Reaction dynamics and effect factors of metoprolol oxidative decomposition in municipal wastewater by sodium hypochlorite [次氯酸钠氧化分解污水中美托洛尔的反应动力学及影响因素]

作者：Zhang X.; Tan Y.; Li P.; Liu Z.; Ju S.; Liu M.; Ren Y.^*

来源：Chinese Journal of Environmental Engineering, 2018, 12(11): 3069-3078.

DOI：10.12030/j.cjee.201804196

• Humus acid
• Metoprolol
• PH
• Sodium hypochlorite
• Temperature

After taken by the patients, antihypertensive drug metoprolol can be excreted with urine into municipal wastewater treatment plants through the sewers and ultimately enters into natural water due to its low removal efficiency. As an emerging pollutant, it is persistent in the environment and can cause potential hazards. The decomposition of metoprolol with sodium hypochlorite, a chlorine disinfectant, under environmental factors such as temperature, pH and common organic compounds in wastewater was investigated. The results revealed that the elimination of metoprolol by sodium hypochlorite followed pseudo-first order kinetics. Temperature played a significant role in the reaction as the removal rate of metoprolol increased with the temperature rising between 15 and 45 degrees Celsius, which followed Van't Hoff rule. As pH increased from 3 to 8, the reaction rate decreased accordingly. In addition, the presence of 0.1~1.0 mg?L -1 humic acid or 5~20 mg?L -1 surfactant in the water environment also promoted the oxidative decomposition reaction, but the acceleration gradually stabilized as the content of these organics increased. These results provide a scientific basis for the elimination of metoprolol in wastewater treatment plants by sodium hypochlorite.

• 单位
  华南理工大学