Determination of toxicity and biodegradability during UV-C/H2O2 and UV-C/S2O82- degradation of priority pollutants

Prisutnost organskih onečišćujućih tvari u vodenom okolišu, koje se obično nalaze u koncentracijama u tragovima, između ng/L i μg/L, u posljednjih je nekoliko desetljeća postao sve naglašeniji problem. Razlog tome je teško uklanjanje takvih tvari konvencionalnim postupcima obrade vode. Zbog toga raste primjena naprednih oksidacijskih procesa, AOP-a (engl. Advanced Oxidation Processes, AOP). Takvi procesi su UV-C/H2O2 i UV-C/S2O82− procesi, u kojima se koriste jaki oksidansi i UV-C zračenje, što rezultira brzom i djelotvornom razgradnjom organskih onečišćivala. Cilj ovog rada je odrediti toksičnost, korištenjem luminiscentne bakterije Vibrio fisheri i biorazgradivost, izraženu kao omjer BPK5/KPK, za četiri pesticida (alaklor, diuron, izoproturon, klorfenvinfos) i šest farmaceutika (azitromicin, deksametazon, diklofenak, eritromicin, karbamazepin, oksitetraciklin) pri njihovim optimalnim uvjetima razgradnje UV/H2O2 i UV/S2O82− procesima. Također, potrebno je odrediti toksičnost i biorazgradivost čistih pesticida i farmaceutika kako bi se utvrdilo da li se toksičnost i biorazgradivost spojeva i njihovih metabolita tijekom fotooksidacijske razgradnje, smanjila odnosno povećala.The presence of organic pollutants in the aquatic environment, commonly found in trace concentrations, between ng/L and μg/L, has become more pronounced problem in recent decades. The reason behind this is the difficulty of removal of such substances by conventional water treatment processes. That is the reason the application of Advanced Oxidation Processes (AOPs) is growing. Such processes include UV-C/H2O2 and UV-C/S2O82− processes, which use strong oxidants and UV-C radiation, resulting in the rapid and efficient decomposition of organic pollutants. The aim of this paper is to determine the toxicity, using the luminiscent bacterium Vibrio fisheri and biodegradability, expressed as BPK5/KPK, for four pesticides (alachlor, diuron, isoproturon, chlorfenvinfos) and six pharmaceuticals (azithromycin, dexamethasone, diclofenac, erythromycin, carbamazepine, oxytetracycline) within their optimal degradation conditions, using UV-C/H2O2 and UV-C/S2O82− processes. It is also necessary to determine the toxicity and biodegradability of pure pesticides and pharmaceuticals to determine whether the toxicity and biodegradability of compounds and their metabolites during photodegradation, have been reduced or increased