从部分水解尿液中同步回收磷资源与电能  

Simultaneous Recovery of Phosphorus and Electricity from Partially Hydrolyzed Urine

作　　者：张琪 邓迎迎 刘元[2] ZHANG Qi;DENG Ying‑ying;LIU Yuan(College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China;College of Resource and Environment,University of ChineseAcademy of Sciences,Beijing 100049,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]中国科学院重庆绿色智能技术研究院,重庆400714 [3]中国科学院大学资源与环境学院,北京100049

出　　处：《中国给水排水》2024年第7期73-78,共6页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51978641、52122007)。

摘　　要：部分水解尿液获取方便,而鸟粪石是一种优质的含磷缓释肥,具有较高的经济价值,故以部分水解尿液为研究对象,试图在镁空气燃料电池平台上实现高纯度鸟粪石回收并保留尿液中的大部分尿素。尿液水解度理论计算和磷回收实验的结果共同表明,10%的尿液水解度能够提供足够的铵盐、碱度和缓冲能力,有利于鸟粪石沉淀的生成。镁空气燃料电池经过60 min的反应后,收集到的沉淀产物中鸟粪石(包括钾型鸟粪石)占比为94.92%,此时对尿液中PO43--P的去除率可以达到95.86%,尿液中95.74%的初始尿素得以保留,并且每处理1 m3的尿液能够同时回收0.044kW·h的电能。因此,部分水解尿液可在镁空气燃料电池中实现高纯度鸟粪石沉淀和电能的同步回收。It is easy to obtain partially hydrolyzed urine,and struvite is a high‑quality phosphorus containing slow‑release fertilizer with high economic value.This paper aimed to recover high‑purity struvite precipitates from partially hydrolyzed urine and preserve most of the urea in a magnesium-air fuel cell(MAFC)platform.The results of urine hydrolyzed theoretical calculations and phosphorus recovery experiment showed that the hydrolysis degree of 10%was favor for the struvite precipitation since urine could provide sufficient ammonium salt,alkalinity and buffering capacity.After 60 min of reaction in MAFC,the proportion of struvite(including potassium struvite)in the collected precipitates was 94.92%,and the removal rate of PO43--P in the urine reached 95.86%.The initial urea with proportion of 95.74%was preserved,and the treatment of 1 m3 of urine simultaneously recovered 0.044 kW·h of electricity.Therefore,partially hydrolyzed urine can achieve simultaneous recovery of high‑purity struvite precipitation and electricity in MAFCs.

关 键 词：尿液 鸟粪石 磷回收 镁空气燃料电池 尿素 水解度 

分 类 号：TU992[建筑科学—市政工程]