TY - JOUR
T1 - Nitrate removal from saline water using autotrophic denitrification by the bacterium Thiobacillus denitrificans MP-1
AU - Zhao, Z.
AU - Qiu, W.
AU - Koenig, A.
AU - Fan, X.
AU - Gu, J. D.
N1 - Funding Information:
This research was partially supported by ITS/276/00 from the Innovative Technology Commission of Hong Kong SAR Government and also the industrial partnerships with Kou Hing Hong Scientific Supplies, Peako Engineering Co. and The Macao Water Supply Co. We would like to thank the technical laboratory support of Jessie Lai and comments of reviewers on improvement of an early version of this manuscript.
PY - 2004
Y1 - 2004
N2 - Autotrophic denitrification of synthetic wastewater by Thiobacillus denitrificans MP-1 isolated from mangrove sediment was investigated in both up-flow packed-bed reactors and fermentor. More than 97.5% and 90% of the nitrate in inflow was removed after 8.8 and 161 hours at 250 and 195 mg 1-1 for the packed-bed reactor and fermentor system, respectively. The nitrate was quickly denitrified at very low flow rates (0.11 m h-1) for the packed-bed reactors, but as the flow rate was greater than 0.13 m 1-1, the nitrate removal rate increased as the flow rate increased. In the static fermentor system, the denitrification can be described by a secondary reaction, but at a flow rate between 1.31 to 1.49 m h-1, the reactor performance can be described using the zero-order reaction in the packed-bed reactor. As the speed increases, the zero-order reaction translates into half-order reaction as the penetration efficiency of nitrate decreases. The mass ratios between the nitrate removed and the sulfate produced were determined to be 6.81 and 9.32 in the reactor column and fermentor, respectively. The results of this study suggest that efficient removal of high concentrations of nitrate in water or wastewater can be achieved effectively using autotrophic bacteria immobilized on surfaces of sulphur granules in packed-bed reactor.
AB - Autotrophic denitrification of synthetic wastewater by Thiobacillus denitrificans MP-1 isolated from mangrove sediment was investigated in both up-flow packed-bed reactors and fermentor. More than 97.5% and 90% of the nitrate in inflow was removed after 8.8 and 161 hours at 250 and 195 mg 1-1 for the packed-bed reactor and fermentor system, respectively. The nitrate was quickly denitrified at very low flow rates (0.11 m h-1) for the packed-bed reactors, but as the flow rate was greater than 0.13 m 1-1, the nitrate removal rate increased as the flow rate increased. In the static fermentor system, the denitrification can be described by a secondary reaction, but at a flow rate between 1.31 to 1.49 m h-1, the reactor performance can be described using the zero-order reaction in the packed-bed reactor. As the speed increases, the zero-order reaction translates into half-order reaction as the penetration efficiency of nitrate decreases. The mass ratios between the nitrate removed and the sulfate produced were determined to be 6.81 and 9.32 in the reactor column and fermentor, respectively. The results of this study suggest that efficient removal of high concentrations of nitrate in water or wastewater can be achieved effectively using autotrophic bacteria immobilized on surfaces of sulphur granules in packed-bed reactor.
KW - Autotrophic denitrification
KW - Kinetics
KW - Nitrate removal
KW - Thiobacillus denitrificans MP-1
UR - http://www.scopus.com/inward/record.url?scp=9444257489&partnerID=8YFLogxK
U2 - 10.1080/09593332508618387
DO - 10.1080/09593332508618387
M3 - 文章
C2 - 15551834
AN - SCOPUS:9444257489
SN - 0959-3330
VL - 25
SP - 1201
EP - 1210
JO - Environmental Technology (United Kingdom)
JF - Environmental Technology (United Kingdom)
IS - 10
ER -