Potassium Persulfate as Oxidant in Pressurized Hot Water
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- 作者：Juhani Kronholm and Marja-Liisa Riekkola
- 刊名：Environmental Science & Technology
- 出版年：1999
- 出版时间：June 15, 1999
- 年：1999
- 卷：33
- 期：12
- 页码：2095 - 2099
- 全文大小：62K
- 年卷期：v.33,no.12(June 15, 1999)
- ISSN：1520-5851
文摘
Sub- and supercritical water oxidation are quite newtechniques for wastewater treatment. Temperatures mustbe high enough and reaction times long enough thatthe organic compounds are completely oxidized into carbondioxide and water. The critical temperature and pressureof water are 374 
C and 22.1 MPa. The primary aim ofthe study was to determine whether potassium persulfateis a feasible choice for oxidant in work clearly belowthe critical temperature of water. Because potassiumpersulfate is water soluble, it can be added directly to watercontaining organic compounds. Simple equipment wasconstructed for oxidation in high-temperature pressurizedwater, and oxidation of phenol, 2,3-dichlorophenol, and1-naphthol was carried out in aqueous environment at 75-340 C with potassium persulfate used as oxidant. Thepressure was adjusted to 25-45 MPa. The concentrationof the organic compounds was 1.0 mM, and that of theoxidant was 1.0-10.0 mM. Study was made of the effectsof concentration, temperature, and reaction time onoxidation efficiency. The removal percentages of phenolwere good even at 115 C. Concentration of the oxidantturned out to be a very important parameter. Alsotemperature and reaction time had an effect on theresults. There were some problems arising from theformation of rust and from blockage of the capillaries ofthe equipment. However, the blockage could be preventedwith use of a precipitant collector.
C and 22.1 MPa. The primary aim ofthe study was to determine whether potassium persulfateis a feasible choice for oxidant in work clearly belowthe critical temperature of water. Because potassiumpersulfate is water soluble, it can be added directly to watercontaining organic compounds. Simple equipment wasconstructed for oxidation in high-temperature pressurizedwater, and oxidation of phenol, 2,3-dichlorophenol, and1-naphthol was carried out in aqueous environment at 75-340 C with potassium persulfate used as oxidant. Thepressure was adjusted to 25-45 MPa. The concentrationof the organic compounds was 1.0 mM, and that of theoxidant was 1.0-10.0 mM. Study was made of the effectsof concentration, temperature, and reaction time onoxidation efficiency. The removal percentages of phenolwere good even at 115 C. Concentration of the oxidantturned out to be a very important parameter. Alsotemperature and reaction time had an effect on theresults. There were some problems arising from theformation of rust and from blockage of the capillaries ofthe equipment. However, the blockage could be preventedwith use of a precipitant collector.