Experimental and numerical investigations of phosphorus release under carbonate and variable flow in soil with Mg-Al layered double hydroxides

doi:10.1016/j.cej.2020.126735

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	Experimental and numerical investigations of phosphorus release under carbonate and variable flow in soil with Mg-Al layered double hydroxides
	Jiang, Xiaoqian 5,6; Zhou, Dan 7; Yan, Binggang 2; Li, Wenyan 3; Guan, Yuntao 1,4,6
	2021-02-15
关键词	Aluminum alloys Binary alloys Biochemistry Carbonation Ion exchange Magnesium alloys Magnesium compounds SoilsAdsorption/desorption Break through curve Mg-Al layered double hydroxide Numerical investigations Phosphate concentration Phosphorus release Simulated results Soil-column experiment
卷号	406
DOI	10.1016/j.cej.2020.126735
英文摘要	Mg-Al layered double hydroxides (LDHs) were applied to soils for controlling phosphorus (P) loss. The subsequent slow-release of immobilized P in LDHs-soil system is crucial for its bioavailability for crops. Saturated LDHs-soil column experiments were conducted to investigate the influence of carbonate and flow interruption (FI) on the release and retention of phosphate in LDHs-soil system and the results were compared to those obtained under bicarbonate or continuous flow condition. Phosphate concentrations of breakthrough curves (BTCs) and retention profiles (RPs) were analyzed by ICP-OES. Experimental results were simulated by the numerical code HP1 (Hydrus 1D + Phreeqc). The results showed that the presence of carbonate increased the ionic exchange and release of phosphate from LDHs but the release of phosphate from LDHs was not evident under the presence of bicarbonate in the LDHs-soil system. The BTCs of phosphate showed a dramatic drop after FI compared to continuous flow while the subsequent ionic exchange of phosphate with carbonate was not affected by FI. The simulated results showed that the retention of phosphate in LDHs-soil system contained irreversible retention, reversible retention, and ion-exchangeable retention. The irreversible retention increased and adsorption/desorption processes continued during FI while the ion-exchangeable P retention was not affected by FI. © 2020 Elsevier B.V.
会议录	Chemical Engineering Journal
会议录出版者	Elsevier B.V.
语种	英语
ISSN号	13858947
WOS研究方向	Engineering
WOS记录号	WOS:000600988500001
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/132720]
专题	兰州理工大学
作者单位	1.Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety, Tsinghua Shenzhen International Graduate School, China; 2.School of Civil Engineering, Lanzhou University of Technology, Lanzhou, China; 3.College of Natural Resources and Environment, Joint Institute for Environmental Research & Education, South China Agricultural University, Guangzhou; 510642, China; 4.State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing; 100084, China 5.School of Agriculture, Sun Yat-sen University, Guangzhou; Guangdong; 510275, China; 6.Tsinghua Shenzhen International Graduate School, China; 7.College of Ecology and Environment, Chengdu University of Technology, Chengdu; 610059, China;
推荐引用方式 GB/T 7714	Jiang, Xiaoqian,Zhou, Dan,Yan, Binggang,et al. Experimental and numerical investigations of phosphorus release under carbonate and variable flow in soil with Mg-Al layered double hydroxides[C]. 见:.