Niewersch C, Koh C N, Wintgens T, Melin T, Schaum C, Cornel P
Department of Chemical Engineering, RWTH-Aachen University, Turmstrasse 46, 52056 Aachen, Germany.
Water Sci Technol. 2008;57(5):707-14. doi: 10.2166/wst.2008.119.
Due to the depletion of mineral phosphorus resources there is an increasing demand for efficient phosphorus recovery technologies. In this study the potential of nanofiltration to recover phosphorus from pre-treated sewage sludge is investigated. The efficiency of three commercial nanofiltration membranes (Desal 5DK, NP030; MPF34) was tested using model solutions. Desal 5DK showed the best selectivity for phosphorus. A pH of lower than 1.5 was found to be most suitable. Desal 5DK was used on four different sewage sludge ash eluates and on one sewage sludge. In these experiments it was shown that a separation of phosphorus from undesired components such as heavy metals was possible with significant variations in the efficiency for the different ash and sludge types. Additionally the achievable product recovery was investigated with model solutions. A product recovery of 57.1% was attained for pH 1 and 41.4% for pH 1.5.
由于矿物磷资源的枯竭，对高效磷回收技术的需求日益增加。在本研究中，对纳滤从预处理污泥中回收磷的潜力进行了研究。使用模型溶液测试了三种商业纳滤膜（Desal 5DK、NP030；MPF34）的效率。Desal 5DK对磷表现出最佳的选择性。发现pH低于1.5最为合适。Desal 5DK用于四种不同的污水污泥灰洗脱液和一种污水污泥。在这些实验中表明，将磷与重金属等不需要的成分分离是可能的，不同灰分和污泥类型的效率有显著差异。此外，用模型溶液研究了可实现的产物回收率。pH为1时产物回收率达到57.1%，pH为1.5时为41.4%。
