Effects of nitrosation on the formation of cyanide in publicly owned treatment works secondary effluent

Water Environment Research : a Research Publication of the Water Environment Federation
Anping ZhengRichard G Luthy

Abstract

Cyanide has been detected in the effluents of some publicly owned treatment works (POTWs) at levels exceeding the influent concentration. The presence of nitrite ion (NO2-) as a common constituent in domestic wastewater effluents may play an important role in the formation of cyanide through reaction with certain kinds of organic compounds, especially aromatic compounds. Laboratory studies with seven organic compounds (aniline. p-toluidine, phenol, 1,2,4-trihydroxybenzene, L-serine, glycine, and benzoic acid) revealed that cyanide can be formed by reaction of nitrite with some of these compounds. The most substantial free cyanide (HCN. CN-) production observed at 25 degrees C was 0.15 mg/L from reaction of 0.01 mM 1.2.4-trihydroxybenze with 5 mg/L nitrite for 72 hours. Substantial free cyanide formation was also observed at pH 2-4 in experiments with POTW effluents when reactive organics and nitrite were both added to wastewater. Formation of cyanide through nitrosation was strongly pH dependent, being most significant at low pH (2 to 4) and negligible at neutral-to-high pH. This result points to nitrous acid (HNO2) as being more reactive than the dissociated NO2- ion. The reaction of these nitrite species with organics also oc...Continue Reading

Citations

Feb 8, 2008·Water Environment Research : a Research Publication of the Water Environment Federation·Joseph KhouryJames Stahl
Nov 21, 2009·Environmental Science & Technology·Stuart W KrasnerGary Amy
Dec 3, 2015·Chemical Reviews·Sasho GligorovskiDavide Vione
Sep 25, 2021·Journal of Agricultural and Food Chemistry·Michaela MalečkováJana Sobotníková

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