Making chlorine greener: performance of alternative dechlorination agents in wastewater.
Chemosphere
; 60(3): 381-8, 2005 Jul.
Article
en En
| MEDLINE
| ID: mdl-15924957
ABSTRACT
The residual chlorine in chlorine-disinfected and dechlorinated wastewater was characterized using a liquid chromatograph that was switched between reversed-phase separation and flow injection analysis modes, permitting measurement of fractionated and total residual chlorine, respectively. Residuals were detected in the effluent of an operating wastewater treatment plant employing chlorine disinfection and sulfite dechlorination. Despite dechlorination, an estimated total residual chlorine of 3 microM (0.2 ppm as Cl2) was detected in the effluent. To improve dechlorination effectiveness, four alternative agents (ascorbic acid, iron, sulfite plus iodide mediator, thiosulfate) were compared to sulfite on laboratory-chlorinated wastewater. Listed in order of decreasing relative effectiveness, we found iron metal >> sulfite plus iodide approximately = thiosulfate > sulfite >> ascorbic acid. Only the iron metal column was completely effective at rapidly removing all traces of residual chlorine.
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Bases de datos:
MEDLINE
Asunto principal:
Abastecimiento de Agua
/
Cloro
/
Purificación del Agua
/
Desinfectantes
Idioma:
En
Revista:
Chemosphere
Año:
2005
Tipo del documento:
Article
País de afiliación:
Estados Unidos