Phosphorus Adsorption in Water and Immobilization in Sediments by Lanthanum-modified Water Treatment Sludge Hydrochar

被引：1
|
作者：
He L.-W. [1 ]
Chen Y. [2 ]
Sun F. [2 ]
Li Y.-J. [2 ]
Yang S.-S. [1 ]
Zhang Z.-P. [3 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[2] School of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu
[3] Chengdu Center of Hydrogeology and Engineering Geology, Sichuan Bureau of Geology & Mineral Resources, Chengdu
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 06期
关键词：
endogenous phosphorus; hydrothermal; immobilization; lanthanum-modified; sediment; water treatment sludge;
D O I：
10.13227/j.hjkx.202207114
中图分类号：
学科分类号：
摘要：
Using water treatment sludge and lanthanum chloride as raw materials, lanthanum-modified water treatment sludge hydrothermal carbon was prepared through one-step hydrothermal carbonization and loading lanthanum. SEM-EDS, BET, FTIR, XRD, and XPS were used to characterize the materials. The initial pH of the solution, adsorption time, adsorption isotherm, and adsorption kinetics were investigated to study the adsorption characteristics of phosphorus in water. The results showed that the specific surface area, the pore volume, and the pore size of the prepared materials were significantly increased, and the phosphorus adsorption capacity was greatly improved compared with that of the water treatment sludge. The adsorption process conformed to the pseudo-second-order kinetic model, and the Langmuir model fitted the maximum phosphorus adsorption capacity to 72.69 mg·g-1. The main adsorption mechanisms were electrostatic attraction and ligand exchange. Adding lanthanum-modified water treatment sludge hydrochar into the sediment could effectively control the release of endogenous phosphorus from the sediment to the overlying water. According to the analysis of phosphorus forms in sediment, the addition of hydrochar promoted the transformation of unstable NH4 Cl-P, BD-P and Org-P into the very stable HC1-P in the sediment, which reduced the content of potential active phosphorus and also significantly reduced the content of biologically available phosphorus. This indicated that lanthanum-modified water treatment sludge hydrochar could effectively adsorb and remove phosphorus in water and could also be used as sediment improvement material to effectively stabilize endogenous phosphorus in sediment and control phosphorus content in water. © 2023 Science Press. All rights reserved.
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页码：3288 / 3300
页数：12
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