Experiment Research Of Restoration By Microwave Of Red Soil Polluted By Leachate

The ecological restoration of soil polluted by garbage leachate has attractedincreasing attention of researches in the field of solid waste. Many of them have focusedon microwave radiation as one way to remove contaminants. It is a fresh idea and of greatsignificance to study the ecological restoration of leachate-polluted soil from the aspectof microwave radiation.By radiating the polluted red soil with different radiant power and time, the thesisanalyzes the microwave’s influence on the polluted soil’s indicators, including its pHvalue, NH3-N, COD, BOD5as well as the acute biotoxicity. The experiment findings arethen analyzed from the aspect of dynamics indicator of the microwave treatment effect isalso discussed to provide a theoretical basis and technical support for the ecologicalrestoration of leachate-polluted soil. The main findings and conclusions are as follows:(1) Microwave radiation’s influence upon the pH value: Red soil polluted byleachate is alkaline. But its pH value decreased after the treatment of microwave radiation.The longer the processing time is, the closer to the neutral pH the soil will be, and the pHvalue also decreases with the increase of the radiation power.(2) Microwave radiation’s influence upon NH3-N: In the process of microwaveradiation, the removal rate of NH3-N contained in contaminated red soil is positivecorrelated with radiant time and power. No close relationship is found between theremoval rate and contamination level.(3) Microwave radiation’s influence upon COD: In the process of microwaveradiation, the removal rate of COD is positive correlated with radiant time and power. Noobvious relationship is found between the removal rate and contamination level of the redsoil. (4) Microwave radiation’s influence upon BOD: When treated by microwaveradiation, contaminated red soil saw more or less an increase in BOD5, the amount ofwhich is higher than that before microwave radiation treatment.(5) Analysis about experiment data modeling: Establish a first-order kinetic model toexplain the relationship between the radiant time and the changes of organics in thepolluted soil, and find the best microwave processing programs.