Journal of Food, Agriculture and Environment
Vol 10,
Issue 3&4,2012
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Tests of modified Fenton’s reaction with urea peroxide on microbial influence and degradation of PAHs in migrated coking plant contaminated soil
Author(s):
Yue-Hua Zhang 1, 2,
Yong-Xun Zhao 2, Yu-Gang Sun 1, Chang-Hong Guo 1*Recieved Date: 2012-06-24, Accepted Date: 2012-09-30
Abstract:This experiment introduces the degradation of polycyclic aromatic hydrocarbons (PAHs) from the migrated coking plant contaminated soil by modified Fenton’s reaction with urea peroxide in laboratory column tests and subsequent aerobic biodegradation of PAHs by native bacteria during cultivation of the soil. The effect of CO(NH2)2·H2O2 addition for 4 and 10 days and saturation of soil with CO(NH2)2·H2O2 were investigated. In both tests the CO(NH2)2·H2O2 dosage was 0.8 g CO(NH2)2·H2O2/g soil. In completely CO(NH2)2·H2O2 saturated soil the removal of PAHs (44% within 4 days) by modified Fenton’s reaction with CO(NH2)2·H2O2 was uniform over the entire soil column. In non-uniformly saturated soil, PAHs removal was higher in completely saturated soil (52% in 10 days) compared to partially saturated soil with 25% in 2 weeks. The effect of the modified Fenton’s reaction with CO(NH2)2·H2O2 on the microbial activity in the soil was evaluated based on toxicity experiment with Vibrio fischeri NRRL B-11177, and viable and dead cells, microbial extra cellular enzyme activity, and oxygen consumption and carbon dioxide production during soil cultivation were determined. As the hydrogen peroxide urea is broken down into oxygen and nitrogen, the breeding of indigenous microorganisms was promoted. In the tests, the toxicity of column leachate with Vibrio fischeri NRRL B-11177 increased due to the modified Fenton’s reaction with CO(NH2)2·H2O2. Cultivation of soil in serum bottles at 20°C resulted in consumption of oxygen and formation of carbon dioxide, indicating aerobic biodegradation of organic compounds. In untreated soil 20-30% of the PAHs were biodegraded in 8 weeks of cultivation. Cultivation of biochemically treated soil slightly increased PAHs-removal compared to untreated soil.
Keywords:Biodegradation,
urea peroxide (UP), extracellular enzymes, modified Fenton’s reaction, in situ, polycyclic aromatic hydrocarbonsJournal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1483-1489
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