Ozonation of Emergent Contaminants

摘要: ENGLISH SUMMARY: In this work, the ozonation of emergent contaminants represented by pharmaceuticals (Sulfamethoxazole and Bezafibrate) surfactants (Quaternary Ammonium Compounds) was studied. Results in terms target compound degradation mineralization along with biodegradability toxicity assessment formed intermediates are presented. Moreover, a previous study about suitability combination ozonation-Sequencing Batch Biofilm Reactor (SBBR), using model 4-chlorophenol, is shown. The preliminary runs aimed to assess 100 200 mg L-1 4-chlorophenol (4-CP) solutions ozonation-biological treatment (SBBR). The experimental results showed that an ozone flow rate 5.44 7.57 g h-1, 4-CP completely removed from solution 15 30 minutes ozonation, respectively. By other hand, at abatement time, on average only 26 % total organic carbon (TOC) removal achieved. (BOD5/COD) pre-ozonated increased 0 until range between 0.2-0.37. aerobic biological sequencing batch biofilm reactor (SBBR) gave more than 90 initial TOC. The Quaternary Compounds (QACs) carried out order potential processes for class compounds. To perform study, QACs 16-BAC (Benzyl-dimethyl-hexadecylammonium-chloride) 18-BAC (Benzyl-dimethyl-stearylammonium-chloride) were treated different O3 dosage. According results, TOC concentration 50 L-1, reached most 50% used conditions (ozone h-1). In observe means photo-Fenton, same QAC runs. Besides, two lamps (UV Xe). after treatment, photo-Fenton process achieved up 80% when UV lamp used. efficiency Xe lower. To carry sulfamethoxazole (SMX) SMX pH. proved be efficient method degrade sulfamethoxazole. After (corresponding dose = 0.4 L-1), complete antibiotic almost just 10 mineralization. also A enhancement (increment BOD5/COD ratio) 0.28 observed 60 min ozonation. acute followed Microtox(r) test profile slight increment first stage second kinetic constants magnitude 105 L mol-1 s-1 determined pH 5 7. Concerning Bezafibrate (BZF) BZF: 0.73 mmoles ozone), BZF achieved, starting 0.5 L-1. However, small part substrate mineralized. identification main intermediates, attempted HPLC-MS technique, indicates oxidation develops through both hydroxylation aromatic ring attack unchlorinated one. by-products demonstrates suitable technique improve reduce waters containing BZF.