| Summary: | 碩士 === 東海大學 === 環境科學與工程學系 === 105 === The objective of this study is to test the feasibility of the adsorption - desorption - biodegradation (ADB) process for the removal of trace organics in water, exemplified by ibuprofen, a well-known emerging contaminants frequently found in wastewater effluents. In adsorption, activated carbon (F-400) is employed to adsorb ibuprofen. Then, ozonated water produced by the microbubble reactor was passed through the activated carbon to remove ibuprofen by oxidative desorption. Finally, the desorbed solution is fed to a bioreactor to further remove residual organic byproducts. The rationale behind the ADB concept is to effectively treat ibuprofen, to efficiently minimize ozone usage, and to improve the efficiency of subsequent biodegradation. In experiments, adsorption isotherms at pH 5, 7, and 9 have been obtained. The adsorption efficiency at pH 5 is the fastest, and the maximum adsorption occurs at pH 7. Also, desorption efficiencies at these respective pHs have also been tested. It was found that at pH 7, a desorption efficiency of over 85 % can be achieved. In addition, the rate of biodegradation is significantly enhanced as a result of ozonation treatment. A TOC removal rate of about 2.8 mg/L/day can be achieved and a mineralization of 72 % was attained. From our results, it seems promising that this easy ADB process can be used in future water reclamation processes.
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