中试鸟粪石流化床反应器回收污泥强化厌氧释磷上清液中的磷及产品分析  

P-recovery as struvite from the enhanced anaerobic phosphorus release supernatant in a pilot-scale fluidized bed reactor and characterization of the product

作　　者：孟勇彪 李志 王林[1,3] 李咏梅 MENG Yongbiao;LI Zhi;WANG Lin;LI Yongmei(State Key Laboratory of Pollution Control and Resources Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;Shanghai Municipal Engineering Design Institute(Group)Co.Ltd.,Shanghai 200092,China;Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China)

机构地区：[1]同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海200092 [2]上海市政工程设计研究总院(集团)有限公司,上海200092 [3]上海污染控制与生态安全研究院,上海200092

出　　处：《环境工程学报》2021年第4期1377-1385,共9页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2015ZX07306001)。

摘　　要：为了探究鸟粪石结晶成粒技术在实际工程中的应用效果及回收的鸟粪石产品作为缓释肥的可能性,利用大规模中试鸟粪石流化床反应器(25 m^(3)·d^(-1))处理天津市某污泥厂污泥强化厌氧释磷上清液,探究不同培养时间下鸟粪石结晶成粒情况并系统分析收获的鸟粪石颗粒品质。结果表明,在反应周期内,磷回收率达到95%,鸟粪石颗粒平均粒径随反应时间逐渐增大,由最初的0.340 mm增至0.563 mm,纯度均在90%左右,颗粒形貌呈不规则短柱状。采用visual Minteq3软件模拟、X射线衍射光谱(EDX)分析和拉曼光谱等手段进行分析发现,鸟粪石颗粒含有无定形磷酸钙(ACP,Ca3(PO4)2·x H2O)、碳酸钙(CaCO3)及少量有机物等杂质沉淀。回收的鸟粪石颗粒中Pb、As、Cr等重金属含量均低于现行国家化肥控制标准(GB/T 23349-2009)限值,Hg和Cd均未检出。因此,该中试工艺中的鸟粪石有较好的回收利用价值。经济分析结果表明,鸟粪石结晶成粒技术回收每吨污泥厌氧消化上清液中磷的成本为0.46元。In order to explore the application of struvite crystallization technology in actual engineering and the possibility of recycled struvite as a slow release fertilizer,a large pilot-scale struvite fluidized bed reactor(25 m^(3)·d^(-1))was used to recover phosphorus from the enhanced anaerobic phosphorus release supernatants derived from a sludge treatment plant in Tianjin.Struvite crystallization at different reaction times was investigated and the quality of harvested struvite pellet was systematically analyzed.The results indicate that the recovery efficiency of PO43--P was around 95%.The average crystal size of struvite increased from 0.340 mm to 0.563 mm with the increase of reaction time.The purity of struvite reached 90%and it particle morphology was irregular column.Analysis by Raman spectroscopy,energy dispersive X-ray(EDX)and software visual Minteq3 showed that some impure precipitates of calcite,amorphous calcium phosphate(ACP,Ca3(PO4)2·x H2 O)and little organic compounds occurred in struvite.The contents of heavy metals such as Pb、As、Cr were below the limits of heavy metal contents regulated by the current fertilizer control standards in China(GB/T 23349-2009).Mercury(Hg)and cadmium(Cd)were not detected.Therefore,the harvested struvite had good recovery and application value.Economic analysis indicates that the cost of struvite crystallization technology for phosphorus recovery is 0.46 yuan·t-1 anaerobic digestion supernatant.

关 键 词：鸟粪石 中试流化床反应器 污泥强化厌氧释磷上清液 颗粒品质表征 共沉淀物 

分 类 号：X703.1[环境科学与工程—环境工程]