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Effects of Nitrosation on the Formation of Cyanide in Publicly Owned Treatment Works Secondary Effluent
Author(s) -
Zheng Anping,
Dzombak David A.,
Zheng Richard G.
Publication year - 2004
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143004x141735
Subject(s) - cyanide , chemistry , nitrite , effluent , nitrosation , sulfamic acid , nitrous acid , wastewater , inorganic chemistry , ammonium , aniline , benzoic acid , sulfanilic acid , environmental chemistry , nuclear chemistry , organic chemistry , nitrate , environmental engineering , engineering
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 (NO 2 − 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°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 (HNO 2 ) as being more reactive than the dissociated NO 2 − ion. The reaction of these nitrite species with organics also occurs in conventional analyses for total cyanide which involve distillation under strongly acidic conditions. Sufficient sample pretreatment with sulfamic acid at the time of sampling, not at the time of analysis, is highly recommended to prevent biasing analytical measurement of total cyanide in POTW effluents.