Study on oxidation characteristics of ozone to dissolved organic matter in secondary effluent
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Abstract:
The use of ozone for advanced treatment of secondary effluent is of great significance for alleviating river pollution problems in the northern region.In order to investigate the oxidation characteristics of ozone to dissolved organic matter in the secondary effluent,different concentrations of ozone were continuously used in water samples taken from the secondary effluent of the Shahe Wastewater Treatment Plant in Beijing,and dissolved in each water sample within 60 minutes.The change of dissolved organic carbon (DOC),ultraviolet absorption spectrum,fluorescence spectrum and molecular weight distribution of water samples along with time were detected after ozone treatment.The experiment results showed that the removal efficiency of DOC increased with the increase of ozone dosage and ozone treatment time.The maximum removal efficiency was achieved up to 70% when the concentration of ozone was 1.31 mg / L and the reaction time was up to 60 minutes.After reaction of ozone for 5 minutes,the fluorescence of organic matter in the water was almost eliminated,while the UV absorbance value was partially reduced.The organic matter with the molecular weights of 5-6 kDa,1-3 kDa,and 400 Da was significantly reduced and partially converted into the organic matter with the molecular weight of 60 Da.The results indicated that after ozone oxidation treatment,the quantity of organic matter in the secondary effluent significantly reduced and the organic matter with large molecular weight in the secondary effluent almost completely degraded.
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