미세기포 부상분리 장치를 이용한 생활폐기물 재활용품 세척폐수의 전처리 특성 = Pre-treatment Characteristic of Washing Wastewater for Municipal Waste Recycling Using by Micronano Bubbles Flotation Process

다국어 초록 (Multilingual Abstract)

The waste water from the cleaning of the recycling product of life wastes which is highly condensed and creates the problems in biological treatment was examined for its ozone dissolving characteristics in application to the micro nano bubble-dissolved ozone floatation (MNB-DOF) system. The bio degradability and treatment characteristics of the waste water from the cleaning of the recycling product of life wastes were evaluated by the biological pre-treatment.
The waste water from the cleaning of the recycling product of life wastes used in this study was adopted from the S landfill site in B city and the MNB-DOF system which is composed of the equipment of micro nano bubble generative and the ozone creation equipment was used for experiment device. The size of this system is D 300 mm × H 500 mm, 150 L. The time for ozone to reach to the saturated concentration was 220∼ 240 minutes in the wastewater from the cleaning of the recycling product of life wastes through the ozone dissolving experiment with air flow volume of 1 L/min(3.43 gO₃/hr) and the concentration of the ozone was 0.834 ppm at this time.
The result from the evaluation on the treatment characteristics of the wastewater from the cleaning of the recycling product of life wastes by MNB-DOF system resulted in 66.1%, 55.2%, 57.1%, 1.6% and 30.4% respectively for SS, Turbidity, Color, BOD₅ and COD_Cr after operation for 240 minutes in air flow volume of 1.0 L/min. It was known that SS and the removing effect on turbidity by the fine air bubble properties of micro nano bubble was high, in addition, it was excellent in the removing effect on the color due to the ozone oxidation. The degree of biodegrading (BOD₅/COD_Cr) to know whether MNB-DOF system has potentiality for utilization as a pre-treatment for the biological treatment was evaluated. It is considered that it has a high potentiality to use as a pre-treatment for the biological treatment as the initial rate was changed from 0.34 to 0.48.

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