基于鸟粪石沉淀法的富磷地下水磷回收的可行性与影响因素  

Exploring the feasibility and influencing factors of phosphorus recovery from phosphorus-rich groundwater based on struvite precipitation methods

作　　者：陈惟希 杜尧 谢先军 邓娅敏 CHEN Weixi;DU Yao;XIE Xianjun;DENG Yamin(School of Environment Studies,China University of Geosciences(Wuhan),Wuhan 430078,China)

机构地区：[1]中国地质大学(武汉)环境学院,武汉430078

出　　处：《地质科技通报》2025年第1期274-284,共11页Bulletin of Geological Science and Technology

基　　金：国家重点研发计划项目(2022YFC3703700)。

摘　　要：磷供应短缺和水体磷污染已成为全球性危机。鸟粪石沉淀法是最为经济有效的磷回收方法,其磷的回收率可以达到95%以上,目前已广泛应用于污水中磷的资源化。天然富磷地下水近年来备受关注,但目前尚未有基于鸟粪石法开展富磷地下水中磷回收的报道。探讨了在富磷、富钙、富铁、富黄腐酸(FA)地下水中利用鸟粪石法在pH值为9.5的环境下回收磷的影响因素与可行性。利用X射线衍射(XRD)、扫描电镜(SEM)和傅里叶变换红外光谱(FTIR)等方法对人工合成地下水与天然地下水开展了研究。结果表明,随着钙浓度增加沉淀中鸟粪石纯度迅速下降到10%以下,XRD图谱中鸟粪石的峰消失,SEM图谱中鸟粪石表面被无定形磷酸钙覆盖,单独添加铁和黄腐酸后鸟粪石的纯度变化较小,SEM图谱显示固体表面出现絮状沉淀。影响因子共存条件下得到的鸟粪石沉淀X射线光谱显示出无规则峰值,傅里叶红外光谱图分别在波数453,720,750,1608,1679 cm^(−1)处的峰消失,表明高浓度的钙能显著抑制地下水中鸟粪石的形成,铁和黄腐酸对鸟粪石形成的影响相对较弱;研究因子的共存会加剧抑制鸟粪石的形成,3个因子共同决定了鸟粪石能否在地下水中有效沉淀。本研究识别了鸟粪石沉淀法回收地下水中磷的影响因素与机制,研究结果将有助于富磷地下水中磷回收策略的制定。[Objective]The global phosphorus(P)supply shortage and water pollution crisis necessitate an urgent shift from simply removing polluted phosphorus to leveraging it as a resource.Among recovery methods,the struvite precipitation method is recognized for its cost-effectiveness and high efficiency,achieving phosphorus recovery rate exceeding 95%.This method has been widely used in the reclamation of phosphorus in sewage.Despite extensive research on naturally P-rich groundwater in recent years,there is a lack of studies focusing on phosphorus recovery using the struvite method.[Methods]This study explores the influencing factors and feasibility of employing the struvite method to recover phosphorus from groundwater abundant in phosphorus,calcium,iron,and fulvic acid(FA)at an optimal pH of 9.5.The aim is to develop an integrated phosphorus recycling system for P-rich groundwater and offer constructive suggestions for groundwater phosphorus recycling..Advanced techniques such as X-ray diffraction(XRD),scanning electron microscopy(SEM),and Fourier transform infrared(FTIR)spectroscopy were utilized alongside the molybdenum blue method for phosphoric acid detection,the Nash reagent was used for ammonia nitrogen detection,and Origin 9.0 was used for data visualization.These techniques have been used to thoroughly study both synthetic and natural groundwater.[Results]The results show that as calcium concentration increases,the purity of struvite declines rapidly to below 10%,with the struvite peak vanishing in XRD patterns and amorphous calcium phosphate covering struvite surface in SEM patterns.When iron and/or fulvic acid were added individually,the struvite purity remained relatively unchanged.The XRD patterns revealed a weakened struvite peak,while the SEM patterns showed that flocculation precipitation occurred on the solid surface.The X-ray spectra of struvite precipitates obtained under the coexistence of influencing factors showed irregular peaks,with the peaks at 453 cm^(-1),720 cm^(-1),750 cm^(-1),1608 cm^(-1), a

关 键 词：鸟粪石 磷回收 地下水 钙离子 铁离子 

分 类 号：X523[环境科学与工程—环境工程]