Inhibition of biological TCE and sulphate reduction in the presence of iron nanoparticles

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

“…In contrast, an immediate inhibition after 1 week of the bacterial activity in the reactors amended with NF25 was already observed with the lowest tested dose (0.05 g L À1 ). In previous studies, nZVI concentration above 0.3 g L À1 was reported as completely inhibitory on biodegradation (Barnes et al, 2010). These results may suggest that oxido-reduction processes ongoing after addition of nZVI and high doses of mZVIs in the batch reactors without aquifer material as protecting niches for microorganisms will significantly inhibit bacterial activity (Tilston et al, 2013).…”

“…On the other hand, limited research has been conducted on potential impacts of fine ZVIs on anaerobic microorganisms relevant for the anaerobic subsurface environment and CAHs biodegradation processes (e.g. methanogens, sulfate reducing bacteria and CAH-degrading bacteria) (Barnes et al, 2010;Kirschling et al, 2010;Xiu et al, 2010;Kumar et al, 2014). As a consequence of no standardized ecotoxicity tests, impact of fine ZVIs on the saturated anaerobic subsurface was evaluated by following inhibition on contaminant removal and using molecular techniques (e.g.…”

Remediation of nitrate-contaminated water by solid-phase denitrification process—a review

“…Many soil microbes and useful bacterial communities have been reported to be toxicologically affected by iron nanoparticles (Lee et al 2008;Diao and Yao 2009;Barnes et al 2010a;Cullen et al 2011;Jiang et al 2013). The cell lysis was due to the outer coating of the cell with iron nanoparticles, reactive oxygen species generation, damage of cell membrane, and biological dechlorination (Auffan et al 2009;Xiu et al 2010;Barnes et al 2010b).…”

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).…”