Isolation, Screening and Growth of Monoaromatic Hydrocarbon Utilising Bacteria
A total of 131 isolates originating from different soils were obtained through enrichment and direct plating methods using 0.1% (v/v) of either benzene, toluene or mixture of benzene and toluene as their sole energy and carbon sources. Most of the isolates were from S5 (garden soil) and the least...
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| 格式: | Thesis |
| 语言: | English English |
| 出版: |
1998
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| 主题: | |
| 在线阅读: | http://psasir.upm.edu.my/id/eprint/9432/1/FSAS_1998_23_A.pdf |
| 总结: | A total of 131 isolates originating from different soils were obtained through
enrichment and direct plating methods using 0.1% (v/v) of either benzene, toluene or
mixture of benzene and toluene as their sole energy and carbon sources. Most of the
isolates were from S5 (garden soil) and the least from SI (ESSO refinery soil)
obtained by the enrichment culture method. Out of this, 107 motphologicaUy different
isolates were rescreened in 1% (v/v) of their respective hydrocarbon of either benzene
or toluene. Out of the 34 good isolates grown in varying hydrocarbon concentrations
ul> to 50% (v/v), 23 gave good and moderate growth. These isolates were further
grown in different concentrations of BTEX. Six isolates (145yw, 113i, 205y, 205w, 113 & 146) exhibited good growth withstanding up to 75 % (v/v) concentration of
BTEX. The isolates were also able to grow in 0.4 M NaCl (35 p.s.u.) which is
equivalent to sea salinity level. Studies done on the 3 isolates (145yw, 113i & 205y)
showed that they were metabolically active throughout their growth in the hydrocarbon
spiked media deduced from the !NT stain test, increased oxygen consumption and
increased plate COWlts. High colony fonning Wlits / mL percentage (50% or more)
were obsetVed in different organic solvents of varying log P values. Isolate 145yw
gave the highest growth rate of 0.22 ht in 0.1% (v/v) benzene. Biodegradability of the
isolates were further confinned by positive CO2 production and the reduction in the
hydrocarbon peaks obsetVed by GC. Extensive degradative profiles were obtained with
isolate 113i and mixed culture. Laboratory biodegradation studies showed that all the 3
isolates were able to grow in both single and mixture of site samples. |
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