Utilization of phosphorus loaded alkaline residue to immobilize lead in a shooting range soil

Yan, Yubo; Qi, Fang; Seshadri, Balaji; Xu, Yan; Hou, Jiexi; Ok, Yong Sik; Dong, Xiaoli; Li, Qiao; Sun, Xiuyun; Wang, Lianjun; Bolan, Nanthi

doi:10.1016/j.chemosphere.2016.07.068

Cited by 40 publications

(15 citation statements)

References 32 publications

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“…, and Cl ions from soils under alkaline conditions can facilitate the formation of stable compounds of Pb (Ahmad et al, 2014a;Ahmad et al, 2016a;Yan et al, 2016).…”

Section: -mentioning

confidence: 99%

Slow pyrolyzed biochars from crop residues for soil metal(loid) immobilization and microbial community abundance in contaminated agricultural soils

et al. 2017

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This study evaluated the feasibility of using biochars produced from three types of crop residues for immobilizing Pb and As and their effects on the abundance of microbial community in contaminated lowland paddy (P-soil) and upland (U-soil) agricultural soils. Biochars were produced from umbrella tree [Maesopsis eminii] wood bark [WB], cocopeat [CP], and palm kernel shell [PKS] at 500 °C by slow pyrolysis at a heating rate of 10 °C min. Soils were incubated with 5% (w w) biochars at 25 °C and 70% water holding capacity for 45 d. The biochar effects on metal immobilization were evaluated by sequential extraction of the treated soil, and the microbial community was determined by microbial fatty acid profiles and dehydrogenase activity. The addition of WB caused the largest decrease in Pb in the exchangeable fraction (P-soil: 77.7%, U-soil: 91.5%), followed by CP (P-soil: 67.1%, U-soil: 81.1%) and PKS (P-soil: 9.1%, U-soil: 20.0%) compared to that by the control. In contrast, the additions of WB and CP increased the exchangeable As in U-soil by 84.6% and 14.8%, respectively. Alkalinity and high phosphorous content of biochars might be attributed to the Pb immobilization and As mobilization, respectively. The silicon content in biochars is also an influencing factor in increasing the As mobility. However, no considerable effects of biochars on the microbial community abundance and dehydrogenase activity were found in both soils.

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“…, and Cl ions from soils under alkaline conditions can facilitate the formation of stable compounds of Pb (Ahmad et al, 2014a;Ahmad et al, 2016a;Yan et al, 2016).…”

Section: -mentioning

confidence: 99%

Slow pyrolyzed biochars from crop residues for soil metal(loid) immobilization and microbial community abundance in contaminated agricultural soils

et al. 2017

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“…SR, the solid waste of Na 2 CO 3 produced by Solvay process, contains mostly soluble matter (CaCl 2 , NaCl) and suspended matter (CaCO 3 , CaSO 4 , Ca(OH) 2 , SiO 2 , MgCO 3 , Al 2 O 3 and Fe 2 O 3 ) [26]. One kg of Na 2 CO 3 produced by Solvay process generates 0.30 to 0.60 kg (depending on the composition of the raw materials) of SR [24, [26][27][28]. China produced about 26.20 million tons of Na 2 CO 3 in 2018 [29], and more than 60% of the Na 2 CO 3 is produced by Solvay process [24].…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies were carried out to utilize SR for stabilizing heavy metal [28,30], soil improvement [21], and recovery of calcium carbonate [25,31], but the utilization of SR was limited compared to the output of SR. Some studies used SR as a raw material for cement production, which was still not widely used due to the influence of high chloride concentration in SR [27,32].…”

Section: Introductionmentioning

confidence: 99%

Effect of Soda Residue Addition and Its Chemical Composition on Physical Properties and Hydration Products of Soda Residue-Activated Slag Cementitious Materials

Yao

Zhao

2020

Materials

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Soda residue (SR), the solid waste of Na2CO3 produced by ammonia soda process, pollutes water and soil, increasing environmental pressure. SR has high alkalinity, and its main components are Ca(OH)2, NaCl, CaCl2, CaSO4, and CaCO3, which accords with the requirements of being an alkali activator. The aim of this research is to investigate the best proportion of SR addition and the contribution of individual chemical components in SR to SR- activated ground granulated blast furnace slag (GGBS) cementitious materials. In this paper, GGBS pastes activated by SR, Ca(OH)2, Ca(OH)2 + NaCl, Ca(OH)2 + CaCl2, Ca(OH)2 + CaSO4, and Ca(OH)2 + CaCO3 were studied regarding setting time, compressive strength (1 d, 3 d, 7 d, 14 d, 28 d), hydration products, and microstructure. The results demonstrate that SR (24%)-activated GGBS pastes possess acceptable setting time and compressive strength (29.6 MPa, 28 d), and its hydration products are calcium silicate hydrate (CSH) gel, calcium aluminum silicate hydrates (CASH) gel and Friedel’s salt. CaCl2 in SR plays a main role in hydration products generation and high compressive strength of SR- activated GGBS pastes.

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“…Components like calcium oxide and aluminum oxide contained in AR can be the framework alongside with the hydration products generated from the hydration reaction, which will enhance the strength of the specimen. Based on the experimental investigations, Yan et al [11] reported that the addition of alkaline residue in the contaminated soils could significantly reduce the leachability of Pb 2+ to an acceptable level and the removal efficiency strongly depended on the pH value in the soils. e adsorption characteristics of the alkaline residue on heavy metal ions were also investigated by Cao et al [12], in which the adsorption capacity of alkaline residue was confirmed to be susceptible to the pH, temperature, and the initial concentration of heavy metal ions in the soils.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Engineering Properties of Solidified/Stabilized Pb‐Contaminated Soil Based on Alkaline Residue

Zha

Pan

et al. 2018

Advances in Civil Engineering

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Solidification/stabilization (S/S) has been considered as one of the most effective techniques for remediation of the heavy metal-contaminated sites. Among various binders adopted in S/S, alkaline residue (AR) could be considered as a new binder to treat heavy metal-contaminated soil due to its strong adsorptive capacity for heavy metal ions. So in this paper, the strength, leaching, and microstructure characteristics of the solidified/stabilized Pb-contaminated soil by using alkaline residue are systematically investigated. Test results present that the unconfined compressive strength (UCS) of the treated soil will increase, while the leached Pb2+ concentration will decrease, with the increase of the alkaline residue content in the specimen. The UCS increases significantly with the curing time increasing during the initial 28 days, after which the UCS of the specimen becomes stable. The leached Pb2+ concentration decreases significantly at the initial 28 days followed by a stable trend with curing time increasing. The UCS decreases and the leached Pb2+ concentration increases with the increase of the initial Pb2+ concentration in the specimen. The microstructural analysis performed by scanning electron microscope (SEM) showed that the increase of the alkaline residue content and curing time will result in more hydration products and densified microstructure, which could effectively improve the engineering properties of the specimen.

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Utilization of phosphorus loaded alkaline residue to immobilize lead in a shooting range soil

Cited by 40 publications

References 32 publications

Slow pyrolyzed biochars from crop residues for soil metal(loid) immobilization and microbial community abundance in contaminated agricultural soils

Slow pyrolyzed biochars from crop residues for soil metal(loid) immobilization and microbial community abundance in contaminated agricultural soils

Effect of Soda Residue Addition and Its Chemical Composition on Physical Properties and Hydration Products of Soda Residue-Activated Slag Cementitious Materials

Investigations on Engineering Properties of Solidified/Stabilized Pb‐Contaminated Soil Based on Alkaline Residue

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