Naslov
Treatment of chlorophenols in water matrix by UV/ferri-oxalate system: Part II. Degradation mechanisms and ecological parameters evaluation

Autori
Kušić, Hrvoje ; Koprivanac, Natalija ; Lončarić Božić, Ana

Izvornik
Desalination (0011-9164) 280 (2011), 1/3; 208-216

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
wastewater; para-chlorophenol; UV irradiation; ferrioxalate complexes; biodegradability; toxicity

Sažetak
The aim of the study was to evaluate mechanisms involved in degradation of p-CP in water matrix by UV/ferrioxalate (UV/Fe(OX)) system regarding the type of applied UV irradiation source (UV-C and UV-A). Besides the monitoring of parent pollutant degradation and the formation of its typical degradation by-products, the process effectiveness was evaluated on the basis of mineralization extent and changes in biodegradability and toxicity of p-CP model wastewater during the applied treatments. In Part I of the study, the optimal conditions for applied UV-C/Fe(OX) and UV-A/Fe(OX) were determined and used in this comparative study. Biodegradability is estimated over BOD5/COD ratio. The toxic effects were investigated on vibrio fischeri determining EC50 value. It was found out that p-CP degradation by UV-C/Fe(OX) process occurred via synergy of direct photolysis and radical mechanism, while radicals formed through photo-induced degradation of ferrioxalates played dominant role when UV-A/Fe(OX) process was applied. The presence of ferrioxalates strongly influenced the mineralization yield and improved biodegradability in the cases when UV-A and UV-C irradiation sources were applied, respectively. However, all applied processes yielded higher toxicity of treated water within observed treatment period presumably due to the presence of p-CP degradation by-products, which are more toxic than parent pollutant.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA