Evaluation of performance of hybrid photolysis-DCMD and photocatalysis-DCMD systems utilizing UV-C radiation for removal of diclofenac sodium salt from water

被引:22
作者
Mozia, Sylwia [1 ]
Darowna, Dominika [1 ]
Przepiorski, Jacek [1 ]
Morawski, Antoni W. [1 ]
机构
[1] West Pomeranian Univ Technol, Inst Chem & Environm Engn, Dept Water Technol & Environm Engn, PL-70322 Szczecin, Poland
关键词
photocatalytic membrane reactor; direct contact membrane distillation; photolysis; photocatalysis; diclofenac sodium salt; MEMBRANE DISTILLATION; DRUG DICLOFENAC; DEGRADATION; TIO2; REACTOR; PURIFICATION; OZONE; DYES;
D O I
10.2478/pjct-2013-0010
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The removal of a non-steroidal anti-inflammatory drug (NSAID) diclofenac sodium salt (DCF, C14H10Cl2NNaO2) from water in two hybrid systems coupling photolysis or photocatalysis with direct contact membrane distillation (DCMD) is presented. A UV-C germicidal lamp was used as a source of irradiation. The initial concentration of DCF was in the range of 0.005-0.15 mmol/dm(3) and the TiO2 Aeroxide (R) P25 loading (hybrid photocatalysis-DCMD) ranged from 0.05 to 0.4 g/dm(3). Regardless of the applied hybrid system and the initial concentration of DCF, the model drug was completely decomposed within 4 h of irradiation or less. Mineralization was less efficient than photodecomposition. In case of the hybrid photolysis-DCMD process the efficiency of TOC degradation after 5 h of irradiation ranged from 27.3-48.7% depending on the DCF initial concentration. The addition of TiO2 allowed to improve the efficiency of TOC removal. The highest degradation rate was obtained at 0.3 gTiO(2)/dm(3). During the process conducted with the lowest DCF initial concentrations (0.005-0.025 mmol/dm(3)) a complete mineralization was obtained. However, when higher initial amounts of DCF were used (0.05-0.15 mmol/dm(3)), the efficiency of TOC degradation was in the range of 82.5-85%. The quality of distillate was high regardless of the system: DCF was not detected, TOC concentration did not exceeded 0.7 mg/dm(3) (1.9 mg/dm(3) in permeate) and conductivity was lower than 1.6 mu S/cm.
引用
收藏
页码:51 / 60
页数:10
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