Espindola, Jonathan C.
Guimaraes, Jose R.
Vilar, Vitor J. P.
Total Authors: 6
 Univ Porto, Lab Separat & React Engn, Lab Catalysis & Mat LSRE LCM, Dept Chem Engn, Fac Engn, Rua Dr Roberto Frias, P-4200465 Porto - Portugal
 Univ Estadual Campinas, Sch Civil Engn Architecture & Urban Design, POB 6021, BR-13083852 Campinas - Brazil
 Portuguese Catholic Univ, Sch Biotechnol, Rua Diogo Botelho 1327, P-4169005 Porto - Portugal
 Univ Estadual Campinas, Dept Analyt Chem, Inst Chem, POB 6021, BR-13083852 Campinas - Brazil
Total Affiliations: 4
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING;
Web of Science Citations:
The main goal of this study is to evaluate the feasibility of the innovative FluHelik photoreactor for the removal of antimicrobial drugs at residual concentrations using a photochemical UVC/H2O2 process. Experiment studies were performed using either pure water (PW) or secondary effluent from municipal wastewater treatment plant (EW) fortified with gatifloxacin (GAT) (100 mu g L-1) as a model antimicrobial contaminant. Initially, the efficiency of the UVC/H2O2 process towards GAT removal as a function of UVC lamp power (4-11 W), H2O2 dose (25-200 mg L-1), flow rate (20-180 L h(-1)), flow mode (single vs multiple pass) and matrix (PW or EW) was assessed. Afterwards, the system efficiency was evaluated according to engineering features such as association of reactors in series and scale-up design. The performance of the FluHelik reactor was quantitatively measured through the use of a figure-of-merit, photochemical space-time yield (PSTY), that encompasses the three main contributing factors in UVC/H2O2 systems (i.e. throughput, energy efficiency and photochemical oxidation). In this context, FluHelik scale-up to pre-pilot scale proved to be feasible as similar PSTY values were obtained at both scales for assays performed with EW. In addition, the pre-pilot scale system was able to degrade all pharmaceutical compounds originally detectable in the EW matrix, reducing their concentrations to values below limit of detection. Finally, in order to test whether the treated solution might develop antibiotic resistance when in the environment, antimicrobial activity assays using bacterial cultures of Bacillus subtilis and Escherichia coli were investigated. The antimicrobial activity in the solutions dropped as the reaction time increased. (AU)