Acid rain leaching behavior of Zn-contaminated soils solidified/stabilized using cement–soda residue

Zha, Fusheng; Liu, Congmin; Kang, Bo; Yang, Xiaoqing; Zhou, Yang; Yang, Chunli

doi:10.1016/j.chemosphere.2021.130916

Cited by 33 publications

(5 citation statements)

References 40 publications

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“…Therefore, in this study, the simulation of acidic water with distilled water using 0.1 mol L −1 HCl or 0.1 mol L −1 NaOH to buffer (Na 2 HPO 4 ·12H 2 O:NaH 2 PO 4 ·2H 2 O) the pH to 5–5.5 (ref. 53 and 64) was investigated. The experiments were carried out after 90 days of incubation by pouring roughly 200 mL of simulated acidic water over each pot every 30 days (first leaching), 60 days (second leaching), and 90 days (third leaching).…”

Section: Methodsmentioning

confidence: 99%

Towards engineering mitigation of leaching of Cd and Pb in co-contaminated soils using metal oxide-based aerogel composites and biochar

Sanaei,

Sarmadi,

Dehghani

et al. 2023

Environ. Sci.: Processes Impacts

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Section: Methodsmentioning

confidence: 99%

Towards engineering mitigation of leaching of Cd and Pb in co-contaminated soils using metal oxide-based aerogel composites and biochar

Sanaei,

Sarmadi,

Dehghani

et al. 2023

Environ. Sci.: Processes Impacts

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“…3). During the curing process, cement hydration produces hydration products, such as hydrated calcium silicate (CSH), calcium aluminate hydrate (CAH), and Ca(OH) 2 , which combine the soil particles and increase the strength of the total soil (Li et al, 2019;Zha et al, 2021). Moreover, in the application of Cement-soda residue composites as curing agents, the soda residue could provide a stable alkaline environment in the S/S process (Fig.…”

Section: Solidi Cation Mechanismmentioning

confidence: 99%

“…Zha et al (2021) concluded that cement and soda residue (CSR) has been proven to be an effective binder for treating heavy metal contaminated soils, and its durability is its most important property Zha et al (2021). investigated the leaching behavior of the consolidated/stabilized CSR under acid rain conditions.…”

mentioning

confidence: 99%

Investigation on stabilization/solidification characteristics of lead-contaminated soil using innovative composite model of cement and soda residue

Zuo

Wang

et al. 2022

Environ Earth Sci

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The cement solidi cation/stabilization method of heavy metal contaminated soils has been promoted in engineering practice and applied on a large scale for site remediation, but it still reveals some scienti c problems in the current complex and variable global extreme climate. To solve these problems and explore cement-based soil remediation technology, this study used the waste soda residue produced in large quantities in the "ammonia-soda process" as a composite additive, and established an innovative composite model of cement and soda residue by adding different ratios, which was applied to the remediation experiments of lead-contaminated soil. The innovative composite model solidi cation/stabilization of cement and soda residue for uncon ned compressive strength and toxic leaching properties under different soil environmental conditions were investigated. Moreover, curing and leaching mechanisms are discussed, and future industrial practice was evaluated. The results showed that the addition of soda residue improved the early (20 days) uncon ned compressive strength (UCS) of the composite curing agent for lead-contaminated soil by an average of 23.1% Mpa.When the percentage of soda residue composite was 40%, the UCS strength was 0.96 Mpa, which reached the maximum. The concentration of Pb 2+ in the leachate of the cement-soda residue composite curing agent was greatly reduced (average 3.28 times) compared with that of a single cement in the same situation, with an average leached Pb 2+ concentration of 1.87 mg•L -1 . This indicates that the addition of alkali residue improved the curing effect. The curing mechanism was divided into four steps, mainly a complex physicochemical reaction between the cement-soda residue composite and soil particles. The leaching mechanism of cement-soda residue to aqueous solution is mainly the consumption of acid ions by alkaline substances. This study will provide scienti c data to support potential lead-containing soil in site remediation technologies and future large-scale engineering applications. Highlights 1. The cement and soda residue were compounded in a direct homogeneous mixture.2. The UCS, TCL, curing and leaching mechanisms were researched and discussed.3. The doping ratios of S b /S d =20% and S s /S b =40% have the best curing effect. 4. cement-soda residue composite reduces the leaching of Pb 2+ by 3.28 times, i.e. 1.87 mg•L -1 . 5. The curing mechanism was divided into four steps, mainly a complex physicochemical reaction.

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“…To address the drawback that it is difficult to assess the long-term environmental risk of heavy metals retained in soil [8], scholars have studied the long-term stability of S/S heavy metals by soil column leaching experiments [9] and quantitative accelerated aging experiments [10]. For example, Zha simulated 3 years of acid rain on cement-alkali slag cured/stabilized Zn-contaminated soil by soil column leaching experiments and found that the Zn concentration in the filtrate always met the requirements (<1 mg/L) [11]. Shen used the accelerated aging method and found that the stabilization effect decreased when the TCLP leaching concentration of Pb and Cd increased over a simulated acid rain period of 52 to 104 years [6].…”

Section: Introductionmentioning

confidence: 99%

Groundwater Risk Assessment Based on DRASTIC and Special Vulnerability of Solidified/Stabilized Heavy-Metal-Contaminated Sites

Wei

Chi

2023

Sustainability

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Solidification/stabilization technology is commonly used in the remediation of heavy-metal-contaminated sites, which reduces the leaching capacity of heavy metals, but the total amount of heavy metals in the soil is not reduced, there is still a risk of heavy metal re-release and contamination of groundwater, and the risk of groundwater contamination of solidified/stabilized heavy-metal-contaminated sites needs to be assessed. Through the analysis of the system structure of solidified/stabilized heavy-metal-contaminated sites, combined with the integration method of pollution sources—the vadose zone-aquifer, based on the DRASTIC model and the special vulnerability of the solidification/stabilization site, a groundwater pollution risk assessment index system including 4 influencing factors such as site hazard, pollutant hazard, aquifer vulnerability, and natural conditions and a total of 18 evaluation indexes was constructed. Each evaluation index was graded and assigned a scoring value combined with the Analytic Hierarchy Process (AHP) to calculate index weights. The comprehensive weights of site hazard, contaminant stability, aquifer vulnerability, and natural conditions were 0.1894, 0.3508, 0.3508, and 0.1090, respectively. The isometric method was used to classify the pollution risk into five risk levels (very low risk [0, 2), low risk [2, 4), medium risk [4, 6), high risk [6, 8), and very high risk [8, 10]), and a groundwater comprehensive index pollution risk assessment model was established. The model was applied to the actual site. The results showed that under the scenario of direct landfill of remediated soil, the comprehensive indexes of groundwater pollution risk for As and Cd were 4.55 and 4.58, respectively, both of which were medium risk. When the surrounding protective measures were supplemented, the comprehensive indexes of groundwater pollution risk for As and Cd were 3.98 and 4.02, respectively. Cd remained as medium risk and As as low risk. In both scenarios, the combined groundwater contamination risk index of Cd was greater than that of As because the contaminant stability of As was higher than that of Cd. The average percentage of aquifer vulnerability score reached 45.50%, which was higher than the weight of site inherent vulnerability of 35.08%, indicating that the original site hydrogeological conditions are fragile, groundwater is vulnerable to contamination, and the in situ landfill solidification/stabilization of soil is at risk. In order to further reduce the risk, the topographic slope was increased, thereby increasing the surface drainage capacity, which reduced the combined groundwater contamination risk index for As and Cd to 3.94 and 3.90, both of which were low risk. This study provides a new method for assessing the risk of groundwater contamination at solidified/stabilized heavy-metal-contaminated sites. It also has reference significance for selecting solidification/stabilization remediation parameters

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Acid rain leaching behavior of Zn-contaminated soils solidified/stabilized using cement–soda residue

Cited by 33 publications

References 40 publications

Towards engineering mitigation of leaching of Cd and Pb in co-contaminated soils using metal oxide-based aerogel composites and biochar

Towards engineering mitigation of leaching of Cd and Pb in co-contaminated soils using metal oxide-based aerogel composites and biochar

Investigation on stabilization/solidification characteristics of lead-contaminated soil using innovative composite model of cement and soda residue

Groundwater Risk Assessment Based on DRASTIC and Special Vulnerability of Solidified/Stabilized Heavy-Metal-Contaminated Sites

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