Mutagenic fate of insecticide fenitrothion in the environment—mutagenicity increases both by anaerobic biodegradation and photodegradation

2008 ◽  
Vol 58 (3) ◽  
pp. 741-747
Author(s):  
T. Matsushita ◽  
Y. Matsui ◽  
S. Taniwaki ◽  
K. Ikeba
Keyword(s):  
Anaerobic Biodegradation ◽  
Aerobic Biodegradation ◽  
Bacterial Strains ◽  
Ames Assay

In the present study, our objectives were (1) using the Ames assay, to evaluate the change in mutagenicity of a fenitrothion-containing solution during aerobic biodegradation, anaerobic biodegradation, and photodegradation, and (2) to identify possible mutagenic transformed products (TPs) that contributed substantially to any increase in mutagenicity. Mutagenicity of the fenitrothion-containing solution did not increase during aerobic biodegradation with any of the tested bacterial strains. In contrast, the mutagenicity increased for strain YG1029 during anaerobic biodegradation because of the generation of a strongly mutagenic TP, amino-fenitrothion. During photodegradation, mutagenicities increased slightly for YG1021 and YG1024, possibly owing to the production of a previously unreported mutagenic TP.

Microbial degradation of petroleum hydrocarbons in estuarine sediment of Tama River in Tokyo urban aera

1997 ◽  
Vol 35 (8) ◽  
pp. 69-76 ◽  
Author(s):  
Akiko Yamane ◽  
Koji Sakakibara ◽  
Masaaki Hosomi ◽  
Akihiko Murakami
Keyword(s):  
Petroleum Hydrocarbons ◽  
Heterotrophic Bacteria ◽  
Anaerobic Biodegradation ◽  
Estuarine Sediment ◽  
Aerobic Biodegradation ◽  
Aerobic Degradation ◽  
Sediment Slurry ◽  
Normal Water ◽  
Hydrocarbon Utilizing Bacteria ◽  
Aerobic And Anaerobic

Aerobic and anaerobic biodegradation rates of petroleum hydrocarbons, i.e., hexadecane (HEX), phenanthrene (PHE), and anthracene (ANT), were determined in estuarine sediment of the Tama River in urban Tokyo, followed by estimating their respective degradation potential. While in a sediment slurry, the aerobic biodegradation rates of these petroleum hydrocarbons ranged from 40 to 70 μg·g−1 dry sediment· day−1. The anaerobic biodegradation rate of HEX was found to be 5 - 8 μg·g−1 dry sediment· day−1, whereas that of PHE and ANT could not be detected following a 2-month incubation. Aerobic degradation of HEX was not affected by coexistence with either PHE or ANT, nor by the salinity level. The number of HEX-, PHE-, or ANT-utilizing bacteria ranged from 5 - 10% of the total number of aerobic heterotrophic bacteria. We calculated their biodegradation potentials using the biomass of naturally existing petroleum hydrocarbon-utilizing bacteria present in the sampled sediment, with results for HEX, PHE, and ANT being 1.0 − 3.5, 4.2 × 10−2, and 1.2 × 10−2 − 9.4 × 10−1 μg·g−1 dry sediment· day−1, respectively. In the aerobic tidal sediment of the Tama River, the purification potentials of HEX, PHE, and ANT were assessed to be approximately equal to their accumulation potentials occurring at the normal water level.

scholarly journals Aerobic and Anaerobic Biodegradation of 1,2-Dibromoethane by a Microbial Consortium under Simulated Groundwater Conditions

2019 ◽  
Vol 16 (19) ◽  
pp. 3775 ◽  
Author(s):  
Qing Wang ◽  
Miaoyan Yang ◽  
Xin Song ◽  
Shiyue Tang ◽  
Lei Yu
Keyword(s):  
Microbial Consortium ◽  
Anaerobic Bacteria ◽  
Anaerobic Biodegradation ◽  
Aerobic Biodegradation ◽  
Two Phase ◽  
Electron Transfer Pathway ◽  
First Order Kinetics ◽  
Enhanced Biodegradation ◽  
Simulated Groundwater ◽  
Aerobic And Anaerobic

This study was conducted to explore the potential for 1,2-Dibromoethane (EDB) biodegradation by an acclimated microbial consortium under simulated dynamic groundwater conditions. The enriched EDB-degrading consortium consisted of anaerobic bacteria Desulfovibrio, facultative anaerobe Chromobacterium, and other potential EDB degraders. The results showed that the biodegradation efficiency of EDB was more than 61% at 15 °C, and the EDB biodegradation can be best described by the apparent pseudo-first-order kinetics. EDB biodegradation occurred at a relatively broad range of initial dissolved oxygen (DO) from 1.2 to 5.1 mg/L, indicating that the microbial consortium had a strong ability to adapt. The addition of 40 mg/L of rhamnolipid and 0.3 mM of sodium lactate increased the biodegradation. A two-phase biodegradation scheme was proposed for the EDB biodegradation in this study: an aerobic biodegradation to carbon dioxide and an anaerobic biodegradation via a two-electron transfer pathway of dihaloelimination. To our knowledge, this is the first study that reported EDB biodegradation by an acclimated consortium under both aerobic and anaerobic conditions, a dynamic DO condition often encountered during enhanced biodegradation of EDB in the field.

Aerobic biodegradation of trichloroethylene using a consortium of five bacterial strains

2003 ◽  
Vol 25 (22) ◽  
pp. 1925-1932 ◽  
Author(s):  
Liliana Meza ◽  
Teresa J. Cutright ◽  
Belal El-Zahab ◽  
Ping Wang
Keyword(s):  
Aerobic Biodegradation ◽  
Bacterial Strains

Aerobic biodegradation of N-nitrosodimethylamine (NDMA) by axenic bacterial strains

2005 ◽  
Vol 89 (5) ◽  
pp. 608-618 ◽  
Author(s):  
Jonathan O. Sharp ◽  
Thomas K. Wood ◽  
Lisa Alvarez-Cohen
Keyword(s):  
Aerobic Biodegradation ◽  
Bacterial Strains

scholarly journals Efficiency of aerobic biodegradation of beet molasses vinasse under non-controlled pH: conditions for betaine removal / Efektywność tlenowej biodegradacji buraczanego wywaru melasowego przy nieregulowanym pH podłoża: określenie warunków usunięcia betainy

2015 ◽  
Vol 41 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Agnieszka Ryznar-Luty ◽  
Edmund Cibis ◽  
Małgorzata Krzywonos ◽  
Tadeusz Miśkiewicz
Keyword(s):  
High Efficiency ◽  
Oxygen Demand ◽  
Aerobic Biodegradation ◽  
Batch Processes ◽  
Bacterial Strains ◽  
Beet Molasses ◽  
Initial Ph ◽  
Solids Separation ◽  
Soluble Chemical Oxygen Demand ◽  
Ph Conditions

Abstract The aim of the study was to establish such conditions that would provide high-efficiency aerobic biodegradation of beet molasses vinasse with a mixed culture of thermo- and mesophilic bacteria of the genus Bacillus in batch processes without controlling the pH of the medium. Particular consideration was given to the betaine removal (the main pollutant of vinasse), which accounted for as much as 37.6% of total organic carbon. Biodegradation was performed in a stirred tank reactor at 27-63°C with initial pH (pH0) of 6.5 and 8.0. Efficiency of biodegradation was expressed in terms of reduction in SCODsum, which is a sum of SCOD (soluble chemical oxygen demand, i.e. COD determined after suspended solids separation) and theoretical COD of betaine. The values achieved at 27 and 36°C with pH0 = 8.0 exceeded 77.7%, whereas those obtained at 36 and 45°C with pH0 = 6.5 were higher than 83.6%. The high biodegradation efficiency obtained in the four processes is attributable to the betaine removal by the bacterial strains used in the study. Maximal extent of reduction in SCODsum (85.41%), BOD5 (97.91%) and TOC (86.32%), and also the fastest rate of biodegradation (1.17 g O2/l∙h) was achieved at 36°C and pH0 = 8.0

Removal trends of sulfonamides and their ARGs during soil aquifer treatment and subsequent chlorination: effect of aerobic and anaerobic biodegradation

2020 ◽  
Vol 6 (9) ◽  
pp. 2331-2340 ◽  
Author(s):  
Kena Qin ◽  
Yan Chen ◽  
Jianju Li ◽  
Chonghua Xue ◽  
Liangliang Wei ◽  
...  
Keyword(s):  
Anaerobic Biodegradation ◽  
Aerobic Biodegradation ◽  
Soil Aquifer Treatment ◽  
Great Role ◽  
Aerobic And Anaerobic ◽  
Synthetic Water

Soil aquifer treatment significantly decreased the SA concentration in recharged synthetic water and aerobic biodegradation played a great role.

Sign in / Sign up

Export Citation Format

Share Document