Phosphorus immobilization by the surface sediments under the capping with new calcium peroxide material. (20th February 2020)

• Record Type: Journal Article
• Authors: Zhou, Jing; Li, Dapeng; Zhao, Zhehao; Song, Xiaojun; Huang, Yong; Yang, JingJing
• Is Part Of: Journal of cleaner production. Volume 247(2020)
• Publication Date: 2020-02-20
• Subjects: Calcium peroxide -- Remediation -- Adsorption -- Phosphorus fractions -- Surface sediment; P phosphorus -- SRP soluble reactive phosphorus -- TP total phosphorus -- NCPM new calcium peroxide material -- Tot-P total phosphorus in sediments -- BD-P Fe-bound P -- Al–P Al-bound P -- Ca–P Ca-bound P -- Res-P residual phosphorus -- Fe iron -- Al aluminum -- Ca calcium -- Fe(Ⅱ) ferrous -- Fe(Ⅲ) ferric -- NH4+ ammonium -- qmax maximum adsorption capacity -- EPC0 equilibrium concentration of P adsorption and desorption; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2019.119135
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Capping material plays an important role in P (phosphorus) control. However, P immobilization on surface sediments due to the remediation by the capping materials has been neglected. Herein, we conducted an experiment to research the mechanism of surface sediment on P immobilization under new calcium peroxide material (NCPM) capping at different ratios of the sedimentary mobile phosphorus (Pmobile, the sum of NH4 Cl–P, BD-P and NaOH-nrP) to NCPM (1:1–1:4). The concentrations of soluble reactive P (SRP), ammonium (NH4 + ) and ferrous (Fe(Ⅱ)) in water and sedimentary P fractions were analyzed. The study also presents the results of Langmuir isotherm model for surface sediments and sedimentary P release under anaerobic conditions. The results show that the surface sediments under NCPM capping improved the SRP reduction both from overlying and pore water. This was attributed to Ca 2+ precipitation and sedimentary micro-environment change from anaerobic conditions to aerobic conditions which resulted from the NH4 + and Fe(Ⅱ) concentration reductions. This remediation increased maximum adsorption capacity ( S max ) and decreased equilibrium concentration of P adsorption and desorption ( EPC 0 ) in those surface sediments under NCPM capping, which was favourable for P adsorption and immobilization. The X-ray diffraction and energy-dispersive X-ray spectroscopy analyses results confirmed aforementioned results. The conversion of P fractions from Pmobile to inert P in the surface sediments was more obvious than control. The inert P increased from 50.15% (1:1) to 69.88% (1:4), resulting in lower P release from the surface sediments under NCPM capping, compared with the control. The results show that NCPM capping improved P removal and immobilization of the surface sediments, beneficial for controlling sedimentary P release. Graphical abstract: Image 1 Highlights: NCPM capping improved the sedimentary microenvironment in surface sediment. The P adsorption capacity of surface sediment under the capping was enhanced. The decline of P release from surface sediment was observed under NCPM capping. The transformation of Pmobile to P-inert fractions in sediment was improved.