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expanded granular sludge bed
|Issue Date: ||2009-12-30 14:55:55 (UTC+8)|
|Abstract: ||以出流水迴流操控之膨脹顆粒污泥床(expanded granular sludge bed, EGSB)反應器處理抑制性酚基質，在體積負荷率(volumetric loading rate, VLR) 4.0~12.2 kg COD/m3-d 下，EGSB反應器中污泥顆粒平均粒徑(dp)隨著VLR 及表面流速(us = 0.5、3.0、6.0、9.0 m/h)之增加而增大(dp 變化範圍0.88~2.35 mm)。在VLR 4.0~10.6 kg COD/m3-d 下，四組EGSB 反應器COD去除率皆達97.2%以上，VLR 增加到12.2 kg COD/m3-d 時，us 為0.5、3.0 m/h 之兩組反應器仍能正常操作(污泥量= 116.8、120.3 g；COD 去除率= 99.0、99.0%)，惟us 為6.0、9.0 m/h之兩組反應器之污泥量(110.8、104.7 g)則明顯少於前者(即us 為0.5、3.0 m/h 者)，後者流失之污泥顆粒粒徑分別為1.39~4.28 mm (dp = 2.90 mm)及1.93~4.72 mm (dp = 3.12 mm)，致COD 去除率分別下降為65.3、63.3%。由質傳參數值(2 = 4.7~37.8、Bi = 2.2~17.7、=0.64~1.12)可知，EGSB 反應器污泥顆粒外部質傳阻抗對基質去除速率之影響不大，但污泥顆粒內部之質傳阻抗對基質去除速率之影響則相當大，且內部質傳阻抗隨著VLR、us 之增加而增大。EGSB 反應器流況趨於完全混合，由動力模式模擬所得EGSB 反應器酚去除率與實驗值之誤差在7%範圍內。
With effluent-recycled expanded granular sludge bed (EGSB) reactors were used to treat an inhibitory substrate phenol, when the volumetric loading rates (VLR) of the EGSB reactors were maintained at 4.0–12.2 kg COD/m3-d, the average granule size (dp; a variation range of 0.88 to 2.35 mm) increased with increasing VLR and us. At the VLRs of 4.0–10.6 kg COD/m3-d, the four EGSB reactors were found very efficient for the removal of COD (greater than 97.2%). With a further increase of VLR to 12.2 kg COD/m3-d, the two EGSB reactors with us of 0.5 and 3.0 can still be operated properly (biomass = 116.8 and 120.3 g; COD removal = 99.0 and 99.0%). However, the biomass of the two EGSB reactors with us of 6.0 and 9.0 m/h (biomass = 110.8 and 104.7 g) obviously decreased, compared with the two EGSB reactors with us of 0.5 and 3.0 m/h. The granule size measured from the wash-out biomass for the two EGSB reactors with us of 6.0 and 9.0 m/h were 1.39–4.28 mm (dp = 2.90 mm) and 1.93–4.72 mm (dp = 3.12 mm), respectively. Thus, the COD removal efficiencies of the two EGSB reactors with us of 6.0 and 9.0 m/h dropped markedly to 65.3 and 63.3%, respectively. According to mass-transfer parameter values (2 = 4.7–37.8, Bi = 2.2–17.7, = 0.64–1.12), the external mass transfer resistance of the granule in the EGSB reactor only imposed a slight effect on overall substrate removal rate. In contrast, the internal mass transfer resistance of the granule enforced a strong effect on overall substrate removal rate; the internal mass transfer resistance increased with VLR and us. By using the proposed kinetic model, the calculated phenol removal efficiencies of the EGSB reactors were only 7% deviated from the experimental results.
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