Depth Stratification Leads to Distinct Zones of Manganese and Arsenic Contaminated Groundwater

2017 ◽  
Vol 51 (16) ◽  
pp. 8926-8932 ◽  
Author(s):  
Samantha C. Ying ◽  
Michael V. Schaefer ◽  
Alicea Cock-Esteb ◽  
Jun Li ◽  
Scott Fendorf
Keyword(s):  
Contaminated Groundwater ◽  
Depth Stratification

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.

Treatment Alternatives for Nitrate Contaminated Groundwater Supplies

1987 ◽  
Vol 17 (1) ◽  
pp. 65-75 ◽  
Author(s):  
Mohamed F. Dahab
Keyword(s):  
Contaminated Groundwater ◽  
Treatment Alternatives

FIELD-SCALE BIOREMEDIATION OF NATURALLY OCCURRING ARSENIC CONTAMINATED GROUNDWATER USING SULFATE REDUCING BACTERIA IN MACON COUNTY, ALABAMA

2018 ◽  
Author(s):  
Md Mahfujur Rahman ◽  
◽  
Ashraf Uddin ◽  
Ming-Kuo Lee ◽  
James A. Saunders ◽  
...  
Keyword(s):  
Sulfate Reducing Bacteria ◽  
Contaminated Groundwater ◽  
Field Scale ◽  
Sulfate Reducing ◽  
Naturally Occurring ◽  
Reducing Bacteria

BIOREMEDIATION OF ARSENIC CONTAMINATED GROUNDWATER IN A NATURAL SITE IN MACON COUNTY, ALABAMA

2019 ◽  
Author(s):  
Md Mahfujur Rahman ◽  
◽  
Ashraf Uddin ◽  
Ming-Kuo Lee
Keyword(s):  
Contaminated Groundwater ◽  
Natural Site

Treatment of Highly Contaminated Groundwater: A SITE Demonstration Project

2001 ◽  
Vol 11 (3) ◽  
pp. 63-72
Author(s):  
Daniel Sullivan ◽  
Michael Merdinger ◽  
William Kosco ◽  
Asim B. Ray
Keyword(s):  
Demonstration Project ◽  
Contaminated Groundwater ◽  
A Site

The Efficiency of Natural and Electrokinetic Enhanced Migration of Pb in Aquifer

2012 ◽  
Vol 253-255 ◽  
pp. 1098-1101
Author(s):  
Hong Tao Hu
Keyword(s):  
Heavy Metal ◽  
Removal Efficiency ◽  
Experimental Results ◽  
Contaminated Groundwater ◽  
Voltage Gradient ◽  
Migration Method ◽  
Variation Rule

The natural and electrokinetic enhanced migration method was studied by the experiments in groundwater contaminated by heavy metal Pb in this work. The experimental results showed that the variation rule of Pb reflected that its migration was weak and the removal efficiency was only 9.30% near the anode in the natural seepage condition, but under the enhanced migration and remediation function, the pollutants could be enriched and removed faster, thus the removal efficiency of Pb was 46.72% near the anode at the end of experiment when the experimental voltage gradient was 0.28V/cm, which made known that this electrokinetic enhanced migration of Pb in contaminated groundwater was more effective method than that of natural seepage migration and enhanced the removal of contaminant in aquifer.

scholarly journals Sustainable Chromium (VI) Removal from Contaminated Groundwater Using Nano-Magnetite-Modified Biochar via Rapid Microwave Synthesis

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 103
Author(s):  
Xiaoming Song ◽  
Yuewen Zhang ◽  
Nan Cao ◽  
Dong Sun ◽  
Zhipeng Zhang ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Microwave Treatment ◽  
Contaminated Groundwater ◽  
Maximum Adsorption Capacity ◽  
Intraparticle Diffusion Model ◽  
Adsorption Mechanisms ◽  
Chromium Vi ◽  
Modified Biochar ◽  
Pseudo Second Order ◽  
Nano Fe3o4

This study developed a nano-magnetite-modified biochar material (m-biochar) using a simple and rapid in situ synthesis method via microwave treatment, and systematically investigated the removal capability and mechanism of chromium (VI) by this m-biochar from contaminated groundwater. The m-biochar was fabricated from reed residues and magnetically modified by nano-Fe3O4. The results from scanning electron microscopy (SEM) and X-ray diffraction (XRD) characterisations confirmed the successful doping of nano-Fe3O4 on the biochar with an improved porous structure. The synthesised m-biochar exhibited significantly higher maximum adsorption capacity of 9.92 mg/g compared with that (8.03 mg/g) of the pristine biochar. The adsorption kinetics followed the pseudo-second-order model and the intraparticle diffusion model, which indicated that the overall adsorption rate of Cr(VI) was governed by the processes of chemical adsorption, liquid film diffusion and intramolecular diffusion. The increasing of the pH from 3 to 11 significantly affected the Cr(VI) adsorption, where the capabilities decreased from 9.92 mg/g to 0.435 mg/g and 8.03 mg/g to 0.095 mg/g for the m-biochar and pristine biochar, respectively. Moreover, the adsorption mechanisms of Cr(VI) by m-biochar were evaluated and confirmed to include the pathways of electrostatic adsorption, reduction and complexation. This study highlighted an effective synthesis method to prepare a superior Cr(VI) adsorbent, which could contribute to the effective remediation of heavy metal contaminations in the groundwater.

Remediation of 2,4-dichlorophenol-contaminated groundwater using nano-sized CaO2 in a two-dimensional scale tank

2020 ◽  
Vol 15 (5) ◽  
Author(s):  
Tianyi Li ◽  
Chengwu Zhang ◽  
Jingyi Zhang ◽  
Song Yan ◽  
Chuanyu Qin
Keyword(s):  
Contaminated Groundwater ◽  
Two Dimensional
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