The Study Of The Ad Vanced Treatment Of Leachate Landfill Biochemical Tail Water By Fe-Mn/AC Catalytic Ozone-persulfate

Leachate biotreated tailwater from some NanChang landfill is studied in this paper,and the defradation index includes removal rate of COD?chromaticity and ammonia nitrogen,The persulfate dosage,ozone ventilation,reaction time and initial pH,etc.,are systematically discussed.the oxidation degradation ability of O₃/Na₂S₂O₈ system to treat wastewater is analysed under different reaction conditions.The change of organic matter in the wastewater before and after treatment is analysed by using a variety of characterization methods?3DEEM FT-IR and MC-MS?.Finally,A kind of new Fe-Mn/AC catalyst has been prepared to catalyze O₃/Na₂S₂O₈,which can deeply degrade biochemical tail water of landfill leachate.The result can study and research the best optimum reaction conditions and catalytic mechanism of this catalytic oxidation technology.And the conclusions are as follows:The effect of treating landfill leachate biochemistry tailings by O₃/Na₂S₂O₈ oxidation system was affected by the reaction conditions including sulfate dosage,ozone ventilation and reaction time.Under the conditions of Ozone ventilation=0.8g/h,Na₂S₂O₈ dosage=10g/L,pH=10,and reaction time=200min,the removal rates of COD?color,and ammonia nitrogen removal reached up to 76.3%?92%and 55.4%respectively.The·OH produced by O₃ and SO₄^-generated activately by Na₂S₂O₈ can synergistically oxidative degradation of pollutants in water samples.It suggested that a synergistic synergistic effect happened between the O₃oxidation and Na₂S₂O₈ oxidation.Analysing the change of wastewater quality before and after O₃/Na₂S₂O₈ treatment by3DEEM,FT-IR and GC-MS,the results shows that the leachate biotreated tailwater contains large amounts of humic acid-like and fulvic acid-like organics.After the coupling system processing,The fluorescence intensity of organic in wastewater matters is greatly decreased,and the fluorescence index of organic matter?f450/500?is increased,the aromaticity of soluble humic acid is weakened and the aromatic ring structure is increased.Alkenes,benzenes,amides and alcohols are effectively treated,and reactions such as ring-opening,chain-chain breaking occur are happening during oxidation process.Fe-Mn/AC catalyst was prepared by precipitation-impregnation and were characterized by XRD?SEM?XPS and FT-IR Characterization methods.Its result shows that Fe-Mn loads successfully on activated carbon andexist in form of Mn⁴⁺?Fe²⁺and Fe³⁺.The catalytic activity of Fe-Mn/AC catalyzed ozone in the treatment of wastewater shows the best catalytic activity when Fe:Mn=2:1 and 450°C,Fe-Mn/AC catalytic o-zone treatment wastewater present the best catalytic activity.Comparing O₃/Na₂S₂O₈ coupled system with Fe-Mn/AC catalytic O₃/Na₂S₂O₈ coupling system to analyze the biodegradation tail water of landfill leachate,it was found that the O₃/Na₂S₂O₈ coupled oxidation system after catalyst catalysis,the oxidative degradation ability improved significantly,the reaction rate accelerated and the organic degradation is more thorough.Finally,The Fe-Mn/AC catalyst showed a certain catalytic effect on the oxidation of O₃/Na₂S₂O₈.