Study On The Application Of Photosensitized Oxidation In Disposal Of Landfill Leachate

Landfill leachate, which is a kind of poisonous organic wastewater with high concentration, has made the environment secondary pollution that is greatly harmful to us human beings. After the photosensitizers are extracted , the results show that acridine orange is the optimum one in disposal of complicate system with landfill leachate.The main effects of photosensitized oxidation in disposal of landfill leachate with acridine orange have been studied and made quantization types in homogenous system. The test results of which show us efficiency with 30.9% of the ratio of de- COD in homogenous system after three-hour photostage under the conditions as follows: pH value of landfill leachate varies from 4.5 to 8.5, and the concentration of acridine orange turns to 12 mg/L. With the same concentration acridine orange and methylene blue mixed , the volume of acridine orange and methylene blue being in the ratio of 2 to 3 , the ratio of de-COD is better than that of the former, equaling to 31.4%.This thesis details us the study on disposal of landfill leachate with acridine orange absorbed by carbon fiber , which shows that it not only raises the ratio of de-COD with 63.5% in loading photosensitized oxidation system, but also resolves the loss of photosensitizers in homogenous system. Meanwhile, when the concentration of acridine orange is 12 mg/L, the optimum parameters on carbon fiber are obtained as follows: theabsorption volume is 1.5L/m2 the disposal volume of landfill leachate varies from 5.6 L/m2 to 7.5L/m2 and the organic loading is 554.9 g (COD)/m2.During the experiments, we also studied the principles of photosensitize on disposal of landfill leachate with acridine orange, which may be the coexistence between couple-combination of radicals and oxidation in the photosensitized oxidation process.