| The 60Coγ-ray/H2O2 method treating waste cooking oil is one of catalytic technologies. The method for treating organic waste liquids has many characteristics such as high efficiency, broad application ranges and simple operations and without complicated further processing. The method was firstly used to treat waste cooking oil. The treatment efficiency of waste cooking oil with 60Coγ-ray/H2O2 was studied in the experiment. Some indexes of waste cooking oil between the treated and untreated, such as Sterilization disinfection, removement of hazardous substances, sensory quality were compared and analyzed, and feasibility of Application and Existing problems in treating waste cooking oil by 60Coγ-ray/H2O2 were evaluated in the paper. Preparations of transparent soap and glycerin were concerned in the paper by irradiating waste cooking oil; the experiments have a guiding significance for Saponification process of waste cooking oil.Decolorization conditions and saponification conditions of waste cooking oil were studied with single factor experiment and the mathematical models were established. The experimental results were analyzed and verified by Design-Expert software. The experimental results showed that optimal discoloration conditions treating 10 mL waste cooking oil were H2O2 0.3mL, irradiation dose 4 kGy, decolorization time 25 min and decolorization temperature 60℃. The discoloration rate of waste cooking oil can reach 82% in the optimal conditions; The optimal saponification conditions were saponification temperature 65℃, NaOH concentration 25%, and pH 8.0, saponification time 1.5 h. The foam height of the transparent soap is about 40 cm and defaming time is about 118 min. These experimental data were simulated by the mathematical models, results showed that theoretical decolorization rate of 83.02% was agreed with the experimental value of 82% and theoretical foam height 42.05 cm was agreed with the experimental value for 40 cm. Thus, the model has either the important theory significance or the practical value for the decolonization and process of waste cooking oil. |
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