Chemical pretreatment of formaldehyde wastewater by selected Advanced Oxidation Processes (AOPs)

Chemical oxidation processes: Fenton process and catalytic ozonation with Mn2+ ions were investigated for eff ectiveness of formaldehyde (FA) oxidation. Th e infl uence of operational variables — O3, H2O2, Mn2+ and Fe2+ concentrations and reaction time were investigated. Researches were carried out on aqueous solution of FA, which concentration was 500 mg/l. Fenton process was investigated at pH 3 and catalytic ozonation at pH 7, 10 and 12. Results revealed that Fenton process was much more eff ective in FA degradation than catalytic ozonation with Mn2+ as a catalyst. Th e optimal H2O2/Fe dosage for a Fenton process was 2000/1000 mg/l. COD and FA concentrations were reduced 59,6% and 79,5%. In case of catalytic ozonation with Mn2+ the eff ectiveness was much less and it was the biggest at pH 12 and Mn2+ dosage 25 mg/l where COD and FA concentration were reduced 14% and 38%. Th erefore, Fenton process can be promising technology for FA wastewater pretreatment.

[1]  F. Beltrán,et al.  Catalytic ozonation of oxalic acid in an aqueous TiO2 slurry reactor , 2002 .

[2]  A. P. Murphy,et al.  A Fenton-like reaction to neutralize formaldehyde waste solutions , 1989 .

[3]  R. Gracia,et al.  Study of the Catalytic Ozonation of Humic Substances in Water and Their Ozonation Byproducts , 1996 .

[4]  N. Danova,et al.  Advanced oxidation of solutions containing formaldehyde part 1. Combined effect of ozone and hydrogen peroxide , 2003 .

[5]  Judith Sarasa,et al.  Heterogeneous Catalytic Ozonation with Supported Titanium Dioxide in Model and Natural Waters , 2000 .

[6]  R. Gracia,et al.  Comparative Efficiency of the Systems O3/High pH And 03/catalyst for the Oxidation of Chlorobenzenes in Water , 2000 .

[7]  S. Tong,et al.  Characteristics of MnO2 catalytic ozonation of sulfosalicylic acid and propionic acid in water. , 2003, Chemosphere.

[8]  J. Do,et al.  In situ oxidative degradation of formaldehyde with hydrogen peroxide electrogenerated on the modified graphites , 1994 .

[9]  J. Do,et al.  In situ paired electrooxidative degradation of formaldehyde with electrogenerated hydrogen peroxide and hypochlorite ion , 1998 .

[10]  R. Burch,et al.  An investigation of catalytic ozonation for the oxidation of halocarbons in drinking water preparation , 1999 .

[11]  G. Moussavi,et al.  The removal of formaldehyde from concentrated synthetic wastewater using O3/MgO/H2O2 process integrated with the biological treatment. , 2009, Journal of hazardous materials.

[12]  R. Andreozzi,et al.  The use of manganese dioxide as a heterogeneous catalyst for oxalic acid ozonation in aqueous solution , 1996 .

[13]  R. Andreozzi,et al.  The ozonation of pyruvic acid in aqueous solutions catalyzed by suspended and dissolved manganese , 1998 .

[14]  I. Rashed,et al.  A method for treating wastewater containing formaldehyde. , 2002, Water research.

[15]  C. Ni,et al.  Heterogeneous catalytic ozonation of 2-chlorophenol aqueous solution with alumina as a catalyst. , 2001, Water science and technology : a journal of the International Association on Water Pollution Research.

[16]  P. Kajitvichyanukul,et al.  Formaldehyde degradation in the presence of methanol by photo-Fenton process. , 2008, Journal of environmental management.

[17]  P. Kajitvichyanukul,et al.  Degradation and detoxification of formaline wastewater by advanced oxidation processes. , 2006, Journal of hazardous materials.

[18]  S. Christoskova,et al.  Catalytic degradation of CH2O and C6H5CH2OH in wastewaters. , 2002, Water research.

[19]  Jun Ma,et al.  Preliminary Investigation of Manganese-Catalyzed Ozonation for the Destruction of Atrazine , 1997 .

[20]  J. Do,et al.  In Situ Oxidative Degradation of Formaldehyde with Electrogenerated Hydrogen Peroxide , 1993 .