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Field-Scale Study of Activated Carbon Replacement and Oxidant Dosage for Organic Matter Removal in a Water Reuse Treatment Plant

  • 임소영 (아주대학교 공학대학원)

초록/요약

Water reclamation is increasingly being pursued as a sustainable strategy for mitigating water scarcity. This study investigated the effects of activated carbon replacement and the optimization of hydrogen peroxide (H2O2) and ozone (O3) dosages on the removal efficiency of organic matter in an advanced water treatment process for water reuse. The water reclamation plant system (Q = 1,280 m3/h) entailed coagulation, dissolved air flotation, a peroxone (O3 + H2O2) process, and granular activated carbon (GAC) filtration. The influent chemical oxygen demand (COD) and total organic carbon (TOC) concentrations averaged 12.9 and 11.7 mg/L, respectively. The results indicated that GAC replacement significantly improved the removal efficiencies, with COD removal increasing from 40.8% to 64.4% and TOC removal from 32.8% to 65.9%. The optimal H₂O₂ dosage in the peroxone process was determined to be 6.25 kg/h. Excess H₂O₂ led to reduced efficiency due to the radical scavenging effect. Additionally, increasing the O3 concentration from 12 to 24 mg/L further enhanced organic matter removal, resulting in COD and TOC removal efficiencies of 60.7% and 53.7%, respectively. These findings highlighted the importance of regular activated carbon replacement and careful optimization of oxidant dosages to maintain effective treatment performances and offer practical insights into operational strategies for sustainable water reuse.

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목차

1. Introduction １
2. Materials and Methods ５
2.1. Water reuse plant specifics ５
2.2. Experimental operation conditions ８
2.3. Analytical methods １０
3. Results and discussion １４
3.1. Effect of GAC replacement １４
3.2. Effect of hydrogen peroxide dosage ２０
3.3. Effect of hydrogen peroxide and ozone dosages on treatment ２４
3.4. Analysis of byproducts ２８
3.5. Study limitations ３０
4. Conclusion ３１
References ３３
국문 초록 ４１

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