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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/93044

    Title: 活性污泥除氮程序(OAO Process)效能評估與設計參數探討;An Investigation on Performance and Design Parameters of the Oxic-Anoxic-Oxic process for Nitrogen Removal
    Authors: 林子荃;Lin, Tzu-Chuan
    Contributors: 環境工程研究所
    Keywords: OAO除氮程序;SBCOD;水解作用;污水廠設計參數;OAO process;SBCOD;Hydrolysis;Design parameters of sewage treatment plants
    Date: 2023-07-25
    Issue Date: 2023-10-04 16:23:31 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 隨著居住地、工業與農業之快速發展,有大量氮污染物排放至承受水體中,導致淡水生態系統優養化,嚴重地威脅到了水生生物以及人們之健康安全。且國內法規對於排放水之水質要求也越加嚴格,為了達到法規所限制之放流水標準,對污水處理廠處理程序和性能之探討為必要事項。
    在HRT為10~12小時之條件下,COD、BOD、氨氮、總氮之去除率分別可達80%、90%、90%、60%以上,整體效果均符合放流水標準。但由各階段不同之第一段-好氧槽(硝化槽)水力停留時間(HRT)結果顯示,應至少設計達6小時之HRT以達良好之硝化效率。好氧:缺氧:好氧為5:4:1之分配對於氮之去除能有較佳且穩定之能力,提供缺氧槽足夠體積以提高殘餘溶氧之衝擊承受度,能夠有效提升脫硝能力。經研究結果,建議設計參數HRT調整為10~16小時、F/M值為0.05~0.15 kg BOD/kg MLSS∙d、ASRT為15~30天,作為設計準則。
    ;With the rapid development of residential, industrial, and agricultural sectors, a considerable amount of nitrogen pollution is being released into receiving water bodies, causing eutrophication of freshwater ecosystems and posing a serious threat to aquatic organisms as well as human health and safety. Furthermore, domestic regulations regarding the water quality requirements for discharged water have become stricter. Therefore, it is vital to investigate the treatment processes and performance of wastewater treatment plants to meet the discharge standards set by regulations.
    The purpose of this research is to investigate the performance of the Oxic-Anoxic-Oxic (OAO) biological nitrogen removal process with a pilot plant at Taoyuan North District Water Resource Center. The designed flow rate of the pilot plant is 3-4 CMD. The study investigates the OAO process′s pollution removal efficiency and proposes suitable operation parameter ranges. It also looks into the utilization characteristics of sludge surface-adsorbed organic matter.
    Under a hydraulic retention time (HRT) of 10-12 hours, the removal rates of COD, BOD, ammonia nitrogen, and total nitrogen are all above 80%, 90%, 90%, and 60% respectively, meeting the discharge criteria. However, the results of various HRTs indicate that a minimum HRT of 6 hours of the first oxic tank should be designed to ensure sufficient reaction time for nitrification. The distribution of oxic:anoxic:oxic tanks at a ratio of 5:4:1 demonstrates better and more stable nitrogen removal capability, providing sufficient volume for the anoxic tank to enhance the tolerance of residual dissolved oxygen, thereby effectively improving denitrification capacity. Based on the research results, it is recommended to adjust the design parameters as follows: HRT of 10-16 hours, F/M value of 0.05-0.15 kg BOD/kg MLSS∙d, and an aerobic sludge retention time (ASRT) of 15-30 days, as design guidelines.
    The adsorption test results reveal that after the consumption of organic matter in the system, activated sludge can hydrolyze the adsorbed organic matter on its surface to obtain energy and support microbial growth. Furthermore, comparing the specific denitrification nitrate removal (SDNR) value to the system-based denitrification rate derived from mass balance, it is evident that hydrolysis of SBCOD(slowly biodegradeble COD) enables the post-denitrification configuration to possess a denitrification potential similar to the pre-denitrification configuration. This indicates the viability of using adsorbed SBCOD and organic matter storaged in activated sludge cells as carbon sources for denitrification in the OAO process.
    In this study, good pollutant removal rates were obtained under various F/M conditions, making it difficult to determine the effect of F/M on the OAO process. However, the adsorption test indicates that higher F/M values result in higher utilization efficiency of organic matter in hydrolysis process. As a result, future research should conduct to investige the effect of F/M on the efficiency of the OAO process.
    Appears in Collections:[環境工程研究所 ] 博碩士論文

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