Paper Information

Journal:   INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH (IJER)   FALL 2014 , Volume 8 , Number 4; Page(s) 1271 To 1278.
 
Paper: 

ENHANCED BIOREMEDIATION OF FIELD AGRICULTURAL SOILS CONTAMINATED WITH PAHS AND OCPS

 
 
Author(s):  WANG C.P.*, LI J., JIANG Y., ZHANG Z.Y.
 
* MOE KEY LABORATORY OF POLLUTION PROCESS AND ENVIRONMENTAL CRITERIA, TIANJIN KEY LABORATORY OF ENVIRONMENTAL REMEDIATION AND POLLUTION CONTROL, COLLEGE OF ENVIRONMENT SCIENCE AND ENGINEERING, NANKAI UNIVERSITY, TIANJIN 300071, P.R. CHINA
 
Abstract: 

Effect of different concentrations of ammonium chloride (NCL) and ammonium nitrate (NN) and surfactants such as Tween-80, HPCD and rhamnolipids on the bioremediation of PAHs and OCPs was investigated. The results showed that the best optimum concentration of NCL and NN was 50 g·kg-1, and the PAHs degradation rate during 60 days of remediation was enhanced to 64.6% and 62.8% for NCL and NN, respectively, which was approximately 45, 17, 10% higher than those in the control group, soil only added microorganism, soil added microorganism and tourmaline. OCP removal rates were 51.7% and 50.4% for NCL and NN, respectively, which was 34% higher than the control group, 14% higher than the soil only added microorganism, 9% higher than the soil added microorganism and tourmaline. The best dose of Tween-80, HPCD and rhamnolipids was 2, 0.5 and 0.2 g·kg-1. When they were applied, the PAHs degradation rate during 60 days of remediation was enhanced to 69, 70.4 and 71.5%, respectively, which was approximately 52, 24 and 17% than those in the control group, soil only added microorganism, soil added microorganism and tourmaline. Similarly, OCP removal rate was 42, 26 and 16% higher than those in the control group, microorganism -added soil alone, soil added microorganism and tourmaline. Additionally, nutrients and surfactants can promote the generation of soil hydrogen peroxidase and invertase enzyme. Hence, the present study provides a promising combination remediation technology for the remediation of field soils contaminated by PAHs and OCPs.

 
Keyword(s): NUTRIENTS, SURFACTANTS, TOURMALINE, SOIL, REMEDIATION
 
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