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Received November 28, 1997,Revised September 03, 1997, Accepted , Available online

Volume 10,1998,Pages 176-180

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Based on wet air oxidation (WAO) and Fenton reagent, this paper raises a new low pressure wet catalytic oxidation(LPWCO) which requires low pressure for the treatment of highly concentrated and refractory organic wastewater. Compared with general wet air oxidation, the pressure of the treatment(0.1-0.6MPa) is only one of tens to percentage of latter(3.5-10MPa). In addition, its temperature is no more than 180℃.Compared with Fenton reagent, while H2O2/COD(weight ratio) less than 1.2, the removal of COD in the treatment is over twenty percents more than Fenton's even the value of COD is more than 14000mg/L. In this paper, we study the effect factor of COD removal and the mechanism of this treatment. The existence of synergistic effect (catalytic oxidation and carbonization) for COD removal in H2SO4-Fenton reagent system under the condition of applied pressure and heating (0.1-0.6MPa, 104-165℃) was verified. The best condition of this disposal are as follows: H2O2/COD(weight ratio)=0.2-1.0, Fe2+ 0.6×10-3 mol, H2SO4 0.5mol, COD>1×104mg/L, the operating pressure is 0.1-0.6MPa and temperature is 104-165℃. This method suit to dispose the high-concentrated refractory wastewater, especially to the wastewater containing H2SO4 produced in the manufacture of pesticide, dyestuff and petrochemical works.

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