本文選題：液體表面放電 + 同軸降膜��； 參考：《浙江大學》2015年碩士論文

【摘要】：水體環(huán)境中的殘留藥物是一類微量有機污染物,由于其抗體性和生物難降解性,在生物體內不斷富集,通過食物鏈給人類造成潛在的“三致”危害。近十幾年來,它引起的環(huán)境安全問題受到了越來越多的關注。本文以一種非甾體抗炎藥布洛芬(Ibuprofen, IBP)為目標污染物,通過研究在同軸降膜放電反應器中產生低溫等離子體對IBP的降解過程,為含IBP廢水的有效處理提供了新的思路。首先在同軸降膜放電體系中考察了包括峰值電壓(Vρ)、脈沖重復頻率(f)、電極半徑(r)、脈沖成形電容(Cp)等的電源和反應器參數(shù)以及包括初始濃度(C0)、流速(Q)、溫度(T)等的溶液參數(shù)對IBP降解效率的影響。實驗結果表明在Vp=32kV、100 pps、r=1.5mm、Cp=0.9nF、C0=20 mg/L、Q=64 L/h、T=298 K時反應30 min后IBP的降解率可達到90%以上。與光電-Fenton、光-Fenton、光催化、超聲等其他高級氧化技術相比,同軸降膜放電體系處理IBP的能量效率要高出幾倍到幾十倍不等。其次研究了不同條件下的放電過程的發(fā)射光譜的變化和IBP在降解過程中的TOC、BOD5/COD的變化規(guī)律,考察了IBP降解過程的中間產物和分析了可能的降解途徑。研究結果表明放電體系中產生的活性物質濃度主要受放電功率的影響,并且與放電功率具有正相關的關系；IBP在降解過程中的TOC變化并不明顯,初始濃度為60 mg/l,放電處理180 min后,TOC只下降了34%,表明主要生成一些小分子的有機中間產物；B/C值從最初的0提高到了0.577,一方面說明其可生化性得到了極大的提高,另一方面說明對微生物的毒性大大降低。最后考察了在同軸降膜放電反應器中降解IBP過程的宏觀動力學,并通過氣液反應理論建立了體系的傳質-反應模型。結果表明IBP在同軸降膜放電反應器中的傳質-反應動力學是發(fā)生在液膜內的擬快速反應,且宏觀上對IBP是一級反應,本征反應級數(shù)是二級。
[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.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X703

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本文編號：1884599