Study on Removal Effect of Different Organic Fractions from Bio-treated Effluent of Dye Wastewater by UV/H2 O2 Process
UV/H2O2法对印染废水生化出水中不同种类有机物的去除效果

The pretreatment of bio-treated effluent of dye wastewater by UV/H2O2 process was studied.The influencing factors,such as H2O2 dosage,reaction time and pH values were evaluated for the removal efficiency of UV254,ADMI7.6,DOC and DOC of dye wastewater by UV/H2O2 process.The experimental results showed that,the optimal conditions determined were as follows: initial pH 7.4-8.1,H2O2 dosage 4.5 mmol·L-1 and UV irradiation time of 50 min.Under the optimal conditions,UV254,ADMI7.6,DOC and COD removal rate could reach 77%,94%、 40% and 69%.Removal effects of four different DOM fractions,hydrophobic acids,non-acid hydrophobics,tasnsphilics and hydrophilics separated by XAD-8 and XAD-4 resins.The experimental results show that:hydrophobic material was the main substance causing color,when it was characterized by ADMI7.6,the proportion could reach 92%,of which 53% was non-acid hydrophobics.It indicated that removal efficiencies of tasnsphilics,hydrophobic acids and non-acid hydrophobics were high through UV/H2O2 process,while hydrophilics’ efficiencies were lower.The experimental results showed that organic molecules with molecular weight over 10 000 contributed greatly to UV254,ADMI7.6 and DOC removal rate.