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Wang H.,Beijing Jiaotong University | Yao H.,Beijing Jiaotong University | Tian S.,HIT Environmental Technology CO. | Ma Y.-Q.,HIT Environmental Technology CO. | Yu X.-H.,Beijing Jiaotong University
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology | Year: 2013

Chlortetracycline is a kind of broad-spectrum antibiotics which is used for treating human diseases and animal diseases, and as a kind of persistent organic pollutants (POPs) remained in the aquatic environment. The degradation of CTC with the influence of Fe3+ was discussed via complexation reaction mechanism and under different conditions (ratio of n(Fe3+) to n(CTC), temperature and pH). Results show that the CTC-Fe3+ complex is likely formed with the A-ring and that a single unit of CTC can complex with a maximum of two units of Fe3+.The degradation rates are different with different concentrations of Fe3+. When the ratio of n(Fe3+) to n(CTC) reaches 1:1, the degradation rate attains the maximum value. In the presence of Fe(III) with the same concentration to CTC, the degradation rate of CTC is significantly enhanced 271% and 322% at 10°C and 20°C, respectively (however, the effect of Fe3+ was not significant at 30°C), and by 400%, 141% and 179% at pH 3, 5 and 7, respectively. Because of the abundant appearance of Fe3+, the results can provide a scientific basis for the determination of actual engineering environment condition and the modeling of CTC's degradation in pharmaceutical wastewater treatment. Source


Zhang S.,Beijing Jiaotong University | Yao H.,Beijing Jiaotong University | Wang Y.,Beijing Jiaotong University | Ma Y.,HIT Environmental Technology CO. | And 2 more authors.
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2013

Fenton oxidation is studied as an advanced treatment process of pharmaceutical wastewater, the effect of pH value, the ratio of H2O2/Fe2+, the concentration of H2O2 and the reaction time on COD removal rate, as well as the relationship among the above factors were investigated by using single factor text. The results of the test show that when the pH value was 3, e ratio of H2O2/Fe2+ was 1:1, the concentration of H2O2 was 300 mg/L and the reaction time was 60 mins, the removal rate of COD reached 59%. And then, based on the single factor test, the regression model related to the removal efficiency of COD, pH value, the ratio of H2O2/Fe2+ and the concentration of H2O2 was obtained by using Design Expert. The regression model would be a fairly reliable forecast for COD removal rate. And, it could be found that the influencing degree of different factors on oxidation performance of Fenton reagent was in the descending order of the concentration of H2O2, the ratio of H2O2/Fe2+, pH value. The optimized parameters were obtained as follows. COD removal rate was 57.415 5%, when pH was 2.98, ratio of H2O2/Fe2+ was 0.76:1, the concentration of H2O2 was 295.10 mg/L. Source

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