Hydrogen Sulfide Gas Treatment of Cr(VI)-Contaminated Sediment Samples from a Plating-Waste Disposal SiteImplications for in-Situ Remediation

1999 ◽  
Vol 33 (22) ◽  
pp. 4096-4101 ◽  
Author(s):  
Edward C. Thornton ◽  
James E. Amonette
Keyword(s):  
Hydrogen Sulfide ◽  
Waste Disposal ◽  
In Situ Remediation ◽  
Contaminated Sediment ◽  
Gas Treatment ◽  
Sediment Samples

scholarly journals Chemical Degradation of PCDD/F in Contaminated Sediment

2016 ◽  
Vol 23 (3) ◽  
pp. 473-482 ◽  
Author(s):  
Pavel Hrabák ◽  
Martina Homolková ◽  
Stanisław Wacławek ◽  
Miroslav Černík
Keyword(s):  
Iron Nanoparticles ◽  
Chemical Degradation ◽  
Contaminated Sites ◽  
In Situ Remediation ◽  
Contaminated Sediment ◽  
High Oxidation State ◽  
High Oxidation ◽  
Zero Valent Iron Nanoparticles ◽  
Toxicity Equivalent

Abstract Due to the extreme toxicity of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F), the remediation of PCDD/F aquifer source zones is greatly needed; however, it is very difficult due to their persistence and recalcitrance. The potential degradability of PCDD/F bound to a real matrix was studied in five systems: iron in a high oxidation state (ferrate), zero-valent iron nanoparticles (nZVI), palladium nanopowder (Pd), a combination of nZVI and Pd, and persulfate (PSF). The results were expressed by comparing the total toxicity of treated and untreated samples. This was done by weighting the concentrations of congeners (determined using a standardized GC/HRMS technique) by their defined toxicity equivalent factors (TEF). The results indicated that only PSF was able to significantly degrade PCDD/F. Toxicity in the system decreased by 65% after PSF treatment. Thus, we conclude that PSF may be a potential solution for in-situ remediation of soil and groundwater at PCDD/F contaminated sites.

scholarly journals Experimental Study on In-situ Remediation of Compound Contaminated Sediment of a River in Shenzhen with Chemicals

2021 ◽  
Vol 248 ◽  
pp. 01003
Author(s):  
Wang De-yong ◽  
Wang Jing ◽  
Zeng Qing-jun ◽  
Deng Kai-fang
Keyword(s):  
Organic Matter Content ◽  
Ammonia Nitrogen ◽  
Matter Content ◽  
In Situ Remediation ◽  
Contaminated Sediment ◽  
Overlying Water ◽  
In Situ Oxidation ◽  
Chemical Agents ◽  
In Situ Repair

Aiming at the black and odor problem of the gushing water and sediment of a river in Shenzhen, based on the results of sampling and testing, we independently developed an in-situ oxidation remediation agent for polluted sediment composed of oxidants, flocculants and pH regulators, and carried out in-situ repair of chemical agents without and with overlying water indoor test to verify. The test and monitoring results show that the agent can not only significantly reduce the ammonia nitrogen and organic matter content in the bottom sludge, but also can better remove the ammonia nitrogen in the overlying black and odorous water. In order to get closer to the actual situation, using the reagents developed to repair contaminated sediments at a certain flow rate has also achieved good experimental results.

Development of Simulators for In Situ Remediation Evaluation, Design, and Operation

2001 ◽  
Author(s):  
Mark S. Dortch ◽  
Christian J. McGrath ◽  
John J. Nitao ◽  
Mark A. Widdowson ◽  
Steve Yabusaki
Keyword(s):  
In Situ Remediation ◽  
Evaluation Design
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