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Kuprina, Elena E.; Vodolazhskaya, S. V.; Nyanikova, G. G.

doi:10.1023/a:1025711925757

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…However, this effect has also been shown to be “species-specific” in studies with gram-negative and gram-positive bacteria 46,51 . Other possible mechanisms include direct oxidation of polysaccharides at the anode 52 , protein extraction (cleavage of disulfide and/or peptide bonds due to the discharge of water and dissolved oxygen molecules) at the cathode 53 , or reductive hydrogen peroxide production at the cathode 30 . It is difficult to isolate a specific mechanism of the observed inactivation (Fig.…”

Section: Resultsmentioning

confidence: 99%

Inactivation of Rhizoctonia solani in fertigation water using regenerative in situ electrochemical hypochlorination

Lévesque

Graham

Bejan³

et al. 2019

Sci Rep

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The capture and re-use of greenhouse fertigation water is an efficient use of fertilizer and limited water resources, although the practice is not without risk. Plant pathogens and chemical contaminants can build up over successive capture and re-use cycles; if not properly managed they can lead to reduced productivity or crop loss. There are numerous established and emerging water treatment technologies available to treat fertigation water. Electrochemical processes are emerging as effective means for controlling pathogens via in situ regenerative hypochlorination; a process that is demonstrated here to achieve pathogen control in fertigation solutions without leading to the accumulation of potentially phytotoxic free chlorine residuals associated with other chlorination processes. An electrochemical flow cell (EFC) outfitted with ruthenium dioxide (RuO2) dimensionally stable anodes (DSA) was characterized and evaluated for free chlorine production and Rhizoctonia solani inactivation in both irrigation and fertigation solutions. Pathogen inactivation was achieved at low current densities and short residence or cell contact times. Effluent free chlorine concentrations were significantly lower than commonly reported phytotoxic threshold values (approximately 2.5 mg/L) when fertilizer (containing ammonium) was present in the test solution; an effect attributable to reactions associated with breakpoint chlorination, including chloramine formation, as well as the presence of other oxidizable compounds in the fertilizer. Chloride concentrations were stable under the test conditions suggesting that the EFC was operating as a regenerative in situ electrochemical hypochlorination system. No significant changes to macronutrient concentrations were found following passage through the EFC.

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