Control of Endogenous Phosphorus Release at the Sediment-Water Interface by Lanthanum-Modified Fly Ash

被引:3
|
作者
Pan, Ying [1 ,2 ]
Liu, Gang [3 ]
Chai, Beibei [2 ,4 ]
Lei, Xiaohui [5 ]
He, Lixin [2 ,4 ]
Cheng, Shuailong [6 ]
Wang, Yijie [6 ]
Chen, Wenlong [6 ]
Li, Simin [1 ]
Chen, Liang [7 ]
Chen, Bin [8 ]
机构
[1] Hebei Univ Engn, Sch Energy & Environm Engn, Handan 056038, Peoples R China
[2] Hebei Univ Engn, Hebei Collaborat Innovat Ctr Regulat & Comprehens, Handan 056038, Peoples R China
[3] Xian Municipal Design Res Inst Co Ltd, Xian 710068, Peoples R China
[4] Hebei Univ Engn, Sch Water Conservancy & Hydroelect, Hebei Key Lab Intelligent Water Conservancy, Handan 056038, Peoples R China
[5] China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China
[6] Pearl River Hydraul Res Inst, Guangzhou 510611, Peoples R China
[7] China Three Gorges Corp, Wuhan 430010, Peoples R China
[8] Beijing Normal Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100875, Peoples R China
基金
中国国家自然科学基金;
关键词
sediment-water interface; endogenous phosphorus; fly ash; lanthanum modification; MODIFIED BENTONITE; PHOSPHATE; REMOVAL; ADSORPTION; CARBONATE; EFFICACY; LAKES; PH;
D O I
10.3390/coatings12060719
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study optimizes the modification and granulation of fly ash to make it more stable at the sediment-water interface. Through laboratory simulations, the modified fly ash pellets were optimally granulated to cover the sediment-water interface, and its control effect and mechanism were evaluated. The results showed that the phosphorus adsorption effect of lanthanum-modified fly ash was 34% and 40% higher compared with those of acid-modified and alkali-modified fly ash, respectively, with the phosphorus adsorption effect reaching 85%. The best dosing ratio was about 0.3 g/L. Adsorption was affected by pH and was more effective under weak alkalinity, close to the Langmuir adsorption model, which was consistent with the unimolecular layer adsorption characteristics and the presence of chemisorption and physical adsorption. The saturation adsorption amount of phosphate by lanthanum-modified fly ash was 8.89 mg/g. The optimized granulation conditions for lanthanum-modified fly ash pellets were a fly ash/montmorillonite ratio of 7:3, a roasting temperature of 900 degrees C, a roasting time of 4 h, and a particle size of 3 mm. After 20 days, the orthophosphate removal rate was more than 60% higher than that of the control group, with a total phosphorus removal rate of 43%. After covering for 60 days, active phosphorus in the surface layer of the sediment was gradually transformed into a stable phosphorus form, with calcium phosphorus accounting for 70% of the total inorganic phosphorus. The ability of the sediment to release phosphorus to the overlying water body was also significantly weakened. Meanwhile, the total phosphorus removal rate in the overlying water at the sediment-water interface reached more than 40%, and orthophosphate removal reached more than 60%, indicating an obvious phosphorus control effect. Transmission electron microscopy analysis showed that lanthanum was present at locations enriched with elemental phosphorus and was adsorbed onto the material surface. Therefore, lanthanum-modified fly ash pellets are a promising in situ phosphorus control agent with good endogenous phosphorus pollution control abilities in eutrophic water bodies.
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页数:19
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