the biodegradation of the oil was ascertained.
This study has shown that slurry bioreactor is effective in the bioremediation of soils containing oil-contaminants.
Fluid dynamic and mass transfer characteristics of a three-phase airlift reactor were studied in a rectangular split-vessel reactor. The gas–liquid–solid system consisted of air, seawater and marine sediment, respectively. Experiments... more
Fluid dynamic and mass transfer characteristics of a three-phase airlift reactor were studied in a rectangular split-vessel reactor. The gas–liquid–solid system consisted of air, seawater and marine sediment, respectively. Experiments were conducted over a range of downcomer to riser cross-sectional area ratios (AD/AR=1.0–0.65) and for five sediment concentrations (5–25% w/v). Simple models were used to simulate the fluid dynamic and mass transfer behavior for all experimental conditions examined. The fluid dynamic model was based on an energy balance which takes into account the energy dissipated at the phases interfaces. The mass transfer model was based on a two-phase fluid dynamic model, the Higbie's penetration theory and Kolmogoroff's theory of isotropic turbulence. Experimental data of gas holdup, liquid velocity and volumetric mass transfer coefficient were simulated with satisfactory accuracy (differences less than 20% for most cases) when assumptions regarding to gas recirculation on the overall gas holdup and the volumetric mass transfer coefficient were made.