同轴降膜放电反应器等离子体降解布洛芬的技术研究

发布时间：2018-05-13 20:01

本文选题：液体表面放电 + 同轴降膜　；参考：《浙江大学》2015年硕士论文

【摘要】：水体环境中的残留药物是一类微量有机污染物,由于其抗体性和生物难降解性,在生物体内不断富集,通过食物链给人类造成潜在的“三致”危害。近十几年来,它引起的环境安全问题受到了越来越多的关注。本文以一种非甾体抗炎药布洛芬(Ibuprofen, IBP)为目标污染物,通过研究在同轴降膜放电反应器中产生低温等离子体对IBP的降解过程,为含IBP废水的有效处理提供了新的思路。首先在同轴降膜放电体系中考察了包括峰值电压(Vρ)、脉冲重复频率(f)、电极半径(r)、脉冲成形电容(Cp)等的电源和反应器参数以及包括初始浓度(C0)、流速(Q)、温度(T)等的溶液参数对IBP降解效率的影响。实验结果表明在Vp=32kV、100 pps、r=1.5mm、Cp=0.9nF、C0=20 mg/L、Q=64 L/h、T=298 K时反应30 min后IBP的降解率可达到90%以上。与光电-Fenton、光-Fenton、光催化、超声等其他高级氧化技术相比,同轴降膜放电体系处理IBP的能量效率要高出几倍到几十倍不等。其次研究了不同条件下的放电过程的发射光谱的变化和IBP在降解过程中的TOC、BOD5/COD的变化规律,考察了IBP降解过程的中间产物和分析了可能的降解途径。研究结果表明放电体系中产生的活性物质浓度主要受放电功率的影响,并且与放电功率具有正相关的关系；IBP在降解过程中的TOC变化并不明显,初始浓度为60 mg/l,放电处理180 min后,TOC只下降了34%,表明主要生成一些小分子的有机中间产物；B/C值从最初的0提高到了0.577,一方面说明其可生化性得到了极大的提高,另一方面说明对微生物的毒性大大降低。最后考察了在同轴降膜放电反应器中降解IBP过程的宏观动力学,并通过气液反应理论建立了体系的传质-反应模型。结果表明IBP在同轴降膜放电反应器中的传质-反应动力学是发生在液膜内的拟快速反应,且宏观上对IBP是一级反应,本征反应级数是二级。
[Abstract]:The residual drugs in water environment are a kind of trace organic pollutants. Because of their antibody and biodegradability, they are constantly enriched in the body of living things, resulting in potential "triple-induced" harm to human beings through the food chain. In the past ten years, the environmental safety problem caused by it has been paid more and more attention. In this paper, Ibuprofen (Ibuprofen), a non-steroidal anti-inflammatory drug, was used as the target pollutant. The degradation of IBP by low temperature plasma in a coaxial falling membrane discharge reactor was studied, which provided a new idea for the effective treatment of wastewater containing IBP. The parameters of power supply and reactor, including peak voltage, pulse repetition rate, electrode radius, pulse forming capacitance, and solutions including initial concentration of C _ 0, flow rate of Q _ 0, temperature of T _ (T) were investigated in coaxial falling film discharge system. The effect of parameters on the degradation efficiency of IBP. The experimental results show that the degradation rate of IBP can reach over 90% after 30 min reaction at 20 mg / L ~ 20 mg 路L ~ (-1) C ~ (2 +) C _ (9) F ~ (2 +) C ~ (2 +) ~ (20) mg 路L ~ (-1) T ~ (2 +) T ~ (2 +) T ~ (2 +) for 30 min. Compared with other advanced oxidation technologies, such as optoelectronic Fenton, photo-Fenton, photocatalysis, ultrasonic and so on, the energy efficiency of IBP treated by coaxial falling film discharge system is several to several times higher than that of other advanced oxidation technologies. Secondly, the variation of emission spectrum in the discharge process and the variation of TOC BOD5 / COD in the degradation process of IBP were studied. The intermediate products of IBP degradation process were investigated and the possible degradation pathways were analyzed. The results show that the concentration of active substances produced in the discharge system is mainly affected by the discharge power, and there is a positive correlation between the concentration of the active substance and the discharge power. The change of TOC in the degradation process is not obvious. When the initial concentration was 60 mg / l, the TOC decreased only by 34% after the discharge treatment for 180 min, indicating that the B / C value of the organic intermediate product, which mainly produced some small molecules, was increased from the initial 0 to 0.57, which on the one hand indicated that the biodegradability was greatly improved. On the other hand, the toxicity to microorganisms is greatly reduced. Finally, the macroscopic kinetics of IBP degradation in a coaxial falling film discharge reactor was investigated, and the mass-transfer reaction model of the system was established based on the gas-liquid reaction theory. The results show that the mass-reaction kinetics of IBP in the coaxial down-membrane discharge reactor is a pseudo-rapid reaction in the liquid membrane, and the macroscopic reaction to IBP is a first-order reaction, and the intrinsic reaction order is second-order.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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