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污水污泥增压水热过程磷转化特性研究
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Abstract:
通过氮气加压实现了水热过程温度–压力解耦，考察了水热温度、停留时间和初始水热压力对污泥模化物水热过程中磷形态转化的影响。研究表明，水热温度升高导致Fe(II)-P向Res-P转化；延长停留时间有利于三价铁还原，而Fe(II)-P占TP比例呈双向变化。因此，水热温度110℃和停留时间4 h为最佳水热工况。增加初始水热压力可以强化磷向水热炭富集，总磷(TP)浓度从32.88 mg/g (0.1 MPa)增至61.67 mg/g (1.0 MPa)，同时促进了有机物分解转化，水热产物有机酸导致水热液pH降低。有机酸等还原性物质使得水热液氧化还原电位降低，促进了三价铁还原，水热炭中Fe(II)-P浓度升高，从而有利于蓝铁矿生成，并在增压水热炭X射线衍射峰的17.88？和27.81？处观察较强的蓝铁矿特征衍射峰，说明温度–压力解耦水热有利于蓝铁矿生成，可为城市污泥磷资源回收提供参考。
Decoupling temperature-pressure hydrothermal process was achieved through nitrogen pressurization, and the effects of hydrothermal temperature, residence time, and initial pressure on phosphorus transformation were investigated during the hydrothermal treatment of sludge model compounds. Results show that high hydrothermal temperature promotes the conversion of Fe (II)-P to Res-P. Extending the residence time is beneficial for the reduction of trivalent iron, while the proportion of Fe (II)-P to TP shows a bidirectional change. Therefore, hydrothermal temperature of 110？C and a residence time of 4 h are the optimum hydrothermal conditions. Increasing the initial pressure can enhance the enrichment of phosphorus into hydrochar and its total phosphorus (TP) concentration increases from 32.88 mg/g (0.1 MPa) to 61.67 mg/g (1.0 MPa). At the same time, it promotes the decomposition of organic matter, and the generation of organic acids leads to decreased pH value of process water. The reducing substances such as organic acids decrease the redox potential of process waster promoting the reduction of trivalent iron. The concentration of Fe (II)-P in hydrochar increases, which is beneficial for the generation of vivianite. The characteristic diffraction peaks of vivianite at 17.88？ and 27.81？ in pressurized hydrochar become strong, indicating that decoupling temperature-pressure hydrothermal treatment is beneficial for the formation of vivianite. This can provide a reference for the phosphorus recovery from urban sludge.
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