Abstract：
:The effluents of wastewater treatment plants, usually directly emitted to the environment, often contain the anti-inflammatory drug diclofenac (DCF). The paper investigates DCF elimination using irradiation technology. Hydroxyl radical and hydrated electron reactive intermediates resulting from water radiolysis effectively degrade DCF and strongly reduce the toxicity of the solutions. ()OH attaches to one of the rings of DCF, and hydroxylated molecules, 2,6-dichloroaniline and quinoid type compounds are the products. Hydrated electron adds to the chlorine atom containing ring, in the reaction quinoid type compounds and 4-chloroacridine form. At a 0.1 mM DCF concentration, a ∼1 kGy absorbed dose is needed for the degradation of DCF molecules, but for mineralization of the products (in presence of O2) an order of magnitude higher dose is required. For irradiation of wastewater after biological treatment a ∼1 kGy dose is suggested. At this dose DCF and other drugs or metabolites present at μg L(-1) level are eliminated together with microorganism deactivation.
journal_name
Chemospherejournal_title
Chemosphereauthors
Homlok R,Takács E,Wojnárovits Ldoi
10.1016/j.chemosphere.2011.06.101subject
Has Abstractpub_date
2011-10-01 00:00:00pages
603-8issue
4eissn
0045-6535issn
1879-1298pii
S0045-6535(11)00759-4journal_volume
85pub_type
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