Pulsed gas injection: A minimum effort approach for enhanced natural attenuation of chlorobenzene in contaminated groundwater

2009 ◽  
Vol 157 (7) ◽  
pp. 2011-2018 ◽  
Author(s):  
Gerd Ulrich Balcke ◽  
Heidrun Paschke ◽  
Carsten Vogt ◽  
Mario Schirmer
Keyword(s):  
Natural Attenuation ◽  
Gas Injection ◽  
Contaminated Groundwater

Robustness of an aerobic metabolically vinyl chloride degrading bacterial enrichment culture

2011 ◽  
Vol 64 (9) ◽  
pp. 1796-1803 ◽  
Author(s):  
He-Ping Zhao ◽  
Kathrin R. Schmidt ◽  
Svenja Lohner ◽  
Andreas Tiehm
Keyword(s):  
Vinyl Chloride ◽  
Natural Attenuation ◽  
Enrichment Culture ◽  
Contaminated Sites ◽  
Contaminated Groundwater ◽  
Chlorinated Ethene ◽  
Equimolar Concentration ◽  
Bacterial Enrichment ◽  
Ph Tolerance

Degradation of the lower chlorinated ethenes is crucial to the application of natural attenuation or in situ bioremediation on chlorinated ethene contaminated sites. Recently, within mixtures of several chloroethenes as they can occur in contaminated groundwater inhibiting effects on aerobic chloroethene degradation have been shown. The current study demonstrated that metabolic vinyl chloride (VC) degradation by an enrichment culture originating from groundwater was not affected by an equimolar concentration (50 μM) of cis-1,2-dichloroethene (cDCE). Only cDCE concentrations at a ratio of 2.4:1 (initial cDCE to VC concentration) caused minor inhibition of VC degradation. Furthermore, the degradation of VC was not affected by the presence of trans-1,2-dichloroethene (tDCE), 1,1-dichloroethene (1,1-DCE), trichloroethene (TCE), and tetrachloroethene (PCE) in equimolar concentrations (50 μM). Only cDCE and tDCE were cometabolically degraded in small amounts. The VC-degrading culture demonstrated a broad pH tolerance from 5 to 9 with an optimum between 6 and 7. Results also showed that the culture could degrade VC concentrations up to 1,800 μM (110 mg/L).

Research on Natural Attenuation of BTEX and Changes of Redox Environment in the Process

2011 ◽  
Vol 183-185 ◽  
pp. 715-719
Author(s):  
Yan Su ◽  
Yong Sheng Zhao ◽  
Rui Zhou ◽  
Xiao Wang ◽  
Sheng He
Keyword(s):  
Natural Attenuation ◽  
Redox Reactions ◽  
Electron Acceptors ◽  
Redox Condition ◽  
Redox Conditions ◽  
Contaminated Groundwater ◽  
Oxidation Condition ◽  
Micro Organisms ◽  
Reducing Condition ◽  
Over Time

Natural attenuation of BTEX and characteristics of the water in the study are researched in this paper. The study not only obtain the attenuation rules of BTEX over time, but also the rules of the redox materials of the contaminated groundwater over time. From the study, we reach conclusion that the redox conditions is changed with the increasing pollution of BTEX and the oxidation condition changes into reducing condition. With the changing of the redox condition, there take place a variety of redox reactions. The materials of oxidation, such as O2, NO3-, Fe3+and SO42-, are transformed into reduction materials, such as NO2-, Fe2+, S2- and so on. In this process, the components of BTEX are degradated by micro-organisms which using the oxidation materials as electron acceptors.

Microcosms-experiments to assess the potential for natural attenuation of contaminated groundwater

2001 ◽  
Vol 35 (3) ◽  
pp. 720-728 ◽  
Author(s):  
Katrin Althoff ◽  
Matthias Mundt ◽  
Adolf Eisentraeger ◽  
Wolfgang Dott ◽  
Juliane Hollender
Keyword(s):  
Natural Attenuation ◽  
Contaminated Groundwater

scholarly journals Bacterial Community Dynamics in Dichloromethane-Contaminated Groundwater Undergoing Natural Attenuation

2017 ◽  
Vol 8 ◽  
Author(s):  
Justin Wright ◽  
Veronica Kirchner ◽  
William Bernard ◽  
Nikea Ulrich ◽  
Christopher McLimans ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Natural Attenuation ◽  
Community Dynamics ◽  
Contaminated Groundwater ◽  
Bacterial Community Dynamics

A feasibility study for the treatment of 1,2-dichloroethane-contaminated groundwater using reedbed system and assessment of its natural attenuation

2022 ◽  
pp. 152799
Author(s):  
Fazli Rahim ◽  
Siti Rozaimah Sheikh Abdullah ◽  
Hassimi Abu Hassan ◽  
Setyo Budi Kurniawan ◽  
Alias Mamat ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Natural Attenuation ◽  
Contaminated Groundwater
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