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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/30875


    Title: 氧化渠系統處理工業區廢水之反應動力及水足跡
    其他題名: Biokinetics of Oxidation Channel System Treating Industrial Park Wastewater with Water Footprints
    Authors: 許鎧伊
    HSU, KAI-YI
    指導教授: 周信賢
    CHOU, HSIN-HSIEN
    Keywords: 氧化渠;工業廢水;水足跡;基質降解動力;動力模式;模式驗證
    oxidation channel;industrial wastewater;substrate degradation kinetics;kinetic model;model validation by experiments;water footprint
    Date: 2019
    Issue Date: 2020-03-24 12:01:53 (UTC+8)
    Abstract: 本研究對象為南部某工業區污水處理廠,蒐集過去一年該廠之操作數據並瞭解現場處理之現況,依據質量平衡關係建立工業區污水處理廠氧化渠系統廢水之基質降解動力模式,並於氧化渠中採樣進行基質降解批次實驗,探求氧化渠之生物動力常數,最後以該氧化渠的操作數據驗證動力模式的適用性。此外,亦依據water footprint assessment manual進行污水處理廠之水足跡盤查,消耗之原物料(藥品、機具、電量、雜項用途等)則以process LCA為依據,不包括污泥處理(濃縮、消化及脫水之處理設施)。 該污水處理廠之廢水進流量介於1,762 ~ 3,461 m3/d,平均為2,444 m3/d,COD進流濃度215 ~ 365 mg/L,平均290 mg/L,SS進流濃度64 ~ 123 mg/L,平均93.5 mg/L;經過氧化渠系統處理後處理後之出流水COD濃度介於56 ~ 101 mg/L,平均為83 mg/L,SS濃度介於15 ~ 72 mg/L,平均為28 mg/L; COD去除率為75.5% ~ 90.0%。 本研究所求得之工業區廢水好氧降解動力常數,依溫度分為夏季與冬季,在夏季(6~9月為代表,水溫為29°C ~ 35°C),所求得之k值介於0.9 ~ 1.2 mg COD/mg VSS-d,平均為1.12 mg COD/mg VSS-d,Ks值介於20 ~ 35 mg COD/L之間,平均值為27.75 mg COD/L,冬季 (11~ 12月為代表,水溫為26°C ~ 27°C),所求得之k值介於0.88 ~ 1.0 mg COD/mg VSS-d,平均為0.94 mg COD/mg VSS-d,略低於夏季所求之k值,Ks值介於22.2 ~ 41.7 mg COD/L之間,平均值為31.95 mg COD/L,略高於夏季所求之Ks。本研究建立之活性污泥系統反應動力模式,模擬所得COD去除率與實廠操作值之誤差為 +1.1% ~+5.2%。 依據106年度進流廢水量總為845,400 m3,BOD進流平均濃度為84 mg/L,BOD放流平均濃度為3.3 mg/L,承受水體之許可濃度為4 mg/L,以及消耗原物料計算之水足跡,所得之結果如下:水足跡總量為852.71 L/m3 廢水處理量,藍水足跡為 1.21 L/m3 廢水處理量,灰水足跡為851.5 L/m3 廢水處理量,灰水足跡量為總水足跡量之96.9%。
    A full-scale oxidation channel system treating industrial park wastewater in southern Taiwan was chosen in the present study. In order to evaluate the performance of the full-scale oxidation channel system, not only a previous year operating data (inflow rate, inflow and outflow water quality, and biomass concentration in aeration tanks) were collected but sampling and analyzing works were also carried out by us. A substrate degradation kinetic model that can be used for simulating variations in substrate (COD) residual concentrations in the Oxidation Channel system was also formulated. The essential biokinetic parameters (k and Ks) for model simulation were determined by using a batch reactor method together with suspended biomass removed from the full-scale activated sludge system. Finally, the substrate degradation kinetic model was validated by experiments (i.e., the performance data of the full-scale activated sludge system). The inflow rates of the full-scale oxidation channel system were 1,762–3,461 m3/d (avg. 2,444 m3/d) with inflow COD and SS concentrations of 215–365 mg/L (290 mg/L) and 64–123 mg/L (avg. 93.5 mg/L), respectively. After Oxidation Channel, the COD and SS concentrations declined to 56–101 mg/L (avg. 83 mg/L) and 15–72 mg/L (avg. 28 mg/L), The COD removal rate is 75.5% ~ 90.0%. By using the batch reactor method, the Monod kinetic parameters k and Ks determined in the summertime (June to September 29 ℃–35℃) were 0.9–1.2 mg COD/mg VSS-d (avg. 1.12 mg COD/mg VSS-d) and 20 –35 mg COD/L (avg. 27.75 mg COD/L), respectively; whereas, the Monod kineti cparameters k and Ks determined in the wintertime (November to December 26 ℃–27 ℃) were 0.88–1.0 mg COD/mg VSS-d (avg. 0.94 mg COD/mg VSS-d) and 22.2–41.7 mg COD/L (avg. 31.95 mg COD/L), respectively. The k evaluated in the summertime was higher than that in the wintertime, whereas the Ks determined in the summertime was lower than that in the wintertime. Finally, the simulated COD removal efficiencies were +1.1% ~ +5.2% deviated from the experimental results. Water footprints (WFs) of the chosen industrial park wastewater treatment plant (excluding thickening, digestion and dewatering of sludge treatment units) were estimated using water footprint assessment manual. The calculation of all the consumed materials was based on process life cycle assessment. Based on the calculation of total inflow in year 2017 (845,400 m3), average inflow BOD concentration (84 mg/L), average outflow BOD concentration (3.3 mg/L), allowable BOD concentration of receiving water body, together with all the consumption of chemicals, mechanic devices, electricity and miscellaneous items, the obtained total quantity of WFs is 852.71 L/m3 wastewater (3.109% blue, 96.891% grey). Water footprints (WFs) of the chosen industrial park wastewater treatment plant (excluding thickening, digestion and dewatering of sludge treatment units) were estimated using water footprint assessment manual. The calculation of all the consumed materials was based on process life cycle assessment. Based on the calculation of total inflow in year 2017 (845,400 m3), average inflow BOD concentration (84 mg/L), average outflow BOD concentration (3.3 mg/L), allowable BOD concentration of receiving water body, together with all the consumption of chemicals, mechanic devices, electricity and miscellaneous items, the obtained total quantity of WFs is 852.71 L/m3 wastewater (3.109% blue, 96.891% grey).
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