2007 Fiscal Year Final Research Report Summary
Microbial removal of heavy metals from agricultural and marine industrial wastes in a sequential and mixed cultivation
| Project/Area Number |
17580285
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Boundary agriculture
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| Research Institution | Muroran Institute of Technology |
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Principal Investigator |
KIKUCHI Shintaro Muroran Institute of Technology, Department of Applied Chemistry, Professor (70148691)
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| Project Period (FY) |
2005 – 2007
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| Keywords | africultura and marine industrial wastes / microbial removal of heavy metals / sequential and mixed cultivation / heavi metal-binding proteins / proteolytic microbes / sulfate-reducing bacteria / metal-sulfide precipitates |
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| Research Abstract |
Microbial removal of heavy metals, especially cadmium, from agricultural and marine industrial wastes were examined. During sequential and mixed cultivation of proteolytic microbes and a strain of sulfate-educing bacteria in an extracts of each waste, heavy metals like cadmium were removed almost completely from the extract as the metal-sulfide precipitate. Whereas a ant amounts of heavy metals remained in the extract after the cultivation of proteolytic microbes or the sulfate-reducing bacterium alone.
These results suggested that heavy metals in agricultural and marine industrial wastes would be present as bound-state with heavy-metal-binding protein such as metallothionein and they would be transformed to the free-state by protease secreted by proteolytic microbes. And then metal-sulfide precipitates could be formed with the free-state of heavy metals and hydrogen sulfide produced by the sulfate-reducing bacterium. Availability of meal-free preparations as. feed were also examined.
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