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Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Nov 2009, 30 (6) BackEffect of applying biosolids on the biodegradation of toluene and naphthalene
contaminated soils 1Department
of Environmental Engineering, 3Center for Environmental Restoration
and Disaster Reduction, National Chung Shing
University, No. 250, Kuo Kuang Road, Taichung 402,
Taiwan, Republic of China 2Sinotech
Engineering Consultants, Inc. Environmental Nanking
E. Road, (Received: Abstract: Biosolids
contain nutrients, organic matters and micro-organisms that can provide soil
benefits. In this study, toluene and naphthalene-contaminated soils were used
to investigate the effect of applying biosolids on
the enhancement of the biodegradation rate. The oxygen uptake rate (OUR) was
determined with a respirometer and was used to
calculate the oxygen uptake percentage of substrate in biosolids
(a value) using a two-phase respirogram.
Experimental result showed that the application of biosolids
had positive effect on the enhancement of the biodegradation rate of toluene
and naphthalene in the contaminated soils. The biodegradation rates of toluene
and naphthalene were 15% and 20% in soils without applying biosolids,
respectively. With the biosolids, its biodegradation
rate for the two contaminants was about 4-fold higher in relative to control
and the maximum value occurred in a soil to biosolids
ratio as 1: 0.5. The a
value for toluene and naphthalene was in the levels of 10-20% which revealed
that the biosolids used in this study was mainly
composed by micro-organism. Key
word: Toluene, Naphthalene, Biosolids, Bubble respirometer,
2-phases respirogram ??????? PDF of full length paper
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