Using bimetal oxides granular activated carbon process (BM-GACs/O3/H2O2) for the treatment of landfill leachate

• Main Author: 陳勝偉
• Other Authors: 范煥榮
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/18746974693204300565

碩士 === 弘光科技大學 === 環境工程研究所 === 100 === In Taiwan, most of the landfills are in the stable stage (landfill age >10 years) and the landfill leachate contain humic substances (humic acid (HA) and fulvic acid (FA) that are hard to be biodegradable. These humic substances might contribute more than 50% of organics in the leachate. As a result, the effluent of landfill leachate might excess the COD limit of 200 mg/L. Therefore, this project develops the nano bi metal oxides granular activated carbon (BM-GAC with H2O2 and O3) processes for the removal of organic matters in landfill leachate. Two types of BM-GACs were prepared (16 catalysts), including MnCe-GAC (MC1~MC8) and FeMn-GAC (FM1~FM8). Preparation conditions include (1) types of metal salts (chloride and nitrate salts) (2) temperature (200 and 300℃) and (3) pH (<2.5 and 10). Surface characteristics (SEM, BET) of the BM-GACs were examined as well. Experimental results indicated that BM-GAC/H2O2 can effectively remove HA and TOC, For example, MC1/O3/H2O2 and FM2/O3/H2O2, TOC removal are 87 and 92%, respectively. BM-GACs/O3/H2O2 process at lower pH has a higher TOC removal efficiency. Optimum ratio of H2O2/O3 is around 11/1. The treatment efficiencies for real landfill leachate are in order of BM-GAC/O3/H2O2 >GAC/O3/H2O2> O3/H2O2. For example, the TOC removal efficiencies of MC1/O3/H2O2, GAC/O3/H2O2 and O3/H2O2 are 68, 54 and 43%, respectively. MC1/O3/H2O2 process can reduce COD from 292 to 102 mg/L. In conclusions, BM-GACs processes have good potential for removal of organics from landfill leachate.