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Sewage sludge management for phosphorus recovery as struvite in EBPR wastewater treatment plants

机译:EBPR废水处理厂中作为鸟粪石回收磷的污水污泥管理

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The influence of separate and mixed thickening of primary and secondary sludge on struvite recovery was studied. Phosphorus precipitation in the digester was reduced from 13.7 g of phosphorus per kg of treated sludge in the separate thickening experiment to 5.9 in the mixed thickening experiment. This lessening of the uncontrolled precipitation means a reduction of the operational problems and enhances the phosphorus availability for its later crystallization. High phosphorus precipitation and recovery efficiencies were achieved in both crystallization experiments. However, mixed thickening configuration showed a lower percentage of phosphorus precipitated as struvite due to the presence of high calcium concentrations. In spite of this low percentage, the global phosphorus mass balance showed that mixed thickening experiment produces a higher phosphorus recovery as struvite per kg of treated sludge (i.e., 3.6 gP/kg sludge vs. 2.5 gP/kg sludge in separate thickening). (c) 2007 Elsevier Ltd. All rights reserved.
机译:研究了一次和二次污泥分别和混合增稠对鸟粪石回收的影响。消化池中的磷沉淀从单独增稠实验中的每公斤处理污泥中13.7克磷减少到混合增稠实验中的5.9磷。不受控制的沉淀的减少意味着减少了操作问题,并提高了磷的可利用性,以利于其随后的结晶。在两个结晶实验中均实现了高磷沉淀和回收效率。然而,由于存在高钙浓度,混合的增稠构型显示出较低的磷含量作为鸟粪石沉淀。尽管磷含量较低,但总体磷质量平衡表明,混合稠化实验产生的磷回收率为鸟粪石/千克处理过的污泥(即分别为3.6 gP / kg污泥与2.5 gP / kg污泥单独增稠)。 (c)2007 Elsevier Ltd.保留所有权利。

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