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Song Y.,Environment Protect Research Institution of Light Industry | Song Y.,University of Science and Technology Beijing | Wang H.,Environment Protect Research Institution of Light Industry | Li P.,Environment Protect Research Institution of Light Industry | Hao R.,Environment Protect Research Institution of Light Industry
Chinese Journal of Environmental Engineering | Year: 2014

The oxidation viability of primary clarifier effluent of pulp and paper making wastewater with different dosage of Fenton reagent was studied in this work. The organic pollutants with molecular weight greater than 10000 were accounted for 83% in the primary clarifier effluent and their biodegradability was worse. Under the conditions of pH of 3.5, the Fe2+:H2O2 mole ratio of 1:5, the H2O2(30%) dose of lower than 3.25 mL/L, the Fenton reagent showed higher oxidation efficiency. When the dose of H2O2(30%) increased to 6.50 mL/L, over 79.5% of COD abatement, 75.3% of AOX (absorbable organic halogen) reduction, 97.5% of chroma decrease achieved and the pollutants of low molecular weight at the range of 500~3000 were accounted for 82.98% of the total in the effluent, while the ratio of BOD5/COD increased to 0.56. As a pre-oxidation process for the treatment of pulp and paper making wastewater, Fenton oxidation can decrease the molecular weight of organic matters in pulp and paper wastewater and the toxicity of wastewater, and then consequently results the increments of the wastewater biodegradability and stable operation of subsequent bio-process. Source

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