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Cost-effective remediation using microscale ZVI: comparison of commercially available products

Pavelková Alena, Stejskal Vojtěch, Vološčuková Ondřejka, Nosek Jaroslav

Ecological Chemistry and Engineering. S

2020

Vol. 27, nr 2

211--224

Zero-valent iron is very effective in the treatment of groundwater contaminated with chlorinated hydrocarbons and solvents broadly used in industrial production. In terms of its sustainability and cost, a legitimate effort has been devoted to the optimization of the remediation process, which can be demanding and expensive. In this study, the application potential and fundamental properties of several commercial micro-sized zero-valent iron (μZVI) were investigated. Although the manufacturers report the basic parameters of μZVI, it has been shown that the actual reactivity of apparently similar products varies notably. This work was focused on monitoring of frequently occurring contaminants. The actual contaminated water from the Pisecna locality -former landfill of industrial waste, with high levels of chlorinated ethenes and ethanes (PCE, TCE, cis-1,2-DCE and 1,2-DCA) was used for the experiment. The degree of dechlorination reached over 85 % 32 days after the application of μZVI in several samples and a far higher reaction rate for smaller particles was observed. Also, the amount of cis-1,2-DCE, which is characterized by slow decomposition, decreased by more than 95 % over the course of the experiment. Smaller particles showed a much longer sedimentation rate and gradual fractionation was also observed. Monitoring of ORP and pH also suggested that the smaller particles possessed a reduction capacity that was sufficiently high even at the end of the experiment. Laboratory tests with apparently similar μZVI samples indicated considerable differences in their reaction rate and efficiency.

Kosztowo-efektywne metody oczyszczania środowiska gruntowo-wodnego zanieczyszczonego substancjami ropopochodnymi lub chlorowcoorganicznymi na przykładzie projektu UPSOIL

Krupanek J., Kalisz M.

Chemik

2010

Vol. 64, nr 6

434-439

Pomimo dostępności wielu technik i technologii remediacji gruntu i wód podziemnych, dotychczasowe doświadczenia w zakresie rekultywacji terenów zdegradowanych wskazują wyraźnie na potrzebę dalszego ich rozwoju. Dotyczy to zwłaszcza skutecznego rozwoju technik bezinwazyjnych oczyszczania środowiska gruntowo- wodnego z zanieczyszczeń organicznych z uwzględnieniem perspektywy zrównoważonego podnoszenia jakości gleb i pełnej rehabilitacji ich funkcji. W tym względzie realizowanych jest wiele prac współfinansowanych przez Komisję Europejską. Należy do nich projekt 7 Programu Ramowego Unii Europejskiej UPSOIL, którego celem jest opracowanie metody efektywnie łączącej technologie chemiczne i biologiczne in situ oczyszczania gleb i wód podziemnych.

Despite current experiences, abundant knowledge and well developed remediation technologies, there still exists huge potential to raise effective ness of remediation; It concerns especially non-invasive in situ techniques for remediation of soil and groundwater contaminated with organic pollutants with perspective of sustainable soil quality improvement and its final full rehabilitation. In this area many EU funded projects are carried out. One of them is the EU Framework Program project UPSOIL which objective is to develop methods effectively coupling technologies of chemical and biological in situ remediation of soil and groundwater.