期刊
WATER RESEARCH
卷 44, 期 7, 页码 2371-2379出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2009.12.043
关键词
Crystallization; Phosphorus recovery; Sludge treatment; Struvite; Wastewater
资金
- Spanish Research Foundation [PPQ2002-04043-C02-02]
Phosphorus recovery by struvite (MgNH4PO4 center dot 6H(2)O) crystallization is one of the most widely recommended technologies for treating sludge digester liquors especially in wastewater treatments plants (WWTP) with enhanced biological phosphorus removal (EBPR). In this paper, phosphorus recovery by struvite crystallization is assessed using the rejected liquors resulting from four different operational strategies of the sludge treatment line. Phosphorus precipitation and recovery efficiencies of between 80-90% and 70-85%, respectively, were achieved in the four experiments. The precipitates formed were mainly struvite, followed by amorphous calcium phosphate and, in some experiments, by calcite. The highest global phosphorus recovery taking into account both the sludge line and the crystallizer was achieved when mixed thickening and high elutriation were carried out (8.4 gP/kg treated sludge). However, low struvite content was obtained in the crystallizer with this operation scheme due to the high calcium content in the elutriation stream. Therefore, if the final purpose is to obtain struvite, the reduction of the elutriation fiowrate is widely recommended in the case of high water hardness. (C) 2010 Elsevier Ltd. All rights reserved.
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