高含量金属对污泥生物炭磷形态与释放的影响  

Effect of high-content metals on the phosphorus forms and release of sludge-derived biochar

作　　者：蒋佳佳 万俊力[1,2] 方鑫 张子怡 聂小保 孙士权[1,3] JIANG Jia-jia;WAN Jun-li;FANG Xin;ZHANG Zi-yi;NIE Xiao-bao;SUN Shi-quan(School of Hydraulic and Environmental Engineering,Changsha University of Science and Technology,Changsha 410114,China;Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province,Changsha 410114,China;Engineering and Technical Center of Hunan Provincial Environmental Protection for River-Lake Dredging Pollution Control,Changsha 410114,China)

机构地区：[1]长沙理工大学水利与环境工程学院,湖南长沙410114 [2]洞庭湖水环境治理与生态修复湖南省重点实验室,湖南长沙410114 [3]湖南省环境保护河湖疏浚污染控制工程技术中心,湖南长沙410114

出　　处：《中国环境科学》2024年第9期5026-5034,共9页China Environmental Science

基　　金：国家重点研发计划项目(2022YFE0105600);湖南省自然科学基金资助项目(2020JJ4613)。

摘　　要：将市政污泥经高含量金属强化预处理后低温热解制备成不同生物炭,采用Pearson相关分析和表征分析方法探讨了高含量金属和热解温度对污泥生物炭磷形态及磷释放的影响.结果表明,污泥生物炭的磷释放量随热解温度升高而降低,内源磷于350℃大量转变为正磷酸盐(ortho-P),强化预处理和pH值更加影响磷释放和金属元素固定,Fe/Al-P与Ca-P竞争共存且Fe/Al-P略占优势,Ca-P则对无机磷(IP)形态影响显著.高含量金属抑制磷释放、促进有机磷(OP)向IP转化以及阻碍HPO_(4)^(2-)向H_(2)PO_(4)^(-)转化的能力排序均为Fe>Al>Ca,钙基和铁基/铝基污泥生物炭的优势磷分别为Ca-P和Fe/Al-P,其中Fe/Al-P被铁铝氧化物包被而更难释放,主要磷释放形态均为Ca(H_(2)PO_(4))_(2).Fe强化预处理对磷形态与释放的影响最大,Ca强化预处理利于提高生物有效磷,可为污泥生物炭的资源化利用提供新思路.Municipal sludge was enhanced pretreated with high-content metal and then pyrolyzed to form various sludge-derived biochar at low temperature.Pearson’s correlation analysis and characterization methods were employed to investigate the effects of high-content metal and pyrolysis temperature on phosphorus forms and phosphorus release from sludge-derived biochar.The results showed that the phosphorus release from sludge-derived biochar decreased with the increase of pyrolysis temperature,and a large amount of internal phosphorus was converted into ortho-P at 350℃.The enhanced pretreatment and pH had a greater effect on the phosphorus release and immobilization of metal element than pyrolysis temperature.Fe/Al-P and Ca-P competed for the coexistence of phosphorus,and Fe/Al-P was slightly dominant,while Ca-P had a significant effect on IP species.The ability of high-content metal to promote the conversion of OP to IP,inhibit phosphorus release,and hinder the conversion of HPO_(4)^(2-)to H_(2)PO_(4)^(-)was Fe>Al>Ca.The dominant phosphorus of calcium-based,and iron-and aluminum-based sludge-derived biochar were Ca-P and Fe/Al-P,respectively,of which Fe/Al-P was encapsulated by iron-aluminum oxides and was more difficult to release.Ca(H_(2)PO_(4))_(2)was the primary form of phosphorus release.Fe-enhanced pretreatment has the greatest effect on the form and release of phosphorus in sludge-derived biochar,and Ca-enhanced pretreatment is conducive to the enhancement of bioavailable phosphorus,potentially providing new ideas for the resource utilization of municipal sludge-derived biochar.

关 键 词：市政污泥 高含量金属 污泥生物炭 磷形态 磷释放 

分 类 号：X703.1[环境科学与工程—环境工程]