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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Nov 2009, 30 (6)                                     Back


abstract_09

Effect of applying biosolids on the biodegradation of toluene and

naphthalene contaminated soils

 

Hung Yueh Chang1, Jui Min Hung*1, Yeong Shing Wu2, Yi Ru Lin1, Hung Yu Lai3 and Chih Jen Lu1, 3

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 Engineering Research Center, Taiwan, No. 171, Sec. 5,

Nanking E. Road, Taipei 105, Taiwan, Republic of China

 

(Received: May 26, 2007; Revised received: March 15, 2008; Accepted: May 15, 2008)

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 is available online

 

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