Effect of high-content metals on the phosphorus forms and release of sludge-derived biochar
JIANG Jia-jia1, WAN Jun-li1,2, FANG Xin1, ZHANG Zi-yi1, NIE Xiao-bao1,2, SUN Shi-quan1,3
1. School of Hydraulic and Environmental Engineering, Changsha University of Science and Technology, Changsha 410114, China; 2. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China; 3. Engineering and Technical Center of Hunan Provincial Environmental Protection for River-Lake Dredging Pollution Control, Changsha 410114, China
Abstract：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 HPO42- to H2PO4- 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(H2PO4)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.
蒋佳佳, 万俊力, 方鑫, 张子怡, 聂小保, 孙士权. 高含量金属对污泥生物炭磷形态与释放的影响[J]. 中国环境科学, 2024, 44(9): 5026-5034.
JIANG Jia-jia, WAN Jun-li, FANG Xin, ZHANG Zi-yi, NIE Xiao-bao, SUN Shi-quan. Effect of high-content metals on the phosphorus forms and release of sludge-derived biochar. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(9): 5026-5034.
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