Use of CAH-degrading bacteria as test-organisms for evaluating the impact of fine zerovalent iron particles on the anaerobic subsurface environment

Role of oxidative stress in inactivation of Escherichia coli BW25113 by nanoscale zero-valent iron

“…Toxic effects of nZVI toward both Gram negative and Gram positive bacterial cells have also been reported (Auffan et al, 2008;Diao and Yao, 2009;Lee et al, 2008). The toxic effect of nZVI may impact beneficial indigenous microbes in environment such as contaminant degraders and element recyclers (Barnes et al, 2010;Jiang et al, 2013Jiang et al, , 2015Kumar et al, 2014;Tilston et al, 2013;Velimirovic et al, 2015;Zabetakis et al, 2015) since substantial amounts of these particles (a few hundred to several thousand pounds per injection) are directly released to the environment through the environmental remediation processes (Grieger et al, 2010;Mueller et al, 2012;USEPA, 2008;Watlington, 2005). Studies revealed that nZVI can potentially be used as a low-cost and high efficiency disinfectant for water (Chen et al, 2012;Diao and Yao, 2009).…”

Elucidating the dechlorination mechanism of hexachloroethane by Pd-doped zerovalent iron microparticles in dissolved lactic acid polymers using chromatography and indirect monitoring of iron corrosion

“…The laboratory results suggest that small (≈600 mg for [HCA] 0 = 5-20 mg L -1 ) amounts of Pd-mZVI in PLA are sufficient for a rapid and complete pollution degradation. The use of low doses of iron particles will limit the loss of ZVI due to its spontaneous corrosion in water, as well as reducing its inhibition effects on the microbial community for in situ remediation (Velimirovic et al 2015). Even if an increase in PLA content results in more acidic conditions, the effect may be less pronounced under field conditions depending on the natural buffering capacity of the aquifer.…”

The ecotoxic potential of a new zero-valent iron nanomaterial, designed for the elimination of halogenated pollutants, and its effect on reductive dechlorinating microbial communities

“…The formulation ingredients (coatings, suspending agents, stabilization materials) of NZVI preparations can also serve as a source of electron donors supporting biological dechlorination (He et al, 2010;Kirschling et al, 2010;Su et al, 2012;Wei et al, 2012). Despite toxic effects of NZVI on natural microflora and dechlorinating microorganisms (Barnes et al, 2010;Bruton et al, 2015;Kumar et al, 2014b;Velimirovic et al, 2015;Xiu et al, 2010aXiu et al, , 2010b, the combined use of abiotic dechlorination with NZVI and biological dechlorination can result in synergetic effects, positive for the remediation process (Bruton et al, 2015;He et al, 2010;Kocur et al, 2015;Su et al, 2012). High pH conditions developing during anaerobic ZVI corrosion as well as acidification due to fermentation of formulation ingredients being unfavourable for biological processes have to be taken into account during field applications (Bruton et al, 2015;Velimirovic et al, 2015).…”

“…On the other hand, hydrogen is consumed by hydrogenotrophic bacteria, acting as a sink for hydrogen and mitigating the problem of gas clogging. Moreover, hydrogen is an excellent electron donor for supporting biological reductive dechlorination (Bruton et al, 2015;Lohner et al, 2011;Lohner and Tiehm, 2009;Velimirovic et al, 2015). Biological reductive dechlorination represents an environmental friendly, sustainable and cost-efficient option for removal of e.g.…”