| Co-Investigator(Kenkyū-buntansha) |
IKE Michihiko Faculty of Eng., Osaka Univ.Res.Assoc., 工学部, 助手 (40222856)
IWAHORI Keisuke Faculty of Eng., Osaka Univ.Res.Assoc., 工学部, 助手 (40183199)
FUJITA Masanori Faculty of Eng., Osaka Univ.Professor, 工学部, 教授 (70029289)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Research Abstract |
Biodegradation capabilities of acclimated marine nitrifying sludge (AMNS) for volatile aliphatic chlorinated hydrocarbons were experimentally investigated. AMNS had the capability to degrade chloroform (CF), trichloroethylene (TCE), 1,1,2-trichloroethane (1,1,2-TCA) and 1,1,2,2-tetrachloroethane but had not 1,1,1-trichloroethane and tetrachloroethylene (PCE) whose C-H bonds were highly substituted by chlorine atoms. Ammonia, which is the main substrate for nitrifiers, was required for the degradation of CF,TCE,1,1,2-TCA and PCA by AMNS.Carbon tetrachloride (CT) was degraded by the AMNS even under aerobic condition, but was demonstrated to be degraded by the anaerobic bacteria which exist in the anaerobic portion of AMNS floc. CT biodegradation was readily accomplished by the anaerbic bacteria which are widely distributed in various kinds of bacterial flocs. Four types of classification for the microbial degradation of volatile aliphatic chlorinated hydrocarbon were proposed based on their biodegradabilities and inhibitory effects on nitrification of AMNS.
By using immobilized AMNS pellets which were prepared by polyvinylalcohol (PVA), continuous nitrification treatment experiments of leachate from a sea-based solid waste disposal site were carried out and the removal profiles of phosphoric acid triesters were investigated. Tris (2-chloroethyl) phosphate (TCEP) and tris (3-chloropropyl) phosphate (TCPP), which have high water solubility, were effectively removed during the continuous nitrification experiments of leachate by AMNS immobilized pellets. Biodegradation of these phosphoric acid triesters by AMNS was demonstrated to occur with partial adsorption of these phosphoric acid triesters on PVA pellets.
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