Research On Experimental & Device Of UV/H₂O₂/O₃ Combined Process For Treament On Landfill Leachate

As an important oxidant in advanced oxidation technology,ozone has the characteristics of strong oxidizing ability and fast oxidation rate.It has been used to treat high concentration organic wastewater.Landfill leachate is a kind of wastewater containing polymer and refractory organic matter.At present,the traditional biochemical treatment has been difficult to meet the discharge standard.Ozone advanced oxidation technology + biochemical treatment as a new generation of landfill leachate treatment process,not only can reduce the processing costs,and easy to form a modular management,has been widely promoted and applied.In this paper,UV/H2O2/O3 combined process was used to study the effluent of the landfill leachate,and the optimum treatment conditions were explored.A set of photochemical reactor suitable for the system was designed according to the UV/H2O2/O3 combined process system.The analysis of organic matter in the process of advanced oxidative degradation was carried out.Through the experimental analysis,we can draw the following conclusions:(1)The optimum conditions for the deep oxidation of landfill leachate effluent by UV/H2O2/O3 were: the reaction time was 180 min,the intensity of ultraviolet light was 10 W,and the ozone was Intake flow rate of 160 L/h,30% hydrogen peroxide dosage of 50 m L /L,pH 9.Under the optimum operating conditions,the removal rates of COD,ammonia nitrogen and color were 84.22%,100% and 99.38%,respectively.The biodegradability of wastewater has been significantly improved,B/C volume has increased from the original 0.01 to 0.31.(2)The experimental design of the photochemical reactor not only solved the problem of chroma to photochemical oxidation treatment,but also through the use of tail gas reuse to further improve the utilization of ozone,the average ozone utilization from the original 80.03% has been increased to the current 87.22 %,an increase of 7.19%,saving the depth of the treatment of landfill leachate treatment costs.(3)In order to investigate the degradation process of organic matter in the process of advanced oxidation,the mechanism of degradation of organic matter was further studied.The organic matter was oxidized by GC-MS,and the decomposition process of organic matter in the oxidation process was obtained.GC-MS was used to test the organic matter after advanced oxidation,and the decomposition process of organic matter was obtained.Through the analysis it can be obtained that not only in the composition,but also in the organic species have been significantly improved after UV/H2O2/O3 combination process of organic matter.In the process of oxidation of high molecular substances by hydroxyl radical attack into small molecules can be detected;water is also significantly detect the analysis of more halogenated hydrocarbons,indicating that the liquid halide groups by the destruction of hydroxyl radicals,The formation of halogenated ions and the new alkane species re-combined into a new haloalkane material.