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Title: Hexavalent chromium removal in two-stage bioreactor system

Abstract

A two-stage bioreactor system was used to reduce Cr(VI). Escherichia coli ATCC 33456 cells were aerobically grown in a first-stage chemostat, and then pumped to a second-stage plug-flow reactor where anaerobic Cr(VI) reduction occurred. Experimental results demonstrated that near complete removal of Cr(VI) was achieved in the plug-flow reactor under appropriate operating conditions. The removal efficiency in the plug-flow reactor was significantly affected by the influent Cr(VI) concentration, Cr(VI) loading rate, liquid detention time, and a consumed Cr(VI) reduction capacity factor. The consumed Cr(VI) reduction capacity factor was directly related to the toxicity effect of Cr(VI) on cells. To illustrate the influence of the consumed reduction capacity factor on Cr(VI) reduction in the plug-flow reactor, a mathematical model was developed by incorporating Cr(VI) reduction kinetics into the mass balance relationship of C(VI) for a plug-flow reactor. Analyses of Cr(VI) concentration profiles along the plug-flow reactor using both model simulations and experimental data indicated that the rate of Cr(VI) reduction decreased with the depletion of the reduction capacity of cells ad Cr(VI) reduction ceased after the reduction capacity was exhausted.

Authors:
;  [1]
  1. Univ. of Kentucky, Lexington, KY (United States). Dept. of Civil Engineering
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
162996
Resource Type:
Journal Article
Journal Name:
Journal of Environmental Engineering
Additional Journal Information:
Journal Volume: 121; Journal Issue: 11; Other Information: PBD: Nov 1995
Country of Publication:
United States
Language:
English
Subject:
56 BIOLOGY AND MEDICINE, APPLIED STUDIES; BIOREACTORS; PERFORMANCE; CHROMIUM; BIODEGRADATION; TOXICITY; ESCHERICHIA COLI; GROWTH; MATHEMATICAL MODELS; AEROBIC CONDITIONS

Citation Formats

Shen, H, and Wang, Y T. Hexavalent chromium removal in two-stage bioreactor system. United States: N. p., 1995. Web. doi:10.1061/(ASCE)0733-9372(1995)121:11(798).
Shen, H, & Wang, Y T. Hexavalent chromium removal in two-stage bioreactor system. United States. https://doi.org/10.1061/(ASCE)0733-9372(1995)121:11(798)
Shen, H, and Wang, Y T. 1995. "Hexavalent chromium removal in two-stage bioreactor system". United States. https://doi.org/10.1061/(ASCE)0733-9372(1995)121:11(798).
@article{osti_162996,
title = {Hexavalent chromium removal in two-stage bioreactor system},
author = {Shen, H and Wang, Y T},
abstractNote = {A two-stage bioreactor system was used to reduce Cr(VI). Escherichia coli ATCC 33456 cells were aerobically grown in a first-stage chemostat, and then pumped to a second-stage plug-flow reactor where anaerobic Cr(VI) reduction occurred. Experimental results demonstrated that near complete removal of Cr(VI) was achieved in the plug-flow reactor under appropriate operating conditions. The removal efficiency in the plug-flow reactor was significantly affected by the influent Cr(VI) concentration, Cr(VI) loading rate, liquid detention time, and a consumed Cr(VI) reduction capacity factor. The consumed Cr(VI) reduction capacity factor was directly related to the toxicity effect of Cr(VI) on cells. To illustrate the influence of the consumed reduction capacity factor on Cr(VI) reduction in the plug-flow reactor, a mathematical model was developed by incorporating Cr(VI) reduction kinetics into the mass balance relationship of C(VI) for a plug-flow reactor. Analyses of Cr(VI) concentration profiles along the plug-flow reactor using both model simulations and experimental data indicated that the rate of Cr(VI) reduction decreased with the depletion of the reduction capacity of cells ad Cr(VI) reduction ceased after the reduction capacity was exhausted.},
doi = {10.1061/(ASCE)0733-9372(1995)121:11(798)},
url = {https://www.osti.gov/biblio/162996}, journal = {Journal of Environmental Engineering},
number = 11,
volume = 121,
place = {United States},
year = {Wed Nov 01 00:00:00 EST 1995},
month = {Wed Nov 01 00:00:00 EST 1995}
}