scholarly journals Cometabolic Degradation of Dibenzofuran and Dibenzothiophene by a Newly Isolated Carbazole-Degrading Sphingomonas sp. Strain

2007 ◽  
Vol 73 (9) ◽  
pp. 2832-2838 ◽  
Author(s):  
Zhonghui Gai ◽  
Bo Yu ◽  
Li Li ◽  
Ying Wang ◽  
Cuiqing Ma ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Contaminated Soil ◽  
Sole Source ◽  
Ring Cleavage ◽  
Cometabolic Degradation ◽  
Angular Dioxygenation ◽  
Petroleum Contaminated Soil

ABSTRACT A carbazole-utilizing bacterium was isolated by enrichment from petroleum-contaminated soil. The isolate, designated Sphingomonas sp. strain XLDN2-5, could utilize carbazole (CA) as the sole source of carbon, nitrogen, and energy. Washed cells of strain XLDN2-5 were shown to be capable of degrading dibenzofuran (DBF) and dibenzothiophene (DBT). Examination of metabolites suggested that XLDN2-5 degraded DBF to 2-hydroxy-6-(2-hydroxyphenyl)-6-oxo-2,4-hexadienic acid and subsequently to salicylic acid through the angular dioxygenation pathway. In contrast to DBF, strain XLDN2-5 could transform DBT through the ring cleavage and sulfoxidation pathways. Sphingomonas sp. strain XLDN2-5 could cometabolically degrade DBF and DBT in the growing system using CA as a substrate. After 40 h of incubation, 90% of DBT was transformed, and CA and DBF were completely removed. These results suggested that strain XLDN2-5 might be useful in the bioremediation of environments contaminated by these compounds.

scholarly journals Novel Pathway for the Degradation of 2-Chloro-4-Nitrobenzoic Acid by Acinetobacter sp. Strain RKJ12

2011 ◽  
Vol 77 (18) ◽  
pp. 6606-6613 ◽  
Author(s):  
Dhan Prakash ◽  
Ravi Kumar ◽  
R. K. Jain ◽  
B. N. Tiwary
Keyword(s):  
Salicylic Acid ◽  
Tricarboxylic Acid Cycle ◽  
Sole Source ◽  
Degradation Pathway ◽  
Ring Cleavage ◽  
Muconic Acid ◽  
Content Type ◽  
Nitrobenzoic Acid ◽  
Catabolic Genes ◽  
Catechol 1,2 Dioxygenase

ABSTRACTThe organismAcinetobactersp. RKJ12 is capable of utilizing 2-chloro-4-nitrobenzoic acid (2C4NBA) as a sole source of carbon, nitrogen, and energy. In the degradation of 2C4NBA by strain RKJ12, various metabolites were isolated and identified by a combination of chromatographic, spectroscopic, and enzymatic activities, revealing a novel assimilation pathway involving both oxidative and reductive catabolic mechanisms. The metabolism of 2C4NBA was initiated by oxidativeorthodehalogenation, leading to the formation of 2-hydroxy-4-nitrobenzoic acid (2H4NBA), which subsequently was metabolized into 2,4-dihydroxybenzoic acid (2,4-DHBA) by a mono-oxygenase with the concomitant release of chloride and nitrite ions. Stoichiometric analysis indicated the consumption of 1 mol O2per conversion of 2C4NBA to 2,4-DHBA, ruling out the possibility of two oxidative reactions. Experiments with labeled H218O and18O2indicated the involvement of mono-oxygenase-catalyzed initial hydrolytic dechlorination and oxidative denitration mechanisms. The further degradation of 2,4-DHBA then proceeds via reductive dehydroxylation involving the formation of salicylic acid. In the lower pathway, the organism transformed salicylic acid into catechol, which was mineralized by theorthoring cleavage catechol-1,2-dioxygenase tocis, cis-muconic acid, ultimately forming tricarboxylic acid cycle intermediates. Furthermore, the studies carried out on a 2C4NBA−derivative and a 2C4NBA+transconjugant demonstrated that the catabolic genes for the 2C4NBA degradation pathway possibly reside on the ∼55-kb transmissible plasmid present in RKJ12.

Petroleum-contaminated soil: using sonolysis to improve mineralization and biodegradation potential of Fenton reaction and ozonolysis process

2021 ◽  
Author(s):  
Renan C. Testolin ◽  
Luciana Mater ◽  
Ramaiana Radetski-Silva ◽  
Eric Sanches-Simões ◽  
Wendell Pimentel-Almeida ◽  
...  
Keyword(s):  
Contaminated Soil ◽  
Fenton Reaction ◽  
Petroleum Contaminated Soil

scholarly journals Biochar as a sustainable product for remediation of petroleum contaminated soil

2021 ◽  
Vol 4 ◽  
pp. 100055
Author(s):  
Mohammad Ali Zahed ◽  
Samira Salehi ◽  
Rozita Madadi ◽  
Faranak Hejabi
Keyword(s):  
Contaminated Soil ◽  
Petroleum Contaminated Soil ◽  
Sustainable Product

Phytoremediation of Petroleum-Contaminated Soil

2011 ◽  
Vol 356-360 ◽  
pp. 2737-2740
Author(s):  
Chun Rong Li ◽  
Abao Wei ◽  
Tao Chen
Keyword(s):  
Field Experiment ◽  
Contaminated Soil ◽  
Control Area ◽  
Degradation Kinetic ◽  
Degradation Rates ◽  
Petroleum Contaminated Soil

Corn, sunflower and alfalfa were taken as remediation plants. Their phytoremediation and degradation kinetic of petroleum were investigated under field experiment. The results indicated that petroleum degradation rates of corn, sunflower and alfalfa remediation areas reached 42.5%, 46.4% and 44.7% after 150 days of remediation, which were increased by 100.5%, 118.9% and 110.8% compared with that in control area, respectively. Petroleum degradation rates of sunflower remediation areas﹥alfalfa remediation areas’﹥corn remediation areas’, whose half-lifes were 165d, 182d and 193d, respectively, which were decreased by 297d, 279d and 269d compared with that in control area, respectively. The remediation effects of corn, sunflower and alfalfa were obvious.

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