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Effect of coagulant on acidogenic fermentation of sludge from enhanced primary sedimentation for resource recovery: Comparison between FeCl3 and PACl
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2017-05-25 06:48:16
Lin Lin, Ruo-hong Li, Zi-yuan Yang, Xiao-yan Li
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2017-05-25 06:48:16
Lin Lin, Ruo-hong Li, Zi-yuan Yang, Xiao-yan Li
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FeCl3 and PACl as coagulants in chemically enhanced primary sedimentation (CEPS) were compared in terms of their efficiencies in removing pollutants from wastewater and their effects on the acidogenic fermentation of CEPS sludge for resource recovery. PACl was found to be more effective than FeCl3 for removing suspended solids by CEPS, with around 20% higher removal efficiency. However, the coagulated Al-sludge experienced more difficulty and had lower efficiency than Fe-sludge in organic hydrolysis and acidogenesis. The batch fermentation results showed that FeCl3 dosed at 10–30mg Fe/Lsewage had little influence on sludge hydrolysis and volatile fatty acid (VFA) production, whereas an obvious inhibitory effect was observed for PACl in organic hydrolysis of the sludge. The specific hydrolysis rate constant (Kh,P ) for sludge fermentation decreased from 0.0321 for the sludge without PACl to 0.017 for the Al-sludge obtained at a dosage of 24mgAl/Lsewage. Compared to the Al-sludge, the Fe-sludge had a much higher VFA yield and significant PO4–P release during the sludge fermentation, which is attributed to the reduction of Fe(III) to Fe(II) under anaerobic conditions and the resulting disintegration of sludge flocs. By simple pH adjustment of the fermented Fe-sludge supernatant, up to 31% of the phosphorus in wastewater can be recovered in the form of vivianite as P fertilizers. VFAs produced in the supernatant are valuable organic carbon resources that can be recovered for beneficial uses.
中文翻译:
混凝剂对强化初沉沉积污泥产酸发酵的影响,以回收资源:FeCl3和PACl的比较
比较了FeCl 3和PACl作为化学增强初沉(CEPS)中的凝结剂,从废水中去除污染物的效率及其对CEPS污泥产酸发酵以回收资源的影响。发现通过CEPS去除PACl比FeCl 3更有效,去除效率高出约20%。然而,凝结的铝污泥在有机水解和产酸方面比铁污泥困难更大,效率也较低。分批发酵结果表明,FeCl 3的加入量为10–30mg Fe / L污水对污泥的水解和挥发性脂肪酸(VFA)的生产几乎没有影响,而在污泥的有机水解中观察到了对PACl的明显抑制作用。污泥发酵的比水解速率常数(K h,P)从不加PACl的污泥的0.0321降低到以24mgAl / L的污水量获得的Al污泥的0.017 。与铝污泥相比,铁污泥具有更高的VFA收率和显着的PO 4污泥发酵过程中的-P释放,这归因于厌氧条件下Fe(III)还原为Fe(II)以及污泥絮凝物的分解。通过简单地调节发酵后的铁污泥上清液的pH值,废水中高达31%的磷可以以堇青石的形式作为P肥料被回收。上清液中产生的VFA是有价值的有机碳资源,可以回收用于有益用途。
更新日期:2017-05-25
中文翻译:
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混凝剂对强化初沉沉积污泥产酸发酵的影响,以回收资源:FeCl3和PACl的比较
比较了FeCl 3和PACl作为化学增强初沉(CEPS)中的凝结剂,从废水中去除污染物的效率及其对CEPS污泥产酸发酵以回收资源的影响。发现通过CEPS去除PACl比FeCl 3更有效,去除效率高出约20%。然而,凝结的铝污泥在有机水解和产酸方面比铁污泥困难更大,效率也较低。分批发酵结果表明,FeCl 3的加入量为10–30mg Fe / L污水对污泥的水解和挥发性脂肪酸(VFA)的生产几乎没有影响,而在污泥的有机水解中观察到了对PACl的明显抑制作用。污泥发酵的比水解速率常数(K h,P)从不加PACl的污泥的0.0321降低到以24mgAl / L的污水量获得的Al污泥的0.017 。与铝污泥相比,铁污泥具有更高的VFA收率和显着的PO 4污泥发酵过程中的-P释放,这归因于厌氧条件下Fe(III)还原为Fe(II)以及污泥絮凝物的分解。通过简单地调节发酵后的铁污泥上清液的pH值,废水中高达31%的磷可以以堇青石的形式作为P肥料被回收。上清液中产生的VFA是有价值的有机碳资源,可以回收用于有益用途。