介质阻挡放电等离子体降解制药企业废水污染物的研究

Research of degradation on wastewater pollutants discharged from pharmaceutical company by dielectric barrier discharge plasma

制药工业废水是当今社会的水环境污染的主要污染源。制药工业废水具有污染物种类繁多、组成成分复杂、生物毒性大等特点,严重阻碍了经济社会的可持续发展,是目前污、废水治理的重点。本文详细介绍了介质阻挡放电等离子体技术降解处理制药企业药物废水污染物的方法。研究了不同放电电压、污染情况、处理时间等因素对降解制药企业废水污染物的影响。实验结果表明,O2放电条件下,废水的化学耗氧量(COD)下降速率随放电电压的升高先增大后减小;污染状况严重的废水中COD下降速率相较于污染状况轻的废水慢;随着放电时间的增加,废水中COD下降速率会逐渐提高。根据O2放电条件下的发射光谱可知,氧气等离子体放电过程中,产生了氧离子、氧气分子离子等物质,这些离子能够与水相互作用,形成强氧化性活性粒子,这些粒子是废水污染物被降解的关键。

The wastewater from pharmaceutical industry is the main source of pollution in the water environment.The wastewater has such characteristics as the various types of pollutants,the complex compositions of aqueous and the high degree of biological-toxicity,so,it becomes the focus for aqueous treatment.And the wastewater is the serious obstacle for sustainable development of the economy and society.The dielectric barrier discharge(DBD)plasma technology is used to degrade the pharmaceutical wastewater pollutants.The decline ratio for chemical oxygen demand(COD)of wastewater is studied by controlling the discharge voltages,adjusting the pollutants concentration and controlling the treatment time.Plasma generated by O2 gas discharge is applied for these experiments.The results show that:with the discharge voltages increase,decline ratio for COD of aqueous first increases and then decreases;with the pollutants concentration increase,decline ratio for COD decreases slowly;and with the treatment time increase,the decline ratio for COD of aqueous increases.According to the emission spectrum of plasma generated by O2 gas discharge,substances such as oxygen ions and oxygen molecular ions are generated.And these ions can interaction with aqueous,forming strong oxidizing particles.These particles are the key to the degradation of contaminants.