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Treatment of hexavalent chrome by bacteria. Saikin ni yoru rokka kuromu no shori

Journal Article:

Abstract

A biological reduction method in which hazardous hexavalent chrome is reduced by bacteria is explained as one of the bioremediation technologies. Those bacteria are separated from active sludge in the urban sewage treatment plant. The hexavalent chrome-reducing bacteria were isolated by cultivating the sludge. They were Enterobacter cloacae which are intestinal bacteria. Then, they were named HO1 stock. As a result of analyzing the reduction mechanism, it was made clear that the function is localized in the cellular endosporium and that the reduction is made by utilizing the electronic transfer system of endosporium. Under both aerobic and anaerobic conditions, they convert the hexavalent chrome into the trivalent chrome outside the cells. As a result of test, it was known that 5mM hexavalent chrome can be treated in one day. A quick reduction was confirmed also through an experiment in which carbon source was added to the industrial wastewater. If used for the treatment of sludge/water contaminated by hexavalent chrome, the present reduction by bacteria has the following advantages: The highest reduction rate is given near pH=7 at ordinary temperatures. It is not necessary to add chemicals. Energy is not needed. It is a disadvantageous fact that the present bacteria, if  More>>
Authors:
Otake, H [1] 
  1. Hiroshima University, Hiroshima (Japan). Faculty of Engineering
Publication Date:
Aug 01, 1993
Product Type:
Journal Article
Reference Number:
NEDO-93-950503; EDB-94-008561
Resource Relation:
Journal Name: Bio Industry; (Japan); Journal Volume: 10:8
Subject:
59 BASIC BIOLOGICAL SCIENCES; 54 ENVIRONMENTAL SCIENCES; BIODEGRADATION; MICROORGANISMS; BIOTECHNOLOGY; MEDIATION; CHROMIUM COMPOUNDS; HAZARDOUS MATERIALS; REDUCTION; ADDITIVES; AEROBIC CONDITIONS; ANAEROBIC CONDITIONS; CARBON SOURCES; CHEMICAL EFFLUENTS; DEACTIVATION; ENERGY CONSERVATION; ESCHERICHIA COLI; PH VALUE; BACTERIA; CHEMICAL REACTIONS; CHEMICAL WASTES; DECOMPOSITION; MATERIALS; NONRADIOACTIVE WASTES; TRANSITION ELEMENT COMPOUNDS; WASTES; 550200* - Biochemistry; 550700 - Microbiology; 540220 - Environment, Terrestrial- Chemicals Monitoring & Transport- (1990-)
OSTI ID:
5814922
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Journal ID: ISSN 0910-6545; CODEN: BIINEG
Submitting Site:
NEDO
Size:
Pages: 26-32
Announcement Date:

Journal Article:

Citation Formats

Otake, H. Treatment of hexavalent chrome by bacteria. Saikin ni yoru rokka kuromu no shori. Japan: N. p., 1993. Web.
Otake, H. Treatment of hexavalent chrome by bacteria. Saikin ni yoru rokka kuromu no shori. Japan.
Otake, H. 1993. "Treatment of hexavalent chrome by bacteria. Saikin ni yoru rokka kuromu no shori." Japan.
@misc{etde_5814922,
title = {Treatment of hexavalent chrome by bacteria. Saikin ni yoru rokka kuromu no shori}
author = {Otake, H}
abstractNote = {A biological reduction method in which hazardous hexavalent chrome is reduced by bacteria is explained as one of the bioremediation technologies. Those bacteria are separated from active sludge in the urban sewage treatment plant. The hexavalent chrome-reducing bacteria were isolated by cultivating the sludge. They were Enterobacter cloacae which are intestinal bacteria. Then, they were named HO1 stock. As a result of analyzing the reduction mechanism, it was made clear that the function is localized in the cellular endosporium and that the reduction is made by utilizing the electronic transfer system of endosporium. Under both aerobic and anaerobic conditions, they convert the hexavalent chrome into the trivalent chrome outside the cells. As a result of test, it was known that 5mM hexavalent chrome can be treated in one day. A quick reduction was confirmed also through an experiment in which carbon source was added to the industrial wastewater. If used for the treatment of sludge/water contaminated by hexavalent chrome, the present reduction by bacteria has the following advantages: The highest reduction rate is given near pH=7 at ordinary temperatures. It is not necessary to add chemicals. Energy is not needed. It is a disadvantageous fact that the present bacteria, if exposed to oxygen, become inactive. 18 refs., 5 figs.}
journal = {Bio Industry; (Japan)}
volume = {10:8}
journal type = {AC}
place = {Japan}
year = {1993}
month = {Aug}
}