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Photo-Fenton reaction is a kind of advanced oxidation technology based on the reaction of hydroxyl radical. In order to further enhance the photocatalytic efficiency, with citric acid as the catalytic additive, and malachite green as the substrate, experiments on the photocatalytic oxidation of organic pollutants in UV/Fenton/Citric acid system were carried out. Effect of Fe(II) concentration, initial...
Considering the high ammonia nitrogen concentration of azodicarbonamide (ADC) foaming agent wastewater, the combined process route of the ultrasonic stripping pretreatment with A/DAT-IAT shortcut nitrification-denitrification technology was studied. Simulating test showed that the removal efficiency of ammonia nitrogen in the wastewater increased with the increase of pH, the reaction temperature and...
Submerged membrane bioreactor was used to investigate dyeing and finishing wastewater. Considering its unique characteristics, anaerobic process was carried out before membrane bioreactor, and powdered activated carbon was added to the reactor in order to change the property of the mixed liquor. Combination of the three processes above constituted combined process of Anaerobic-PAC-SMBR, by which the...
Adsorption of metals onto biological materials, including peat, or biosorption is well-recognised as a potential alternative to conventional wastewater treatments processes. In this work, biosorption of Cr 3+ , Cu 2+ and Cd 2+ onto peat in batch systems was investigated in the pH range 2-7. The order of maximum uptake was Cr>Cu>Cd. Both H + ion...
Biosorption of Cr 3+ , Cu 2+ and Cd 2+ from binary metal solutions onto peat in the batch systems was investigated at pH 4. The order of maximum uptake was Cr>=Cu>Cd and maximum uptake levels of ca. 0.4mmol/g were observed for chromium and copper while cadmium was taken up to a maximum of ca. 0.2mmol/g. Co-ion competition resulted in up to 70 percent decrease...
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