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Study on Degradation of Organic Contaminants by Hydro-Plasma

Author: SunJianHua
Tutor: LiuZiLi
School: Guangxi University
Course: Chemical processes
Keywords: Electrohydraulic plasma Degradation Organic Pollutants Methyl red Nitrophenol
CLC: X703
Type: Master's thesis
Year: 2008
Downloads: 186
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Abstract

Liquid-phase high-voltage discharge plasma technology is a new water treatment advanced oxidation technology, which involves plasma physics, plasma chemistry, photochemical oxidation, electrohydraulic cavitation degradation, supercritical water oxidation, ozonation and other water treatment the combined effect of the method. High-energy electrons, the technology produced by plasma active species (such as free radicals, reactive molecules) and the role of organic pollutants in the wastewater, organic pollutant degradation reaction, and even completely mineralized. It does not produce secondary pollution is a serious paper, pharmaceutical, printing and dyeing, biological pollution of water resources better refractory organic wastewater and water treatment technology has the potential. The homemade pipe continuous reactor for wastewater organics degradation of the high-pressure discharge plasma needle - this article, the electrode spacing of the reactor, the discharge time, wastewater treatment, the discharge voltage and the aeration conditions, and other factors induced active substance H < sub> 2 O ₂ O ₃ shadow noon. Experimental results show that the electrode spacing and the discharge time of generating H ₂ O ₂ O ₃ concentration of greater impact, the discharge voltage and discharge manner has little effect. The water will produce NO ₂ ^{- , NO ₃ ^{- anions such as exposure to high pressure discharge into the air conditions the same time, the pH of the system decreases, the conductivity increases. In this paper, the circulating flow of the azo dye of methyl red wastewater in needle - tubular reactor in degradation. In the frequency of 150Hz, and the discharge voltage of 30kV, air flow rate of 300 mL · min ^{-1 , the electrode spacing 2cm of the conditions, the degradation of 300mL of methyl red wastewater recycling 120min, the degradation rate can reach 95.2%. Degradation process, the pH of the system is declining, the conductivity increases gradually. The study also found that increasing the amount of air aeration, help to improve the degradation rate of the lower initial pH value; initial conductivity increase is not conducive to degradation. By FT-IR, GC / MS analysis of the degradation process of methyl red intermediate degradation processes may be methyl red molecules of the azo double bond is destroyed by the attack of free radicals formed in the fluid power plasma conditions. Of phenolic wastewater liquid electric plasma degradation. The needle electrode spacing 2.0cm - tube continuous reactor, under exposed air conditions, degradation of p-nitrophenol wastewater 120min, nitrophenol degradation rate reached 91.2%. Nitrophenol concentration, initial pH and conductivity in wastewater nitrophenol degradation rate impact. Reducing the initial concentration of the nitrophenol can increase the degradation rate; favorable initial pH value was small degradation; initial increase in conductivity is not conducive to degradation of. In this paper, FT-IR, LC / MS technology to track the degradation process intermediates found intermediate quinone generated in the process of degradation of nitrophenol wastewater, based on the degradation of p-nitrophenol was mainly due to free radical attack, and replace the active site of the nitrophenol.}}}

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