The present invention relates to a leachate treatment method using a TCBF (Temperature Control Bioreactor & Flocculation) method, and more specifically, to ammonia nitrogen and hardly decomposable organic substances, which are rapidly lowered according to the winter temperature drop, The present invention relates to a method of treating leachate for effective treatment through maintainable denitrification / nitrification process and chemical flocculation sedimentation process using a specific flocculant. According to the present invention, the water temperature of the bioreactor is maintained at 20-35 ° C. regardless of winter and summer, and the treatment efficiency of the hardly decomposable organic substance and the ammonia nitrogen in the leachate is increased to 80% and 99%, respectively. In addition, the present invention by using ferric sulfate as a flocculant in the chemical flocculation precipitation process to maintain a specific pH can provide an economical leachate treatment method in which the organic matter and color remaining after the denitrification / nitrification process is removed more than 70%. have.
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