scholarly journals Application of Combined In Situ Chemical Reduction and Enhanced Bioremediation to Accelerate TCE Treatment in Groundwater

2021 ◽  
Vol 11 (18) ◽  
pp. 8374
Author(s):  
Min-Hsin Liu ◽  
Chung-Ming Hsiao ◽  
Chih-En Lin ◽  
Jim Leu
Keyword(s):  
Ph Value ◽  
Chemical Reduction ◽  
Test Site ◽  
Electron Donors ◽  
Pilot Test ◽  
In Situ Bioremediation ◽  
Oil Emulsion ◽  
Emulsified Oil ◽  
Tce Degradation

Groundwater at trichloroethylene (TCE)-contaminated sites lacks electron donors, which prolongs TCE’s natural attenuation process and delays treatment. Although adding electron donors, such as emulsified oil, accelerates TCE degradation, it also causes the accumulation of hazardous metabolites such as dichloroethylene (DCE) and vinyl chloride (VC). This study combined in situ chemical reduction using organo-iron compounds with enhanced in situ bioremediation using emulsified oil to accelerate TCE removal and minimize the accumulation of DCE and VC in groundwater. A self-made soybean oil emulsion (SOE) was used as the electron donor and was added to liquid ferrous lactate (FL), the chemical reductant. The combined in situ chemical reduction and enhanced in situ bioremediation achieved favorable results in a laboratory microcosm test and in an in situ biological field pilot test. Both tests revealed that SOE+FL accelerated TCE degradation and minimized the accumulation of DCE and VC to a greater extent than SOE alone after 160 days of observation. When FL was added in the microcosm test, the pH value decreased from 6.0 to 5.5; however, during the in situ biological pilot test, the on-site groundwater pH value did not exhibit obvious changes. Given the geology of the in situ pilot test site, the SOE+FL solution that was injected underground continued to be released for at least 90 days, suggesting that the solution’s radius of influence was at least 5 m.

A Pilot Test of Passive Oxygen Release for Enhancement of In Situ Bioremediation of BTEX-Contaminated Ground Water

1997 ◽  
Vol 17 (2) ◽  
pp. 93-105 ◽  
Author(s):  
Steven W. Chapman ◽  
Brian T. Byerley ◽  
David J. A. Smyth ◽  
Douglas M. Mackay
Keyword(s):  
Ground Water ◽  
Pilot Test ◽  
Oxygen Release ◽  
In Situ Bioremediation

scholarly journals Modeling and simulation of in situ bioremediation for TCE-contaminated groundwater through methane injection in Kimitsu city, Japan

2006 ◽  
Vol 6 (2) ◽  
pp. 253-259 ◽  
Author(s):  
S.O. Soda ◽  
M. Kitagawa ◽  
M. Fujita
Keyword(s):  
Competitive Inhibition ◽  
Model Simulation ◽  
Monod Kinetics ◽  
In Situ Bioremediation ◽  
One Dimensional ◽  
Monitoring Wells ◽  
Advection Dispersion ◽  
Degradation Ratio ◽  
Tce Degradation

A one-dimensional model was developed for simulating the in situ bioremediation process in which trichloroethylene (TCE) in groundwater was transformed cometabolically by methanotrophs. The model includes basic processes such as advection, dispersion, and equilibrium sorption of methane, dissolved oxygen, methanotrophs, and TCE. Monod kinetics with a modified competitive inhibition term between methane and TCE, cell inactivation by product toxicity from TCE transformation, and deactivation of the enzyme in the absence of methane were also incorporated into this model. Simulation results were compared with data from a pilot biostimulation test performed at the Kururi site in Japan in 1998. The calibrated model provided good matches to observed changes of the chemical and the most-probable numbers of methanotrophs at the two monitoring wells for the 180 day test. Spatial distribution of the variables and the TCE degradation ratio were also evaluated using the calibrated model.

In Situ Bioremediation of Perchlorate in Vadose Zone Soil Using Gaseous Electron Donors: Microcosm Treatability Study

2010 ◽  
Vol 82 (5) ◽  
pp. 409-417 ◽  
Author(s):  
Hua Cai ◽  
Alessia G. Eramo ◽  
Patrick J. Evans ◽  
Rodney Fricke ◽  
Rachel A. Brennan
Keyword(s):  
Vadose Zone ◽  
Electron Donors ◽  
In Situ Bioremediation ◽  
Gaseous Electron

In situ bioremediation of cyanide, PAHs and organic compounds using an engineered SEquenced REactive BARrier (SEREBAR)

2006 ◽  
Vol 14 (2) ◽  
pp. 478-482
Author(s):  
Jamie Robinson ◽  
Russell Thomas ◽  
Steve Wallace ◽  
Paddy Daly ◽  
Robert Kalin
Keyword(s):  
Organic Compounds ◽  
In Situ Bioremediation ◽  
Reactive Barrier

Functional Poly(p-Xylylene)s via Chemical Reduction of Poly(p-Phenylene Vinylene)s

2019 ◽  
Author(s):  
Ain Uddin ◽  
Weifan Sang ◽  
Yong Gao ◽  
Kyle Plunkett
Keyword(s):  
Film Formation ◽  
Chemical Reduction ◽  
Water Soluble ◽  
Phenylene Vinylene ◽  
Polymer Modification ◽  
Polymer Backbone ◽  
Crosslinking Process ◽  
Conducting Membranes ◽  
In Situ Crosslinking

The synthesis of poly(p-xylylene)s (PPXs) with sidechains containing alkyl bromide functionality, and their post-polymer modification, is described. The PPXs were prepared by a diimide hydrogenation of poly(p-phenylene vinylene)s (PPVs) that were originally synthesized by a Gilch polymerization. The polymer backbone reduction was carried out with hydrazine hydrate in toluene at 80 °C to provide polymers with the sidechain-containing bromide functionality intact. To demonstrate post-polymer modification of the sidechains, the resulting PPX polymers were modified with trimethylamine to form tetraalkylammonium ion functionality and were evaluated as anion conducting membranes. While PPX homopolymers containing tetralkylammonium ions were completely water soluble and not able to form valuable films, PPX copolymers containing mixed tetraalkylammonium ions and hydrophobic chains were capable of film formation and alkaline stability. In addition, an in situ crosslinking process that used N,N,N',N'-tetramethyl-1,6-hexanediamine during the tetraalkylammonium formation of brominated PPX polymers was also evaluated and gave reasonable films with conductivities of ~10 mS-cm-1.

Functional Poly(p-Xylylene)s via Chemical Reduction of Poly(p-Phenylene Vinylene)s

2019 ◽  
Author(s):  
Ain Uddin ◽  
Weifan Sang ◽  
Yong Gao ◽  
Kyle Plunkett
Keyword(s):  
Film Formation ◽  
Chemical Reduction ◽  
Water Soluble ◽  
Phenylene Vinylene ◽  
Polymer Modification ◽  
Polymer Backbone ◽  
Crosslinking Process ◽  
Conducting Membranes ◽  
In Situ Crosslinking

The synthesis of poly(p-xylylene)s (PPXs) with sidechains containing alkyl bromide functionality, and their post-polymer modification, is described. The PPXs were prepared by a diimide hydrogenation of poly(p-phenylene vinylene)s (PPVs) that were originally synthesized by a Gilch polymerization. The polymer backbone reduction was carried out with hydrazine hydrate in toluene at 80 °C to provide polymers with the sidechain-containing bromide functionality intact. To demonstrate post-polymer modification of the sidechains, the resulting PPX polymers were modified with trimethylamine to form tetraalkylammonium ion functionality and were evaluated as anion conducting membranes. While PPX homopolymers containing tetralkylammonium ions were completely water soluble and not able to form valuable films, PPX copolymers containing mixed tetraalkylammonium ions and hydrophobic chains were capable of film formation and alkaline stability. In addition, an in situ crosslinking process that used N,N,N',N'-tetramethyl-1,6-hexanediamine during the tetraalkylammonium formation of brominated PPX polymers was also evaluated and gave reasonable films with conductivities of ~10 mS-cm-1.

In Situ Bioremediation of Perchlorate in Groundwater

2009 ◽  
Author(s):  
Paul Hatzinger ◽  
Jay Diebold
Keyword(s):  
In Situ Bioremediation

On-site and in situ bioremediation of wood-preservative contaminated groundwater

2000 ◽  
Vol 42 (5-6) ◽  
pp. 371-376 ◽  
Author(s):  
J.A. Puhakka ◽  
K.T. Järvinen ◽  
J.H. Langwaldt ◽  
E.S. Melin ◽  
M.K. Männistö ◽  
...  
Keyword(s):  
Iron Oxidation ◽  
Wood Preservative ◽  
Pilot Scale ◽  
High Rate ◽  
Contaminated Groundwater ◽  
Groundwater Temperature ◽  
In Situ Bioremediation ◽  
Contaminated Aquifer ◽  
Fluidized Bed Process

This paper reviews ten years of research on on-site and in situ bioremediation of chlorophenol contaminated groundwater. Laboratory experiments on the development of a high-rate, fluidized-bed process resulted in a full-scale, pump-and-treat application which has operated for several years. The system operates at ambient groundwater temperature of 7 to 9°C at 2.7 d hydraulic retention time and chlorophenol removal efficiencies of 98.5 to 99.9%. The microbial ecology studies of the contaminated aquifer revealed a diverse chlorophenol-degrading community. In situ biodegradation of chlorophenols is controlled by oxygen availability, only. Laboratory and pilot-scale experiments showed the potential for in situ aquifer bioremediation with iron oxidation and precipitation as a potential problem.

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