Quintana Miguel, Colmenarejo Manuel Fco, Barrera Jesús, García Gema, García Elia, Bustos Angel
Consejo Superior de Investigaciones Científicas, Centro de Ciencias Medioambientales, C/Serrano, 115-duplicado, 28006 Madrid, Spain.
J Agric Food Chem. 2004 Jan 28;52(2):294-9. doi: 10.1021/jf0303870.
This paper describes a series of experiments designed to recover phosphorus and nitrogen from sewage in the form of struvite (MgNH(4)PO(4).6H(2)O), a potential fertilizer. Nitrogen and phosphate were recovered from a filtrate of digested sludge dewatered at the Arroyo del Soto Waste Water Treatment Plant (WWTP) (Madrid, Spain). A byproduct of the Spanish magnesite mining and MgO production industry was used as the magnesium source. The precipitating performance of this byproduct was compared to that of conventional chemical reagents such as pure MgO. The precipitates obtained were subjected to chemical, light microscopy, and X-ray diffraction analysis. The findings indicate the precipitate recovered using this byproduct contains several minerals with a predominance of struvite. Optimal purity ( approximately 80% struvite) was achieved using the sieved <0.04 mm grain size fraction of the byproduct at doses corresponding to a molar Mg:P ratio of 1.6.
本文描述了一系列旨在从污水中回收鸟粪石（MgNH₄PO₄·6H₂O，一种潜在肥料）形式的磷和氮的实验。氮和磷是从西班牙马德里阿罗约德尔索托污水处理厂（WWTP）脱水消化污泥的滤液中回收的。西班牙菱镁矿开采和氧化镁生产行业的一种副产品被用作镁源。将该副产品的沉淀性能与纯氧化镁等传统化学试剂的沉淀性能进行了比较。对所得沉淀物进行了化学、光学显微镜和X射线衍射分析。结果表明，使用该副产品回收的沉淀物包含几种矿物，其中鸟粪石占主导。使用副产品筛分出的粒度小于0.04毫米的颗粒部分，在对应摩尔镁磷比为1.6的剂量下，可实现最佳纯度（约80%鸟粪石）。
