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Title: Pentachlorophenol mineralization in an immobilized soil bioreactor

Abstract

The biological degradation of pentachlorophenol (PCP) was conducted in a new type of reactor-the immobilized soil bioreactor. In this bioreactor soil particles having natural microbial activity in degrading the target pollutant are entrapped into a solid membrane with a large pore size distribution. The resulting {open_quotes}immobilized soil{close_quotes} system can be easily supplied with dissolved mineral salts, oxygen and target pollutant and as a result an active microbial consortium will be quickly established. This consortium is later used for treatment of aqueous solutions of the pollutant, for instance, contaminated ground water. We have studied the process of PCP biodegradation in both batch and continuous regime. our results showed that the volumetric effectiveness of the process of PCP mineralization in the immobilized soil bioreactor is between 7 and 4000 times higher than results reported in the literature. It has been found that both chlorine and carbon atoms of PCP are at least 99% mineralized. 7 refs., 4 figs., 1 tab.

Authors:
; ;  [1]
  1. Ecole Polytechnique, Montreal (Canada)
Publication Date:
OSTI Identifier:
430586
Report Number(s):
CONF-960730-
TRN: 96:006487-0097
Resource Type:
Conference
Resource Relation:
Conference: 5. world congress of chemical engineering, San Diego, CA (United States), 14-18 Jul 1996; Other Information: PBD: 1996; Related Information: Is Part Of The 5th World Congress of chemical engineering: Technologies critical to a changing world. Volume III: Emerging energy technologies clean technologies remediation and emission control fuels and petrochemicals; PB: 1118 p.
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; PHENOLS; BIODEGRADATION; MINERALIZATION; BIOREACTORS; PERFORMANCE TESTING; CHLORINE COMPOUNDS; SOILS

Citation Formats

Karamanev, D., Chavarie, C., and Samson, R. Pentachlorophenol mineralization in an immobilized soil bioreactor. United States: N. p., 1996. Web.
Karamanev, D., Chavarie, C., & Samson, R. Pentachlorophenol mineralization in an immobilized soil bioreactor. United States.
Karamanev, D., Chavarie, C., and Samson, R. 1996. "Pentachlorophenol mineralization in an immobilized soil bioreactor". United States. doi:.
@article{osti_430586,
title = {Pentachlorophenol mineralization in an immobilized soil bioreactor},
author = {Karamanev, D. and Chavarie, C. and Samson, R.},
abstractNote = {The biological degradation of pentachlorophenol (PCP) was conducted in a new type of reactor-the immobilized soil bioreactor. In this bioreactor soil particles having natural microbial activity in degrading the target pollutant are entrapped into a solid membrane with a large pore size distribution. The resulting {open_quotes}immobilized soil{close_quotes} system can be easily supplied with dissolved mineral salts, oxygen and target pollutant and as a result an active microbial consortium will be quickly established. This consortium is later used for treatment of aqueous solutions of the pollutant, for instance, contaminated ground water. We have studied the process of PCP biodegradation in both batch and continuous regime. our results showed that the volumetric effectiveness of the process of PCP mineralization in the immobilized soil bioreactor is between 7 and 4000 times higher than results reported in the literature. It has been found that both chlorine and carbon atoms of PCP are at least 99% mineralized. 7 refs., 4 figs., 1 tab.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1996,
month =
}

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  • The process of entrapment, or immobilization, of soil particles into the pores of a geotextile membrane was studied. The immobilized soil bioreactor was used for carrying out the process of immobilization. A mathematical model of the liquid flow structure in the reactor is presented. It has been shown that soil particles with a size between 0 and 400 {mu}m can be immobilized in the geotextile membrane. The fastest immobilization was observed for particle sizes around 200 {mu}m. The profile of the surface density of immobilized soil by the reactor height was also studied. This profile can be linked to themore » liquid flow structure predicted from the model. The maximum surface density of immobilized soil was 2 kg /m{sup 2}. 4 refs., 5 figs.« less
  • The hydrodynamic characteristics of a new type of reactor, the immobilized soil bioreactor, were studied. This apparatus is a practical new engineering concept (soil immobilization) based on entrapment of soil particles, which contain pollutant-degrading microorganisms, in the pores of a geotextile to activate the indigenous microorganisms. The soil immobilization is the third on the size scale of immobilization processes, coming after (1) that of molecules in heterogeneous catalysis (in Angstrom) and (2) that of microbial cells and their fragments in immobilized cells and enzymes biocatalysis (in micron). The size of immobilized soil particles is in the range of a millimeter.more » A mathematical model of liquid flow within the reactor is proposed, which qualitatively explains the distribution of the immobilized soil in space. The dynamics of soil immobilization within the bioreactor has been studied as a function of the particle size, initial slurry concentration and air flow rate. A mathematical model of the process of soil immobilization was proposed based on deep filter mechanics. The process can be described by a second-order kinetic model. This study will be of great importance for the design of immobilized soil bioreactors for degradation of recalcitrant soil pollutants.« less
  • Short communication.
  • A novel 2-L fluidized bioreactor was designed and built and its performance characteristics were compared with those of an ordinary stirred-tank bioreactor. Calcium alginate beads containing immobilized cells of Zymomonas mobilis were used in both types of bioreactors to produce ethanol from glucose. The Ca-alginate beads were exposed to low shear rates inside the fluidized bioreactor and as a result the cell leakage from the beads was found to be about 100 times less than the cell leakage obtained in the mechanically stirred bioreactor. For the operating conditions studied, the fluidized bioreactor system gave at least 64% higher maximum ratemore » of ethanol production and the power consumption per unit volume was found to be about four times less than that obtained with the mechanically stirred bioreactor. 9 figures, 1 table.« less
  • A mathematical model of a three-phase, tapered, fluidized-bed bioreactor has been developed. This model includes the effects of the tapered bed, a variable dispersion coefficient, and the concentration profile inside the biocatalyst bead on the reaction rate within the bed. Parameters in this model were obtained by adjusting them, within a realistic range, such that the square of the difference between the values predicted by the model and those obtained experimentally was minimized. The model was found to predict experimentally obtained concentration profiles quite accurately. It also demonstrates the need to include the effects of variable dispersion in three-phase systemsmore » where the gas phase is being generated inside the reactor, as the dispersion coefficient varied by more than an order of magnitude across the bed.« less